440A Stainless Steel Plate


440A stainless steel is a high-carbon martensitic stainless steel developed to provide stainless properties with maximum hardness. It is magnetic in both the annealed and hardened conditions. Maximum hardness and corrosion resistance are available only in the hardened or hardened and stress relieved conditions, so the alloy is not used in the annealed or annealed and tempered conditions. Dental and surgical instruments and cutlery are frequent applications for Type 440A.


Chemical Composition:


C: 0.95~1.20

Si: ≤1.00

Mn: ≤1.00

S: ≤0.030

P: ≤0.035

Cr: 16.00~18.00

Ni: ≤0.60


Mechanical Properties:


Tensile strength σb (MPa): quenched and tempered, ≥635

Conditional yield strength σ0.2 (MPa): quenched and tempered, ≥440

Elongation δ5 (%): quenching and tempering, ≥20

Reduction of area ψ (%): quenching and tempering, ≥50

Impact energy Akv (J): quenching and tempering, ≥63

Hardness: annealing, ≤223HB; quenching and tempering, ≥192HB

Related 400 Series Stainless Steel Bar Materials