CN112981247B - 一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢及制备方法 - Google Patents
一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢及制备方法 Download PDFInfo
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Abstract
一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢,其化学成分及wt%含量:C:0.13~0.25%、Si:0.60~0.95%、Mn:0.4~1.2%、P:0.04~0.08%、S:≤0.003%、Cu:0.51~0.95%,Ti:0.06~0.22%,Ca:0.0012~0.006%;制备方法:1)经转炉冶炼后连铸成坯;对铸坯进行加热;轧制;层流冷却;卷取。本发明厚度规格在1.2~3.0mm,屈服强度≥600MPa,抗拉强度≥650MPa,延伸率≥12%,HB≥200,腐蚀率≤0.8g/m2·h,满足轻量化要求。
Description
技术领域
本发明涉及低合金高强钢制造领域,具体属于扫路车用耐磨耐蚀高强钢及制备方法。
背景技术
随着节能、环保、友好型成为社会的发展趋势,城市扫路车对其载重量和自重要求越来越严格,并且对现有扫路车自重提出了量化指标,要求扫路车自重必须减重15%以上。制造扫路车的主体材料为钢材,为达到扫路车自重减轻的量化指标,必须对制造扫路车的钢材进行减薄,材料减薄的同时,要保证车辆的使用安全性和使用寿命不能降低。
目前扫路车使用的钢材是屈服强度为345MPa级的Q345,如果仍采用该钢种进行厚度减薄,虽然能减轻自重,但由于厚度减薄后,使用过程中的腐蚀、磨损厚度裕量不足,不能确保车辆更高的安全性能及更长使用周期要求。
为解决这一问题,提高钢材的强韧性,赋与钢材更好的耐磨损、耐蚀性,可以达到扫路厚度减薄而使用安全性、使用寿命不降低的目的。本发明适应扫路车专用钢的发展需求,满足车辆自身减重15%以上,同时具有安全的使用寿命,发明了一种具有高强韧性、易成型性、良好耐磨耐蚀性能的新型钢铁材料。
发明内容
本发明的目的在于解决本技术领域存在的热轧钢板厚度较厚,不能满足轻量化,高强度的要求的不足,提供一种厚度规格为1.2~3.0mm,屈服强度≥600MPa,抗拉强度≥650MPa,延伸率≥12%,HB≥200,腐蚀率≤0.8g/m2·h,满足轻量化要求的扫路车箱体用耐磨耐蚀钢及制备方法。
实现上述目的的措施:
一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢,其化学成分及重量百分含量:C:0.13~0.25%、Si:0.60~0.95%、Mn:0.4~1.2%、P:0.04~0.08%、S:≤0.003%、Cu:0.51~0.95%,Ti:0.06~0.22%,Ca:0.0012~0.006%,其余为Fe和不可避免的杂质。
优选地:所述Cu的重量百分含量在0.54~0.91%。
优选地:所述Ti的重量百分含量在0.086~0.19%。
优选地:所述Ca的重量百分含量在0.0018~0.0048%。
制备一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢的方法,其步骤:
1)经转炉冶炼后连铸成坯;期间控制铸坯拉速在3.6~5.2m/min,铸坯厚度在50~90mm;
2)对铸坯进行加热,并控制铸坯入炉温度在752~948℃,出炉温度在1100~1250℃;
3)进行轧制,并控制第1、2机架轧制压下率在50~60%,终轧温度在830~920℃;
4)进行层流冷却,在冷却速度为15~35℃/s下冷却至卷取温度;
5)进行卷取,控制卷取温度在580~700℃。
本发明各元素及主要工艺的机理及作用
C是提高钢强度最经济有效的合金元素,同时能提高钢的耐磨性能。本发明钢中的C含量为0.13~0.25%。
合金元素Si是有利于提高钢的强度和耐蚀性能,本发明钢中的Si含量设计为0.60~0.95%。
钢中添加Mn,不仅可以通过Mn的固溶强化提高钢的强度和耐磨性能,而且可降低钢的相变温度,细化晶粒,提高钢的韧性,本发明钢Mn含量设计为0.4~1.2%。
Cu是提高钢耐蚀性能最主要的合金元素,Cu、P复合添加能大幅提高钢的耐蚀性能。本发明钢中的P含量设计为0.04~0.08%;钢中的Cu能有效的提高钢的耐蚀性能,同时,Cu通过固溶强化能提高钢的强度,本发明钢中的Cu含量设计为0.51~0.95%,优选地Cu的重量百分含量在0.54~0.91%。
S是钢中的有害元素,生成的硫化物夹杂严重影响钢的力学性能,同时,本发明钢采用Ti微合金化,Ti与S易生成Ti2S夹杂,从而减少钢中有效Ti的含量,进一步影响钢的力学性能,因此应尽量降低钢中的S含量,使其含量在0.003%以下。
Ti是成本最低廉的微合金元素,为降低成本而又达到好的强化效果,本发明钢中采用高Ti微合金化设计,通过Ti的沉淀强化提高钢的强度,为达到最佳的沉淀强化效果,Ti含量与C含量必须合理匹配,同时析出的纳米级碳氮化Ti能够提高钢的耐磨性能。本发明钢中Ti含量设计为0.06~0.22%,优选地Ti的重量百分含量在0.086~0.19%。
微量Ca可以形成CaO和CaS溶解于钢表面薄电解液膜中,使腐蚀界面的碱性增大,降低其侵蚀性,促进锈层转化为致密、保护性好的α-FeOOH,显著改善钢的耐蚀性能,本发明钢中Ca含量设计为0.0012~0.0060%,优选地Ca的重量百分含量在0.0018~0.0048%。
本发明之所以控制铸坯入炉温度在752~948℃,出炉温度在1100~1250℃,是由于保证奥氏体均匀化、合金元素充分固溶。
本发明之所以控制第1、2机架轧制压下率在50~60%,终轧温度在830~920℃,是由于细化奥氏体晶粒及细化最终组织,提高钢的强韧性和耐磨性。
本发明之所以控制卷取温度在580~700℃,是由于在此温度下,TiC能充分、均匀析出,提高钢的强韧性和耐磨性。
本发明的优点是以C-Mn钢为基础,通过添加廉价的Ti,并通过固溶强化、沉淀强化、细晶强化和组织强化,提高钢的强度及耐磨性能,避免了大量添加合金元素,节省了成本;同时匹配合理的耐蚀机理,优化耐蚀合金元素的添加,以Cu+P为基础,避免大量添加其它耐蚀合金元素,保证耐蚀性能中,降低了成本;生产上采用薄板坯连铸连轧工艺生产厚度规格1.2~3.0mm超薄规格高强度热轧钢,突破了热轧高强钢带的厚度规格极限,为节能环保、轻量化提供了选择,满足了扫路车用钢的发展趋势与市场需求。
本发明与现有技术相比,厚度规格在1.2~3.0mm,屈服强度≥600MPa,抗拉强度≥650MPa,延伸率≥12%,HB≥200,腐蚀率≤0.8g/m2·h,满足轻量化要求。
附图说明
图1为用本发明钢的金相组织图。
具体实施方式
下面结合具体实施例对本发明进行进一步描述:
表1为本发明各实施例及对比例的组分取值列表;
表2为本发明各实施例及对比例的主要工艺参数取值列表;
表3为本发明各实施例及对比例的性能检测结果列表。
本发明各实施例均按照以下步骤生产:
1)经转炉冶炼后连铸成坯;期间控制铸坯拉速在3.6~5.2m/min,铸坯厚度在50~90mm;
2)对铸坯进行加热,并控制铸坯入炉温度在752~948℃,出炉温度在1100~1250℃;
3)进行轧制,并控制第1、2机架轧制压下率在50~60%,终轧温度在830~920℃;
4)进行层流冷却,在冷却速度为15~35℃/s下冷却至卷取温度;
5)进行卷取,控制卷取温度在580~700℃。
表1本发明各实施例和对比例的化学成分列表
表2本发明各实施例和对比例的主要工艺参数列表
说明:对比例层流冷却速度是常规的。
表3本发明各实施例和对比例力学性能检测结果列表
说明:腐蚀率试验条件:温度23±2℃,10%H2SO4+3.5%NaCl,全浸24h。
从表3中可以看出:本发明实施例钢的厚度规格为1.2~2.7mm,屈服强度在610~640MPa,抗拉强度在670~809MPa之间,延伸率均大于20%,HB均大于200。能整体表现出本发明钢具有超薄厚度规格,且不同厚度规格钢的力学能性及耐磨性能优良。本发明实施例钢的耐蚀性能均优于扫路车现用对比钢种。
本发明的实施例仅为最佳例举,并非对技术方案的限定性实施。
Claims (3)
1.一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢,其化学成分及重量百分含量:C:0.138~0.25%、Si: 0.74~0.95%、Mn:0.4~1.15%、P:0.04~0.08%、S:≤0.003%、Cu:0.67~0.95%,Ti:0.084~0.22%,Ca:0.004~0.006%,其余为Fe和不可避免的杂质;
所述Rm≥650MPa扫路车箱体用耐磨耐蚀钢的制备方法:
1)经转炉冶炼后连铸成坯;期间控制铸坯拉速在4.6~5.2m/min,铸坯厚度在50~90mm;
2)对铸坯进行加热,并控制铸坯入炉温度在752~847℃,出炉温度在1100~1250℃;
3)进行轧制,并控制第1、2机架轧制压下率在50~60%,终轧温度在884~920℃;
4)进行层流, 在冷却速度为15~35℃/s下冷却至卷取温度;
5)进行卷取,控制卷取温度在638~700℃。
2.如权利要求1所述的一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢,其特征在于:所述Ti的重量百分含量在0.086~0.19%。
3.制备如权利要求1所述的一种采用CSP生产的Rm≥650MPa扫路车箱体用耐磨耐蚀钢的方法,其步骤:
1)经转炉冶炼后连铸成坯;期间控制铸坯拉速在4.6~5.2m/min,铸坯厚度在50~90mm;
2)对铸坯进行加热,并控制铸坯入炉温度在752~847℃,出炉温度在1100~1250℃;
3)进行轧制,并控制第1、2机架轧制压下率在50~60%,终轧温度在884~920℃;
4)进行层流, 在冷却速度为15~35℃/s下冷却至卷取温度;
5)进行卷取,控制卷取温度在638~700℃。
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