JP6797901B2 - 降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板及びカラーメッキの鋼板の製造方法 - Google Patents
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板及びカラーメッキの鋼板の製造方法 Download PDFInfo
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- JP6797901B2 JP6797901B2 JP2018511042A JP2018511042A JP6797901B2 JP 6797901 B2 JP6797901 B2 JP 6797901B2 JP 2018511042 A JP2018511042 A JP 2018511042A JP 2018511042 A JP2018511042 A JP 2018511042A JP 6797901 B2 JP6797901 B2 JP 6797901B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 84
- 239000010959 steel Substances 0.000 title claims description 84
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 title claims description 58
- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 16
- 239000008397 galvanized steel Substances 0.000 title claims description 16
- 238000001816 cooling Methods 0.000 claims description 76
- 238000010438 heat treatment Methods 0.000 claims description 58
- 238000007747 plating Methods 0.000 claims description 45
- 238000005098 hot rolling Methods 0.000 claims description 31
- 238000000137 annealing Methods 0.000 claims description 23
- 239000013078 crystal Substances 0.000 claims description 20
- 239000011701 zinc Substances 0.000 claims description 20
- 229910052725 zinc Inorganic materials 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 17
- 239000011247 coating layer Substances 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 229910052758 niobium Inorganic materials 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 15
- 238000005097 cold rolling Methods 0.000 claims description 14
- 238000005246 galvanizing Methods 0.000 claims description 14
- 229920000728 polyester Polymers 0.000 claims description 14
- 239000002244 precipitate Substances 0.000 claims description 14
- 229910001563 bainite Inorganic materials 0.000 claims description 13
- 229910000734 martensite Inorganic materials 0.000 claims description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 11
- 229910001567 cementite Inorganic materials 0.000 claims description 11
- 238000009499 grossing Methods 0.000 claims description 11
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000003595 mist Substances 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 8
- 238000005554 pickling Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000003618 dip coating Methods 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 239000000047 product Substances 0.000 description 10
- 206010037660 Pyrexia Diseases 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000001186 cumulative effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000012467 final product Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 206010062198 microangiopathy Diseases 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical group FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
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- 238000007670 refining Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
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- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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Description
本発明は、冷間圧延板生産技術領域に属され、降伏強度600MPa以上級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板及びその製造方法に関する。
我が国のカラーメッキ板は主に建築領域に応用されている。壁面プレッシャープレートに高強度、良好な靱性及び優れる耐食性を有することが要求されている。多くの国内ユーザー(特に建築業界のユーザー)は、伸び率を損失しない前提で、構造用カラーメッキ板に対して構造材強度の向上と軽量化によって高強度化・薄肉化及びコストの低下を実現することを需要している。目前の国内で生産されたアルミニウム亜鉛溶融メッキ鋼板はプロセス条件に限られ、降伏強度と引張強度が高い製品の伸び率が高くないため、可塑性に対して要求が高い場合に満足できない。そうすると、アルミニウム亜鉛溶融メッキ鋼板の応用と普及を大きく制限した。
本発明の目的は、降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板及びその製造方法を提供することである。鋼板は降伏強度が≧600MPaであり、引張強度が≧650MPaであり、伸び率が≧12%である優良な力学性能を有し、そのメッキ層が均一且つ緻密である。製品は、良好な強靱性を有しながら、優良な耐食性をも有するため、建築、自動車などの高降伏強度と高伸び率の要求を満足できる。尚、家電、エレベーターなどの電気機器にも用いられ、高強度化・薄肉化を実現できる。
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板であって、その基板化学成分質量百分率表示で、C:0.07%〜0.15%、Si:0.02%〜0.5%、Mn:1.3%〜1.8%、N≦0.004%、S≦0.01%、Ti≦0.20%、Nb≦0.060%、残部がFeおよび他の不可避不純物であり、且つ下の条件を同時に満足する鋼板:
(C+Mn/6)≧0.3%;
Mn/S≧150;
Tiを含有しない時に、Nbが0.01%≦(Nb-0.22C-1.1N)≦0.06%を満足する;
Nbを含有しない時に、Tiが0.5≦Ti/C≦1.5を満足する;
TiとNbを複合添加する時に、0.04%≦(Ti+Nb)≦0.26%。
本発明鋼基板中でC、Siは最も有効で、最も安い固溶強化元素である。C、Siの含有量が増加するにつれて、固溶強化作用が増加される。だが、Siは鋼帯表面に富集され、C元素よりも顕著であり、帯鋼の浸透行為を大きく影響したため、Siの含有量を厳しくコントロールする必要がある。
1)製錬、鋳造:前記成分のように製錬し、鋳造し、鋳造スラブを得る;
2)熱間圧延、酸洗い:加熱出炉温度が1150〜1280℃であり、熱間圧延最終圧延温度が800〜900℃であり、熱間圧延巻取温度が500〜650℃であり、熱間圧延後の冷却方式が水冷である;
3)冷間圧延:冷間圧延圧下量が60〜80%であり、鋼帯を形成する;
4)連続焼なまし:無酸化連続焼なましアルミニウム亜鉛メッキ炉で行い、直燃加熱段、輻射管加熱段、均熱段、メッキ前冷却段、熱張力ロール区域と溶融メッキ段、メッキ後冷却を備えており、直燃加熱段時間が20〜60sであり、加熱温度が650〜710℃であり、輻射管加熱段が30〜60sであり、加熱温度が750〜840℃であり、均熱温度が750〜840℃であり、保温段が1〜10sであり、メッキ後冷却段が8〜15sであり、熱張力ロール区域と溶融メッキ段の時間が8〜12sであり、メッキ後冷却の冷却速度が≧20℃/sである;
5)溶融メッキ:鋼帯を亜鉛ポットに浸入して溶融メッキ処理を行い、メッキ液成分が重量百分率表示で、Al:48〜58%、Zn:40〜50%、Si:1.0〜2.0%、Ti:0.005〜0.050%であり、残部が不可避不純物であり、亜鉛ポット温度が550〜610℃であり、高強度低合金アルミニウム亜鉛溶融メッキ鋼帯を得る;
6)平滑矯正、くせ取り:平滑矯正率が0.25%±0.2であり、くせ取り率が0.2%±0.2である。
ステップ7)のカラーメッキを更に備える。カラーメッキの塗料被覆層は、塗料類別に基づいてフッ化炭素、ポリエステル(PE)、シリコン変性ポリエステル(SMP)、高耐候性ポリエステル(HDP)あるいはポリフッ化ビニリデン(PVDF)である。
本発明に記載の鋼板の微細組織は、フェライト、セメンタイト、微細な析出物と、ベイナイト、マルテンサイト及び変形帯状結晶粒のうちの少なくとも1種の組織とを含む複相組織である。本発明鋼板の降伏強度が≧600MPaであり、引張強度が≧650MPaであり、破断伸び率が≧12%である。
図面の簡単な説明
以下、実施例と図面と結合しながら、本発明についてさらに説明する。
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板(カラーメッキ後の鋼板の厚みが0.6mmだった)の製造方法は下のステップを有した。
1)製錬:溶融鉄の脱硫を行い、転炉製錬して、鋳造して、鋳造スラブを得た。その化学重量百分率で表示すると、C:0.12%、Si:0.075%、Mn:1.5%、N:0.0015%、S:0.008%、Ti:0.001%、Nb:0.045%、残部がFeおよび他の不可避不純物だった;
2)熱間圧延、酸洗い:熱間圧延出炉温度が1230℃であり、熱間圧延最終圧延温度が860℃であり、熱間圧延巻取温度が550℃であり、巻曲前に水焼入れ冷却して、熱間圧延板の厚みが2.7mmだった;
3)冷間圧延:累計圧下率を80%にコントロールして、冷間圧延板の厚みが0.56mmだった;
4)連続焼なまし:無酸化連続焼なまし炉で行い、直火加熱段、輻射管加熱段、均熱及び冷却処理を備えており、直火加熱段が28sであり、加熱温度が660℃であり、誘導加熱時間が38sであり、均熱温度が770℃であり、均熱時間が3sであり、冷却温度が600℃であり、冷却時間が11sだった。保温温度が低かったため、一定の冷間圧延組織強化マトリックスを保留できた;
5)アルミニウム亜鉛溶融メッキ:両面アルミニウム亜鉛溶融メッキ金属層の重量を150g/
m2にコントロールした。そのメッキ層組成は重量百分比表示で、Al:48%、Zn:50%、Si:1%、Ti:0.01%であり、残部が不純物だった。帯鋼を亜鉛ポットに進入した温度を600℃にコントロールして、アルミニウム亜鉛液の温度を580℃にコントロールした。溶融メッキ後の冷却方式は噴冷気冷却だった。急速冷却方式を使用した。基板が均一なフェライト+セメンタイト+ベイナイト+マルテンサイト+一部の変形帯状結晶粒+細小析出物の多相組織だった。図1を参照。
6)平滑矯正、くせ取り、巻いて、使用に備えた;
7)選択的にカラーメッキをした。最終製品の厚みが0.6mmだった。
試験で検測したところ、降伏強度RP0.2が640MPaであり、引張強度Rmが678MPaであり、破断伸び率A80mmが13.5%だった。
実施例2
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板(カラーメッキ後の鋼板の厚みが0.8mmだった)の製造方法は下のステップを有した。
1)製錬:溶融鉄の脱硫を行い、転炉製錬して、鋳造して、鋳造スラブを得た。その化学重量百分率で表示すると、C:0.08%、Si:0.05%、Mn:1.7%、N:0.0018%、S:0.006%、Ti:0.001%、Nb:0.045%、残部がFeおよび他の不可避不純物だった;
2)熱間圧延、酸洗い:熱間圧延出炉温度が1220℃であり、熱間圧延最終圧延温度が850℃であり、熱間圧延巻取温度が600℃であり、巻曲前に水焼入れ冷却して、熱間圧延板の厚みが2.0mmだった;
3)冷間圧延:累計圧下率を62%にコントロールして、冷間圧延板の厚みが0.76mmだった;圧下量が低かったため、再結晶温度を向上して、再結晶完成時間を増加して、該プロセスで一定の冷間圧延組織強化マトリックスを保留できた。
4)連続焼なまし:無酸化連続焼なまし炉で行い、直火加熱段、輻射管加熱段、均熱及び冷却処理を備えており、直火加熱段が32sであり、加熱温度が700℃であり、誘導加熱時間が44sであり、均熱温度が820℃であり、均熱時間が4sであり、冷却温度が590℃であり、冷却時間が12sだった;
5)アルミニウム亜鉛溶融メッキ:両面アルミニウム亜鉛溶融メッキ金属層の重量を150g/m2にコントロールした。そのメッキ層組成は重量百分比表示で、Al:54%、Zn:44%、Si:1%、Ti:0.01%だった。帯鋼を亜鉛ポットに進入した温度を600℃にコントロールして、アルミニウム亜鉛液の温度を590℃にコントロールした。溶融メッキ後の冷却方式が気霧冷却だった。急速冷却方式を使用した。基板が均一なフェライト+セメンタイト+少量のベイナイト+少量のマルテンサイト+少量の変形帯状結晶粒+細小析出物の多相組織だった。図2を参照。
6)平滑矯正、くせ取り、巻いて、使用に備えた;
7)カラーメッキをした。最終製品の厚みが0.8mmだった。
試験で検測したところ、降伏強度RP0.2が627MPaであり、引張強度Rmが711MPaであり、破断伸び率A80mmが13.5%だった。
実施例3
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板(カラーメッキ後の鋼板の厚みが0.75mmだった)の製造方法は下のステップを有した。
1)製錬:溶融鉄の脱硫を行い、転炉製錬して、鋳造して、鋳造スラブを得た。その化学重量百分率で表示すると、C:0.15%、Si:0.3%、Mn:1.4%、N:0.0031%、S:0.01%、Ti:0.087%、Nb:0.011%、残部がFeおよび他の不可避不純物だった;
2)熱間圧延、酸洗い:熱間圧延出炉温度が1230℃であり、熱間圧延最終圧延温度が880℃であり、熱間圧延巻取温度が650℃であり、巻曲前に水焼入れ冷却して、熱間圧延板の厚みが2.6mmだった;
3)冷間圧延:累計圧下率を71%にコントロールして、冷間圧延板の厚みが0.72mmだった;圧下量が適度だった。
4)連続焼なまし:無酸化連続焼なまし炉で行い、直火加熱段、輻射管加熱段、均熱及び冷却処理を備えており、直火加熱段が31sであり、加熱温度が680℃であり、誘導加熱時間が42sであり、均熱温度が780℃であり、均熱時間が4sであり、冷却温度が600℃であり、冷却時間が11sだった;
5)アルミニウム亜鉛溶融メッキ:両面アルミニウム亜鉛溶融メッキ金属層の重量を150g/m2にコントロールした。そのメッキ層組成は重量百分比表示で、Al:52%、Zn:45%、Si:2%、Ti:0.05%だった。帯鋼を亜鉛ポットに進入した温度を600℃にコントロールして、アルミニウム亜鉛液の温度を600℃にコントロールした。溶融メッキ後の冷却方式が気霧冷却だった。急速冷却方式を使用した。基板が均一なフェライト+セメンタイト+ベイナイト+マルテンサイト+変形帯状結晶粒+細小析出物の多相組織だった。図3を参照。
6)平滑矯正、くせ取り、巻いて、使用に備えた;
7)カラーメッキをした。最終製品の厚みが0.75mmだった。
試験で検測したところ、降伏強度RP0.2が619MPaであり、引張強度Rmが702MPaであり、破断伸び率A80mmが13.4%だった。
参考例
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板(カラーメッキ後の鋼板の厚みが0.7mmだった)の製造方法は下のステップを有した。
1)製錬:溶融鉄の脱硫を行い、転炉製錬して、鋳造して、鋳造スラブを得た。その化学重量百分率で表示すると、C:0.10%、Si:0.2%、Mn:1.6%、N:0.001%、S:0.009%、Ti:0.17%、Nb:0.001%、残部がFeおよび他の不可避不純物だった;
2)熱間圧延、酸洗い:熱間圧延出炉温度が1170℃であり、熱間圧延最終圧延温度が890℃であり、熱間圧延巻取温度が630℃であり、巻曲前に水焼入れ冷却して、熱間圧延板の厚みが1.95mmだった;
3)冷間圧延:累計圧下率を66%にコントロールして、冷間圧延板の厚みが0.66mmだった;
4)連続焼なまし:無酸化連続焼なまし炉で行い、直火加熱段、輻射管加熱段、均熱及び冷却処理を備えており、直火加熱段が31sであり、加熱温度が680℃であり、誘導加熱時間が42sであり、均熱温度が835℃であり、均熱時間が3sであり、冷却温度が560℃であり、冷却時間が11sだった;
5)アルミニウム亜鉛溶融メッキ:両面アルミニウム亜鉛溶融メッキ金属層の重量を150g/m2にコントロールした。そのメッキ層組成は重量百分比表示で、Al:51%、Zn:47%、Si:1%、Ti:0.02%であり、残部が不純物だった。帯鋼を亜鉛ポットに進入した温度を560℃にコントロールして、アルミニウム亜鉛液の温度を580℃にコントロールした。溶融メッキ後の冷却方式が噴冷気冷却だった。急速冷却方式を使用した。基板が均一なフェライト+セメンタイト+ベイナイト+マルテンサイト+一部の変形帯状結晶粒+細小析出物の多相組織だった;
6)平滑矯正、くせ取り、巻いて、使用に備えた;
7)選択的にカラーメッキをした。最終製品の厚みが0.7mmだった。
試験で検測したところ、降伏強度RP0.2が623MPaであり、引張強度Rmが708MPaであり、破断伸び率A80mmが14.5%だった。
実施例5
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板(カラーメッキ後の鋼板の厚みが0.7mmだった)の製造方法は下のステップを有した。
1)製錬:溶融鉄の脱硫を行い、転炉製錬して、鋳造して、鋳造スラブを得た。その化学重量百分率で表示すると、C:0.13%、Si:0.09%、Mn:1.5%、N:0.004%、S:0.008%、Ti
:0.001%、Nb:0.051%、残部がFeおよび他の不可避不純物だった;
2)熱間圧延、酸洗い:熱間圧延出炉温度が1190℃であり、熱間圧延最終圧延温度が840℃
であり、熱間圧延巻取温度が590℃であり、巻曲前に水焼入れ冷却して、熱間圧延板の厚みが2.03mmだった;
3)冷間圧延:累計圧下率を70%にコントロールして、冷間圧延板の厚みが0.61mmだった;
4)連続焼なまし:無酸化連続焼なまし炉で行い、直火加熱段、輻射管加熱段、均熱及び冷却処理を備えており、直火加熱段が46sであり、加熱温度が680℃であり、誘導加熱時間が48sであり、均熱温度が760℃であり、均熱時間が7sであり、冷却温度が600℃であり、冷却時間が11sだった。保温温度が低かったため、一定の冷間圧延組織強化マトリックスを保留できた。
5)アルミニウム亜鉛溶融メッキ:両面アルミニウム亜鉛溶融メッキ金属層の重量を150g/m2にコントロールした。そのメッキ層組成は重量百分比表示で、Al:52%、Zn:46%、Si:1%、Ti:0.03%であり、残部が不純物だった。帯鋼を亜鉛ポットに進入した温度を600℃にコントロールして、アルミニウム亜鉛液の温度を600℃にコントロールした。溶融メッキ後の冷却方式が噴冷気冷却だった。急速冷却方式を使用した。基板が均一なフェライト+セメンタイト+ベイナイト+マルテンサイト+一部の変形帯状結晶粒+細小析出物の多相組織だった;
6)平滑矯正、くせ取り、巻いて、使用に備えた;
7)選択的にカラーメッキをした。最終製品の厚みが0.65mmだった。
試験で検測したところ、降伏強度RP0.2が641MPaであり、引張強度Rmが685MPaであり、破断伸び率A80mmが13.2%だった。
実施例6
降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキ・カラーメッキの鋼板(カラーメッキ後の鋼板の厚みが0.7mmだった)の製造方法は下のステップを有した。
1)製錬:溶融鉄の脱硫を行い、転炉製錬して、鋳造して、鋳造スラブを得た。その化学重量百分率で表示すると、C:0.12%、Si:0.09%、Mn:1.5%、N:0.004%、S:0.008%、Ti:0.04%、Nb:0.035%、残部がFeおよび他の不可避不純物だった;
2)熱間圧延、酸洗い:熱間圧延出炉温度が1160℃であり、熱間圧延最終圧延温度が810℃であり、熱間圧延巻取温度が510℃であり、巻曲前に水焼入れ冷却して、熱間圧延板の厚みが2.35mmだった;
3)冷間圧延:累計圧下率を72%にコントロールして、冷間圧延板の厚みが0.66mmだった;
4)連続焼なまし:無酸化連続焼なまし炉で行い、直火加熱段、輻射管加熱段、均熱及び冷却処理を備えており、直火加熱段が31sであり、加熱温度が680℃であり、誘導加熱時間が42sであり、均熱温度が780℃であり、均熱時間が3sであり、冷却温度が585℃であり、冷却時間が11sだった。保温温度が低かったため、一定の冷間圧延組織強化マトリックスを保留できた。
5)アルミニウム亜鉛溶融メッキ:両面アルミニウム亜鉛溶融メッキ金属層の重量を150g/m2にコントロールした。そのメッキ層組成は重量百分比表示で、Al:51%、Zn:47%、Si:1%、Ti:0.03%であり、残部が不純物だった。帯鋼を亜鉛ポットに進入した温度を585℃にコントロールして、アルミニウム亜鉛液の温度を550℃にコントロールした。溶融メッキ後の冷却方式が噴冷気冷却だった。急速冷却方式を使用した。基板が均一なフェライト+セメンタイト+ベイナイト+マルテンサイト+一部の変形帯状結晶粒+細小析出物の多相組織だった;
6)平滑矯正、くせ取り、巻いて、使用に備えた;
7)選択的にカラーメッキをした。最終製品の厚みが0.7mmだった。
試験で検測したところ、降伏強度RP0.2が611MPaであり、引張強度Rmが680MPaであり、破断伸び率A80mmが14.2%だった。
Claims (13)
- 基板化学成分の質量百分率表示で、C:0.07%〜0.15%、Si:0.02%〜0.5%、Mn:1.3%〜1.8%、N≦0.004%、S≦0.01%、Ti≦0.20%、Nb≦0.060%、残部がFeおよび他の不可避不純物であり、且つ下の条件を同時に満足する降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板、
(C+Mn/6)≧0.3%;
Mn/S≧150;
Tiを添加しない時に、Nbが0.01%≦(Nb-0.22C-1.1N)≦0.06%を満足する;
Nbを添加しない時に、Tiが0.5≦Ti/C≦1.5を満足する;
TiとNbを複合添加する時に、0.04%≦(Ti+Nb)≦0.26%;
前記鋼板の降伏強度が≧600MPaであり、引張強度が≧650MPaであり、破断伸び率が≧12%であり、
前記アルミニウム亜鉛溶融メッキの鋼板は、重量百分率で、Al:48〜58%、Zn:40〜50%、Si:1.0〜2.0%、Ti:0.005〜0.050%であり、残部が不可避不純物である成分を備えたメッキ層を有することを特徴とする。 - 前記鋼板の微細組織が、フェライト、セメンタイト、析出物と、ベイナイト、マルテンサイト及び変形帯状結晶粒からの少なくとも1種の組織とを含む複相組織であることを特徴とする請求項1に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板。
- アルミニウム亜鉛溶融メッキ後の鋼板表面が銀白色のスパングルであることを特徴とし、銀白色のスパングル結晶粒の直径が10mmよりも小さい請求項1または2のいずれかに記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板。
- 銀白色のスパングル結晶粒の直径が5mmよりも小さいことを特徴とする請求項3に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板。
- 請求項1、2、3または4に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板表面に塗料被覆層を塗布することによってアルミニウム亜鉛溶融メッキの鋼板をカラーメッキすることによって製造される、カラーメッキの鋼板。
- カラーメッキ鋼板表面に塗布される塗料被覆層が、フッ化炭素被覆層、ポリエステル被覆層、シリコン変性ポリエステル被覆層、高耐候性ポリエステル被覆層あるいはポリフッ化ビニリデン被覆層であることを特徴とする請求項5に記載のカラーメッキの鋼板。
- 1)製錬、鋳造:請求項1に記載の成分のように製錬し、鋳造し、鋳造スラブを得る;
2)熱間圧延、酸洗い:加熱出炉温度が1150〜1280℃であり、熱間圧延最終圧延温度が800〜900℃であり、熱間圧延巻取温度が500〜650℃であり、熱間圧延後の冷却方式が水冷である;
3)冷間圧延:冷間圧延圧下量が60〜80%であり、鋼帯を形成する;
4)連続焼なまし:無酸化連続焼なましアルミニウム亜鉛メッキ炉で行い、直燃加熱段、輻射管加熱段、均熱段、メッキ前冷却段、熱張力ロール区域と溶融メッキ段、メッキ後冷却を備えており、直燃加熱段時間が20〜60sであり、加熱温度が650〜710℃であり、輻射管加熱段が30〜60sであり、加熱温度が750〜840℃であり、均熱温度が750〜840℃であり、均熱段が1〜10sであり、メッキ前冷却段が8〜15sであり、熱張力ロール区域と溶融メッキ段の時間が8〜12sであり、メッキ後冷却の冷却速度が≧20℃/sであり、鋼帯を亜鉛ポットに浸入して溶融メッキ処理を行い、メッキ液成分が重量百分率表示で、Al:48〜58%、Zn:40〜50%、Si:1.0〜2.0%、Ti:0.005〜0.050%であり、残部が不可避不純物であり、亜鉛ポット温度が550〜610℃であり、高強度低合金アルミニウム亜鉛溶融メッキ鋼帯を得る;
5)平滑矯正、くせ取り:平滑矯正率が0.25%±0.2%であり、くせ取り率が0.2%±0.2%であることを特徴とする請求項1に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板の製造方法。 - ステップ4)のメッキ後冷却が、噴冷気または気霧冷却を使用することを特徴とする請求項7に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板の製造方法。
- 前記鋼板の微細組織が、フェライト、セメンタイト、析出物と、ベイナイト、マルテンサイト及び変形帯状結晶粒からの少なくとも1種の組織とを含む複相組織であることを特徴とする請求項7に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板の製造方法。
- アルミニウム亜鉛溶融メッキ後の鋼板表面が銀白色のスパングルであることを特徴とし、銀白色のスパングル結晶粒の直径が10mmよりも小さい請求項7に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板の製造方法。
- 銀白色のスパングル結晶粒の直径が5mmよりも小さいことを特徴とする請求項10に記載の降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板の製造方法。
- 方法が、カラーメッキの鋼板を得るために、請求項7、8、9、10または11に記載の方法によって製造された降伏強度600MPa級高伸び率アルミニウム亜鉛溶融メッキの鋼板表面に塗料被覆層を塗布することによってアルミニウム亜鉛溶融メッキの鋼板をカラーメッキすることを備えることを特徴とする、カラーメッキの鋼板の製造方法。
- カラーメッキ鋼板表面に塗布される塗料被覆層が、フッ化炭素被覆層、ポリエステル被覆層、シリコン変性ポリエステル被覆層、高耐候性ポリエステル被覆層あるいはポリフッ化ビニリデン被覆層であることを特徴とする請求項12に記載のカラーメッキの鋼板の製造方法。
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US10941459B2 (en) | 2021-03-09 |
WO2017036261A1 (zh) | 2017-03-09 |
RU2018112070A3 (ja) | 2020-01-24 |
CA2995720C (en) | 2023-06-20 |
RU2739568C2 (ru) | 2020-12-25 |
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