Analysis on Nondestructive Examination Defects of Steel S355NL for Wind Power Flange and Process Improvement

闻小德; 吕安明; 刘利; 刘兵

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Analysis on Nondestructive Examination Defects of Steel S355NL for Wind Power Flange and Process Improvement

更新时间：2026-01-21

- Analysis on Nondestructive Examination Defects of Steel S355NL for Wind Power Flange and Process Improvement
- Special Steel Vol. 37, Issue 2, Pages: 36-38(2016)
- 作者机构：
  
  山东钢铁股份有限公司莱芜分公司特钢事业部,莱芜,271105
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：20 October 2015，
  
  Online First：08 August 2022，
  
  Published：08 August 2016
- 稿件说明：
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闻小德, 吕安明, 刘利, et al. Analysis on Nondestructive Examination Defects of Steel S355NL for Wind Power Flange and Process Improvement[J]. Special Steel, 2016, 37(2): 36-38.
DOI：

闻小德, 吕安明, 刘利, et al. Analysis on Nondestructive Examination Defects of Steel S355NL for Wind Power Flange and Process Improvement[J]. Special Steel, 2016, 37(2): 36-38. DOI：

摘要

风电法兰用钢S355NL（/%:0.14~0.48C，0.15~0.40Si，1.30~1.60Mn，≤0.013P，≤0.005S，0.04~0.12V，0.03~0.05Nb，≤0.009Ti，≤0.30Cr，≤0.50Ni，≤0.20Cu，≤0.10Mo，≥0.020Alt）的冶金流程为100t UHP EAF—LF—VD—Φ650 mm

Φ800 mm坯CC工艺。该钢1~2 mm裂纹探伤不合格的分析结果表明

其主要原因为氧的铝类夹杂和铸坯疏松缺陷所致。通过在LF终点喂钙线0.45 kg/t

VD处理时间由原25 min增至27 min

降低钢中[N

]

至78×10

-6

~82×10

-6

]

为1.1×10

-6

~1.3×10

-6

]

为12×10

-6

~15×10

-6

软吹氩气流量由2×25L/min降至2×20 L/min

时间≥12 min

降低钢水过热度5℃等工艺措施

使铸坯锻造后的探伤合格率超过99%。

Abstract

The metallurgical flowsheet for steel S355NL for wind power flange (/% : 0.14-0.48C

0.15-0.40Si

1.30-1.60Mn

≤0.013P

≤0.005S

0.04-0.12V

0.03-0.05Nb

≤0.009Ti

≤0.30Cr

≤0.50Ni

≤0.20Cu

≤0.10Mo

≥0.020Alt) is 100t UHP EAF-LF-VD-Φ650 mm

Φ800 mm bloom CC process. The results of analysis on unqualified steel by nondestructive examination due to 1-2 mm cracks show that cracks are mainly caused by alumina inclusions and casting bloom porosity defects. By the process measures including feeding calcium wire 0.45 kg/t at end LF

increasing VD treading time to 27 min from original 25 min

decreasing the [N

]

in steel to 78 x 10

-6

-82 x

-6

the [H

]

1.1 x

-6

-1.3 x

-6

and the [O

]

to 12 x

-6

- 15 x

-6

decreasing the soft argon blowing rate to 2 x 20 L/min from 2 x 25 L/min

time≥12 min and decreasing the liquid overheating extent by 5℃

the qualified ratio of steel forged from casting bloom is more than 99%.

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