(UNS S34700)

Availability | Specifications | Chemical Composition % Description | Design Features | Typical Applications | Tensile Requirements AVAILABILITY Seamless Pipe 1/2" - 12" Weld Pipe 8" - 12" Butt-Weld Flanges 1/2" - 8" SPECIFICATIONS ASTM A312, A403 ASME SA312, SA403 CHEMICAL COMPOSITION % C Co Cr Mn Ni P S Sl Ta MAX MAX MAX MAX MAX 0.08 Trace * 17.0-20.0 2.0 9.0-13.0 0.04 0.30 0.75 Trace* Chemical Composition Key * The columbium plus tantalum content shall not be less than 10 times the carbon and not more than 1.0% Note: 347H requires the columbium plus tantalum content to be not <8 times the carbon content and not> 1.0% DESCRIPTION These types of stainless are austenitic chromium steels containing columbium. They are recommended for parts fabricated by welding which cannot be subsequently annealed. These types also are used for parts which are intermittently heated and cooled to temperatures between 800o and 1600oF. The addition of columbium produces a stabilized type of stainless that eliminates carbide precipitation and, consequently, intergranular corrosion. TOP DESIGN FEATURES Superior general corrosion resistance over Type 321 due to stabilization with columbium. Reduced tendencies to form continuous networks of chromium carbides at the grain boundaries. Better high temperature properties than 304 or 304L. Generally used for parts which are intermittently up to heated up to 1500oF. For continuous service the maximum temperature is 1650oF. Type 347H has high carbon (.04-.10) for better high temperature creep properties. Improved intergranular corrosion resistance. TYPICAL APPLICATIONS High temperature chemical process heat exchanger tubes Refineries High temperature steam service TENSILE REQUIREMENTS Tensile Strength (KSI) 75 Yield Strength (KSI) 30 KSI can be converted to MPA (Megapascals) by multiplying by 6.89. MultAlloy stocks 347 with high carbon to meet 347/347H specifications. Select a Grade ------------------ A20 C276 2205 317/317L 310 321 347 200 400 600 625 800H/HP 825 410 316 304 TOP

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