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GG25 / EN-GJL-250

Home Materials GG25 / EN-GJL-250

Characteristics of GG25

GG25 is the most commonly used cast iron alloy. This material offers a good combination of strength and abrasion resistance, but is still easy to machine and can be finished to a high standard. It is a lamellar cast iron with a predominantly pearlitic structure. Heat treatment to increase hardness is not recommended.

GG25 is similar to GG20, but – due to the slightly finer structure – offers a higher tensile strength. This makes it suitable for machine components that are subjected to higher mechanical stresses.

Standards / designations
EN 1561 SYM (EU) EN-GJL-250

EN 1561 NR (EU) EN-JL1040

DIN 1691 (DE) GG25


ASTM A48 (US) 40 B

ALT GG 25, GG-25
Mechanical properties
Tensile strength σ B 250 [N/mm2]

Elongation A 0.3-0.8 [%]

Permanent limit of elongation σ bB 450 [N/mm2]

Compressive Strength σ dB 950 [N/mm2]

Brinell hardness HB30 180-240 [Kg/mm2]

Elasticity modulus Eo 110 [kN/mm2]

Shear stress σaB 290 [N/mm2]
Chemical composition
Carbon C 2.9-3.65 [%]

Silicon Si 1.8-2.9 [%]

Manganese Mn 0.5-0.7 [%]

Sulphur S 0.10 max. [%]

Phosphorus P 0.30 max. [%]

Iron Fe Remainder