Stainless Steel 321 and 321H Seamless Pipes

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Stainless Steel 321 and 321H Seamless Pipes Manufacturer, Supplier and Exporter in Hamilton, New Zealand

Blundell Pipes and Tubes, based in Hamilton, New Zealand, has built a solid reputation as a reliable manufacturer and supplier of top-notch stainless steel seamless pipes. They focus on precision-engineered solutions, offering Stainless Steel 321 and 321H seamless pipes that are perfect for tough industrial applications where performance and reliability are a must. These pipes are celebrated for their durability and resistance to corrosion, all while meeting international standards. They find their place in various industries, such as chemical processing, petrochemical, and power generation. With a wealth of technical expertise and tailored solutions, Blundell Pipes and Tubes guarantees that clients receive seamless pipes that align with strict specifications and long-term operational needs.

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The Stainless Steel 321 and 321H Seamless Pipes are made from titanium-stabilized austenitic stainless steel, which includes chromium, nickel, and titanium. The 321H variant has a higher carbon content, enhancing its creep resistance and strength at elevated temperatures. Both grades are known for their excellent resistance to intergranular corrosion, pitting, and oxidation, even in harsh environments. On the mechanical side, these pipes boast high tensile and yield strength, toughness, and good fatigue resistance, all while maintaining weldability and machinability. Their seamless design guarantees uniform wall thickness, dimensional stability, and reliable performance under high-pressure and high-temperature conditions.

Stainless Steel 321 and 321H Seamless Pipes Specification

Range : 6NB to 1200NB

Outer Diameter : 1/8″ NPS to 12″ NPS

Thickness : 0.6 mm to 12.7 mm

Schedules : SCH. 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS.

Length : Single Random, Double Random & Cut Length

Specifications : ASTM A312 / ASTM SA312

Types : Round, Square, Rectangle, Hydraulic, Honed Tubes

End : Plain End, Beveled End

Equivalent Grades for Stainless Steel 321 and 321H Seamless Pipes

STANDARD	UNS	WERKSTOFF NR.
SS 321	S32100	1.4541
SS 321H	S32109	1.4878

321 and 321H Stainless Steel Seamless Pipes Chemical Composition

SS	321	321H
Ni	09 – 12	09 – 12
N	0.10	0.10
Cr	17 – 19	17 – 19
C	0.08 max	0.04 – 0.08
Si	1 max	0.75 max
Mn	2 max	2 max
P	0.040 max	0.045 max
S	0.030 max	0.03 max
TI	4(C+N)	0.70 max

SS 321 and 321H Seamless Pipes Mechanical Properties

Grade	321	321H
Tensile Strength (MPa) min	515	515
Yield Strength 0.2% Proof (MPa) min	205	205
Elongation (% in 50mm) min	40	40
Hardness
Rockwell B (HR B) max	95	95
Brinell (HB) max	217	217

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 Seamless Pipes from Blundell Pipes and Tubes?

Stainless Steel 321 and 321H seamless pipes are austenitic chromium-nickel alloys that are stabilized with titanium to avoid carbide precipitation. Typically, they contain 17–19% chromium, 9–12% nickel, and 0.5% titanium, with 321H featuring a higher carbon content to boost high-temperature strength. These seamless pipes showcase impressive mechanical properties, boasting a tensile strength of 515–750 MPa, yield strength of 205–275 MPa, and elongation of 35–45%. They offer remarkable thermal stability, creep resistance, and corrosion resistance, making them ideal for high-temperature and aggressive environments.

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Largest 321 and 321H Stainless Steel Seamless Pipes Supplier in Hamilton, New Zealand

Blundell Pipes and Tubes, one of the largest suppliers of Stainless Steel 321 and 321H Seamless Pipes in Hamilton, New Zealand, offers a comprehensive range of high-quality pipes and tubes suitable for various industrial applications. Their extensive inventory and commitment to exceptional service make them a go-to choice for stainless steel products in the region.

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Grade specifications of SS 321 and 321H Seamless Pipes

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
Grade	UNS No	BS	En	No	Name	Swedish SS	Japanese JIS
321	S32100	321S31	58B, 58C	1.4541	X6CrNiTi18-10	2337	SUS 321
321H	S32109	321S51	–	1.4878	X6CrNiTi18-10	–	SUS 321H

Physical Properties of SS 321 and 321H Seamless Pipes

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/0C)			Thermal Conductivity (W/m.K)		Specific Heat 0-1000C (J/kg.K)	Electrical Resistivity (n.m)
			0-100°C	0-315°C	0-538°C	at 100°C	at 500°C
321	8027	193	16.6	17.2	18.6	16.1	22.2	500	720

Types of 321 and 321H Stainless Steel Seamless Pipes

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

These seamless pipes are commonly utilized in applications that demand exceptional high-temperature performance and reliability. You’ll often find them in heat exchangers, boilers, chemical processing equipment, petrochemical plants, and exhaust systems. The enhanced stability of 321 and 321H ensures they can serve long-term without facing intergranular corrosion or a drop in strength. They’re also used in aerospace, power generation, and food processing industries, where maintaining structural integrity and resisting thermal stress is crucial. Their versatility, durability, and performance truly set them apart.

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You’ll find Stainless Steel 321 and 321H Seamless Pipes in a variety of applications, including boilers, heat exchangers, pressure vessels, and piping systems that operate under high temperatures. They’re also essential in petrochemical and chemical plants, oil & gas facilities, and power generation units that require corrosion-resistant and heat-resistant piping solutions. Plus, they’re perfect for furnace components, industrial ovens, and high-temperature process piping where long-term strength and reliability are crucial. Their blend of mechanical strength and durability makes them a go-to choice for demanding environments.