347 Stainless Steel
(UNS S34700 | EN 1.4550)
Overview:
Similar to 321 but stabilized with niobium (columbium). Great for prolonged exposure to heat and oxidizing environments.
Used In:
Refineries, heat exchangers, boilers, power generation, and exhaust systems.
Technical Snapshot:
C ≤0.15 | Mn 5.5–7.5 | Cr 16–18 | Ni 3.5–5.5 | N ≤0.25 UTS 90–110 ksi | YS 40–50 ksi | El. 40–45% | HRB 85–95
Available Forms: Coil, strip, sheet, foil, and bar.
Standards: ASTM A240; AMS 5512, AMS 5646
347 stainless steel from Source21 is a niobium stabilized austenitic stainless steel grade designed for sustained performance in high temperature and oxidizing environments. Similar to Type 321 but stabilized with niobium also known as columbium Type 347 stainless steel resists carbide precipitation during prolonged heat exposure preserving corrosion resistance and mechanical strength in welded and fabricated components. It is widely used in refineries heat exchangers boilers power generation equipment and exhaust systems where thermal stability and reliability are essential. Source21 supplies 347 stainless steel in coil, strip, sheet, foil, and bar, all produced to meet ASTM A240, AMS 5512, and AMS 5646 standards. Contact the Source21 team to place an order explore material availability or receive expert guidance for high temperature stainless steel applications supported by reliable supply and responsive service.