Stainless Steel 440A is a high-carbon martensitic stainless steel offering excellent hardness, good wear resistance, and better corrosion resistance than 440B and 440C. With moderate carbon content and high chromium levels, SS 440A provides a strong balance between strength, toughness, and corrosion protection after heat treatment. It maintains good edge retention while being easier to polish and maintain in mildly corrosive environments. Grade 440A is widely used in surgical instruments, food processing equipment, bearings, pump components, knives, and precision mechanical parts where durability and hygiene are important.
CHEMICAL COMPOSITION OF STAINLESS STEEL 440A ROUND BAR
Grade
C %
Mn %
Si %
P %
S %
Cr %
Ni %
440A
0.65 – 0.75
1.00 max
1.00 max
0.040 max
0.030 max
16.0 – 18.0
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MECHANICAL PROPERTIES OF STAINLESS STEEL 440A ROUND BAR
Condition
Tensile Strength (MPa)
Yield Strength 0.2% (MPa)
Elongation (%)
Hardness (HRC)
Impact Charpy V (J)
Annealed
758
448
14
≤ 26 HRC
—
204°C
2030
1900
4
59
9
260°C
1960
1830
4
57
9
316°C
1860
1740
4
56
9
371°C
1790
1660
4
56
9
PHYSICAL PROPERTIES OF STAINLESS STEEL 440A ROUND BAR
Property
Value
Unit
Density
7.75
g/cm³
Thermal Conductivity
24.2
W/m·K
Specific Heat
460
J/kg·K
Modulus of Elasticity
200
GPa
Melting Range
1480 – 1530
°C
💡 Practical Difference in Use
Use Stainless Steel 440A Round Bars when: good hardness, excellent corrosion resistance among the 440 series, reliable wear resistance, and easy maintenance are required. SS 440A is a high-carbon martensitic stainless steel with slightly lower carbon content than 440B and 440C, providing better corrosion resistance and toughness while still achieving high strength after heat treatment. It is suitable for applications where durability, hygiene, and moderate cutting or sliding wear performance are important.
→ Example: food processing components, surgical instruments, bearings, pump parts, valve components, knives, shafts, and precision mechanical parts.
Heat Treated / Bright Finished Stainless Steel 440A Round Bars when: consistent surface finish, dimensional stability, improved hardness, and smooth machining characteristics are required for precision components. Bright drawn or ground bars ensure tight tolerances and improved surface quality, while heat treatment enhances wear resistance and edge retention.
→ Example: medical tools, polished shafts, CNC machined parts, bearing sleeves, precision fasteners, cutting tools, and hygienic equipment components.
Applications of Stainless Steel 440A Round Bars
Stainless Steel 440A round bars are widely used in medical, food processing, mechanical engineering, pump manufacturing, and precision equipment industries where corrosion resistance, cleanliness, and dependable hardness are required.
Medical & Surgical: Surgical instruments, dental tools, precision medical equipment.
