CN112251569A - 一种提高q460级高强度钢板屈服强度的方法 - Google Patents

一种提高q460级高强度钢板屈服强度的方法 Download PDF

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CN112251569A
CN112251569A CN202010951263.6A CN202010951263A CN112251569A CN 112251569 A CN112251569 A CN 112251569A CN 202010951263 A CN202010951263 A CN 202010951263A CN 112251569 A CN112251569 A CN 112251569A
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雷晓荣
闫强军
李平和
王新
靳建锋
黄彪凯
于刚
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Nanjing Iron and Steel Co Ltd
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Abstract

本发明公开了一种提高Q460级高强度钢板屈服强度的方法，涉及钢铁生产技术领域，化学成分中包括Nb、V、Ti微合金元素，Ceq＜0.48，适用于轧态屈服强度＜470MPa的钢板。可以对轧态屈服强度偏低的钢板进行挽救，降低了钢厂性能非计划的损失。所采用的方法生产工艺简单，工艺参数可调范围较宽，在钢厂易于实现。

Description

一种提高Q460级高强度钢板屈服强度的方法
技术领域
本发明涉及钢铁生产技术领域，特别是涉及一种提高Q460级高强度钢板屈服强度的方法。
背景技术
460MPa级高强钢原来主要采用调质(即淬火+回火)热处理交货，但是随着技术进步，调质工艺逐渐被TMCP工艺取代，即控制轧制+控制冷却工艺。随着中厚板装备水平大幅提高，采用TMCP工艺生产460MPa级高强钢已是主流趋势。
但由于460MPa级高强钢强度要求高，为保证强度，轧后冷却速率需足够高，返红温度偏低，轧态性能不够稳定,经常会出现屈服强度不满足要求的情况，若采用热处理方法，对TMCP处理后屈服偏低的钢板进行挽救，则可以有效提高Q460级高强钢的性能合格率，减少钢厂的非计划损失。而目前，现有技术鲜有提供Q460级高强钢屈服低的挽救方法。
发明内容
为了解决以上技术问题，本发明提供一种提高Q460级高强度钢板屈服强度的方法，化学成分中包括Nb、V、Ti微合金元素，Ceq＜0.48，适用于轧态屈服强度＜470MPa的钢板。
本发明进一步限定的技术方案是：
前所述的一种提高Q460级高强度钢板屈服强度的方法，Nb：0.030％-0.050％，V：0.040％-0.060％，Ti：0.010％-0.020％，Ceq＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15。
前所述的一种提高Q460级高强度钢板屈服强度的方法，采用两阶段控制，终轧温度为820±20℃，轧后采用水冷，冷却返红温度为610±20℃，轧态屈服强度为450-470MPa。
前所述的一种提高Q460级高强度钢板屈服强度的方法，在氮气保护氛围下，采用中高温回火方式，利用二级模型自动控制辊底式连续炉辐射管，对轧态屈服强度不满足要求的钢板进行回火处理。
前所述的一种提高Q460级高强度钢板屈服强度的方法，对回火温度、升温速率、保温时间、炉温均匀性进行控制，加热结束后放置冷床空冷。
前所述的一种提高Q460级高强度钢板屈服强度的方法，回火温度560-600℃，升温速率为2.2min/mm，回火保温时间20-30min。
本发明的有益效果是：本发明可以对轧态屈服强度偏低的钢板进行挽救，降低了钢厂性能非计划的损失。所采用的方法生产工艺简单，工艺参数可调范围较宽，在钢厂易于实现。
具体实施方式
以下实施例提供的一种提高Q460级高强度钢板屈服强度的方法，选取4张轧态屈服偏低的钢板作为实施例，具体的微合金元素含量及轧态力学性能如表1：
表1各实施例的化学成分及轧态性能
Figure BDA0002677028170000021
钢板号1、2、3、4均采用两阶段控制轧制，成品厚度均为30mm，中间坯厚度为60mm，精轧开轧温度分别为876℃、907℃、887℃、897℃，精轧终轧温度分别为812℃、821℃、826℃、822℃，轧制后在钢板头处保留足够的取样长度。
针对轧态屈服强度不满足470MPa的钢板，采用热处理的方式进行挽救，即在氮气保护氛围下，采用中高温回火方式，利用二级模型自动控制辊底式连续炉辐射管，进行回火处理，具体见如下实施例。
实施例1
钢板1的回火温度为560℃，升温速率为2.2min/mm，回火保温时间为30min，保温结束后，放置冷床空冷。
实施例2
钢板2的回火温度为580℃，升温速率为2.2min/mm，回火保温时间为25min，保温结束后，放置冷床空冷。
实施例3
钢板3的回火温度为590℃，升温速率为2.2min/mm，回火保温时间为22min，保温结束后，放置冷床空冷。
实施例4
钢板4的回火温度为600℃，升温速率为2.2min/mm，回火保温时间为20min，保温结束后，放置冷床空冷。
对各实施例钢板进行力学性能测试，强度按照GB/T228-2002金属材料室温拉伸试验方法进行，冲击按照金属夏比V型缺口冲击试验方法测定，性能检测结果见表2：
表2屈服偏低钢板回火后的力学性能
Figure BDA0002677028170000031
由表2可以看出，轧态屈服强度偏低的钢板经过回火处理后，屈服强度均大于460MPa，抗拉强度均在550-720MPa的范围之内，延伸率≥17％，0℃纵向冲击功为100J以上。与表1进行对比，回火后屈服强度、抗拉强度均比轧态提高30MPa以上，0℃冲击功变化不大。
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。

Claims (6)

1.一种提高Q460级高强度钢板屈服强度的方法，其特征在于：化学成分中包括Nb、V、Ti微合金元素，Ceq＜0.48，适用于轧态屈服强度＜470MPa的钢板。
2.根据权利要求1所述的一种提高Q460级高强度钢板屈服强度的方法，其特征在于：Nb：0.030%-0.050%，V：0.040%-0.060%，Ti：0.010%-0.020%，Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15。
3.根据权利要求1所述的一种提高Q460级高强度钢板屈服强度的方法，其特征在于：采用两阶段控制，终轧温度为820±20℃，轧后采用水冷，冷却返红温度为610±20℃，轧态屈服强度为450-470MPa。
4.根据权利要求1所述的一种提高Q460级高强度钢板屈服强度的方法，其特征在于：在氮气保护氛围下，采用中高温回火方式，利用二级模型自动控制辊底式连续炉辐射管，对轧态屈服强度不满足要求的钢板进行回火处理。
5.根据权利要求4所述的一种提高Q460级高强度钢板屈服强度的方法，其特征在于：对回火温度、升温速率、保温时间、炉温均匀性进行控制，加热结束后放置冷床空冷。
6.根据权利要求5所述的一种提高Q460级高强度钢板屈服强度的方法，其特征在于：回火温度560-600℃，升温速率为2.2min/mm，回火保温时间20-30min。
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