CN116065095A - 一种500~800Mpa级的一钢多级冷轧低合金高强钢带及其生产方法 - Google Patents
一种500~800Mpa级的一钢多级冷轧低合金高强钢带及其生产方法 Download PDFInfo
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Abstract
本发明公开了一种500~800Mpa级的一钢多级冷轧低合金高强钢及其生产方法,钢带化学成分组成及质量百分含量为:C:0.07~0.09%,Si:0.3~0.4%,Mn:1.25~1.35%,P:0.015~0.025%,S≤0.006%,Als:0.03~0.05%,Nb:0.025~0.035%,Ti:0.055~0.07%,N≤0.004%,其余为Fe和不可避免的杂质。生产方法包括炼钢、连铸、热连轧、酸连轧、连续退火等工序;本发明采用相同的化学成分与热轧工艺,通过调节不同的冷轧退火工艺曲线,获得500~800Mpa级不同屈服强度级别的低合金高强钢带,有利于大工业生产组织与过程质量管控,降低企业生产成本。
Description
技术领域
本发明属于冶金技术领域,具体涉及一种500~800Mpa级的一钢多级冷轧低合金高强钢带及其生产方法。
背景技术
冷轧低合金高强钢,凭借良好的强韧性与可焊性,以及低成本生产可控性,广泛应用于汽车的结构件与加强件等零件中。主要采用Nb、Ti复合成分体系设计,利用Nb元素的细晶强化作用和Ti元素的弥散析出作用,实现达到屈服强度260~800Mpa的不同强度等级,以满足不同用户的需求。
随着汽车等行业向节能、降耗、环保的轻量化方向发展,500~800Mpa级的冷轧低合金高强钢应用逐步广泛,但是不同用户订货的不同强度级别与规格差异,对于大型钢铁的生产组织造成一定困扰,尤其是冶炼混浇坯与余材造成大量浪费。因此,通过采用一种化学成分体系,联合柔性化轧制技术及热处理工艺,实现不同强度级别的冷轧低合金高强钢产品,满足汽车产业多规格、多性能特点需求,降低了制造成本,成为钢铁企业函待解决的问题。
专利号为CN106929758A公开了一种一钢多级冷轧低合金高强钢带及其生产方法,其包括板坯加热、热轧、层流冷却、酸轧、连退和平整工序;所述钢带化学成分的重量百分含量为:C 0.06~0.10%,Si 0.15~0.30%,Mn 1.10~1.30%,P≤0.020%,S≤0.015%,Als0.020~0.060%,Nb 0.045~0.060%,N≤0.0060%,其余为铁和不可避免的微量元素。该专利Nb含量偏高导致成本增加,且其屈服强度级别覆盖420~500MPa,整体强度偏低。
专利号为CN109811267A公开了一种屈服强度覆盖300~340Mpa级别的一钢多级冷轧低合金高强度钢及其制造方法,其化学成分的重量百分含量为:C 0.05~0.09%,Si0.02~0.06%,Mn 0.7~1.0%,P 0.010~0.025%,S≤0.01%,Al 0.020~0.090%,Nb0.015~0.040%,N≤0.008%,余量为Fe和不可避免的杂质。其力学性能屈服强度覆盖300~340MPa级别,整体强度偏低。
专利号为CN111321342A公开了一钢多级冷轧低合金高强钢,化学成分质量百分比为:C:0.04~0.07%,Si:0.1-0.3%,Mn:0.4-0.6%,P≤0.018%,S≤0.010%,Als:0.020~0.060%,Ti:0.010-0.020%,余量为Fe和不可避免的杂质。其力学性能屈服强度覆盖300~340MPa级别,整体强度偏低。该专利实现一种炼钢成分生产出屈服强度覆盖210~260MPa级别的多级低合金高强钢板,整体强度偏低。
专利号为CN107916363A公开了一种屈服强度550MPa级冷轧钢板及其制造方法,主要解决现有屈服强度550MPa级冷轧钢板的横向Oa折弯性能合格低、制造成本高的技术问题,其化学成分重量百分比为:C:0.04~0.12%,Si:0.15~0.30%,Mn:0.5~1.0%,P≤0.020%,S≤0.010%,Alt:0.015~0.060%,Ti:0.03~0.08%,余量为铁和不可避免夹杂。该专利仅对550MPa级冷轧钢板进行描述,未提及500~800Mpa级的一钢多级制造方法。
发明内容
本发明的目的在于提供一种500~800Mpa级的一钢多级冷轧低合金高强钢带及其生产方法。
本发明解决其技术问题所采用的技术方案是:一种500~800Mpa级的一钢多级冷轧低合金高强钢带,其化学成分组成及质量百分含量为:C:0.07~0.09%,Si:0.3~0.4%,Mn:1.25~1.35%,P:0.015~0.025%,S≤0.006%,Als:0.03~0.05%,Nb:0.025~0.035%,Ti:0.055~0.07%,N≤0.004%,其余为Fe和不可避免的杂质。
具体的是,所述钢带厚度为0.7mm-2.0mm。
具体的是,所述钢带力学性能:屈服强度500MPa级时,屈服强度为500~620MPa,抗拉强度550~700MPa,伸长率A80≥15%;屈服强度600MPa级时,屈服强度为600~720MPa,抗拉强度650~800MPa,伸长率A80≥12%;屈服强度800MPa级时,屈服强度为800~900MPa,抗拉强度850~1000MPa,伸长率A80≥10%。
一种500~800Mpa级的一钢多级冷轧低合金高强钢带生产方法,包括连铸工序、热连轧工序、酸连轧工序和连续退火工序;
1)所述连铸工序,板坯厚度为230mm;
2)热连轧工序,板坯加热段温度为1260~1280℃,精轧终轧温度为890~915℃,卷取温度为540~565℃;
3)酸连轧工序,冷轧压下率为60~70%;
4)连续退火工序,生产屈服强度500MPa级时,退火均热温度为820~835℃,缓冷温度为650~670℃,快冷温度为420~440℃,过时效温度为350~380℃,终冷温度≤140℃;生产屈服强度600MPa级时,退火均热温度为800~820℃,缓冷温度为655~675℃,快冷温度为415~435℃,过时效温度为355~385℃,终冷温度≤150℃;生产屈服强度800MPa级时,退火均热温度为760~780℃,缓冷温度为660~680℃,快冷温度为410~430℃,过时效温度为360~390℃,终冷温度≤155℃。
本发明具有以下有益效果:
1)本发明采用相同的冶炼化学成分与热轧工艺,通过调节不同的冷轧退火工艺曲线,实现不同屈服强度级别的低合金高强钢带,提高了炼钢与热轧生产效率,降低了企业生产成本,有利于工业化大生产;
2)本发明提供的500~800Mpa级的一钢多级冷轧低合金高强钢带,屈服强度为500~900MPa,抗拉强度为550~1000MPa,产品延伸率A80≥10%,可满足汽车零部件对不同强度级别的要求。
附图说明
图1为500Mpa级冷轧低合金高强钢带金相组织图。
具体实施方式
现在结合附图对本发明作进一步详细的说明。
如图1,一种500~800Mpa级的一钢多级冷轧低合金高强钢带,其化学成分组成及质量百分含量为:C:0.07~0.09%,Si:0.3~0.4%,Mn:1.25~1.35%,P:0.015~0.025%,S≤0.006%,Als:0.03~0.05%,Nb:0.025~0.035%,Ti:0.055~0.07%,N≤0.004%,其余为Fe和不可避免的杂质。
钢带厚度为0.7~2.0mm;钢带力学性能:屈服强度500MPa级时,屈服强度为500~620MPa,抗拉强度550~700MPa,伸长率A80≥15%;屈服强度600MPa级时,屈服强度为600~720MPa,抗拉强度650~800MPa,伸长率A80≥12%;屈服强度800MPa级时,屈服强度为800~900MPa,抗拉强度850~1000MPa,伸长率A80≥10%。
本发明提供了一种500~800Mpa级的一钢多级冷轧低合金高强钢带的生产方法,包括炼钢、连铸工序、热连轧工序、酸连轧工序、连续退火工序等。
连铸工序,板坯厚度为230mm。
热连轧工序,板坯加热段温度为1260~1280℃,精轧终轧温度为890~915℃,卷取温度为540~565℃。
酸连轧工序,采用五机架冷连轧,冷轧压下率为60~70%。
连续退火工序,生产屈服强度500MPa级时,退火均热温度为820~835℃,缓冷温度为650~670℃,快冷温度为420~440℃,过时效温度为350~380℃,终冷温度≤140℃;生产屈服强度600MPa级时,退火均热温度为800~820℃,缓冷温度为655~675℃,快冷温度为415~435℃,过时效温度为355~385℃,终冷温度≤150℃;生产屈服强度800MPa级时,退火均热温度为760~780℃,缓冷温度为660~680℃,快冷温度为410~430℃,过时效温度为360~390℃,终冷温度≤155℃。
实施例1
(1)化学成分
C:0.073%,Si:0.39%,Mn:1.35%,P:0.022%,S:0.003%,Als:0.033%,Nb:0.034%,Ti:0.058%,N:0.003%,其余为Fe和不可避免的杂质。
(2)热轧生产工艺
将连铸板坯装入加热炉内加热,加热段温度1263℃,精轧终轧温度为892℃,卷取温度为544℃。
(3)冷轧生产工艺
对热轧后的热轧钢带进行酸连轧与连续退火机组,得到本发明涉及的500~800Mpa级的一钢多级冷轧低合金高强钢带,冷轧主要工艺参数见表1。
表1本发明实施例1的冷轧主要工艺参数
(4)力学性能
利用上述方法得到的500~800Mpa级的一钢多级冷轧低合金高强钢带带,按照金属材料拉伸试验方法(GB/T 228.1)进行拉伸,其力学性能值见表2。
表2本发明实施例1的力学性能
实施例 | 屈服强度级别 | 屈服强度/MPa | 抗拉强度/MPa | <![CDATA[断后伸长率A<sub>80</sub>/%]]> |
1-1 | 500Mpa级 | 566 | 655 | 17.5 |
1-2 | 600Mpa级 | 671 | 750 | 12.0 |
1-3 | 800Mpa级 | 833 | 884 | 10.5 |
实施例2
(1)化学成分
C:0.088%,Si:0.32%,Mn:1.26%,P:0.017%,S:0.006%,Als:0.049%,Nb:0.027%,Ti:0.067%,N:0.004%,其余为Fe和不可避免的杂质。
(2)热轧生产工艺
将连铸板坯装入加热炉内加热,加热段温度1278℃,精轧终轧温度为911℃,卷取温度为563℃。
(3)冷轧生产工艺
对热轧后的热轧钢带进行酸连轧与连续退火机组,得到本发明涉及的500~800Mpa级的一钢多级冷轧低合金高强钢带,冷轧主要工艺参数见表3。
表3本发明实施例2的冷轧主要工艺参数
(4)力学性能
利用上述方法得到的500~800Mpa级的一钢多级冷轧低合金高强钢带带,按照金属材料拉伸试验方法(GB/T 228.1)进行拉伸,其力学性能值见表4。
表4本发明实施例2的力学性能
实施例 | 屈服强度级别 | 屈服强度/MPa | 抗拉强度/MPa | <![CDATA[断后伸长率A<sub>80</sub>/%]]> |
2-1 | 500Mpa级 | 529 | 615 | 15.5 |
2-2 | 600Mpa级 | 638 | 722 | 13.5 |
2-3 | 800Mpa级 | 811 | 869 | 12.0 |
本发明不局限于上述实施方式,任何人应得知在本发明的启示下作出的结构变化,凡是与本发明具有相同或相近的技术方案,均落入本发明的保护范围之内。
本发明未详细描述的技术、形状、构造部分均为公知技术。
Claims (4)
1.一种500~800Mpa级的一钢多级冷轧低合金高强钢带,其特征在于,其化学成分组成及质量百分含量为:C:0.07~0.09%,Si:0.3~0.4%,Mn:1.25~1.35%,P:0.015~0.025%,S≤0.006%,Als:0.03~0.05%,Nb:0.025~0.035%,Ti:0.055~0.07%,N≤0.004%,其余为Fe和不可避免的杂质。
2.根据权利要求1所述的一种500~800Mpa级的一钢多级冷轧低合金高强钢带,其特征在于,所述钢带厚度为0.7mm-2.0mm。
3.根据权利要求1所述的一种500~800Mpa级的一钢多级冷轧低合金高强钢带,其特征在于,所述钢带力学性能:屈服强度500MPa级时,屈服强度为500~620MPa,抗拉强度550~700MPa,伸长率A80≥15%;屈服强度600MPa级时,屈服强度为600~720MPa,抗拉强度650~800MPa,伸长率A80≥12%;屈服强度800MPa级时,屈服强度为800~900MPa,抗拉强度850~1000MPa,伸长率A80≥10%。
4.基于权利要求1-3任一所述的一种500~800Mpa级的一钢多级冷轧低合金高强钢带生产方法,其特征在于,包括连铸工序、热连轧工序、酸连轧工序和连续退火工序;
所述连铸工序,板坯厚度为230mm;
热连轧工序,板坯加热段温度为1260~1280℃,精轧终轧温度为890~915℃,卷取温度为540~565℃;
酸连轧工序,冷轧压下率为60~70%;
连续退火工序,生产屈服强度500MPa级时,退火均热温度为820~835℃,缓冷温度为650~670℃,快冷温度为420~440℃,过时效温度为350~380℃,终冷温度≤140℃;生产屈服强度600MPa级时,退火均热温度为800~820℃,缓冷温度为655~675℃,快冷温度为415~435℃,过时效温度为355~385℃,终冷温度≤150℃;生产屈服强度800MPa级时,退火均热温度为760~780℃,缓冷温度为660~680℃,快冷温度为410~430℃,过时效温度为360~390℃,终冷温度≤155℃。
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