ASME SA213 TP321 Stainless Steel Bright Annealed Tube

GNEE offers ASME SA213 TP321 stainless steel bright annealed tubes with a bright annealed surface finish (Ra ≤ 0.4μm) that enhances corrosion resistance in the 800-1500°F (427-816°C) range due to chromium carbide precipitation. These tubes offer superior intergranular corrosion resistance and creep strength compared to standard 304 stainless steel. These tubes are available in standard sizes of 12.7-114.3 mm OD and 0.89-4.78 mm wall thickness, with tight tolerances (OD ±0.05 mm, wall thickness ±0.03 mm). They are suitable for critical applications such as high-temperature chemical processing, power plant superheaters, and aircraft exhaust systems.

 

 

GNEE ensures fast delivery from stock, supports custom cutting and end finishing, and provides full material certification, including factory test reports and third-party corrosion test results.

 

Equivalent Grades:

Standard	WERKSTOFF NR.	Unified Numbering System	European Standards	AFNOR	British Standards	GOST	Japanese Standards
321	1.4541	S32100	X6CrNiTi18-10	-	321S31	08KH18N10T	SUS 321
321H	1.4878	S32109	X8CrNiTi18-10	-	321S51	12KH18N10T	SUS 321H

 

Specification:

Specification	ASTM A-213 & Its equivalent ASME, DIN & EN Standard.
Grades	321, 321H
Type	Seamless Ferritic and Austenitic Boiler, Superheater, and Heat-Exchanger Tubes
Outer Diameter Size	1/4" OD, NB to 6" OD, NB sizes
Thickness	0.41mm to 25.4mm
Length	Up to 6 meters, custom cut lengths
Ends	No.1 Pickled Finish, No.4 finish, BA Finish, Electropolished Seamless Tubes
Delivery Conditions	As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw
Other Testing	Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiographic Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc
Dimension	All Pipes & Tube Is Manufactured and Inspected / Tested to the Relevant standards including ASTM and ASME
Packaging	Loose / Bundle / Wooden Pallet / Wooden Box / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector

 

Chemical Composition:

Grade	UNS	C	Mn	P	S	Si	Cr	Ni	Ti
321	S32100	0.08 max	2.00 max	0.045 max	0.03 max	1.00 max	17.0-19.0	9.0-12.0	5(C+N)-0.07
321H	S32109	0.04-0.10	2.00 max	0.045 max	0.03 max	1.00 max	17.0-19.0	9.0-12.0	4(C+N)-0.07

 

Mechanical Properties:

Grade	Tensile Strength, min, ksi (MPa)	Yield Strength, min, ksi (MPa)	Elongation in 2 in. or 50mm, min (%)	Hardness		Solutioning Temperature, min, °F(°C)
				Rockwell	Brinell/Vickers
321	75(515)	30(205)	35	90HRB	192HBW/200HV	1900(1040)
321H	75(515)	30(205)	35	90HRB	192HBW/200HV	2000(1090)

 

Applications:

1.Food preparation equipment particularly in chloride environments.

2.Laboratory benches & equipment.

3.Coastal architectural panelling, railings & trim.

4.Boat fittings.

5.Chemical containers, including for transport.

6.Heat Exchangers.

 

Non-Destructive Testing (NDT)

Eddy Current Testing (ET): 100% full-tube inspection. Conducted in accordance with ASTM E426 to detect through-wall defects or surface cracks in the tube wall.
Hydrostatic Testing: Each tube must withstand a specified pressure for a minimum of 5 seconds without leakage.
Air Under Water Testing: For BA (Bright Annealed) tubes, customers frequently request that the tubes be pressurized with high-pressure air and submerged in a water tank to detect minute pinholes; this method is more sensitive than hydrostatic testing.

Professional Packaging

End Caps: Both ends of every tube must be fitted with protective caps to prevent dust ingress or moisture accumulation within the interior walls.
Export-Grade Fumigated Plywood Cases: The tubes are stacked in layers within the wooden crates, with each layer separated by wooden boards or soft cushioning materials.
Special Considerations:
Marking: The exterior of the crate must be clearly marked with the following information, Size (OD x WT x L), Heat No., Weight, as well as warning symbols such as "Do Not Stack" and "Keep Dry."