161results about How to "Improve creep strength" patented technology

The invention discloses a new high-resistance electrical heating alloy material and a preparation method thereof. The material comprises the following components by weight percent: 0.01-0.06% of C, 1.0-1.5% of Si, 0.1-0.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 20-23% of Cr, 74.0-78.0% of Ni, 0.1-0.25% of Al, 0.2-1.0% of Fe, 0.01-0.2% of Ti, 0.2-0.8% of Zr and the balance of inevitable impurities. The preparation method comprises the steps of smelting, forging, wiring, annealing, rinsing, drawing and the like. Compared with Cr20Ni80, the prepared new high-resistance electrical heating alloy material has better oxidation resistance and is an electrical heating alloy material with low thermal expansion coefficient, good high temperature strength, long service life and high resistivity.

The invention discloses a high-resistance electrothermal alloy material, which comprises the following components in percentage by weight: 0.02 to 0.08 percent of C, 0.75 to 1.6 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 20 to 23 percent of Cr, 0.1 to 0.5 percent of Al, 0.2 to 0.8 percent of Y, 0.2 to 1.0 percent of Fe, and the balance of Ni and inevitable impurities. The preparation method for the high-resistance electrothermal alloy material comprises the following steps of: smelting; forging; coiling; annealing; rinsing; mold drawing, and the like. Compared with Cr20Ni80, the high-resistance electrothermal alloy material has higher antioxidation performance, and is an electrothermal alloy material with small thermal expansion coefficient, high high-temperature strength and processability, long service life and high resistivity.

An austenitic stainless steel excellect in high temperature strength and creep rupture ducitility which comprises, on the percent by mass basis, C: 0.03-0.12%, Si: 0.2-2%, Mn: 0.1-3%, P: 0.03% or less, S: 0.01% or less, Ni: more than 18% and less than 25%, Cr: more than 22% and less than 30%, Co: 0.04-0.8%, Ti: 0.002% or more and less than 0.01%, Nb: 0.1-1%, V: 0.01-1%, B: more than 0.0005% and 0.2% or less, sol. Al: 0.0005% or more and less than 0.03%, N: 0.1-0.35% and O (Oxygen): 0.001-0.008%, with the balance being Fe and impurities. The austenitic stainless steel may contain a specified amount of one or more element(s) of Mo and W, and/or a specified amount of one or more element(s) of Mg, Zr, Ca, REM, Pd and Hf.

An oxidation resistant, nickel base superalloy is described. The combination of alloy and a thermal barrier coating can be used to fabricate turbine components with good high temperature strength and good oxidation resistance, while maintaining other relevant properties.

The invention discloses nickel-based high-temperature alloy used for an ultra-supercritical boiler and a preparation method and application of the nickel-based high-temperature alloy and belongs to the technical field of high-temperature alloy materials. The alloy comprises, by weight, 0.02-0.08% of C, 21-25% of Cr, 10-16% of Co, 1.0-3.0% of Mo, 1.0-3.0% of Nb, 1.0-1.8% of Al, 1.5-2.5% of Ti, 0.002-0.008% of B, 0.002-0.03% of Si, 0-10% of Fe and the balance Ni and inevitable impurities. The alloy is high in creep strength, excellent in structure stability and good in oxidation resistance and corrosion resistance within the applicable temperature range; meanwhile, the cold and hot machining performance is excellent, and the alloy can serve for a long time at the temperature of 600-800 DEG C.

Provided are a method of manufacturing a brazed rotor composed of a wheel and a shaft joined to the former by brazing, having a durability and a reliability which can be enhanced without increasing the manufacturing man hours, and a turbine rotor for an exhaust turbo-supercharger. The wheel having a disc portion formed at its outer periphery with blades, and a rod-like shaft are arranged in a furnace, being opposed to each other at their surfaces to be joined with a brazing solder being interposed therebetween, and infrared radiation is irradiated onto a side part of the wheel so as to heat the surfaces to be joined up to a temperature in a range from 1,000 to 1,080 deg. C. in order to melt the brazing solder, thereby the wheel and the shaft are joined by brazing to each other at their surfaces to be joined.

An austenitic stainless steel welded joint, whose base metal and weld metal each comprises, by mass percent, C: not more than 0.3%, Si: not more than 2%, Mn: 0.01 to 3.0%, P: more than 0.04% to not more than 0.3%, S: not more than 0.03%, Cr: 12 to 30%, Ni: 6 to 55%, rare earth metal(s): more than 0.2% to not more than 0.6%, sol. Al: 0.001 to 3% and N: not more than 0.3%, with the balance being Fe and impurities, and satisfies the formula of (Cr+1.5×Si+2×P)/(Ni+0.31×Mn+22×C+14.2×N+5×P)<1.388, in spite of having a high P content and showing the fully austenitic solidification, has excellent resistance to the weld solidification cracking. Therefore, the said austenitic stainless steel welded joint can be widely used in such fields where a welding fabrication is required. Each element symbol in the above formula represents the content by mass percent of the element concerned.

The invention discloses ascalloy which comprises the following chemical components by weight percentage: 0.05 to 0.15 of C, 0.1 to 0.5 of Si, 0.1 to 1.0 of Mn, 11.0 to 13.0 of Cr, 0.1 to 1.0 of Mo, 0.10 to 0.30 of V, 0.01 to 0.20 of Nb, 0.1 to 3.0 of W, 0.5 to 3.0 of Co, 0.1 to 1.0 of Cu, 0.001 to 0.008 of B, 0.01 to 0.11 of N, less than or equal to 0.03 of Al, less than or equal to 0.030 of P, less than or equal to 0.015 of S and the balance of Fe and inevitable of impurities. The chemical components meet a relational expression: Cr+2Mo+W-40C-30N-Co-0.5Cu is less than 7.5. The preparation method comprises the steps that high-temperature deformation processing is performed at the upper limitation of the temperature of 1200 DEG C, and the total elongation percentage is more than or equal to 3. The ascalloy obtained by the invention has favorable ageing rear toughness, heat oxidation resistance and steam etching.

The invention discloses an improved 21/4Cr-1Mo-1/4V steel forging which is characterized by comprising the following components in percent by weight: 0.11-0.15 percent of carbon, not more than 0.10 percent of silicon, 0.30-0.60 percent of manganese, not more than 0.01 percent of phosphorus, not more than 0.01 percent of sulfur, 2-2.5 percent of chromium, 0.9-1.10 percent of molybdenum, not more than 0.20 percent of nickel, not more than 0.15 percent of copper, 0.25-0.35 percent of vanadium, not more than 0.30 percent of titanium, not more than 0.002 percent of boron, not more than 0.07 percent of niobium, not more than 0.015 percent of calcium and the balance of iron. The invention also discloses an automatic temperature-control inflation three-dimensional circulating water rapid cooling thermal treatment method of the steel forging, which comprises the steps of: 1, an after-forging thermal treatment process: normalizing at a temperature of 890-990 DEG C, air-cooling after constant temperature is not less than 1h/100mm, tempering at a temperature of 680-720 DEG C, furnace-cooling after constant temperature, and cooling at a limited speed at a temperature of below 400 DEG C; 2, a thermal refining process: quenching at a temperature of 900-980 DEG C, carrying out constant temperature with 1h/100mm, rapidly cooling and quenching and tempering at a temperature of 680-720 DEG C, carrying out constant temperature with 1h/100mm and air-cooling thickness of the forging, wherein the water temperature of thickness of the forging is not more than 10 DEG C; and 3, adopting a three-dimensional automatic control circulating water periphery inflation method. The forging has higher tension strength, temper brittleness resistance, hydrogen damage resistance and lower long-term high-temperature damage sensitivity.

The invention discloses third-generation nickle base monocrystal high temperature alloy with a stable texture and a preparation method thereof. The third-generation nickle base monocrystal high temperature alloy is composed of Al, Ta, W, Re, Mo, Cr, Co, Hf and Ni; and W and Ni are added in the form of Ni-W intermediate alloy. Directional solidification is adopted to prepare monocrystal alloy; through multistep high temperature long-time solid solution homogenization treatment, high temperature aging treatment and low temperature aging treatment, the third-generation nickle base monocrystal high temperature alloy is free of incipient melting and precipitation of TCP phase to lower the TCP precipitation tendency, so that alloy reducing Re content reaches the performance level of the third-generation nickle base monocrystal high temperature alloy, and the obtained nickle base monocrystal high temperature alloy has higher intermediate and high temperature strength, excellent instant tensile property and creep property and high texture stability.

The present invention provides a high-chromium heat-resistant steel. The steel contains in mass %, C: 0.08% to 0.13%; Si: 0.15% to 0.45%; Mn: 0.1% to 1.0%; Ni: 0.01% to 0.5%; Cr: 10.0% to 11.5%; Mo: 0.3% to 0.6%; V: 0.10% to 0.25%; Nb: 0.01% to 0.06%; N: 0.015% to 0.07%; B: ≦0.005%, and Al: ≦0.04%. The balance consists of Fe and inevitable impurity elements. The steel shows a martensitic microstructure.

A Ni-based single crystal superalloy which has the following composition: Co: 0.0 wt % or more to 15.0 wt % or less, Cr: 4.1 to 8.0 wt %, Mo: 2.1 to 4.5 wt %, W: 0.0 to 3.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.00 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 8.1 to 9.9 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities. As a result, the Ni-based single crystal superalloy which includes more than 8 wt % of Re in the composition ratio and has excellent specific creep strength and the turbine blade incorporating the Ni-based single crystal superalloy may be made.

The present invention provides a magnesium die cast alloy with excellent heat resistance and casting property, and its composition contains (wt%) 1.5-6% of aluminium, 0.3-2% of calcium, 0.01-1% of strontium, 0.1-1% of manganese and the rest is magnesium and inevitable impurity. According to said invention in the above-mentioned composition a rare earth element composition can be added, it can obtain better effect.

A low-cost creep-resistant magnesium alloy and its preparation method. The creep-resistant magnesium alloy is formed by adding Mg-Sr master alloy to AZ91D, AM50B or AM60B melt, and die-casting, wherein the Mg-Sr master alloy The added amount of Sr is 0.10-5.0% by weight of the AZ91D, AM50B or AM60B magnesium alloy. The method includes the following process: the first step, melting and casting the Mg-(20-65) wt% Sr master alloy billet; the second step, extruding the Mg-(20-65) wt% Sr master alloy billet into Φ2mm ~Φ60mm wire or rod; the third step is to melt the traditional AZ91D, AM50B or AM60B magnesium alloy, add Mg-(20~65)wt%Sr master alloy to the AZ91D, AM50B or AM60B melt, and die-cast it into an anti- Creep magnesium alloys. The creep resistance of the magnesium alloy at 150°C to 175°C is greatly improved, which can meet the application of the magnesium alloy on important parts such as engine block, automatic transmission, crankcase, gear chamber cover, and oil pan.