Stainless steel is a popular choice for many projects due to its ability to withstand high temperatures, corrosion, and wear. There are many types available for stainless steel pipes and tubes, but two of the most commonly used are type 321 and type 321H. Stainless steel 321 Pipes is an austenitic alloy that contains titanium as the main alloying element. It is also known as Type SUS321 or UNS S32100. The titanium in type 321 makes it more resistant to oxidation than other types of stainless steel and provides excellent resistance to intergranular corrosion. This makes 321 Stainless Steel Pipes perfect for applications requiring exposure to high temperatures, such as automotive exhaust systems or furnace parts.

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Stainless steel 321H Tubes are very similar to type 321 but with added carbon content. This higher carbon content allows it to be heat treated at even higher temperatures than regular type 321. It is also known as Type SUS321H or UNS S32109. Because of its increased hardness, it is often used in applications that require superior strength or excellent resistance to corrosion, such as aerospace components or pressure vessels. In addition, because 321H Stainless Steel Pipes can withstand higher temperatures than regular type 304 stainless steel, it is also often used in furnace parts and oven liners where there will be direct contact with high-temperature environments. Stainless Steel 316H Pipes, Stainless Steel 304 Tubes, and many more grades are available.

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The benefits of using SS 321 Tubes include their superior strength and resistance to corrosion, oxidation, and wear when compared with other types of stainless steel. In addition, both types can be easily cut and formed into almost any shape needed due to their malleability making them perfect for custom projects or repairs where specific dimensions are required. Both types have good weldability properties allowing them to be joined together using various welding techniques if necessary for project or application needs. Different types of products are available, such as Incoloy 925 Flanges, Stainless Steel 15-5 PH Nuts, etc.

SS 321/321H Pipes & Tubes

Stainless Steel 321/321H Pipes & Tubes

SS 321H Pipes are high-performance stainless steel tubes that give superior corrosion resistance to many corrosive media and superior strength to other stainless steels. They also have excellent machinability and weldability characteristics, making them ideal for various industrial applications.

What is the difference between Stainless Steel 321 and 321H Tubes?

Stainless steel 321 and 321H tubes are both variations of the basic austenitic grade 321 stainless steel. The main difference between SS 321 and 321H tubes is their carbon content. SS 321H has a higher carbon content than 321, typically in the range of 0.04-0.10%. This higher carbon content is intended to improve the high-temperature strength of the alloy.

What Stainless Steel 321H Pipes are used for?

Stainless Steel 321H pipes are commonly used in high-temperature applications such as aerospace and chemical processing industries, as well as in exhaust systems for automobiles and aircraft. They are preferred for their improved high-temperature strength and resistance to intergranular corrosion.

What are the benefits of Stainless Steel 321H Tubes?

Stainless Steel 321H Tubes offer several benefits due to their high-temperature resistance, excellent corrosion resistance, & durability. They can withstand temperatures up to 816°C (1500°F), making them ideal for high-temperature applications. The addition of titanium in their composition improves their resistance to intergranular corrosion, making them suitable for use in harsh environments.

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Stainless Steel 321/321H Pipes & Tubes Specification

Standard ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790

Dimensions ASTM, ASME and API

Range 1/2" NB TO 24" NB IN SCH 5, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160 & XXS as Per NACE MR 01 75

Thickness 0.3mm – 50 mm

Outer Diameter 6.00 mm OD up to 914.4 mm OD

Schedule SCH 10, SCH20, SCH30, SCH40, STD, SCH60, XS, SCH80, SCH120, SCH140, SCH160, XXS

Type Seamless / ERW / Welded/ Fabricated

Form Round, Square, Rectangular, Hydraulic, etc.

Length Single Random, Double Random & Cut Length

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SUS 321/321H Steel Pipes and Tubes Equivalent Indian Standard

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

ASTM A312 Stainless Steel 321/321H Seamless and Welded Pipe 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

ASME SA213 SS 321/321H Tubing 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 Pipes and Tubes

  • 321 SS Round Pipe & Tube
  • Stainless Steel 321H Square Pipe & Tube
  • Stainless Steel 321/321H Rectangular Pipe & Tube
  • SS 321 Oval Pipe & Tube
  • Stainless Steel 321H Polished Pipe & Tube

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