Heat Treatment, Structure and Properties of High-Strength-Toughness Steel 12Cr2Mo 406 mm x 40.5 nun Tube for High Pressure Boiler

张志成; 李永灯; 阮玲慧; 吴开明

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Heat Treatment, Structure and Properties of High-Strength-Toughness Steel 12Cr2Mo 406 mm x 40.5 nun Tube for High Pressure Boiler

更新时间：2026-01-21

- Heat Treatment, Structure and Properties of High-Strength-Toughness Steel 12Cr2Mo 406 mm x 40.5 nun Tube for High Pressure Boiler
- Special Steel Vol. 36, Issue 1, Pages: 52-55(2015)
- 作者机构：
  
  1. 湖北新冶钢有限公司产品研究所,黄石,435001
  2. 武汉科技大学国际钢铁研究院,武汉,430081
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：11 August 2014，
  
  Online First：30 August 2022，
  
  Published：30 August 2015
- 稿件说明：
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张志成, 李永灯, 阮玲慧, et al. Heat Treatment, Structure and Properties of High-Strength-Toughness Steel 12Cr2Mo 406 mm x 40.5 nun Tube for High Pressure Boiler[J]. Special Steel, 2015, 36(1): 52-55.
DOI：

张志成, 李永灯, 阮玲慧, et al. Heat Treatment, Structure and Properties of High-Strength-Toughness Steel 12Cr2Mo 406 mm x 40.5 nun Tube for High Pressure Boiler[J]. Special Steel, 2015, 36(1): 52-55. DOI：

摘要

试验用12Cr2Mo(/%:0.09C

0.30Si

0.34Mn

0.007P

0.006S

2.10Cr

0.93Mo

0.014Al)406 mm×40.5 mm钢管的生产流程为120tBOF-LF-RH-410mm×530mm连铸-锻制∞90mm管坯-460mmASSEL机组轧制成管。采用JMatPro软件计算实验用钢平衡相转变图

得出12Cr2Mo钢相变点Ac

为862℃

为781℃

并对910℃正火

700℃回火处理的试验钢进行组织和力学性能检验。结果表明

试验12Cr2Mo钢正火-回火后的基体组织为贝氏体+少量铁素体

同时大量不规则的M

碳化物在晶界和晶内析出

少量颗粒状的M

C碳化物沿晶界析出

大量细小针状的Mo

C碳化物在晶内析出

该钢力学性能优良-强度R

515~520 MPa

640~650 MPa

塑性A 22%~25%

Z 76%~80%

以及-60℃冲击功A

268~293 J。

Abstract

The production flow sheet for test steel 12Cr2Mo (/%: 0.09C

0. 30Si

0. 34Mn

0.007P

0. 006S

10Cr

0. 93Mo

0. 014A1) 406 mm x 40.5 mm tube is 120 t BOF-LF-RH-410 mm x 530 mm bloom casting-forging to 0390 mm tube stock-460 mm ASSEL mill rolling to tube. With using JMatPro software to calculate phase equilibrium diagram of test steel

it is obtained that the steel 12Cr2Mo phase transition point Ac

is 862 ℃; and the Ac

is 781 °C

and the examination on structure and mechanical properties of test steel normalizing-heat-treated at 910 °C and tempered at 700 ℃ has been carrie

d out. Results show that the matrix structure of normalized-tempered test steel 12Cr2Mo is bainite + minor ferrite

and a large amount of irregular M

precipitate at grain boundary and in intragranular

a small amount granular M6C carbides precipitate along grain boundary and a large amount fine pin-like Mo

C carbides precipitate in intragranular

and the mechanical properties of steel is excellent- strength /R

515 ~520 MPa and R

640 ~650 MPa

plasticity A 22% ~ 25% and Z 76% 80%

and impact energy at -60 TJ A

268 ~293 J.

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