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Grey Cast iron ; general motors standard GM274M

Grey Cast iron ; general motors standard GM274M

Grey Cast iron ; general motors standard GM274M

(OP)
Does anyone has a this standard and could tell me what DIN-quality this is comparable with?

RE: Grey Cast iron ; general motors standard GM274M

GM274M is a standard which covers a range of grades, firstly general purpose grades where Minimum Tensile can range from 125MPa to 250MPa.  Followed by special purpose grades for Disc Rotors, Pump Bodies, Bearing Caps, Piston Rings and Cylinder Liners.
For the general pupose grades, the equivalent standards are:

G125    ASTM A159 G1800 or SAE J431
G150    ISO 185 150
G200    ISO 185 200
G205    ASTM A159 G3000 or SAE J431
G240    ASTM A159 G3500 or SAE J431
G250    ISO 185 250

Hope this helps
James



RE: Grey Cast iron ; general motors standard GM274M

(OP)
The drawing I had specified a grade G275SP-1.

So I'll check the ISO 185 standard.

RE: Grey Cast iron ; general motors standard GM274M

G275SP-1 is a Pearlitic Matrix Grey Iron with Minimum Tensile Strength of 275MPa.  Hardness Range is 187 - 285 HB.
Typical Composition:
    C    3.15 - 3.55
   Si    2.15 - 2.55
   Mn    0.50 - 0.60
   Cu    0.25 max
    S    0.16 max
    P    0.10 max
   Cr    0.25 max
   Mo    0.40 - 0.60

James
p:61 (8) 8344 0123
f:61 (8) 8344 0100

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