EP 0164678 B1 19890419 - STEEL FOR THE MANUFACTURE OF LARGE FORGINGS AND PROCESS FOR THE TREATMENT OF THIS STEEL
Title (en)
STEEL FOR THE MANUFACTURE OF LARGE FORGINGS AND PROCESS FOR THE TREATMENT OF THIS STEEL
Publication
Application
Priority
FR 8408785 A 19840605
Abstract (en)
[origin: US4689095A] The present invention provides a steel containing, by mass: from 0.16% to 0.22% carbon (C) less than 0.3% silicon (Si) less than 0.5% manganese (Mn) from 0.6% to 0.9% nickel (Ni) from 10.7% to 12.3% chromium (Cr) from 0.8% to 1.1% molybdenum (Mo) from 0.2% to 0.35% vanadium (V) from 0.07% to 0.20% niobium (Nb) from 0.05% to 0.11% nitrogen (N2) less than 0.008% boron (B) and not more than the following residual percentages by mass: 0.020% sulfur, 0.020% phosphorous, 0.025% cobalt, 0.010% aluminum, 0.02% titanium, 0.02% tin, 0.10% copper, 0.015% tungsten, 0.020% arsenic, and 0.0025% antimony; the remainder of the alloy being iron; said steel having a nickel equivalent calculated using the formula: Ni eq=30C+0.5Mn+2Ni+25N2+40B, lying in the range 9 to 10.2; and a chromium equivalent calculated using the formula: Cr eq=Cr+2Si+1.5Mo+5V+1.75Nb lying in the range 14.5 to 15.5; the ratio between the chromium equivalent and the nickel equivalent lying in the range 1.49 to 1.65.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/78 (2006.01); C21D 6/00 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
C21D 1/78 (2013.01 - KR); C22C 38/48 (2013.01 - KR); C22C 38/54 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0164678 A1 19851218; EP 0164678 B1 19890419; AT E42347 T1 19890515; CS 274262 B2 19910411; CS 402885 A2 19900912; DE 3569576 D1 19890524; FR 2565251 A1 19851206; FR 2565251 B1 19871231; JP S61566 A 19860106; KR 860000400 A 19860128; KR 930003604 B1 19930508; US 4689095 A 19870825
DOCDB simple family (application)
EP 85106869 A 19850604; AT 85106869 T 19850604; CS 402885 A 19850605; DE 3569576 T 19850604; FR 8408785 A 19840605; JP 12138085 A 19850604; KR 850003921 A 19850605; US 74133485 A 19850605