CN112899443A - 4-8mm薄规格高韧性结构钢中厚钢板的制造工艺 - Google Patents

4-8mm薄规格高韧性结构钢中厚钢板的制造工艺 Download PDF

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CN112899443A
CN112899443A CN202110051654.7A CN202110051654A CN112899443A CN 112899443 A CN112899443 A CN 112899443A CN 202110051654 A CN202110051654 A CN 202110051654A CN 112899443 A CN112899443 A CN 112899443A
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steel plate
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刘熙章
成小龙
史成斌
孙京波
王国强
胡淑娥
李东岳
杨西亚
谢京全
金璐
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SD Steel Rizhao Co Ltd
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Abstract

本发明公开了一种4～8mm薄规格高韧性结构钢中厚钢板的制造工艺，本发明采用中低碳铌微合金钢成分设计，成分可适量添加或者不添加Cr、Cu、Ni、V元素，在炉卷轧机轧制成4‑8mm薄钢板，后续可进行回火处理,4‑8mm薄钢板的屈服强度ReH≥355MPa，屈服强度ReH≥470MPa，伸长率≥22％，‑40℃纵向KV2≥120J。本发明可确保4～8mm高韧性薄钢板成功生产。

Description

4-8mm薄规格高韧性结构钢中厚钢板的制造工艺
技术领域
本发明属于钢板加工技术领域，具体涉及一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺。
背景技术
薄钢板通常采用四辊轧机材以薄连铸坯直接轧制或以厚板为坯料再轧成，但是对于4-8mm的薄规格中厚钢板，由于钢板厚度薄，精轧轧制期间钢板冷却速度快，难以保证多道次及终轧温度在适宜的精轧温度范围内，为保证轧成顺利，通常采用高温快轧，热轧后的薄规格钢板无法保证零下40℃120J的高韧性指标要求；还有的薄板生产以添加镍的低合金特殊成分设计的铸坯，采用高温轧制法轧制出符合板形要求的薄板，钢板冷却后进行正火以求其低温韧性满足零下40℃120J的要求，但是强度和韧性并不能完全兼顾。
发明内容
本发明的目的在于提供一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺，细化了钢板最终组织，后续可配合采用回火处理，确保了薄钢板的轧制成功保证了薄钢板具有高的-40℃120J纵向冲击韧性。
本发明解决其技术问题所采用的技术方案是：一种4～8mm薄规格高韧性结构钢中厚钢板的制造工艺，包括以下步骤：
1)原料坯准备：用于制造高韧性结构钢薄钢板的铸坯的成分：碳含量C:0.09～0.16％，锰含量Mn≤1.60％，硅含量Si≤0.55％，磷含量P≤0.015％，硫含量S≤0.005％，Nb≤0.050％，氮含量≤50ppm，氢≤1.5ppm，其它元素Cr、Cu、Ni、V可适量添加或不添加；
2)坯料加热及轧制：坯料在加热炉进行加热，加热温度1120～1180℃，加热时间按照8～13min/cm控制，达到加热时间出炉轧制至中间厚度卷取，中间厚度根据轧后毛板长度控制在12～30mm，卷取炉加热温度控制在900～980℃，每次保温时间20～72min，保温结束后开卷继续后续轧制，轧制采用多道次大压下量轧制，至钢板温度降到850℃以下后再进入卷取炉加热，如此往复直至轧成成品厚度平板；
3)钢板矫直后平板在冷床冷却至室温后切割成定尺长度；
4)根据需要冷却后的钢板进入热处理炉可进行回火处理，回火温度500-650℃，保温时间30分钟～3小时；
5)钢板性能：4-8mm薄钢板的屈服强度ReH≥355MPa，屈服强度ReH≥470MPa，伸长率≥22％，-40℃纵向冲击韧性KV2≥120J(10*10*55mm全尺寸试样，以下同)。
进一步，所述步骤1)原料坯准备：用于制造高韧性结构钢薄钢板的铸坯的成分：碳含量C:0.09-0.16％，锰含量Mn≤1.60％,硅含量Si≤0.55％；磷含量P≤0.015％，硫含量S≤0.005％，Nb≤0.050％,氮含量≤50ppm，氢≤1.5ppm，其它元素Cr、Cu、Ni可适量添加或不添加。
进一步，所述步骤2)中坯料加热及轧制：坯料在加热炉进行加热，加热温度1120～1180℃，加热时间按照8～13min/cm控制，达到加热时间出炉轧制至中间厚度卷取，卷取厚度根据轧后毛板长度控制在12～28mm，卷取炉加热温度控制在900～980℃，每次保温时间20～72min，保温结束后开卷继续轧制，轧制采用多道次大压下量轧制，至钢板温度降到850℃以下后再进入卷取炉加热，如此往复直至轧成成品厚度。
进一步，所述步骤4)中冷却后的钢板可进入热处理炉进行回火处理，回火温度500-650℃，保温时间30分钟～3小时。
进一步，所述5)中钢板性能：4～8mm薄钢板的屈服强度ReH≥355MPa，屈服强度ReH≥470MPa，伸长率≥22％，-40℃纵向冲击韧性KV2≥120J。
本发明具有以下有益效果：本发明的一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺，通过炉卷轧机生产4～8mm结构钢薄钢板，由于轧制过程中卷取加热保温保证了精轧轧制过程道次累积压下量和精轧终轧温度处于合适的范围内，细化了钢板最终组织以及后续可配合采用回火处理，确保了薄钢板的轧制成功保证了薄钢板具有高的-40℃120J纵向冲击韧性。
具体实施方式
以下是本发明的具体实施例，对本发明的技术方案做进一步描述，但是本发明的保护范围并不限于这些实施例。凡是不背离本发明构思的改变或等同替代均包括在本发明的保护范围之内。
一种4～8mm薄规格高韧性结构钢中厚钢板的制造工艺，包括以下步骤：
1)原料坯准备：用于制造高韧性结构钢薄钢板的铸坯的成分：碳含量C:0.09～0.16％，锰含量Mn≤1.60％,硅含量Si≤0.55％；磷含量P≤0.015％，硫含量S≤0.005％，Nb≤0.050％,氮含量≤50ppm，氢≤1.5ppm，其它元素Cr、Cu、Ni、V可适量添加或不添加；
2)坯料加热及轧制：坯料在加热炉进行加热，加热温度1120～1180℃，加热时间按照8～13min/cm控制，达到加热时间出炉轧制至中间厚度卷取，中间厚度根据轧后毛板长度控制在12～30mm，卷取炉加热温度控制在900～980℃，每次保温时间20～72min，保温结束后开卷继续后续轧制，轧制采用多道次大压下量轧制，至钢板温度降到850℃以下后再进入卷取炉加热，如此往复直至轧成成品厚度平板；
3)钢板矫直后平板在冷床冷却至室温后切割成定尺长度；
4)根据需要冷却后的钢板可进入热处理炉进行回火处理，回火温度500-650℃，保温时间30分钟～3小时；
5)钢板性能：4-8mm薄钢板的屈服强度ReH≥355MPa，屈服强度ReH≥470MPa，伸长率≥22％，-40℃纵向冲击韧性KV2≥120J。

Claims (5)

1.一种4～8mm薄规格高韧性结构钢中厚钢板的制造工艺，其特征在于，包括以下步骤：
1)原料坯准备：用于制造高韧性结构钢薄钢板的铸坯的成分：碳含量C:0.09～0.16％，锰含量Mn≤1.60％，硅含量Si≤0.55％，磷含量P≤0.015％，硫含量S≤0.005％，Nb≤0.050％，氮含量≤50ppm，氢≤1.5ppm，其它元素Cr、Cu、Ni、V可适量添加或不添加；
2)坯料加热及轧制：坯料在加热炉进行加热，加热温度1120～1180℃，加热时间按照8～13min/cm控制，达到加热时间出炉轧制至中间厚度卷取，中间厚度根据轧后毛板长度控制在12～30mm，卷取炉加热温度控制在900～980℃，每次保温时间20～72min，保温结束后开卷继续后续轧制，轧制采用多道次大压下量轧制，至钢板温度降到850℃以下后再进入卷取炉加热，如此往复直至轧成成品厚度平板；
3)钢板矫直后平板在冷床冷却至室温后切割成定尺长度；
4)根据需要冷却后的钢板进入热处理炉可进行回火处理，回火温度500-650℃，保温时间30分钟～3小时；
5)钢板性能：4-8mm薄钢板的屈服强度ReH≥355MPa，屈服强度ReH≥470MPa，伸长率≥22％，-40℃纵向冲击韧性KV2≥120J。
2.如权利要求1所述的一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺，其特征在于，所述步骤1)原料坯准备：用于制造高韧性结构钢薄钢板的铸坯的成分：碳含量C:0.09-0.16％，锰含量Mn≤1.60％,硅含量Si≤0.55％；磷含量P≤0.015％，硫含量S≤0.005％，Nb≤0.050％,氮含量≤50ppm，氢≤1.5ppm，其它元素Cr、Cu、Ni可适量添加或不添加。
3.如权利要求1所述的一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺，其特征在于，所述步骤2)中坯料加热及轧制：坯料在加热炉进行加热，加热温度1120～1180℃，加热时间按照8～13min/cm控制，达到加热时间出炉轧制至中间厚度卷取，卷取厚度根据轧后毛板长度控制在12～28mm，卷取炉加热温度控制在900～980℃，每次保温时间20～72min，保温结束后开卷继续轧制，轧制采用多道次大压下量轧制，至钢板温度降到850℃以下后再进入卷取炉加热，如此往复直至轧成成品厚度。
4.如权利要求1所述的一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺，其特征在于，所述步骤4)中冷却后的钢板可进入热处理炉进行回火处理，回火温度500-650℃，保温时间30分钟～3小时。
5.如权利要求1所述的一种4-8mm薄规格高韧性结构钢中厚钢板的制造工艺，其特征在于，所述5)中钢板性能：4～8mm薄钢板的屈服强度ReH≥355MPa，屈服强度ReH≥470MPa，伸长率≥22％，-40℃纵向冲击韧性KV2≥120J。
CN202110051654.7A 2021-01-14 2021-01-14 4-8mm薄规格高韧性结构钢中厚钢板的制造工艺 Pending CN112899443A (zh)

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CN114029701A (zh) * 2021-10-28 2022-02-11 山东钢铁集团日照有限公司 一种薄规格高韧性钢板及其制造工艺

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CN104328356A (zh) * 2014-09-29 2015-02-04 南京钢铁股份有限公司 一种炉卷轧机生产薄规格高强结构钢板的制造方法
EP3561111A1 (en) * 2016-12-22 2019-10-30 Posco Thick steel sheet having excellent cryogenic impact toughness and manufacturing method therefor

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EP3561111A1 (en) * 2016-12-22 2019-10-30 Posco Thick steel sheet having excellent cryogenic impact toughness and manufacturing method therefor

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* Cited by examiner, † Cited by third party
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