Gray Cast Iron Class 35 (ASTM A48)

Designations: A48 Class 35 · UNS F12401ASTM A48 Class 35 is a gray cast iron specified where a component needs more strength than the lower classes without losing the qualities gray iron is chosen for — vibration damping, machinability and dimensional stability. The class number is the minimum tensile strength in ksi, so Class 35 means 35 ksi. It suits machine bases, housings, cylinder blocks and hydraulic bodies. Kormax casts A48 Class 35 to order.

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Chemical Composition

Gray Cast Iron Class 35 — chemical composition, % by weight
Element	Symbol	Range / limit %
Carbon	C	2.9–3.2
Silicon	Si	1.1–1.7
Manganese	Mn	0.8–1.2
Phosphorus	P	0.15 max
Chromium	Cr	0.05–0.45
Nickel	Ni	0.05–0.10
Molybdenum	Mo	0.10 max
Sulfur	S	0.12 max
Copper	Cu	0.15–0.40
Iron	Fe	Balance

ASTM A48 specifies mechanical properties only. This is Kormax’s typical foundry composition.

Mechanical Properties

Gray Cast Iron Class 35 — mechanical properties
Property	Metric	Imperial
Tensile Strength, min	241 MPa	35 ksi
Hardness (Brinell)	210–260 HB	210–260 HB

Hardness is a typical value. ASTM A48 specifies tensile strength only.

Got the numbers you needed? Kormax pours A48 Class 35 in chemically bonded sand, green sand and shell mold casting.

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Comparable and Related Specifications

The standards and grades below may have similar composition, properties or applications, but they should not be treated as direct equivalents without review. Chemistry, heat treatment, toughness requirements and testing provisions can differ between standards.

ASTM / SAE: ASTM A48 Class 35
UNS: F12401
Afnor: Ft25D
EN (EU/US): EN-GJL-250
DIN: GG25
BS (British Standard): Grade 250
GB (Chinese Standard): HT250