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 PDFInfo
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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
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%
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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