Stainless Steel 321 Welded Tubes Manufacturer | SS 321 Welded Tubes Supplier

USA Piping Solution is a trusted manufacturer, stockist and supplier of Stainless Steel 321 Welded Tube (also known as SS 321 Welded Tube or SS 321 ERW Tube). The tubes are made of the electric resistance welding and electric fusion welding process, and are delivered in full annealed and pickled state, and are fabricated from titanium stabilized austenitic stainless steel. These SS 321 Welded Tubes are qualified to be used in heat exchangers, high temperature chemical processing equipment, condensers and boilers because of their resistance to intergranular corrosion and sensitization. We supply SS 321 Welded Tubes as per ASTM A249 and ASTM A269 specifications, material can be supplied with 3.1, EN 10204 certification, 3rd party inspection and NABL accredited test reports on request. We are regular exporters to customers from all over Europe, Middle East, Southeast Asia and North America.

SS 321 Welded Tube Specifications

Parameter	Details
Grade	SS 321 / SS 321H
Standard	ASTM A249 / ASME SA249, ASTM A269, ASTM A554
Manufacturing Method	ERW (Electric Resistance Welded), EFW (Electric Fusion Welded)
OD Range	6.35 mm to 304.80 mm
Wall Thickness	0.5 mm to 12.70 mm
Length	1 m to 6 m, cut to length, random
Schedule	SCH 5S, SCH 10S, SCH 40S, SCH 80S
End Finish	Plain End, Beveled End
Surface Finish	2B, No. 4, No. 8, BA, Pickled
Delivery Condition	Full Annealed
Testing	Hydrostatic Test, Eddy Current Test, Flattening Test
Documentation	EN 10204 3.1, MTR, Third Party Inspection

Need SS 321 Welded Tubes to ASTM A249?

USA Piping Solution holds ready stock in sizes from 6.35 mm to 304.80 mm OD. Contact our sales team for mill test certificates and same-week dispatch.

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Chemical Composition of SS 321 Welded Tubes

Element	SS 321	SS 321H
Carbon (C)	0.08% max	0.04 to 0.10%
Manganese (Mn)	2.00% max	2.00% max
Silicon (Si)	0.75% max	0.75% max
Phosphorus (P)	0.045% max	0.045% max
Sulfur (S)	0.030% max	0.030% max
Chromium (Cr)	17.00 to 19.00%	17.00 to 19.00%
Nickel (Ni)	9.00 to 12.00%	9.00 to 12.00%
Titanium (Ti)	5 x C min, 0.70% max	4 x C min, 0.70% max

Mechanical Properties of SS 321 Welded Tubes

Property	SS 321	SS 321H
Tensile Strength (min)	515 MPa	515 MPa
Yield Strength 0.2% (min)	205 MPa	205 MPa
Elongation in 2 in. (min)	40%	40%
Brinell Hardness	217 HB max	217 HB max
Rockwell B Hardness	95 HRB max	95 HRB max

SS 321 Welded Tube Equivalent Grade

AISI/ SUS	UNS	WNR. / DIN	EN	JIS	GB
321	32100	1.4541	X6CrNiTi18-10	SUS321	0Cr18Ni10Ti

SS 321 Welded Tubes vs SS 321 Seamless Tubes

Feature	SS 321 Welded Tubes	SS 321 Seamless Tubes
Manufacturing Method	ERW / EFW	Cold Drawn / Hot Finished
Wall Uniformity	Good	Excellent
Available OD Range	6.35 mm to 304.80 mm	6.35 mm to 101.60 mm
Surface Finish Options	More varied	Good
Cost	Lower	Higher
Pressure Rating	Lower than seamless	Higher
Weld Seam	Present	None
Common Standards	ASTM A249, A269, A554	ASTM A213, A269, A511
Typical Uses	Heat exchangers, condensers, structural	Superheaters, boilers, high pressure lines

ASTM A249 vs ASTM A269 for SS 321 Welded Tubes

Feature	ASTM A249	ASTM A269
Scope	Welded tubes for boilers, superheaters, heat exchangers	General service welded and seamless tubes
Wall Thickness	Thin to moderate	Thin to moderate
Test Requirement	Flattening + Hydrostatic	Eddy Current or Hydrostatic
Hardness Testing	Required for higher grades	Not mandatory
Typical Finish	Annealed and Pickled	Bright Annealed or Pickled
Application Focus	High temperature service	General industrial service

Applications of SS 321 Welded Tubes

Industry	Application
Power Plants	Boiler tube panels, superheater assemblies
Petrochemical	High temperature fluid lines, refinery process piping
Heat Exchangers	Shell and tube exchangers, air coolers
Condensers	Condenser bundles, coolers
Chemical Plants	Reactor jackets, reboiler tubes
Food and Beverage	Pasteurization equipment, high temperature lines
Pharmaceuticals	Sterile transfer tubing

Frequently Asked Questions

How quickly can SS 321 Welded Tubes be dispatched after order confirmation?

Stocked sizes from 6.35 mm to 304.80 mm OD are typically dispatched within the same week of order confirmation, subject to final quantity and documentation requirements.

What's the cost difference between welded and seamless SS 321 tubes?

Welded SS 321 Tubes are generally 10 to 20 percent more economical than seamless equivalents in the same size, owing to a simpler and faster manufacturing process.

Can SS 321 Welded Tubes be supplied in square or rectangular shapes?

Yes, we supply SS 321 Welded Tubes in round, square, and rectangular profiles to suit structural, architectural, and process equipment fabrication needs.

Do you provide eddy current testing reports for welded tubes?

Yes, eddy current test reports are provided as part of standard quality documentation, verifying weld integrity across the full length of each SS 321 Welded Tube.

Fast Delivery on SS 321 Welded Tubes

USA Piping Solution maintains ready stock of SS 321 Welded Tubes in popular sizes. Contact our sales team for the best price, documentation package, and shipment schedule.

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Stainless Steel 321 Welded Tubes Manufacturer and Supplier

SS 321 Welded Tube Specifications

Types of SS 321 Welded Tubes