SUS309: Furnace Parts and Complete Designations

SUS309 is a heat-resistant austenitic stainless designation; confirm whether the specification actually calls for 309 or 309S. Material reference.

Furnace Parts and Complete Designations

For a furnace component, define the atmosphere, peak and normal temperatures and thermal cycling. Do not select a grade only by an advertised maximum temperature: load, oxidation, creep and attachment details can impose different limits.

Manufacturing and acceptance checks

Include the complete suffix, product form and thickness in the RFQ. Ask for a review of welds, supports and differential expansion. Compare SUS310 using the same atmosphere and life target, and agree which deformation or surface deterioration ends the component's acceptable service.

Compare related options

• SUS310
• SUS321

Reference and scope

Outokumpu: selecting high-temperature stainless grades provides material or specification background. The checks above are purchasing guidance; final acceptance values must come from the agreed grade, product specification and condition.

Send a drawing and material requirements for review. Include quantity, critical dimensions and the inspection evidence required with delivery.