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Thick plate for high-strength container with excellent core toughness and manufacturing method thereof

A high-strength, core technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc.

Active Publication Date: 2021-11-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, steel plates with a thickness > 50mm in the prior art, which can meet the service temperature of -70°C and have a yield strength ≥ 420MPa and a tensile strength ≥ 560MPa, have not been reported yet.

Method used

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  • Thick plate for high-strength container with excellent core toughness and manufacturing method thereof
  • Thick plate for high-strength container with excellent core toughness and manufacturing method thereof
  • Thick plate for high-strength container with excellent core toughness and manufacturing method thereof

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Embodiment Construction

[0032] The following examples provide a thick plate for high-strength containers with excellent core 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. The specific steps are as follows: steelmaking and continuous casting: pretreatment of molten iron, S content in molten iron < 0.002wt%, converter steelmaking, deep deoxidation and desulfurization in LF furnace, adjustment of alloy composition to the target range, degassing in RH furnace, vacuum The temperature is less than or equal to 0.3 torr; the continuous casting is carried out with the weak cooling of the secondary cooling water and the low casting speed scheme, the casting speed is 0.8-1.2m / min, the thickness of the continuous casting slab is 260mm, and the casting slab is subjected to stack cooling treatment, and the stack cooling time is ≥48 hours;

[0033] ...

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Abstract

The invention discloses a thick plate for high-strength containers with excellent core toughness and a manufacturing method, and relates to the technical field of iron and steel production. Its chemical composition and mass percentage are as follows: C: 0.08%-0.12%, Si: 0.10%-0.30 %, Mn:1.10%~1.50%, Ni:0.50%~0.80%, Mo:0.08%~0.15%, V:0.03%~0.06%, P≤0.006%, S≤0.002%, the balance is Fe and not Avoid impurities. The maximum thickness is 80mm, which meets the requirements of high-strength low-temperature container plates used under the condition of ‑70 °C, 1 / 4 thick and core ‑70 °C KV 2 Value ≥ 150J, yield strength ≥ 420MPa, tensile strength ≥ 560MPa, can be used to build large cryogenic spherical tanks or storage tanks.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a thick plate for high-strength containers with excellent core toughness and a manufacturing method. Background technique [0002] With the development of large-volume chemical low-temperature spherical tanks and other equipment, the requirements for the thickness of steel plates for low-temperature containers are also gradually increasing. When building large-scale low-temperature vinyl spherical tanks, in order to improve the uniformity of steel plate thickness in the direction of performance to ensure equipment safety, a large thickness is generally required The impact performance of the steel plate core must also meet the technical index requirements. As the thickness of the plate increases, the rolling compression ratio decreases when the same thickness of the billet is used. It is difficult to ensure the impact performance of the core after normalizing + tempering,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C21D1/18C21D6/00C21D8/02C21D9/00C22C33/04
CPCC22C38/02C22C38/04C22C38/08C22C38/12C22C38/002C22C33/04C21D1/18C21D6/005C21D6/008C21D6/001C21D8/0221C21D9/0081C21D2211/009
Inventor 谢章龙吴俊平席连云方磊李庆春
Owner NANJING IRON & STEEL CO LTD
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