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Method for producing large-thickness 12Cr2Mo1VR steel plate from forged billet

A 12cr2mo1vr, large-thickness technology, applied in the field of metallurgy, can solve the problems of high hardness, difficult production, and difficult production of 12Cr2Mo1VR steel plates

Inactive Publication Date: 2020-10-27
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The production of forged billet into 12Cr2Mo1VR steel plate is extremely difficult, mainly in the following aspects: 1) It is difficult to realize warm delivery and warm loading in the production process of forged billet, 12Cr2Mo1VR steel plate is crack sensitive steel, and the billet is prone to cracks or cracks; 2) 12Cr2Mo1VR The content of alloying elements is high, the hardness is high, forging and post-machining are more difficult; 3) 12Cr2Mo1VR billet is heavy, and rolling is more difficult; 4) The thickness of 12Cr2Mo1VR steel plate is large, and the performance of the steel plate after high temperature and long-term die welding is difficult to meet the standard value
[0005] To sum up, to overcome the difficulty of producing 12Cr2Mo1VR steel plates from forged billets, a method for producing large-thickness 12Cr2Mo1VR steel plates from forged billets has been developed, which will take advantage of the advantages of high density and excellent performance of forged products, improve the surface quality of steel plates, and control production cost, significant

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  • Method for producing large-thickness 12Cr2Mo1VR steel plate from forged billet

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Embodiment 1

[0024] In this embodiment, the forged billet is a 12Cr2Mo1VR steel plate with a thickness of 190mm and a unit weight of 45t.

[0025] The method for producing large-thickness 12Cr2Mo1VR steel plates from forged billets in this embodiment includes the steps of forging billet production, preheating annealing treatment, forging billet heating, forging billet rolling, and steel plate heat treatment, and the specific process steps are as follows:

[0026] 1. Forging billet production process:

[0027] (1) High-temperature annealing of forged ingots: After the forged ingots are smelted, high-temperature long-term annealing is carried out. The annealing temperature is 960°C, the temperature is kept for 48 hours, the heating rate is 60°C / h, the cooling rate is 50°C / h, and the temperature is lowered to 250°C for cleaning;

[0028] (2) Forging of forged ingot: the forged ingot is preheated at 650°C and held for 10 hours; then the temperature is raised to 1190°C at a rate of 80°C / h, held...

Embodiment 2

[0036] In this embodiment, the forged billet is a 12Cr2Mo1VR steel plate with a thickness of 170mm and a unit weight of 40t.

[0037]The method for producing large-thickness 12Cr2Mo1VR steel plates from forged billets in this embodiment includes the steps of forging billet production, preheating annealing treatment, forging billet heating, forging billet rolling, and steel plate heat treatment, and the specific process steps are as follows:

[0038] 1. Forging billet production process:

[0039] (1) High-temperature annealing of forged ingots: After smelting forged ingots, carry out high-temperature long-term annealing at an annealing temperature of 940°C, hold for 50 hours, heat up at a rate of 50°C / h, cool down at a rate of 40°C / h, and drop to 200°C for cleaning;

[0040] (2) Forging of forged ingots: the forged ingots are first preheated at 600°C and held for 14 hours; then the temperature is raised to 1160°C at a rate of 70°C / h, held for 11 hours, and the jaws are pressed ...

Embodiment 3

[0048] In this embodiment, the forged billet is a 12Cr2Mo1VR steel plate with a thickness of 179mm and a single weight of 42t.

[0049] The method for producing large-thickness 12Cr2Mo1VR steel plates from forged billets in this embodiment includes the steps of forging billet production, preheating annealing treatment, forging billet heating, forging billet rolling, and steel plate heat treatment, and the specific process steps are as follows:

[0050] 1. Forging billet production process:

[0051] (1) High-temperature annealing of forged ingots: After the forged ingots are smelted, high-temperature long-term annealing is carried out, the annealing temperature is 943°C, the temperature is kept for 48.6h, the heating rate is 53°C / h, the cooling rate is 48°C / h, and it is lowered to 248°C for cleaning;

[0052] (2) Forging of forged ingots: the forged ingots are preheated at 630°C and held for 12.9 hours; then the temperature is raised to 1173°C at a rate of 76°C / h, held for 9.7 ...

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Abstract

The invention discloses a method for producing a large-thickness 12Cr2Mo1VR steel plate from a forged billet. The method comprises the steps of forged billet production, forged billet heating, forgedbillet rolling and steel plate heat treatment, specifically, a forged ingot is subjected to high-temperature annealing treatment, and is forged twice to obtain the forged billet, and then preheating annealing and surface treatment are carried out; the forged billet is preheated before being charged, and then is charged with heat, wherein the charging temperature is 150 DEG C or above; a low-speedlarge-reduction rolling process is adopted in the steel plate rolling process; and a high-low pressure quenching and tempering process is adopted in the heat treatment. The thickness of the 12Cr2Mo1VRsteel plate produced by the method is 170-190 mm, the piece weight is 40-45 t, and the qualified rate of flaw detection is 97% or higher; the steel plate has good performance after long-term die welding at a high temperature, the yield strength is 450-520 MPa, the tensile strength is 620-670 MPa, and the impact power at minus 30 DEG C is 100 J or higher; and the surface grinding amount of the steel plate is 3-5%, and the production cost is reduced by 1500-2000 yuan per ton of steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing a large-thickness 12Cr2Mo1VR steel plate by forging a billet. Background technique [0002] Under the pressure of the ecological environment, the capacity and product upgrades of the petrochemical industry are imminent. In recent years, the petroleum and coal chemical industry has experienced a golden age. However, in order to respond to national policies and meet social needs, the development model of the petrochemical industry must be changed. The petrochemical industry needs It is developing towards large-scale equipment, high efficiency, energy saving and environmental protection, and resource integration. In order to meet equipment requirements, the performance requirements and specification requirements for petrochemical equipment steel are getting higher and higher. Due to the limitations of rolling mills and supporting equipment, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D1/18C21D6/00
CPCC21D1/18C21D6/002C21D8/0205C21D8/0226C21D8/0263
Inventor 龙杰郭为民陈崇刚侯敬超袁锦程吴艳阳牛红星尹卫江李样兵王东阳顾自有
Owner WUYANG IRON & STEEL