309S(Cr-Ni)

1. Introduce

– Stainless steel developed for use in high temperature corrosion resistant applications

– Material with reduced carbon content to minimize carbides for improved weldability

– Excellent heat and oxidation resistance up to 1038℃ temperature range and can be used in sulfuric atmosphere

– Higher Cr and Ni additions provide better corrosion resistance than 304 and similar high temperature strength to 18-8 stainless steel

– UNS S30908

* 309 Stainless Steel Types : Related to Carbon Content

: All 309 series are heat resistant steels characterized by good oxidation resistance up to 1038°C temperature range

: Chemical composition, mechanical properties, and physical properties are the same except for the amount of carbon

: Higher carbon content improves creep strength and lower carbon content improves weldability

– 309S : Carbon content 0.08% Maximum

– 309 : Carbon content 0.20% Maximum

– 309H : Carbon content 0.04~0.10% Maximum

* UNS

1. Abbreviation for the Unified Numbering System for Metals and Alloys
2. Unified unique numbering system for metals and alloys
3. A representative number compatible with metals and alloys defined in several material-related codes, including ASTM, AISI, ASME, AWS, etc.

* S : Heat and corrosion resistant (stainless) steel

2. Property

– Corrosion resistance, heat resistance, oxidation resistance, sulfidation resistance, high tensile strength and creep strength, good weldability

[309S Chemical Composition (%)]

[309S Mechanical Properties]

[309S Physical Properties]

3. Standard & Specification

– Specification : UNS S30908

4. Available Form

– Bar, Rod

– Tube, Pipe

– Wire, Coil

– Plate, Sheet, Strip

– Fittings, Flanges

5. Application & Product

– Chemical, Petroleum, Power Generation, Aerospace, Automotive

(1) Incinerator / (2) Catalyst recovery filter / (3) Tube hanger / (4) Aircraft parts