Low-carbon low-alloy chromium-molybdenum pressure vessel steel plate and its heat treatment method

A pressure vessel and low alloy technology, applied in the field of steel plate manufacturing, can solve the problems of difficulty in taking into account production cost and product qualification rate, complex production process and high production cost, and achieve the effects of simple process, simplified production process and low cost.

Active Publication Date: 2022-02-15
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The rest of the relevant reports on 15CrMoR and 14Cr1MoR steels either did not involve high-temperature simulated post-weld heat treatment, or the production cost was high and the production process was complicated
In summary, the existing 15CrMoR and 14Cr1MoR steel production is difficult to take into account the production cost and product qualification rate

Method used

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  • Low-carbon low-alloy chromium-molybdenum pressure vessel steel plate and its heat treatment method
  • Low-carbon low-alloy chromium-molybdenum pressure vessel steel plate and its heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is a 15CrMoR steel plate with a thickness of 25 mm. The chemical composition of the steel plate is: C=0.14, Cr: 0.87, Mo: 0.48, Mn: 0.44, Si: 0.23, P: 0.01, S : 0.0019, Alt: 0.036, Sn: 0.003, As: 0.0066, Sb: 0.0018, the balance is Fe and unavoidable impurity elements, tempering embrittlement coefficient X: 12.8ppm, tempering embrittlement coefficient calculation formula is: X =(10P+5Sb+4Sn+As)×10 -2 .

[0028] The heat treatment method of the steel plate includes normalizing and tempering processes, and the specific process steps are as follows:

[0029] Normalizing: put the steel plate into the furnace at room temperature, and heat it up to 910°C with the furnace temperature rising. After the furnace temperature rises to 910°C, heat preservation starts. The heat preservation time coefficient is 2.2min / mm. After heat preservation, it is taken out of the furnace and air-cooled;

[0030] Tempering: The steel plate is put into the furnace at room temperature...

Embodiment 2

[0033] This embodiment is a 15CrMoR steel plate with a thickness of 28.5 mm. The chemical composition of the steel plate is as follows in terms of mass percentage (wt, %): C=0.15, Cr: 0.98, Mo: 0.46, Mn: 0.52, Si: 0.23, P: 0.01, S: 0.0025, Alt: 0.029, Sn: 0.003, As: 0.0067, Sb: 0.0018, the balance is Fe and unavoidable impurity elements, the tempering embrittlement coefficient X: 12.8ppm, the tempering embrittlement coefficient calculation formula is: X=(10P+5Sb+4Sn+As)×10 -2 .

[0034] The heat treatment method of the steel plate includes normalizing and tempering processes, and the specific process steps are as follows:

[0035] Normalizing: put the steel plate into the furnace at room temperature, and heat it up to 920°C with the furnace temperature rising. After the furnace temperature rises to 920°C, heat preservation starts. The heat preservation time coefficient is 2.2min / mm. After the heat preservation is completed, it is out of the furnace and air cooled;

[0036] T...

Embodiment 3

[0039] This example is a 32mm thick 15CrMoR steel plate. The chemical composition of the steel plate is: C=0.14, Cr: 1.03, Mo: 0.47, Mn: 0.53, Si: 0.24, P: 0.006, S : 0.0011, Alt: 0.03, Sn: 0.002, As: 0.006, Sb: 0.0019, the balance is Fe and unavoidable impurity elements, tempering embrittlement coefficient X: 11.4ppm, tempering embrittlement coefficient calculation formula is: X =(10P+5Sb+4Sn+As)×10 -2 .

[0040] The heat treatment method of the steel plate includes normalizing and tempering processes, and the specific process steps are as follows:

[0041] Normalizing: put the steel plate into the furnace at room temperature, and heat it up to 910°C with the furnace temperature rising. After the furnace temperature rises to 910°C, heat preservation starts. The heat preservation time coefficient is 2.2min / mm. After heat preservation, it is taken out of the furnace and air-cooled;

[0042] Tempering: The steel plate is put into the furnace at room temperature, and heated to ...

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Abstract

The invention discloses a low-carbon low-alloy chromium-molybdenum pressure vessel steel plate and a heat treatment method thereof. On the basis of using a simple and low-cost heat treatment process such as normalizing + tempering, the thickness and composition of the steel plate are dynamically controlled to finally obtain The high-quality steel plate can not only meet the performance requirements, but also simplify the production process and reduce the production cost. The invention is based on a simple heat treatment process: normalizing + tempering, and provides a dynamic control idea to control the dynamic structure through dynamic components and obtain good performance. The invention mainly relates to steel plates for low-carbon and low-alloy chromium-molybdenum pressure vessels, including the dynamic structure and component-controlled heat treatment process of 15CrMoR and 14Cr1MoR steels.

Description

technical field [0001] The invention relates to a steel plate for a low-carbon and low-alloy chromium-molybdenum pressure vessel, in particular to a steel plate for a low-carbon and low-alloy chromium-molybdenum pressure vessel and a heat treatment method thereof. It belongs to the technical field of steel plate manufacturing. Background technique [0002] Each series of steel grades has its composition range, which can be queried through relevant national standards. The composition of steel is an important inspection index for delivery. When steel factories produce products, the composition ratio must be strictly implemented in accordance with relevant national / industry standards. For Cr-Mo pressure vessel steel, its delivery state is usually tempered, and the pre-heat treatment process of tempering is quenching, normalizing or normalizing (accelerated cooling). Among them, the heat treatment process with the simplest process and the lowest cost For normalizing. Obviousl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/42C22C38/44C22C38/60C21D1/18C21D1/28C21D6/00C21D9/00
CPCC22C38/22C22C38/04C22C38/02C22C38/002C22C38/06C22C38/008C22C38/60C22C38/44C22C38/42C21D1/28C21D1/18C21D6/002C21D6/005C21D6/008C21D6/004C21D9/0081C21D2211/005C21D2211/009C21D2211/002
Inventor 许晓嫦罗登陈广兴徐琛李红英张勇伟赵明纯刘丹
Owner CENT SOUTH UNIV
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