CN115074510A - 一种低碳低合金钢的热处理方法 - Google Patents
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 11
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- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
一种低碳低合金钢的热处理方法，钢的合金成分及百分比为C=0.07%~0.10%，Si=0.15%~0.45%，Mn=1.60%~2.00%，P≤0.018%，S≤0.020%，Al=0.02%~0.05%，Nb=0.030%~0.060%，Ti=0.008%~0.25%，Cu=0.10%~0.25%，Ni=0.50%~0.85%，Mo=0.10%~0.30%，其余为Fe和不可避免的杂质。关键工艺步骤：连铸轧制后的100mm厚板钢先进行720~780℃回火，将钢板随炉升温至所需温度后保温100~200min，然后空冷或水冷至室温；将热处理后的钢板再次随炉升温至620~680℃保温15~200min，空冷至室温，得到心部奥氏体成分超过6%，其中偏析区残余奥氏体占比8.5%，非偏析去残余奥氏体占比5%，残余奥氏体弥散分布于晶界处，尺寸在纳米级的低碳低合金钢。
Description
技术领域
本发明属于冶金技术领域，是一种改善具有中心偏析的低碳低合金钢性能的热处理方法。
背景技术
高强度海洋工程用钢向着大厚度、优异的低温韧性方向发展。钢板厚度的增加必然要求连铸坯厚度增厚。然而，厚板连铸坯不可避免低会产生中心偏析缺陷，且中心偏析缺陷随着铸坯厚度增加而变得更为严重。具有严重中心偏析的铸坯经加热和轧制后，往往在钢板中形成严重的带状组织，这种带状组织严重破坏钢板的韧塑性。交货的大厚度钢板在生产方面难度极大，尤其是100mm以上的厚板，偏析问题非常严重，往往生产的是不达标的废板，造成极大的浪费，这个时候如果有别的方法来进行改善拯救，那将是一个很重要的生产厚板止裂钢的辅助方法。
发明内容
本发明的目的在于提供一种改善具有中心偏析的低碳低合金钢性能的热处理方法，改善现有存在2.0级及以上严重偏析的FH500海洋工程用钢钢板性能的技术问题。
本发明的技术方案：
一种低碳低合金钢的热处理方法，钢的合金成分及百分比为C=0.07%~0.10%，Si=0.15%~0.45%，Mn=1.60%~2.00%，P≤0.018%，S≤0.020%，Al=0.02%~0.05%，Nb=0.030%~0.060%，Ti=0.008%~0.25%，Cu=0.10%~0.25%，Ni=0.50%~0.85%，Mo=0.10%~0.30%，其余为Fe和不可避免的杂质；关键工艺步骤：
（1）连铸轧制后的100mm厚板钢先进行720~780℃回火，将钢板随炉升温至所需温度后保温100~200min，然后空冷或水冷至室温；
（2）将热处理后的钢板再次随炉升温至620~680℃保温15~200min，空冷至室温。
经上述两步热处理后心部奥氏体成分超过6%，其中偏析区残余奥氏体占比8.5%，非偏析去残余奥氏体占比5%，残余奥氏体弥散分布于晶界处，尺寸在纳米级的低碳低合金钢。
本发明的有益效果：通过正火工艺使得厚板中的促奥氏体稳定元素进一步富集于更小的区域，然后再临界回火，空冷至室温得到大量稳定细小的残余奥氏体组织，板材心部的偏析带变得细小弥散，奥氏体增加，从而强度略微下降，塑韧性大大增加，达到改善具有严重中心偏析厚板力学性能的目的。尤其是改善存在2.0级及以上严重偏析的FH500海洋工程用钢钢板性能的热处理方法，所述钢板力学性能满足：常温屈服强度大于500MPa，常温抗拉强度大于650MPa，均匀延伸率大于20%，总延伸率大于35%。，-60℃横向心部冲击功大于200J。
附图说明
图1为轧态钢板经过热酸洗后的低倍图。
图2为本发明轧态（a）与实施例1（b）经过硝酸酒精侵蚀后光学显微镜观察的心部100x金相图。
图3为本发明实施例1钢的心部SEM图。
图4为本发明实施例1钢的心部EBSD图。
具体实施方式
以下通过一组实施例对本发明作进一步的说明。
一种低碳低合金钢的热处理方法，关键工艺步骤：
（1）连铸轧制后的100mm厚板钢先进行720~780℃回火，将钢板随炉升温至所需温度后保温100~200min，然后空冷或水冷至室温；
（2）将热处理后的钢板再次随炉升温至620~680℃保温15~200min，空冷至室温。
表1为本发明各实施例的化学成分重量百分比；表2为本发明各实施例的热处理工艺参数；表3为本发明各实施例及对比例的力学性能检测结果。
表1 各实施例化学成分重量百分比含量（%）
表2 各实施例的热处理工艺参数
表3 各实施例及对比例的力学性能检测结果
通过表3数据可以看出:
1)本发明的实施例钢材产品的屈服强度、屈强比、延伸率、冲击韧性都达到海工钢FH500的要求，而对比例1和对比例2均是延伸率和低温冲击韧性不达标，说明实施例已经将海工钢FH500钢板2.0级偏析问题通过热处理大大改善。
2)通过图1可以看出，轧态厚钢板偏析现象极其明显，心部偏析达到2.0级以上，韧性肯定不好；通过图2轧态于实施例心部金相对比可得，本发明热处理后的板材心部偏析带得到大大改善，热处理后实施例1心部偏析带更加细小，分布相对更加均匀；通过图3SEM观察实施例1，本发明热处理后的板材心部偏析不明显，组织看不到马/贝氏体，基本上为粒状贝氏体，针状铁素体；通过图4 EBSD图可知，本发明热处理后实施例1板材心部有大量细小弥散残余奥氏体保留至室温，因此具有严重中心偏析的FH500板材性能得到改善。
Claims (1)
1.一种低碳低合金钢的热处理方法，其特征在于：钢的合金成分及百分比为C=0.07%~0.10%，Si=0.15%~0.45%，Mn=1.60%~2.00%，P≤0.018%，S≤0.020%，Al=0.02%~0.05%，Nb=0.030%~0.060%，Ti=0.008%~0.25%，Cu=0.10%~0.25%，Ni=0.50%~0.85%，Mo=0.10%~0.30%，其余为Fe和不可避免的杂质；关键工艺步骤：
（1）连铸轧制后的100mm厚板钢先进行720~780℃回火，将钢板随炉升温至所需温度后保温100~200min，然后空冷或水冷至室温；
（2）将热处理后的钢板再次随炉升温至620~680℃保温15~200min，空冷至室温，得到心部奥氏体成分超过6%，其中偏析区残余奥氏体占比8.5%，非偏析去残余奥氏体占比5%，残余奥氏体弥散分布于晶界处，尺寸在纳米级的低碳低合金钢。
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| CN101177760A (zh) * | 2007-11-27 | 2008-05-14 | 湖南华菱湘潭钢铁有限公司 | 一种高强度船用钢板及其生产方法 |
| CN103014283A (zh) * | 2012-12-26 | 2013-04-03 | 首钢总公司 | 一种连铸坯生产水电站用特厚钢板的制造方法 |
| CN114592109A (zh) * | 2020-03-13 | 2022-06-07 | 钢铁研究总院 | 一种高强钢及其热处理工艺和应用 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101177760A (zh) * | 2007-11-27 | 2008-05-14 | 湖南华菱湘潭钢铁有限公司 | 一种高强度船用钢板及其生产方法 |
| CN103014283A (zh) * | 2012-12-26 | 2013-04-03 | 首钢总公司 | 一种连铸坯生产水电站用特厚钢板的制造方法 |
| CN114592109A (zh) * | 2020-03-13 | 2022-06-07 | 钢铁研究总院 | 一种高强钢及其热处理工艺和应用 |
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