Chemical composition, mechanical properties of A890 grade 5A

A890 5A is a casting specification for duplex stainless steel. The A890 specification covers various grades of duplex stainless steel castings for use in corrosive environments and applications requiring high strength. 

Equivalent grades of A890 5A

ASTM: A890 5A

ASME: SA890 5A

25Cr-7Ni-Mo-N

ACI: CE3MN

AISI: 2507

SAF2507

UNS - Cast: J93404

UNS - Wrought: S32750

Chemical Composition:

The chemical composition of A890 5A typically includes the following elements:

Carbon (C): 0.03% maximum

Silicon (Si): 1.00% maximum

Manganese (Mn): 1.50% maximum

Phosphorus (P): 0.04% maximum

Sulfur (S): 0.03% maximum

Chromium (Cr): 24.0-26.0%

Nickel (Ni): 4.5-6.5%

Molybdenum (Mo): 2.0-3.0%

Nitrogen (N): 0.20-0.35%

Copper (Cu): 0.50% maximum

Mechanical Properties:

The mechanical properties of A890 5A are dependent on factors such as heat treatment and casting process. The following values are typical for A890 5A in the annealed condition:

Tensile Strength: 725-850 MPa (105-123 ksi)

Yield Strength: 485-550 MPa (70-80 ksi)

Elongation: 20% minimum

Hardness: 290 maximum (HBW or Brinell hardness)

Key features of A890 grade 5A

Superb resistance to stress corrosion cracking (sometimes referred to as SCC) in chloride-bearing environments.

Excellent resistance to crevice corrosion and pitting.

High resistance to general corrosion.

Good weldability

Physical properties which offer advantages in terms of design.

High resistance to erosion corrosion and corrosion fatigue.

Very high mechanical strength.