ASTM A403 WP347 Pipe Fittings | A403 WP347H Stainless Steel Elbow Tee

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ASTM A403 WP347 and WP347H pipe fittings are austenitic stainless steel butt weld fittings manufactured for use in high temperature and corrosion-resistant piping systems. These fittings are produced according to ASME B16.9 dimensional standards and are commonly used in industries such as petrochemical processing, power generation, refinery plants and high temperature pressure pipelines.

WP347 stainless steel fittings are stabilized with niobium (columbium), which improves resistance to intergranular corrosion and provides better performance at elevated temperatures. The high carbon modification WP347H is designed to provide improved creep strength and long-term stability in high temperature service.

Typical fittings manufactured from ASTM A403 WP347 / WP347H include butt weld elbows, tees, reducers and pipe caps, which are used in stainless steel piping systems requiring reliable strength and corrosion resistance.

UNS – S34700 / S34709

SS347 is a balanced, austenitic, chromium steel containing columbium which takes into consideration the end of carbide precipitation, and thus intergranular corrosion.

SS347 is balanced out by the increases of chromium and tantalum and offers higher creep and stress rupture properties than SS 304 and 304L, which may also be utilized for exposures where sensitization and intergranular corrosion are of concern.The expansion of columbium likewise permits SS347 to have outstanding corrosion resistance, better than that of SS 321. SS347H is the higher carbon composition form of SS 347and display enhanced high temperature and creep properties.

Corrosion Resistance

SS 347 stainless steel plate displays good general corrosion resistance that is similar to 304. It was produced for use in the chromium carbide precipitation scope by 800 – 1500°F (427 – 816°C) where unbalanced alloys such as SS304 are subject to intergranular attack. In this temperature scope, the overall corrosion resistance of Alloy 347 stainless steel plate is better than SS 321 stainless steel plate. SS347 additionally performs somewhat superior to SS321 in strongly oxidizing situations up to 1500°F (816°C). The alloy can be utilized as a part of nitric solutions; most diluted organic acids at moderate temperatures and in pure phosphoric acid at lower temperatures and up to 10% diluted solutions at high temperatures. SS347 stainless steel plate resists polythionic acid stress corrosion cracking in hydrocarbon service. It can also be used in chloride or fluoride free caustic solutions at moderate temperatures. SS347 stainless steel plate doesn’t perform well in chloride solutions, even in small concentrations, or in sulfuric acid.

ASTM A403 WP347 / WP347H Pipe Fittings Specification

ASTM A403 fittings are manufactured from stainless steel pipe or forgings and are supplied with full traceability and inspection documentation.

Common Types of ASTM A403 WP347 Fittings

Typical butt weld fittings manufactured from WP347 stainless steel include:

• ASTM A403 WP347 Elbow (45°, 90°, 180°)

• ASTM A403 WP347 Tee

• ASTM A403 WP347H Elbow

• ASTM A403 WP347H Tee

• Concentric Reducer

• Eccentric Reducer

• Pipe Cap

Chemical Composition %

A403 WP347H Pipe Fittings Chemical Composition

SS 347H Pipe Fittings Mechanical Properties

SS 347H Pipe Fittings Equivalent Grades