Stainless Steel 321 and 321H EFW Pipes

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Stainless Steel 321 and 321H EFW Pipes Manufacturer, Supplier and Exporter in Cape Town, South Africa

Bosega Pipes and Tubes, located in Cape Town, South Africa, specializes in providing top-notch **Stainless Steel 321 and 321H EFW Pipes** that are engineered for high-temperature and corrosion-resistant applications. These Electric Fusion Welded (EFW) pipes are particularly suited for industries where welding, heat resistance, and structural integrity are crucial. Crafted in accordance with international standards, Bosega’s 321/321H EFW pipes deliver outstanding performance in challenging environments like chemical processing, oil refineries, and thermal power plants.

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Stainless Steel 321 and 321H EFW (Electric Fusion Welded) Pipe are primarily made of chromium (17-19%), nickel (9-12%), and titanium (stabilizer) The main difference between the two is that 321H has a high carbon content for high temperature strengths ( 0.04-0.10%). Both features provide excellent corrosion resistance, especially in high humidity. They have good mechanical properties such as tensile strength (515 MPa), yield strength (205 MPa), and resist stress corrosion cracking. Advantages include durability, weldability and oxidation resistance, making it ideal for heat exchangers and chemical processes.

Stainless Steel 321 and 321H EFW Pipes Specification

Specification	ASTM A358 / ASME SA358
Specification	A / SA358 CLASS 1, A / SA358 CLASS 2, A / SA358 CLASS 3, A / SA358 CLASS 4, A / SA358 CLASS 5
Grades	304, 304L, 304H, 309S, 310S, 316, 316L, 316H, 317L, 321, 321H, 347, 347H, 904L ETC.
Type	EFW, ELECTRIC FUSION WELDED
Outer Diameter Size	Electric Fusion Welded / ERW- 8″ NB To 110″ NB (Nominal Bore Size)
Wall Thickness	Schedule 10 To Schedule 160 (3 mm to 100 mm Thickness)
Length	01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size.
Ends	Plain Ends / Beveled Ends
Delivery Conditions	As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered
Coating	Electropolish, Mechanical Polish, Satin Finish, Passivated
Dimension	All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM and ASME
Value Added Services	Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment
Packaging	Loose / Bundle / Wooden Pallet / Wooden Box / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector
Material Test Certificate	Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC

Equivalent Grades for Stainless Steel 321 and 321H EFW Pipes

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

321 and 321H Stainless Steel EFW 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 EFW Pipes Mechanical Properties

Tensile Strength	Yield Strength (0.2%Offset)	Elongation	Hardness
			Rockwell B (HR B) max	Brinell (HB) max
Psi – 75000, MPa – 515	Psi – 30000, MPa – 205	35 %	95	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 Stainless Steel 321 and 321H EFW pipes from Bosega Pipes and Tubes?

**Stainless Steel 321** is enhanced with titanium to guard against intergranular corrosion during welding and extended heat exposure, while **321H** is a high-carbon variant that offers better creep and stress rupture resistance at elevated temperatures. The EFW pipes are produced by fusing the edges of stainless steel plates or coils using high-voltage electric arcs, resulting in robust, uniform welds that are ideal for larger diameters and thinner walls. These grades boast excellent mechanical properties and oxidation resistance up to 870°C, making them perfect for transporting fluids at high temperatures.

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Largest Stainless Steel 321 and 321H EFW pipes Supplier in Cape Town, South Africa

Bosega Pipes and Tubes, a leading manufacturer and supplier of Stainless Steel 321 and 321H EFW Pipes in Cape Town, South Africa, 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 EFW Pipe Sizes

NPS Designator	Outside Diameter		Nominal Wall Thickness
	in.	mm	Schedule 5SA		Schedule 10SA		Schedule 40SA		Schedule 80SA
	in.	mm	in.	mm	in.	mm	in.	mm	in.	mm
8	8.625	219.08	0.109	2.77	0.148	3.76	0.322	8.18	0.500	12.70
10	10.750	273.05	0.134	3.40	0.165	4.19	0.365	9.27	0.500B	12.70B
12	12.750	323.85	0.156	3.96	0.180	4.57	0.375B	9.52B	0.500B	12.70B
14	14.000	355.60	0.156	3.96	0.188B	4.78B	…	…	…	…
16	16.000	406.40	0.165	4.19	0.188B	4.78B	…	…	…	…
18	18.000	457.20	0.165	4.19	0.188B	4.78B	…	…	…	…
20	20.000	508.00	0.188	4.78	0.188B	4.78B	…	…	…	…
22	22.000	558.80	0.188	4.78	0.218B	5.54B	…	…	…	…
24	24.000	609.60	0.218	5.54	0.250	6.35	…	…	…	…
30	30.000	762.00	0.250	6.35	0.312	7.92	…	…	…	…

Types of Stainless Steel 321 and 321H EFW Pipes

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

These pipes find common use in **refinery piping systems**, **heat exchangers**, **furnace components**, **aircraft exhaust systems**, and **superheater tubes**, where performance under thermal stress is vital. Their exceptional weldability and resistance to scaling and oxidation make them especially valuable in scenarios where standard austenitic grades might fall short. Stainless Steel 321 and 321H EFW Pipes from Bosega provide a reliable solution for industries that demand durable, high-temperature piping with consistent long-term performance.

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Stainless Steel 321 and 321H EFW Pipes are widely used in high-temperature corrosion environments due to their excellent thermal resistance and mechanical strength They are commonly used in air and spacecraft exhaust systems from inside, furnace components and heat oxidizers. In the chemical and petrochemical industries, these pipelines are ideal for process equipment, heat exchangers and raw materials. The high carbon content of 321H makes it suitable for high temperature applications, such as super heaters, boilers and pressure vessels, where high tensile strength and resistance to thermal stress are required.