EP 0792944 B1 20020619 - Steel, suitable for manufacture of injection molds for plastics
Title (en)
Steel, suitable for manufacture of injection molds for plastics
Title (de)
Stahl, geeignet für die Herstellung von Spritzgussformen für plastische Werkstoffe
Title (fr)
Acier utilisable notamment pour la fabrication de moules pour injection de matière plastique
Publication
Application
Priority
FR 9602595 A 19960301
Abstract (en)
[origin: EP0792944A1] Steel, which is especially useful for making plastic injection moulds, has the composition (by wt.) 0.03-0.25% C, 0-0.2% Si, 0-0.9% Mn, 1.5-5% Ni, 0-18% Cr, 0.05-1% Mo + one half W, 0-0.3% S, 0.05-3% each of Al and/or Cu, optionally 0-0.3% each of one or more of V, Nb, Zr, Ta and Ti, optionally 0-0.3% each of one or more of Pb, Se, Te and Bi, balance Fe and impurities (especially nitrogen). The composition satisfies the relationships (I) and (II): Kth=3.8 x C+9.8 x Si+3.3 x Mn+2.4 x Ni+ alpha x Cr+1.4 x (Mo+ one half W) ≤ 15 (I) where alpha = 1.4 if the Cr content is less than 8% and alpha = 0 if the Cr content is ≥ 8%; Tr=3.8 x C+1.07 x Mn+0.7 x Ni+0.57 x Cr+1.58 x (Mo+ one half W)+kB ≥ 3.1 (II) where kB = 0.8 the B content is 0.0005-0.015%; otherwise kB = 0; and if the Cr content is ≤ 5%, then composition satisfies relationship (III): Kth divided by Tr = ≤ 3 (III) Also claimed are (i) a block of the above steel which has a characteristic dimension (d) of ≥ 20 mm and which has, at all points, a tempered martensitic, bainitic or martensitic-bainitic structure of hardness greater than 350 HB; and (ii) a welding wire of the above steel.
IPC 1-7
IPC 8 full level
B29C 45/26 (2006.01); C22C 38/00 (2006.01); C22C 38/08 (2006.01); C22C 38/42 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
C22C 38/08 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - KR)
Designated contracting state (EPC)
AT BE DE ES FR GB IT PT SE
DOCDB simple family (publication)
EP 0792944 A1 19970903; EP 0792944 B1 20020619; AT E219526 T1 20020715; CA 2197532 A1 19970901; CN 1070241 C 20010829; CN 1174244 A 19980225; DE 69713415 D1 20020725; DE 69713415 T2 20030109; ES 2176632 T3 20021201; FR 2745587 A1 19970905; FR 2745587 B1 19980430; JP H1036938 A 19980210; KR 100451474 B1 20041116; KR 970065758 A 19971013; MX 9701554 A 19980430; PT 792944 E 20020930; TW 367372 B 19990821; US 5785924 A 19980728
DOCDB simple family (application)
EP 97400354 A 19970218; AT 97400354 T 19970218; CA 2197532 A 19970213; CN 97109968 A 19970228; DE 69713415 T 19970218; ES 97400354 T 19970218; FR 9602595 A 19960301; JP 6227997 A 19970228; KR 19970006308 A 19970227; MX 9701554 A 19970228; PT 97400354 T 19970218; TW 86102546 A 19970304; US 80585197 A 19970303