German norm equivalency
German norm equivalency
(OP)
I'm looking for a American equivalent for the German (SEW) steel 30CrMoNiV5-11, used in steam turbines.
Could someone help me?
Could someone help me?
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RE: German norm equivalency
RE: German norm equivalency
DIN 1.6946
C 0.28-0.32
Si 0.30 max
Mn 0.15-0.40
P 0.015 max
S 0.018 max
Cr 1.2-1.8
Mo 0.25-0.45
Ni 2.4-3.1
V 0.05-.15
You absolutely need to review ASTM A470 and evaluate chemical composition and mechanical properties to replace the DIN rotor steel. Ni is too low in Class 8. Classes 5,6 or 7 are a closer chemical match to the DIN steel.
RE: German norm equivalency
RE: German norm equivalency
The composition that you listed for 1.6946 does not match what I found for 30CrMoNiV5-11. Stahlschlüssel 2001 shows the following composition for 30CrMoNiV5-11 (1.6946) from SEW 555:
C = 0.28-0.34
Si = 0.30 max
Mn = 0.30-0.80
P = 0.015 max
S = 0.018 max
Cr = 1.10-1.40
Mo = 1.00-1.20
Ni = 0.50-0.75
V = 0.25-0.35
RE: German norm equivalency
Very interesting because my source for the information was from an EPRI Report Volume 1, "Weld Repair of Steam Turbine Discs and Rotors" TR107021 V-1 3963 in my possesion. I suspect they cross referenced the HP rotor disc steel with an LP rotor disc steel in the Table. There is a reference to HP rotor steel as DIN 1.6946 30 NiCrMoV5 11, which is under low pressure disc material. EPRI lists 30 NiCrMoV 4 11 under LP rotor disc material and this would make better sense for the higher nickel content. Can you check on this?
RE: German norm equivalency
RE: German norm equivalency
RE: German norm equivalency