EP 0814172 A1 19971229 - Powder metallurgy hot-work tool steel, and process for its manufacture
Title (en)
Powder metallurgy hot-work tool steel, and process for its manufacture
Title (de)
PM-Warmarbeitsstahl und Verfahren zu dessen Herstellung
Title (fr)
Acier à outils pour travail à chaud, obtenu par métallurgie des poudres et procédé pour sa fabrication
Publication
Application
Priority
EP 96109706 A 19960617
Abstract (en)
A powder metallurgically produced hot work steel has the composition (by wt.) 0.25-0.45% C, 2.40-4.25% Cr, 2.50-4.40% Mo, 0.20-0.95% V, 2.10-3.90% Co, 0.10-0.80% Si, 0.15-0.65% Mn, balance Fe and impurities. Preferably, the steel has a purity K1 of less than 10 mu m. Also claimed is powder metallurgical production of the above hot work steel by (a) atomising a steel melt of the above composition in a high purity nitrogen atmosphere; (b) filling the resulting powder into capsules designed such that the final product achieves its intended shape with maximum material yield; (c) shaking the filled capsules to achieve maximum filling density; (d) evacuating and then gas-tightly sealing the capsules; and (e) hot isostatically pressing the capsules at 1000-1230 degrees C and 0.8-3.5 (preferably 1) kbar pressure for ≥ 3 hrs.
Abstract (de)
Ein pulvermetallurgisch hergestellter Warmarbeitsstahl besteht aus (in Gew.-%): 0,25 - 0,45 Kohlenstoff, 2,40 - 4,25 Chrom, 2,50 - 4,40 Molybdän, 0,20 - 0,95 Vanadium, 2,10 - 3,90 Kobalt, 0,10 - 0,80 Silicium, 0,15 - 0,65 Mangan, Rest Eisen und gegebenenfalls herstellungsbedingte Verunreinigungen. Die aus der obengenannten Zusammensetzung bestehende Pulvercharge wird gleichzeitig hohen Verdichtungsdrücken und hohen Verdichtungstemperaturen in einer Heißisostatpresse ausgesetzt. <IMAGE>
IPC 1-7
IPC 8 full level
B22F 3/14 (2006.01); B22F 3/15 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/30 (2006.01)
CPC (source: EP KR US)
B22F 3/004 (2013.01 - EP US); B22F 3/1258 (2013.01 - EP US); B22F 3/20 (2013.01 - KR); B22F 9/082 (2013.01 - EP US); C22C 33/0264 (2013.01 - EP US); B22F 2201/02 (2013.01 - EP US); B22F 2201/20 (2013.01 - EP US); B22F 2202/01 (2013.01 - EP US); B22F 2998/10 (2013.01 - EP US); B22F 2999/00 (2013.01 - EP US)
Citation (search report)
- [X] EP 0467857 A1 19920122 - SVILUPPO MATERIALI SPA [IT]
- [X] GB 1590953 A 19810610 - POWDREX LTD
- [X] EP 0327064 A2 19890809 - ANVAL NYBY POWDER AB [SE]
- [Y] C.W.WEGST: "STAHLSCHLÜSSEL", 1989, VERLAG STAHLSCHLÜSSEL WEGST GMBH, MARBACH,DE, XP002019003
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0814172 A1 19971229; EP 0814172 B1 20020911; AT E223975 T1 20020915; DE 59609657 D1 20021017; DK 0814172 T3 20021118; ES 2181827 T3 20030301; JP 3456707 B2 20031014; JP H10510884 A 19981020; KR 100270453 B1 20001201; KR 19990036411 A 19990525; PT 814172 E 20030131; US 6015446 A 20000118; WO 9748829 A1 19971224
DOCDB simple family (application)
EP 96109706 A 19960617; AT 96109706 T 19960617; DE 59609657 T 19960617; DK 96109706 T 19960617; EP 9703119 W 19970616; ES 96109706 T 19960617; JP 50223698 A 19970616; KR 19980701080 A 19980213; PT 96109706 T 19960617; US 1179298 A 19980416