公开(公告)号：DE19614407A1

公开(公告)日：1997-10-16

申请号：DE19614407

申请日：1996-04-12

Applicant: ABB RESEARCH LTD

Inventor： ERNST PETER DR ,  UGGOWITZER PETER J PROF DR ,  SPEIDEL MARKUS O PROF DR DR ,  STEINS REINER

IPC: C21D6/00 ,  C22C38/00 ,  C22C38/52 ,  C22C38/58 ,  C22C38/18 ,  C22C38/22 ,  C22C38/38 ,  C22C38/40 ,  C22C38/46

Abstract: This invention concerns a martensitic-austentitic steel consisting essentially (in wt%) of: 8 to 15 % chromium, 0.5 to 2.5 % molybdenum, up to 2 % tungsten, 4 to 10 % cobalt, 0.5 to 6 % nickel, 2.5 to 8 % manganese, 0.1 to 1.0 % vanadium, 0.05 to 0,25 % nitrogen, up to 0.2 % carbon, the rest being iron with impurities. This martensitic-austentitic steel can be used, in particular, as material for rotors or rotor disks in gas turbines operating at temperatures above 450 DEG C. The adjustment of the two phase martensitic-austentitic structure is done by heat treatment of the solution annealed and quenched steel structure in a temperature range between 550 DEG C and 650 DEG C.

公开(公告)号：DE19712020A1

公开(公告)日：1998-09-24

申请号：DE19712020

申请日：1997-03-21

Applicant: ABB RESEARCH LTD

Inventor： ERNST PETER DR ,  UGGOWITZER PETER J PROF DR ,  SPEIDEL MARKUS O PROF DR DR ,  GOECMEN ALKAN

IPC: C21D1/00 ,  C21D1/18 ,  C21D1/26 ,  C21D6/00 ,  C22C33/02 ,  C22C38/00 ,  C22C38/24 ,  C22C38/30 ,  C22C38/58 ,  C22C38/40

Abstract: A novel fully martensitic hardenable steel has the composition (by wt.) 8-15% Cr, up to 15% Co, up to 4% Mn, up to 4% Ni, up to 8% Mo, up to 6% W, 0.5-1.5% V, up to 0.15% Nb, up to 0.04% Ti, up to 0.4% Ta, up to 0.02% Zr, up to 0.02% Hf, NOTGREATER 50 ppm B, up to 0.1% C, 0.12-0.25% N, balance Fe and impurities, the sum of Mn + Ni being less than 4% and the sum of Mo + W being less than 8%. Also claimed is a heat treatment process for the above steel, comprising solution annealing at 1150-1250 degrees C for 0.5-15 hrs., cooling to room temperature and then tempering at 600-820 degrees C for 0.5-25 hrs.