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Large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and production method thereof

A production method and large unit weight technology, applied in the field of metallurgy, can solve problems such as the inability to realize large-thickness, large-unit-weight steel plates in batch production, unplanned difficulties in steel plate cracks, and prolonged heat preservation time, so as to reduce the risk of cracks and improve plasticity and toughness. Good, easy-to-handle effects

Inactive Publication Date: 2021-02-19
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the mold welding temperature of this type of material is relatively high, usually above 700°C. Due to the wall thickness and safety factor, the heat preservation time is extended to 32h, which has caused great difficulties in the production of this type of steel plate. At the same time, the thickness of some ordered steel plates is currently It is more than 150mm, and the single weight of the steel plate is more than 30t. Relying on the existing technology, it is impossible to realize the mass production of large thickness and large single weight steel plates. change

Method used

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  • Large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and production method thereof
  • Large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and production method thereof
  • Large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and production method thereof

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Effect test

Embodiment 1

[0038] In this embodiment, the thickness of the vanadium-chromium-molybdenum steel plate is 184 mm, and the unit weight of the steel plate is 57.7 t. The chemical composition and mass percentage of the steel plate are shown in Table 19. Its production method includes smelting die casting, ingot annealing, billet annealing, mechanical treatment, billet annealing, hot rolling, and heat treatment processes. The specific process steps are as follows:

[0039] (1) Smelting and die-casting process: smelting by electric arc furnace, when the temperature of molten steel reaches 1600°C, the steel is tapped; then it is sent to LF refining furnace for refining for 1 hour, deoxidized by weak deoxidation + deep deoxidation, pumped after refining After vacuum treatment for 30 minutes, carry out the mold casting process to produce ingots; the chemical composition and mass percentage of the ingots are the same as Table 19;

[0040] (2) Ingot annealing process: After the smelting and die-casti...

Embodiment 2

[0052] In this embodiment, the thickness of the vanadium-chromium-molybdenum steel plate is 150mm, and the unit weight of the steel plate is 49.2t. The chemical composition and mass percentage of the steel plate are shown in Table 19. Its production method includes smelting die casting, ingot annealing, billet annealing, mechanical treatment, billet annealing, hot rolling, and heat treatment processes. The specific process steps are as follows:

[0053] (1) Smelting and die-casting process: smelting by electric arc furnace, when the temperature of molten steel reaches 1600°C, the steel is tapped; then it is sent to LF refining furnace for refining for 1 hour, deoxidized by weak deoxidation + deep deoxidation, pumped after refining After vacuum treatment for 30 minutes, carry out the mold casting process to produce ingots; the chemical composition and mass percentage of the ingots are the same as Table 19;

[0054] (2) Ingot annealing process: After the smelting and die-casting...

Embodiment 3

[0067] In this embodiment, the thickness of the vanadium-chromium-molybdenum steel plate is 256mm, and the unit weight of the steel plate is 38.6t. The chemical composition and mass percentage of the steel plate are shown in Table 19. Its production method includes smelting die casting, ingot annealing, billet annealing, mechanical treatment, billet annealing, hot rolling, and heat treatment processes. The specific process steps are as follows:

[0068] (1) Smelting and die-casting process: smelting by electric arc furnace, when the temperature of molten steel reaches 1600°C, the steel is tapped; then it is sent to LF refining furnace for refining for 1 hour, deoxidized by weak deoxidation + deep deoxidation, pumped after refining After vacuum treatment for 30 minutes, carry out the mold casting process to produce ingots; the chemical composition and mass percentage of the ingots are the same as Table 19;

[0069] (2) Ingot annealing process: After the smelting and die-casting...

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Abstract

The invention discloses a large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and a production method thereof, and belongs to the technical field of metallurgy. The steel plate comprises the following chemical components in percentage by weight: 0.12-0.14% of C, 0.06-0.08% of Si, 0.4-0.6% of Mn, 0.007-0.009% of P, less than or equal to 0.004% of S, 2.2-2.5% of Cr, 1.0-1.1% of Mo, 0.28-0.35% of V, 0.1-0.2% of Ni, less than or equal to 0.05% of Nb, less than or equal to 0.2% of Cu, less than or equal to 0.003% of Sb, less than or equal to 0.004% of Sn, less than or equal to 0.005% of As and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting and carrying out die casting, annealing cast ingots, cogging and annealing, carrying out mechanical treatment, annealing steel billets, carrying out hot rolling and carrying out heat treatment. According to the large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and the production method thereof, the risk of generation of cracks on the surface of the steel plate can be reduced; and the steel plate is excellent in cold bending performance and can be widely used in equipment such as a hydrogenation reactor and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-thickness large single-weight vanadium-chromium-molybdenum steel plate and a production method thereof. Background technique [0002] Vanadium-chromium-molybdenum-added steel plates have higher strength and better high-temperature creep properties due to the addition of vanadium, and can meet the higher operating temperature and lightweight requirements of the pressure vessel industry, so they are more and more widely used. With the current development of large-scale equipment and heavy oil products, the operating temperature has gradually increased to above 454°C, and the unit weight of equipment produced by adding vanadium-chromium-molybdenum steel plates is increasing day by day. It is mainly used in hydrodesulfurization units and hydrocracking In the device, it is used to process the hydrogen-containing high-temperature and high-pressure process fluid, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/42C21D8/02C21D1/28C21D1/26
CPCC21D1/26C21D1/28C21D8/0226C21D8/0247C21D8/0263C21D2211/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 吴艳阳李杰龙杰庞辉勇袁锦程侯敬超牛红星尹卫江李样兵顾自有王东阳赵紫娟瞿征
Owner WUYANG IRON & STEEL
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