JP5424917B2 - 耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼 - Google Patents
耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼 Download PDFInfo
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- JP5424917B2 JP5424917B2 JP2010021096A JP2010021096A JP5424917B2 JP 5424917 B2 JP5424917 B2 JP 5424917B2 JP 2010021096 A JP2010021096 A JP 2010021096A JP 2010021096 A JP2010021096 A JP 2010021096A JP 5424917 B2 JP5424917 B2 JP 5424917B2
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- stainless steel
- duplex stainless
- hot workability
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- Prior art date
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- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 description 21
- 239000010959 steel Substances 0.000 description 21
- 238000005336 cracking Methods 0.000 description 18
- 230000007797 corrosion Effects 0.000 description 17
- 238000005260 corrosion Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 229910052758 niobium Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000005098 hot rolling Methods 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 206010039509 Scab Diseases 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 201000004384 Alopecia Diseases 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003676 hair loss Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Description
質量%で、
C:0.005〜0.10%、
Si:0.2〜2.0%、
Mn:0.5〜5.5%、
P:≦0.04%、
S:≦0.002%、
Cr:21.0〜26.0%、
Ni:0.6〜7.5%、
Mo:0.05〜4.0%、
N:0.10〜0.30%、
さらに、
Ti:0.003%以上で、かつ[Ti]×[N]≦0.0020%を満足し、
Nb:0.02%以上で、かつ[Nb]×[N]≦0.010%を満足し、
残部Feおよび不可避的不純物よりなり、かつ下記(1)式で表されるDF値が45以上、70以下を満足することを特徴とする耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼。
DF計算値=7.2×([Cr]+0.88[Mo]+0.78[Si])−8.9×([Ni]+0.03[Mn]+0.72[Cu]+22[C]+21[N])−44.9 ・・・(1)式
上記式中に記載の[Ti]、[Nb]、[N]、[Cr]、[Mo]、[Si]、[Ni]、[Mn]、[Cu]および[C]は、夫々の元素の含有量(質量%)を意味し、含有されていない元素は0(質量%)とする。
Cu:0.2〜2.0%、
Ca:0.0005〜0.003%、
Al:0.02〜0.07%
の1種または2種以上を含有することを特徴とする請求項1記載の耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼。
本発明ではスラブの置き割れと熱間加工割れの発生を防止するために、成分と下記(1)式で表されるDF値を45以上、70以下に規制している。
DF計算値=7.2×([Cr]+0.88[Mo]+0.78[Si])−8.9×([Ni]+0.03[Mn]+0.72[Cu]+22[C]+21[N])−44.9 ・・・(1)式
上記式中に記載の[Cr]、[Mo]、[Si]、[Ni]、[Mn]、[Cu]および[C]は、夫々の元素の含有量(質量%)を意味し、含有されていない元素は0(質量%)とする。
Claims (2)
- 質量%で、
C:0.005〜0.10%、
Si:0.2〜2.0%、
Mn:0.5〜5.5%、
P:≦0.04%、
S:≦0.002%、
Cr:21.0〜26.0%、
Ni:0.6〜7.5%、
Mo:0.05〜4.0%、
N:0.10〜0.30%、
さらに、
Ti:0.003%以上で、かつ[Ti]×[N]≦0.0020%を満足し、
Nb:0.02%以上で、かつ[Nb]×[N]≦0.010%を満足し、
残部Feおよび不可避的不純物よりなり、かつ下記(1)式で表されるDF値が45以上、70以下を満足することを特徴とする耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼。
DF計算値=7.2×([Cr]+0.88[Mo]+0.78[Si])−8.9×([Ni]+0.03[Mn]+0.72[Cu]+22[C]+21[N])−44.9 ・・・(1)式
上記式中に記載の[Ti]、[Nb]、[N]、[Cr]、[Mo]、[Si]、[Ni]、[Mn]、[Cu]および[C]は、夫々の元素の含有量(質量%)を意味し、含有されていない元素は0(質量%)とする。 - 質量%で、更に
Cu:0.2〜2.0%、
Ca:0.0005〜0.003%、
Al:0.02〜0.07%
の1種または2種以上を含有することを特徴とする請求項1記載の耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼。
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JP2010021096A JP5424917B2 (ja) | 2010-02-02 | 2010-02-02 | 耐スラブ置き割れ性および熱間加工性に優れた二相ステンレス鋼 |
Publications (2)
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JP2011157601A JP2011157601A (ja) | 2011-08-18 |
JP5424917B2 true JP5424917B2 (ja) | 2014-02-26 |
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Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2847111C (en) * | 2011-09-06 | 2016-09-06 | Nippon Steel & Sumitomo Metal Corporation | Duplex stainless steel |
CN107385360B (zh) * | 2017-07-06 | 2019-03-05 | 钢铁研究总院 | 一种双相不锈钢钢筋及其制备方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3508715B2 (ja) * | 2000-10-20 | 2004-03-22 | 住友金属工業株式会社 | 高Cr鋼鋳片および継目無鋼管 |
JP5109233B2 (ja) * | 2004-03-16 | 2012-12-26 | Jfeスチール株式会社 | 溶接部耐食性に優れたフェライト・オーステナイト系ステンレス鋼 |
JP5388589B2 (ja) * | 2008-01-22 | 2014-01-15 | 新日鐵住金ステンレス株式会社 | 加工性と衝撃吸収特性に優れた構造部材用フェライト・オーステナイト系ステンレス鋼板およびその製造方法 |
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