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Cr-Mo steel billet cogging slow cooling process

A billet and slow cooling technology, applied in the field of metallurgy, can solve problems such as affecting production efficiency, uneven cooling rate, surface defects, etc., and achieve the effects of excellent mechanical properties, reduction of billet cracks, and flexible operation.

Inactive Publication Date: 2020-04-17
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Cr-Mo series steels for pressure vessels, especially for 12Cr2Mo1R and 12Cr2Mo1VR series steels, because the steel contains high alloying elements Cr, Mo, and V at the same time, during the cooling process of the billet after billeting, as the temperature continues to decrease, the internal and external The temperature difference is getting bigger and bigger. Due to the uneven cooling rate of each part, the internal and external temperature difference will further form thermal stress. If the internal stress is not annealed in time to eliminate the internal stress, surface defects or stress cracking will occur, even if the crack is not serious, it will affect production efficiency. , if the crack is severe, the billet will be scrapped

Method used

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Effect test

Embodiment 1

[0024] The steel grade of the Cr-Mo steel in this embodiment is 12Cr2Mo1R ingot; the specification of the steel plate is 150mm in thickness and 3300mm in width.

[0025] After the ingot is billeted, the billet is put into the slow cooling pit, the thickness of the billet is 400mm, and the furnace charging temperature is 300°C; then the temperature is raised slowly, and the temperature is raised to 600°C at a rate of 65°C / h, and then the heat preservation time is 45h; , then lower the temperature to 200°C at a rate of 50°C / h, and then take out the furnace for cleaning and cutting at a temperature of 150°C, and then install the furnace for heating and rolling at a temperature of 100°C.

[0026] The specific steps of heating and rolling in the present invention are as follows: the billet is heated in a continuous furnace with a heating temperature of 1230°C and a heating coefficient of 11cm / min, and then it is rolled out of the furnace. A two-stage rolling process is adopted, and ...

Embodiment 2

[0030] The steel grade of the Cr-Mo steel in this embodiment is 12Cr2Mo1R ingot finished product; the specification of the steel plate is 200 mm in thickness and 3500 mm in width.

[0031] After the ingot is billeted, the billet is put into the slow cooling pit, the thickness of the billet is 500mm, and the furnace temperature is 400°C; then the temperature is raised slowly, and the temperature is raised to 640°C at a rate of 100°C / h, and then the heat preservation time is 50h; , then lower the temperature to 300°C at a rate of 80°C / h, and then take out the furnace for cleaning and cutting at a temperature of 200°C, and then install the furnace for heating and rolling at a temperature of 150°C.

[0032] The specific steps of heating and rolling in the present invention are as follows: the billet is heated in a continuous furnace with a heating temperature of 1250°C and a heating coefficient of 13cm / min, and then it is rolled out of the furnace, using a two-stage rolling process...

Embodiment 3

[0035] The steel grade of the Cr-Mo steel in this embodiment is 12Cr2Mo1VR ingot; the specification of the steel plate is 180mm in thickness and 3400mm in width.

[0036] After the ingot is billeted, the billet is put into the slow cooling pit, the thickness of the billet is 450mm, and the furnace charging temperature is 350°C; then the temperature is raised slowly, and the temperature is raised to 630°C at a rate of 80°C / h, and then the heat preservation time is 47h; , then lower the temperature to 260°C at a rate of 70°C / h, and then take out the furnace for cleaning and cutting at a temperature of 170°C, and then install the furnace for heating and rolling at a temperature of 130°C.

[0037] The specific steps of heating and rolling in the present invention are as follows: the billet is heated in a continuous furnace with a heating temperature of 1240°C and a heating coefficient of 12cm / min, and then it is rolled out of the furnace. A two-stage rolling process is adopted, and...

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Abstract

The invention discloses a Cr-Mo steel billet cogging slow cooling process. The Cr-Mo steel billet cogging slow cooling process comprises the following specific steps of (1) a charging process at a temperature, specifically, feeding a billet cogged by a steel ingot into a slow cooling pit at the charging temperature of 300-400 DEG C; (2) heating process, specifically, after charging the blank, heating at the rate of 65-100 DEG C / h; (3) a heat preservation process, specifically, heating to a heat preservation temperature of 600-640 DEG C, and carrying out heat preservation for 45-50 hours; and (4) a cooling process, specifically, cooling to 200-300 DEG C after the heat preservation is finished, then discharging for cleaning and cutting at the temperature, and then charging for heating and rolling. The steel grade of the Cr-Mo steel is 12Cr2MoR and 12Cr2Mo1VR formed by steel ingots. The process is simple in process, the surface and internal quality of the blank after slow cooling is excellent, generation of blank cracks is reduced, the surface and internal quality of the steel plate rolled after the blank is charged at the temperature is good, and the flaw detection qualification rateis increased to 98% from 95%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Cr-Mo steel billet blanking and slow cooling process. Background technique [0002] Cr-Mo series steels for pressure vessels, especially for 12Cr2Mo1R and 12Cr2Mo1VR series steels, because the steel contains high alloying elements Cr, Mo, and V at the same time, during the cooling process of the billet after billeting, as the temperature continues to decrease, the internal and external The temperature difference is getting bigger and bigger. Due to the uneven cooling rate of each part, the internal and external temperature difference will further form thermal stress. If the internal stress is not annealed in time to eliminate the internal stress, surface defects or stress cracking will occur, even if the crack is not serious, it will affect production efficiency. , if the crack is severe, the billet will be scrapped. [0003] In view of the above problems, the p...

Claims

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Application Information

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IPC IPC(8): C21D1/84B22D30/00
CPCB22D30/00C21D1/84
Inventor 尹卫江李杰赵国昌龙杰庞辉勇袁锦程吴艳阳张剑王卓牛红星李样兵侯敬超顾自有王甜甜
Owner WUYANG IRON & STEEL
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