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High-strength container plate with excellent low-temperature toughness and manufacturing method

A low-temperature toughness and manufacturing method technology, applied in the field of steel production, to achieve the effect of increasing strength, improving low-temperature toughness and strength, and reducing material consumption

Inactive Publication Date: 2020-11-06
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, in the prior art, there is no relevant report on low-temperature C-Mn steel with a service temperature of -80°C and a yield strength ≥ 460 MPa and a tensile strength ≥ 570 MPa.

Method used

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  • High-strength container plate with excellent low-temperature toughness and manufacturing method
  • High-strength container plate with excellent low-temperature toughness and manufacturing method
  • High-strength container plate with excellent low-temperature toughness and manufacturing method

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Embodiment Construction

[0030] The following examples provide a high-strength container plate with excellent low-temperature toughness and its manufacturing method. The chemical composition is shown in Table 1, the smelting and rolling process parameters are shown in Table 2, and the heat treatment process parameters are shown in Table 3. Specifically The steps are:

[0031] Steelmaking and continuous casting: steelmaking and continuous casting: pretreatment of molten iron, S content in molten iron < 0.002wt%, converter steelmaking, deep desulfurization and deoxidation in LF furnace, adjustment of alloy composition to the target range and superheat control, RH furnace desulfurization Gas, vacuum degree ≤0.3torr, RH refining, feeding pure calcium wire for calcium treatment, static stirring time after feeding wire ≥15min, continuous continuous casting into 260mm thick billet, casting billet for stack cooling treatment, stack cooling time ≥48 hours;

[0032] Slab heating: the slab is heated to 1130-1160...

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Abstract

The invention discloses a high-strength container plate with excellent low-temperature toughness and a manufacturing method, and relates to the technical field of iron and steel production. The high-strength container plate is prepared from the chemical composition in percentage by mass: 0.07% to 0.11% of C, 0.10% to 0.30% of Si, 1.30% to 1.60% of Mn, 0.40% to 0.80% of Ni, 0.05% to 0.12% of Mo, 0.02% to 0.05% of V, 0.02% to 0.05% of Alt, less than or equal to 0.008% of P, less than or equal to 0.002% of S and the balance of Fe and avoidable impurities. The material strength is upgraded by adding a small amount of alloy, the alloy cost is low, accurate control is easily achieved, the use temperature is lower, the strength is further significantly improved, and the material consumption of tank construction can be reduced.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a high-strength container plate with excellent low-temperature toughness and a manufacturing method. Background technique [0002] With the high-parameter development of steel for low-temperature containers in the chemical industry, some low-strength mature grades such as 09MnNiDR have been difficult to meet the needs of large-scale development of low-temperature spherical tanks such as ethylene. Reduce the thickness of steel used, reduce the risk of toughness of welded joints of large-thickness steel plates, reduce construction volume and weld seams, improve equipment construction efficiency, and reduce material costs. [0003] In terms of research and development of domestic high-strength low-temperature steel, the Chinese invention patent with the publication number CN110724878A proposes a 0.5Ni low-temperature steel and its manufacturing method, adding B element, ado...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C21D8/02
CPCC22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C21D8/0205C21D8/0226C21D8/0247
Inventor 谢章龙吴俊平方磊席连云张丙军李庆春
Owner NANJING IRON & STEEL CO LTD
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