JP5836619B2 - 耐酸性良好な二相ステンレス鋼 - Google Patents
耐酸性良好な二相ステンレス鋼 Download PDFInfo
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- JP5836619B2 JP5836619B2 JP2011069832A JP2011069832A JP5836619B2 JP 5836619 B2 JP5836619 B2 JP 5836619B2 JP 2011069832 A JP2011069832 A JP 2011069832A JP 2011069832 A JP2011069832 A JP 2011069832A JP 5836619 B2 JP5836619 B2 JP 5836619B2
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- 239000002253 acid Substances 0.000 title claims description 42
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims description 31
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 description 44
- 238000005260 corrosion Methods 0.000 description 44
- 229910000831 Steel Inorganic materials 0.000 description 33
- 239000010959 steel Substances 0.000 description 33
- 230000000694 effects Effects 0.000 description 19
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 230000007423 decrease Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 12
- 229910001566 austenite Inorganic materials 0.000 description 11
- 229910052718 tin Inorganic materials 0.000 description 11
- 229910001220 stainless steel Inorganic materials 0.000 description 9
- 229910052761 rare earth metal Inorganic materials 0.000 description 8
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 150000004767 nitrides Chemical class 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052747 lanthanoid Inorganic materials 0.000 description 2
- 150000002602 lanthanoids Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 208000009205 Tinnitus Diseases 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Description
ただし、式中の各元素名は、その含有量(質量%)を表す。
GI=−Cr+18Ni+30Cu+30Mo−10Mn+100Sn …(a)
PVB=S−(Ca+0.3Mg+0.1REM)+0.01Sn−B …(b)
(a)式において、各元素名は、その含有量(質量%)を表し、(b)式において、各元素名は、その含有量(質量ppm)を表す。
GI=−Cr+18Ni+30Cu+30Mo−10Mn+100Sn …(a)
(a)式において、各元素名は、その含有量(%)を表す。
PVB=S−(Ca+0.3Mg+0.1REM)+0.01Sn−B …(b)
(b)式において、各元素名は、その含有量(ppm)を表す。
GI =−Cr+18Ni+30Cu+30Mo−10Mn+100Sn …(a)
PVB=S−(Ca+0.3Mg+0.1REM)+0.01Sn−B …(b)
を意味し、(a)式において、各元素名は、その含有量(%)を表し、(b)式において、各元素名は、その含有量(ppm)を表す。
圧延材約700mmのうち最も長い耳割れの長さを耳割れ長さを評価した。後工程である冷間圧延等に支障がなく、また、歩留りを考慮して製造性が良好と判断できる5mmを基準とし、耳割れ長さが5mm以下であれば合格と判定した。
表層から25×25×3mmの試験片を採取し、試験片の表面を#600研磨し、20%硫酸中に浸漬した。浸漬直後、鉄くぎを10s接触させることにより、試験片表面を活性化させ、30分間浸漬した。その後、試験前後の重量変化より腐食速度を算出し、鋼種間の耐酸性を比較した。腐食速度が、一般的に耐酸性が求められるケミカルタンカーなどの用途において最低限必要とされる、1.00mm/y以下であれば合格と判定した。
JISG0577に準拠した孔食電位測定を行った。具体的には、表層から25×10×2mmの試験片を採取し、1cm2の試験面を残し、シリコン被覆材で被覆した試験片を準備した。試験開始直前に#600研磨をし、不動態皮膜を除去した試験片について、50℃、Ar脱気した1.0mol/LのNaCl水溶液中に浸漬して10min後、速度20mV/minで電位を掃印し、電流密度が100mA/cm2を示した際の電位を孔食電位とした。孔食電位が、耐酸性が求められる用途において最低限必要とされる、0.20Vvs.SSE以上であれば合格と判定した。
Claims (2)
- 質量%で、
C :0.06%以下、
Si:0.1〜1.5%、
Mn:2.0〜6.0%、
P :0.05%以下、
S :0.005%以下、
Cr:21.0〜26.0%、
Ni:2.0〜5.0%、
Mo:0.36〜2.0%、
Cu:0.5超〜2.5%、
Al:0.003〜0.050%、
O :0.007%以下、
N :0.10〜0.30%、
Sn:0.03〜0.2%、及び、
B:0.0005〜0.005%
を含有し、さらに、
Ca:0.0050%以下、
Mg:0.0030%以下、及び
REM:0.10%以下
から選ばれる1種又は2種以上を含有し、残部がFe及び不可避的不純物からなり、
下記(a)式で表されるGI値が80以上、130以下、
下記(b)式で表されるPVB値が−5以下、
を満たすことを特徴とする耐酸性良好な二相ステンレス鋼。
GI=−Cr+18Ni+30Cu+30Mo−10Mn+100Sn …(a)
PVB=S−(Ca+0.3Mg+0.1REM)+0.01Sn−B …(b)
(a)式において、各元素名は、その含有量(質量%)を表し、(b)式において、各元素名は、その含有量(質量ppm)を表す。 - さらに、質量%で、
V :0.05〜0.5%、
Nb:0.01〜0.20%、及び、
Ti:0.003〜0.05%
から選ばれる1種又は2種以上を含有することを特徴とする請求項1に記載の耐酸性良好な二相ステンレス鋼。
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JP2011069832A JP5836619B2 (ja) | 2011-03-28 | 2011-03-28 | 耐酸性良好な二相ステンレス鋼 |
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JP2011069832A JP5836619B2 (ja) | 2011-03-28 | 2011-03-28 | 耐酸性良好な二相ステンレス鋼 |
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JP2012201960A JP2012201960A (ja) | 2012-10-22 |
JP5836619B2 true JP5836619B2 (ja) | 2015-12-24 |
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Cited By (1)
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CN109844153A (zh) * | 2016-10-06 | 2019-06-04 | 杰富意钢铁株式会社 | 原油油船用钢材和原油油船 |
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KR102154579B1 (ko) * | 2016-02-17 | 2020-09-10 | 닛테츠 스테인레스 가부시키가이샤 | 페라이트-오스테나이트계 2상 스테인리스 강재와 그 제조 방법 |
CN107988555A (zh) * | 2017-11-30 | 2018-05-04 | 振石集团东方特钢有限公司 | 一种含稀土的资源节约型双相不锈钢 |
CN107988556A (zh) * | 2017-11-30 | 2018-05-04 | 振石集团东方特钢有限公司 | 一种新型含锡双相不锈钢 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0297651A (ja) * | 1988-09-30 | 1990-04-10 | Aichi Steel Works Ltd | 制御圧延性の優れた快削オーステナイト系ステンレス鋼およびその製造方法 |
JP5546178B2 (ja) * | 2008-08-04 | 2014-07-09 | 新日鐵住金ステンレス株式会社 | 耐鋳塊割れ性と加工性に優れたフェライト・オーステナイト系ステンレス鋼およびその製造方法 |
JP2011021248A (ja) * | 2009-07-16 | 2011-02-03 | Jfe Steel Corp | 塗装耐食性に優れた船舶用鋼材 |
WO2012004464A1 (fr) * | 2010-07-07 | 2012-01-12 | Arcelormittal Investigación Y Desarrollo Sl | Acier inoxydable austéno-ferritique à usinabilité améliorée |
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Cited By (2)
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CN109844153A (zh) * | 2016-10-06 | 2019-06-04 | 杰富意钢铁株式会社 | 原油油船用钢材和原油油船 |
CN109844153B (zh) * | 2016-10-06 | 2021-02-02 | 杰富意钢铁株式会社 | 原油油船用钢材和原油油船 |
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