CN114196881B - 一种兼具低温焊接和高热输入焊接性能的高强度钢及其生产方法 - Google Patents
一种兼具低温焊接和高热输入焊接性能的高强度钢及其生产方法 Download PDFInfo
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Abstract
一种兼具低温焊接和高热输入焊接性能的高强度钢及其生产方法,属于钢铁生产技术领域。该高强度钢的化学成分按质量分数包括:C:0.03~0.16%,Si:0.05~0.5%,Mn:1.0~1.9%,P:0.002~0.02%,S:0.001~0.01%,Al:0.005~0.07%,Ti:0.005~0.04%,Cr:0.1~0.5%,B:0.0005~0.005%,Mg+Zr:0.002~0.01%,O:0.001~0.008%,N:0.004~0.01%,余量为Fe和残余元素。添加镁、锆以形成镁/锆氧化物,添加钛、硼以形成钛/硼氮化物,两种类型析出物协同发挥作用,起到改善热影响区组织的作用;并针对现有高强度钢成分和生产过程进行优化,在目前已有生产技术下,通过调整合金成分与冶炼工艺,对多种氮化物和氧化物的数目与形态均进行控制,实现在具低温焊接性能的同时,兼顾高热输入焊接性能。
Description
技术领域
本发明属于钢铁生产技术领域,特别涉及一种兼具低温焊接和高热输入焊接性能的高强度钢及其生产方法。
背景技术
近些年,随着各种工程建设向大型化发展,焊接结构不断向高参数、大型化、重型化方向发展,对钢材的焊接性能提出了越来越高的要求。在大型结构的制造过程中,由于结构形式复杂,需要采用不同的焊接方法,并进行多次焊接,焊接部位的预热对制造过程带来极大不便,因此对降低预热温度或免除预热具有显著需求。同时,用高效多丝埋弧焊、气电立焊等高热输入大线能量焊接技术,取代传统的焊接工艺,可以达到提高焊接效率,缩短工期的目的。无论是降低预热温度进行低温焊接还是采用高热输入大线能量焊接,焊接部位的性能都会出现明显的下降。此外,为了实现高强度钢的生产通常需要添加含量较高的Mo、Mn、Cr等合金元素予以实现,这又导致冷裂纹敏感系数Pcm值较高,这与工程建设中出于简化施工程序和降低工程造价的考虑,一般希望不预热或低预热焊接的意愿相违背。因而,目前迫切地需要可兼具低温焊接和高热输入焊接性能的高强度钢,以满足市场与工程的需要。
公开号为CN110541117A的发明专利公开一种低预热温度焊接的620MPa级高性能桥梁钢及其制备方法,其特点是通过低碳设计,Nb-Ti微合金化,控制P、S含量,利用Ca控制钢中夹杂物数量、形态,以同时满足对强度级别和预热温度的需求。但是该技术方案仅能实现低预热温度焊接,还无法进一步提高焊接热输入。
公开号为CN103422021A的发明专利公开一种屈服强度≥550MPa的低屈强比结构用钢及其生产方法,其特点是控制Mg的含量,使Mg和Als与[O]结合形成细小的氧化物颗粒,而TiN以其为形核核心依附于这些氧化物表面析出细小的复杂颗粒,细化基材和热影响区组织,以实现焊接过程免预热的目的。但该方案没有对氧化物和氮化物的分布进行优化控制,不能兼具免预热焊接和高热输入大线能量焊接。
公开号为CN111748737A的发明专利公开了一种冷裂纹敏感系数≤0.25的易焊接超高强钢及生产方法,其特点是过Ti析出强化保证钢的强度,后续通过回火进一步促使TiN和TiC粒子析出,进而在焊接时阻止热影响区晶粒长大,改善焊接性能。该方案采用单独的Ti析出强化技术,对各种不同焊接条件下的组织性能调控能力不足。
公开号为CN109628827A的发明专利公开了一种低温焊接裂纹敏感性高强度钢板HYQ620及其生产方法,其特点是通过适当调整C、Mo、Nb等合金元素含量和比例,严格控制钢中P、S等影响钢板韧性的有害元素含量,以保证钢材的低温焊接裂纹敏感性。该方案仅通过调整元素含量,无法实现兼具低温焊接和高热输入焊接性能。
根据现有技术可知,提高钢材低温焊接性能主要是通过对合金成分的优化,以获得低的冷裂纹敏感系数实现的,但使用该种技术手段的钢材缺少应对大线能量焊接过程中热影响区组织性能恶化的手段,难以满足行业对高热输入焊接性能的需要。通过对合金成分的优化,并结合对氧化物型或氮化物型粒子的引入,能实现在具有低温焊接性能的同时,兼顾一定的高热输入焊接性能。但现有技术中所引入的粒子种类单一,对热影响区的性能调控能力有限,难以满足实际应用中各种焊接条件下的性能需求。
发明内容
针对现有技术的不足,本发明是提供了一种兼具低温焊接和高热输入焊接性能的高强度钢及其生产方法,该方法针对现有高强度钢成分和生产过程进行优化,在目前已有生产技术下,通过调整合金成分与冶炼工艺,对多种氮化物和氧化物的数目与形态均进行控制,实现在具低温焊接性能的同时,兼顾高热输入焊接性能。
为实现上述目的,本发明采取如下技术方案:
本发明的一种兼具低温焊接和高热输入焊接性能的高强度钢,其化学成分按质量分数包括:C:0.03~0.16%,Si:0.05~0.5%,Mn:1.0~1.9%,P:0.002~0.02%,S:0.001~0.01%,Al:0.005~0.07%,Ti:0.005~0.04%,Cr:0.1~0.5%,B:0.0005~0.005%,Mg+Zr:0.002~0.01%,O:0.001~0.008%,N:0.004~0.01%,余量为Fe和残余元素;
所述钢材中含有氮化钛或氮化硼的化合物记为钛/硼氮化物,含有氧化镁或氧化锆的化合物记为镁/锆氧化物;钢中尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b个/mm2;在钢材基材中,a和b满足关系式10<a/b<100和104<a+10b<105;在钢材焊接热影响区中,a和b满足关系式5<a/b<50和104<2a+10b<105。
所述钢材的化学成分按质量分数还包括:Mo:0.1~0.5%,Ni:0.1~0.5%,Cu:0.1~0.5%,Nb:0.01~0.06%,V:0.01~0.06%中的一种或几种。
所述的钢材基材中,按颗粒数量计,3~30%的所述尺寸在0.2~2μm的镁/锆氧化物上同时附有钛/硼氮化物。
所述钢材在预热温度低于100℃、焊接热输入为5~50kJ/cm的条件下,以及预热温度低于50℃、焊接热输入为50~500kJ/cm的条件下,焊接热影响区-40℃冲击韧性≥47J。
本发明的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,包括以下工艺步骤:
步骤1、制线:
将钛、硼、镁、锆的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;
所述合金包芯线的芯料重量为200~500g/m,外径为9~16mm,钢带厚度0.3~0.6mm;
所述合金包芯线的芯料化学成分按质量分数包括:Ti:20~45%、Mg+Zr:5~30%、B:1~10%、N:1~15%、O:1~10%、Fe:1~50%、Si:1~50%、Mn:1~50%和残余元素;
将所述合金包芯线安装至精炼站的喂线机上;
步骤2、炼钢:
将铁水和/或废钢利用转炉或电炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;
钢包运送至精炼站精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;
在钢水的溶解氧达到<0.001wt%、溶解氮达到<0.004wt%后,喂入所述合金包芯线;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;
钢水进行全保护浇铸,得到铸坯;
步骤3、轧制:
铸坯直接送入轧机轧制,或者铸坯热装或冷装入加热炉加热;铸坯加热温度1150~1300℃,加热时间30~300min;
加热后的铸坯送入轧机轧制;轧机初轧温度1100~1250℃,终轧温度750~1100℃;轧制后的钢材冷却至室温;
得到兼具低温焊接和高热输入焊接性能的高强度钢。
所述的步骤1中,将钛、硼的合金进行增氮处理,将镁、锆的合金进行增氧处理,两者混合后制成包芯线,或者分别制成包芯线,应用于所述步骤2中。
所述的步骤2中,钢水的精炼方法为LF、RH、VD中的一种或几种或其他钢水精炼方法。
所述的步骤2中,合金包芯线的喂入速度为100~200m/min。
所述的步骤2中,在喂入合金包芯线之后,钢水进行底吹氩气3min以上。
所述的步骤3中,轧制后的钢材进行在线控制冷却或离线热处理。
本发明技术方案的技术原理和设计思想是:
现有改善高强度钢焊接性的技术主要是通过对合金成分的优化,并结合对氧化物型或氮化物型粒子的引入,来改善热影响区组织,实现免预热或低温预热焊接,或者实现高热输入大线能量焊接。但现有的技术中所利用的夹杂物种类单一,并且无法进行优化控制,对热影响区组织改善有限,难以满足不同焊接方法的需要。针对这一问题,本发明通过对合金成分和冶炼过程中的改进,在钢中引入多种类型的氮化物型与氧化物型夹杂物,并对各夹杂物的尺寸与比例进行控制,使其在焊接过程中起到更强的组织改善效果,以满足不同焊接工艺的需要。
本发明通过碳、硅、锰、铬等较廉价合金元素的组合保证钢材的基本强度;利用钼、镍、铜、钒、铌等合金元素的组合进一步提高钢材的强度,使其达到高强度钢的性能要求;添加镁、锆以形成镁/锆氧化物,添加钛、硼以形成钛/硼氮化物,两种类型析出物协同发挥作用,起到改善热影响区组织的作用,使高强钢兼具低温焊接和高热输入焊接性能。为了使夹杂物的钉扎细化效果得到最大程度发挥,通过大量实验研究,明确了各夹杂物的有效类型、最佳尺寸和数量范围,并限定了关键夹杂物含量的匹配关系,其含量满足特定关系式时,将最佳的热影响区组织韧化的效果。通过生产过程中对关键工艺和参数的控制,将稳定获得所述的目标氮化物和氧化物分布,达到本发明的目的。
本发明的优点及有益效果:
1、本发明通过氮化物与氧化物的协调作用,使钢材焊接热影响区获得更强的组织调控能力,可显著细化热影响区组织,提高焊接部位力学性能及综合性能,从而同时具备低温焊接和高热输入焊接性能。
2、现有技术中往往采用单一的氮化物或氧化物粒子,并且控制难度大,对焊接性能改善作用有限,不利于推广应用。而本发明能够提高焊接性能显著,能够满足不同焊接工艺要求,并且降低了工艺控制难度,有利于技术实施,可满足工程建设中对兼具低温焊接和高热输入焊接性能的高强度钢的迫切需要。
附图说明
图1为本发明实施例2中兼具低温焊接和高热输入焊接性能的高强度H型钢在不进行预热、焊接热输入为30kJ/cm的条件下的焊接热影响区光学显微组织照片。由图可知,焊接热影响区组织得到显著细化,焊接性能显著改善。
具体实施方式
下面通过实施例详细介绍本发明方案的具体实施方式,但本发明的保护范围不局限于实施例。
实施例1
本实施例中,兼具低温焊接和高热输入焊接性能的高强度钢板,其化学成分按质量分数包括:C:0.03%,Si:0.2%,Mn:1.9%,P:0.002%,S:0.0015%,Al:0.02%,Ti:0.02%,Mg+Zr:0.005%,O:0.004%,N:0.004%,余量为Fe和残余元素;在钢材基材中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量为a=32000个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量为b=2100个/mm2,a和b满足关系式10<a/b<100和104<a+10b<105。
上述钢材制备方法包括以下工艺步骤:将钛、硼、镁、锆的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;合金包芯线的芯料重量为300g/m,外径为10mm,钢带厚度0.3mm;合金包芯线的芯料化学成分按质量分数包括:Ti:20%、Mg+Zr:20%、B:5%、N:3%、O:6%、Fe:15%、Si:15%、Mn:12%和残余元素;将所述合金包芯线安装至精炼站的喂线机上;
将铁水利用转炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;钢包运送至精炼站进行LF精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;在钢水的溶解氧达到0.0003wt%、溶解氮达到0.0025wt%后,喂入所述合金包芯线,喂入速度为100m/min,并底吹氩气3min;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;钢水进行全保护浇铸,得到铸坯;
铸坯热装加热炉加热;铸坯加热温度1150℃,加热时间60min;加热后的铸坯送入钢板轧机轧制;轧机初轧温度1100℃,终轧温度780℃;轧制后的钢材冷却至室温;得到兼具低温焊接和高热输入焊接性能的高强度钢板。
所述钢板在预热温度为50℃、焊接热输入为15kJ/cm的条件下,焊接热影响区-40℃冲击韧性为240J;在不预热、焊接热输入为300kJ/cm的条件下,焊接热影响区-40℃冲击韧性为270J。在钢材15kJ/cm焊接热影响区中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a=24000个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b=1300个/mm2;a和b满足关系式5<a/b<50和104<2a+10b<105。
实施例2
本实施例中,兼具低温焊接和高热输入焊接性能的高强度钢,其化学成分按质量分数包括:C:0.16%,Si:0.2%,Mn:1.6%,P:0.004%,S:0.002%,Al:0.02%,Ti:0.015%,Cr:0.2%,B:0.0015%,Mg+Zr:0.008%,O:0.003%,N:0.006%,Mo:0.1%,余量为Fe和残余元素;在钢材基材中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量为a=34500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量为b=2600个/mm2,a和b满足关系式10<a/b<100和104<a+10b<105;按颗粒数量计,15%的所述尺寸在0.2~2μm的镁/锆氧化物上同时附有钛/硼氮化物。
上述钢材制备方法包括以下工艺步骤:将钒、钛、镁、钙的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;合金包芯线的芯料重量为400g/m,外径为12mm,钢带厚度0.5mm;合金包芯线的芯料化学成分按质量分数包括:V:25%、Ti:15%、Mg+Ca:10%、N:16%、O:3%、Fe:15%、Si:8%、Mn:5%和残余元素;将所述合金包芯线安装至精炼站的喂线机上;
将铁水和废钢利用电炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;钢包运送至精炼站进行RH精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;在钢水的溶解氧达到0.0002wt%、溶解氮达到0.003wt%后,喂入所述合金包芯线,喂入速度为120m/min,并进行底吹氩气4min;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;钢水进行全保护浇铸,得到铸坯;
铸坯冷装入加热炉加热;铸坯加热温度1300℃,加热时间90min;加热后的铸坯送入H型钢轧机轧制;轧机初轧温度1250℃,终轧温度1100℃;轧制后的钢材冷却至室温;得到兼具低温焊接和高热输入焊接性能的高强度H型钢。
所述H型钢在不进行预热、焊接热输入为30kJ/cm的条件下,焊接热影响区-40℃冲击韧性为160J;在预热温度为45℃、焊接热输入为120kJ/cm的条件下,焊接热影响区-40℃冲击韧性为230J。在钢材120kJ/cm焊接热影响区中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a=19500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b=1600个/mm2;a和b满足关系式5<a/b<50和104<2a+10b<105。
实施例3
本实施例中,兼具低温焊接和高热输入焊接性能的高强度钢,其化学成分按质量分数包括:C:0.07%,Si:0.4%,Mn:1.3%,P:0.002%,S:0.004%,Al:0.03%,Ti:0.02%,Cr:0.3%,B:0.0035%,Mg+Zr:0.006%,O:0.006%,N:0.008%,Cu:0.2%,Mo:0.1%,余量为Fe和残余元素;在钢材基材中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量为a=42500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量为b=3500个/mm2,a和b满足关系式10<a/b<100和104<a+10b<105;按颗粒数量计,25%的所述尺寸在0.2~2μm的镁/锆氧化物上同时附有钛/硼氮化物。
上述钢材制备方法包括以下工艺步骤:将钒、钛、镁、钙的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;合金包芯线的芯料重量为500g/m,外径为16mm,钢带厚度0.4mm;合金包芯线的芯料化学成分按质量分数包括:Ti:45%、Mg+Zr:12%、B:8%、N:3%、O:6%、Fe:20%、Si:1%、Mn:1%和残余元素;将所述合金包芯线安装至精炼站的喂线机上;
将铁水和废钢利用转炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;钢包运送至精炼站进行LF-RH精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;在钢水的溶解氧达到0.0005wt%、溶解氮达到0.0025wt%后,喂入所述合金包芯线,喂入速度为150m/min,进行底吹氩气14min;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;钢水进行全保护浇铸,得到铸坯;
铸坯热装入加热炉加热;铸坯加热温度1250℃,加热时间120min;加热后的铸坯送入中厚板轧机轧制;轧机初轧温度1200℃,终轧温度1050℃,钢板厚度52mm;轧制后的钢材冷却至室温,然后进行900℃正火热处理;得到兼具低温焊接和高热输入焊接性能的高强度钢板。
所述钢板在预热温度低为80℃、焊接热输入为5kJ/cm的条件下,焊接热影响区-40℃冲击韧性为220J;在不预热、焊接热输入为500kJ/cm的条件下,焊接热影响区-40℃冲击韧性为180J。在钢材500kJ/cm焊接热影响区中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a=27500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b=2600个/mm2;a和b满足关系式5<a/b<50和104<2a+10b<105。
实施例4
本实施例中,兼具低温焊接和高热输入焊接性能的高强度钢板,其化学成分按质量分数包括:C:0.05%,Si:0.5%,Mn:1.9%,P:0.006%,S:0.003%,Al:0.01%,Ti:0.04%,Cr:0.3%,B:0.003%,Mg+Zr:0.01%,O:0.008%,N:0.008%,V:0.1%,Nb:0.1%,余量为Fe和残余元素;钢中尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量为46500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量为3400个/mm2,按颗粒数量计,8%的所述尺寸在0.2~2μm的镁/锆氧化物上同时附有钛/硼氮化物。
上述钢材制备方法包括以下工艺步骤:将钒、钛、镁、钙的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;合金包芯线的芯料重量为250g/m,外径为14mm,钢带厚度0.6mm;合金包芯线的芯料化学成分按质量分数包括:Ti:30%、Mg+Zr:25%、B:8%、N:5%、O:6%、Fe:10%、Si:8%、Mn:13%和残余元素;将所述合金包芯线安装至精炼站的喂线机上;
将铁水和废钢利用电炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;钢包运送至精炼站进行LF-VD精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;在钢水的溶解氧达到0.0006wt%、溶解氮达到0.0035wt%后,喂入所述合金包芯线,喂入速度为200m/min,进行底吹氩气4min;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;钢水进行全保护浇铸,得到铸坯;
铸坯直接送入轧机轧制,终轧温度800℃;轧制后的钢材进行在线控制冷却至630℃,然后空冷至室温;得到兼具低温焊接和高热输入焊接性能的高强度钢板。
所述钢板在预热温度为90℃、焊接热输入为30kJ/cm的条件下,焊接热影响区-40℃冲击韧性为200J;在预热温度为40℃、焊接热输入为350kJ/cm的条件下,焊接热影响区-40℃冲击韧性为175J。在钢材350kJ/cm焊接热影响区中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a=27500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b=2400个/mm2;a和b满足关系式5<a/b<50和104<2a+10b<105。
实施例5
本实施例中,兼具低温焊接和高热输入焊接性能的高强度钢,其化学成分按质量分数包括:C:0.08%,Si:0.2%,Mn:1.5%,P:0.003%,S:0.003%,Al:0.02%,Ti:0.02%,Cr:0.1%,B:0.0025%,Mg+Zr:0.06%,O:0.005%,N:0.005%,Ni:0.1%,Cu:0.1%,余量为Fe和残余元素;钢中尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量为29500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量为1600个/mm2,按颗粒数量计,20%的所述尺寸在0.2~2μm的镁/锆氧化物上同时附有钛/硼氮化物。
上述钢材制备方法包括以下工艺步骤:将钒、钛、镁、钙的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;合金包芯线的芯料重量为350g/m,外径为14mm,钢带厚度0.6mm;合金包芯线的芯料化学成分按质量分数包括:Ti:35%、Mg+Zr:20%、B:5%、N:8%、O:6%、Fe:5%、Si:10%、Mn:7%和残余元素;将所述合金包芯线安装至精炼站的喂线机上;
将铁水和废钢利用电炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;钢包运送至精炼站进行RH精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;在钢水的溶解氧达到0.0008wt%、溶解氮达到为0.0035wt%后,喂入所述合金包芯线,喂入速度为180m/min,进行底吹氩气10min;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;钢水进行全保护浇铸,得到铸坯;
铸坯冷装入加热炉加热,铸坯加热温度1200℃,加热时间150min;加热后的铸坯送入轧机轧制;轧机初轧温度1150℃,终轧温度1100℃;轧制后的钢材进行冷却至室温;钢板进行离线调质热处理,淬火温度900℃,加热时间30min;回火温度580℃,回火时间60min;得到兼具低温焊接和高热输入焊接性能的高强度钢板。
所述钢板在不预热、焊接热输入为45kJ/cm的条件下,焊接热影响区-40℃冲击韧性为240J;在不预热、焊接热输入为250kJ/cm的条件下,焊接热影响区-40℃冲击韧性200J。在钢材250kJ/cm焊接热影响区中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a=16000个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b=1800个/mm2;a和b满足关系式5<a/b<50和104<2a+10b<105。
对比例1
本对比例中,一种高强度钢板,其化学成分按质量分数包括:C:0.04%,Si:0.25%,Mn:1.85%,P:0.002%,S:0.002%,Al:0.025%,Ti:0.02%,Mg+Zr:0.005%,O:0.004%,N:0.004%,Cr:0.1%,Mo:0.1%,Ni:0.2%,余量为Fe和残余元素;钢材基材中尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量为a=63500个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量为b=500个/mm2,a和b不满足关系式10<a/b<100和104<a+10b<105。
上述钢材制备方法包括以下工艺步骤:将铁水利用转炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;钢包运送至精炼站进行LF精炼,调整钢水成分和温度;精炼过程采用的气体为氩气;单独添加各种元素的合金,调整钢水成分达到所述钢板成分要求,出站;钢水进行全保护浇铸,得到铸坯;
铸坯热装加热炉加热;铸坯加热温度1150℃,加热时间60min;加热后的铸坯送入轧机轧制;轧机初轧温度1100℃,终轧温度780℃;轧制后的钢材冷却至室温;得到所述高强度钢板。
所述钢板在预热温度为80℃、焊接热输入为15kJ/cm的条件下,焊接热影响区-40℃冲击韧性为35J。以及不预热、焊接热输入为100kJ/cm的条件下,焊接热影响区-40℃冲击韧性为18J。在钢材100kJ/cm焊接热影响区中,尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a=55000个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b=400个/mm2;a和b不满足关系式5<a/b<50和104<2a+10b<105。
该对比例没有对氮化物和氧化物的分布进行优化控制,焊接性能难以满足需要。
Claims (10)
1.一种兼具低温焊接和高热输入焊接性能的高强度钢,其特征在于,所述钢材的化学成分按质量分数包括:C:0.03~0.16%,Si:0.05~0.5%,Mn:1.0~1.9%,P:0.002~0.02%,S:0.001~0.01%,Al:0.005~0.07%,Ti:0.005~0.04%,Cr:0.1~0.5%,B:0.0005~0.005%,Mg+Zr:0.002~0.01%,O:0.001~0.008%,N:0.004~0.01%,余量为Fe和残余元素;
所述钢材中含有氮化钛或氮化硼的化合物记为钛/硼氮化物,含有氧化镁或氧化锆的化合物记为镁/锆氧化物;钢中尺寸在0.02~0.2μm的所述的钛/硼氮化物的数量记为a个/mm2,尺寸在0.2~2μm的所述的镁/锆氧化物的数量记为b个/mm2;在钢材基材中,a和b满足关系式10<a/b<100和104<a+10b<105;在钢材焊接热影响区中,a和b满足关系式5<a/b<50和104<2a+10b<105。
2.如权利要求1所述的一种兼具低温焊接和高热输入焊接性能的高强度钢,其特征在于,所述钢材的化学成分按质量分数还包括:Mo:0.1~0.5%,Ni:0.1~0.5%,Cu:0.1~0.5%,Nb:0.01~0.06%,V:0.01~0.06%中的一种或几种。
3.如权利要求1所述的一种兼具低温焊接和高热输入焊接性能的高强度钢,其特征在于,所述的钢材基材中,按颗粒数量计,3~30%的所述尺寸在0.2~2μm的镁/锆氧化物上同时附有钛/硼氮化物。
4.如权利要求1~3任意一项所述的一种兼具低温焊接和高热输入焊接性能的高强度钢,其特征在于,所述钢材在预热温度低于100℃、焊接热输入为5~50kJ/cm的条件下,以及预热温度低于50℃、焊接热输入为50~500kJ/cm的条件下,焊接热影响区-40℃冲击韧性≥47J。
5.权利要求1或2所述的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,其特征在于,包括以下工艺步骤:
步骤1、制线:
将钛、硼、镁、锆的合金进行增氮增氧处理,得到氮氧合金,将所述氮氧合金破碎成粒径<3mm的粉末,利用钢带包裹,制成合金包芯线;
所述合金包芯线的芯料重量为200~500g/m,外径为9~16mm,钢带厚度0.3~0.6mm;
所述合金包芯线的芯料化学成分按质量分数包括:Ti:20~45%、Mg+Zr:5~30%、B:1~10%、N:1~15%、O:1~10%、Fe:1~50%、Si:1~50%、Mn:1~50%和残余元素;
将所述合金包芯线安装至精炼站的喂线机上;
步骤2、炼钢:
将铁水和/或废钢利用转炉或电炉熔炼成钢水,并出钢至钢包,熔炼和出钢过程底吹氩气;
钢包运送至精炼站精炼,调整钢水成分和温度;精炼过程采用的气体为氩气,并防止钢水在空气中吸氮;
在钢水的溶解氧达到<0.001wt%、溶解氮达到<0.004wt%后,喂入所述合金包芯线;调整钢水合金成分满足兼具低温焊接和高热输入焊接性能的高强度钢化学成分要求,出站;
钢水进行全保护浇铸,得到铸坯;
步骤3、轧制:
铸坯直接送入轧机轧制,或者铸坯热装或冷装入加热炉加热;铸坯加热温度1150~1300℃,加热时间30~300min;
加热后的铸坯送入轧机轧制;轧机初轧温度1100~1250℃,终轧温度750~1100℃;轧制后的钢材冷却至室温;
得到兼具低温焊接和高热输入焊接性能的高强度钢。
6.如权利要求5所述的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,其特征在于,所述的步骤1中,将钛、硼的合金进行增氮处理,将镁、锆的合金进行增氧处理,两者混合后制成包芯线,或者分别制成包芯线,应用于所述步骤2中。
7.如权利要求5所述的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,其特征在于,所述的步骤2中,钢水的精炼方法为LF、RH、VD中的一种或几种。
8.如权利要求5所述的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,其特征在于,所述的步骤2中,合金包芯线的喂入速度为100~200m/min。
9.如权利要求5所述的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,其特征在于,所述的步骤2中,在喂入合金包芯线之后,钢水进行底吹氩气≥3min。
10.如权利要求5所述的一种兼具低温焊接和高热输入焊接性能的高强度钢的生产方法,其特征在于,所述的步骤3中,轧制后的钢材进行在线控制冷却或离线热处理。
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CN109321816A (zh) * | 2017-07-31 | 2019-02-12 | 东北大学 | 一种适于大线能量焊接的屈服强度460MPa级钢板及其制造方法 |
CN109321846B (zh) * | 2017-07-31 | 2020-08-28 | 东北大学 | 一种屈服强度355MPa级大线能量焊接用钢板及其制备方法 |
CN116752044A (zh) * | 2019-06-27 | 2023-09-15 | 日本制铁株式会社 | 钢材及其制造方法 |
CN113025915B (zh) * | 2021-03-04 | 2022-02-01 | 东北大学 | 一种高强韧性钒氮微合金化热轧钢管及其制造方法 |
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