CN114951579A - 一种高碳马氏体不锈钢连铸的方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 23
- 238000005266 casting Methods 0.000 title claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 229910052786 argon Inorganic materials 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 7
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 claims description 5
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 5
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 238000005204 segregation Methods 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005098 hot rolling Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 238000009847 ladle furnace Methods 0.000 description 7
- 239000011651 chromium Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- B22D11/11—Treating the molten metal
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- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
本发明涉及一种提升高碳马氏体不锈钢连铸坯内部质量的工艺方法,主要内容有:①钢水经转炉、LF炉等工序冶炼结束后,吊运至连铸叉臂;②保证开浇前中间包吹氩至少5分钟,连铸全程做好保护浇注;③连铸生产时结晶器保护渣需采用高碳马氏体不锈钢专用渣,④浇注过程采用“二冷+末端”组合式电磁搅拌;⑤中间包钢水过热度控制在15℃‑30℃,拉速按0.9±0.1m/min控制;⑥连铸坯需采用“热装热送”工艺,下线连铸坯需立即用保温车送往热轧车间进行加热、轧制。本发明解决了高碳马氏体不锈钢连铸坯内部容易出现的中心疏松和中心偏析等问题,提升了高碳马氏体不锈钢连铸坯内部质量。
Description
技术领域
本发明涉及一种高碳马氏体不锈钢连铸的方法,属不锈钢连铸生产领域。
背景技术
高碳马氏体不锈钢是指钢中碳含量在0.2%以上的含铬马氏体不锈钢,典型牌号为Cr13型,如3Cr13、4Cr13、5Cr15MoV等。该类型不锈钢通常采用连铸工艺生产,连铸坯表面质量较好,但内部质量较差,容易出现中心疏松、中心偏析等缺陷,所制刀具容易出现行业俗称的“水波纹”缺陷,影响产品使用和美观效果。
发明内容
本发明的目的就是针对上述问题,提供一种高碳马氏体不锈钢连铸的方法。
本发明的目的是这样实现的:一种高碳马氏体不锈钢连铸的方法,包括以下步骤:1)预处理铁水经转炉、LF炉等工序冶炼成合格钢水后,用天车吊运至连铸叉臂;
2)连铸全程做好保护浇注,开浇前中间包吹氩5-15分钟,氩气流量按200-300L/min控制,确保开浇时中间包内充满氩气气氛;钢水浇注过程中确保长水口与钢包下水口连接处、中包上水口与浸入式水口连接处全部氩封,浇注过程中保证长水口全部埋入中间包内,确保中间包液面和结晶器液面平稳;
3)钢水浇注过程主要参数:中间包钢水采用低过热度浇注,过热度控制在15-30℃;拉速按0.9±0.1m/min控制;钢水在结晶器中采用强冷方式,冷却水流速控制在8-9m/s;进入二次冷却区后,二冷水比水量按0.8L/kg控制;浸入式水口插入深度按120±5mm控制;浇注过程使用高碳马氏体不锈钢专用保护渣,其主要化学成分以质量百分比计:氧化钙32.0%-38.0%,二氧化硅26.0%-30.0%,氧化镁1.0%-3.0%,氧化铝3.0%-5.0 %,氧化锂0.4%-1.2%,氧化钠11.0%-15.0%,炭黑3.5%-4.5%,萤石8.0%-12.0%,其余为杂质;
4)浇注过程采用“二冷+末端”组合式电磁搅拌,其中二冷区电磁搅拌为“箱式”,安装于扇形1段内弧侧,工艺参数为
电流500-600A,频率3-4Hz,换向10-15秒;凝固末端电磁搅拌为“辊式”,共两组,第一组安装于扇形3段进口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒;第二组安装于扇形3段出口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒;
5)连铸坯采用“热装热送”工艺,下线连铸坯及时送至连轧工序进行加热、轧制。
本发明的有益效果是:本发明解决了高碳马氏体不锈钢连铸坯内部容易出现的中心疏松和中心偏析等问题,提升了高碳马氏体不锈钢连铸坯内部质量。
具体实施方式
本发明结合高碳马氏体不锈钢连铸生产工艺特点及连铸坯特性。通过开发一种“二冷+末端”组合式电磁搅拌工艺,并辅以中间包低过热度浇注工艺,实现了高碳马氏体不锈钢内部质量明显提升,连铸坯低倍组织中心疏松和中心偏析均达到1级水平(曼内斯曼标准),从而获得了内部质量良好的高碳马氏体不锈钢连铸坯。
1)预处理铁水经转炉、LF炉等工序冶炼成合格钢水后,用天车吊运至连铸叉臂;
2)连铸全程做好保护浇注,开浇前中间包吹氩至少5-10分钟,氩气流量按200-300L/min控制,确保开浇时中间包包内充满氩气气氛;钢水浇注过程中确保长水口与钢包下水口连接处、中包上水口与浸入式水口连接处全部氩封,浇注过程中保证长水口全部埋入中间包内,确保中间包液面和结晶器液面平稳;
3)钢水浇注过程主要参数:中间包钢水采用低过热度浇注,过热度控制在15-30℃;拉速按0.9±0.1m/min控制;钢水在结晶器中采用强冷方式,冷却水流速控制在8-9m/s;进入二次冷却区后,二冷水比水量按0.8L/kg控制;浸入式水口插入深度按120±5mm控制;浇注过程使用高碳马氏体不锈钢专用保护渣,其主要化学成分以质量百分比计:氧化钙32.0%-38.0%,二氧化硅26.0%-30.0%,氧化镁1.0%-3.0%,氧化铝3.0%-5.0 %,氧化锂0.4%-1.2%,氧化钠11.0%-15.0%,炭黑3.5%-4.5%,萤石8.0%-12.0%,其余为杂质;
4)浇注过程采用“二冷+末端”组合式电磁搅拌,其中二冷区电磁搅拌为“箱式”,安装于扇形1段内弧侧,工艺参数为电流500-600A,频率3-4Hz,换向10-15秒;凝固末端电磁搅拌为“辊式”,共两组,第一组安装于扇形3段进口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒;第二组安装于扇形3段出口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒。
5)连铸坯采用“热装热送”工艺,下线连铸坯及时送至连轧工序进行加热、轧制。
实施例
实施例一
本实施例在某单流板坯连铸机进行,断面尺寸为200mm ×1240 mm,钢种为3Cr13,钢种化学成分为:0.26%≤C≤0.35%,Si≤1.00%,Mn≤1.0%,P≤0.035%,S≤0.015%,12.0%≤Cr≤14.0%,Ni≤0.6%,其余为Fe与不可避免的杂质;液相线为1485±5℃。
本实施例实施步骤如下:
Ⅰ、钢水经转炉、LF炉处理后,化学成分如表1所示(其余为Fe与不可避免的杂质),钢水液相线为1483℃:
表1 实施例一钢种化学成分,wt%
C | Si | Mn | P | S | Cr | Ni |
0.32 | 0.51 | 0.40 | 0.025 | 0.001 | 13.5 | 0.16 |
Ⅱ、用天车将钢水从LF炉吊运至连铸机,中间包吹氩6分钟,氩气流量设定220l/min,保证中间包内充满氩气气氛;
Ⅲ、连铸机开浇,中间包钢水浇注温度为:1502±5℃;结晶器冷却水流速控制在8.3m/s;保护渣采用高碳马氏体不锈钢专用保护渣,实测化学成分按质量百分比计:氧化钙:35.6%,二氧化硅:29.8%,氧化镁:1.4%,氧化铝:4.3%,氧化锂1.1%,萤石:10.1%,炭黑:3.4%,氧化钠:11.5%,其余为杂质;浸入式水口插入深度为122mm;拉速为0.90m/min;二冷水比水量为0.80L/kg,二冷电磁搅拌参数为电流600A,频率3.5Hz,换向15s;末端电磁搅拌开启两组,参数均为电流400A,频率8Hz,换向0秒;
Ⅳ、连铸坯出二冷室后表面温度为783℃,随后进保温车送往热连轧厂进行加热、轧制;
下线连铸低倍组织良好,无内部裂纹缺陷,中心疏松和中心偏析均为1.0级(曼内斯曼标准)。
实施例二
本实施例在某单流板坯连铸机进行,断面尺寸为200mm ×1280 mm,钢种为4Cr13,钢种化学成分为:0.36%≤C≤0.45%,Si≤0.8%,Mn≤0.8%,P≤0.04%,S≤0.03%,12.0%≤Cr≤14.0%,Ni≤0.6%,其余为Fe与不可避免的杂质;液相线为1475±5℃。
本实施例实施步骤为:
Ⅰ、钢水经转炉、LF炉处理后,化学成分如表2所示(其余为Fe与不可避免的杂质):
表2 实施例二钢种化学成分,wt%
C | Si | Mn | P | S | Cr | Ni |
0.40 | 0.56 | 0.37 | 0.022 | 0.001 | 13.6 | 0.23 |
Ⅱ、用天车将钢水从LF炉吊运至连铸机,中间包吹氩7分钟,氩气流量为220l/min,保证中间包内充满氩气气氛;
Ⅲ、连铸机开浇,中间包钢水浇注温度为:1495±5℃;冷却水流速控制在8.3m/s;保护渣采用高碳马氏体不锈钢钢专用保护渣,实测化学成分按质量百分比计:氧化钙:36.3%,二氧化硅:28.8%,氧化镁:1.3%,氧化铝:3.8 %,氧化锂0.9%,萤石:9.6%,炭黑:3.3%,氧化钠:11.2%,其余为杂质;浸入式水口插入深度:124mm;拉速:0.90m/min;二冷水比水量:0.80L/kg,二冷电磁搅拌参数为电流600A,频率3.5Hz,换向15s;末端电磁搅拌开启两组,参数均为电流400A,频率8Hz,换向0秒;
Ⅳ、连铸坯出二冷室后表面温度为763℃,随后进保温车送往热连轧厂进行加热、轧制;
Ⅶ、下线连铸低倍组织良好,无裂纹缺陷,中心疏松和缩孔等级均为1.0级(曼内斯曼标准)。
一种提升高碳马氏体不锈钢连铸坯内部质量的工艺方法,需保护的技术特征有:
1) 浇注过程采用低过热度浇注方式,钢水过热度控制在15-30℃;
2)浇注过程采用“二冷+末端”组合式电磁搅拌,其中二冷区电磁搅拌为“箱式”,安装于扇形1段内弧侧,工艺参数为电流500-600A,频率3-4Hz,换向10-15秒;凝固末端电磁搅拌为“辊式”,共两组,第一组安装于扇形3段进口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒;第二组安装于扇形3段出口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒。
以上所述仅为本发明的具体实施例,但本发明所保护范围的结构特征并不限于此,任何本领域的技术人员在本发明的领域内,所作的变化或修饰皆涵盖在本发明的专利范围内。
Claims (1)
1.一种高碳马氏体不锈钢连铸的方法,其特征在于:包括以下步骤:1)预处理铁水经转炉、LF炉等工序冶炼成合格钢水后,用天车吊运至连铸叉臂;
2)连铸全程做好保护浇注,开浇前中间包吹氩5-15分钟,氩气流量按200-300L/min控制,确保开浇时中间包内充满氩气气氛;钢水浇注过程中确保长水口与钢包下水口连接处、中包上水口与浸入式水口连接处全部氩封,浇注过程中保证长水口全部埋入中间包内,确保中间包液面和结晶器液面平稳;
3)钢水浇注过程主要参数:中间包钢水采用低过热度浇注,过热度控制在15-30℃;拉速按0.9±0.1m/min控制;钢水在结晶器中采用强冷方式,冷却水流速控制在8-9m/s;进入二次冷却区后,二冷水比水量按0.8L/kg控制;浸入式水口插入深度按120±5mm控制;浇注过程使用高碳马氏体不锈钢专用保护渣,其主要化学成分以质量百分比计:氧化钙32.0%-38.0%,二氧化硅26.0%-30.0%,氧化镁1.0%-3.0%,氧化铝3.0%-5.0 %,氧化锂0.4%-1.2%,氧化钠11.0%-15.0%,炭黑3.5%-4.5%,萤石8.0%-12.0%,其余为杂质;
4)浇注过程采用“二冷+末端”组合式电磁搅拌,其中二冷区电磁搅拌为“箱式”,安装于扇形1段内弧侧,工艺参数为
电流500-600A,频率3-4Hz,换向10-15秒;凝固末端电磁搅拌为“辊式”,共两组,第一组安装于扇形3段进口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒;第二组安装于扇形3段出口,工艺参数为电流300-400A,频率6-8Hz,换向0-10秒;
5)连铸坯采用“热装热送”工艺,下线连铸坯及时送至连轧工序进行加热、轧制。
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