Global Patent Index - EP 1008659 B1

EP 1008659 B1 20030625 - Use of a maraging steel as an armour plate

Title (en)

Use of a maraging steel as an armour plate

Title (de)

Verwendung eines martensitaushärtenden Stahles in Form eines Panzerungsbleches

Title (fr)

Utilisation d'acier maraging comme tôle de blindage

Publication

EP 1008659 B1 20030625 (DE)

Application

EP 99123069 A 19991120

Priority

DE 19857156 A 19981211

Abstract (en)

[origin: EP1008659A1] Maraging steel sheet production comprises surface hardening of the maraged sheet at below the martensite to austenite transformation temperature. Production of a sheet of a maraging steel, especially of composition ≤ 0.03% C, ≤ 0.1% Si, ≤ 0.1% Mn, ≤ 0.01% P, ≤ 0.01% S, 0.05-0.15% Al, 17.0-19.0% Ni, 7.0-16.0% Co, 4.0-6.5% Mo, 0.5-2% Ti, optionally one or more of ≤ 0.5% Cr, ≤ 0.5% Cu, ≤ 0.2% Nb, ≤ 0.2% V, ≤ 0.2% Zr and ≤ 0.2% W, balance Fe and impurities, comprises age hardening by heating the sheet, especially after cutting and shaping, to a temperature below the martensite to austenite transformation temperature, the sheet then being additionally surface hardened at below the martensite to austenite transformation temperature. Preferred Features: Surface hardening is carried out by plasma nitriding, hard chromium plating or coating with a hard material.

IPC 1-7

C21D 6/00; C21D 6/02; C21D 1/06; C23C 14/02; C23C 16/02; C23C 8/28; C22C 38/10; C22C 38/12; C22C 38/14

IPC 8 full level

C21D 1/06 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C22C 38/10 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C23C 4/02 (2006.01); C23C 8/02 (2006.01); C23C 8/28 (2006.01); C23C 14/02 (2006.01); C23C 16/02 (2006.01)

CPC (source: EP)

C21D 6/001 (2013.01); C21D 6/007 (2013.01); C22C 38/105 (2013.01); C22C 38/14 (2013.01); C23C 4/02 (2013.01); C23C 8/02 (2013.01); C21D 6/02 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

EP 1008659 A1 20000614; EP 1008659 B1 20030625; AT E243768 T1 20030715; DE 19857156 A1 20000621; DE 19857156 B4 20050324; DE 59906082 D1 20030731; ES 2202992 T3 20040401

DOCDB simple family (application)

EP 99123069 A 19991120; AT 99123069 T 19991120; DE 19857156 A 19981211; DE 59906082 T 19991120; ES 99123069 T 19991120