65results about How to "Guaranteed Low Temperature Toughness" patented technology

The invention relates to a method for welding a large liquified natural gas storage tank. The method uses alternating rectangular wave current for welding with a welding parameter of between 8.156 and 24.32 KJ/cm and the interlayer temperature of energy input of between 18.9 and 24.32 KJ/cm of 300 DEG C, and selects low carbon type nickel-based welding wire. The method overcomes the problem of arc blow in welding, not only can avoid impact on 9 percent Ni steel during carbon gouging, but also can save welding materials and manpower so as to accelerate construction process and improve welding efficiency. Welding with the process can improve the cold temperature flexibility of a macrograin area of a welding zone, avoid generation of brittle tissue of a fusion area, avoid generation of cold and heat crack in welding, has excellent quality of weld joint, and effectively ensure the cold temperature flexibility of 9 percent Ni steel welding joints. The method well control the quality of the weld joint, and ensures the overall quality of the natural gas storage tank.

The invention provides a stainless steel tube for a brake system of a rail vehicle and a method for producing the same. The stainless steel tube comprises the following components in weight percentage: less than 0.030 percent of C, more than 0 percent or less than 1.00 percent of Si, more than 0 percent or less than 1.50 percent of Mn, less than 0.40 percent of P, less than 0.015 percent of S, 10.5 to 12.50 percent of Cr, 0.30 to 1.00 percent of Ni, less than 0.030 percent of N, more than 0 percent or less than 0.10 percent of Cu, 6*(C+N) to 0.75 percent of Ti and Nb, and the balance of Fe and inevitable impurities. The method for producing the stainless steel tube comprises the following steps of: smelting, continuous casting, hot rolling, punching or extruding, and deep processing of the steel tube; the method is characterized in that molten iron is made into molten steel according to the components of the stainless steel tube; at the hot rolling step, the start-rolling temperature is between 1,080 and 1,150 DEG C, and the end-rolling temperature is between 850 and 900 DEG C; and the punching or extruding deformation temperature is controlled to be between 850 and 1,100 DEG C. The stainless steel tube produced by the method has the advantages of good corrosion resistance, good welding, mechanical and cold processing properties, and low price.

The present invention discloses a good low-temperature high-toughness normalizing type high-strength pressure container steel plate, wherein the chemical components comprise, by weight, 0.10-0.22% of C, less than or equal to 0.40% of Si, 1,10-1.80% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.40% of Ni, less than or equal to 0.035% of Nb, less than or equal to 0.17% of V, 0.0070-0.0190% of N, 0-0.025% of Als, 0-0.018% of Ti, and the balance of Fe and unavoidable inclusion, wherein (V+Ti+Nb)/N is more than or equal to 3.5 and is less than or equal to 15, and (C+V+2Ti) is more than or equal to Ti+Nb/(3.5N) and is less than or equal to 5V/(C+V+Nb). The good low-temperature high-toughness normalizing type high-strength pressure container steel plate has the following characteristics that: the yield strength is more than or equal to 460 MPa, the tensile strength is 630-725 MPa, the elongation is more than or equal to 25%, the yield ratio is less than or equal to 0.85, the weldability is good, and the production cost is low.

The invention discloses low-temperature ductility 1.5Ni steel and a manufacturing method thereof, wherein the low-temperature ductility 1.5Ni steel comprises the chemical components according to percentages by weight of 0.02-0.10 percent of C, 0.22-0.30 percent of Si, 1.00-1.50 percent of Mn, less than or equal to 0.08 percent of V, 1.20-1.60 percent of Ni, less than or equal to 0.005 percent of S, less than or equal to 0.010 percent of P, less than or equal to 0.03 percent of Nb, less than or equal to 0.04 percent of Ti, less than or equal to 0.04 percent of Al, 0.002-0.005 percent of N and the rest of Fe and unavoidable impurities. The manufacturing method comprises the following steps of smelting and casting into a casting blank, heating the casting blank, controlled rolling and heat treatment. In the invention, after the micro alloy steel finishes the controlled rolling, a high-strength low-temperature pressure vessel steel plate which has yield strength of more than 400MPa, tensile strength of more than 500MPa and satisfies the low-temperature impact ductility requirement of 100 DEG C below is produced through adopting a thermal refining method. The invention is suitable for manufacturing vessels, such as a low-temperature pressure vessel, a liquefied natural gas storage tank, a liquefied petroleum gas storage tank, a petrochemical storage tank, and the like.

The invention discloses X60N normalizing pipeline steel and a production method thereof. The X60N normalizing pipeline steel comprises the following elements: 0.07 to 0.15 percent of C, 0.20 to 0.40 percent of Si, 1.55 to 1.7 percent of Mn, greater than or equal to 0.008 percent of P, greater than or equal to 0.015 percent of S, greater than or equal to 0.10 percent of Mo, 0.02 to 0.05 percent of Alt, greater than or equal to 0.30 percent of Ni, greater than or equal to 0.30 percent of Cr, greater than or equal to 0.30 percent of Cu, 0.004 to 0.008 percent of V, 0.03 to 0.06 percent of Nb, 0.005 to 0.025 percent of Ti, and Fe and inevitable impurity elements for the surplus. The production method mainly comprises converter smelting, continuous casting, rolling and normalizing heat treatment. The X60N normalizing pipeline steel with strength and tenacity being properly matched with each other through rolling and normalizing heat treatment, the strength property of the steel is guaranteed by increasing the carbon content, the tenacity of the steel, especially the low-temperature tenacity of the steel, is greatly improved through the added Nb, V and Ti microalloy elements and normalizing heat treatment. The X60N normalizing pipeline steel produced through the method is small and uniform in phase transformation structures, and has not only high strength but also very excellent low-temperature tenacity.

The invention relates to a sulfuric acid resistant ferritic stainless steel and a manufacturing method thereof. The sulfuric acid resistant ferritic stainless steel comprises the following chemical components by weight: 0.002-0.015% of C, 0.002-0.015% of N, 0.2-1.0% of Si, 0.2-0.5% of Mn, less than or equal to 0.030% of P, less than or equal to 0.003% of S, 28-30% of Cr, 1.5-3% of Ni, 2.0-4.0% of Mo, 0.1-0.3% of V, 0.10-0.30% of Ti, 0.2-0.5% of Nb, 0.05-0.1% of Al, with the sum of Cr+3.3*Mo being greater than or equal to 38%, and Ti+Nb being greater than or equal to 16(C+N), less than or equal to 0.005% of O, and the balance Fe and inevitable impurities. The ferritic stainless steel provided by the invention can tolerate the corrosion of various concentration sulfuric acids at a temperature of less than 60 DEG C and at a concentration of less than or equal to 98wt%, also has good impact toughness and welding performance. With a pitting resistance equivalent PREN of greater than or equal to 38, the ferritic stainless steel has corrosion resistance far superior to conventional ferritic stainless steel, and is equivalent to superaustenitic stainless steel and nickel based alloys.

The invention relates to a high-hardenability and high-strength ultra-thick marine steel plate. The high-hardenability and high-strength ultra-thick marine steel plate is 60-150 mm thick and is composed of the chemical components of, by weight percentage, 0.04-0.08% of C, 4-9% of Mn, 0.10-0.25% of Si, 0.01-0.03% of Als, 0.2-0.5% of Mo, 0.025-0.050% of Nb, less than or equal to 0.04% of S, less than or equal to 0.007% of P, and Fe and impurity elements as balance. The high-hardenability and high-strength ultra-thick marine steel plate can solve the phenomenon of non-uniformity of thickness direction texture and performance, expand the thickness specification to 150 mm with low-temperature toughness still meeting the operating requirements at -80 DEG C and obtain low yield ratio under equal yield strength conditions, specifically, the parts of 1/4 and 1/2 thickness of the steel plate reach a yield strength not lower than 690 MPa, a yield ratio not higher than 0.86, an elongation percentage not lower than 20%, and a -80 DEG C low-temperature impact energy greater than 100 J.

The invention relates to a large-thickness high-toughness steel plate and a production method thereof. The large-thickness high-toughness steel plate comprises the chemical composition, by mass: C: 0.03-0.07%, Si <= 0.10%, Mn: 1.40-1.60%, P <= 0.015%, S <= 0.010%, Nb: 0.040- 0.050%, Ti: 0.010-0.020%, Cr: 0.20-0.30%, Ni: 0.05-0.15%, Cu: 0.15-0.25%, Alt: 0.020-0.050%, N <= 0.005% and the balance iron and inevitable impurities, and meanwhile the formulas: Cr*7 <= Mn + Cr <= (Mn + Cr + Ni + Cu) * 0.9 and 1.8 <= Cu/Ni <= 2.8 are met. Through reasonable component design and a TMCP controlled rollingand controlled cooling process in a matched mode, the prepared steel plate is good in mechanical property and welding property and wide in application field.

An H-section steel has a predetermined chemical composition, an Nb content and a B content satisfy Nb+125×B≧0.075%, a thickness of a flange is 12 mm to 40 mm, and in a thickness center portion and ¼ flange width portion of the flange, a metallographic structure of a cross-section perpendicular to a rolling direction contains pearlite having a distribution density of 3.2×10⁻³ units/μm² or lower and the remainder is formed of ferrite and bainite.

The invention relates to high-nickel steel for a low-temperature container. The high-nickel steel comprises, by weight, 0.01%-0.10% of C, 0.10%-0.25% of Si, 0.50%-1.50% of Mn, 5.0%-6.0% of Ni, 0.05%-0.30% of Mo, 0.30%-0.90% of Cr, 0.03%-0.20% of RE, less than or equal to 0.005% of S, less than or equal to 0.008% of P, and the balance Fe and impurities. By adding a certain amount of the Cr, the Moand rare earth into the steel, the strength and the low-temperature toughness reach the standard requirements of 9% Ni steel; rare earth elements are added, so that molten steel is purified, and the effect of harmful elements is greatly reduced; the rare earth elements are mainly dissolved in austenite, so that the strength of a matrix and the Ni content of the matrix can be improved, the number of the residual austenite is increased, and the toughness of the steel is improved; and controlled rolling and online quenching and two-phase region quenching and high-temperature tempering heat treatment are adopted by a manufacturing method after smelting. The use amount of nickel is greatly reduced, the production cost of the steel is reduced, and the method is especially suitable for construction of liquefied natural gas (LNG) storage tanks.

The invention relates to a high-strength steel gas-shielded welding flux-cored wire, which is composed of a steel sheath and a core powder, in terms of total weight percentage, C 0.04-0.10%, Si 0.3-0.9%, Mn 0.5-2.0%, Cr 5-10%, Ni 5.0-8.0%; in the core powder, the conversion value of Mg oxide MgO is 0.5-3.5%, the conversion value of Ti oxide TiO2 is 2-7%, and MgO/TiO2=0.2-0.8, fluorine Compound conversion value 0.5‑1.5, and an appropriate amount of arc stabilizer, the rest is iron. The tensile strength of the prepared weld metal is above 980MPa, which is suitable for all-position welding.

The invention discloses nickel-free high-strength low-yield ratio medium manganese low-temperature steel.The nickel-free high-strength low-yield ratio medium manganese low-temperature steel comprises, by mass, 0.03-0.06% of C, 4.5-6.0% of Mn, 0.15-0.23% of Si, 0.015-0.030% of Als, 0.1-0.3% of Mo, 0.006% or less of S, 0.009% or above of P and the balance Fe and impurity elements.The metallographic structure of the low-temperature steel is a complex-phase structure of tempered ferrite batten beam and a rotation austenite.By means of the alloy design mode that nickel is replaced by manganese and the reasonable rolling and the heating technology, the material acquires superior low-temperature tenacity, and cost is greatly reduced compared with that of other low-temperature steel.Meanwhile, the low-temperature steel further has the remarkable advantages of being high in yield strength and low yield ratio, and therefore the low-temperature steel is wider in application range and higher in structural safety.

The invention discloses ocean engineering steel with welded joint CTOD (crack tip opening displacement) greater than 0.5mm and a preparation method, belonging to the technical field of ocean engineering steel. The ocean engineering steel comprises the following chemical components in percentage by weight: 0.05-0.12% of C, 0.10-0.40% of Si, 1.0-1.50% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb, 0.010-0.02% of Ti, 0.1-0.5% of Ni, less than 0.01% of P, less than 0.005% of S and the balance of Fe and unavoidable impurities. The alloy content is adjusted according to the effect of the alloy element in the steel, the parameters of the controlled-rolling and controlled-cooling process are strictly controlled, and the obtained 10-80mm steel plate has comprehensive mechanical properties that the welded joint CTOD is greater than 0.5mm at -10 DEG C under 420MPa and the lamellar tearing resistance is greater than 35% and the like. The ocean engineering steel disclosed by the invention has excellent comprehensive properties and can be widely applied to the key parts of the stationary, semi-submersible and self-elevating platforms.

The invention discloses anti-shock, corrosion resisting and fire resisting steel and a preparing method thereof, and belongs to the technical field of building structure steel. The problems that in the prior art, the anti-shock, corrosion resisting and fire resisting steel preparing technology is complex, and technology control difficulty is large are solved. The anti-shock, corrosion resisting and fire resisting steel comprises chemical components including, by mass percent, 0.06%-0.10% of C, 0.65%-1.00% of Si, 0.80%-1.20% of Mn, 0.50%-0.60% of Mo, 1.00%-1.50% of Ni, 0.72%-1.00% of Cr, 0.25%-0.40% of Cu, 0.01%-0.03% of Ti, 0.05%-0.10% of Nb, 0.03%-0.10% of V, 0.015%-0.055% of Al, smaller than 0.015% of P, smaller than 0.005% of S, smaller than 0.003% of O, smaller than 0.005% of N and thebalance Fe and inevitable impurities. The preparing method comprises smelting and casting and two-stage controlled rolling. The preparing method is simple and easy to control, and the comprehensive performance of the prepared anti-shock, corrosion resisting and fire resisting steel is good.

The invention discloses anti-aseismic fire-resistant steel and a preparation method thereof, and belongs to the technical field of steel for a building structure. The anti-aseismic fire-resistant steel consists of the following chemical components in percentage by mass: 0.06%-0.10% of C, 0.65%-1.00% of Si, 1.85%-2.50% of Mn, 0.51%-0.60% of Mo, 1.00%-1.50% of Ni, 0.01%-0.03% of Ti, 0.05%-0.10% of Nb, 0.03%-0.10% of V, 0.015%-0.055% of Al, less than 0.015% of P, less than 0.005% of S, less than 0.003% of O, less than 0.005% of N, and the balance of Fe and inevitable impurities. The preparation method for the anti- aseismic fire-resistant steel comprises the following steps: smelting and casting; and performing two-stage control rolling. The preparation method is simple and easy to control, and the prepared anti-aseismic fire-resistant steel has good combination property.

A high strength and low yield ratio steel that has excellent characteristics such as low temperature toughness, a tensile strength of approximately 600 MPa or more and a low yield ratio of 80% or less. The high strength and low yield ratio steel includes, by weight percent: C: 0.02 to 0.12%, Si: 0.01 to 0.8%, Mn: 0.3 to 2.5%, P: 0.02% or less, S: 0.01% or less, Al: 0.005 to 0.5%, Nb: 0.005 to 0.10%, B: 3 to 50 ppm, Ti: 0.005 to 0.1%, N: 15 to 150 ppm, Ca: 60 ppm or less, and the balance of be and inevitable impurities, and further includes at least one component selected from the group consisting of by weight percent: Cr: 0.05 to 1.0%, Mo: 0.01 to 1.0%, Ni: 0.01 to 2.0%, Cu: 0.01 to 1.0% and V: 0.005 to 0.3%, wherein a finish cooling temperature is limited to 500 to 600° C. after the finish-rolling process. The high strength and low yield ratio steel satisfying characteristics such as low temperature toughness, brittle crack arrestability and low yield ratio, and the manufacturing method thereof may be provided.

The invention provides supporting steel for a containment vessel of a nuclear power station and a manufacturing method thereof. The steel comprises the following components in percentage by weight: 0.10%-0.16% of C, 0.25%-0.45% of Si, 1.40%-1.65% of Mn, 0.45%-0.65% of Ni, 0.20%-0.50% of Cr, 0.20%-0.55% of Mo, 0.02%-0.04% of Alt, 0.05%-0.10% of Cu, 0.03-0.05% of V, 0.005-0.020% of Ti, 0.008% or less of P, 0.005% of less of S, 0.010% or less of N, and the balance being Fe and unavoidable impurities. The manufacturing method comprises smelting, continuous casting, heating, rolling and heat treatment. The thickness of a steel plate produced from the steel is 30-80 mm, the steel plate in the quenched and tempered state, simulated post-weld heat treatment state and 200 DEG C high temperature state completely meets the requirements of technical indicators, and meanwhile -40 DEG C impact absorption energy is still remained at a high level.

Belonging to the technical field of high polymer materials, the invention relates to a low odor and high toughness modified PC/ABS material for vehicles and a preparation method thereof, and solves the technical problem of low impact strength of low odor PC/ABS materials in the prior art. The material is composed of 30-80% of PC, 15-65% of ABS, 1-3% of a compatilizer, 1-2% of zeolite, 1-3% of a toughening agent, and 0.1-1% of an antioxidant. The invention also provides a preparation method of the above-mentioned low odor and high toughness modified PC/ABS material for vehicles, and the prepared material not only ensures the low odor, but also guarantees the normal temperature and low temperature toughness of the material, and is especially suitable for automobile parts.

A Ti-containing ferritic stainless steel sheet having a large gauge thickness and excellent toughness has a chemical composition containing, in terms of percentage by mass, from 0.003 to 0.030% of C, 2.0% or less of Si, 2.0% or less of Mn, 0.050% or less of P, 0.040% or less of S, from 10.0 to 19.0% of Cr, 0.030% or less of N, from 0.07 to 0.50% of Ti, from 0.010 to 0.20% of Al, from 0 to 1.50% of Mo, and from 0 to 0.0030% of B, the balance of Fe and unavoidable impurities. The steel has a K value defined by the following expression of 150 or more: K value=−0.07′Cr−6790′Free(C+N)−1.44′d+267, and having a sheet thickness of from 5.0 to 11.0 mm. Herein, Free(C+N) corresponds to the solid-dissolved (C+N) concentration (% by mass), and d represents an average crystal grain diameter (μm).