220results about How to "Good cold bending performance" patented technology

The invention discloses a superhigh-strength high-toughness steel plate for ocean engineering and a manufacturing method thereof. The superhigh-strength high-toughness steel plate comprises the following chemical components in percentage by weight: 0.06-0.10% of C, 0.20-0.40% of Si, 1.10-1.65% of Mn, at most 0.010% of P, at most 0.0020% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.60-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.60% of Cu, 0.40-0.60% of Mo, 0.020-0.040% of Alt, and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting in a converter, rolling on a Steckel reversing mill, and finally carrying out hardening and tempering heat treatment by a TMCP (thermomechanical rolling process) technique. The steel plate has favorable properties: the tensile strength is 770-840 MPa, the yield strength is 710-800 MPa, the elongation percentage is 16-19%, the -40 DEG C low-temperature lateral impact and low-temperature ageing impact properties are greater than or equal to 90J, and the cold bending resistance is qualified; and thus, the steel plate has the advantages of ultrahigh strength, excellent low-temperature impact and low-temperature ageing impact properties, and stable production technique.

The invention relates to steel used for controlled rolling and cooling offshore platform, and a production method thereof. The invention belongs to the technical field of low-alloy high-strength steel. The steel was produced through slab continuous casting and TMCP processes after steel making and refining. The components of the slab are as follows: 0.05 percent to 0.09 percent of C, 1.20 percent to 1.60 percent of Mn, 0.20 percent to 0.50 percent of Si, 0.03 percent to 0.05 percent of Nb, 0.010 percent to 0.020 percent of Ti, 0.03 percent to 0.06 percent of V, equal to or less than 0.005 percent of S, 0.020 percent to 0.040 percent of Als, equal to or less than 0.015 percent of P, and the rest are Fe and impurities. Molten steel which is smelt by the component is cast into the slab which is 220mm to 250mm thick; the ingot is put into a slap heating furnace to be heated and rolled when being discharged. The initial billet temperature for rough rolling is 1060 DEG C to 1160 DEG C, the initial billet temperature for fine rolling is 840 DEG C to 940 DEG C, and the finishing temperature is 780 DEG C to 820 DEG C; the thickness of the rolled steel sheet is 10mm to 60mm. The starting cooling temperature is 760 DEG C to 810 DEG C; the finishing cooling temperature is 550 DEG C to 650 DEG C; the cooling speed is 10 DEG C/s to 17 DEG C/s. The production method has the advantages of simplified procedures and cost saving.

The invention discloses a zinc-plated hot-formed steel plate or steel strip with excellent cold bending performance and a manufacturing method thereof. The zinc-plated hot-formed steel plate or steelstrip comprises a base plate with a surface decarburization layer thickness of 20 [mu]m or below and a zinc coating with an adhesion amount of 10-100 g/m<2> on the base plate. The constituent weight percentage of the base plate is C: 0.1-0.8%, Si: 0.05-2.0%, Mn: 0.5-3.0%, P: <=0.1%, S: <=0.05%, Al: <=0.1%, N: <=0.01%, and the balance Fe and unavoidable impurities. The average size of original austenite grains of the base plate is 15 [mu]m or below. The hot-formed steel plate or steel strip has a continuous and complete coating, no cracks extending to the base plate and excellent cold bending performance on the basis of meeting the conditions that the tensile strength of the base plate after hot-forming is 1500 MPa and the elongation after breaking is 5%.

The invention relates to steel for a 36kg-grade ocean platform and a production method thereof, belonging to the technical field of a ship body and structural steel for oceanographic engineering. A steel plate with thickness of 5-50mm comprises the following chemical components: 0.14-0.18 percent of C, 0.20-0.50 percent of Si, 1.30-1.60 percent of Mn, 0.02-0.05 percent of Nb, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, 0.020-0.04 percent of Als, and the balance of Fe and inevitable impurities; a steel plate with the thickness of 50-80mm comprises the following chemical components: 0.12-0.18 percent of C, 0.20-0.50 percent of Si, 1.30-1.60 percent of Mn, 0.02-0.05 percent of Nb, 0.02-0.06 percent of V, 0.010-0.020 percent of Ti, 0.10-0.40 percent of Ni, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, 0.020-0.04 percent of Als, and the balance of Fe and inevitable impurities; and in addition, the sum of Nb, V and Ti is less than or equal to 0.12 percent. The production method has the advantages of low production cost, uniform and stable comprehensive performance and good cold bending property.

The invention relates to an ultra high-strength high titanium steel plate with yield strength of 960 Mpa and a preparing method of the same. The steel plate is composed of following components: C 0.06 to 0.09%, Si 0.10 to 0.50%, Mn 1.00 to 1.60%, P smaller than 0.015%, S smaller than 0.005%, Cr 0.20 to 0.50%, Mo 0.15 to 0.30 %, Nb 0.02 to 0.05%, Ti 0.06 to 0.20%, B 0.0005 to 0.003%, Cu not larger than 0.10%, Al 0.01 to 0.05%, N smaller than 0.005%, O smaller than 0.003%, Ni 0 to 0.30%, and the rest is Fe and unavoidable impurities. The preparing method comprises smelting and casting, continuous casting billet heating, two-stage rolling and a tempering treatment. The ultra high-strength high titanium steel plate has a good toughness and a good cold bending performance.

The invention discloses a thick plate for an ultra-high-strength hull structure. The mass percentage of the chemical composition of the thick plate is: C: 0.05-0.10%, Si: 0.1-0.55%, Mn: 1.0-1.6%, Nb: 0.02-0.05 %, Ti: 0.007-0.02%, Als: 0.020-0.050%, the balance is Fe and unavoidable impurities; among them, P<0.015%, S<0.005%, O<0.0020%, N<0.0045% in unavoidable impurities , H<0.0002%. The present invention produces ultra-high-strength hull structure thick plates through low-carbon, low-phosphorus, ultra-low-sulfur and TMCP processes under the condition of a 3500-steel rolling mill. It has good comprehensive performance and good cold-bending performance, and is a high-quality hull Structural steel.

The invention discloses a high-toughness hot-formed steel with tensile strength higher than or equal to the 1800 MPa grade and a production method thereof, and belongs to the technical field of metallurgy. The high-toughness hot-formed steel with the tensile strength higher than or equal to the 1800 MPa grade comprises components including, by mass, 0.29%-0.35% of C, not larger than 0.5% of Si, 0.5%-1.5% of Mn, not larger than 0.020% of P, not larger than 0.010% of S, not larger than 0.50% of Cr, 0.01%-0.06% of Al, 0.01%-0.06% of Nb, 0.01%-0.06% of V, not larger than 0.5% of Mo and the balanceFe and inevitable impurities. The high-toughness hot-formed steel is produced by the following processes including smelting, blank casting, hot rolling, cold rolling, annealing and hot forming. According to the high-toughness hot-formed steel and the production method, specific component alloy elements are added, the specific production processes are used in cooperation, and therefore the manufactured steel has the tensile strength higher than or equal to the 1800 MPa and has high toughness and high cold bending property.

The invention discloses ultra high strength ship plate steel and a production method thereof. A plate blank comprises the following components in percentage by weight: 0.02-0.09 percent of C, 0.1-0.4 percent of Si, 0.5-1.6 percent of Mn, 0.01-0.04 percent of Alt, 0.02-0.05 percent of Nb, 0.008-0.02 percent of Ti, 0.3-0.7 percent of Cr, 0.2-0.5 percent of Mo, 0.5-1 percent of Ni, 0.2-1 percent of Cu, less than 0.013 percent of P, less than 0.005 percent of S, less than 0.0012 percent of O, less than 0.0045 percent of N, less than 0.00015 percent of H and the balance of Fe and inevitable impurities. The production method comprises the following steps of heating the plate blank with the thickness of 220-300 mm before rolling at the temperature of 1250 DEG C; starting rough rolling at the starting temperature of not less than 1100 DEG C; starting finish rolling at the temperature of not more than 910 DEG C, and stopping finish rolling at the temperature of 870-890 DEG C; rolling a steel plate with the thickness of 10-60 mm; rapidly entering ACC to control cooling at the cooling speed of 8-12 DEG C/s after finish rolling; returning red at the temperature of 650-680 DEG C; and tempering for 90-180min at the temperature of 500-680 DEG C. The product has good comprehensive mechanical property.

The invention discloses a kind of steel for nuclear pressure vessels and a manufacturing method thereof. The manufacturing method comprises the following steps of: 1) smelting and plate blank casting, wherein the steel comprises the following components in percentage by weight: 0.05-0.20% of C, 0.10-0.40% of Si, 0.75-1.6% of Mn, 0.15-0.6% of Cr, 0.010-0.04% of Nb, 0.008-0.03% of Ti, 0.030-0.050% of Alt, 0.0010-0.0050% of Ca, 0.003-0.012% of N, less than or equal to 0.010% of S, less than or equal to 0.012% of P, less than or equal to 0.003 wt. % of Sn, less than or equal to 0.002% of Sb, less than or equal to 0.003% of As, and the balance of Fe and inevitable impurities, wherein Alt/N is greater than or equal to 2; 2) hot rolling, wherein the heating temperature of a plate blank is 1100-1250 DEG C, the first-stage rolling temperature is 950-1020 DEG C, the first-stage reduction ratio is greater than or equal to 80%, the second-stage rolling temperature is 780-900 DEG C, and the second-stage reduction ratio is greater than or equal to 60%; and 3) cooling and coiling, wherein the cooling speed is 4.0-15 DEG C/s, and the coiling temperature is 590-680 DEG C; and through a controlled rolling and cooling process, the microscopic structure of the obtained steel for nuclear pressure vessels is a fine ferritic and pearlitic structure.

The invention discloses a high-grade wear-resistant steel plate. The steel plate comprises the following components in percentage by mass: less than or equal to 0.26 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.30 percent of Ni, less than or equal to 1.50 percent of Cr, less than or equal to 0.06 percent of Nb, 0.02 to 0.06 percent of Al, less than or equal to 0.03 percent of Ti, less than or equal to 0.50 percent of Mo, less than or equal to 0.08 percent of V, less than or equal to 0.004 percent of B, and the balance of Fe and inevitable impurities. A method for producing the steel plate comprises smelting, casting, heating, rolling, straightening, shot blasting, quenching, heat treatment, cutting and other process steps. The steel plate has the advantages of steel purity, high strength, high hardness, good low temperature toughness, good weldability, good processability, good cold bending property, large steel plate thickness, good plate cut, little noble metal added to the steel plate and low cost. The steel plate can be widely used in the industry of manufacturing mining, engineering, metallurgical and other machinery with broad application prospects.

The invention belongs to the technical field of steel rolling, and particularly relates to a low cost hot continuous rolling plate strip steel for a 510MPa automotive frame and a production technology thereof. The hot continuous rolling plate strip steel for the automotive frame comprises the following components by weight percent: 0.13-0.18% of C, 0.30-0.50% of Si, 0.75-1.15% of Mn, 0.02-0.06% of Alt, less than or equal to 0.025% of P, less than or equal to 0.008% of S, 0.008-0.025% of Ti, less than or equal to 0.006% of N, the balance of Fe, and inevitable impurities. According to the production technology, by slightly adjusting the content of C and Si, lowering the content of Mn, only adding a small quantity of cheap Ti, and adding no other precious alloy elements, the production cost is remarkably lowered, the production quantity of the type of steel is reduced, the energy is saved, the consumption is lowered, the cost is lowered, and an automotive frame steel with excellent comprehensive properties is obtained, so that the production technology can provide products with high cost performance for the auto industry.

The invention provides a martensite-ferrite double-phase wear-resisting steel plate and a preparing method thereof. The martensite-ferrite double-phase wear-resisting steel plate comprises a martensite and ferrite double-phase structure, the volume fraction of the martensite structure is larger than 90%, the hardness of the martensite structure ranges from 480HB to 560HB, and the martensite structure is obtained by preparing C, Si, Mn, P, S, Nb, V, Ti, Mo, Ni, Cr, Al, B, N, Fe and other elements of the specific amount. The martensite-ferrite double-phase wear-resisting steel plate has the higher hardness and meanwhile has the good low-temperature toughness and wear-resisting performance; and manufacturing of mechanical parts under the atrocious environment particularly the condition with the extremely low temperature is facilitated. The preparing method of the martensite-ferrite double-phase wear-resisting steel plate is simple in process, the martensite and ferrite double-phase structure can be obtained, the hardness, the low-temperature toughness and the wear-resisting performance of the martensite and ferrite double-phase structure can be comprehensively improved, and large-scale production is facilitated.

The invention discloses a thick chromium-molybdenum steel plate for hydrogenation equipment, and also discloses a production method of a steel plate. The steel plate comprises the following components by weight percent: 0.12%-0.15% of C, 0.02%-0.07% of Si, 0.50%-0.60% of Mn, less than or equal to 0.007% of P, less than or equal to 0.005% of S, 2.35%-2.50% of Cr, 0.95%-1.10% of Mo, 0.012%-0.02% ofNb, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Ni, less than or equal to 0.003% of Sb, less than or equal to 0.005% of Sn, less than or equal to 0.016% of As, less than or equal to 0.003% of O, less than or equal to 0.008% of N and less or equal to 0.0002% of H, the balance of Fe and inevitable impurities. For the steel plate, an electroslag remelting technology is adopted,electroslag ingot with the maximum piece weight being 50t is melted, and the maximum thickness of the produced thick chromium-molybdenum steel plate for the hydrogenation equipment can achieve 198mm,and the maximum piece weight of the single-piece finished steel plate can achieve 37.2t by a heating-rolling technology and thermal-processing production equipment of normalizing plus accelerated cooling plus tempering.

The invention relates to a high strength hot rolled plate and a production process thereof, in particular to a heavy gauge hot rolled steel plate for a roll bending forming high strength steel plate pile and a production process thereof. The invention mainly solves the technical problems of inadequate thickness, and lowcold bending performance and absorbed-in-fracture energy in the prior high strength heavy gauge steel plate. The technical proposal comprises: the heavy gauge hot rolled steel plate for the roll bending forming high strength steel plate pile comprises the following chemical components by weight percentage: 0.08 to 0.15 percent of C, 0.10 to 0.40 percent of Si, 0.30 to 0.90 percent of Mn, 0.020 to 0.040 percent of Nb, 0.010 to 0.030 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, and the balance being Fe. The microscopic structures can be fine grain ferrites, and pearlitic structures plus a small amount of bainite structures which are dispersed; the grain size level is 11 to 14; and the banded structure level is less than 0.5. The high strength hot rolled plate is mainly used for producing the steel plate pile.

The invention belongs to the technical field of metallurgy, and in particular relates to a micro-niobium alloy hot rolled steel plate of a 490 MPa level and a production method thereof, aiming to solving the first technical problem of providing the hot rolled steel plate of the 490 MPa level with excellent comprehensive performance. The hot rolled steel plate of the 490 MPa level is prepared from the following chemical components in percentage by weight: 0.04-0.11 percent of C, 0.13-0.27 percent of Si, 0.9-1.30 percent of Mn, 0.001-0.007 percent of N, 0-0.027 percent of P, 0-0.017 percent of S, 0.01-0.09 percent of Al, 0.013-0.027 percent of Nb, 0.004-0.012 percent of Ti and the balance of Fe. The hot rolled steel plate of the 490 MPa level, which is provided by the invention, reaches the yield strength not less than 380 MPa, tensile strength not less than 490 MPa, elongation not less than 17 percent and excellent cold bending performance, has favorable room-temperature mechanical performance and process performance and fully accords with the requirements on technical indexes.

The invention discloses a hot-rolled pickling steel with a high surface quality and a tensile strength of 490 MPa and a manufacturing method. The weight percentages of its chemical components are: C: 0.060-0.080%, Si: 0.100-0.200%, : 1.000~1.250%, P≤0.020%, S≤0.008, Nb: 0.015~0.025%, Als: 0.015~0.040%, Cu≤0.300%, Ni≤0.300%, Cr≤0.300%; the rest is Fe and unavoidable impurity; the method is through hot metal desulfurization, converter smelting, vacuum treatment, continuous casting, shaping, slab heating, hot continuous rolling, laminar cooling, coiling, finishing, pickling process, levelling, coiling, recoiling, Manufactured by oiling and packaging, the hot-rolled pickled steel of the invention has the characteristics of good ductility, cold stamping performance, welding performance and good cold bending performance.

The invention provides a hot-rolled multiphase steel plate and a preparation method thereof. The invention has the advantages of the economical, reasonable, environmental-friendly design of steel component, being favorable for effective utilization and recycling of resources, being implemented and controlled easily, the simple and convenient process control, the high strength of steel plate and the good performance of cold bending and welding. The thickness of plate is 2.5 to 6 milimeter, the tensile strength of the hot-rolled steel plate is larger than 1000Megapascal, the yield strength is greater than or equal to 500Megapascal, the yield ratio is low, the minimum yield ratio is equal to 0.51 and the maximum is not higher than 0.80, the elongation A80 i.e. the sample of 80 milimeter of JIS13A standard distance is greater than or equal to 11 percent and the highest value reaches 20 percent, and the longitudinal direction and the transverse direction of cold bending meets the requirement of not cracking when d is equal to 4t. The microstructure is mainly Bainite and Martensite of higher than 90 percent and few ferrite of possible residual Austenite.

A non-heat treated wire or bar steel for springs which is characterized by having in its as-rolled state a tensile strength of 120-150 kgf/mm2 and a bending breakage rate no higher than 15% when tested according to JIS Z-2248 under the condition of r/d=2.8 where r (mm) denotes the inside radius of the bending curvature and d (mm) denotes the diameter of the as-rolled stock.

The invention relates to a large thickness and narrow hardness range wide-resistant steel sheet and a preparation method thereof. The steel sheet comprises the following components: 0.16-0.23% of C, 0.25-0.55% of Si, 0.60-1.00% of Mn, less than or equal to 0.013% of P, less than or equal to 0.003% of S, 0.010-0.030% of Ti, 0.25-0.50% of Ni, 0-0.030% of Nb, 0.40-0.70% of Cr, 0.20-0.50% of Mo, 0.0010-0.0035% of B, 0.010-0.050% of Al, and the balance of Fe and inevitable impurities, wherein the sum of the mass percent of Cr and B meets the following equation: (Cr + B) is greater than or equal to 0.159C + 0.235Mn + 7.282Ti + 0.249Ni or less than or equal to 0.51C + 0.371Mn + 8.147Ti + 0.401Ni. The steel sheet is 40-60 mm in thickness, and meets requirements on hardness at the 1/2 sheet thickness.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for producing a 490MPa level acid-washing-free hot rolled steel plate. The method comprises the following steps of: heating a continuous casting billet; hot rolling; cooling; reeling, and the like, wherein the billet comprises the following chemical compositions in percentage by weight: 0.04-0.11 percent of C, 0.13-0.27 percent of Si, 0.9-1.30 percent of Mn, 0.001-0.007 percent of N, 0-0.027 percent of P, 0-0.017 percent of S, 0.01-0.09 percent of Al, 0.013-0.027 percent of Nb, 0.004-0.012 percent of Ti and the balance of Fe; the heating temperature of the billet is 1,200-1,240 DEG C, the initial rolling temperature of the hot rolling is 1,120-1,220 DEG C, and the finish rolling temperature is 870-910 DEG C; front-section laminar flow water-cooling after rolling is used by the cooling step; and the temperature of the reeling step is 550-585 DEG C. In the invention, the yield strength of a finished steel band product obtained by the method is larger than or equal to 380MPa, the tensile strength is larger than or equal to 490 MPa, the elongation is larger than or equal to 17 percent, the cold bending property is good, and the proportion of Fe3O4 in an oxidized iron sheet on the surface of the finished product exceeds 80 percent.