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Production method of producing chromium-molybdenum steel plate made by steel ingot direct rolling molding

A production method and steel ingot technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems affecting the level of industrial development, hydrogenation reactors affecting energy utilization efficiency, etc., to avoid the phenomenon of internal cold and external heat, Effects of improving steel ingot quality and improving surface quality

Inactive Publication Date: 2020-10-20
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, from an energy point of view, the manufacturing level of a country's hydrogenation reactor will largely affect the country's energy utilization efficiency, which in turn will affect the level of industrial development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this example, the 12Cr2Mo1VR steel plate has a single weight of 15t, and its composition meets the requirements of GB / T 713-2014. The production steps are:

[0019] (1) Steel ingot pouring process: when the steel ingot is poured, the temperature of the ingot mold is 70°C, and a nozzle of 50mm is selected;

[0020] (2) Annealing process: After the steel ingot is cleaned, it is put into the furnace for high-temperature annealing. The annealing temperature is 930°C, and it is kept for 20 hours. The heating rate is 70°C / h, and the cooling rate is 50°C / h. Ensure the surface quality of steel ingots when they are heated and rolled in the furnace;

[0021] (3) Heating process: first heat preservation at 730°C for 6 hours, then heat preservation at 930°C for 2 hours; heat to 1280°C and heat preservation time for 15 hours, the furnace pressure is controlled at 0MPa; the steel ingot is turned over for 6 hours before rolling to ensure that the steel ingot is double uniform surf...

Embodiment 12

[0026] In this example, the 12Cr2Mo1VR steel plate has a single weight of 35t, and its composition meets the requirements of GB / T 713-2014. The production steps are:

[0027] (1) Steel ingot pouring process: when the steel ingot is poured, the temperature of the ingot mold is 60°C, and a nozzle of 50mm is selected;

[0028] (2) Annealing process: After the steel ingot is cleaned, it is put into the furnace for high-temperature annealing. The annealing temperature is 900°C, and it is kept for 24 hours. The heating rate is 50°C / h, and the cooling rate is 70°C / h. Ensure the surface quality of steel ingots when they are heated and rolled in the furnace;

[0029] (3) Heating process: During the heating process of the steel ingot, it is firstly kept at 680°C for 7 hours, and then kept at 890°C for 3 hours; heated to 1240°C for 18 hours, and the furnace pressure is controlled at 3MPa; the steel ingot is turned over for 4 hours before rolling. , to ensure uniform heating on both side...

Embodiment 3

[0034] In this example, the 12Cr2Mo1VR steel plate has a single weight of 17t, and its composition meets the requirements of GB / T 713-2014. The production steps are:

[0035] (1) Steel ingot pouring process: when the steel ingot is poured, the temperature of the ingot mold is 40°C, and a nozzle of 45mm is selected;

[0036] (2) Annealing process: After the steel ingot is cleaned, it is put into the furnace for high-temperature annealing. The annealing temperature is 920°C, and it is kept for 21 hours. The heating rate is 68°C / h, and the cooling rate is 63°C / h. Ensure the surface quality of steel ingots when they are heated and rolled in the furnace;

[0037] (3) Heating process: During the heating process of the steel ingot, it is firstly kept at 712°C for 6 hours, and then kept at 920°C for 2.3 hours; heated to 1259°C for 17 hours, and the furnace pressure is controlled at 2MPa; the steel ingot is turned over 5 hours before tapping and rolling Heating to ensure uniform heati...

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Abstract

The invention provides a production method of producing a chromium-molybdenum steel plate made by steel ingot direct rolling molding, and belongs to the technical field of metallurgy. The method comprises the processes of steel ingot pouring, annealing, heating, rolling and hot treatment; and the heating process comprises the steps of: (1) distressing step heating: a steel ingot is subjected to heat preservation at 680 to 730 DEG C for 6 to 7h, and then subjected to heat preservation at 890 to 930 DEG C for 2 to 3h; (2) low-temperature long-time heat preservation: the steel ingot is heated to1240 to 1280 DEG C and subjected to heat preservation for 15 to 18h, and the furnace pressure is controlled at 0 to 3MPa; and (3) before-tapping turn-over: the steel ingot is turned over and heated for 4-6h before being drawn out of a furnace. The steel plate produced is 15 to 35t in weight, the superficial quality of the steel plate is good, the grinding amount is low, and the flaw detection qualification rate is higher than or equal to 97%; and after high-temperature long-time die welding treatment, the high-temperature tensile yield strength of the steel plate at 454 DEG C is higher than orequal to 338MPa and the tensile strength is higher than or equal to 461MPa.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for directly rolling a steel ingot into a chromium-molybdenum steel plate. Background technique [0002] Cr-Mo steel plates for pressure vessels are often used in the manufacture of petrochemical equipment such as hydrogenation reactors due to their good high-temperature performance and hydrogen corrosion resistance. —Residual oil is converted into light oil by hydrogenation, so as to produce clean, environmentally friendly and energy-efficient petrochemical products such as gasoline and diesel. Therefore, from an energy point of view, the manufacturing level of a country's hydrogenation reactor will greatly affect the country's energy utilization efficiency, and then affect the level of industrial development. [0003] In order to improve the efficiency of energy use and the conversion rate of petroleum products, the petrochemical industry is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D9/00B21B1/22B21B45/02C21D1/26
CPCB21B1/224B21B45/0269C21D1/26C21D8/0205C21D8/021C21D8/0226C21D8/0247C21D9/0081
Inventor 李杰侯敬超龙杰庞辉勇袁锦程吴艳阳牛红星尹卫江李样兵王东阳顾自有赵紫娟
Owner WUYANG IRON & STEEL
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