UNS S31609 Stainless Steel – High-Temp Chloride-Resistant Heavy-Duty Alloy

Product Overview

UNS S31609 is the high-carbon variant of S31600, combining the chloride corrosion resistance of 316 with elevated high-temperature strength. With a carbon range of 0.04-0.10%, it delivers improved creep resistance and mechanical stability at temperatures above 500°C, making it suitable for high-heat, corrosive environments where standard 316 and 316L lack strength. This grade retains the molybdenum alloying for chloride protection, remaining non-magnetic and weldable. It is tailored for petrochemical and power generation applications that demand both heat resistance and corrosion durability.

Chemical Composition (Mass Fraction, %)

C: 0.04-0.10, Cr: 16.00-18.50, Ni: 10.00-14.00, Mo: 2.00-3.00, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030, N ≤ 0.11

Mechanical Properties (Annealed Condition)

Tensile Strength ≥ 520 MPa; Yield Strength ≥ 205 MPa; Elongation ≥ 40%; Hardness ≤ 215 HB

Core Advantages

Balanced high-temperature creep strength and chloride corrosion resistance; excellent oxidation resistance in harsh heat environments; non-magnetic; reliable weldability; suitable for pressure-retaining high-heat components.

Typical Applications

High-temperature chemical reactors, boiler superheaters, petrochemical piping, heat exchangers, and power generation equipment in corrosive thermal settings.

Equivalent Grades

AISI 316H, EN 1.4406, GB 07Cr17Ni12Mo2, SUS316H

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.