Low Alloy Steel ASTM A148 Gr 90-60

Designations: A148 90-60 · UNS D50600 · ISO 4990ASTM A148 Grade 90-60 is a low alloy cast steel used where a structural casting has to carry higher loads than Grade 80-50 will take, while still holding 20% elongation. The 620 MPa minimum tensile and 415 MPa minimum yield are the grade definition, not typical figures — a casting either meets them or is not Grade 90-60. It is specified for heavy machinery frames, gearbox housings, and mining and earthmoving components. Kormax casts A148 Gr 90-60 to order.

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Chemical Composition

Low Alloy Steel ASTM A148 Gr 90-60 — chemical composition, % by weight
Element	Symbol	Range / limit %
Carbon	C	0.20–0.30
Manganese	Mn	0.60–0.90
Silicon	Si	0.60 max
Nickel	Ni	0.40–0.80
Chromium	Cr	0.40–0.80
Molybdenum	Mo	0.15–0.30
Phosphorus	P	0.05 max
Sulfur	S	0.06 max
Iron	Fe	Balance

Kormax typical foundry practice, not a composition specified by ASTM A148. Chemistry may be adjusted to suit casting section size, heat treatment, hardenability and customer requirements. Where a drawing or purchase specification requires defined chemistry limits, state them at enquiry.

Mechanical Properties

Low Alloy Steel ASTM A148 Gr 90-60 — mechanical properties
Property	Metric	Imperial
Tensile Strength, min	620 MPa	90 ksi
Yield Strength, min	415 MPa	60 ksi
Elongation, min	20%	20%
Reduction of Area, min	40%	40%
Hardness (Brinell)	187–212 HB	187–212 HB

ASTM A148 specifies mechanical properties. Hardness is a typical value, not a requirement. Composition is Kormax’s own practice — A148 leaves chemistry to the producer.

Got the numbers you needed? Kormax pours A148 Gr 90-60 in chemically bonded sand, investment 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: A148 Gr 90-60 / SAE 148 90-60
UNS: D50600
DIN: DIN 1681 / DIN 1683
EN (EU/US): EN 10293 / EN 10213
BS (British Standard): BS 3100 A5
ISO (International): ISO 4990