CN117107158A - 一种大厚度785MPa级高强高韧性钢板及其生产方法 - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000005496 tempering Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000004512 die casting Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 2
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000006104 solid solution Substances 0.000 abstract description 2
- 230000018109 developmental process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007123 defense Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
本发明公开了一种大厚度785MPa级高强高韧性钢板及其生产方法，钢的合金成分百分比为C=0.07%~0.11%，Si=0.20%～0.30%，Mn=0.48%～0.53%，P≤0.008，S≤0.003，Al=0.03%~0.05%，V=0.03%~0.06%，Ni=4.50%~4.70%，Mo=0.30%~0.50%，Cr=0.40%~0.60%，其余为Fe和不可避免的杂质；钢板屈服强度785MPa~925MPa，延伸率≥15%，断面收缩率≥50%，‑20℃冲击功>100J，‑84℃冲击功>50J，含量N≤60ppm、O≤17ppm，钢的临界点温度为Ac1=720℃，Ac3=778℃。本发明采用NiCrMoV合金系进行合金设计，保证了钢的良好低温韧性和易焊接性；通采用高精度轧制技术及轧后直接时效或固溶+时效热处理等工艺提高了钢的强韧性匹配。
Description
技术领域
本发明涉及钢铁生产技术领域，特别是涉及一种高镍QT工艺的大厚度785MPa级高强度、高韧性、可焊接钢板及其生产方法。
背景技术
随着经济建设和国防工业的发明，特别是海军装备建设逐步从近海防御到远海防卫转型，大量的舰船需要建造；对船体用钢的的要求越来越多越来越高。随着船体规模的扩大，吨位的提升，减轻船体结构重量、降低重心，从而提升机动性是大型船舶建造的主要发展趋势，因此应采用更高强度级别材料来实现船体结构的轻量化。目前我国船体结构用钢主要采用390MPa～590MPa级钢，但面对未来发展更大的船舶，现有结构钢的强度级别较低，起不到减重、降低重心的作用。相近强度级别高强钢多采用高碳、高碳当量合金化设计，并结合TMCP工艺以达到高强度的要求，但普遍存在焊接性、热稳定性、耐蚀性差等问题，也无法满足超低温-80℃韧性的要求。因此，急需开发785MPa级船体结构用钢以满足装备发展要求。
发明内容
本为了解决以上问题，本发明的目的在于提供一种QT工艺的大厚度785MPa级高强度、高韧性、可焊接钢板及其生产方法，以满足装备发展要求。
发明的技术方案：
一种大厚度785MPa级高强高韧性钢板，钢的合金成分百分比为C＝0.07％～0.11％，Si＝0.20％～0.30％，Mn＝0.48％～0.53％，P≤0.008，S≤0.003，Al＝0.03％～0.05％，V＝0.03％～0.06％，Ni＝4.50％～4.70％，Mo＝0.30％～0.50％，Cr＝0.40％～0.60％，其余为Fe和不可避免的杂质；钢板屈服强度785MPa～925MPa，延伸率≥15％，断面收缩率≥50％，-20℃冲击功>100J，-84℃冲击功>50J，含量N≤60ppm、O≤17ppm，钢的临界点温度为Ac1＝720℃，Ac3＝778℃。
优化的，钢的化学成分质量百分比为C＝0.08％～0.10％，Si＝0.22％～0.28％，Mn＝0.50％～0.53％，P≤0.008，S≤0.003，Al＝0.03％～0.05％，V＝0.04％～0.05％，Ni＝4.55％～4.68％，Mo＝0.36％～0.47％，Cr＝0.48％～0.59％，其余为Fe和不可避免的杂质；
生产如上述大厚度785MPa级高强高韧性钢板的方法，生产流程包括冶炼、模铸、加热、轧制、调质热处理，关键工艺步骤包括：
1)轧制：采用两阶段轧制工艺，粗轧阶段开轧温度为1050±50℃，精轧终轧温度为980±20℃，轧后水冷；
2)调质：采用淬火和中、高温回火方式，利用辐射管式无氧化加热炉对钢板进行回火处理，淬火温度在860～880℃，保温时间系数3.5min/mm；回火温度为640～680℃，升温速率为3min/mm，回火保温时间系数3.0min/mm；回火后快冷，冷却速度为10～14℃/s，得到785MPa级高强钢板，
采用上述发明所产生的有益效果在于：本发明采用NiCrMoV合金系进行合金设计，保证了钢的良好低温韧性和易焊接性；通采用高精度轧制技术及轧后直接时效或固溶+时效热处理等工艺提高了钢的强韧性匹配。
附图说明
图1为实施例1的80mm厚785MPa级钢板调质钢板厚1/2位置微观组织形貌。
图2为实施例2的100mm厚785MPa级钢板调质钢板厚表面位置微观组织形貌。
图3为实施例2的100mm厚785MPa级钢板调质钢板厚1/4位置微观组织形貌。
图4为实施例2的100mm厚785MPa级钢板调质钢板厚1/2位置微观组织形貌。
具体实施方式
下面结合附图和具体实施例对本发明进行进一步详细说明。
实施例1
生产785MPa级高强韧易焊接钢板，厚度为80mm，其化学成分及碳当量百分比见表1。
生产流程包括冶炼、模铸、加热、轧制、调质热处理，关键工艺步骤包括：
(1)轧制工序：采用两阶段轧制，粗轧开轧温度为1050℃，精轧开轧温度为940℃，轧后水冷；
(2)调质工序：淬火温度为880℃，保温时间系数为2.8min/mm，水冷；回火温度为640℃，保温时间系数为3.0min/mm，回火结束后空冷。
本实施例785MPa级高强韧易焊接钢板1/2位置处的显微组织见图1，由图1可知组织为回火索氏体+贝氏体回火组织，各项力学性能指标见表2。
实施例2
生产785MPa级高强韧易焊接钢板，厚度为100mm，其化学成分及碳当量百分比见表1。
生产工序包括冶炼、模铸、加热、轧制及调质热处理，关键工艺步骤包括：
(1)轧制工序：采用两阶段轧制，粗轧开轧温度为1040℃，精轧开轧温度为900℃，轧后水冷；
(2)调质工序：淬火温度为880℃，保温时间系数为2.8min/mm，水冷；回火温度为640℃，保温时间系数为3.0min/mm，回火结束后空冷。
本实施例785MPa级高强韧易焊接钢板表面、1/4、1/2位置处的显微组织见图2、图3、图4，由图可知组织为回火索氏体+贝氏体回火组织。各项力学性能指标见表2。
表1实施例785MPa级高强韧易焊接钢板化学成分及百分比(％)
表2热处理后钢板的力学性能
Claims (3)
1.一种大厚度785MPa级高强高韧性钢板，其特征在于：钢的合金成分百分比为C=0.07%~0.11%，Si= 0.20%～0.30%，Mn=0.48%～0.53%，P≤0.008，S≤0.003，Al=0.03%~0.05%， V=0.03%~0.06%， Ni=4.50%~4.70%，Mo= 0.30%~0.50%，Cr= 0.40%~0.60%，其余为Fe和不可避免的杂质；钢板屈服强度785MPa~925MPa，延伸率≥15%，断面收缩率≥50%， -20℃冲击功>100J，-84℃冲击功>50J，含量N≤60ppm、O≤17ppm，钢的临界点温度为 Ac1=720℃，Ac3=778℃。
2.根据权利要求1所述的一种大厚度785MPa级高强高韧性钢板，其特征在于：钢的化学成分质量百分比为C=0.08%~0.10%，Si= 0.22%～0.28%，Mn=0.50%～0.53%，P≤0.008，S≤0.003，Al=0.03%~0.05%， V=0.04%~0.05%， Ni=4.55%~4.68%，Mo= 0.36%~0.47%，Cr= 0.48%~0.59%，其余为Fe和不可避免的杂质。
3.生产如权利要求1或2 的高镍大厚度785MPa级高强钢板的方法，生产流程包括冶炼、模铸、加热、轧制、调质热处理，其特征在于关键工艺步骤包括：
1）轧制：采用两阶段轧制工艺，粗轧阶段开轧温度为1050±50℃，精轧终轧温度为980±20℃，轧后水冷；
2) 调质：采用淬火和中、高温回火方式，利用辐射管式无氧化加热炉对钢板进行回火处理，淬火温度在860~880℃，保温时间系数3.5min/mm；回火温度为640~680℃，升温速率为3min/mm，回火保温时间系数3.0min/mm；回火后快冷，冷却速度为10~14℃/s，得到785MPa级高强钢板。
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| CN113355583A (zh) * | 2021-06-07 | 2021-09-07 | 东北大学 | 一种具有高强高韧性能的海洋工程用钢的制造方法 |
| CN114686649A (zh) * | 2022-03-31 | 2022-07-01 | 鞍钢股份有限公司 | 一种5%Ni低温钢及其制造方法 |
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