CN113862549A - 一种l360qs输氢管线钢的生产方法 - Google Patents

一种l360qs输氢管线钢的生产方法 Download PDF

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CN113862549A
CN113862549A CN202111089004.8A CN202111089004A CN113862549A CN 113862549 A CN113862549 A CN 113862549A CN 202111089004 A CN202111089004 A CN 202111089004A CN 113862549 A CN113862549 A CN 113862549A
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李中平
周文浩
曹新举
张勇伟
陈炼
熊祥江
史术华
蔡大为
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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Abstract

一种L360QS输氢管线钢的生产方法，钢的化学成分百分含量为C=0.07%~0.10%、Si=0.20%~0.30%、Mn=0.80%~0.90%、P≤0.008%、S≤0.0015%、Alt=0.025%~0.035%、Nb=0.010%~0.020%、Ti=0.015%~0.020%、Cr=0.10~0.15%、B≤0.0005%、Pcm=0.16%~0.19%，余量为Fe和不可避免的杂质。按照该发明生产的正火L360QS钢，钢板性能均匀稳定，同板差在40MPa以内；屈服强度：380~420MPa；抗拉强度：480~560MPa；延伸率A50：45%~70%；屈强比≤0.75；‑40℃冲击300~400J；负30度落锤剪切面积比：85~100%。A溶液下抗HIC性能指标CLR、CTR、CSR均为0，在浓度10MPaH2实验下，断面收缩率＞60%，延伸率＞26%。

Description

一种L360QS输氢管线钢的生产方法
技术领域
本发明属于冶金技术领域，涉及一种L360QS输氢管线钢的生产方法。
背景技术
氢能作为一种零碳高效新能源，将在全球能源新格局中扮演重要角色，氢能将成为第三次能源变革的重要媒介。占世界GDP80%的国家近年纷纷出台政策大力支持氢能产业发展，美国、日本等许多国家和地区相继制定了氢能发展战略或规划。
氢能储运作为制氢与用氢之间的纽带和桥梁，对整个氢能产业链的持续发展至关重要。氢能储运将成为制约产业规模化发展的重要因素，管道运氢是未来大规模输送的首选，管输成本远低于其他方式。因此，氢气管道建设急需特种钢材，开发适应氢气管道运输的管线钢成为当前的重要任务。
发明内容
本发明旨在提供一种L360QS输氢管线钢的生产方法，以解决现有纯氢、掺氢管道输送用钢板的关键技术，采用淬火+回火的生产工艺，钢板具有良好的强度与低温韧性，性能均匀稳定，A溶液下抗HIC性能指标CLR、CTR、CSR均为0，尤其是钢板在浓度10MPaH2实验下，断面收缩率＞60%，延伸率＞26%，该工艺下，L360QS抗H2氢脆性能优异。
本发明的技术方案：
一种L360QS输氢管线钢的生产方法，钢的化学成分重量百分比为C=0.07%~0.10%、Si=0.20%~0.30%、Mn=0.80%~0.90%、P≤0.008%、S≤0.0015%、Alt=0.025%~0.035%、Nb=0.010%~0.020%、Ti=0.015%~0.020%、Cr=0.10~0.15%、B≤0.0005%、Pcm=0.16%~0.19%，余量为Fe和不可避免的杂质；包括以下工艺步骤：
（1）炼钢：采用LF与RH组合钢水处理，LF在站处理时间＞55min，渣量＞15kg/t，钙化处理喂入纯钙线330~370m，出站S含量≤0.0015%，VD保真空时间＞18min，软吹＞20min，LF造高碱度还原渣，RH真空脱气促进夹杂物充分上浮，S含量＜0.0015%；
（2）连铸：全程保护浇铸，过热度控制在8~12℃，拉速控制在0.7~0.8m/min，冷却模式采用强冷工艺，二冷配水量控制在0.45~0.60L/kg，板坯低倍C类偏析≤0.5级；
（3）轧制：加热温度1200~1250℃，加热时间190~240min，待温坯厚度＞4h，开轧温度880~930℃，终轧温度790~820℃，精轧后不打水，空冷至室温；
（4）调质：淬火工艺890℃，保温时间1.5×h+15min，淬火辊速0.3~0.5m/s，回火工艺保温660~680℃，保温时间2.5×h+28~32min。
本发明钢包炉造高碱度、高流动性渣进行深脱硫处理，Ca0含量控制在55%-65%，SiO2控制在5%-10%，Al2O3控制在20%-30%，MgO控制5%-7%之间，MnO+Fe0含量＜1.2%，并使用适量高铝预溶渣，硫含量能稳定控制在0.0015%，B含量能稳定控制在4ppm以内，同时渣系具有良好的夹杂物吸附能力，分阶段钙化处理，VD真空时间延长至18分钟，破空后软吹时间不低于20分钟等手段，进一步促进夹杂物充分上浮，钢水B、D类夹杂物实际控制在1.0级以内，氮含量能控制在33ppm。采用中低碳锰+微Nb/ Ti+Cr成分体系，合金成本低，配合合适的控制轧制+离线调质工艺，既能保证钢板具备足够的强度，又能良好的低温韧性，尤其是大幅提高材料抗H2氢脆性能。
按照该发明生产的调质L360QS钢，钢板性能均匀稳定，同板差在40MPa以内；屈服强度380~420MPa，抗拉强度480~560MPa，延伸率A50=45%~70%，屈强比≤0.85，-40℃冲击300~400J，负30度落锤剪切面积比为85%~100%。A溶液HIC实验下，CLR、CTR、CSR均为0，在浓度10MPaH2实验下，断面收缩率＞60%，延伸率＞26%。
附图说明
图1为实施例1的钢板金相组织图。
图2为为实施例1的钢板落锤断口形貌图。
具体实施方式
下面结合实施例进一步说明本发明的内容。
实施例一：16mmL360QS管线钢的生产方法
L360QS钢的化学成分含量C=0.09 %、Si=0.26%、Mn=0.86%、P=0.003%、S=0.0008%、Alt=0.028%、Nb=0.013%、Ti=0.016%、Cr=0.12%、B=0.0003%、Pcm=0.17%，余量为Fe和不可避免的杂质。
（1）炼钢：采用LF与RH组合钢水处理，LF在站处理时间58min，渣量18kg/t，钙化处理喂入纯钙线362m，中间间隔12s喂入，出站S含量0.0014%。VD保真空时间22min，软吹按25min，LF造高碱度还原渣，RH真空脱气促进夹杂物充分上浮，控制S＜0.0012%。
（2）连铸：全程保护浇铸，过热度控制9℃，拉速控制在0.76m/min，冷却模式采用强冷工艺，二冷配水量控制在0.52L/kg，板坯低倍C类偏析0.5级。
（3）轧制：加热温度1205~1240℃，加热时间200~220min，待温坯厚度70mm，开轧温度920℃，终轧温度811℃，精轧后不打水，空冷至室温。
（4）调质：淬火工艺890℃，保温时间39min，淬火辊速0.36m/s，回火工艺670℃，保温时间70min。
表1 16mmL360QS力学性能
Figure 657650DEST_PATH_IMAGE002
。
SSC采用ASTM G39 在NACE TM0177-2016标准A溶液中进行4点弯曲试验，价值应力为钢板实际屈服强度的80%，表面未出现裂纹，HIC按照NACE TM0284标准A溶液进行试验，CLR、CTR、CSR均为0。
实施例二：21mmL360QS管线钢的生产方法
钢的化学成分含量C=0.08%、Si=0.28%、Mn=0.88%、P=0.004%、S=0.0010%、Alt=0.030%、Nb=0.016%、Ti=0.018%、Cr=0.14%、B=0.0002%、Pcm=0.16，余量为Fe和不可避免的杂质。
（1）炼钢：采用LF与RH组合钢水处理，LF在站处理时间62min，渣量16kg/t，钙化处理喂入纯钙线360m，中间间隔15s喂入，出站S含量0.0012%控制。VD保真空时间20min，软吹按25min控制，LF造高碱度还原渣，RH真空脱气促进夹杂物充分上浮，控制S含量＜0.0011%。
（2）连铸：全程保护浇铸，过热度控制9℃，拉速控制在0.76m/min，冷却模式采用强冷工艺，二冷配水量控制在0.55L/kg，板坯低倍C类偏析0.5级。
（3）轧制：加热温度1210~1230℃，加热时间231min，待温坯厚度80mm，开轧温度885℃，终轧温度800-810℃，精轧后不打水，空冷至室温。
（4）调质：淬火工艺890℃，保温时间45min，淬火辊速0.35m/s，回火工艺670℃，保温时间80min。
表2 21mmL360QS力学性能
Figure 940864DEST_PATH_IMAGE004
。
SSC采用ASTM G39 在NACE TM0177-2016标准A溶液中进行4点弯曲试验，价值应力为钢板实际屈服强度的80%，表面未出现裂纹。HIC按照NACE TM0284标准A溶液进行试验，CLR、CTR、CSR均为0。

Claims (1)

1.一种L360QS输氢管线钢的生产方法，其特征在于：钢的化学成分重量百分比为C=0.07%~0.10%、Si=0.20%~0.30%、Mn=0.80%~0.90%、P≤0.008%、S≤0.0015%、Alt=0.025%~0.035%、Nb=0.010%~0.020%、Ti=0.015%~0.020%、Cr=0.10~0.15%、B≤0.0005%、Pcm=0.16%~0.19%，余量为Fe和不可避免的杂质；包括以下工艺步骤：
（1）炼钢：采用LF与RH组合钢水处理，LF在站处理时间＞55min，渣量＞15kg/t，钙化处理喂入纯钙线330~370m，出站S含量≤0.0015%，VD保真空时间＞18min，软吹＞20min，LF造高碱度还原渣，RH真空脱气促进夹杂物充分上浮，S含量＜0.0015%；
（2）连铸：全程保护浇铸，过热度控制在8~12℃，拉速控制在0.7~0.8m/min，冷却模式采用强冷工艺，二冷配水量控制在0.45~0.60L/kg，板坯低倍C类偏析≤0.5级；
（3）轧制：加热温度1200~1250℃，加热时间190~240min，待温坯厚度＞4h，开轧温度880~930℃，终轧温度790~820℃，精轧后不打水，空冷至室温；
（4）调质：淬火工艺890℃，保温时间1.5×h+15min，淬火辊速0.3~0.5m/s，回火工艺保温660~680℃，保温时间2.5×h+28~32min。
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