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High-toughness quasi-subcritical quenching 09MnNiDR container steel and preparation method

A sub-temperature quenching and high-toughness technology, which is applied in the high-toughness quasi-sub-temperature quenching 09MnNiDR container steel and the field of preparation, can solve the problem of not fully considering the uniformity of the mechanical properties of the steel plate and the impact performance, and achieves improved compactness and low temperature impact. Toughness, the effect of ensuring uniformity

Active Publication Date: 2021-08-06
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impact properties of 1 / 2 thickness are individually focused, but the overall mechanical properties of the steel plate (such as elongation) or the uniformity of impact properties at different thicknesses of the steel plate have not been fully considered

Method used

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  • High-toughness quasi-subcritical quenching 09MnNiDR container steel and preparation method
  • High-toughness quasi-subcritical quenching 09MnNiDR container steel and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example provides a high-toughness quasi-subtemperature quenching 09MnNiDR container steel with a thickness of 80mm. Its chemical composition and mass percentage are as follows: C: 0.095%, Si: 0.34%, Mn: 1.45%, P≤0.008%, S≤ 0.002%, Ni: 0.78%, Alt≥0.035%, Nb: 0.023%, V: 0.006%, Ti: 0.005%, Ca: 0.0016%, and the rest are Fe and residual elements.

[0032] The preparation method includes the following steps:

[0033] Steelmaking process: S: 0.006% after molten iron pretreatment, P: 0.006% after deep converter desulfurization, S: 0.001% after LF deep desulfurization, control of ultra-low As, Sb, Sn, Pb, Bi, B residual elements; smelting uses components Qualified molten iron is used as raw material, and alloys are added during the molten steel smelting process to avoid the increase of residual elements; after RH ends, the temperature of molten steel is 1545°C, until the continuous casting tundish, the superheat of molten steel is controlled at 12-19°C, continuous casting ...

Embodiment 2

[0040] This example provides a high-toughness quasi-subtemperature quenching 09MnNiDR container steel with a thickness of 65mm. Its chemical composition and mass percentage are as follows: C: 0.07%, Si: 0.24%, Mn: 1.35%, P≤0.012%, S≤ 0.002%, Ni: 0.56%, Alt: 0.032%, Nb: 0.015%, V: 0.005%, Ti: 0.008%, Ca: 0.0020%, and the rest are Fe and residual elements.

[0041] The preparation method includes the following steps:

[0042] Steelmaking process: S: 0.005% after molten iron pretreatment, P: 0.010% after deep converter desulfurization, S: 0.0015% after LF deep desulfurization, control of ultra-low As, Sb, Sn, Pb, Bi, B residual elements; smelting uses components Qualified molten iron is used as raw material, and alloys are added during the molten steel smelting process to avoid the increase of residual elements; after RH ends, the temperature of molten steel is 1545°C, until the continuous casting tundish, the superheat of molten steel is controlled at 12-19°C, continuous casting...

Embodiment 3

[0049] This example provides a high-toughness quasi-subtemperature quenching 09MnNiDR container steel with a thickness of 40 mm. Its chemical composition and mass percentage are as follows: C: 0.05%, Si: 0.18%, Mn: 1.28%, P≤0.014%, S≤ 0.005%, Ni: 0.48%, Alt: 0.025%, Nb: 0.004%, V: 0.025%, Ti: 0.003%, Ca: 0.0018%, and the rest are Fe and residual elements.

[0050] The preparation method includes the following steps:

[0051] Steelmaking process: S: 0.005% after molten iron pretreatment, P: 0.010% after deep converter desulfurization, S: 0.002% after LF deep desulfurization, control of ultra-low As, Sb, Sn, Pb, Bi, B residual elements; smelting uses components Qualified molten iron is used as raw material, and alloys are added during the molten steel smelting process to avoid the increase of residual elements; after RH ends, the temperature of molten steel is 1545°C, until the continuous casting tundish, the superheat of molten steel is controlled at 12-19°C, continuous casting...

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Abstract

The invention discloses high-toughness quasi-subcritical quenching 09MnNiDR container steel and a preparation method, and relates to the technical field of steel production. The high-toughness quasi-subcritical quenching 09MnNiDR container steel comprises the following chemical components in percentage by mass: less than or equal to 0.10% of C, 0.15-0.50% of Si, 1.20-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.30-0.80% of Ni, more than or equal to 0.02% of Alt, less than or equal to 0.040% of Nb, less than or equal to 0.040% of V, less than or equal to 0.020% of Ti, 0.0010-0.0040% of Ca and the balance Fe and residual elements. Under the condition that the strength of a steel plate is not reduced, the core impact performance of the 09MnNiDR steel plate with the thickness of 40-80 mm is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a high-toughness quasi-subtemperature quenching 09MnNiDR container steel and a preparation method thereof. Background technique [0002] 09MnNiDR steel is steel for low-temperature pressure vessels, mainly used in key parts of equipment used in petroleum, chemical, power station and other industries. Therefore, the low temperature impact performance and internal quality requirements of 09MnNiDR steel plate are relatively high. In recent years, with the improvement of product quality, more and more manufacturers and customers have put forward higher requirements for steel grades. For 09MnNiDR steel, the impact of its core will inevitably affect its use. For 09MnNiDR steel of thick gauge cryogenic pressure vessel, the uniformity of plate toughness in the thickness direction is required to ensure that the steel and equipment can adapt to various loads. and low te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C21D8/0226C21D8/0263C21D1/18C21D2211/002C21D2211/005Y02P10/20
Inventor 张丙军方磊谢章龙席连云吴俊平武会宾李志超宁博
Owner NANJING IRON & STEEL CO LTD