CN104411856A - 具有低Si含量的钢带材 - Google Patents

具有低Si含量的钢带材 Download PDF

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CN104411856A
CN104411856A CN201380022075.3A CN201380022075A CN104411856A CN 104411856 A CN104411856 A CN 104411856A CN 201380022075 A CN201380022075 A CN 201380022075A CN 104411856 A CN104411856 A CN 104411856A
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steel band
less
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E·杰森
E·A·F·斯班
R·莫斯托特
T·A·科帕
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Tata Steel Ijmuiden BV
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Abstract

本发明提供了不显示虎皮斑的双相或复相钢带材。根据本发明，该钢带材以质量百分比计包含以下元素：C 0.08－0.11％；Mn 1.70－2.20％；Si至多0.1％；Cr 0.40－0.70％；Mo至多0.3％；Ni至多1.0％，Al 0.01－1.50％；Nb至多0.07％；和任选地选自以下的一种或多种元素：P等于或大于0.005％；N等于或小于0.015％；Ti等于或小于0.1％；V等于或小于0.1％；B等于或小于0.01％，其中Cr、Mo和Ni的和为至少0.5％；余量为Fe和不可避免的杂质。

Description

具有低Si含量的钢带材
本发明涉及具有低硅含量的钢带材，特别是热浸镀锌的钢带材，更特别是热浸镀锌的双相或复相钢带材。
就强度和延展性(可成形性)而言具有平衡性质的双相(DP)钢带材在本领域中是公知的。在冷轧的DP钢带材中，出于成本降低和/或控制、固溶强化、避免碳化物析出的原因，硅是非常常见的合金化元素，考虑到延展性(延伸率)其是有利的。然而，Si引起与表面有关的问题。在热带材轧机和退火生产线中加工期间形成的Si氧化物增加所谓的“虎皮斑”出现的风险，这影响外观和可涂覆性。因此，通常限制硅在DP钢中、特别是在热浸镀锌的(HDG)DP钢中的使用。通常DP钢中的Si含量为0.2－0.3wt.％(在HDG DP片材中)和0.2－0.5wt.％(在未涂覆的钢片材中)。
由EP 2169091A1知道具有低屈服强度的高强度热浸镀锌的钢片材。该钢组合物以质量百分比计包括0.01－0.12％的C、0.2％或更少的Si、小于2％的Mn、0.04％或更少的P、0.02％或更少的S、0.3％或更少的sol.Al、0.01％或更少的N、0.3－2％Cr，还满足条件2.1≤[Mneq]≤3和0.24≤[％Cr]/[％Mn]，余量为铁和不可避免的杂质。该钢显微组织由铁素体和第二相组成，其中第二相的面积比为2－25％，第二相中珠光体或贝氏体的面积比为0－20％，第二相的平均晶粒直径为0.9－7微米，并且第二相中具有小于0.8微米的晶粒直径的晶粒的面积比小于15％。通过基于低Si和低Al的合金化原理的多个实施例例证了该钢组合物。
本发明的一个目的是提供一种钢组合物，例如双相(DP)或复相(CP)钢组合物，其结合了就强度和延展性而言所需的显微组织性质与足够的表面品质(特别是避免了虎皮斑的出现)。
本发明的另一个目的是提供这样的具有良好可涂覆性的钢组合物。
根据本发明，具有为600MPa钢类的极限拉伸强度Rm的钢带材，其以质量百分比计包含以下元素：
和任选地选自以下的一种或多种元素：
其中Cr、Mo和Ni的和为至少0.5％；
余量为Fe和不可避免的杂质。
出乎意料地发现，根据本发明的钢组合物在可接受的水平的强度和在600MPa水平下与传统(HDG)DP钢带材相当的可成形性性质下不显示虎皮斑。
关于冶金方面，认为适用以下准则：
考虑到可点焊性，C为0.08－0.11％。如果C低于0.08％，那么碳含量太低而不产生DP或CP显微组织。
Si为至多0.1％。已显示Si是造成虎皮斑的主要因素。为了以可靠的方式避免这些表面缺陷出现的风险，将量限制为0.1％的最大值。优选地，Si含量为0.02－0.08％。
通常Al和Si的添加对钢的可成形性具有相似的有益影响。然而，考虑到虎皮斑Al具有可忽略的影响。因此Al为0.01－1.5％，例如0.01－1.10％。优选地，Al的最小量大于0.1％，更优选大于约0.2％，并且Al含量有利地小于0.5％，例如约0.3％。
Mn以1.7－2.20％、优选1.70－1.95的水平存在，由此补偿由低Si含量引起的强度降低。
出于强度和硬化原因，还存在Cr、Mo和Ni，其确定本发明的钢带材的DP或CP显微组织。根据本发明这些元素的总和为至少0.5％。各个元素的量为
Cr 0.4－0.7％，优选0.5－0.6％；
Mo至多0.3％，优选小于0.01％；和
Ni 0－1.0％，优选0－0.05％。
该钢带材组合物可任选包含少量的其它合金化元素。不可避免的杂质和其它合金化元素的和有利地小于1.25％。优选地，额外的合金化元素和各个杂质的上限为
优选地，根据本发明的钢带材具有一种显微组织，其包含：马氏体2－50％，优选至少5％；铁素体50－98％；和任选地珠光体小于3％，优选为约0％。有利地，晶粒尺寸为约30微米或更小。
在一个优选的实施方案中，用包含Zn的涂层涂覆钢带材。尽管可以以各种方式施加涂层，但是优选使用标准GI涂覆浴的热浸镀锌。还可施加其它的Zn涂层。一个实例包括根据WO2008102009的Zn合金涂层，特别是由0.3－4.0％的Mg和0.05％－6.0％的Al以及任选至多0.2％的一种或多种额外元素连同不可避免的杂质和余量锌组成的锌合金涂覆层。通常以小于0.2重量％的少量添加的额外元素可选自Pb或Sb、Ti、Ca、Mn、Sn、La、Ce、Cr、Ni、Zr或Bi。通常添加Pb、Sn、Bi和Sb来形成锌花。优选地，锌合金中额外元素的总量为至多0.2％。这些少量的额外元素不会将涂层或浴的性质改变至对于通常应用的明显程度。优选地，当一种或多种额外元素存在于锌合金涂层中时，每种以<0.02重量％的量存在，优选每种以<0.01重量％的量存在。通常仅添加额外元素来防止在用于热浸镀锌的具有熔融锌合金的浴中的浮渣形成，或在涂覆层中形成锌花。
将通过以下实施例进一步说明本发明：
实施例1－4
通过通常的冷轧和连续退火工艺制造具有如表1中指出的组成的片材。在热轧后，将带材冷轧到表2中列出的最终厚度。对于实施例1－2，通过标准炼钢和轧制路线来制备冷轧带材。在冷轧后，在标准退火生产线中连续退火该材料。在表3中呈现了实施例1和2的相关数据。在加热至温度T1后，进行缓慢冷却(速率1－10℃/s)至T2并且随后快速冷却(速率20－60℃/s)至温度T3。接下来，将该材料镀锌。以类似的方式制备实施例3－4。
对于虎皮斑的存在，还目视检查了片材。没有观察到虎皮斑。表面品质几乎是完全光洁度的(full-finish)。还实现了良好的可涂覆性。
表1.组成实施例1－4
表2.物理性质实施例1－4
表3退火数据实施例1－2
实施例 T1(℃) T2(℃) T3(℃)
1 788 678 464
2 785 680 410

Claims (11)

1.具有为600MPa钢类的极限拉伸强度Rm的钢带材，以质量百分比计包含以下元素：
和任选地选自以下的一种或多种元素：
其中Cr、Mo和Ni的和为至少0.5％；
余量为Fe和不可避免的杂质。
2.根据权利要求1的钢带材，其中Si为至多0.08％。
3.根据权利要求1或权利要求2的钢带材，包含
Mn 1.70－1.95％；
Si 0.02－0.08％；
Al 0.1－0.5％。
4.根据前述权利要求中任一项的钢带材，包含
Cr 0.50－0.60％；
Mo 至多0.01％；
Ni 至多0.05％。
5.根据前述权利要求中任一项的钢带材，包含
Nb 至多0.005％，
P  小于0.05％。
6.根据前述权利要求中任一项的钢带材，其中Al为至少0.2％。
7.根据前述权利要求中任一项的钢带材，具有一种显微组织，其包含
马氏体 2－50％，优选至少5％；
铁素体 50－98％；
和任选地珠光体小于3％，优选为约0％。
8.根据前述权利要求中任一项的钢带材，其中晶粒尺寸为约30微米或更小。
9.根据前述权利要求中任一项的钢带材，其涂覆有包含Zn的涂层。
10.根据权利要求9的钢带材，其为热浸镀锌的。
11.根据权利要求9或权利要求10的钢带材，其中该涂层以质量百分比计包含：0.3－4.0％的Mg和0.05％－6.0％的Al以及任选至多0.2％的一种或多种额外元素连同不可避免的杂质和余量锌。
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