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Vanadium nitrogen system Q460 strength level steel plate for low-temperature container and production method of steel plate

A low-temperature container and production method technology, applied in the field of metallurgy, can solve problems such as high cost, low steel plate strength, and low impact toughness, and achieve the effects of improving production efficiency, low yield ratio, and excellent impact toughness

Inactive Publication Date: 2017-11-07
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts high vanadium nitrogen composition design to lay the foundation for ensuring strength. Through the special sub-temperature quenching + tempering quenching and tempering heat treatment mode, the strength of the vanadium nitrogen series Q460 strength level steel plate for low temperature containers produced by normalizing + tempering is solved. The problem of low impact toughness and low impact toughness, while avoiding the problem of high cost caused by repeated rescue

Method used

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  • Vanadium nitrogen system Q460 strength level steel plate for low-temperature container and production method of steel plate
  • Vanadium nitrogen system Q460 strength level steel plate for low-temperature container and production method of steel plate
  • Vanadium nitrogen system Q460 strength level steel plate for low-temperature container and production method of steel plate

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Effect test

Embodiment 1

[0027] In this example, the thickness of the vanadium-nitrogen series Q460 steel plate for low-temperature vessels is 16mm, and its chemical composition and mass percentage are: C: 0.19%, Mn: 1.45%, P: 0.016%, S: 0.005%, Ni: 0.25%, Nb: 0.025%, V: 0.163%, Al: 0.035%, N: 0.0167%, and the rest are iron and unavoidable impurities.

[0028] The production method of the vanadium-nitrogen series Q460 strength steel plate for cryogenic vessels in this embodiment includes rolling, quenching, and tempering processes, and the specific process steps are as follows:

[0029] (1) Rolling process: Type II controlled rolling is adopted, the second-stage rolling temperature is 860-880 °C, the final rolling temperature is 790-810 °C, and the thickness of the steel is 60 mm;

[0030] (2) Quenching process: quenching in a roller hearth quenching furnace, the quenching temperature is 740 ° C ~ 770 ° C, the holding time is 1.5 ~ 2.5min / mm, after the holding is completed, the surface of the steel pl...

Embodiment 2

[0038] In this example, the thickness of the vanadium-nitrogen series Q460 steel plate for low-temperature vessels is 18.5 mm, and its chemical composition and mass percentage are: C: 0.19%, Mn: 1.50%, P: 0.013%, S: 0.002%, Ni : 0.28%, Nb: 0.028%, V: 0.176%, Al: 0.035%, N: 0.0190%, and the rest are iron and unavoidable impurities.

[0039] The production method of the vanadium-nitrogen series Q460 strength steel plate for cryogenic vessels in this embodiment includes rolling, quenching, and tempering processes, and the specific process steps are as follows:

[0040] (1) Rolling process: Type II controlled rolling is adopted, the second-stage rolling temperature is 870°C, the final rolling temperature is 800°C, and the thickness of the steel is 70mm;

[0041] (2) Quenching process: quenching in a roller hearth quenching furnace, the quenching temperature is 760°C, and the holding time is 2.0min / mm. After the holding, the surface of the steel plate is water-cooled to room temper...

Embodiment 3

[0049]In this example, the thickness of the vanadium-nitrogen-based Q460-strength steel plate for low-temperature vessels is 20 mm, and its chemical composition and mass percentage are: C: 0.19%, Mn: 1.60%, P: 0.012%, S: 0.001%, Ni: 0.32%, Nb: 0.033%, V: 0.17%, Al: 0.040%, N: 0.0215%, and the rest are iron and unavoidable impurities.

[0050] The production method of the vanadium-nitrogen series Q460 strength steel plate for cryogenic vessels in this embodiment includes rolling, quenching, and tempering processes, and the specific process steps are as follows:

[0051] (1) Rolling process: Type II controlled rolling is adopted, the second-stage rolling temperature is 860°C, the final rolling temperature is 810°C, and the thickness of the steel is 70mm;

[0052] (2) Quenching process: Quenching in a roller hearth quenching furnace, the quenching temperature is 770°C, and the holding time is 1.5min / mm. After the holding, the surface of the steel plate is water-cooled to room tem...

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Abstract

The invention discloses a steel plate for a vanadium nitrogen series Q460 strength grade low-temperature container and a production method thereof. 0.005%, Ni: 0.25-0.35%, Nb: 0.025-0.033%, V: 0.15-0.20%, Al: 0.035-0.040%, N: 0.015-0.025%, the rest are Fe and inevitable impurities; the production method includes Rolling, quenching and tempering process. The overall performance and structure of the vanadium nitrogen series Q460 strength grade low-temperature container steel plate produced by the invention are uniform, the impact toughness is excellent at -40°C, the lower yield ratio greatly improves the safety factor of the product, the overall performance is uniform and stable, and the effective Improve production efficiency and reduce production costs.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a vanadium-nitrogen-based steel plate for low-temperature containers of Q460 strength level and a production method thereof. Background technique [0002] With the rapid development of the transportation industry, customers have more and more stringent requirements on the quality of products. For example, the mobile tanker adopts Q460 level strength requirements, and can withstand low temperature impact toughness at -40°C. The safety factor sets the ratio of yield strength to tensile strength to ≤0.85 and other special requirements. [0003] In general, in order to ensure the low temperature and strength properties of vanadium-nitrogen series Q460 strength grade container steel, normalizing + tempering treatment is adopted, but the steel plate produced by this method has low physical strength and a small margin of impact toughness. The production method of the pre...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/08C22C38/12C22C38/06B21C37/02C21D8/02
CPCC22C38/04B21C37/02C21D8/0205C21D8/0221C21D8/0247C22C38/001C22C38/06C22C38/08C22C38/12
Inventor 邓建军谷盟森高雅龙杰张海军耿宽宽张鹏云张志军徐腾飞王晓书靳兴亚
Owner WUYANG IRON & STEEL
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