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A method for producing cr-mo steel plates from small single-weight billets

A billet and single-weight technology, which is applied in the field of Cr-Mo steel plate production from small single-weight billets, can solve the problems of large economic losses, poor flaw detection, and easy gaps, etc., and achieve the effect of reducing economic losses

Active Publication Date: 2021-09-24
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the billet is widened by transverse rolling, due to the large internal stress of the fire-cut edge, defects such as gaps and cracks are prone to occur during fire-cut edge rolling, and the steel plate cannot be rolled. Unplanned, large economic losses and affect the steel plate delivery time

Method used

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  • A method for producing cr-mo steel plates from small single-weight billets

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Experimental program
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Effect test

Embodiment 1

[0021] The method for producing the Cr-Mo steel plate from the small single-weight billet of the present embodiment comprises the following steps:

[0022] (1) It is produced with high-quality materials, with a billet unit weight of 5t and a length of 1400mm;

[0023] (2) Billet preheating annealing: the billet is preheated and annealed before cutting. The preheating annealing process is: within 24 hours, the temperature is raised to 650°C for 20 hours, and after the heat preservation is completed, it is lowered to 200°C for 26 hours;

[0024] (3) Billet cutting: After the billet is preheated and annealed, it is cut with temperature, the cutting speed is 100mm / min, and the cutting temperature is 200°C;

[0025] (4) Blank cleaning after cutting: flame cleaning is carried out on the fire-cut edge of the blank after cutting. When cleaning, the flame gun and the surface of the blank are at 30°, and the cleaning temperature is 170°C. It is required that the blank after cleaning has...

Embodiment 2

[0031] The method for producing the Cr-Mo steel plate from the small single-weight billet of the present embodiment comprises the following steps:

[0032] (1) It is produced with Liku material, the billet unit weight is 4.8t, and the length is 1350mm;

[0033] (2) Billet preheating annealing: the billet is preheated and annealed before cutting. The preheating annealing process is: within 22 hours, the temperature is raised to 600°C for 24 hours, and after the heat preservation is completed, it is lowered to 220°C for 24 hours;

[0034] (3) Billet cutting: After the billet is preheated and annealed, it is cut with temperature, the cutting speed is 70mm / min, and the cutting temperature is 180°C;

[0035] (4) Blank cleaning after cutting: flame cleaning is carried out on the flame-cut edge of the blank after cutting. When cleaning, the flame gun and the surface of the blank are at 23°, and the cleaning temperature is 150°C. It is required that the blank after cleaning has no def...

Embodiment 3

[0040] The method for producing the Cr-Mo steel plate from the small single-weight billet of the present embodiment comprises the following steps:

[0041] (1) It is produced with Liku materials, the billet unit weight is 4.7t, and the length is 1260mm;

[0042] (2) Billet preheating annealing: the billet is preheated and annealed before cutting. The preheating annealing process is: within 23 hours, the temperature is raised to 640 ° C for 21 hours, and 24.5 hours after the end of the heat preservation, it is lowered to 210 ° C and released;

[0043] (3) Billet cutting: After the billet is preheated and annealed, it is cut with temperature, the cutting speed is 80mm / min, and the cutting temperature is 190°C;

[0044] (4) Blank cleaning after cutting: flame cleaning is carried out on the fire-cut edge of the blank after cutting. When cleaning, the flame gun and the surface of the blank are at 27°, and the cleaning temperature is 155°C. It is required that the blank after cleani...

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Abstract

The invention discloses a method for producing a Cr-Mo steel sheet from a small single-weight billet. The method comprises the following steps: (1) preheating and annealing the billet: the temperature is raised to 600-650°C within 22-24 hours, and the temperature is maintained for 20-24 hours. After 24-26h, the temperature is lowered to 200-220℃; (2) blank cutting: cutting temperature is 180-200℃; (3) blank cleaning after cutting: flame cleaning is carried out on the cutting edge, and the cleaning temperature is 150-170℃; (4) ) After cutting, the billet is loaded into the furnace: the charging temperature is 120-150 ℃; (5) the billet rolling after cutting: the pass reduction during longitudinal rolling is 20-30mm, and the pass reduction during cross-rolling is 10-15mm. The invention reduces the defects such as gaps and bursts caused by the production of Cr-Mo steel sheets from small single-weight blanks by preheating annealing, cutting, cleaning, furnace loading and rolling process control of the blanks. / T47013.3‑2015 standard I level flaw detection pass rate ≥ 97%, thereby reducing economic losses.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing Cr-Mo steel plates from small single-weight billets. Background technique [0002] For some Cr-Mo steel plates with smaller unit weight specifications, the production yield of conventional blanks is low, and the amount of edge trimming is too large, which will cause greater economic losses. Material rolling production. The so-called "liku material" means that after the continuous casting slab is pulled out, most of the slabs are used to roll steel plates, while the remaining small part of the slabs were not rolled because there were no suitable single-weight steel plates at that time. Rolling is carried out when the steel plate is rolled, and this part of the billet is called Liku material. Liku materials generally have a single weight ≤ 5t, a length ≤ 1400mm, and the chemical composition, thickness, and width of the billet are consistent w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 邓建军李杰侯敬超龙杰袁锦程吴艳阳牛红星尹卫江李样兵顾自有王东阳金武涛
Owner WUYANG IRON & STEEL
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