CN115478209A - 一种拉深性能良好的热轧酸洗搪瓷钢及其生产方法 - Google Patents
一种拉深性能良好的热轧酸洗搪瓷钢及其生产方法 Download PDFInfo
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Abstract
一种拉深性能良好的热轧酸洗搪瓷钢及其生产方法,其化学成分重量百分比为:C:0.001~0.006%,N≤0.004%,S≤0.0080%,Als:0.015~0.040%,采用Mn强化时,Mn:1.0~1.5%,Si:0.001~0.03%,P≤0.015%;采用Si强化时,Si:0.4~0.6%,Mn:0.15~0.3%,P≤0.015%;采用P强化时,Si:0.001~0.03%,Mn:0.15~0.3%,P:0.035~0.055%;还包括Ti,且4[C]+3.42[N]+3[S]≤[Ti]≤0.065%,其余为Fe及其它不可避免的杂质。本发明通过超低碳、Ti微合金成分设计,结合低温大压下润滑轧制、缓慢冷却、高温卷取,实现铁素体中无固溶C、N间隙原子,产品屈服强度为210~245MPa,抗拉强度为≥320MPa,延伸率≥46%,r值≥1.3,n值≥0.3,TH值≥7.0,产品具有良好的成形性能,特别是具有良好的拉深性能,还具有较高的抗拉强度和抗鳞爆性能。
Description
技术领域
本发明属于搪瓷钢生产技术领域,具体涉及一种拉深性能良好的热轧酸洗搪瓷钢及其生产方法。
背景技术
搪瓷是将无机玻璃质材料通过熔融凝于基体金属上并与金属牢固结合在一起的一种复合材料。搪瓷制品既拥有金属材料所固有的强度、韧性和可加工性,又具有陶瓷材料的耐腐蚀、耐老化、耐磨、耐高温、无毒和可装饰的特性,兼备了金属材料和陶瓷材料的优点。以钢板为金属基板的搪瓷制品在国民经济中发挥着十分重要的作用,广泛地应用于轻工、家电、冶金、化工、建筑等行业。
搪瓷钢板的种类很多,按生产工艺分有热轧酸洗板、冷轧板和覆层板等,其中,热轧板由于良好的经济性得到了越来越广泛的应用,例如用于制备热水器内胆,其厚度一般为1.5~2.5mm,年需求量超过50万吨。
目前,热水器内胆普遍采用卷圆、焊接方式生产,生产效率、成材率较低。为提高生产效率、成材率,热水器行业逐渐开始采用拉深工艺生产热水器内胆,需要提高搪瓷钢产品的拉伸性能。
在工艺条件相对稳定的情况下,热轧搪瓷钢的拉深性能主要与以下几个性能指标相关:
(1)塑性应变比r值:高的塑性应变比r值对拉深成形有利。
(2)硬化指数n值:板材n值大说明材料在塑性变形分布均匀性好,不容易产生集中变形,也就相对地不容易产生塑性破裂。
(3)屈强比:一般屈强比越低,对于压缩机壳体拉深有利。
(4)延伸率:高的延伸率对零件的单向拉深变形有利,一般来讲,高的延伸率是满足零件顺利成形的重要保证。
中国专利CN201310547968.1公开了“屈服强度为245MPa级的热轧薄板搪瓷钢及制造方法”,制备的搪瓷钢厚度为1.0~2.5mm,化学成分为C:0.001-0.010%,Si≤0.05%,Mn:0.10-0.50%,P≤0.020%,S≤0.010%,Ti:0.04-0.10%,Als:0.02-0.08%,N≤0.008%,其制造工艺为,加热温度为1230~1270℃,开轧温度为1100~1150℃,终轧温度为860~930℃,卷取温度为600~700℃。产品屈服强度245~330MPa,抗拉强度≥300MPa,延伸率为37~42%。
中国专利CN2013105483 10.2公开了“屈服强度为330MPa级的热轧薄板搪瓷钢及制造方法”,制备的搪瓷钢厚度为1.0~2.5mm,化学成分按重量百分比计为C:0.02-0.07%,Si≤0.05%,Mn:0.10-0.50%,P≤0.020%,S≤0.010%,Ti:0.04-0.10%,Als:0.02-0.08%,N≤0.008%,其余为Fe及不可避免的夹杂,且Ti/C=1.0~1.5。其制造工艺为:加热温度为1200~1250℃,终轧温度为860~930℃,卷取温度为650~700℃。产品屈服强度为330~450MPa,抗拉强度≥400MPa,延伸率为38~41%。
中国专利CN201510280022.2公开了“一种具有优良抗鳞爆性能的搪瓷钢及其钢板的制造方法”,其钢中化学成分按重量百分比为:C:0.04-0.10%、Si≤0.10%、Mn:0.30-1.0%、Ti:0.03-0.10%、P≤0.015%、S:0.010-0.045%、N:0.003-0.009%、Als:0.005-0.050%、Cr:0.05-0.25%,且Ti/C:0.5~1.2。连铸坯加热温度为1180~1250℃,精轧开轧温度980~1100℃,终轧温度为880~950℃,轧后采取前段冷却方式,在6s时间内以≥30℃/s冷速快冷至630~700℃卷取,产品屈服强度为390~500MPa,抗拉强度为476~598MPa,延伸率为26~38%。
中国专利201510398485.9专利“地铁装饰用薄板搪瓷钢及其制造方法”,搪瓷钢的厚度为1.0~2.0mm,其化学成分重量百分比如下:C:0.001-0.003%、Si≤0.10%、Mn:0.05-0.10%、P≤0.010%、S≤0.005%、Als:0.01-0.02%、Ti:0.20-0.25%、N:0.010-0.020%。出炉温度为1100~1150℃,终轧温度为800~850℃,卷取温度为700~750℃。产品屈服强度≥460MPa,抗拉强度≥550Pa,延伸率为38~42%,r值为1~1.5,n值为0.1~0.3。
中国专利201810663362.7公开了“一种CSP工艺生产的低成本高氧搪瓷钢及其制造方法”,其化学成分重量百分为:C≤0.01%、Mn:0.10-1.00%、O≤0.0500%、Si≤0.01%、P≤0.020%、S≤0.030%、Als≤0.01%,其余为Fe及不可避免的杂质。该专利通过提高钢中的氧含量,形成数量较多的氧化物夹杂,作为储氢的陷阱,提高钢板的抗鳞爆性能。其制造工艺为,出炉温度为1160~1200℃,终轧温度为860~900℃,卷取温度为600~640℃,屈服强度为151~214MPa,抗拉强度为256~282MPa,延伸率为35.2~45.4%。
中国专利CN201910697103.0公开了“一种260MPa级别热轧酸洗搪瓷钢及其生产方法”,其化学成分重量百分为:C:0.030-0.060%、Si≤0.030%、Mn:0.30-0.60%、P≤0.020%、S≤0.010%、Als≤0.060%、B:0.0015-0.0040%、N:0.0040-0.0100%。其制造方法为:轧制前钢板加热温度控制在1132~1212℃,终轧温度控制在881~890℃,卷取温度控制在687~696℃,酸洗液中游离酸浓度105~119g/L,酸液温度71.4~74℃。产品屈服强度≥260MPa、抗拉强度≥360MPa、延伸率为33~34%。
中国专利CN202010986947.X公开了“深冲用热轧搪瓷钢及其制造方法”,其成分质量百分比为:C<0.01%,Si≤0.05%,Mn 0.10-0.80%,P≤0.030%,S≤0.015%,Ti 0.01-0.08%,Al 0.01-0.07%,N≤0.010%,4≤Ti/N≤10,Ca 0.0010-0.0040%,Ca/S≤1.25。其制造方法为:加热温度为1150~1190℃,终轧温度为800~900℃,卷取温度为710~760℃,热轧粗轧累计变形率控制在70%以上,精轧累计变形率控制在70%以上。平整压力700~900吨,所述平整的平整延伸率为7~12%。产品的屈服强度为359~402MPa,抗拉强度为447~483MPa,延伸率为30~41%。
中国专利CN202010986956.9公开了“一种搪瓷钢及其制备方法和应用”,其成分质量百分比为:C:0.01-0.14%,Si≤0.10%,Mn:0.20-1.6%,P≤0.040%,S≤0.040%,Ti:0.01-0.12%,Al:0.01-0.07%,N≤0.010%,Mn/S≥30。其制备方法为:加热温度为1200~1350℃,终轧温度为810~980℃,卷取温度为500~700℃,热轧的粗轧累计变形率控制在70%以上,热轧的精轧累计变形率控制在70%以上,平整的压力为450~650吨,平整延伸率≤6%,采用抛丸酸洗过程中,抛丸机的转速为1650~1850rpm,抛丸的粒径为0.18~0.85mm,抛丸的硬度为40~52HRC;酸洗液的浓度为5~20%。产品屈服强度≥410,抗拉强度为490MPa,延伸率为25~43.5%。
综上所述,现有公开的搪瓷钢屈服强度较高,延伸率较低,拉深性能较差,拉深成形过程中易出现拉毛、开裂等质量问题,因此,开发拉深性能良好的热轧搪瓷钢对推动热水器内胆制造行业的升级、家电行业的绿色转型具有重要意义。
发明内容
本发明的目的在于提供一种拉深性能良好的热轧酸洗搪瓷钢及其生产方法,该热轧酸洗搪瓷钢的屈服强度为210~245MPa,抗拉强度≥320MPa,延伸率≥46%,n值≥0.3,r值≥1.3,TH值≥7.0,产品具有良好的成形性,特别是具有良好的拉深成形性能,还具有较高的强度和抗鳞爆性能,满足热水器内胆的生产要求。
为了达到上述目的,本发明提供的技术方案是:
一种拉深性能良好的热轧酸洗搪瓷钢,其化学成分重量百分比为:C:0.001~0.006%,N≤0.004%,S≤0.0080%,Als:0.015~0.040%,采用Mn强化时,Mn:1.0~1.5%,Si:0.001~0.03%,P≤0.015%;采用Si强化时,Si:0.4~0.6%,Mn:0.15~0.3%,P≤0.015%;采用P强化时,Si:0.001~0.03%,Mn:0.15~0.3%,P:0.035~0.055%;还包括Ti,且4[C]+3.42[N]+3[S]≤[Ti]≤0.065%,其余为Fe及其它不可避免的杂质。
本发明所述热轧酸洗搪瓷钢的显微组织为均匀具有{111}面织构的多边形铁素体晶粒,且晶粒度不超过7级。
本发明所述热轧酸洗搪瓷钢的屈服强度为210~245MPa,抗拉强度为≥320MPa,延伸率≥46%,r值≥1.3,n值≥0.3,TH值≥7.0。
在本发明所述热轧酸洗搪瓷钢的成分设计中:
C:固溶C会使钢的屈服强度和抗拉强度提高,但塑性会下降,同时固溶C不利于{111}织构的形成,降低产品的r值。极限拉深比较高的材料,要求屈服强度低、伸长率高、{111}织构强度高,因此,固溶C越小越好,但C含量越低,降低C含量所需的精炼成本越高,精炼时间也越长。为平衡力学性能和生产成本,本发明钢中C含量控制为0.001~0.006%。
N:是强烈的固溶强化元素,不利于{111}织构的形成,且会产生时效影响钢板的冲压质量,但N含量过低会增加生产成本,综合考虑,本发明钢中N含量控制在0.004%以下。
S:是钢中有害的杂质元素,钢中S易在钢中形成偏析,降低钢的韧性和焊接性能,S易形成塑性硫化物,使钢板产生分层,恶化钢板性能,故S含量越低越好,综合考虑,本发明钢中S含量控制在0.008%以下。
Als:Al是强脱氧剂,减少钢中的氧化物夹杂,使钢质纯净,但Al含量过高易产生细化晶粒作用,使屈服强度、屈强比提高,综合考虑,本发明钢中Als控制为0.015-0.040%。
Ti:Ti与钢中的C、N有极强的亲和力,通过生成TiC和TiN固定C、N间隙原子,减少钢中固溶的C、N含量,有利于促进{111}织构的形成、提高r值,另外,由于Ti与S结合能力大于Ti与C的结合能力,为确保Ti能去除固溶的C原子,根据生成TiC、TiN和Ti4C2S2的质量百分比,应确保0.065%≥[Ti]≥4[C]+3.42[N]+3[S]。形成的TiC、TiN和Ti4C2S2可作为储氢的陷阱,提高钢板的抗鳞爆性能。
Si、Mn、P:固溶于铁素体和奥氏体中,可提高强度,但与此同时会使塑性下降,综合考虑,采用Mn强化时,Mn含量控制为1.0-1.5%,Si≤0.03%,P≤0.015%,采用Si强化时,Si含量控制为0.4~0.6%,Mn含量控制为0.15~0.3%,P≤0.015%,采用P强化时,P含量控制为0.035~0.055%,Si≤0.03%,Mn含量控制为0.15~0.3%。
本发明采用超低C、微合金化(添加Ti),实现铁素体中无固溶C、N间隙原子,低温大压下润滑轧制和高温卷取,获得粗大、尺寸均匀且具有{111}面织构的铁素体晶粒,提高产品的拉深成形性能,进一步,通过Si、Mn、P固溶强化,提高产品的抗拉强度和延伸率。此外,控制Ti、C、N、S的成分比例,形成粗大铁素体晶粒(TiC、TiN和Ti4C2S2),作为储氢的陷阱,提高钢板的抗鳞爆性能,实现产品的屈服强度为210~245MPa,抗拉强度≥320MPa,延伸率≥46%,n值≥0.3,r值≥1.3,TH值≥7.0,产品具有良好的成形性能,也别是具有良好的拉深成形性能,同时,具有较高的抗拉强度和抗鳞爆性能。
本发明所述的拉深性能良好的热轧酸洗搪瓷钢的生产方法,包括如下步骤:
1)冶炼、铸造;
按上述成分冶炼、精炼、连铸成坯;
2)轧制
终轧温度为750~800℃,轧制温度≤840℃的总压下率≥60%,且轧制温度≤840℃轧制过程中投入润滑乳液,所述润滑乳液油水比为1~5%;
3)冷却
冷却速度≤6℃/s;
4)卷取
卷取温度为720~780℃;
5)缓冷
钢板卷取后进行缓冷;
6)酸洗
缓冷后酸洗,去除钢板表面氧化皮。
优选的,步骤2)中,所述终轧温度为750~780℃。
优选的,步骤4)中,所述卷取温度为730~760℃。
优选的,步骤5)中,所述缓冷为堆垛缓冷或保温罩缓冷,所述堆垛缓冷时周围堆放热卷。
在本发明所述热轧酸洗搪瓷钢的生产方法中:
轧制过程中控制终轧温度为750~800℃,可以促进{111}织构的形成,提高产品的r值,粗化铁素体晶粒;若终轧温度高于800℃,铁素体晶粒变细,{111}织构减少,产品强度提高,延伸率、n值、r值都会降低,若终轧温度低于750℃,将无法确保卷取温度≥720℃,形变铁素体不能实现充分回复,反而会恶化产品的成形性能。
本发明轧制工艺采用低温润滑轧制,钢板在840℃以下发生铁素体轧制,轧制温度在铁素体相区范围控制总压下率≥60%,促进{111}织构的形成,获得具有{111}面织构的铁素体晶粒,提高产品r值。轧制温度≤840℃铁素体轧制过程中进行润滑轧制的目的是为了在厚度方向获得均匀的{111}织构,避免表面形成{110}织构,提高产品r值。润滑轧制时控制乳润滑乳液油水比为1~5%,若油水比小于1%,钢板与轧辊之间的摩擦系数较大,容易形成不利于成形的剪切织构,若油水比大于5%,轧制过程中容易打滑,轧制稳定性较差,产品成材率较低。
为促进铁素体充分回复,控制冷却速度≤6℃/s。
所述卷取采用高温卷取,卷取温度控制在720~780℃,结合钢卷缓冷,使轧制结束时沿轧制方向延伸的铁素体充分回复,形成粗大、均匀的铁素体晶粒,从而获得所需性能。若卷取温度低于720℃,形变铁素体无法充分回复,会恶化产品的成形性能。在现有工艺装备条件下,冷却过程中温度会降低,在设定的终轧温度下,780℃是铁素体充分回复,粗大、均匀的铁素体晶粒可实现的最高温度,卷取温度高于780℃,一方面对性能不会有显著的影响,另一方面实现难度也较高。
本发明的有益效果:
1.本发明成分设计采用超低碳、Ti微合金化学成分设计,进一步通过Si、Mn、P固溶强化,实现铁素体中无固溶C、N间隙原子,使热轧酸洗搪瓷钢的显微组织获得粗大、尺寸均匀且具有{111}面织构的多边形铁素体晶粒,提高产品的拉深性能。此外,控制Ti、C、N、S的成分比例,形成TiC、TiN和Ti4C2S2等不可逆的储氢陷阱,减少基体中的溶解氢,降低鳞爆的风险,提高钢板的抗鳞爆性能,使制备得到的热轧酸洗搪瓷钢产品具有良好的成形性能,特别是具有良好的拉深成形性能,还具有较高的抗拉强度和良好的抗鳞爆性能。
2.本发明在成分设计的基础上,轧制过程中,轧制温度在铁素体相区范围控制总压下率大于60%,结合润滑轧制,获得具有{111}面织构的铁素体晶粒,后续缓慢冷却和高温卷取,使铁素体充分回复,形成粗大、均匀的多边形铁素体晶粒,使热轧酸洗搪瓷钢的的屈服强度为210~245MPa,抗拉强度≥320MPa,延伸率≥46%,n≥值0.3,r值≥1.3,产品不仅具有良好的拉深成形性能,且具有较高的抗拉强度,此外,TH值≥7.0,具有良好的抗鳞爆性能。
3.本发明低温铁素体轧制过程中采用润滑轧制,润滑乳液油水比控制为1~5%,避免形成不利于成形的剪切织构,铁素体相累积一定压下率,生成利于冲压成形的{111}面织构,结合后续缓慢冷却和高温卷取,形成粗大、均匀的铁素体晶粒,从而获得所需力学性能。
4.本发明获得的热轧酸洗搪瓷钢具有较好的拉深性能,可用于拉深成形方式生产热水器内胆,替代生产效率低、成材率低的卷圆、焊接成形方式,对推动热水器内胆制造行业的升级、家电行业的绿色转型具有重要意义。
具体实施方式
下面结合实施例对本发明做进一步说明。
本发明实施例具体成分如表1,实施例工艺参数如表2所示,各实施例热轧酸洗搪瓷钢性能如表3所示。
本发明获得热轧酸洗搪瓷钢的显微组织为粗大、尺寸均匀且具有{111}面织构的多边形铁素体晶粒,其210~245MPa,抗拉强度≥320MPa,延伸率≥46%,n值≥0.3,r值≥1.3,TH值≥7.0,具有良好的成形性能,特别是具有良好的拉深成形性能,还具有较高的抗拉强度和良好的抗鳞爆性能,可用于拉深成形方式生产热水器内胆,替代生产效率低、成材率低的卷圆、焊接成形方式,对推动热水器内胆制造行业的升级、家电行业的绿色转型具有重要意义。
Claims (7)
1.一种拉深性能良好的热轧酸洗搪瓷钢,其化学成分重量百分比为:C:0.001~0.006%,N≤0.004%,S≤0.0080%,Als:0.015~0.040%,采用Mn强化时,Mn:1.0~1.5%,Si:0.001~0.03%,P≤0.015%;采用Si强化时,Si:0.4~0.6%,Mn:0.15~0.3%,P≤0.015%;采用P强化时,Si:0.001~0.03%,Mn:0.15~0.3%,P:0.035~0.055%;还包括Ti,且4[C]+3.42[N]+3[S]≤[Ti]≤0.065%,其余为Fe及其它不可避免的杂质。
2.如权利要求1所述的拉深性能良好的热轧酸洗搪瓷钢,其特征在于,所述热轧酸洗搪瓷钢的显微组织为均匀具有{111}面织构的多边形铁素体晶粒,且晶粒度不超过7级。
3.如权利要求1或2所述的拉深性能良好的热轧酸洗搪瓷钢,其特征在于,所述热轧酸洗搪瓷钢的屈服强度为210~245MPa,抗拉强度为≥320MPa,延伸率≥46%,r值≥1.3,n值≥0.3,TH值≥7.0。
4.如权利要求1或2或3所述的拉深性能良好的热轧酸洗搪瓷钢的生产方法,其特征在于,包括如下步骤:
1)冶炼、铸造
按权利要求1所述的成分冶炼、精炼、连铸成坯;
2)轧制
终轧温度为750~800℃,轧制温度≤840℃的总压下率≥60%,且轧制温度≤840℃轧制过程中投入润滑乳液,所述润滑乳液油水比为1~5%;
3)冷却
冷却速度≤6℃/s;
4)卷取
卷取温度为720~780℃;
5)缓冷
钢板卷取后进行缓冷;
6)酸洗
缓冷后酸洗,去除钢板表面氧化皮。
5.如权利要求4所述的拉深性能良好的热轧酸洗搪瓷钢的生产方法,其特征是,步骤2)中,所述终轧温度为750~780℃。
6.如权利要求4所述的拉深性能良好的热轧酸洗搪瓷钢的生产方法,其特征是,步骤4)中,所述卷取温度为730~760℃。
7.如权利要求4所述的拉深性能良好的热轧酸洗搪瓷钢的生产方法,其特征是,步骤5)中,所述缓冷为堆垛缓冷或保温罩缓冷,所述堆垛缓冷时周围堆放热卷。
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