CN117448703A - 一种耐环境腐蚀的550MPa级冷轧钢及生产方法 - Google Patents
一种耐环境腐蚀的550MPa级冷轧钢及生产方法 Download PDFInfo
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Classifications
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
一种耐环境腐蚀的550MPa级冷轧钢,其组分及wt%为:C:0.08~0.12%,Si:0.15~0.35%,Mn:0.6~1.0%,Alt:0.02~0.06%,P:0.08~0.14%,S:≤0.007%,Cu:0.30~0.60%,Cr:0.8~2.0%,Ni:0.10~0.20%,Sb:0.04~0.08%,Nb:0.01~0.02%,Ti:0.02~0.04%,N≤0.006%;步骤:冶炼后浇铸成坯;对铸坯加热;粗轧;精轧;卷取;经矫直破鳞及酸洗后冷轧;在保护气氛下进行连续退火。本发明既保证了带钢屈服强度≥550MPa,抗拉强度≥650MPa,断后伸长率A≥22%,又相对于Q345B的腐蚀速率≤40%;再本发明通过连续退火更保证了钢板的板形及表面质量、以及钢卷径向及宽度方向组织的均匀性、消除内应力,而获得均匀的性能。
Description
技术领域
本发明涉及一种冷轧钢及生产方法,具体属于一种耐环境腐蚀的550MPa级冷轧钢及生产方法。
背景技术
耐候钢是指通过添加耐腐蚀合金元素,使钢材具有良好耐大气腐蚀性能的低合金高强度钢。耐候钢能阻碍雨水、氧气、污染物等对钢材表面的破坏。在现有技术中,人们为了提高耐候钢的强度,通常采用添加较多合金元素的方式来提高材料的强度。随着低碳环保越来越被重视,如何绿色低成本生产高性能的钢铁材料也为各企业研发的重点。如经检索的:
中国专利申请号为CN201010291603.3的文献,公开了《一种高耐蚀高强度铁道车辆用耐候钢及其制造方法》,其化学成分按质量百分比计:C:0.015%~0.065%、Si:0.10%~0.50%、Mn:0.20%-0.60%、P:0.015%以下、S:0.008%以下、Ti:0.01%~0.08%、Nb:0.005%~0.05%、Cr:2.15%~4.0%、Ni:0.12%~1.0%,Cu:0.20%~0.60%、Al:0.01%~0.05%,余量为Fe及不可避免的杂质。其工艺:转炉控制时铬含量1.5%;连铸坯加热温度为1200~1260,粗轧开轧温度1100℃以上,精轧开轧温度1100~980℃,终轧温度950~880℃,卷取温度560~660℃,本发明钢钢屈服强度≥550MPa,抗拉强度≥650MPa,该文献虽可以实现强度与耐蚀性的匹配,但添加合金元素较多,生产成本较高。
中国专利申请号为CN200910056603.2的文献,其公开了《一种屈服强度为550MPa级的韧性优良的高耐蚀性含Cr耐候钢及其制造方法》。所述耐候钢的成分质量百分比含量(wt%)为:C 0.02-0.08、Si 0.15-0.55、Mn 0.2-1.0、P≤0.01、S≤0.006、Cu 0.2-0.5、Cr2.5-7.0、Ni0.2-1.2、Nb 0.02-0.06、Al 0.01-0.05、N≤0.005、Ti 0.01-0.10,余量为Fe和不可避免的杂质。所述钢制成的钢板具有550MPa以上的屈服强度和优良的韧性,同时其相对腐蚀率在目前传统耐候钢的基础上降低了1倍,其虽满足铁路车辆用钢提高耐腐蚀的要求,达到延长服役期限,降低维修成本的目标,该文献虽可以实现强度与耐蚀性的匹配,但添加合金元素较多,生产成本较高。
中国专利申请号为CN201811019834.1的文献,其公开了《一种550MPa级热轧集装箱用耐候钢及其制造方法》,所述集装箱用耐候钢,按质量百分比,包括如下组分,C:0.05~0.09%,Mn:0.55~0.80%,Si:0.35~0.50%,Al:0.020~0.050%,Cr:0.50~0.70%,Cu:0.20~0.35%,Ti:0.065~0.085%,P:不大于0.015%,S:不大于0.005%,N:不大于0.060%,O:不大于0.005%;余量为铁和不可避免的杂质,该高强集装箱用耐候钢,虽成本低,同时具有优异的性能和良好耐腐蚀性能,完全满足用户的使用需求,促进了集装箱领域产品的轻量化、大型化,该文献虽可以实现相应的强度级别,但其耐蚀性能较弱。
中国专利申请号为CN201610504636.9的文献,公开了《一种低成本550MPa级热轧集装箱用耐候钢及其制造方法》。其钢中含有C 0.049%~0.069%,Si 0.20%~0.30%,Mn0.51%~0.79%,P≤0.020%,S≤0.006%、Als 0.015%~0.045%,Cr 0.31%~0.41%,Ni0.079%~0.099%,Cu 0.21%~0.29%,Ti 0.057%~0.077%,N≤0.006%,其余为Fe和不可避免的杂质。铸坯厚度为200~230mm,铸坯加热温度≥1250℃,精轧开轧温度为1080~1100℃,精轧终轧温度为921~949℃,轧后采用层流冷却,冷却速度>20℃/s,卷取温度为619~649℃,卷取后进入缓冷罩进行缓冷,若成品厚度≤2.0mm,需要进行平整。钢板的厚度为1.5~5.0mm,用于集装箱行业,该文献虽可以实现相应的强度级别,但其耐蚀性能较弱。
发明内容
本发明在于克服现有技术存在的不足,提供一种在保证屈服强度≥550MPa,抗拉强度≥650MPa,断后伸长率A≥22%,相对于Q345B其腐蚀速率≤40%,且Mn、Cu、Cr、Ni、Nb、Ti合金元素添加量少的耐环境腐蚀的550MPa级冷轧钢及生产方法。
实现上述目的的措施:
一种耐环境腐蚀的550MPa级冷轧钢,其组分及重量百分比含量为:C:0.08~0.12%,Si:0.15~0.35%,Mn:0.6~1.0%,Alt:0.02~0.06%,P:0.08~0.14%,S:≤0.007%,Cu:0.30~0.60%,Cr:0.8~2.0%,Ni:0.10~0.20%,Sb:0.04~0.08%,Nb:0.01~0.02%,Ti:0.02~0.04%,N≤0.006%,其余为Fe和不可避免的杂质。
优选地:Ti的重量百分比含量为0.025~0.032%。
优选地:Cu的重量百分比含量为0.34~0.53%。
优选地:Cr的重量百分比含量为0.86~1.63%。
优选地:Sb的重量百分比含量为0.048~0.073%。
生产一种耐环境腐蚀的550MPa级冷轧钢的方法,其步骤:
铁水冶炼→转炉冶炼→LF精炼→连铸→热轧→卷取→矫直→酸洗→五机架冷轧→电解脱脂→连续退火→平整;
1)经冶炼后浇铸成坯;
2)对铸坯加热,控制铸坯入炉温度不低于800℃,铸坯加热温度控制在1180~1250℃;
3)进行粗轧,并控制粗轧温度在1080~1120℃;
4)进行精轧,并控制其终轧温度在870~910℃;
5)进行卷取,控制卷取温度在600~660℃;
6)经矫直破鳞及酸洗后,进行冷轧,控制酸洗钢带运行速度在60~80m/min,酸洗温度在70~90℃;控制冷轧累计压下率在60~80%,并使其中一个道次的压下率在40~50%;
7)在保护气氛下进行连续退火,其工艺路线为:加热—均热—缓冷—快冷—时效—水淬—平整—卷取包装,其中控制:
在加热速率为2~10℃/s下使均热温度达到800~850℃,并在此温度下保温40~160s;缓冷温度在660~720℃,缓冷速率在5~20℃/s;快冷结束温度在400~430℃,快冷速度在30~80℃/s;时效温度在380~430℃,时效时间在200~500s;
平整压下率在0.7~1.8%,并根据成品厚度设定对应平整延伸率即:当成品厚度≤
1.2mm时,平整延伸率控制在0.7~1.4%;当成品厚度不低于1.2mm时,平整延伸率控制在1.4~1.8%;
所述保护气氛为常规的氮气与氢气的混合气体。
优选地:在连续退火中,加热速率为3.5~8.5℃/s下使均热温度达到806~842℃,并在此温度下保温55~145s;缓冷温度在660~710℃,缓冷速率在5.5~15℃/s;快冷结束温度在40~415℃,快冷速度在36~73℃/s;时效温度在383~423℃,时效时间在215~455s。
本发明中各组分及主要工艺的作用及机理
C:碳为钢中最常用及且最经济的强化元素,碳含量的增加可以有效的提高钢材的强度,但过高C含量会影响塑性及焊接性能,因此钢中的C含量选择为0.08~0.12%。
Mn:Mn是一种固溶强化元素。提高Mn含量可以有效的提高钢的强度,但Mn含量增加降低产品韧性,弱化延伸率、扩孔和冷弯性能,因此本发明中Mn含量为0.6~1.0%。
Si:Si是固溶强化元素,可提高强度及改善钢的耐候性,有利于细化锈层中α-FeOOH相,但过高的Si含量热轧过程易于条纹状氧化铁皮,不易去除,因此本发明中Si含量为0.15~0.35%。
Alt:Al为脱氧剂,脱O以减少钢中的夹杂物,提高Mn含量可以有效的提高钢的强度,但,因此本发明中Al含量为0.02~0.06%。
P:P通常为钢中的杂质元素,因易于在晶界偏聚,且可能产生磷脆,一般钢种将其控制在较低的水平,但P和Cu复合添加可有效提高耐蚀性能,为最经济的耐蚀性元素,因此P含量为0.08~0.14%。
S:S为钢中的杂质元素,形成硫化物影响延展性,应控制在较低的水平,但控制较低水平需更长的冶炼时间及耗费更多的压块材料进而增加成本,根据成本与性能综合考虑控制在0.007%以下。
Cu:Cu可提高钢材的耐蚀性,同时可以增加钢的强度,特别是屈强比,但过高的Cu含量易于Cu在钢板表面富集,产生铜脆裂纹,因此本发明中Cu含量为0.30~0.60%。
Cr:Cr为耐蚀性元素,Cr能在钢表面富集进而形成致密稳定的锈层,防止大气中的水和氧气等进一步向钢基扩散锈蚀钢基,提高钢的纯化能力。因此本发明中Cr含量0.8~2.0%。
Ni:Ni较为稳定,加入Ni能使钢的自腐蚀电位向正方向变化,增加钢的稳定性。因此本发明中Ni含量0.10~0.20%。
Sb:Sb通常在钢中通常作为杂质元素存在,但Sb能显著促进耐蚀元素氧化层中的析出与富集,从而氧化铁皮的致密性和耐腐蚀性能,过高的添加Sb会在钢种形成偏析造成钢质不均匀。因此本发明中Sb含量0.04~0.08%。
Nb:Nb可以与C形成纳米级的第二相,阻碍晶界的迁移与晶粒的长大,但过高的Nb含量生产成本的增加,因此本发明中Nb的含量为:0.01~0.02%。
Ti:Ti可以起到析出强化的作用,细化带钢晶粒,过高的Ti的添加易于在钢中形成粗大的第二相使析出强化效果发生减弱,因此本发明中Ti的含量为0.02~0.04%。
N:N为钢中的杂质元素,过高的N易于与钢种的Al形成AlN颗粒,影响材料的性能跟,因此本发明中控制N的含量为≤0.006%。
本发明之所以控制连铸后板坯连铸后,直接进入热轧加热炉加热,要求入炉温度≥800℃,因钢中加入一定含量的Cu、Cr、Ni等元素,高温进入加热炉保证板坯宽度及长度方向温度的均匀性,避免温度不均匀引起的应力差而产生的开裂。
热轧较高的终轧温度避免因终轧温度低进入α+γ两相区带,温度始终处于奥氏体相区,奥氏体与铁素体的硬度存在差异,避免两相区轧制轧制力波动及组织的不均匀。热轧卷取温度600~660℃,应设计钢种强度较高,为了获得更好的板形,因此选取卷曲温度600~660℃。
酸洗带速60~80m/min,酸洗温度70~90℃,因钢中添加了Si还添加了耐蚀性元素Cu、Cr、Ni等,抗酸腐蚀性能较普通钢要好,上述工艺保证表面氧化铁皮的有效去除。
冷轧过程中采用高的冷轧压下率,可以将热轧后组织破碎细化,因此本发明中冷轧总压下率60~80%。
冷轧采用五机架连轧机组进行轧制,过程中一次压下率为50~60%,可充分细化钢中的组织,在后续四个机架轧制变形较小,获得更好的表面与尺寸精度,因此本发明中一次冷轧压下率50~60%。
在连续退火过程中,包括钢卷加热、均热保温,缓冷、快冷、时效、水淬等阶段,其中加热速率为2~10℃/s,均热温度为800~850℃,保温时间40~160s;缓冷温度为660~720℃,缓冷速率为5~20℃/s,快冷速率为30~80℃/s,快冷结束温度为400~430℃,时效温度380~430℃,时效时间200~500s,保护气氛采用氮气+氢气。
采用连续退火炉生产,由于耐候钢板板形要求较高,连续退火通板过程中带钢带张力运行,且连续退火炉采用氮气+氢气作为保护气氛,氮气为惰性气体,氢气具有还原性,可以保证带钢在连续退火中获得更优的板形及表面状态。
退火后带钢进行平整,采用0.8~1.8%的平整延伸率,保证带钢获得相应的屈服强度,最终获得具有良好表面及尺寸精度的耐候钢。
本发明与现有技术相比既保证了带钢屈服强度≥550MPa,抗拉强度≥650MPa,断后伸长率A≥22%,又相对于Q345B的腐蚀速率≤40%;再本发明采用合金添加量低及生产效率较高的连续退火产线,实现钢材的屈服强度为550MPa的耐候钢产品生产;连续退火工艺有利于保证钢板的板形及表面质量,有利于钢卷径向及宽度方向组织的均匀性,消除内应力,获得均匀的性能。
附图说明
图1为本发明钢的金相组织图。
具体实施方式
下面对本发明予以详细描述:
表1为本发明各实施例及对比例的化学成分列表;
表2为本发明各实施例及对比例的主要工艺参数列表;
表3为本发明各实施例及对比例性能检测情况列表。
本发明各实施例按照以下步骤生产
1)经冶炼后浇铸成坯;
2)对铸坯加热,控制铸坯入炉温度不低于800℃,铸坯加热温度控制在1180~1250℃;
3)进行粗轧,并控制粗轧温度在1080~1120℃;
4)进行精轧,并控制其终轧温度在870~910℃;
5)进行卷取,控制卷取温度在600~660℃;
6)经矫直破鳞及酸洗后,进行冷轧,控制酸洗钢带运行速度在60~80m/min,酸洗温度在70~90℃;控制冷轧累计压下率在60~80%,并使其中一个道次的压下率在40~50%;
7)在保护气氛下进行连续退火,其工艺路线为:加热—均热—缓冷—快冷—时效—水淬—平整—卷取包装,其中控制:
在加热速率为2~10℃/s下使均热温度达到800~850℃,并在此温度下保温40~160s;缓冷温度在660~720℃,缓冷速率在5~20℃/s;快冷结束温度在400~430℃,快冷速度在30~80℃/s;时效温度在380~430℃,时效时间在200~500s;
平整压下率在0.7~1.8%,并根据成品厚度设定对应平整延伸率即:当成品厚度≤
1.2mm时,平整延伸率控制在0.7~1.4%;当成品厚度不低于1.2mm时,平整延伸率控制在1.4~1.8%;
所述保护气氛为常规的氮气与氢气的混合气体。
表1本发明各实施例及对比例的化学成分列表(wt%)
表2本发明各实施例及对比例的主要工艺参数列表
续表2(冷轧产品连续退火阶段的工艺参数)
表3本发明各实施例及对比例的力学性能检测结果列表
说明:
失重率的检测条件是:根据《TB/T 2375-93铁路用耐候钢周期浸润腐蚀方法》,采用周浸循环腐蚀加速试验。试验条件:NaHSO3溶液浓度0.01M,PH值在4.4~4.8范围,液槽中溶液总量为30±1.5L,溶液温度为45±2℃。补给溶液浓度:0.02M NaHSO3,每天加补给液至液槽中原始溶液容积,补给液现用现配,自动补给。箱内相对湿度为70±5%RH。周浸周期:60±3分钟,其中浸润时间为12±1.5分钟。烘烤后试样表面最高温度:70±10℃;测试总时间为72h。
从表3可以看出,在本发明要求的权利范围内,可以达到目标,同时不同成品厚度的钢板,力学性能与耐蚀性良好,性能且稳定。
本具体实施方式仅为最佳例举,并非对本发明技术方案的限制性实施。
Claims (7)
1.一种耐环境腐蚀的550MPa级冷轧钢,其组分及重量百分比含量为:C:0.08~0.12%,Si:0.15~0.35%,Mn:0.6~1.0%,Alt:0.02~0.06%,P:0.08~0.14%,S:≤0.007%,Cu:0.30~0.60%,Cr:0.8~2.0%,Ni:0.10~0.20%,Sb:0.04~0.08%,Nb:0.01~0.02%,Ti:0.02~0.04%,N≤0.006%,其余为Fe和不可避免的杂质。
2.如权利要求1所述的一种耐环境腐蚀的550MPa级冷轧钢,其特征在于:Ti的重量百分比含量为0.025~0.032%。
3.如权利要求1所述的一种耐环境腐蚀的550MPa级冷轧钢,其特征在于:Cu的重量百分比含量为0.34~0.53%。
4.如权利要求1所述的一种耐环境腐蚀的550MPa级冷轧钢,其特征在于:Cr的重量百分比含量为0.86~1.63%。
5.如权利要求1所述的一种耐环境腐蚀的550MPa级冷轧钢,其特征在于:Sb的重量百分比含量为0.048~0.073%。
6.生产如权利要求1所述的一种耐环境腐蚀的550MPa级冷轧钢的方法,其步骤:
铁水冶炼→转炉冶炼→LF精炼→连铸→热轧→卷取→矫直→酸洗→五机架冷轧→电解脱脂→连续退火→平整;
1)经冶炼后浇铸成坯;
2)对铸坯加热,控制铸坯入炉温度不低于800℃,铸坯加热温度控制在1180~1250℃;
3)进行粗轧,并控制粗轧温度在1080~1120℃;
4)进行精轧,并控制其终轧温度在870~910℃;
5)进行卷取,控制卷取温度在600~660℃;
6)经矫直破鳞及酸洗后,进行冷轧,控制酸洗钢带运行速度在60~80m/min,酸洗温度在70~90℃;控制冷轧累计压下率在60~80%,并使其中一个道次的压下率在40~50%;
7)在保护气氛下进行连续退火,其工艺路线为:加热—均热—缓冷—快冷—时效—水淬—平整—卷取包装,其中控制:
在加热速率为2~10℃/s下使均热温度达到800~850℃,并在此温度下保温40~160s;缓冷温度在660~720℃,缓冷速率在5~20℃/s;快冷结束温度在400~430℃,快冷速度在30~80℃/s;时效温度在380~430℃,时效时间在200~500s;
平整压下率在0.7~1.8%,并根据成品厚度设定对应平整延伸率即:当成品厚度≤1.2mm时,平整延伸率控制在0.7~1.4%;当成品厚度不低于1.2mm时,平整延伸率控制在1.4~1.8%;
所述保护气氛为常规的氮气与氢气的混合气体。
7.如权利要求6所述的一种耐环境腐蚀的550MPa级冷轧钢的生产方法,其特征在于:在连续退火中,加热速率为3.5~8.5℃/s下使均热温度达到806~842℃,并在此温度下保温55~145s;缓冷温度在660~710℃,缓冷速率在5.5~15℃/s;快冷结束温度在40~415℃,快冷速度在36~73℃/s;时效温度在383~423℃,时效时间在215~455s。
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