CN113430460A - 一种屈服强度690MPa级低成本高强非调质钢板及其制造方法 - Google Patents

一种屈服强度690MPa级低成本高强非调质钢板及其制造方法 Download PDF

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CN113430460A
CN113430460A CN202110682050.2A CN202110682050A CN113430460A CN 113430460 A CN113430460 A CN 113430460A CN 202110682050 A CN202110682050 A CN 202110682050A CN 113430460 A CN113430460 A CN 113430460A
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刘卫航
刘卫丽
钟滨
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Baosteel Zhanjiang Iron and Steel Co Ltd
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Abstract

本发明公开了一种屈服强度690MPa级低成本高强非调质钢板及制造方法,其中,钢板的化学成分重量百分比为:C:0.06‑0.09%;Si:0.1‑0.5%;Mn:1.3‑2.0%;P≤0.015%;S≤0.002%;Nb:0.03‑0.06%;Ti:0.01‑0.02%;Al:0.025‑0.045%;B:0.001‑0.0016%;其余为Fe和不可避免杂质。上述钢板的制造方法为,经冶炼浇铸、加热、两阶段轧制、冷却、缓冷的工序。本发明具体采用纯DQ冷却工艺+冷后堆缓冷自回火工艺,充分发挥合金元素作用,采用控制轧制及强化冷却的方式达到钢板所需性能。

Description

一种屈服强度690MPa级低成本高强非调质钢板及其制造方法
技术领域
本发明属于690Mpa级高强钢板制造技术领域,具体涉及一种屈服强度大于690MPa级低成本高强钢板及其制造方法。
背景技术
目前针对690MPa级高强结构钢的生产主要用于煤矿机械、工程机械等行业,生产工艺一般采用调质态或者TMCP+T态生产,但该工艺生产制造成本相对较高。
例如公开号CN109055657A的专利-“690MPa级低成本高强韧贝氏体钢板及其生产工艺”钢的化学成分重量百分比为C本发明公开了一种690MPa级低成本高强韧贝氏体钢板及其生产工艺,钢板化学成分组成及其质量百分含量为C:0.03~0.09%、Si:0.10~0.30%、Mn:1.50~1.80%、Nb:0.030~0.070%、Ti≤0.02%、Mo:0.10~0.40%、Ni:0.20~0.30%、Alt≤0.045%、Bt≤0.002%,余量为Fe和不可避免的杂质;生产工艺包括冶炼、连铸、加热、轧制和热处理工序。
又例如公开号CN102851604A的专利-“一种屈服强度690MPa级高强度钢板的生产方法”其成分重量百分比为:所述钢板的化学成分按重量百分比为C:0.04~0.09%、Si:0.25~0.50%、Mn:1.4~1.7%、P:≤0.020%、S:≤0.010%、Cr≤0.45%、Mo≤0.20%、Nb:0.04~0.05%、V:0.05~0.07%、Ti:0.005~0.020%、B:0.0005~0.0025%,余量为Fe和不可避免的杂质。采用低碳微合金化设计,控制轧制后通过在线淬火(DQ)+回火工艺(T),获得了回火马氏体+回火贝氏体的整合组织,从而获得了强度、塑性和韧性的良好匹配,
上述两个公开的专利,从生产工艺及合金成分设计方面来看,合金元素种类多、含量高,生产工序复杂,进而生产制造成本较高。
发明内容
本发明的目的在于提供一种屈服强度690MPa级低成本高强钢板及其制造方法,打破原始调质钢及DQ+T钢的生产观念,采用控制轧制及强化冷却工艺,充分发挥合金元素、及冷后堆缓冷的自回火作用达到钢板所需性能。
为了实现上述目的,本发明采用的技术方案是:一种屈服强度690MPa级低成本高强非调质钢板,其特征在于:其化学成分重量百分比为:C:0.06-0.09%;Si:0.1-0.5%;Mn:1.3-2.0%;P≤0.015%;S≤0.002%;Nb:0.03-0.06%;Ti:0.01-0.02%;Al:0.025-0.045%;B:0.001-0.0016%;其余为Fe和不可避免杂质。
进一步地,所述钢板的屈服强度≥690MPa,抗拉强度770MPa,断后伸长率≥14%,-20℃纵横向冲击功≥47J。
本发明还公开一种上述屈服强度690MPa级低成本高强非调质钢板的制造方法,其特征在于:包括如下步骤:
(1)冶炼、浇铸:按照所述屈服强度690MPa级低成本高强非调质钢板的化学成分及配比进行冶炼,转炉出钢后然后通过LF+RH真空处理系统有效减少钢种的S元素及气体元素,再进行连铸机浇铸;
(2)加热:加热温度:1110-1170℃,保温时间220-280min;
(3)轧制阶段:轧制阶段分两阶段轧制,第一阶段在奥氏体完全再结晶区大压下率进行连续轧制,道次压下率≥8%,第一阶段终轧温度≥975℃;第二阶段采用控制轧制,即在奥氏体未再结晶区轧制,控轧开轧温度控制在870℃~920℃,终轧温度820℃~880℃,每道次压下率≥8%;
(4)冷却阶段:钢板轧制结束后,立即送入加速冷却设备,钢板开冷温度在770-830之间,冷区速率23-30℃/S,终冷温度420-500℃
(5)缓冷工序:钢板冷却完成后,立即完成热矫直下线堆缓冷,堆缓冷温度≥300℃,堆缓冷时间≥24h。
本发明的有益效果是:本发明采用纯DQ冷却工艺+冷后堆缓冷自回火工艺,充分发挥合金元素作用,采用控制轧制及强化冷却的方式达到钢板所需性能。与现有技术相比,在保证了力学性能的前期下,减少贵金属元素的加入种类及含量,精简生产工序,生产制造成本相应的降低。
(1)本发明针对690MPa级高强结构用非调质钢采用Si-Mn-B-Nb-Al合金成分设计,钢板合金成本大大降低。
(2)本发明打破传统工艺设计思路,采用轧后加速冷却并快速进行堆缓冷工序。利用堆缓冷的自回火功能代替原始热处理炉回火工艺,进一步降低生产制造成本,并有效提高生产效率。
附图说明
图1为本发明实施例1的金相照片。
具体实施方式
本发明一种屈服强度690MPa级低成本高强非调质钢板,其化学成分重量百分比为:C:0.06-0.09%;Si:0.1-0.5%;Mn:1.3-2.0%;P≤0.015%;S≤0.002%;Nb:0.03-0.06%;Ti:0.01-0.02%;Al:0.025-0.045%;B:0.001-0.0016%;其余为Fe和不可避免杂质。
所述钢板的屈服强度≥690MPa,抗拉强度770MPa,断后伸长率≥14%,-20℃纵横向冲击功≥47J。
上述屈服强度690MPa级低成本高强非调质钢板的制造方法,包括如下步骤:
(1)冶炼、浇铸:按照所述屈服强度690MPa级低成本高强非调质钢板的化学成分及配比进行冶炼,转炉出钢后然后通过LF+RH真空处理系统有效减少钢种的S元素及气体元素,再进行连铸机浇铸。
(2)加热:加热温度:1110-1170℃,保温时间220-280min。
(3)轧制阶段:轧制阶段分两阶段轧制,第一阶段在奥氏体完全再结晶区大压下率进行连续轧制,道次压下率≥8%,第一阶段终轧温度≥975℃;第二阶段采用控制轧制,即在奥氏体未再结晶区轧制,控轧开轧温度控制在870℃~920℃,终轧温度820℃~880℃,每道次压下率≥8%。
(4)冷却阶段:钢板轧制结束后,立即送入加速冷却设备,钢板开冷温度在770-830之间,冷区速率23-30℃/S,终冷温度420-500℃。
(5)缓冷工序:钢板冷却完成后,立即完成热矫直下线堆缓冷,堆缓冷温度≥300℃,堆缓冷时间≥24h。
具体的,钢板化学成分的配比及制造方法中涉及的参数,可以在对应的范围内选择设置,下面通过举例说明,如表1、表2所示。
Figure BDA0003123098430000031
Figure BDA0003123098430000041
以上实施例对应的力学性能测验结果如表3所示。
Figure BDA0003123098430000042
由表1、表2和表3中所列的实施例可以看出,采用本发明制备的钢板的抗拉强度、屈服强度、断后伸长率均满足用户要求,-20夏比冲击功≥200J、其与现有技术相比,在保证了力学性能的前期下,减少贵金属元素的加入种类及含量,精简生产工序,生产制造成本相应的降低。
以上仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (3)

1.一种屈服强度690MPa级低成本高强非调质钢板,其特征在于:其化学成分重量百分比为:C:0.06-0.09%;Si:0.1-0.5%;Mn:1.3-2.0%;P≤0.015%;S≤0.002%;Nb:0.03-0.06%;Ti:0.01-0.02%;Al:0.025-0.045%;B:0.001-0.0016%;其余为Fe和不可避免杂质。
2.根据权利要求1所述的屈服强度690MPa级低成本高强非调质钢板,其特征在于:其屈服强度≥690MPa,抗拉强度770MPa,断后伸长率≥14%,-20℃纵横向冲击功≥47J。
3.一种如权利要求1或2所述屈服强度690MPa级低成本高强非调质钢板的制造方法,其特征在于:包括如下步骤:
(1)冶炼、浇铸:按照所述屈服强度690MPa级低成本高强非调质钢板的化学成分及配比进行冶炼,转炉出钢后然后通过LF+RH真空处理系统有效减少钢种的S元素及气体元素,再进行连铸机浇铸;
(2)加热:加热温度:1110-1170℃,保温时间220-280min;
(3)轧制阶段:轧制阶段分两阶段轧制,第一阶段在奥氏体完全再结晶区大压下率进行连续轧制,道次压下率≥8%,第一阶段终轧温度≥975℃;第二阶段采用控制轧制,即在奥氏体未再结晶区轧制,控轧开轧温度控制在870℃~920℃,终轧温度820℃~880℃,每道次压下率≥8%;
(4)冷却阶段:钢板轧制结束后,立即送入加速冷却设备,钢板开冷温度在770-830之间,冷区速率23-30℃/S,终冷温度420-500℃
(5)缓冷工序:钢板冷却完成后,立即完成热矫直下线堆缓冷,堆缓冷温度≥300℃,堆缓冷时间≥24h。
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