Cast Iron Class 40

Chemical Composition

Element Symbol Average Preferred Range %
Carbon C 3.1-3.4
Silicon Si 2.5-2.8
Manganese Mn 0.5-0.7
Phosphorus P 0.2
Chromium Cr 0.05-0.45
Nickel Ni 0.05-0.2
Molybdenum Mo 0.05-0.1
Sulfur S 0.07
Iron Fe Balance

Mechanical Properties

Property Metric Values Imperial Values
Tensile Strenght Min 40 ksi 276 MPa
Yield Strenght Min 20 ksi 140 MPa
Elongation Min % 2-3% 2-3%
Hardness (Brinell) 183HB 183HB

Comparative Specifications

ASTM / SAE: ASTM A48 Grade 40 / G9H12

DIN: GG25

Afnor: Ft25D

EN (EU/US): EN-GJL-250

BS (British Standard): Grade 250

GB (Chinese Standard) / ISO (International) / UNS: HT250 / 250 / F12801

Applicable Casting Processes