Development of Φ250 ~ 350 mm Casting Round Bloom of Steel P11 for High Pressure Boiler Pipe

尹修刚; 姚忠; 王社教

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Development of Φ250 ~ 350 mm Casting Round Bloom of Steel P11 for High Pressure Boiler Pipe

更新时间：2026-01-21

- Development of Φ250 ~ 350 mm Casting Round Bloom of Steel P11 for High Pressure Boiler Pipe
- Special Steel Vol. 37, Issue 6, Pages: 41-43(2016)
- 作者机构：
  
  1. 承德建龙特殊钢有限公司研发处,承德,067201
  2. 武汉钢铁集团鄂城钢铁有限责任公司,鄂州,436000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：03 July 2016，
  
  Online First：27 July 2022，
  
  Published：27 July 2016
- 稿件说明：
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尹修刚, 姚忠, 王社教. Development of Φ250 ~ 350 mm Casting Round Bloom of Steel P11 for High Pressure Boiler Pipe[J]. Special Steel, 2016, 37(6): 41-43.
DOI：

尹修刚, 姚忠, 王社教. Development of Φ250 ~ 350 mm Casting Round Bloom of Steel P11 for High Pressure Boiler Pipe[J]. Special Steel, 2016, 37(6): 41-43. DOI：

摘要

开发的P11钢（/%:0.08~0.14C

0.65~0.85Si

0.40~0.60Mn

≤0.010P

≤0.010S

1.10~1.30Cr

0.46~0.60Mo

≤0.015Alt）连铸圆坯的生产流程为KR铁水预处理-70 t顶底复吹转炉-LF-VD-圆坯连铸工艺。通过控制/%:0.09~0.11C

1.15~1.20Cr

0.07~0.08P

0.002~0.005S

0.008~0.015Als

中间包钢液温度（1538±5）℃

连铸拉速0.70~1.05 m/min

二次冷却比水量0.35~0.40 L/kg

矫直温度≥900℃

缓冷坑温度≥500℃等工艺措施

检验结果表明

铸坯表面质量合格

缩孔≤0.5级

中心疏松≤1.0级

钢P含量为0.007%~0.008%

S含量0.002%~0.005%

该钢在工作温度下有较好的耐流动加速腐蚀性（FAC）。

Abstract

The production flowsheet for developed casting round bloom of steel P11 (/% : 0. 08 ~ 0. 14C

0. 65 ~ 0. 85Si

0. 40 ~0. 60Mn

≤0. 010P

≤0. 010S

1. 10 ~ 1. 30Cr

0. 46 -0. 60Mo

≤0. 015Alt) is KR metal pretreatment- 70 t top and bottom combined blown converter- LF- VD- round bloom casting process. With using the measures including controlling the elements content /% : 0. 09 ~ 0. 11C

1.15~1. 20Cr

0. 07 ~ 0. 08P

0. 002 ~ 0. 005S and 0. 008 ~ 0. 015Als

controlling tundish liquid temperature (1538 ±5) ℃

casting speed 0. 70 ~ 1. 05 m/min

secondary cooling water ratio 0. 35 ~0. 40 L/kg

strengthening temperature ≥900 °C and temperature of slow cooling pit furnace ≥500 ℃，the examination results show that the surface quality of casting bloom is qualified with rating of shrinkage cavity ≤0. 5 and rating of central porosity ≤1. 0

the P content in steel is 0. 007% ~ 0. 008% and the S content in steel is 0. 002% ~ 0. 005%

so the steel has better flowing accelerating corrosion (FAC) resistance at service temperature.

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