UNS S44000 Martensitic Stainless Steel – High-Wear High-Corrosion Alloy

Description

UNS S44000 is a high-carbon martensitic stainless steel series, renowned for its exceptional hardness, wear resistance, and moderate corrosion protection. It is available in three sub-variants (S44002, S44003, S44004) with varying carbon contents, all containing 16.0-18.0% chromium and 0.75-1.25% molybdenum to enhance pitting resistance. Its martensitic structure ensures magnetic properties, and it requires heat treatment (quenching and tempering) to achieve its full mechanical potential, with hardness increasing with carbon content. Unlike lower-carbon martensitic grades like S42000, S44000 offers superior wear resistance but has limited formability and weldability due to its high carbon content. It is ideal for high-performance applications where wear resistance is the primary requirement, even if processability is secondary.

Chemical Composition (wt%)

C: 0.60-1.20 (S44002: 0.60-0.75; S44003: 0.75-0.95; S44004: 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, Ni ≤ 0.75

Mechanical Properties

Tensile Strength ≥ 760 MPa, Yield Strength ≥ 550 MPa, Elongation ≥ 10%, Hardness ≤ 269 HB (annealed); Tensile Strength ≥ 1380 MPa, Yield Strength ≥ 1100 MPa, Elongation ≥ 5%, Hardness ≥ 58 HRC (heat-treated, S44004)

Advantages

Exceptional hardness and wear resistance; molybdenum-enhanced pitting resistance; magnetic; heat-treatable to extreme hardness; good corrosion resistance in mild environments; ideal for high-wear applications.

Applications

Bearings, cutting tools, knives, blades, valves, gears, surgical instruments, and high-performance components requiring superior wear resistance.

Equivalent Grades

AISI 440 (440A/440B/440C), EN 1.4116 (440A), 1.4125 (440B), 1.4122 (440C), GB 7Cr17/8Cr17/9Cr18

 

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.