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A method for manufacturing high-strength heat-resistant steel plate for power station
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A manufacturing method and steel plate technology, which is applied in the field of manufacturing high-strength heat-resistant steel plates for power stations, can solve the problems of long heat treatment process, low efficiency, and high cost, and achieve the effects of good plate shape, reduced manufacturing costs, and reduced production costs
Active Publication Date: 2016-08-24
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0004] In order to solve the shortcomings of long heat treatment process flow, low efficiency and high cost in the manufacturing process of the existing high-strength heat-resistant steel plate for power station, the present invention provides a short process, high efficiency, low cost and excellent performance for the manufacture of steel plate for power station method
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Embodiment 1
[0036] The size specification of heat-resistant steel plate for power station is 25mm in thickness and 2000mm in width, and the mass percentage of its chemical composition is: C 0.088%, Si 0.224%, Mn 0.43%, P 0.012%, S 0.002%, Cr 8.86%, Mo 0.41%, V0.21%, W 1.61%, Nb 0.059%, N 0.057%, B 0.0022%, Ni 0.21%, Al 0.003%, the rest is Fe and unavoidable impurities.
[0038] Mechanical property requirements: yield strength R p0.2 ≥440MPa, tensile strength R m ≥620MPa, elongation A≥20%, normal temperature impact energy A KV2 ≥90J;
[0039] Plate type requirements: unevenness in the width direction of the steel plate ≤ 5mm / m.
[0040] This embodiment includes the following steps in sequence:
[0041] Ⅰ Billet preparation
[0042] After molten iron pretreatment, converter top and bottom double blowing, AOD and LF refining, the composition of molten steel meets the following requirements for tapping:
[0043] C 0.088%, Si 0.224%,...
Embodiment 2
[0063] The size specification of heat-resistant steel plate for power station is 36mm in thickness and 2000mm in width, and the mass percentage of its chemical composition is:
[0064] C 0.087%, Si 0.23%, Mn 0.44%, P 0.013%, S 0.001%, Cr 8.91%, Mo 0.43%, V 0.23%, W 1.63%, Nb 0.061%, N 0.059%, B 0.0021%, Ni 0.22 %, Al 0.004%, the rest is Fe and unavoidable impurities.
[0066] Mechanical property requirements: yield strength R p0.2 ≥440MPa, tensile strength R m ≥620MPa, elongation A≥20%, normal temperature impact energy A KV2 ≥90J;
[0067] Plate type requirements: unevenness in the width direction of the steel plate ≤ 5mm / m.
[0068] This embodiment includes the following steps in sequence:
[0069] Ⅰ Billet preparation
[0070] After molten iron pretreatment, converter top and bottom double blowing, AOD and LF refining, the composition of molten steel meets the following requirements for tapping:
[0071] C 0.087%,...
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Abstract
The invention relates to a method for manufacturing a high-strength heat-resistant steel sheet for a power station. According to the method, the prepared continuous casting billet comprises the following components in percentage by weight: 0.07-0.13% of C, 0.15-0.50% of Si, 0.35-0.55% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 8.50-9.50% of Cr, 0.30-0.6% of Mo, 0.15-0.25% of V, 1.50-2.00% of W, 0.04-0.07% of Nb, 0.035-0.065% of N, 0.002-0.005% of B, 0.10-0.30% of Ni and greater than 0 and less than or equal to 0.015% of Al; the annealing temperature is 740 + / -10 DEG C; defects are ground by virtue of hot grinding; the heating temperature of a steel billet is 1220 + / -10 DEG C; during rolling, the rolling-starting temperature is 1170-1200 DEG C, the pass reduction in roughing is 25-30%, the pass reduction in finishing is 30-35% and the final rolling temperature is 860-880 DEG C; the slow cooling pit temperature is not less than 200 DEG C and the steel sheet putting time is 120-180 minutes; the heat straightening is performed and the tempering temperature is 790 + / -10 DEG C. The method for manufacturing high-strength heat-resistant steel sheet for the power station is short in flow, high in efficiency and low in cost.
Description
technical field [0001] The invention relates to a method for manufacturing a high-strength heat-resistant steel plate for a power station. Background technique [0002] Due to its excellent high-strength and heat-resistant properties (strength parameters above 600Mpa and heat-resistant temperature up to 600°C), heat-resistant steel for power stations can be used as structural parts for the heating surface of power plant boilers and the structural manufacture of four major pipeline supports and hangers. [0003] In order to prepare high-strength heat-resistant steel plates for power stations that meet the performance requirements, the yield strength R p0.2 ≧440Mpa, tensile strength Rm≧620Mpa, elongation A≧20%, normal temperature impact energy A KV2 ≧90 J. In the actual production and trial production process, after the steel plate is rolled, it needs to be normalized and tempered off-line, resulting in long process flow, low efficiency and high cost. Contents of the inven...
Claims
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Application Information
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