EP 3445878 B1 20200408 - A PROCESS FOR MANUFACTURING A MARTENSITIC STAINLESS STEEL PART FROM A SHEET
Title (en)
A PROCESS FOR MANUFACTURING A MARTENSITIC STAINLESS STEEL PART FROM A SHEET
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES MARTENSITISCHEN ROSTFREIEN STAHLTEILS AUS EINEM BLECH
Title (fr)
PROCÉDÉ DE FABRICATION D'UNE PIÈCE EN ACIER INOXYDABLE MARTENSITIQUE À PARTIR D'UNE TÔLE
Publication
Application
Priority
- IB 2016052302 W 20160422
- IB 2017051636 W 20170321
Abstract (en)
[origin: WO2017182896A1] Process for manufacturing a martensitic stainless steel part, according to which a stainless steel sheet is prepared having the composition: 0.005% ≤ C ≤ 0.3%; 0.2% ≤ Mn ≤ 2.0%; traces ≤ Si ≤ 1.0%; traces ≤ S ≤ 0.01%; traces ≤ P ≤ 0.04%; 10.5% ≤Cr ≤ 7.0%; traces ≤ Ni ≤ 4.0%; traces ≤ Mo ≤ 2.0%; Mo + 2 x W ≤ 2.0%; traces ≤ Cu ≤ 3%; traces ≤ Ti ≤ 0.5%; traces ≤ Al ≤ 0.2%; traces ≤ O ≤ 0.04%; 0.05% ≤ Nb ≤ 1.0%; 0.05% ≤ Nb + Ta ≤ 1.0%; 0.25% ≤ (Nb + Ta )/(C + N) ≤ 8; traces ≤ V ≤ 0.3%; traces ≤ Co ≤ 0.5%; traces ≤ Cu +Ni + Co ≤ 5.0%; traces ≤ Sn ≤ 0.05%; traces ≤ B ≤ 0.1%; traces ≤ Zr ≤ 0.5%; Ti + V + Zr ≤ 0.5%; traces ≤ H ≤ 5 ppm; traces ≤ N ≤ 0.2%; (Mn + Ni) ≥ (Cr - 0.3 – 80 x [(C + N)²]); traces ≤ Ca ≤ 0.002%; traces ≤ rare earth elements and/or Y ≤ 0.06%; the remainder being iron and impurities; the temperature Ms being ≥ 200°C; the temperature Mf being ≥ -50°C; the microstructure being composed of ferrite and/or tempered martensite and from 0.5% to 5% by volume of carbides; the size of the ferritic grains being from 1 to 80 μm; an austenization is carried out, in order to obtain a microstructure containing at most 0.5% of carbides and at most 20% of residual ferrite; the sheet is transferred to a first shaping tool, the sheet remaining at a temperature above Ms and retaining at most 0.5% of carbides and at most 20% of residual ferrite; a first shaping or cutting step is carried out, the sheet remaining at a temperature above Ms and retaining at most 0.5% of carbides and at most 20% of residual ferrite; the sheet is transferred to a second shaping tool; a second shaping step is carried out during which the sheet remains at a temperature above Ms and retains at most 0.5% of carbides and at most 20% of residual ferrite; - if TPn is the temperature reached by the sheet at the end of the last shaping step and Σti is the sum of the durations of the transfer and shaping steps, (TP0-TPn)/Σti is at least 0.5°C/s; - and the sheet is left to cool into a final part having a microstructure containing at most 0.5% of carbides and at most 20% of residual ferrite.
IPC 8 full level
C21D 1/673 (2006.01); C21D 6/00 (2006.01); C21D 7/13 (2006.01); C22C 38/00 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/30 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01)
CPC (source: EP KR RU US)
C21D 1/673 (2013.01 - EP KR US); C21D 6/00 (2013.01 - RU); C21D 6/002 (2013.01 - EP KR US); C21D 6/004 (2013.01 - EP KR US); C21D 6/005 (2013.01 - EP KR US); C21D 6/007 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 7/13 (2013.01 - EP KR US); C21D 8/00 (2013.01 - RU); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/004 (2013.01 - US); C22C 38/005 (2013.01 - EP US); C22C 38/008 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/26 (2013.01 - RU); C22C 38/28 (2013.01 - RU); C22C 38/30 (2013.01 - RU); C22C 38/32 (2013.01 - RU); C22C 38/38 (2013.01 - RU); C22C 38/40 (2013.01 - RU); C22C 38/42 (2013.01 - EP KR US); C22C 38/44 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP KR US); C22C 38/50 (2013.01 - EP KR US); C22C 38/52 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C22C 38/58 (2013.01 - KR); C21D 2211/004 (2013.01 - EP KR US); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2017182896 A1 20171026; AU 2017252037 A1 20181122; BR 112018071587 A2 20190212; BR 112018071587 B1 20220329; CA 3022115 A1 20171026; CN 109415776 A 20190301; CN 109415776 B 20200908; EP 3445878 A1 20190227; EP 3445878 B1 20200408; ES 2805067 T3 20210210; HU E051293 T2 20210301; JP 2019518609 A 20190704; JP 6840771 B2 20210310; KR 102395730 B1 20220509; KR 20180136455 A 20181224; MX 2018012841 A 20190328; RU 2018136969 A 20200422; RU 2018136969 A3 20200515; RU 2724767 C2 20200625; SI 3445878 T1 20200831; US 11001916 B2 20210511; US 2019127829 A1 20190502
DOCDB simple family (application)
IB 2017051636 W 20170321; AU 2017252037 A 20170321; BR 112018071587 A 20170321; CA 3022115 A 20170321; CN 201780039084 A 20170321; EP 17713465 A 20170321; ES 17713465 T 20170321; HU E17713465 A 20170321; JP 2018555193 A 20170321; KR 20187030500 A 20170321; MX 2018012841 A 20170321; RU 2018136969 A 20170321; SI 201730319 T 20170321; US 201716095650 A 20170321