UNS S31609 – High-Carbon Austenitic Steel For High-Temperature Creep Performance

Overview

UNS S31609 is a high-carbon austenitic stainless steel, engineered specifically for high-temperature applications that demand exceptional creep strength and oxidation resistance. With a carbon content of 0.04-0.10%, it delivers higher high-temperature mechanical stability compared to UNS S31600 and S31603, enabling continuous service at temperatures above 595°C. It retains the molybdenum (2.00-3.00%) addition for corrosion resistance and maintains a stable austenitic structure through 16.00-18.00% chromium and 10.00-14.00% nickel. This grade is non-magnetic, has good weldability with proper preheating, and is widely utilized in high-temperature industrial equipment where creep deformation is a key concern.

Chemical Composition (wt%)

C: 0.04-0.10, Cr: 16.00-18.00, Ni: 10.00-14.00, Mo: 2.00-3.00, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030, N ≤ 0.10

Typical Mechanical Properties (Annealed Condition)

Tensile Strength (Rm): ≥ 520 MPa; Yield Strength (Rp0.2): ≥ 205 MPa; Elongation (A): ≥ 35%; Brinell Hardness (HB): ≤ 201

Core Advantages

High carbon content enhances high-temperature creep strength and dimensional stability; excellent oxidation resistance at elevated temperatures (up to 700°C continuous service); molybdenum ensures corrosion resistance in chloride environments; non-magnetic; good weldability with preheating; suitable for high-temperature pressure vessels and heat-resistant components.

Applications

High-temperature boilers, industrial heat exchangers, steam turbines, petrochemical cracking equipment, nuclear power plant components, and high-temperature piping systems requiring creep resistance and corrosion protection.

Equivalent Grades

EN 1.4406, STS316H, GB 07Cr17Ni12Mo2, AISI 316H, 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.