CN115216702A - 一种冷冲压用高强油箱托架用钢及其制造方法 - Google Patents
一种冷冲压用高强油箱托架用钢及其制造方法 Download PDFInfo
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B21B45/0203—Cooling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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Abstract
本发明公开了一种冷冲压用高强油箱托架用钢及其制造方法。所述油箱托架用钢化学成分按质量百分比配比为:C:0.04~0.07%,Mn:1.45~1.55%,Si:≤0.2%,S:≤0.005%,P≤0.015%,Nb:0.035~0.045%,Cr:0.3~0.5%,Ti:0.06~0.075%,Alt:0.02~0.06%,N≤0.0060%,其余为Fe和不可避免的杂质元素。生产方法包括:铁水预脱硫,转炉冶炼,LF精炼,板坯连铸,加热,轧制,层流冷却,卷曲,缓冷厢缓冷;通过严格控制层流两端冷却模式的温度和冷却速率,并采用轧后缓冷的工艺,最终得到屈服强度≥600MPa,抗拉强度≥700MPa,延伸率≥22%的冷冲压用高强油箱托架用钢,该油箱托架用钢强度高,塑形好,可广泛应用于商用车油箱领域,填补了国内冷冲压用高强油箱托架用钢的空白。
Description
技术领域
本发明属于钢铁材料技术领域,尤其涉及一种冷冲压用高强油箱托架用钢及其制造方法,该方法适合生产冷冲压成型用高强油箱托架的钢材,主要应用在商用车油箱领域。
背景技术
油箱托架是油箱的主要支撑件,制作工艺复杂,变形量大,对材料的塑性要求较高,长期以来一直使用低强度级别的普通钢材进行冲压加工。随着商用车轻量化的发展,逐步用薄规格的高强钢代替厚规格的低强度级别的普通钢材进行冲压制作油箱托架,从而减轻油箱托架的重量,以实现商业汽车的轻量化。
目前国内冷冲压用高强油箱托架用钢属于空白,没有专用的钢种和标准,托架加工厂家只有使用一些替代材料,如700L,700BL、QStE650TM等,这些都属于大梁用钢,700L现行国家标准GB/T3273-2015要求断后伸长率≥14%,对塑性要求较低,导致大梁钢高强度低塑性不能满足油箱托架复杂的变形要求,造成在托架冲压过程中,开裂率较高。因此,油箱托架加工厂家急需要求研发冷冲压用高强油箱托架用钢材料,以满足轻量化油箱托架在冲压过程对复杂变形的要求。
冷冲压用高强油箱托架用钢主要采用2.0~6.0mm厚度的热轧钢板进行冷冲压成型,众所周知,随着材料强度的提高,其塑性会随着下降,导致在冲压过程中由于塑性不足引起开裂,因此冷冲压用高强油箱托架用钢不仅具有高强度而且还要具有高塑性。冷冲压用高强油箱托架用钢的具体性能要求为:抗拉强度≥700MPa,屈服强度≥600MPa,延伸率≥22%。
发明内容
本发明的目的在于提供一个冷冲压用高强油箱托架用钢的钢种,该钢种可以应用在商用车油箱领域,使商用车油箱托架实现轻量化。
本发明的另一目的在于提供一种冷冲压用高强油箱托架用钢的制造方法,通过该制造方法,最终得到均匀的多边形铁素体和珠光体混合物,达到抗拉强度≥700MPa,屈服强度≥600MPa,延伸率≥22%的性能指标。
为实现上述目的,本发明采用的技术方案为:
一种冷冲压用高强油箱托架用钢,按以下质量百分比配比:C:0.04~0.07%,Mn:1.45~1.55%,Si:≤0.2%,S:≤0.005%,P≤0.015%,Nb:0.035~0.045%,Cr:0.3~0.5%,Ti:0.06~0.075%,Alt:0.02~0.06%,N≤0.0060%,其余为Fe和不可避免的杂质元素。
其中,C:碳在钢中起到间隙固溶强化,提高强化效果和珠光体含量,提高强度和硬度。增加碳含量虽然能显著提高钢的强度,但对钢的塑性不利。综合考虑,本发明的冷冲压用高强油箱托架用钢的碳含量控制在0.04~0.07%。
Mn:锰元素在钢中主要起到固溶强化,还可以细化晶粒,提高强度,增加韧性;但是Mn含量不能过高,过高对铸坯中心偏析和钢板带状组织不利,容易造成冲压开裂。综合考虑,本发明的冷冲压用高强油箱托架用钢的锰含量控制在1.45~1.55%。
铌钛合金化:Nb、Ti是比较常用的微合金强化元素,Nb、Ti可以通过碳、氮化物的弥散析出及固溶作用,细化晶粒,提高强度和韧性,提高奥氏体再结晶温度,改善钢的焊接性能。但是Ti相对于Nb来说,化学性质较活泼,冶炼过程中易与氧、硫、氮、碳等元素形成化合物,不易控制,容易造成强度波动较大,性能稳定性差。此外,轧制工艺应要考虑Nb和Ti碳化物的固溶和析出方式,采用合适的轧制工艺。综合考虑,本发明的冷冲压用高强油箱托架用钢的Nb控制在0.035~0.045%,Ti控制在0.06~0.075%。
Cr:铬元素能增加钢的淬透性,而且加入Cr后钢材的力学性能也会大幅提升。综合考虑,本发明的冷冲压用高强油箱托架用钢的Cr控制在0.3~0.5%。
进一步,所述冷冲压用高强油箱托架用钢的厚度为2.0~6.0mm,抗拉强度≥700MPa,屈服强度≥600MPa,延伸率≥22%。
一种冷冲压用高强油箱托架用钢的制造方法,包括以下工序:铁水预脱硫,转炉冶炼,LF精炼,板坯连铸,轧制,层流冷却,卷曲,缓冷厢缓冷;其中,
所述铁水预脱硫采用石灰和镁粉脱硫,使[S]≤0.003%,铁水脱硫扒渣干净,保证扒渣亮面≥95%;
所述转炉冶炼采用洁净废钢和优质冶金石灰进行冶炼,终点[C]≤0.05%,[P]≤0.015%,[S]≤0.020%,终点温度1630-1670℃,出钢过程中严禁下渣;
所述LF精炼全程控铝控氮,白渣保持时间不小于15min,软搅拌时间不低于8min,上钢成分严格控制在C:0.04~0.07%,Mn:1.45~1.55%,Si:≤0.2%,S:≤0.005%,P≤0.015%,Nb:0.035~0.045%,Cr:0.3~0.5%,Ti:0.06~0.075%,Alt:0.02~0.06%,N≤0.0060%,上钢温度控制在1565-1580℃;
所述连铸过程全程采用保护浇注,结晶器液面波动±3mm,钢水过热度控制在10~20℃,拉速稳定在0.8m/min~1.2m/min。
进一步,所述轧制过程如下:
将厚230mm的铸坯装入加热炉加热到1190℃~1230℃,并保温140~180分钟,加热温度的选择一方面保证Nb、Ti、Cr的充分固溶,另一方面防止钢坯过热、过烧;
粗轧,经过5道次粗轧后,终轧温度≤1050℃,中间坯厚度在34mm~40mm;需要说明的是,粗轧过程主要是使高温奥氏体重新再结晶,细化奥氏体晶粒,一定要保证道次压下量≥15%;
精轧,为提高表面质量,降精轧氧化铁皮厚度,精轧穿带速度为410-630m/min,精轧机入口温度≤980℃,出口温度≤880℃,精轧温度的选择是保证在再结晶温度以下进行轧制,保证钢材晶粒细小均匀,防止混晶。
进一步,所述层流冷却采用两端冷却模式进行,开始采用前端集中冷却到720℃~740℃,冷却速率为10-23℃/S,然后空冷3~4秒,后端采用集中冷却,冷却速率为11-16℃/S,最终卷曲温度为620℃~640℃。层流冷却采用的是两端水冷和中间空冷的冷却模式,温度的确定是保证前端的水冷阶段,材料处于奥氏体转变为铁素体之前;后端的水冷阶段保证在材料处于奥氏体转变为铁素体的相变之后,保证相变过程处于空冷阶段。
进一步,所述卷曲后采用缓冷厢中缓冷,将卷曲后的钢卷立即放入缓冷厢中大于48h。通过保温一是可以释放钢材自身内应力,减少位错强化;二是使均匀卷曲后冷却速率,增加通卷性能稳定性。
与现有技术相比,本发明的有益效果为:
1、本发明通过对钢材中合金元素的优化,通过采用低碳,中锰,少量铬,铌钛微合金化的窄成分控制体系,不仅保证了钢材的高强度和高塑性,而且还保证了钢材的性能均匀性。
2、本发明通过采用纯净钢冶炼技术,从铁水预处理,转炉冶炼,LF炉精炼到连铸整个冶炼工序,保证了钢水的纯净度,从而减少了钢材在冲压过程中的开裂倾向。
3、本发明通过采用严格控制两端冷却的温度,前端冷却通过增加过冷度提高相变驱动力促进铁素体形核,空冷是促使铁素体大量析出、增加铁素体含量,后端冷却是抑制铁素体长大并促进高碳浓度奥氏体向珠光体转变,获得弥散分布的高强度珠光体组织。通过两端冷却可以提高材料的均匀延伸率,进而减少了钢材在冲压过程中的开裂率。
4、通过采取卷曲后缓冷的工艺,释放了钢材自身的内应力,减少位错强化,提高了材料的塑性。
附图说明
图1为本发明生产过程中冷冲压用高强油箱托架用钢的金相结构图。
具体实施方式
下面结合附图和具体的实施例对本发明的技术方案及效果做进一步描述,但本发明的保护范围并不限于此。
以下用热连轧生产线生产不同规格的冷冲压用高强油箱托架用钢,对本发明做进一步的说明。
本实施例1、实施例2和实施例3的冷冲压用高强油箱托架用钢按重量百分比配比,其中,组成成分如表1,其余为Fe和不可避免的杂质元素。
表1实施例1-3的成分组成(wt%)
成分 | C | Si | Mn | P | S | Alt | Nb | Ti | Cr | N |
实施例1 | 0.05 | 0.12 | 1.49 | 0.012 | 0.003 | 0.032 | 0.037 | 0.065 | 0.35 | 0.0051 |
实施例2 | 0.06 | 0.10 | 1.52 | 0.010 | 0.001 | 0.041 | 0.039 | 0.070 | 0.37 | 0.0060 |
实施例3 | 0.04 | 0.13 | 1.53 | 0.008 | 0.001 | 0.029 | 0.041 | 0.068 | 0.34 | 0.0048 |
本实施例的冷冲压用高强油箱托架用钢生产工艺包括铁水预处理,顶底复吹转炉,LF精炼,双流板坯连铸,步进式加热炉,粗轧机,精轧机,层流冷却,卷曲后缓冷。
所述铁水预脱硫采用石灰和镁粉脱硫,使[S]≤0.003%,铁水脱硫扒渣干净,保证扒渣亮面≥95%;
所述转炉冶炼采用洁净废钢和优质冶金石灰进行冶炼,终点[C]≤0.05%,[P]≤0.015%,[S]≤0.020%,终点温度1630-1670℃,出钢过程中严禁下渣;
所述LF精炼全程控铝控氮,白渣保持时间不小于15min,软搅拌时间不低于8min,上钢温度控制在1565-1580℃;
所述连铸过程全程采用保护浇注,结晶器液面波动±3mm,钢水过热度控制在10~20℃,拉速稳定在0.8m/min~1.2m/min。
本发明冶炼采用纯净钢冶炼技术,从铁水预处理,转炉冶炼,LF炉精炼到连铸整个冶炼工序,保证了钢水的纯净度,从而减少了钢材在冲压过程中的开裂倾向。
其中,轧制工艺制度见表2。
表2实施例1-3轧制工艺制度
本发明通过采用严格控制两端冷却的温度,前端冷却通过增加过冷度提高相变驱动力促进铁素体形核,空冷是促使铁素体大量析出、增加铁素体含量,后端冷却是抑制铁素体长大并促进高碳浓度奥氏体向珠光体转变,获得弥散分布的高强度珠光体组织。通过两端冷却可以提高材料的均匀延伸率,进而减少了钢材在冲压过程中的开裂率。通过采取卷曲后缓冷的工艺,释放了钢材自身的内应力,减少位错强化,提高了材料的塑性。
本发明实施例制造的钢板包括多边形铁素体、珠光体和极少量贝氏体,两种组织占比分别为:90-95%铁素体+6-8%的珠光体。
按照本实施例的步骤生产的钢板,其性能指标见表3。
表3实施例1-3的冷冲压用高强油箱托架用钢的性能
规格/mm | 成分体系 | Rel/MPa | Rm/MPa | A/% | 180°冷弯试验d/弯心直径a/试样厚度 |
3.80 | 实施例1 | 649 | 738 | 26 | d=a合格 |
4.20 | 实施例2 | 642 | 743 | 26.5 | d=a合格 |
2.50 | 实施例3 | 665 | 759 | 25 | d=a合格 |
由表3可知,本实施例生产出来的3.80mm,4.20mm和2.50mm规格的冷冲压用高强油箱托架用钢在满足高强度的同时,可满足等比例标距下的延伸率≥22%。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (6)
1.一种冷冲压用高强油箱托架用钢,其特征在于,按以下质量百分比配比:C:0.04~0.07%,Mn:1.45~1.55%,Si:≤0.2%,S:≤0.005%,P≤0.015%,Nb:0.035~0.045%,Cr:0.3~0.5%,Ti:0.06~0.075%,Alt:0.02~0.06%,N≤0.0060%,其余为Fe和不可避免的杂质元素。
2.如权利要求1所述的冷冲压用高强油箱托架用钢,其特征在于,所述冷冲压用高强油箱托架用钢的厚度为2.0~6.0mm,抗拉强度≥700MPa,屈服强度≥600MPa,延伸率≥22%。
3.一种冷冲压用高强油箱托架用钢的制造方法,包括以下工序:铁水预脱硫,转炉冶炼,LF精炼,板坯连铸,加热,轧制,层流冷却,卷曲,缓冷厢缓冷;其中,
所述铁水预脱硫采用石灰和镁粉脱硫,使[S]≤0.003%,铁水脱硫扒渣干净,保证扒渣亮面≥95%;
所述转炉冶炼采用洁净废钢和优质冶金石灰进行冶炼,终点[C]≤0.05%,[P]≤0.015%,[S]≤0.020%,终点温度1630-1670℃,出钢过程中严禁下渣;
所述LF精炼全程控铝控氮,白渣保持时间不小于15min,软搅拌时间不低于8min,上钢成分严格控制在C:0.04~0.07%,Mn:1.45~1.55%,Si:≤0.2%,S:≤0.005%,P≤0.015%,Nb:0.035~0.045%,Cr:0.3~0.5%,Ti:0.06~0.075%,Alt:0.02~0.06%,N≤0.0060%,上钢温度控制在1565-1580℃;
所述连铸过程全程采用保护浇注,结晶器液面波动≤±3mm,钢水过热度控制在10~20℃,拉速稳定在0.8m/min~1.2m/min。
4.如权利要求3所述的冷冲压用高强油箱托架用钢的制造方法,其特征在于,所述轧制过程如下:
将厚230mm的铸坯装入加热炉加热到1190℃~1230℃,并保温140~180分钟,加热温度的选择一方面保证Nb、Ti、Cr的充分固溶,另一方面防止钢坯过热、过烧;
粗轧,经过5道次粗轧后,终轧温度≤1050℃,中间坯厚度在34mm~40mm;需要说明的是,粗轧过程主要是使高温奥氏体重新再结晶,细化奥氏体晶粒,一定要保证道次压下量≥15%;
精轧,为提高表面质量,降低精轧氧化铁皮厚度,精轧穿带速度为410-630m/min,精轧机入口温度≤980℃,出口温度≤880℃,精轧温度的选择是保证在再结晶温度以下进行轧制,保证钢材晶粒细小均匀,防止混晶。
5.如权利要求3所述的冷冲压用高强油箱托架用钢的制造方法,所述层流冷却采用两端冷却模式进行,开始采用前端集中冷却到720℃~740℃,冷却速率为10-23℃/S,然后空冷3~4秒,后端采用集中冷却,冷却速率为11-16℃/S,最终卷曲温度为620℃~640℃。层流冷却采用的是两端水冷和中间空冷的冷却模式,温度的确定是保证前端的水冷阶段,材料处于奥氏体转变为铁素体之前;后端的水冷阶段保证在材料处于奥氏体转变为铁素体的相变之后,保证相变过程处于空冷阶段。
6.如权利要求3所述的冷冲压用高强油箱托架用钢的制造方法,所述卷曲后采用缓冷厢中缓冷,将卷曲后的钢卷立即放入缓冷厢中,缓冷时间大于48h。通过保温一是可以释放钢材自身内应力,减少位错强化;二是使均匀卷曲后冷却速率,增加通卷性能稳定性。
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