Stainless steel pipe fittings come in a variety of types, sizes, and grades. Two of the most common are grade 321 and grade 321H. Both are made of chromium-nickel stainless steel alloys that offer high strength and excellent corrosion resistance.

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Grade 321 (also known as UNS S32100) is titanium stabilized austenitic stainless steel that offers good strength and excellent corrosion resistance at temperatures up to about 900°C (1650°F). Steel 321 Pipe Fittings also has good resistance to oxidation in intermittent service up to 870°C (1600°F). The alloy offers improved intergranular corrosion resistance after welding or stress relieving. Stainless Steel 316H Pipe Fittings, Stainless Steel 316TI Pipe Fittings and many more grades are also available.

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What is Grade 321H?

Grade 321H (UNS S32109) is a higher carbon version of grade 321 stainless steel. It provides an even better level of corrosion resistance than grade 321 due to its increased carbon content. This makes it ideal for applications that require superior weldability, such as aircraft exhaust systems, automotive headers, manifolds, mufflers and tailpipes, steam superheater tubes, expansion joints, boiler tubes, heat exchanger tubing and condenser tubing.

Stainless Steel 321/321H Pipe Fittings

Stainless Steel 321/321H Pipe Fittings

Stainless Steel 321 Pipe Fittings can be used in both general service industries specialty applications where their high temperature metallurgical properties are required. This includes processing industries such as petrochemical plants, power plants, oil refineries, chemical plants and pulp/paper mills. ASTM A403 Stainless Steel WP321H Pipe Fittings can also be used for architectural applications such as handrails or balustrades in commercial buildings or residential dwellings. Moreover, they are commonly used for food processing equipment such as dairy processing equipment or brewing systems.

Stainless Steel 321H Pipe Fittings can be found in aircraft exhaust systems or automotive headers where their superior weldability is needed.Stainless Steel WP321 Pipe Fittings are available in two main grades: grade 321 and grade 321H pipe fittings. Both grades offer high strength and excellent corrosion resistance, however, grade 321H offers the added benefit of superior weldability due to its higher carbon content when compared with grade321 stainless steel pipe fittings. Grade321 can be used for a variety of general service industries while Grade321H has specific uses within highly specialized fields such as aircraft exhausts or automotive headers where superior weldability is needed. Different types of products are available, such as Duplex Steel UNS S31803 Round Bars, Duplex Steel ASTM A479 UNS S32205 Nuts, etc.

What is Stainless Steel 321 and why is it used for pipe fittings?

Stainless Steel 321 is a type of austenitic stainless steel that contains titanium as a stabilizing element. It has excellent corrosion resistance and high-temperature strength, making it a popular choice for use in high-temperature applications such as pipe fittings.

What are the benefits of using Stainless Steel 321 pipe fittings?

Stainless Steel 321 pipe fittings offer several benefits, including excellent corrosion resistance, high-temperature strength, and good weldability. They are also resistant to intergranular corrosion and have good oxidation resistance.

What are the applications of Stainless Steel 321H pipe fittings?

Stainless Steel 321H is a high carbon version of Stainless Steel 321 and is known for its excellent high-temperature strength and corrosion resistance. Stainless Steel 321H pipe fittings are used in a variety of applications across many industries.

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SS 321/321H Butt weld Pipe Fittings Specification

SpecificationsASTM A403 / ASME SA403

DimensionsASME/ANSI B16.9, ASME B16.28, MSS-SP-43, MSS SP-79

Size1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated)

Type Seamless / Welded / Fabricated

Bending RadiusR=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom

Thickness Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS

Grade 321/321H UNS (S32100, S32109), DIN (1.4541, 1.4878)

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Stainless Steel WP321/321H Butt weld Fittings Equivalent Indian Standard

SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9

ASTM A403 SS WP321/321H Pipe Fittings Chemical Composition

Grade C Mn Si P S Cr N Ni Ti
SS 321 0.08 max 2.0 max 1.0 max 0.045 max 0.030 max 17.00 - 19.00 0.10 max 9.00 - 12.00 5(C+N) – 0.70 max
SS 321H 0.04 – 0.10 2.0 max 1.0 max 0.045 max 0.030 max 17.00 - 19.00 0.10 max 9.00 – 12.00 4(C+N) – 0.70 max

WP321/321H Stainless Steel ASME SA403 Butt weld Fittings Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1457 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %

Other Types of 321/321H Stainless Steel Butt weld Pipe Fittings

  • Stainless Steel WP321 Elbow
  • WP321H Stainless Steel Pipe Tee
  • Stainless Steel WP321 Buttweld Cross
  • SS 321 Butt weld Pipe Reducer
  • Stainless Steel 321H End Cap

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