High Quality SS 440A Round Bars & Rods

Mechanical Strength • Accuracy & Straightness • Quality & Finish

Get a Quote

Stainless Steel 440A Explained

Stainless Steel 440A is a high-carbon martensitic stainless steel. To begin with, it offers an excellent balance of hardness, good wear resistance, and superior corrosion resistance compared to 440B and 440C. Furthermore, its moderate carbon content combined with high chromium levels ensures strong mechanical properties while maintaining reliable corrosion protection.

Why do manufacturers and engineers prefer SS 440A for critical applications? First and foremost, it provides a strong balance between strength, toughness, and corrosion resistance after heat treatment. In addition, it maintains good edge retention while being easier to polish and maintain — making it ideal for hygiene-sensitive environments. Moreover, its higher chromium content delivers better corrosion resistance than the higher-carbon 440 variants.

Consequently, Stainless Steel 440A is widely used in surgical instruments, food processing equipment, and bearings. Furthermore, it is also trusted in pump components, knives, and precision mechanical parts. Equally important, its combination of durability, hygiene, and ease of maintenance makes it the preferred choice for applications where cleanliness and long-term reliability are essential.

Need high-quality SS 440A round bars for your precision or hygiene-critical application? Contact our technical team today — we’ll help you select the right size, heat treatment condition, and finish for your specific requirements, and provide a competitive quote tailored to your needs.

Other Types of Stainless Steel 440A Bars

SS 440A Stainless Steel Square Bar
View SS 440A Square Bar
SS 440A Square Bar
  • High hardness SS 440A square bars for wear-resistant applications
  • Material designation: UNS S44002 martensitic stainless steel
  • Manufactured as per ASTM A276 / ASME SA276 standards
  • DIN 1.4109 grade ensures dimensional accuracy and strength
SS 440A Stainless Steel Hex Bar
View SS 440A Hex Bar
SS 440A Hex Bar
  • Precision-machined SS 440A hex bars for tooling and fasteners
  • Produced under ASTM A276 stainless steel specifications
  • Grade compliant with DIN 1.4109 and UNS S44002
  • Available in bright drawn, polished and centerless ground finish
SS 440A Stainless Steel Rectangular Bar
View SS 440A Rectangular Bar
SS 440A Rectangular Bar
  • ASTM A276 certified SS 440A rectangular profiles
  • Enhanced edge retention and surface stability
  • DIN 1.4109 / UNS S44002 grade material consistency
  • Suitable for precision components and industrial assemblies
SS 440A Stainless Steel Flat Bar
View SS 440A Flat Bar
SS 440A Flat Bar
  • SS 440A flat bars engineered for cutting tools and wear parts
  • UNS S44002 stainless steel composition
  • Produced in compliance with ASTM A276 / ASME SA276
  • Offered in hot rolled, ground and polished surface finish
SS 440A Stainless Steel Bright Bar
View SS 440A Bright Bar
SS 440A Bright Bar
  • Bright finished SS 440A bars with tight dimensional tolerance
  • Smooth surface suitable for high-speed machining
  • ASTM A276 manufacturing standard compliance
  • Excellent straightness and uniform mechanical performance
SS 440A Stainless Steel Forged Bar
View SS 440A Forged Bar
SS 440A Forged Bar
  • Forged SS 440A bars for high-load mechanical applications
  • Heat treated for superior hardness and fatigue resistance
  • UNS S44002 stainless steel forged material
  • Widely used in valve parts, bearings and precision machinery

440A STAINLESS STEEL ROUND BAR EQUIVALENT GRADES

STANDARD UNS WNR.
SS 440A S44002 1.4109

SPECIFICATION OF STAINLESS STEEL 440A ROUND BAR

Standard ASTM A276 / A479, ASME SA276 / SA479
Dimension Standard EN, DIN, JIS, ASTM, BS, ASME, AISI
Size 14 mm – 300 mm
Length 50 mm to 6000 mm, Custom Cut Length
Form Round, Square, Hex (AF), Rectangle, Billet, Ingot, Forged

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 —

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.
  • Food Processing: Blades, shafts, pump components, hygienic machine parts.
  • Industrial Machinery: Bearings, valve parts, shafts, wear-resistant components.

When to Choose Stainless Steel 440A Round Bars?

The selection mainly depends on corrosion exposure, hygiene requirements, moderate wear performance, polishing needs, and dimensional precision.

Choose SS 440A Round Bars when:

  • Higher corrosion resistance than 440B and 440C is required
  • Moderate to high hardness is sufficient
  • Cleanliness and easy surface maintenance are important
  • Components operate in mildly corrosive environments
  • Good toughness and polishability are needed
  • Used in food, medical, and light industrial equipment

SS 440A Bright / Ground / Heat Treated Round Bars are preferred when:

  • Fine surface finish and tight tolerances are required
  • Precision machining and CNC production are involved
  • Improved wear resistance is necessary
  • Polished appearance is important for visible parts
  • Stable dimensional accuracy is critical
  • Used in surgical, food-grade, and precision assemblies

Industries That Use Stainless Steel 440A Round Bars

SS 440A is preferred in industries where corrosion resistance, hygiene, controlled hardness, and smooth surface finish are critical.

Medical & Healthcare Industry

Used in sterile and precision instruments.

Uses

Surgical tools, dental instruments, medical shafts.

Why SS 440A?

Corrosion resistance and polishability.

Food Processing Industry

Used in hygienic processing equipment.

Uses

Blades, pump shafts, mixer parts.

Why SS 440A?

Clean surface with corrosion protection.

Precision Engineering

Used in accurate mechanical assemblies.

Uses

Bearing sleeves, shafts, machined components.

Why SS 440A?

Dimensional stability and smooth finish.

Pump & Valve Manufacturing

Used in fluid handling components.

Uses

Valve stems, pump shafts, seals.

Why SS 440A?

Wear resistance with corrosion protection.

Cutlery & Tools

Used in cutting and edge tools.

Uses

Knives, blades, precision cutters.

Why SS 440A?

Balanced hardness and corrosion resistance.

Request a Quote

Contact Us