Pipe Fittings

Pipe Fittings


Pipe fittings are piping components that help in pipe routing for directional changes, size changes and branch connections. They are made up of different materials like carbon steel, stainless steel, copper, iron, brass, PVC etc. Different pipe fittings serve different functions as per layout or process requirements. Common types of pipe fittings are piping elbows, piping reducers, tee connectors, olet connectors, unions, couplings, nipples, valves, flanges, adaptors, caps, plugs, bushings, crosses, etc and widely used in both the piping and plumbing industry.


Uses of pipe fittings include manufacturing, chemical, oil and gas, semiconductor, municipal, food industry, sanitation, construction, agriculture, energy and marine applications.


Two of the most utilized grades of pipe fittings are ASTM A234 and ASTM A403. ASTM A234 is the standard specification for pipe fittings of wrought carbon steel and alloy steel for moderate and high-temperature service. It covers steel fittings of seamless and welded types. There are two carbon steel grades: WPB and WPC, of which ASTM A234 WPB is mostly often used in pipeline industry. All the A234 WPB pipe fittings include the seamless A234 WPB pipe fittings which are made from the seamless steel pipes, and the welded pipe fittings which are made from ERW steel pipes. The A234 WPB butt-welding pipe fittings include elbows, bends, returns, tees, reducers, end caps, crosses, lap joint stub ends, nipples, flanges and couplings.

Grade ASTM A403 is another popular choice for stainless steel pipe fittings made up of forged and rolled austenitic stainless steel and widely used in engineering industry, energy conversion plants, etc. ASTM A403 WP304L is the most common stainless steel pipe fittings material. This austenitic steel gives excellent resistance to stress corrosion cracking. The common products of ASTM A403 WP304L pipe fittings are elbows, tees, reducers, flanges, caps, cross. There are seamless and ERW A403 WP304L pipe fittings. The seamless A403 WP304L pipe fittings means the fittings are made from seamless steel pipes, ERW means the fittings are made from ERW steel pipes.

Common Grades, Sizes and Specifi­cations

Materials Specifications Grades Sizes Thickness
Carbon Steel/Alloy Steel ASTM A105N, ASTM A182, ASTM A234 WPB, WP1, WP5, WP9, WP11, WP12, WP22
  • ½” to 42”
  • Up to 9000LB
Up to Sch XXS
Low Temp Carbon Steel ASTM A350, ASTM A420 WPL3, WPL6
High Yield Carbon Steel ASTM A694, ASTM 860 WPHY42, WPHY52, WPHY60
Stainless Steel ASTM A182, ASTM A403 WP304/L, WP316/L, WP321

Other pipe fitting sizes and grades are available upon request.

Kian Huat Metal

Kian Huat Metal is Singapore’s leading pipe fittings supplier with a wide distribution network that spans over 20 countries in the Asia Pacific region. With over 30 years of experience, we provide the very best quality products, prompt delivery and highest standard of services at competitive prices. At Kian Huat Metal, we supply an extensive range of metals for various applications. Our inventory includes: stainless steel, structural steel, mild steel, galvanized steel, aluminium, brass, bronze and copper. Our hot rolled and cold rolled steel is available in a wide range of shapes including: bars, rods, universal beams, universal columns, pipes, hollow sections, channels, sheets and plates. We can cut according to your exact specifications.

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We ensure product quality and consistency through best practices and quality control that conform to local and international standards.

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We offer a competitively priced and extensive range of steel products for all industries.

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