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Production process for reducing surface cracks of chromium-molybdenum alloy steel plates with high chromium content

A production process and chrome-molybdenum alloy technology, applied in the field of metallurgy, can solve the problems of high technical requirements for quality control of casting billets, lack of mature technology, easy to produce cracks, etc. crack effect

Active Publication Date: 2020-04-28
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the high content of chromium and molybdenum alloy elements in the chromium-molybdenum alloy steel plate, and the chromium content reaches 9%, it is difficult to realize the production of continuous casting slabs. craft
Therefore, this kind of steel plate is produced by the method of ingot billeting, but the surface of the steel plate is prone to cracks during the production process. Therefore, key processes such as ingot pouring, billet crack cleaning, and heating and rolling are the main research directions, and a complete set of production methods is developed. It is of great significance to reduce the occurrence of cracks on the steel plate surface

Method used

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  • Production process for reducing surface cracks of chromium-molybdenum alloy steel plates with high chromium content
  • Production process for reducing surface cracks of chromium-molybdenum alloy steel plates with high chromium content

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Effect test

Embodiment 1

[0020] The chromium-molybdenum alloy steel plate SA387MGr9Cl1 specification of present embodiment high chromium content is 23mm*3030mm*9870mm, C: 0.13%, Mo: 0.98%, Cr: 8.0%, the production technology of reducing the chromium-molybdenum alloy steel plate surface crackle of high chromium content comprises Smelting, casting, ingot annealing, ingot billeting and cutting, billet primary annealing, billet cleaning, billet secondary annealing, billet rolling, the specific process steps are as follows:

[0021] (1) Smelting process: low temperature removal of P during the oxygen melting stage of electric furnace steelmaking, ladle temperature of 1655°C, no slag tapping; white slag retention time of 40 minutes during refining process, vacuum degree of 50 Pa during vacuum treatment, vacuum retention time of 35 minutes, smelting end point control Harmful elements: P: 0.006%, S: 0.002%, Sb: 0.003%, Sn: 0.003%, As: 0.001%;

[0022] (2) Casting process: the pouring ladle temperature is 1560...

Embodiment 2

[0032] The chromium-molybdenum alloy steel plate SA387MGr9Cl1 specification with high chromium content of this embodiment is 23mm*2850mm*9240mm, C: 0.11%, Mo: 1.05%, Cr: 9.5%, the production process of reducing the surface crack of the chromium-molybdenum alloy steel plate with high chromium content includes Smelting, casting, ingot annealing, ingot billeting and cutting, billet primary annealing, billet cleaning, billet secondary annealing, billet rolling, the specific process steps are as follows:

[0033] (1) Smelting process: low temperature removal of P during the oxygen melting stage of electric furnace steelmaking, ladle temperature of 1655°C, no slag tapping; white slag retention time of 40 minutes during refining process, vacuum degree of 50 Pa during vacuum treatment, vacuum retention time of 35 minutes, smelting end point control Harmful elements: P: 0.005%, S: 0.002%, Sb: 0.003%, Sn: 0.003%, As: 0.001%;

[0034] (2) Casting process: the pouring ladle temperature is...

Embodiment 3

[0043] The chromium-molybdenum alloy steel plate SA387MGr9Cl1 specification of present embodiment high chromium content is 30mm*2480mm*1200mm, C: 0.13%, Mo: 0.99%, Cr: 9.7%, the production technology that reduces the chromium-molybdenum alloy steel plate surface crackle of high chromium content includes Smelting, casting, ingot annealing, ingot billeting and cutting, billet primary annealing, billet cleaning, billet secondary annealing, billet rolling, the specific process steps are as follows:

[0044] (1) Smelting process: low-temperature removal of P during the oxygen melting stage of electric furnace steelmaking, ladle temperature of 1660 ° C, no slag tapping; white slag retention time of 40 minutes in the refining process, vacuum degree of 43 Pa in the vacuum treatment process, vacuum retention time of 34 minutes, and control of the smelting end point Harmful elements: P: 0.004%, S: 0.003%, Sb: 0.001%, Sn: 0.003%, As: 0.002%;

[0045] (2) Casting process: the pouring ladl...

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Abstract

The invention discloses a production process for reducing surface cracks of chromium-molybdenum alloy steel plates with high chromium content. The production process includes the processes of smelting, pouring, steel ingot annealing, steel ingot cogging-down and cutting, cogging-down material primary annealing, cogging-down material cleaning, cogging-down material secondary annealing and cogging-down material rolling. According to the production process for reducing the surface cracks of the chromium-molybdenum alloy steel plates with the high chromium content, the risk of the cracks generatedon the surface of the rolled steel plates is eliminated from the source through the control over the steel ingot smelting and pouring processes; carbon arc gouging is adopted to clean micro-crack defects generated on the surface of blanks, so that the problem that the defects are difficult to overcome through traditional flame cleaning is solved; and through the control over the blank heating androlling processes, the potential adverse factors of surface cracks are reduced. According to the production process for reducing the surface cracks of the chromium-molybdenum alloy steel plates withthe high chromium content, the phenomenon of the cracks on the surface of the steel plates can be reduced, the probability of the steel plates being scrapped due to the surface cracks is reduced, goodbenefits are achieved, and the production process is suitable for the production of high-strength chromium-molybdenum alloy steel plates, with the thickness of 12-30 mm, the carbon content of 0.1%-0.13%, the molybdenum content of 0.9%-1.1% and the chromium content of 8%-10%, for power equipment and petrochemical industry pipe fittings.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production process for reducing surface cracks of chromium-molybdenum alloy steel plates with high chromium content. Background technique [0002] Chromium-molybdenum alloy steel has excellent high temperature resistance strength and creep resistance, and its corrosion resistance and oxidation resistance are significantly higher than other grades of alloy steel. Components, which can improve the thermal fatigue resistance of equipment, have better thermal conductivity and lower expansion than other austenitic steels, and can be widely used in superheater and reheater pipes in power plant boilers. Headers and steam pipes under high temperature steam conditions are also used in heating furnace pipes in the petrochemical industry. [0003] Due to the high content of chromium and molybdenum alloy elements in the chromium-molybdenum alloy steel plate, and the chromiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21C5/52C21C7/10C21C7/076C21C7/00B22D1/00
CPCB22D1/00C21C5/52C21C7/0006C21C7/076C21C7/10C21D8/0226C21D8/0263Y02P10/20
Inventor 邓建军赵国昌高雅刘彦强顾自有石天柱曾小峰霍圆圆齐燕吉大地张伟
Owner WUYANG IRON & STEEL
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