CN114686760A - 一种7Ni用钢及其生产方法 - Google Patents
一种7Ni用钢及其生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 239000010959 steel Substances 0.000 title claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 13
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 238000007689 inspection Methods 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 10
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- 238000010079 rubber tapping Methods 0.000 claims description 8
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 7
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 6
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- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000011946 reduction process Methods 0.000 claims description 5
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- 230000008901 benefit Effects 0.000 abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
- 239000010955 niobium Substances 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 229910052758 niobium Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009869 magnesium metallurgy Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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Abstract
本发明公开了一种7Ni用钢及其生产方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.030%~0.060%,Si:0.05%~0.30%,Mn:0.70%~1.0%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.50%~7.50%,Cr≤0.05%,Mo:0.20%~0.30%,Cu≤0.05%,Al:0.020%~0.050%,Mg:0.0008%~0.0020%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。通过冶炼、轧制、热处理等一系类的工艺改进,解决了钢种晶间裂纹的工艺难题,获得了钢种批量冶炼制造的优势,制造稳定性得到了大幅度的提升,制造成本获得了大幅度的降低。
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7Ni用钢及其生产方法。
背景技术
随着我国钢铁冶金技术的不断发展,钢铁企业品牌竞争优势越来越明显。为了提高竞争力,企业不断开发品种用钢,镍系钢合金含量高,产品质量优异,但目前存在成本高,低端市场应用浪费的情况,其中7Ni用钢是镍含量7%的容器用钢,如何降低7Ni用钢制造成本,是企业取得良好的市场竞争优势的关键一步。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种7Ni用钢,其化学成分及质量百分比如下:C:0.030%~0.060%,Si:0.05%~0.30%,Mn:0.70%~1.0%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.50%~7.50%,Cr≤0.05%,Mo:0.20%~0.30%,Cu≤0.05%,Al:0.020%~0.050%,Mg:0.0008%~0.0020%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。
本发明进一步限定的技术方案是:
前所述的一种7Ni用钢,其化学成分及质量百分比如下:C:0.030%~0.050%,Si:0.05%~0.20%,Mn:0.70%~0.9%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.50%~7.30%,Cr≤0.05%,Mo:0.20%~0.25%,Cu≤0.050%,Al:0.020%~0.040%,Mg:0.0008%~0.0018%,N≤0.0050%,H≤0.0002%,余量为Fe和不可避免的杂质。
前所述的一种7Ni用钢,其化学成分及质量百分比如下:C:0.035%~0.055%,Si:0.15%~0.25%,Mn:0.80%~0.90%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.80%~7.20%,Cr≤0.05%,Mo:0.22%~0.28%,Cu≤0.050%,Al:0.025%~0.045%,Mg:0.0010%~0.0018%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。
前所述的一种7Ni用钢,其化学成分及质量百分比如下:C:0.040%~0.060%,Si:0.20%~0.30%,Mn:0.80%~1.0%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.80%~7.50%,Cr≤0.05%,Mo:0.25%~0.30%,Cu≤0.050%,Al:0.025%~0.050%,Mg:0.0010%~0.0020%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。
本发明的另一目的在于提供一种7Ni用钢生产方法,包括以下步骤:
S1、铁水脱硫后送至转炉冶炼,采用顶底复吹工艺冶炼,镍钼合金随废钢一起加入转炉,并且计入废钢重量,供氧80%进行倒渣,冶炼终点温度1580~1620℃,成分满足要求进行出钢操作;
S2、钢水送至精炼进行脱氧合金化及脱硫操作,成分温度符合后送至RH进行真空处理,真空度≤3.0mbar,真空保持时间20~25分钟,真空处理后煨入200~220米镁铝线;
S3、钢水精炼处理结束后送至连铸进行浇铸,浇铸速度0.6~1.3m/min,过热度25~35℃,采用电磁搅拌及动态轻压下工艺,铸坯出连铸后进行保温坑堆冷48小时后进行表检,铸坯表检合格后采用机械修磨,修磨后的铸坯采用高温抗氧化涂料进行喷涂;
S4、铸坯处理好送至加热炉进行加热,加热炉加热过程为:加热速度10~15℃/min加热至600℃,加热速度5~7℃/min加热至600~1000℃,加热速度2℃/min加热至1000~1100℃,1100℃保温20min后出加热炉;
S5、采用二阶段轧制工艺轧制,二开温度800~950℃,终轧800~900℃,返红温度400~600℃;
S6、淬火温度760~790℃,保温时间10~30分钟,淬火后进行回火处理,回火温度550~650℃,保温时间10~15分钟,空冷;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。
前所述的一种7Ni用钢生产方法,步骤S3中修磨深度1~2mm,喷涂厚度0.1~0.3mm。
本发明的有益效果是:
(1)本发明通过对钢种机理的深入研究,研究了影响钢种表面质量的因素,进行了相应的开发应用,通过冶炼、轧制、热处理等一系类的工艺改进,解决了钢种晶间裂纹的工艺难题,获得了钢种批量冶炼制造的优势,制造稳定性得到了大幅度的提升,制造成本获得了大幅度的降低,有效提升了产品的市场竞争力;
(2)本发明中采用镁冶金技术改善了夹杂物形态,提升了产品的洁净度,避免了夹杂物物在表面集聚导致晶间裂纹的发生;
(3)本发明中通过降低氮、氢气体含量及磷硫含量,提高钢的碳含量,减少了硫化锰夹杂及气体含量对钢表面质量的恶化,添加少量的铌,起到了固氮、固碳的作用,从而减少表面晶间裂纹的发生率;
(4)本发明中采用独特的抗氧化涂料进行喷涂,避免了加热过程中铸坯的二次氧化,减少了轧制过程中铸坯表面氧化铁皮的生成量,提升了轧制钢板的表面质量;
(5)本发明中高镍钢的相变温度570℃,结束温度是730℃,本发明通过不同的升温速率进行加热工艺质量,降低了线膨胀及导热系数,避免了加热过程的相变应力导致的晶间裂纹的发生;
(6)本发明中加热出钢温度过高会导致铸坯表面的高温氧化裂纹,这种裂纹随着奥氏体的粗大会越发明显,因此,低温出钢有效避免了铸坯表面高温晶间裂纹;
(7)本发明中采用低温热处理工艺,可有效避免轧制过程中的沿晶氧化裂纹趋势,避免因宽化导致奥氏体化过程中晶间裂纹的发生,有效降低调质钢板的批量裂纹发生率;
(8)本发明中镍钼合金按废钢形势加入转炉,不影响热量值,同时因为镍钼合金的加入,有效降低了钢水的凝固定,满足了低温出钢的要求,有利于去除碳磷元素,提升了冶炼速度。
附图说明
图1为实施例1的金相组织图。
具体实施方式
实施例1
本实施例提供的一种7Ni用钢,其化学成分及质量百分比如下:C:0.043%,Si:0.16%,Mn:0.79%,P:0.003%,S:0.0011%,Nb:0.0030%(残余),V:0.002%(残余),Ti:0.002%(残余),Ni:7.1%,Cr:0.02%,Mo:0.23%,Cu:0.030%,Al:0.029%,Mg:0.0017%,N:0.0036%,H:0.00017%,余量为Fe和不可避免的杂质。
制备方法包括以下步骤:
S1、铁水脱硫后送至转炉冶炼,采用顶底复吹工艺冶炼,镍钼合金随废钢一起加入转炉,并且计入废钢重量,供氧80%进行倒渣,冶炼终点温度1602℃,成分满足要求进行出钢操作;
S2、钢水送至精炼进行脱氧合金化及脱硫操作,成分温度符合后送至RH进行真空处理,真空度≤3.0mbar,真空保持时间21分钟,真空处理后煨入210米镁铝线;
S3、钢水精炼处理结束后送至连铸进行浇铸,浇铸速度0.9m/min,过热度27℃,采用电磁搅拌及动态轻压下工艺,铸坯出连铸后进行保温坑堆冷48小时后进行表检,铸坯表检合格后采用机械修磨,修磨深度1.6mm,修磨后的铸坯采用高温抗氧化涂料进行喷涂,喷涂厚度0.1mm;
S4、铸坯处理好送至加热炉进行加热,加热炉加热过程为:加热速度13℃/min加热至600℃,加热速度6℃/min加热至600~1000℃,加热速度2℃/min加热至1000~1100℃,1100℃保温20min后出加热炉;
S5、采用二阶段轧制工艺轧制,二开温度880℃,终轧850℃,返红温度460℃;
S6、淬火温度780℃,保温时间22分钟,淬火后进行回火处理,回火温度630℃,保温时间12分钟,空冷;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。
实施例2
本实施例提供的一种7Ni用钢,其化学成分及质量百分比如下:C:0.0430%,Si:0.09%,Mn:0.779%,P:0.002%,S:0.0012%,Nb:0.0020%(残余),V:0.002%(残余),Ti:0.003%(残余),Ni:6.96%,Cr:0.02%,Mo:0.21%,Cu:0.010%,Al:0.038%,Mg:0.0014%,N:0.0046%,H:0.00017%,余量为Fe和不可避免的杂质。
制备方法包括以下步骤:
S1、铁水脱硫后送至转炉冶炼,采用顶底复吹工艺冶炼,镍钼合金随废钢一起加入转炉,并且计入废钢重量,供氧80%进行倒渣,冶炼终点温度1586℃,成分满足要求进行出钢操作;
S2、钢水送至精炼进行脱氧合金化及脱硫操作,成分温度符合后送至RH进行真空处理,真空度≤3.0mbar,真空保持时间23分钟,真空处理后煨入220米镁铝线;
S3、钢水精炼处理结束后送至连铸进行浇铸,浇铸速度0.7m/min,过热度26℃,采用电磁搅拌及动态轻压下工艺,铸坯出连铸后进行保温坑堆冷48小时后进行表检,铸坯表检合格后采用机械修磨,修磨深度1.9mm,修磨后的铸坯采用高温抗氧化涂料进行喷涂,喷涂厚度0.13mm;
S4、铸坯处理好送至加热炉进行加热,加热炉加热过程为:加热速度14℃/min加热至600℃,加热速度5.7℃/min加热至600~1000℃,加热速度2℃/min加热至1000~1100℃,1100℃保温20min后出加热炉;
S5、采用二阶段轧制工艺轧制,二开温度910℃,终轧890℃,返红温度580℃;
S6、淬火温度780℃,保温时间16分钟,淬火后进行回火处理,回火温度590℃,保温时间13分钟,空冷;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。
实施例3
本实施例提供的一种7Ni用钢,其化学成分及质量百分比如下:C:0.056%,Si:0.260%,Mn:0.93%,P:0.002%,S:0.0013%,Nb:0.003%(残余),V:0.002%(残余),Ti:0.002%(残余),Ni:7.3%,Cr::0.02%,Mo:0.29%,Cu:0.020%,Al:0.041%,Mg:0.0016%,N:0.0036%,H:0.00011%,余量为Fe和不可避免的杂质。
制备方法包括以下步骤:
S1、铁水脱硫后送至转炉冶炼,采用顶底复吹工艺冶炼,镍钼合金随废钢一起加入转炉,并且计入废钢重量,供氧80%进行倒渣,冶炼终点温度1606℃,成分满足要求进行出钢操作;
S2、钢水送至精炼进行脱氧合金化及脱硫操作,成分温度符合后送至RH进行真空处理,真空度≤3.0mbar,真空保持时间24分钟,真空处理后煨入210米镁铝线;
S3、钢水精炼处理结束后送至连铸进行浇铸,浇铸速度0.7m/min,过热度27℃,采用电磁搅拌及动态轻压下工艺,铸坯出连铸后进行保温坑堆冷48小时后进行表检,铸坯表检合格后采用机械修磨,修磨深度1.2mm,修磨后的铸坯采用高温抗氧化涂料进行喷涂,喷涂厚度0.2mm;
S4、铸坯处理好送至加热炉进行加热,加热炉加热过程为:加热速度13℃/min加热至600℃,加热速度6℃/min加热至600~1000℃,加热速度2℃/min加热至1000~1100℃,1100℃保温20min后出加热炉;
S5、采用二阶段轧制工艺轧制,二开温度860℃,终轧830℃,返红温度420℃;
S6、淬火温度766℃,保温时间28分钟,淬火后进行回火处理,回火温度590℃,保温时间12分钟,空冷;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。
实施例1-3的各项力学性能如下表:
本发明操作简单,生产工艺得以稳定执行,效果显著,同时也适用于镍添加5.5%~9.5%的其它镍系品种,具有明显的经济效益和安全效益。
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7Ni用钢,其特征在于:其化学成分及质量百分比如下:C:0.030%~0.060%,Si:0.05%~0.30%,Mn:0.70%~1.0%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.50%~7.50%,Cr≤0.05%,Mo:0.20%~0.30%,Cu≤0.05%,Al:0.020%~0.050%,Mg:0.0008%~0.0020%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的一种7Ni用钢,其特征在于:其化学成分及质量百分比如下:C:0.030%~0.050%,Si:0.05%~0.20%,Mn:0.70%~0.9%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.50%~7.30%,Cr≤0.05%,Mo:0.20%~0.25%,Cu≤0.050%,Al:0.020%~0.040%,Mg:0.0008%~0.0018%,N≤0.0050%,H≤0.0002%,余量为Fe和不可避免的杂质。
3.根据权利要求1所述的一种7Ni用钢,其特征在于:其化学成分及质量百分比如下:C:0.035%~0.055%,Si:0.15%~0.25%,Mn:0.80%~0.90%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.80%~7.20%,Cr≤0.05%,Mo:0.22%~0.28%,Cu≤0.050%,Al:0.025%~0.045%,Mg:0.0010%~0.0018%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。
4.根据权利要求1所述的一种7Ni用钢,其特征在于:其化学成分及质量百分比如下:C:0.040%~0.060%,Si:0.20%~0.30%,Mn:0.80%~1.0%,P≤0.005%,S≤0.002%,残余Nb≤0.0050%,残余V≤0.003%,残余Ti≤0.005%,Ni:6.80%~7.50%,Cr≤0.05%,Mo:0.25%~0.30%,Cu≤0.050%,Al:0.025%~0.050%,Mg:0.0010%~0.0020%,N≤0.0060%,H≤0.0002%,余量为Fe和不可避免的杂质。
5.一种7Ni用钢生产方法,其特征在于:应用于权利要求1-4任意一项,包括以下步骤:
S1、铁水脱硫后送至转炉冶炼,采用顶底复吹工艺冶炼,镍钼合金随废钢一起加入转炉,并且计入废钢重量,供氧80%进行倒渣,冶炼终点温度1580~1620℃,成分满足要求进行出钢操作;
S2、钢水送至精炼进行脱氧合金化及脱硫操作,成分温度符合后送至RH进行真空处理,真空度≤3.0mbar,真空保持时间20~25分钟,真空处理后煨入200~220米镁铝线;
S3、钢水精炼处理结束后送至连铸进行浇铸,浇铸速度0.6~1.3m/min,过热度25~35℃,采用电磁搅拌及动态轻压下工艺,铸坯出连铸后进行保温坑堆冷48小时后进行表检,铸坯表检合格后采用机械修磨,修磨后的铸坯采用高温抗氧化涂料进行喷涂;
S4、铸坯处理好送至加热炉进行加热,加热炉加热过程为:加热速度10~15℃/min加热至600℃,加热速度5~7℃/min加热至600~1000℃,加热速度2℃/min加热至1000~1100℃,1100℃保温20min后出加热炉;
S5、采用二阶段轧制工艺轧制,二开温度800~950℃,终轧800~900℃,返红温度400~600℃;
S6、淬火温度760~790℃,保温时间10~30分钟,淬火后进行回火处理,回火温度550~650℃,保温时间10~15分钟,空冷;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。
6.根据权利要求5所述的一种7Ni用钢生产方法,其特征在于:所述步骤S3中修磨深度1~2mm,喷涂厚度0.1~0.3mm。
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