60results about How to "Improve high temperature diffusion ability" patented technology

The invention discloses copper-zirconium-cobalt modified austenitic stainless steel and a processing and heat treatment method thereof. Alloy elements comprise, by mass percent, not larger than 0.03 of C, 8.0-12.0 of Ni, 18.0-20.0 of Cr, not larger than 0.53 of Zr, 0.2-0.8 of Cu, 0.1-0.5 of Co, not larger than 2.0 of Mn, not larger than 1.0 of Si, not larger than 0.035 of P, not larger than 0.030of S and the balance Fe, wherein 7.59*C<=Zr<=7.59*C+0.3. Through thermal deformation cogging and cold deformation, ZrC is crushed and dispersed, and grains are coarsened after high-temperature solution treatment. Under the oxygen introduction condition, the density of the corrosion current in an H2SO4 electrolyte of 0.5 mol / L ranges from 1.12 microamperes / cm<2> to 1.94 microamperes / cm<2>, whereinthe H2SO4 electrolyte includes 5*10-6F- at the temperature being 80 DEG C, and the copper-zirconium-cobalt modified austenitic stainless steel is equivalent to a stainless steel bipolar plate materialsubjected to surface coating. The advantages of low hardness and high extensibility are achieved, and forming of a bipolar plate runner is facilitated.

The invention discloses copper-hafnium-cobalt modified stainless steel and processing and heat treatment method thereof. Alloy elements comprise, by mass percent, not larger than 0.03 of C, 12.0-15.0of Ni, 16.0-18.0 of Cr, 2.0-3.0 of Mo, not larger than 0.74 of Hf, 0.2-0.8 of Cu, 0.1-0.5 of Co, not larger than 2.0 of Mn, not larger than 1.0 of Si, not larger than 0.035 of P, not larger than 0.030of S and the balance Fe, wherein 14.86*C<=Hf<=14.86*C+0.3. Through thermal deformation cogging and cold deformation, HfC is crushed and dispersed, and grains are coarsened after high-temperature solution treatment. The density of the corrosion current in 0.5 mol / L of an H2SO4 electrolyte ranges from 1.26 microamperes / cm2 to 1.82 microamperes / cm2, wherein the H2SO4 electrolyte includes 5*10-6F- atthe temperature being 80 DEG C under the oxygen introduction condition, and it is equivalent to a stainless steel bipolar plate material subjected to surface coating. The advantages of low hardness and high extensibility are achieved, and forming of a bipolar plate runner is facilitated.

The invention discloses copper, zirconium and cobalt containing high-corrosion-resistance stainless steel and a processing and heat treatment method thereof. Alloy elements comprise, by mass percent,not larger than 0.08 of C, 11.0-15.0 of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mo, not larger than 0.60 of Zr, 0.2-0.8 of Cu, 0.1-0.5 of Co, not larger than 2.0 of Mn, not larger than 1.0 of Si, not larger than 0.035 of P, not larger than 0.030 of S and the balance Fe, wherein 7.59*(C-0.01)<=Zr<=7.59*C. Through thermal deformation cogging and cold deformation, ZrC is crushed and dispersed, and grains arecoarsened after high-temperature solution treatment. The density of the corrosion current in 0.5 mol / L of an H2SO4 electrolyte ranges from 1.17 microamperes / cm2 to 2.07 microamperes / cm2, wherein theH2SO4 electrolyte includes 5*10-6F- at the temperature being 80 DEG C under the oxygen introduction condition, and it is equivalent to a stainless steel bipolar plate material subjected to surface coating. The advantages of low hardness and high extensibility are achieved, and forming of a bipolar plate runner is facilitated.

The invention discloses a Cu-Hf-containing corrosion-resistant reinforced austenitic stainless steel and a preparation method thereof. The austenitic stainless steel is prepared from alloy elements including, by mass, less than or equal to 0.07 of C, 8.0-10.0 of Ni, 17.0-19.0 of Cr, less than or equal to 1.04 of Hf, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S and the balance Fe, wherein Hf is more than or equal to 14.86*(C-0.01) and is less than or equal to 14.86*C. After alloy smelting, through thermal deformation cogging and cold deformation, HfC is fully broken and distributed in a dispersed manner, and coarse austenitic grains are obtained through high-temperature solution treatment.The density of alloy corrosion current in a H2SO4 electrolyte which contains 5*10<-6>F<-> and has the concentration being 0.5 mol / L at 80 DEG C in hydrogen ranges from 10.8 mu A / cm<2> to 12.5 mu A / cm<2>, compared with 304 stainless steel, the stainless steel has the advantage that the corrosion rate is substantially reduced, and the mechanical property is slightly better than that of the 304 stainless steel.

The invention discloses high corrosion resistant austenitic stainless steel containing copper-niobium-cobalt and a processing and heat treatment method of the austenitic stainless steel. Alloy elements comprise, by mass percentage, smaller than or equal to 0.08 C, 10.0-14.0 Ni, 16.0-18.5 Cr, 2.0-3.0 Mo, smaller than or equal to 0.61 Nb, 0.2-0.8 Cu, 0.1-0.5 Co, smaller than or equal to 2.0 Mn, smaller than or equal to 1.0 Si, smaller than or equal to 0.035 P, smaller than or equal to 0.030 S, and the balance Fe, wherein 7.73x(C-0.01)<=Nb<=7.73xC. Due to thermal deformation cogging and cold deformation, NbC breaking and dispersion are achieved, and grain coarsening is achieved after high temperature solid solution treatment. Under the oxygen introducing condition, the corroding current density in a 0.5 mol / L H2SO4 electrolyte containing 5x10<-6>F<-> at 80 DEG C is 1.68-3.70 muA / cm<2>, and is equivalent to that of a stainless steel bipolar plate material subjected to surface coating. Thehigh corrosion resistant austenitic stainless steel containing copper-niobium-cobalt has the beneficial effects of low hardness and high extending, and forming of a bipolar plate flow channel is facilitated.

The invention discloses copper and titanium contained high-strength and high-corrosion resistance stainless steel and a preparation method thereof. Alloy elements include 0.08 or less of C, 11.0-15.0of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mi, 0.32 or less of Ti, 0.2-0.8 of Cu, 2.0 or less of Mn, 1.0 or less of Si, 0.035 or less of P, 0.030 or less of S and the balance Fe, wherein 3.98 x (C-0.01)<=Ti<=3.98 x C. After an alloy is smelted, through thermal deformation cogging and cold deformation, TiC is sufficiently broken and dispersed and distributed, and through high-temperature solution treatment, thick and large austenite grains are obtained. Under the hydrogen feeding condition, the alloy corrosion current in a 0.5 mol / L H2SO4 electrolyte containing 5 x 10<-6>F<-> at the temperature of 80 DEG C is 4.6 mu A / cm<2>-14.3 mu A / cm<2>, compared with stainless steel 317L, the corrosion rate is greatly reduced, and the mechanical performance is slightly superior to that of the stainless steel317L.

Disclosed are Cu and Nb containing high-strength and high-corrosion-resistance stainless steel and a preparation method thereof. The Cu and Nb containing high-strength and high-corrosion-resistance stainless steel is prepared from the alloy elements of less than or equal to 0.08 of C, 10.0-14.0 of Ni, 16.0-18.5 of Cr, 2.0-3.0 of Mo, less than or equal to 0.61 of Nb, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein Nb is greater than or equal to 7.73*(C-0.01) and smaller than or equal to 7.73*C. After alloy smelting, niobium carbide (NbC) is fully crushed and dispersed through thermal deformation cogging and cold deformation, and coarse austenite grains are obtained by high-temperature solution treatment. The alloy corrosion current in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under hydrogen conditionsis 12.9-15.7 [mu]A / cm<2>. Compared with 316L stainless steel, the corrosion rate is greatly reduced while the mechanical property is slightly better than that of the 316L stainless steel.

Disclosed are Cu and Hf containing high-strength and high-corrosion-resistance stainless steel and a preparation method thereof. The Cu and Hf containing high-strength and high-corrosion-resistance stainless steel is prepared from the alloy elements of less than or equal to 0.08 of C, 11.0-15.0 of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mo, less than or equal to 1.18 of Hf, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein Hf is greater than or equal to 14.86*(C-0.01) and smaller than or equal to 14.86*C. After alloy smelting, hafnium carbide (HfC) is fully crushed and dispersed through thermal deformation cogging and cold deformation, and coarse austenite grains are obtained by high-temperature solution treatment. The alloy corrosion current in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under hydrogen conditions is 6.6-14.2 [mu]A / cm<2>. Compared with 317L stainless steel, the corrosion rate is greatly reduced while the mechanical property is slightly better than that of the 317L stainless steel.

Disclosed are Cu and Ti containing high-strength and high-corrosion-resistance austenitic stainless steel and a preparation method thereof. The Cu and Ti containing high-strength and high-corrosion-resistance austenitic stainless steel is prepared from the alloy elements of less than or equal to 0.08 of C, 10.0-14.0 of Ni, 16.0-18.5 of Cr, 2.0-3.0 of Mo, less than or equal to 0.32 of Ti, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein Ti is greater than or equal to 3.98*(C-0.01) and smaller than or equal to 3.98*C. After alloy smelting, titanium carbide (TiC) is fully crushed and dispersed through thermal deformation cogging and cold deformation, and coarse austenite grains are obtained by high-temperature solution treatment. The alloy corrosion current in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under hydrogen conditions is 6.9-9.8 [mu]A / cm<2>. Compared with 316L stainless steel, the corrosion rate is greatly reduced while the mechanical property is slightly better than that of the 316L stainless steel.

Disclosed are Cu-W reinforced anti-corrosion austenitic stainless steel and a preparation method thereof. The Cu-W reinforced anti-corrosion austenitic stainless steel is prepared from the alloy elements of less than or equal to 0.03 of C, 12.0-15.0 of Ni, 16.0-18.0 of Cr, 2.0-3.0 of Mo, less than or equal to 0.76 of W, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein W is greater than or equal to 15.3*C and smaller than or equal to 15.3*C+0.3. After alloy smelting, tungsten carbide (WC) is fully crushed and dispersed through thermal deformation cogging and cold deformation, and coarse austenite grains are obtained by high-temperature solution treatment. The alloycorrosion current in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under hydrogen conditions is 2.6-4.9 [mu]A / cm<2>. Compared with 316L stainless steel, the corrosion rate is greatly reduced while the mechanical property is slightly better than that of the 316L stainless steel.

The invention discloses copper and vanadium anti-corrosion enhanced austenitic stainless steel and a preparation method thereof. Alloy elements include 0.07 or less of C, 8.0-10.0 of Ni, 17.0-19.0 ofCr, 0.30 or less of V, 0.2-0.8 of Cu, 2.0 or less of Mn, 1.0 or less of Si, 0.035 or less of P, 0.030 or less of S and the balance Fe, wherein 4.24 x (C-0.01)<=V<=4.24 x C. After an alloy is smelted,through thermal deformation cogging and cold deformation, VC is sufficiently broken and dispersed and distributed, and through high-temperature solution treatment, thick and large austenite grains areobtained. Under the hydrogen feeding condition, the alloy corrosion current in a 0.5 mol / L H2SO4 electrolyte containing 5 x 10<-6>F<-> at the temperature of 80 DEG C is 17.8 mu A / cm<2>-23.5 mu A / cm<2>, compared with stainless steel 304, the corrosion rate is greatly reduced, and the mechanical performance is slightly superior to that of the stainless steel 304.

The invention provides copper-vanadium-cobalt modified austenitic stainless steel and a processing and heat treatment method thereof. The modified austenitic stainless steel is prepared from, by mass,smaller than or equal to 0.03% of C, 8.0%-12.0% of Ni, 18.0%-20.0% of Cr, smaller than or equal to 0.43% of V, 0.2%-0.8% of Cu, 0.1%-0.5% of Co, smaller than or equal to 2.0% of Mn, smaller than or equal to 1.0% of Si, smaller than or equal to 0.035% of P, smaller than or equal to 0.030% of S and the balance Fe, wherein V is larger than or equal to 4.24*C and smaller than or equal to 4.24*C+0.3.The processing and heat treatment method comprises the steps of hot-deformation cogging, cold deformation, VC crushing and dispersing, high temperature solution treatment and grain coarsening. Under the oxygen feeding condition, the corrosion current density in a 0.5 mol / L H2SO4 electrolyte containing 5*10<-6> F<-1> at 80 DEG C ranges from 1.09 microamperes / cm<2> to 1.78 microamperes / cm<2>, and the corrosion current density is equal to that of a stainless steel bipolar plate material with a surface coating. The austenitic stainless steel has the advantages of being low in hardness and high inextension, and forming of a bipolar plate runner is facilitated.

The invention discloses copper and zirconium containing high-strength and high-corrosion-resistance stainless steel and a preparing method thereof. Alloy elements include smaller than or equal to 0.08of C, 11.0-15.0 of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mo, smaller than or equal to 0.60 of Zr, 0.2-0.8 of Cu, smaller than or equal to 2.0 of Mn, smaller than or equal to 1.0 of Si, smaller than or equal to 0.035 of P, smaller than or equal to 0.030 of S and the balance Fe, wherein 7.59 x (C-0.01) <=Zr<=7.59 x C. After alloy smelting, through heat deformation cogging and cold deformation, sufficientZrC crushing and dispersion distribution are conducted, and rough and big austenite grains are obtained after high-temperature solid solution treatment. Under the hydrogen inflation condition, the alloy corrosion current in a 0.5 mol / L H2SO4 electrolyte containing 5 x 10<-6>F<-> at the temperature of 80 DEG C is 5.8-12.2 mu A / cm<2>, compared with 317 L stainless steel, the corrosion rate is greatly reduced, and the mechanical performance is slightly superior to that of the317 L stainless steel.

Disclosed are Cu-Ti-Co high-corrosion-resistance stainless steel and processing and thermal treatment methods thereof. The Cu-Ti-Co high-corrosion-resistance stainless steel is prepared from the alloyelements of less than or equal to 0.08 of C, 11.0-15.0 of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mo, less than or equal to 0.32 of Ti, 0.2-0.8 of Cu, 0.1-0.5 of Co, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein Ti is greater than or equal to 3.98*(C-0.01) and smaller than or equal to 3.98*C. Titanium carbide (VC) is crushed and dispersed through thermal deformation cogging and cold deformation, and grains are coarsened by high-temperature solution treatment. The corrosion current density in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under oxygen conditions is 1.08-3.01 [mu]A / cm<2>, and the corrosion current density is equivalent with that of a stainless steel bipolar plate material with a surface coating. The Cu-Ti-Co high-corrosion-resistance stainless steel has the characteristics of low hardness and high elongation,and is beneficial for forming of a bipolar plate runner.

The invention discloses Cu-W-Co-containing high-corrosion-resistant austenitic stainless steel and a processing and heat treatment method thereof. The alloy comprises the elements, by mass percentage,of less than or equal to 0.08 of C, 10.0-14.0 of Ni, 16.0-18.5 of Cr, 2.0-3.0 of Mo, less than or equal to 1.22 of W, 0.2-0.8 of Cu, 0.1-0.5 of Co, less than or equal to 2.0 of Mn, less than or equalto 0.1 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein the W is greater than or equal to 15.3*(C-0.01) and smaller than or equal to 15.3*C. After thermal deformation cogging and cold deformation, WC is crushed and dispersed, and grains are coarsened after a high-temperature solid solution treatment. With the temperature of 80 DEG C and underan aeration condition, corrosion current density in a 0.5 mol / L H2SO4 electrolyte including 5*10-6F- is 1.74-2.17 microamps per square centimeter, which is equivalent to a stainless steel bipolar plate material subjected to a surface coating. The Cu-W-Co-containing high-corrosion-resistant austenitic stainless steel has the characteristics of low hardness and high extension, and can facilitate theformation of a bipolar plate flow channel.

The invention discloses copper and vanadium contained high-strength and high-corrosion resistance stainless steel and a preparation method thereof. Alloy elements include 0.08 or less of C, 11.0-15.0of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mo, 0.34 or less of V, 0.2-0.8 of Cu, 2.0 or less of Mn, 1.0 or less of Si, 0.035 or less of P, 0.030 or less of S and the balance Fe, wherein the content of the 4.24 x (C-0.01) <=V<= 4.24 x C. After an alloy is smelted, through thermal deformation cogging and cold deformation, VC is sufficiently broken and dispersed and distributed, and through high-temperaturesolution treatment, thick and large austenite grains are obtained. Under the hydrogen feeding condition, the alloy corrosion current in a 0.5 mol / L H2SO4 electrolyte containing 5 x 10<-6>F<-> at the temperature of 80 DEG C is 6.9 mu A / cm<2>-15.5 mu A / cm<2>, compared with stainless steel 317L, the corrosion rate is greatly reduced, and the mechanical performance is slightly superior to that of the stainless steel 317L.

The invention provides copper-titanium-cobalt modified austenitic stainless steel and a processing and heat treatment method thereof. The copper-titanium-cobalt modified austenitic stainless steel comprises, by mass, no less than 0.03% of C, 8.0%-12.0% of Ni, 18.0%-20.0% of Cr, no less than 0.42% of Ti, 0.2%-0.8% of Cu, 0.1%-0.5% of Co, no less than 2.0% of Mn, no less than 1.0% of Si, no less than 0.035% of P, no less than 0.030% of S, and the balance Fe, wherein 3.98*C<=Ti<=3.98*C+0.3. Thermal-deformation blooming, cold deformation, TiC crushing and dispersion, high-temperature solution treatment, and grain coarsening are sequentially conducted. The corrosion current density of the copper-titanium-cobalt modified austenitic stainless steel in an H2SO4 electrolyte having a concentration of 0.5mol / L and containing 5*10<-6>F<-> at the temperature of 80 DEG C under an oxygen condition is 1.89-2.39[mu]A / cm<2> and is equivalent to that of a stainless steel bipolar plate with a coating on the surface. The copper-titanium-cobalt modified austenitic stainless steel has the characteristics of low hardness and high ductility, and formation of a passage of the bipolar plate is facilitated.

Disclosed are Cu-W anti-corrosion austenitic stainless steel and a preparation method thereof. The Cu-W reinforced anti-corrosion austenitic stainless steel is prepared from the alloy elements of lessthan or equal to 0.03 of C, 8.0-12.0 of Ni, 18.0-20.0 of Cr, less than or equal to 0.76 of W, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein W is greater than or equal to 15.3*C and smaller than or equal to 15.3*C+0.3. After alloy smelting, tungsten carbide (WC) is fully crushed and dispersed through thermal deformation cogging and cold deformation, and coarse austenite grains are obtained by high-temperature solution treatment. The alloy corrosion current in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under hydrogen conditions is 6.5-10.4 [mu]A / cm<2>. Compared with 304L stainless steel, the corrosion rate is greatly reduced while the mechanical property is slightly better than that of the 304L stainless steel.

The invention discloses copper and titanium enhanced anti-corrosion austenitic stainless steel and a preparation method thereof. Alloy elements include 0.03 or less of C, 12.0-15.0 of Ni, 16.0-18.0 ofCr, 2.0-3.0 of Mo, 0.42 or less of Ti, 0.2-0.8 of Cu, 2.0 or less of Mn, 1.0 or less of Si, 0.035 or less of P, 0.030 or less of S and the balance Fe, wherein 3.98 x C<=Ti<=3.98 x C + 0.3. After an alloy is smelted, through thermal deformation cogging and cold deformation, TiC is sufficiently broken and dispersed and distributed, and through high-temperature solution treatment, thick and large austenite grains are obtained. Under the hydrogen feeding condition, the alloy corrosion current in a 0.5 mol / L H2SO4 electrolyte containing 5 x 10<-6>F<-> at the temperature of 80 DEG C is 5.9 mu A / cm<2>-7.9 mu A / cm<2>, compared with stainless steel 316L, the corrosion rate is greatly reduced, and the mechanical performance is slightly superior to that of the stainless steel 316L.

The invention discloses copper-tantalum corrosion-resistant reinforced austenitic stainless steel and a preparation method thereof. The austenitic stainless steel comprises the alloy elements of, by content, less than or equal to 0.07% of C, 8.0% to 10.0% of Ni, 17.0 to 19.0% of Cr, less than or equal to 1.05% of Ta, 0.2-0.8% of Cu, less than or equal to 2.0% of Mn, less than or equal to 1.0% of Si, less than or equal to 0.035% of P, less than or equal to 0.030% of S and the balance Fe, wherein Ta is greater than or equal to 15.06*(C-0.01) and smaller than or equal to 15.06*C. After the alloyis smelted, heat deformation cogging and cold deformation are carried out so that TaC can be fully crushed and is distributed in a dispersed mode, and coarse austenite grains are obtained through high-temperature solid solution treatment; and the alloy corrosion current in a 0.5 mol / L of H2SO4 electrolyte containing 5*10<-6> F<-> at the temperature of 80 DEG C under the hydrogen-passing conditionis 11.2-19.2 micro A / cm <2>; and compared with 304 stainless steel, the corrosion rate is greatly reduced, and the mechanical property is slightly better than that of the 304 stainless steel.

The invention discloses copper-tantalum austenitic stainless steel and a preparation method thereof. Alloy comprises the elements of 0-0.03 of C, 8.0-12.0 of Ni, 18.0-20.0 of Cr, 0-0.75 of Ta, 0.2-0.8of Cu, 0-2.0 of Mn, 0-1.0 of Si, 0-0.035 of P, 0-0.030 of S and the balance Fe, wherein the Ta is larger than or equal to 15.06*C and smaller than or equal to 15.06*C+0.3. After the alloy is smelted,thermal deformation cogging and cold deformation are conducted, TaC is sufficiently broken and diffused, and through high temperature solution treatment, thick austenite grains are obtained. Under the hydrogen injection condition, the alloy corrosion current in 0.5mol / L of H2SO4 electrolyte containing 5*10<-6>F<-> at the temperature of 80 DEG C is 10.3-14.5[mu]A / cm<2>, compared 304 stainless steel, the corrosion rate of the austenitic stainless steel is substantially reduced, and the mechanical property of the austenitic stainless steel is slightly better than that of the 304 stainless steel.

Disclosed are Cu and Ta containing high-strength and high-corrosion-resistance stainless steel and a preparation method thereof. The Cu and Ta containing high-strength and high-corrosion-resistance stainless steel is prepared from the alloy elements of less than or equal to 0.08 of C, 11.0-15.0 of Ni, 18.0-20.0 of Cr, 3.0-4.0 of Mo, less than or equal to 1.20 of Ta, 0.2-0.8 of Cu, less than or equal to 2.0 of Mn, less than or equal to 1.0 of Si, less than or equal to 0.035 of P, less than or equal to 0.030 of S, and the balance Fe, wherein Ta is greater than or equal to 15.06*(C-0.01) and smaller than or equal to 15.06*C. After alloy smelting, tantalum carbide (TaC) is fully crushed and dispersed through thermal deformation cogging and cold deformation, and coarse austenite grains are obtained by high-temperature solution treatment. The alloy corrosion current in an H2SO4 electrolyte with the molar concentration of 0.5 mol / L containing 5*10<-6>F minus at 80 DEG C under hydrogen conditions is 7.9-13.2 [mu]A / cm<2>. Compared with 317L stainless steel, the corrosion rate is greatly reduced while the mechanical property is slightly better than that of the 317L stainless steel.

The invention discloses copper hafnium cobalt corrosion-resistant austenitic stainless steel and a processing and heat treatment method thereof. The austenitic stainless steel is prepared from, by mass, smaller than or equal to 0.07% of C, 8.0%-10.0% of Ni, 17.0%-19.0% of Cr, smaller than or equal to 1.04% of Hf, 0.2%-0.8% of Cu, 0.1%-0.5% of Co, smaller than or equal to 2.0% of Mn, smaller than or equal to 1.0% of Si, smaller than or equal to 0.035% of P, smaller than or equal to 0.030% of S and the balance Fe, wherein Hf is larger than or equal to 14.86*(C-0.01) and smaller than or equal to14.86*C. The processing and heat treatment method comprises the steps of hot-deformation cogging, cold deformation, HfC crushing and dispersing, high temperature solution treatment and grain coarsening. Under the oxygen feeding condition, the corrosion current density in a 0.5 mol / L H2SO4 electrolyte containing 5*10<-6> F<-1> at 80 DEG C ranges from 1.49 microamperes / cm<2> to 2.01 microamperes / cm<2>, and the corrosion current density is equal to that of a stainless steel bipolar plate material with a surface coating. The austenitic stainless steel has the advantages of being low in hardness and high in extension, and forming of a bipolar plate runner is facilitated.

The invention discloses copper and niobium reinforced corrosion-resistant austenitic stainless steel and a preparation method thereof. Alloy elements comprise smaller than or equal to 0.03 C, 12.0-15.0 Ni, 16.0-18.0 Cr, 2.0-3.0 Mo, smaller than or equal to 0.53 Nb, 0.2-0.8 Cu, smaller than or equal to 2.0 Mn, smaller than or equal to 1.0 Si, smaller than or equal to 0.035 P, smaller than or equalto 0.030 S, and the balance Fe, wherein 7.73xC<=Nb<=7.73xC+0.3. After alloy smelting, due to thermal deformation cogging and cold deformation, NbC can be sufficiently broken and distributed in a dispersed manner, and due to high temperature solid solution treatment, coarse and large austenite grains are obtained. Under the hydrogen introducing condition, the alloy corroding current in a 0.5 mol / LH2SO4 electrolyte containing 5x10<-6>F<-> at 80 DEG C is 7.4-9.9 muA / cm<2>, compared with 316L stainless steel, the corroding speed is substantially lowered, and the mechanical performance is slightlysuperior to that of the 316L stainless steel.

The invention discloses high strength and high corrosion resistance stainless steel containing copper and niobium and a preparation method of the stainless steel. Alloy elements comprise smaller thanor equal to 0.08 C, 11.0-15.0 Ni, 18.0-20.0 Cr, 3.0-4.0 Mo, smaller than or equal to 0.61 Nb, 0.2-0.8 Cu, smaller than or equal to 2.0 Mn, smaller than or equal to 1.0 Si, smaller than or equal to 0.035 P, smaller than or equal to 0.030 S, and the balance Fe, wherein 7.73x(C-0.01)<=Nb<=7.73xC. After alloy smelting, due to thermal deformation cogging and cold deformation, NbC can be sufficiently broken and distributed in a dispersed manner, and due to high temperature solid solution treatment, coarse and large austenite grains are obtained. Under the hydrogen introducing condition, the alloy corroding current in a 0.5 mol / L H2SO4 electrolyte containing 5x10<-6>F<-> at 80 DEG C is 7.4-13.2 muA / cm<2>, compared with 317L stainless steel, the corroding speed is substantially lowered, and the mechanical performance is slightly superior to that of the 317L stainless steel.

The invention provides copper-tungsten-cobalt modified austenitic stainless steel and a processing and heat treatment method thereof. The austenitic stainless steel is prepared from, by mass, smallerthan or equal to 0.03% of C, 8.0%-10.0% of Ni, 18.0%-20.0% of Cr, smaller than or equal to 0.76% of W, 0.2%-0.8% of Cu, 0.1%-0.5% of Co, smaller than or equal to 2.0% of Mn, smaller than or equal to 1.0% of Si, smaller than or equal to 0.035% of P, smaller than or equal to 0.030% of S and the balance Fe, wherein W is larger than or equal to 15.3*C and smaller than or equal to 15.3*C+0.3. The processing and heat treatment method comprises the steps of hot-deformation cogging, cold deformation, WC crushing and dispersing, high temperature solution treatment and grain coarsening. Under the oxygenfeeding condition, the corrosion current density in a 0.5 mol / L H2SO4 electrolyte containing 5*10<-6> F<-1> at 80 DEG C ranges from 1.09 microamperes / cm<2> to 2.13 microamperes / cm<2>, and the corrosion current density is equal to that of a stainless steel bipolar plate material with a surface coating. The austenitic stainless steel has the advantages of being low in hardness and high in extension, and forming of a bipolar plate runner is facilitated.

The invention discloses copper titanium cobalt-contained high-corrosion-resistance austenitic stainless steel and a machining and heat treatment method thereof. An alloy comprises the following elements in percentage by mass: C not more than 0.08, 10.0-14.0 of Ni, 16.0-18.5 of Cr, 2.0-3.0 of Mo, Ti not more than 0.32, 0.2-0.8 of Cu, 0.1-0.5 of Co, Mn not more than 2.0, Si not more than 1.0, P notmore than 0.035, S not more than 0.030, and the balance of Fe, wherein Ti is not more than 3.98*C and not less than 3.98*(C-0.01). Through thermal deformation cogging and cold deformation, TiC is crushed and dispersed; and after high-temperature solid solution treatment, grains are coarsened. Under the oxygen introduction condition, the corrosion current density in H2SO4 electrolyte of 0.5 mol / L containing 5*10-6F- is 1.65-2.32 uA / cm2, and is equivalent to that of a surface-coated stainless steel bipolar plate material. The copper titanium cobalt-contained high-corrosion-resistance austeniticstainless steel has the characteristics of low hardness and high ductility, and facilitates molding of bipolar plate runners.

The invention relates to copper-tungsten-cobalt containing high-corrosion-resistant stainless steel and a processing and heat treatment method thereof. The copper-tungsten-cobalt containing high-corrosion-resistant stainless steel contains, by mass, 0.08% or above of C, 11.0-15.0% of Ni, 18.0-20.0% of Cr, 3.0-4.0% of Mo, 1.22% or below of W, 0.2-0.8% of Cu, 0.1-0.5% of Co, 2.0% or below of Mn, 1.0% or below of Si, 0.035% or below of P, 0.030% or below of S and the balance Fe, wherein W is greater than or qual to 15.3 * (C-0.01) but smaller than or equal to 15.3 * C. After hot deformation, cogging, cold deformation, WC crushing and dispersion and high-temperature solid solution treatment, grains are coarsened. The corrosion current density in 0.5 mol / L of H2SO4 electrolyte containing 5 * 10-6F- at the temperature of 80 DEG C under the oxygen introduction condition is 1.97-2.54 micro-A / cm<2>, and is equivalent to a stainless steel bipolar plate material with a coated surface. The copper-tungsten-cobalt containing high-corrosion-resistant stainless steel has the advantages of low hardness and high elongation and is beneficial to the forming of a bipolar plate runner.

The invention discloses high corrosion resistant austenitic stainless steel containing copper-vanadium-cobalt and a processing and heat treatment method of the austenitic stainless steel. Alloy elements comprise, by mass percentage, smaller than or equal to 0.08 C, 10.0-14.0 Ni, 16.0-18.5 Cr, 2.0-3.0 Mo, smaller than or equal to 0.34 V, 0.2-0.8 Cu, 0.1-0.5 Co, smaller than or equal to 2.0 Mn, smaller than or equal to 1.0 Si, smaller than or equal to 0.035 P, smaller than or equal to 0.030 S, and the balance Fe, wherein 4.24x(C-0.01)<=V<=4.24xC. Due to thermal deformation cogging and cold deformation, VC breaking and dispersion are achieved, and grain coarsening is achieved after high temperature solid solution treatment. Under the oxygen introducing condition, the corroding current densityin a 0.5 mol / L H2SO4 electrolyte containing 5x10<-6>F<-> at 80 DEG C is 1.09-1.95 muA / cm<2>, and is equivalent to that of a stainless steel bipolar plate material subjected to surface coating. The high corrosion resistant austenitic stainless steel containing copper-vanadium-cobalt has the beneficial effects of low hardness and high extending, and forming of a bipolar plate flow channel is facilitated.

Disclosed are copper-zirconium-cobalt modified stainless steel and a processing and heat treatment method of the copper-zirconium-cobalt modified stainless steel. The copper-zirconium-cobalt modifiedstainless steel comprises the following alloy elements of, by mass percentage, C<=0.03, 12.0-15.0 of Ni, 16.0-18.0 of Cr, 2.0-3.0 of Mo, Zr<=0.53, 0.2-0.8 of Cu, 0.1-0.5 of Co, Mn<=2.0, Si<=1.0, P<=0.035, S<=0.030 and the balance Fe, wherein 7.59*C<=Zr<=7.59*C+0.3. Hot deformation cogging and cold deformation are carried out to break and disperse ZrC, and high-temperature solid solution treatment is performed to achieve grain coarsening. Under the condition of oxygen supply, the corrosion current density of a 0.5mol / L H2SO4 electrolyte containing 5*10<-6>F<-> at 80 DEG C is 1.23-1.76muA / cm<2> and is equivalent to that of a surface-coated stainless steel bipolar plate material. The copper-zirconium-cobalt modified stainless steel and the processing and heat treatment method of thecopper-zirconium-cobalt modified stainless steel have the advantages of low hardness, high extensibility and facilitating bipolar plate flow passage forming.