UNS S44004 Stainless Steel

Description

UNS S44004 (440C) is the highest-carbon grade in the 440 series, offering the highest hardness, wear resistance, and polishability among the three variants. It can achieve hardness over 60 HRC after heat treatment and provides good corrosion resistance in mild environments. It is widely used in high-performance precision components and cutting tools.

Chemical Composition (wt%)

C: 0.95–1.20, Cr: 16.00–18.00, Mn ≤ 1.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030, Mo: 0.75–1.25

Mechanical Properties

Tensile Strength ≥ 960 MPa, Yield Strength ≥ 700 MPa, Elongation ≥ 6%, Hardness 58–62 HRC (heat-treated)

Advantages

Extreme hardness and wear resistance; excellent polishability; heat-treatable; magnetic.

Applications

High-precision bearings, cutting tools, surgical instruments, valve components, and high-wear parts.

Equivalent Grades

AISI 440C, EN 1.4122, GB 9Cr18

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.