CN117403143A - 超大厚度压力容器用碳锰硅钢板及其生产方法 - Google Patents
超大厚度压力容器用碳锰硅钢板及其生产方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 22
- XTZVWOPRWVJODK-UHFFFAOYSA-N [Si].[Mn].[C] Chemical compound [Si].[Mn].[C] XTZVWOPRWVJODK-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910001199 N alloy Inorganic materials 0.000 claims description 3
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- 239000011572 manganese Substances 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
本发明公开了一种超大厚度压力容器用碳锰硅钢板及其生产方法，所述钢板化学成分组成及质量百分含量为：C≤0.12%，C+Mn/6+Cr/5：0.42～0.43%，Si：0.40～0.50%，Ni：0.60～0.65%，Ti≤0.002%，Nb≤0.002%，V：0.060～0.070%，N：0.0070‑0.0080%，Alt≥0.020%，其余为Fe和不可避免的杂质；所述钢板的生产方法包括冶炼、轧制及热处理工序。本发明提供的钢板厚度为250～300mm，综合性能优异，完全满足现代大型化压力容器制造的要求，质量稳定，适合大批量生产。
Description
技术领域
本发明属于冶金技术领域，具体涉及一种超大厚度压力容器用碳锰硅钢板及其生产方法。
背景技术
压力容器用碳锰硅钢板由于其生产成本低、综合性能优异，广泛应用于油气罐、低温球罐、核反应堆压力壳、换热器、中高温锅炉汽包等关键设备的制造。但近些年来，随着设备的大型化以及压力容器越来越高的安全性要求，超大厚度、超高性能在压力容器类材料的设计当中日益普遍。
然而目前市场上厚度超过250mm的此类钢板生产业绩非常少，且普遍存在性能不理想，生产成本较高的问题，无法满足日益增长的市场需求。本发明通过对钢板成分以及冶炼、轧制、热处理工艺进行创新，同时采用钢锭成材，在兼顾成本控制、钢板厚度、强度和低温韧性的前提下，提供了一种超大厚度压力容器用碳锰硅钢板及其生产方法。
发明内容
本发明的目的在于提供一种超大厚度压力容器用碳锰硅钢板及其生产方法，所提供钢板厚度为250～300mm，钢板性能符合压力容器用超大厚度钢板技术要求。
为实现上述目的，本发明提供的技术方案如下：
一种超大厚度压力容器用碳锰硅钢板，其化学成分组成及质量百分含量为：C≤0.12％，C+Mn/6+Cr/5：0.42～0.43％，Si：0.40～0.50％，Ni：0.60～0.65％，Ti≤0.002％，Nb≤0.002％，V：0.060～0.070％，N：0.0070-0.0080％，Alt≥0.020％，其余为Fe和不可避免的杂质。
本发明所述钢板厚度为250～300mm。
本发明所述超大厚度压力容器用碳锰硅钢板的生产方法包括冶炼、轧制及热处理工序。
本发明所述冶炼工序：采用铁水预脱硫+电炉初炼+LF精炼+VD真空脱气的超纯净钢冶炼工艺，其中LF过程采用铝线深脱氧，VD毕调入钒氮合金；采用扁钢锭浇铸，钢锭厚度700-870mm；钢锭脱帽时间≥12h，脱锭时间≥14h。
本发明所述轧制工序，采用高温大压下工艺，道次压下量≥30mm，终轧温度≥920℃；轧后利用MULPIC水冷设备往返入水，浇至返红≤600℃。
本发明所述热处理工序，采用淬火+回火工艺；所述淬火采用车底式辊底炉，保温温度910-915℃，保温时间2.5-3min/mm，出炉入水槽加速冷却，水温≤20℃，返红温度至≤100℃。
采用上述技术方案所产生的有益效果在于：本发明提供的钢板符合压力容器用超大厚度钢板技术要求。
(1)创新低碳成分，设计Si+Ni+V合计体系。硅不仅是良好的脱氧剂，且LF时与铝配合，能显著提高铝的脱氧能力；其次硅具有较强的强化作用，能溶于铁素体和奥氏体中提高钢的硬度和强度。Ni能显著提高钢的基体韧性，是保证-46℃超低温韧性的关键元素。V也是优良的脱氧剂，最重要的V是有效的获得细晶马氏体的元素。因V与N有较强的结和力，含钒钢中增加一定量氮能提高V的第二相析出的驱动力，使固溶态的N全部析出，最大化的发挥V的细晶作用及沉淀强化作用。
(2)采用扁钢锭成材，保证一定的压缩比，同时，延长脱模时间提高钢锭内部质量。针对厚板心部传递困难的特性，两阶段控轧效果差，本申请采用大压下量一次性轧制，轧后快速冷却至贝氏体转变区域，亚结构多，为后续热处理形成更多的形核点。淬回采用车底式炉，保证加热充分，并及时入水，获得细化的马氏体组织。
(3)本发明方法所得钢板综合性能优异，常温拉伸ReH≥460MPa，Rm：590～690MPa；-46℃冲击功平均值≥200J；厚度方向拉伸，断面收缩率Z≥35％；具有良好的内部质量，超声波探伤满足ASTM A578/A578M等级C。适合批量化生产，产品市场竞争力强。
具体实施方式
下面结合具体实施例对本发明作进一步详细的说明。
实施例1-6
(1)各实施例超大厚度压力容器用碳锰硅钢板的化学成分组成及质量百分含量见表1。
表1各实施例的化学成分组成及质量百分含量
| 实施例 | 厚度 | C | C+Mn/6+Cr/5 | Si | Ni | Ti | V | Nb | N | Al |
| 1 | 260 | 0.09 | 0.42 | 0.41 | 0.60 | 0.001 | 0.064 | 0.002 | 0.0076 | 0.029 |
| 2 | 300 | 0.11 | 0.423 | 0.44 | 0.63 | 0.002 | 0.070 | 0.002 | 0.0074 | 0.031 |
| 3 | 275 | 0.10 | 0.43 | 0.47 | 0.65 | 0.0009 | 0.061 | 0.001 | 0.0079 | 0.020 |
| 4 | 250 | 0.12 | 0.425 | 0.50 | 0.61 | 0.002 | 0.067 | 0.0014 | 0.0070 | 0.045 |
| 5 | 290 | 0.105 | 0.421 | 0.43 | 0.64 | 0.001 | 0.060 | 0.001 | 0.0072 | 0.053 |
| 6 | 280 | 0.097 | 0.428 | 0.49 | 0.62 | 0.0005 | 0.065 | 0.001 | 0.0080 | 0.044 |
表1中，化学成分的余量为Fe和不可避免的杂质。
(2)各实施例超大厚度压力容器用碳锰硅钢板的生产方法包括冶炼、轧制及热处理工序，具体地：
冶炼工序：采用铁水预脱硫+电炉初炼+LF精炼+VD真空脱气的超纯净钢冶炼工艺，其中LF过程采用铝线深脱氧，VD毕调入钒氮合金；采用扁钢锭浇铸，钢锭厚度700-870mm；钢锭脱帽时间≥12h，脱锭时间≥14h。
轧制工序：采用高温大压下工艺，道次压下量≥30mm，终轧温度≥920℃；轧后利用MULPIC水冷设备往返入水，浇至返红≤600℃。
热处理工序：采用淬火+回火工艺；所述淬火采用车底式辊底炉，保温温度910-915℃，保温时间2.5-3min/mm，出炉入水槽加速冷却，水温≤20℃，返红温度至≤100℃。
各实施例中冶炼、轧制工序具体参数见表2，钢板热处理工序的具体参数见表3。
表2各实施例中冶炼、轧制工序的具体参数
表3各实施例中热处理工序的具体参数
(3)超大厚度压力容器用碳锰硅钢板产品标准参考ASME A537/A537M。各实施例所得钢板具有良好的内部质量，超声波探伤满足ASTM A578/A578M等级C,力学性能试验结果见表4。
表4各实施例所得钢板力学性能试验结果
由表4可以看出，本发明提供的大厚度钢板质量稳定，适合大批量生产。
Claims (10)
1.一种超大厚度压力容器用碳锰硅钢板，其特征在于，所述钢板化学成分组成及质量百分含量为：C≤0.12%，C+Mn/6+Cr/5：0.42～0.43%，Si：0.40～0.50%，Ni：0.60～0.65%，Ti≤0.002%，Nb≤0.002%，V：0.060～0.070%，N：0.0070-0.0080%，Alt≥0.020%，其余为Fe和不可避免的杂质。
2.根据权利要求1所述的超大厚度压力容器用碳锰硅钢板，其特征在于：所述钢板厚度为250～300mm。
3.根据权利要求1所述的超大厚度压力容器用碳锰硅钢板，其特征在于：所述钢板具有良好的内部质量，超声波探伤满足ASTM A578/A578M等级C。
4.根据权利要求1所述的超大厚度压力容器用碳锰硅钢板，其特征在于：所述钢板交货态力学性能满足：常温拉伸ReH≥460MPa，Rm：590～690MPa；-46℃冲击功≥200J。
5.根据权利要求1所述的超大厚度压力容器用碳锰硅钢板，其特征在于：所述钢板交货态力学性能满足：厚度方向拉伸，断面收缩率Z≥35%。
6.基于权利要求1-5任意一项所述超大厚度压力容器用碳锰硅钢板的生产方法，其特征在于，所述生产方法包括冶炼、轧制及热处理工序。
7.根据权利要求6所述的超大厚度压力容器用碳锰硅钢板的生产方法，其特征在于，所述冶炼工序：采用铁水预脱硫+电炉初炼+LF精炼+VD真空脱气的超纯净钢冶炼工艺，其中LF过程采用铝线深脱氧，VD毕调入钒氮合金。
8.根据权利要求6所述的超大厚度压力容器用碳锰硅钢板的生产方法，其特征在于，所述冶炼工序，采用扁钢锭浇铸，钢锭厚度700-870mm；钢锭脱帽时间≥12h，脱锭时间≥14h。
9.根据权利要求6所述的超大厚度压力容器用碳锰硅钢板的生产方法，其特征在于，所述轧制工序，采用高温大压下工艺，道次压下量≥30mm，终轧温度≥920℃；轧后钢板利用MULPIC水冷设备往返入水，浇至返红≤600℃。
10.根据权利要求6所述的超大厚度压力容器用碳锰硅钢板的生产方法，其特征在于，所述钢板热处理工序采用淬火+回火工艺；所述淬火采用车底式辊底炉，保温温度910-915℃，保温时间2.5-3min/mm，出炉入水槽加速冷却，水温≤20℃，返红温度至≤100℃。
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