Stainless Steel 321 and 321H Welded Pipes

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Stainless Steel 321 and 321H Welded Pipes Manufacturer, Supplier and Exporter in Houston , USA

Liam Pipes and Tubes, based in Houston, USA, stands out as a top manufacturer and supplier of Stainless Steel 321 and 321H Welded Pipes. They specialize in providing piping solutions that excel in high-temperature and corrosive environments. Stainless Steel 321 is a titanium-stabilized austenitic alloy that effectively resists intergranular corrosion after welding, while 321H, its high-carbon counterpart, is designed for superior creep strength. Liam’s welded pipes meet ASTM A312 and A358 standards, making them perfect for industries like chemical processing, aerospace, oil & gas, and power generation. With a strong focus on precision and durability, Liam delivers reliable, high-quality 321/321H welded piping solutions for critical service conditions.

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Stainless Steel 321/321H Welded Pipes are mainly made up of chromium (17–19%), nickel (9–12%), titanium (at least five times the carbon content), and carbon (up to 0.08% for 321; 0.04–0.10% for 321H). The titanium stabilization helps prevent carbide precipitation during welding, boosting resistance to intergranular corrosion. With its higher carbon content, 321H provides enhanced creep and high-temperature strength. These pipes boast a tensile strength ranging from 515 to 750 MPa and a yield strength of about 205 MPa. Their welded construction not only ensures strength but also offers cost-effectiveness, making them ideal for high-temperature applications that demand both corrosion resistance and structural integrity.

Stainless Steel 321 and 321H Welded Pipes Specification

Specifications : ASTM A312 / ASME SA312

Outside Diameter : 6.00 mm OD up to 914.4 mm OD, Sizes up to 24″ NB available Ex-stock, OD Size available Ex-stock

Thickness : 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS

Size : 1/2″ NB – 24″ NB

Type : Welded

Form: Round Pipes, Square Pipes, Rectangular Pipes.

Length : Single Random, Double Random & Required Length

End : Plain End, Beveled End, Treaded

Equivalent Grades for Stainless Steel 321 and 321H Welded Pipes

STANDARD	WERKSTOFF NR.	UNS	JIS	EN
SS 321	1.4541	S32100	SUS 321	X6CrNiTi18-10
SS 321H	1.4878	S32109	SUS 321H	X12CrNiTi18-9

321 and 321H Stainless Steel Welded Pipes 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

SS 321 and 321H Welded Pipes 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 %

If You Are Looking To Buy High Quality

We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.

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Why Choose 321 and 321H Stainless Steel Welded Pipes from Liam Pipes and Tubes?

Choosing Stainless Steel 321 and 321H Welded Pipes guarantees excellent corrosion resistance, high strength, and durability. Designed for diverse industrial applications, it delivers reliable performance in tough environments while maintaining competitive pricing for cost-effective solutions.

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Largest 321 and 321H Stainless Steel Welded Pipes Supplier in Houston , USA

Liam Pipes and Tubes, a leading manufacturer and supplier of Stainless Steel 321 and 321H Welded Pipes in Houston , USA, offers a comprehensive range of high-quality pipes and tubing suitable for various industrial applications. Our extensive inventory and commitment to exceptional service make us a trusted choice for regional products.

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321 and 321H Stainless Steel Welded Pipe Sizes

NB Sizes	Sch 5	Sch 10	Sch 40	Sch 80	Sch 160
1/8″	✓	✓	✓	✓
1/4″	✓	✓	✓	✓
3/8″	✓	✓	✓	✓
1/2″	✓	✓	✓	✓	✓
3/4″	✓	✓	✓	✓	✓
1″	✓	✓	✓	✓	✓
1 1/4″	✓	✓	✓	✓	✓
1 1/2″	✓	✓	✓	✓	✓
2″	✓	✓	✓	✓	✓
2 1/2″	✓	✓	✓	✓	✓
3″	✓	✓	✓	✓	✓
4″	✓	✓	✓	✓	✓
5″	✓	✓	✓	✓
6″	✓	✓	✓	✓

Physical Properties of SS 321 and 321H Welded Pipes

Grade	Density (kg/m3)	Elastic Modulus (GPA)	Mean Co-eff of Thermal Expansion (µm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C (J/kg.K)	Elec Resistivity (nΩ.m)
			0-100°C	0-315°C	0-538°C	At 100°C	At 500°C
321 and 321H	8027	193	16.6	17.2	18.6	16.1	22.2	500	720

Types of 321 and 321H Stainless Steel Welded Pipes

Are Custom Sizes Available for 321 and 321H Stainless Steel Welded Pipes?

We offer custom sizes for Stainless Steel 321 and 321H Welded Pipes to meet your specific needs. Our dedicated team at Liam Pipes and Tubes provides tailored solutions for all your piping and tubing requirements. For more information, contact us at sales@liampipes.us.

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Stainless Steel 321 and 321H Welded Pipes find extensive use in high-temperature settings, including exhaust manifolds, heat exchangers, refinery heaters, pressure vessels, and furnace components. Their excellent resistance to oxidation and intergranular corrosion makes them perfect for welded structures and thermal cycles. While 321 is suitable for general high-temperature service, 321H is the go-to choice for high-pressure or high-heat situations, such as in boilers.