ASTM A778 TP321 Stainless Steel Welded Pipe

ASTM A778 specification governs the supply of unannealed welded stainless steel pipes, covering various grades to meet diverse requirements.

GNEE is a renowned supplier of stainless steel welded pipes, offering ASTM A778 stainless steel pipes specifically tailored for medium-to-low temperature applications. The ASTM A778 TP321 welded pipe we supply is an unannealed welded austenitic stainless steel pipe, designed for low-to-medium temperature environments and general corrosive applications. This grade of stainless steel contains titanium, which stabilizes the material and prevents carbide precipitation during the welding process.

The outer diameter range of ASTM A778 TP321 stainless steel welded pipes spans from 1/4 inch to 60 inches, depending on specific requirements and standards. A wide variety of production types are available, including welded pipes, seamless pipes, cold-drawn pipes, or hot-rolled pipes, catering to diverse application needs. Additionally, GNEE provides pipes with threaded, beveled, or plain ends, ensuring compatibility with various systems and equipment.

ASTM A778 Stainless Steel Pipe standard specification

Tube Sizes	3 In (75 mm) To 48 In (1200 Mm) Od – 0.062 In (1.5 Mm) To 0.5 In (12.5 Mm) Wall Thickness
Grades	ASTM A778 TP304L ASTM A778 TP316L ASTM A778 TP317L ASTM A778 TP321 ASTM A778 TP347
Length	10 Ft (3 M) Lengths Or Over.
Length Tolerances	No Tube Shall Be More Than 0.25 In (6 Mm) Over That Specified. No Tube Shall Be Shorter Than Specified.
Straightness	0.25 In (6 Mm) Max Deviation From 10 Ft (3 M) Straight Edge.

Chemical and Mechanical Properties of ASTM A778 TP321 Stainless Steel Welded Pipe

Element	Content Range
Carbon (C)	≤ 0.08 %
Manganese (Mn)	≤ 2.00 %
Phosphorus (P)	≤ 0.045 %
Sulfur (S)	≤ 0.030 %
Silicon (Si)	≤ 0.75 %
Chromium (Cr)	17.00 – 19.00 %
Nickel (Ni)	9.00 – 12.00 %
Titanium (Ti)	≥ 5 × (C+N) min 0.70 %*

Mechanical Properties

Property	Standard Value
Tensile Strength (MPa)	≥ 515 MPa
Yield Strength (0.2% Offset, MPa)	≥ 205 MPa
Elongation (% in 50 mm)	≥ 35 %
Hardness (Rockwell B)	≤ 95 HRB

Quality Control System
Implementation:
Raw material PMI verification
In-process EC/UT non-destructive testing
100% dimensional inspection
All inspection records and photos are traceable, and SGS/TUV sampling reports are provided. Our three-level quality control system ensures consistent composition and performance for every batch of TP321 products, streamlining the incoming product inspection process for distributors.

If you have project requirements for 321 stainless steel pipe, please feel free to place an order. GNEE maintains a large inventory of popular products for your selection. Available in both seamless and welded configurations, contact our factory for detailed chemical composition and free samples. We offer competitive pricing and excellent service.

Stainless Steel Grades

Tube Type

Technique

304, 304L, 316, 316L, 309/309S,
310/310S, 321/321H, 347/347H,
Duplex2205 / S31803, etc.

Welded(PLASMA+TIG)

Seamless

Annealed & Pickled, Bead Blasted, Brushed Finish

Mill Test Certificate (MTC)

Certificate

Test Content

EN10204 3.1

ISO 9001:2015

PED 2014/68/EU

AD 2000-WO

Flange & Flaring Test,Reverse Flattening Test, Roughness Test, Hydrostatic/Pneumatic Test, Eddy Current Test (NDT), Surface Finish Verification, Dimensional Inspection, Material Certification

Packaged in waterproof paper and steel strapping, these products meet standard export seaworthy packaging requirements and are suitable for various shipping methods. Customized options are also available upon request.