Alloy 304/304H (UNS S30400/ S30409)is a modification of the most widely utilized "18-8" chromium-nickel austenitic stainless steel. The carbon content is controlled in the range of 0.04-0.10% for increased strength at temperatures above 800°F (427°C). It is an economical and versatile corrosion resistant alloy suitable for a wide range of general purpose applications. It is common practice for 304H to be dual certified as 304 and 304H. The high carbon chemistry of 304H enables 304 to meet the mechanical properties and grain size requirements of 304H. Alloy 304/304Hhas general corrosion resistance similar to 304/304L. It resists atmospheric corrosion, as well as, moderately oxidizing and reducing environments. However, because of its high carbon content, Alloy 304/304H is subject to carbide precipitation in the heat affected zone of welds. Alloy 304/304H is non-magnetic in the annealed condition, but can become slightly magnetic as a result of cold working or welding. It can be easily welded and processed by standard shop fabrication practices. STANDARDS INDUSTEEL TRADEMARKS UNS ASTM EURONORMS EN SUS 304H/304 S30400/S30409 304(H) 1.4301/1.4948 X5CrNi18-10 SUS 304 CHEMICAL ANALYSIS (%WEIGHT) C Cr Ni Mo N Others ≥ 0,040 18 8 - - PROPERTIES 0,2 Y.S. - Rp 0,2min ASTM / EN 0,2 Y.S. - Rp 0,2(2)typical value UTS - Rm min ASTM / EN UTS - Rm(2)typical value EI-A(1)% PREN(4) HOMOLOGATIONS MPa Ksi MPa Ksi MPa Ksi MPa Ksi Last revised -210 30 305 44 520 75 590 86 45 19