CN115287546A - 高压气瓶管用4130x钢及其冶炼连铸生产工艺 - Google Patents

高压气瓶管用4130x钢及其冶炼连铸生产工艺 Download PDF

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CN115287546A
CN115287546A CN202211132297.8A CN202211132297A CN115287546A CN 115287546 A CN115287546 A CN 115287546A CN 202211132297 A CN202211132297 A CN 202211132297A CN 115287546 A CN115287546 A CN 115287546A
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steel
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罗道侨
宗健
程晃
李立新
刘科
张章
李逍
刘兴
魏向军
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Henan Zhongyuan Special Steel Equipment Manufacturing Co Ltd
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Abstract

本发明属于炼钢技术领域，涉及一种高质量、高安全性的高压气瓶管用4130X钢及其冶炼连铸生产工艺,采用EAF～LF～VD～CC（立式连铸）的工艺路线，原料由废钢、钢屑、料头及高碳铬铁、高碳锰铁、硅铁、钼铁组成，电炉熔化钢铁料得到初炼钢水，经精炼炉调整合金成分，成分合适之后转VD脱气，脱气完成后转立式连铸浇钢，最后连铸坯经缓冷处理，得到质量更高、使用效果更好的高压气瓶管用4130X钢原始坯料，本工艺适用于立式连铸生产4130X高压气瓶管用钢。

Description

高压气瓶管用4130X钢及其冶炼连铸生产工艺
技术领域
本发明属于炼钢技术领域，涉及一种高质量、高安全性的高压气瓶管用4130X钢及其冶炼连铸生产工艺。
背景技术
4130X钢是一种典型的压力容器用钢，通常用作气瓶管运输压缩天然气、氢气等有风险的介质，因其使用环境及条件苛刻，对其化学成分及内部质量要求极为严苛。近年来，我国的天然气利用步入了新的发展时期，因此研发更高质量、更高安全性的气瓶管用4130X钢连铸圆坯具有重大意义。
发明内容
本发明的目的在于克服现有技术中存在的不足而提供一种精确控制4130X钢化学成分，在4130X钢冶炼过程及连铸过程选择合适的工艺参数，生产出质量更高、使用效果更好的高压气瓶管用4130X钢及其冶炼连铸生产工艺。
为了实现上述目的，本发明采用如下技术方案：
一种高压气瓶管用4130X钢，采用EAF～LF～VD～CC立式连铸工艺路线，按照质量百分比4130X钢包括如下成分：[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，有害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，另外控制微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，铸坯检测[H]≤2.0ppm、[O]≤25ppm、[N]≤70ppm；余量为铁。
一种高压气瓶管用4130X钢的冶炼连铸生产工艺，按照如下步骤进行生产：
步骤1）、在EAF炉内加入废钢320～360Kg/t、碳钢屑540～650Kg/t、碳料头200～240Kg/t作为钢铁料送电熔化，熔化期间加入增碳剂10～20Kg/t，熔清后加入白灰25～35Kg/t吹氧，吹氧量达到15m3/t流渣，温度≥1580℃取样，按照质量百分比出钢控制[C]≤0.10%，[P]≤0.005%，[Ni]≤0.18%，[Cu]≤0.20%，[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，控制出钢温度1630～1660℃，出钢过程中向钢包内加入铝块2～4kg/t、石灰4～7kg/t、硅铁1～2kg/t、高碳锰铁4～7kg/t、高碳铬铁8～12kg/t，出钢后转入LF炉；
步骤2）、LF炉就位接通氩气透气塞，调整氩气流量20～200Nl/min，加入白灰10～15Kg/t、电石1～2Kg/t、各占一半重量的碳粉和硅铁粉2～4Kg/t，送电20min取样，根据第一次取样结果，分批次加入2～3Kg/t硅铁调整Si含量，加入4～7Kg/t高碳锰铁调整Mn含量，加入7～11Kg/t高碳铬铁调整Cr含量，加入0.6Kg/t铝块调整Al含量，加入2～4Kg/t钼铁调整Mo含量，每批次调整合金之后送电15～20 min取样，每次送电期间加入各占一半重量的碳粉和硅铁粉2～4Kg/t脱氧，按照质量百分比控制[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%。温度1660～1680℃转入VD炉抽气，抽气前根据最后一次取样Al含量喂Al线，调整VD前Al:0.040～0.060%；
步骤3）、VD炉就位后接通氩气透气塞，调整氩气流量20～50Nl/min、测温1650～1670℃、扣VD炉罐盖，启动一级泵，间隔时间2～4min逐级启动二级泵、三级泵，真空度达到0.7mbar调整氩气流量100～150Nl/min，0.7mbar下保持时间≥20min，破空、抬盖，取样、定[H]、定[O]、取气体样检测[N]含量，按照质量百分比控制[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，五害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，定[H]≤1.5ppm、定[O]≤5ppm、气体样[N]≤60ppm，弱搅拌时间≥12min，首炉出钢温度1575～1585℃，连浇炉次出钢温度1565～1575℃，转立式连铸浇钢；
步骤4）、立式连铸浇钢，连铸中间包过热度20～40℃，设定拉速0.20m/min，结晶器水量3500L/min，二冷制度采用中冷，结晶器电搅参数：电流500A、频率5HZ，铸流电搅参数：电流200A、频率4HZ，使用E1-3保护渣；
步骤5）、出坯冷却，采用缓冷冷却制度。
本发明的技术方案产生的积极效果如下：一种高压气瓶管用4130X钢冶炼连铸生产工艺，采用EAF～LF～VD～CC（立式连铸）的工艺路线。原料为优质废钢、碳钢屑、碳料头等钢铁料及高碳铬铁、高碳锰铁、硅铁、钼铁组成。电炉熔化钢铁料得到[C]≤0.10%，[P]≤0.005%，[Ni]≤0.18%，[Cu]≤0.20%，[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%的初炼钢水，转精炼之后造渣、脱氧、脱硫、调整合金元素、调整温度，得到成分符合[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%的钢水，经VD脱气，去除钢液中的气体，最终得到成分符合[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，五害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，定[H]≤1.5ppm、定[O]≤5ppm、气体样[N]≤60ppm的终炼钢水，采用立式连铸成型，控制连铸中间包过热度20～40℃，设定拉速0.20m/min，结晶器水量3500L/min，二冷制度采用中冷，结晶器电搅参数：电流500A、频率5HZ，铸流电搅参数：电流200A、频率4HZ，使用E1-3保护渣、缓冷处理，最终得到成分、表面质量合格的连铸坯。本冶炼工艺适用立式连铸生产4130X钢，具有如下优点：（1）控制较低的[O]、[N]含量；（2）立式连铸有利于钢液夹杂物上浮，有利于提升连铸坯内部质量；（3）避免弧形连铸经拉矫机矫直产生矫直裂纹，可实现低拉速拉钢，更有利于连铸坯心部质量提升。（4）精准控制化学成分，提高气瓶用钢4130X使用性能。
具体实施方式
一种高压气瓶管用4130X钢及其冶炼连铸生产工艺，采用EAF～LF～VD～CC（立式连铸）的工艺路线，按照质量百分比4130X的成分如下：[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，有害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，另外控制微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，铸坯检测[H]≤2.0ppm、[O]≤25ppm、[N]≤70ppm，余量为铁。
冶炼工艺包括如下步骤：
步骤1）、在EAF炉内加入废钢320～360Kg/t、碳钢屑540～650Kg/t、碳料头200～240Kg/t作为钢铁料送电熔化，熔化期间加入增碳剂10～20Kg/t，熔清后加入白灰25～35Kg/t吹氧，吹氧量达到15m3/t流渣，温度≥1580℃取样，按照质量百分比出钢控制[C]≤0.10%，[P]≤0.005%，[Ni]≤0.18%，[Cu]≤0.20%，[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，控制出钢温度1630～1660℃，出钢过程中向钢包内加入铝块2～4kg/t、石灰4～7kg/t、硅铁1～2kg/t、高碳锰铁4～7kg/t、高碳铬铁8～12kg/t，出钢后转入LF炉。
步骤2）、LF就位接通氩气透气塞，调整氩气流量20～200Nl/min，加入白灰10～15Kg/t、电石1～2Kg/t、各占一半重量的碳粉和硅铁粉2～4Kg/t，送电20min取样，根据第一次取样结果，分批次加入2～3Kg/t硅铁调整Si含量，加入4～7Kg/t高碳锰铁调整Mn含量，加入7～11Kg/t高碳铬铁调整Cr含量，加入0.6Kg/t铝块调整Al含量，加入2～4Kg/t钼铁调整Mo含量，每批次调整合金之后送电15～20 min取样，每次送电期间加入各占一半重量的碳粉和硅铁粉2～4Kg/t脱氧，控制[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%。温度1660～1680℃转入VD炉抽气，抽气前根据最后一次取样Al含量喂Al线，调整VD前Al:0.040～0.060%。
步骤3）、VD炉就位后接通氩气透气塞，调整氩气流量20～50Nl/min、测温1650～1670℃、扣VD炉罐盖，启动一级泵，间隔时间2～4min逐级启动二级泵、三级泵，真空度达到0.7mbar调整氩气流量100～150Nl/min，0.7mbar下保持时间≥20min，破空、抬盖，取样、定[H]、定[O]、取气体样检测[N]含量，按照质量百分比控制[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，五害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，定[H]≤1.5ppm、定[O]≤5ppm、气体样[N]≤60ppm，弱搅拌时间≥12min，首炉出钢温度1575～1585℃，连浇炉次出钢温度1565～1575℃，转立式连铸浇钢。
步骤4）、立式连铸浇钢，连铸中间包过热度20～40℃，设定拉速0.20m/min，结晶器水量3500L/min，二冷制度采用中冷，结晶器电搅参数：电流500A、频率5HZ，铸流电搅参数：电流200A、频率4HZ，使用E1-3保护渣。
步骤5）、出坯冷却，采用缓冷冷却制度。
根据本实施例的冶炼工艺进行了四炉冶炼，四炉实施例冶炼得到的产品的化学成分含量表1中， 均符合目标要求：
表1 化学成分m%
Figure 378628DEST_PATH_IMAGE002
本冶炼工艺适用于立式连铸生产气瓶管用钢4130X冶炼。

Claims (2)

1.一种高压气瓶管用4130X钢，其特征在于：采用EAF～LF～VD～CC立式连铸工艺路线，按照质量百分比4130X钢包括如下成分：[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，有害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，另外控制微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，铸坯检测[H]≤2.0ppm、[O]≤25ppm、[N]≤70ppm；余量为铁。
2.一种高压气瓶管用4130X钢的冶炼连铸生产工艺，其特征在于：按照如下步骤进行生产：
步骤1）、在EAF炉内加入废钢320～360Kg/t、碳钢屑540～650Kg/t、碳料头200～240Kg/t作为钢铁料送电熔化，熔化期间加入增碳剂10～20Kg/t，熔清后加入白灰25～35Kg/t吹氧，吹氧量达到15m3/t流渣，温度≥1580℃取样，按照质量百分比出钢控制[C]≤0.10%，[P]≤0.005%，[Ni]≤0.18%，[Cu]≤0.20%，[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，控制出钢温度1630～1660℃，出钢过程中向钢包内加入铝块2～4kg/t、石灰4～7kg/t、硅铁1～2kg/t、高碳锰铁4～7kg/t、高碳铬铁8～12kg/t，出钢后转入LF炉；
步骤2）、LF炉就位接通氩气透气塞，调整氩气流量20～200Nl/min，加入白灰10～15Kg/t、电石1～2Kg/t、各占一半重量的碳粉和硅铁粉2～4Kg/t，送电20min取样，根据第一次取样结果，分批次加入2～3Kg/t硅铁调整Si含量，加入4～7Kg/t高碳锰铁调整Mn含量，加入7～11Kg/t高碳铬铁调整Cr含量，加入0.6Kg/t铝块调整Al含量，加入2～4Kg/t钼铁调整Mo含量，每批次调整合金之后送电15～20 min取样，每次送电期间加入各占一半重量的碳粉和硅铁粉2～4Kg/t脱氧，按照质量百分比控制[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，
温度1660～1680℃转入VD炉抽气，抽气前根据最后一次取样Al含量喂Al线，调整VD前Al:0.040～0.060%；
步骤3）、VD炉就位后接通氩气透气塞，调整氩气流量20～50Nl/min、测温1650～1670℃、扣VD炉罐盖，启动一级泵，间隔时间2～4min逐级启动二级泵、三级泵，真空度达到0.7mbar调整氩气流量100～150Nl/min，0.7mbar下保持时间≥20min，破空、抬盖，取样、定[H]、定[O]、取气体样检测[N]含量，按照质量百分比控制[C]:0.28～0.33%，[Si]:0.17～0.35%，[Mn]:0.75～0.90%，[P]≤0.015%，[S]≤0.008%，[P]+[S]≤0.020%，[Cr]:0.90～1.10%，[Mo]:0.20～0.25%，[Ni]≤0.18%，[Cu]≤0.20%，[Al]:0.020～0.045%，[Ti]≤0.015%，五害元素[As]、[Sn]、[Pb]、[Sb]、[Bi]均≤0.010%，且[As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.025%，微量元素[V]+[Nb]+[Ti]+[B]+[Zr]≤0.15%，定[H]≤1.5ppm、定[O]≤5ppm、气体样[N]≤60ppm，弱搅拌时间≥12min，首炉出钢温度1575～1585℃，连浇炉次出钢温度1565～1575℃，转立式连铸浇钢；
步骤4）、立式连铸浇钢，连铸中间包过热度20～40℃，设定拉速0.20m/min，结晶器水量3500L/min，二冷制度采用中冷，结晶器电搅参数：电流500A、频率5HZ，铸流电搅参数：电流200A、频率4HZ，使用E1-3保护渣；
步骤5）、出坯冷却，采用缓冷冷却制度。
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