Global Patent Index - EP 1008659 A1

EP 1008659 A1 2000-06-14 - Process for producing a maraging steel sheet

Title (en)

Process for producing a maraging steel sheet

Title (de)

Verfahren zur Herstellung eines Bleches aus martensitaushärtendem Stahl

Title (fr)

Procédé pour la fabrication d'une tôle d'acier maraging

Publication

EP 1008659 A1 (DE)

Application

EP 99123069 A

Priority

DE 19857156 A

Abstract (en)

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.

Abstract (de)

Ein Verfahren zum Herstellen eines Bleches aus, martensitaushärtendem Stahl, insbesondere der Zusammensetzung <= 0,03% C, <= 0,1% Si, <= 0,1% Mn, <= 0,01% P, <= 0,01% S, 0,05 bis 0,15% Al, 17,0 bis 19,0% Ni, 7,0 bis 16,0% Co, 4,0 bis 6,5% Mo und 0,5 bis 2% Ti, ggf. ferner <= 0,5% Cr, <= 0,5% Cu, <= 0,2% Nb, <= 0,2% V, <= 0,2% Zr und/oder <= 0,2% W, Rest Fe und verfahrensbedingte Verunreinigungen, bei dem das Blech, insbesondere nach dem Ausschneiden und ggf. sonstigen Formen des Zuschnitts, durch Erwärmen auf eine Temperatur unter der Umwandlungstemperatur Martensit Austenit ausgehärtet wird, ist dadurch gekennzeichnet, daß anschließend zusätzlich eine Oberflächenhärtung vorgenommen wird unter Anwendung einer Temperatur, die gleichfalls unter der Umwandlungstemperatur Martensit Austenit liegt. Die Oberflächenhärtung kann eine chemisch-thermische Randschichtbehandlung sein. Bevorzugt wird eine Plasmanitrierung. Weiter sind eine Hartverchromung oder eine Beschichtung mit einem sonstigen Hartstoff, vorzugsweise durch Plasma- oder Flammspritzen, PVD oder CVD, vorgeschlagen. Das Verfahren kann auch auf die äußere Lage eines Verbundstahles angewandt werden.

IPC 1-7 (main, further and additional classification)

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

IPC 8 full level (invention and additional information)

C21D 6/00 (2006.01); C22C 38/10 (2006.01); C22C 38/14 (2006.01); C23C 4/02 (2006.01); C23C 8/02 (2006.01); C21D 6/02 (2006.01)

CPC (invention and additional information)

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)

Citation (search report)

Designated contracting state (EPC)

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

EPO simple patent family

EP 1008659 A1 20000614; EP 1008659 B1 20030625; AT 243768 T 20030715; DE 19857156 A1 20000621; DE 19857156 B4 20050324; ES 2202992 T3 20040401

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2002-12-18 [RTI1] TITLE (CORRECTION)

- Free text: USE OF A MARAGING STEEL AS AN ARMOUR PLATE

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