CN113502383A - 一种409l不锈钢冷连轧工艺方法 - Google Patents
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 74
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 74
- 238000005096 rolling process Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005554 pickling Methods 0.000 claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 22
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 17
- 238000005097 cold rolling Methods 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000005098 hot rolling Methods 0.000 claims abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 9
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 7
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 239000012266 salt solution Substances 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000009628 steelmaking Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 235000008373 pickled product Nutrition 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
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Abstract
本发明涉及一种409L不锈钢冷连轧工艺方法,对热轧后的黑皮不锈钢板带进行串联式两连轧,900~1000℃进行连续退火,再依次置入硫酸溶液中进行酸洗,置入硝酸+氢氟酸混酸溶液进行酸洗;两连轧退火酸洗后的不锈钢板带进行冷连轧,冷连轧采用串联式冷连轧机组进行3道次的轧制,得到冷轧后的不锈钢板带;对冷轧后的不锈钢板带进行连续退火,然后置入硫酸钠中性盐溶液中进行电解,电解后的不锈钢板带酸洗,得到冷轧后完全退火并酸洗后的不锈钢板带。优点是:生产的409L不锈钢材料,具有优异的机械性能,满足标准的要求。
Description
技术领域
本发明属于不锈钢生产领域,尤其涉及一种409L不锈钢冷连轧工艺方法。
背景技术
400系含钛不锈钢作为不锈钢的重要分支,因其良好的抗晶间腐蚀能力及优良的焊接性能越来越受到市场青睐,其中409L作为含钛不锈钢的代表钢种,被广泛应用于汽车排气管、冲压制品等行业。传统409L不锈钢冷轧产品采用单机架可逆式冷轧机组进行5~9道次的轧制,得到冷轧后的不锈钢板带。采用单轧机进行轧制,生产效率较低。
发明内容
为克服现有技术的不足,本发明的目的是提供一种409L不锈钢冷连轧工艺方法,采用黑皮钢卷两连轧+串联式三站轧机进行轧延的方式得到与单轧机可逆式冷轧机组生产的产品具有同样的机械性能。
为实现上述目的,本发明通过以下技术方案实现:
一种409L不锈钢冷连轧工艺方法,包括以下步骤:
1)对热轧后的黑皮不锈钢板带进行串联式两连轧,900~1000℃进行连续退火,退火时间为150±50秒,得到黑皮两连轧退火后的不锈钢板带;将黑皮不锈钢板带置入硫酸溶液中进行酸洗,再置入硝酸+氢氟酸混酸溶液进行酸洗,得到两连轧退火酸洗后的不锈钢板带;
2)两连轧退火酸洗后的不锈钢板带进行冷连轧,冷连轧采用串联式冷连轧机组进行3道次的轧制,得到冷轧后的不锈钢板带;对冷轧后的不锈钢板带在900~1000℃进行连续退火,退火时间为150±50秒,得到冷轧退火后的不锈钢板带;将不锈钢板带置入硫酸钠中性盐溶液中进行电解,得到冷轧退火电解后的不锈钢板带;将冷轧退火电解后的不锈钢板带酸洗,得到冷轧后完全退火并酸洗后的不锈钢板带。
步骤1)所述的黑皮不锈钢板带的生产方法包括以下步骤:
1)连铸:连铸拉速1~1.5m/min,二冷阶段施加强电磁搅拌,电流1000~2000A,铸坯中等轴晶比例不低于50%;
2)热轧:将铸坯送入加热炉内进行加热;出炉温度控制在1100~1200℃,在炉时间3~4h;热轧粗轧采用5-7道次轧制,得到厚度30~40mm的中间厚度板坯;精轧采用串联式7站轧制,得到2.0mm~10.0mm厚度的黑皮不锈钢板带。
步骤1)中所述的串联式两连轧的压下率25%~50%。
步骤2)中所述的3道次的轧制的压下率40%~70%。
与现有技术相比,本发明的有益效果是:
本发明采用黑皮两连轧+冷轧三连轧方式生产409L不锈钢材料,具有优异的机械性能,满足标准的要求,其中,抗拉强度380~450Mpa,屈服强度170~270Mpa,延伸率28%~45%。晶粒级别为6.0~8.0,具有优异的机械性能。同时采用本发明方法制得钢板因采用连续冷轧工艺,生产效率与生产成本更低。
附图说明
图1是实施例1的金相图(6#晶粒)。
图2是实施例2的金相图(6.5#晶粒)。
具体实施方式
下列实施例中,炼钢均采用废钢+合金,通过电炉炼钢、AOD粗脱碳、VOD深脱碳三步法炼钢并在VOD结束后进行钛线及硅钙线处理;连铸:连铸拉速1~1.5m/min,二冷阶段施加强电磁搅拌,电流1000~2000A,铸坯中等轴晶比例不低于50%;热轧:将铸坯送入加热炉内进行加热;铸坯依次经预热段、加热段和均热段处理后出炉;出炉温度控制在1100~1200℃,在炉时间3~4h;热轧粗轧采用5~7道次轧制,得到厚度30~40mm的中间厚度板坯;精轧采用串联式7站轧制,得到2.0mm~10.0mm厚度的黑皮不锈钢板带。
实施例1:
经过炼钢连铸后,409L不锈钢成分控制如表1:
表1实施例1化学成分
钢种 | C | Si | Mn | P | S | Cr | N | Ti |
409L | 0.0070 | 0.48 | 0.30 | 0.0270 | 0.0005 | 11.30 | 0.0050 | 0.17 |
对热轧后的黑皮不锈钢板带(厚度3.5mm、宽度1250mm)进行黑皮两连轧,单站压下率15%~30%得到2.0mm的中间厚度,然后在950℃下退火,退火时间130s。再进行硫酸酸洗(浓度223g/l),然后进行硝酸(浓度75g/l)+氢氟酸(浓度3g/l)混酸酸洗,得到黑皮两连轧后退火酸洗产品。
对黑皮两连轧后退火酸洗产品进行三轧冷连轧,单站压下率15%~25%得到0.75mm厚度的冷轧后钢带。对冷轧后钢带在950℃进行2min退火得到冷轧退火后的不锈钢板带。将此不锈钢板带置入硫酸钠中性盐溶液中进行电解,得到冷轧退火电解后的不锈钢板带。将冷轧退火电解后的不锈钢板带置入硝酸和氢氟酸混合溶液中酸洗,得到冷轧后完全退火并酸洗后的不锈钢板带。
见图1,实施例1中钢带最终厚度0.75mm,生产过程中电解及酸洗工艺条件如表2,成品不锈钢板带的机械性能见表3:
表2实施例1的冷连轧电解及酸洗工艺条件
硫酸钠浓度 | 电解电流 | 电解温度 | 硝酸浓度 | 氢氟酸浓度 | 混酸温度 |
213g/l | 2500A | 75℃ | 75g/l | 2g/l | 47℃ |
表3实施例1中钢板机械性能
实施例2:
经过炼钢连铸后,409L不锈钢成分控制如表4:
表4实施例2化学成分
钢种 | C | Si | Mn | P | S | Cr | N | Ti |
409L | 0.009 | 0.50 | 0.35 | 0.0260 | 0.0007 | 11.40 | 0.0070 | 0.18 |
对热轧后的黑皮钢带(厚度4.0mm、宽度1250mm)进行黑皮钢带两连轧,单站压下率15%~30%得到2.5mm的中间厚度,然后在945℃下退火,退火时间115s。再进行硫酸酸洗(浓度230g/l),然后进行硝酸(浓度80g/l)+氢氟酸(浓度2g/l)混酸酸洗,得到黑皮两连轧后退火酸洗产品。
对黑皮两连轧后退火酸洗产品进行三轧冷连轧,单站压下率15%~25%得到0.96mm厚度。对冷轧后钢带在960℃进行115秒退火得到冷轧退火后的不锈钢板带。将此不锈钢板带置入硫酸钠中性盐溶液中进行电解,得到冷轧退火电解后的不锈钢板带。将所述冷轧退火电解后的不锈钢板带置入硝酸和氢氟酸混合溶液中酸洗,得到冷轧后完全退火并酸洗后的不锈钢板带。
见图2,实施例2中钢带最终厚度0.96mm,生产过程中电解及酸洗工艺条件如表5,成品不锈钢板带的机械性能见表6:
表5实施例2的冷连轧电解及酸洗工艺条件
硫酸钠浓度 | 电解电流 | 电解温度 | 硝酸浓度 | 氢氟酸浓度 | 混酸温度 |
245g/l | 2300A | 72℃ | 68g/l | 1.5g/l | 47℃ |
表6实施例2中钢板机械性能
Claims (4)
1.一种409L不锈钢冷连轧工艺方法,其特征在于,包括以下步骤:
1)对热轧后的黑皮不锈钢板带进行串联式两连轧,900~1000℃进行连续退火,退火时间为150±50秒,得到黑皮两连轧退火后的不锈钢板带;将黑皮不锈钢板带置入硫酸溶液中进行酸洗,再置入硝酸+氢氟酸混酸溶液进行酸洗,得到两连轧退火酸洗后的不锈钢板带;
2)两连轧退火酸洗后的不锈钢板带进行冷连轧,冷连轧采用串联式冷连轧机组进行3道次的轧制,得到冷轧后的不锈钢板带;对冷轧后的不锈钢板带在900~1000℃进行连续退火,退火时间为150±50秒,得到冷轧退火后的不锈钢板带;将不锈钢板带置入硫酸钠中性盐溶液中进行电解,得到冷轧退火电解后的不锈钢板带;将冷轧退火电解后的不锈钢板带酸洗,得到冷轧后完全退火并酸洗后的不锈钢板带。
2.根据权利要求1所述的一种409L不锈钢冷连轧工艺方法,其特征在于,步骤1)所述的黑皮不锈钢板带的生产方法包括以下步骤:
1)连铸:连铸拉速1~1.5m/min,二冷阶段施加强电磁搅拌,电流1000~2000A,铸坯中等轴晶比例不低于50%;
2)热轧:将铸坯送入加热炉内进行加热;出炉温度控制在1100~1200℃,在炉时间3~4h;热轧粗轧采用5-7道次轧制,得到厚度30~40mm的中间厚度板坯;精轧采用串联式7站轧制,得到2.0mm~10.0mm厚度的黑皮不锈钢板带。
3.根据权利要求1所述的一种409L不锈钢冷连轧工艺方法,其特征在于,步骤1)中所述的串联式两连轧的压下率25%~50%。
4.根据权利要求1所述的一种409L不锈钢冷连轧工艺方法,其特征在于,步骤2)中所述的3道次的轧制的压下率40%~70%。
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