S31277 Stainless Steel Bar

Product Description

S31277 is a super austenitic stainless steel bar characterized by high chromium (25-27%), nickel (30-32%), and molybdenum (6-7%) content with nitrogen enhancement. This premium-grade steel delivers exceptional corrosion resistance in chloride-rich environments, making it ideal for offshore, chemical processing, and desalination industries.

Applications

As round bars, S31277 is extensively used in critical components including subsea valve stems, seawater pump shafts, and heat exchanger fasteners. Its bar form enables precision machining for high-stress marine hardware requiring both mechanical strength and pitting resistance.

Chemical Composition

The optimized composition includes chromium (25-27%) for oxidation resistance, nickel (30-32%) for ductility, molybdenum (6-7%) for crevice corrosion resistance, and controlled nitrogen (0.4-0.5%) for stabilized austenitic structure. Copper (0.8-1.2%) further enhances acid resistance.

Mechanical Properties

Cold-worked S31277 bars demonstrate:
- Tensile strength: 750-900 MPa
- Yield strength: 400 MPa (min)
- Hardness: 28-32 HRC
- Elongation: 40% (typical)

Production Dimensions

Available in diameters ranging from 10mm to 500mm, with standard lengths of 3-6 meters. Custom-cut lengths up to 12 meters can be supplied for large-scale marine projects.

Why Choose FUSHUN METAL

Our vertically integrated production ensures strict control over S31277 bar metallurgy - from vacuum induction melting to precision rotary forging. With DNV-GL and NACE MR0175 certifications, we guarantee bars with ≤10μm surface roughness and ±0.1mm dimensional tolerance.

Contact our technical team to discuss your project specifications or request material test reports.