CN115110084A - 一种双相不锈钢冷轧带钢酸洗方法 - Google Patents
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- 238000005554 pickling Methods 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 34
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 238000005422 blasting Methods 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
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 9
- -1 iron ions Chemical class 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 abstract description 2
- 238000005201 scrubbing Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
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- C—CHEMISTRY; METALLURGY
- 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
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
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Abstract
本发明涉及带钢酸洗领域。一种双相不锈钢冷轧带钢酸洗方法,采用退火+破鳞+抛丸+硫酸酸洗+重刷刷洗+混酸酸洗。硫酸酸洗,硫酸浓度为250‑320g/l,温度为75‑85℃,硫酸酸洗过程,铁离子浓度小于35g/l;重刷,重刷转速为500‑750rpm,功率为50‑70KW;混酸酸洗,使用硝酸和氢氟酸混合酸洗,先使用140‑180g/l的硝酸,后使用25‑35g/l氢氟酸,混酸酸洗过程,温度40‑50℃,铁离子浓度小于40g/l,双相不锈钢冷轧带钢速度20‑25m/min。
Description
技术领域
本发明涉及带钢酸洗领域。
背景技术
双相不锈钢冷轧带钢生产经冶炼后连铸,热轧后退火酸洗,对于原料酸洗方法一般是破鳞+抛丸+硫酸酸洗+混酸酸洗,混合酸洗一般都采用含有氢氟酸和硝酸的混合酸。
双相钢主要在冷轧厂2#热线生产,由于双相钢较难酸洗,2#热线生产速度只有10-12m/min,目前双相钢的订单量逐渐增加,通过尝试硫酸添加促进剂和使用次重刷的两种方式提高效率,但是硫酸添加促进剂工艺较复杂,且不够稳定,浓度难以控制在范围内,且存在安全和质量隐患;使用次重刷由于刷毛相对于普通刷辊能够使表面更加均匀,但对速度提升不大。
发明内容
本发明所要解决的技术问题是:如何提供一种新的S32205双相不锈钢酸洗方法,提升酸洗效率,降低生产成本,释放热线产能,带钢表面质量一致性更好,满足客户使用要求。
本发明所采用的技术方案是:一种双相不锈钢冷轧带钢酸洗方法,其该双相不锈钢按重量百分比计,C<0.02%,0.3%<Si<0.51%,0.8%<Mn <1.33%,Cr 21.00~22.52%,Ni 5.00~5.39%,Mo 3.00~3.10%,余量为Fe及其他不可避免的杂质元素,该双相不锈钢冷轧带钢的厚度≤5mm,按如下步骤进行酸洗
步骤一、退火,退火温度1050±10℃,保温时间为230s至288s;
步骤二、破鳞,破鳞按照张力模式控制,张力设定为320-600KN;
步骤三、抛丸,抛丸机转速为1650-1950rpm,电流控制在90-105A;
步骤四、硫酸酸洗,硫酸浓度为250-320g/l,温度为75-85℃,硫酸酸洗过程,铁离子浓度小于35g/l;
步骤五、重刷,重刷转速为500-750rpm,功率为50-70KW;
步骤六、混酸酸洗,使用硝酸和氢氟酸混合酸洗,先使用140-180g/l的硝酸,后使用25-35g/l氢氟酸,混酸酸洗过程,温度40-50℃,铁离子浓度小于40g/l,双相不锈钢冷轧带钢速度20-25m/min。
本发明的有益效果是:本发明主要用于双相不锈钢的酸洗,能够在生产效率提升的前提下保证钢板表面铁鳞洗净,色泽均匀。本发明生产效率较之前提升100%,现有生产速度约为10-12m/min,使用本发明生产双相不锈钢能够将速度提升到20-25m/min。
本发明可以降低生产成本,双相钢每年约8000吨,热线双相钢酸洗工序成本约600元/吨,使用本发明酸洗成本降低8000*600/2=240万元。
本发明实用性强,可释放产能,折合成4.0mm*1540mm的304,能够增加产能8000吨/年X(20m/min÷10m/min-1)=8000吨/年。
具体实施方式
以下实施例用于说明本发明,但不能用来限制本发明的范围。
本实施例以S32205双相不锈钢带钢为例进行说明。
该双相不锈钢带钢化学成分(按重量百分比计)由如下元素组成:C =0.01%,Si=0.5%,Mn=1%,Cr=22%,Ni 5.2%,Mo=3.05%,余量为Fe及其他不可避免的杂质元素,该双相不锈钢冷轧带钢的厚度=4mm,按如下步骤进行酸洗
目前已在太钢不锈钢股份有限公司不锈冷轧厂3#热线、2#热线实施。将厚度4mm的双相不锈钢冷轧带钢转移到3#热线生产,冷轧原料退火酸洗采用退火+破鳞+抛丸+硫酸酸洗+重刷刷洗+混酸酸洗。
带钢经过退火炉退火,18区板温按照1050±10℃控制,退火时间为230s至288s。
退火后进行破鳞,破鳞按照张力模式控制,张力设定为320-600KN。
破鳞之后进行抛丸,抛丸机使用6台抛丸机,转速为1650-1950rpm,电流控制在90-105A。
硫酸酸洗使用硫酸酸洗,硫酸浓度为250-320g/l,温度为75-85℃,铁离子浓度控制在35g/l以内。
使用2组重刷,重刷刷毛材质为掺杂碳化硅的硬质刷毛,使用日本contany公司进口刷毛,在国内公司进行组装。相对普通刷辊使用多丝缠绕方式,通过使刷毛的根部变粗,刷毛的腰部则变硬,提高清洗性能。重刷转速为500-750rpm,功率为50-70KW。
混酸酸洗使用硝酸和氢氟酸混合酸洗,使用两段混酸,硝酸浓度为140-180g/l,氢氟酸浓度为25-35g/l,温度控制在40-50℃,铁离子浓度控制在40g/l以内。
速度:20-25m/min(以洗净表面为原则)。
机组故障处理,如热处理过程中出现停车降温情况,为了避免热处理炉中低温的钢带出现析出相而引起断带,在机组开动之前,热处理炉中钢带需按照1050℃进行保温8min。
以上实施方式仅用于说明本发明,而非对本发明的限制。尽管参照实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,对本发明的技术方案进行各种组合、修改或者等同替换,都不脱离本发明技术方案的精神和范围,均应涵盖在本发明的权利要求范围当中。
Claims (1)
1.一种双相不锈钢冷轧带钢酸洗方法,其特征在于:该双相不锈钢按重量百分比计,C<0.02%,0.3%<Si<0.51%,0.8%<Mn <1.33%,Cr 21.00~22.52%,Ni 5.00~5.39%,Mo 3.00~3.10%,余量为Fe及其他不可避免的杂质元素,该双相不锈钢冷轧带钢的厚度≤5mm,按如下步骤进行酸洗
步骤一、退火,退火温度1050±10℃,保温时间为230s至288s;
步骤二、破鳞,破鳞按照张力模式控制,张力设定为320-600KN;
步骤三、抛丸,抛丸机转速为1650-1950rpm,电流控制在90-105A;
步骤四、硫酸酸洗,硫酸浓度为250-320g/l,温度为75-85℃,硫酸酸洗过程,铁离子浓度小于35g/l;
步骤五、重刷,重刷转速为500-750rpm,功率为50-70KW;
步骤六、混酸酸洗,使用硝酸和氢氟酸混合酸洗,先使用140-180g/l的硝酸,后使用25-35g/l氢氟酸,混酸酸洗过程,温度40-50℃,铁离子浓度小于40g/l,双相不锈钢冷轧带钢速度20-25m/min。
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CN115558935A (zh) * | 2022-10-18 | 2023-01-03 | 山西太钢不锈钢股份有限公司 | 一种热轧奥氏体不锈钢带钢表面过烧后的退火酸洗方法 |
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CN102925904A (zh) * | 2012-11-30 | 2013-02-13 | 张家港浦项不锈钢有限公司 | 一种不锈钢宽厚板卷热退火酸洗方法 |
CN109457260A (zh) * | 2018-12-26 | 2019-03-12 | 振石集团东方特钢有限公司 | 一种2205双相不锈钢卷的酸洗方法 |
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KR20120056458A (ko) * | 2010-11-25 | 2012-06-04 | 주식회사 포스코 | 듀플렉스계 스테인리스강의 소둔산세방법 및 이를 이용하여 제조된 듀플렉스 스테인리스강 |
CN102925904A (zh) * | 2012-11-30 | 2013-02-13 | 张家港浦项不锈钢有限公司 | 一种不锈钢宽厚板卷热退火酸洗方法 |
CN109457260A (zh) * | 2018-12-26 | 2019-03-12 | 振石集团东方特钢有限公司 | 一种2205双相不锈钢卷的酸洗方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN115558935A (zh) * | 2022-10-18 | 2023-01-03 | 山西太钢不锈钢股份有限公司 | 一种热轧奥氏体不锈钢带钢表面过烧后的退火酸洗方法 |
CN115558935B (zh) * | 2022-10-18 | 2024-05-03 | 山西太钢不锈钢股份有限公司 | 一种热轧奥氏体不锈钢带钢表面过烧后的退火酸洗方法 |
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