Low Alloy Steel ASTM A148 Gr 105-85

Designations: A148 105-85 · UNS D50850 · ISO 4990:2015ASTM A148 Grade 105-85 is the high-strength end of the low alloy cast steel range, specified where section size or weight is constrained and the casting has to carry the load anyway. It trades elongation for strength — 17% against the 22% of Grade 80-50 — and normally arrives quenched and tempered. Typical applications include lifting and rigging components, track shoes and heavy structural connections. Kormax casts A148 Gr 105-85 to order.

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Chemical Composition

Low Alloy Steel ASTM A148 Gr 105-85 — 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 105-85 — mechanical properties
Property	Metric	Imperial
Tensile Strength, min	725 MPa	105 ksi
Yield Strength, min	585 MPa	85 ksi
Elongation, min	17%	17%
Reduction of Area, min	35%	35%
Hardness (Brinell)	229–285 HB	229–285 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 105-85 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 105-85 / SAE 148 105-85
UNS: D50850
EN (EU/US): EN 10293 / EN 10283
BS (British Standard): BS 3100 A6
ISO (International): ISO 4990:2015