Low Alloy Steel ASTM A148 Gr 80-50

Designations: A148 80-50 · UNS D50500 · ISO 4990ASTM A148 Grade 80-50 is a low alloy cast steel specified where a structural casting has to be strong without giving up ductility or weldability. Its 22% minimum elongation is the highest of the commonly specified A148 grades, which suits fabricated assemblies and parts that will be welded into a structure. Kormax casts A148 Gr 80-50 to order.

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Chemical Composition

Low Alloy Steel ASTM A148 Gr 80-50 — chemical composition, % by weight
Element	Symbol	Range / limit %
Carbon	C	0.25 max
Manganese	Mn	1.25–1.45
Silicon	Si	0.60 max
Chromium	Cr	0.70–0.90
Nickel	Ni	0.25–0.40
Molybdenum	Mo	0.15–0.25
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 80-50 — mechanical properties
Property	Metric	Imperial
Tensile Strength, min	550 MPa	80 ksi
Yield Strength, min	345 MPa	50 ksi
Elongation, min	22%	22%
Reduction of Area, min	35%	35%
Hardness (Brinell)	170–197 HB	170–197 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 80-50 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 80-50 / SAE 148 80-50
UNS: D50500
DIN: GS60
EN (EU/US): 1.0591 GE320
BS (British Standard): BS 3100 A4
GB (Chinese Standard): ZG 310-570
ISO (International): ISO 4990