Alloy Steel A148 GR 80-40

February 2, 2020

Alloy Steel A148 GR 80-40

ASMT A148 steel grade 80-40 [550-275] is one carbon steel material in casting purpose. Generally it’s low alloy carbon steel. Its UNS No. is D50400.

Reference casting standard:

ASTM A148 Standard Specification for Steel Castings, High Strength, for Structural Purposes

Grade 80-40 [550-275] Casting Chemical Requirements and Mechanical Property:
All steel grades in ASTM A48 require Sulfur and Phosphorus composition only:
Sulfur: 0.06 % max
Phosphorus: 0.05 % max

Other chemical composition such as Carbon, Manganese, Silicon and alloying elements, shall be selected by an agreement between the manufacture and the purchaser.

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ASTM A148 GradeChemistryTensile Strength minYield Point minElongation in 2in  (50mm)Reduction of Area minImpact Requirement Charpy V-notch energy value, ft-lbf[J]  −40°± 2°F
S %P %KsiMPaKsiMPa%%AverageSingle
80-40 [550-275]0.060.0580550402751830

Grade 80-40 [550-275] Casting Heat treatment process: generally all castings shall be heated treated either by full annealing, normalizing, normalizing and tempering, or quenching and tempering. To get the good mechanical property, generally 80-40 [550-275] need normalizing and tempering
ASTM A48 GR 80-40 Equivalent material steel grade in China casting industry:

GradeC %Si %Mn %P %S %TensileYieldElongation

Manufacture Process: Sand Casting, Precision Lost Wax Investment Casting.

ASTM A148 grade 80-40 [550-275] (UNS D50400) is Typically used in high strength purpose:

  • Building such as brige and subway
  • Oil Industry.
  • Weapon.
  • Low temperature condition.
  • Heat Exchanger System.

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