Alloy 347 and 347H is a kind of high carbon Niobium Stabilized Austenitic stainless steel with the addition of Niobium. The addition of element Nb, making TP347H has a good intercrystalline corrosion resistance, especially to corrosive media such as acid, alkali and salt. It is widely used in heat exchanger, superheater pipe, reheater pipe, steam pipe in boiler of power generation, petroleum, chemical industry, synthetic fiber, food and paper industry. The element Nb is less vulnerable to burning loss than Ti, so it can be used as the welding rod for Cr-Ni Austenitic stainless steel. Similar to 18-8 Austenitic stainless steel which containing Ti, Grade 347H has higher high temperature strength and better oxidation resistance than 316 stainless steel.
Stainless steel 347/347H equivalent grade：
UNS S34700/ S34709
GB 0Cr18Ni11Nb/ 1Cr19Ni11Nb
Available Forms and Specifications:
Grade 347H steel pipe & tube: ASTM A 213, A312, A 269; AMS 5556, 5558, 5575, 5571
Grade347H sheet & plate: ASTM A240; AMS 5512
Grade 347H round bar: ASTM A 276, A479
Grade 347H forging: ASTM A182
Type 347H Mechanical Properties:
Tensile strength, min, Mpa
Yield strength, 0.2% offset, min, Mpa
Alloy 347 and 347H is generally used where require severe corrosive conditions such as superheater pipe, reheater pipe, steam pipe for large boiler and heat exchanger, oil refineries for petrochemical processing.
LKALLOY is an industry leading supplier of Cr-Ni series and other high-quality stainless steel alloys. LKALLOY supply 347H stainless steel pipe and tube, 347 filler rod which used for several applications such as condensers, heat exchangers, filters and so on.
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