ISSN：1003-8620

CN：42-1243/TF

主管：中信泰富特钢集团股份有限公司

主办：大冶特殊钢有限公司

特殊钢 ›› 2016, Vol. 37 ›› Issue (2): 36-38.

• 工艺技术 • 上一篇    下一篇

风电法兰用钢S355NL探伤缺陷的分析和工艺改进

闻小德，吕安明，刘利，刘兵   

  1. 山东钢铁股份有限公司莱芜分公司特钢事业部，莱芜 271105
  • 收稿日期:2015-10-20 出版日期:2016-04-01 发布日期:2022-08-08
  • 作者简介:闻小德(1985-)，男，硕士(东北大学)，工程师，2007年安徽工业大学(本科)毕业,轧钢技术与探伤工艺研究。

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

Wen Xiaode , Lii Anming , Liu Li , Liu Bing   

  1. Special Steel Business Division, Laiwu Branch, Shandong Iron and Steel Co Ltd, Laiwu 271105
  • Received:2015-10-20 Published:2016-04-01 Online:2022-08-08

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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,[H]为1.1×10-6~1.3×10-6,[O]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%。

关键词: 风电法兰用钢, S355NL, 超声波探伤, 裂纹, 工艺改进

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 10-6 , the [H]to 1.1 x 10-6-1.3 x 10-6 and the [O] to 12 x 10-6- 15 x 10-6 , 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%.

Key words: Steel Wind Power Flange, S355NL, Ultrasonic Nondestructive Examination, Cracks, Process Improvement

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