Stainless Steel Welded Pipe

Standard	Material / Grade	Product Type
ASTM A312 / ASME SA312	TP304, TP304L, TP316, TP316L, TP321, TP347, TP310S	Seamless & Welded Austenitic Stainless Steel Pipe
ASTM A358 / ASME SA358	304, 304L, 316, 316L, 321, 347	Electric Fusion Welded (EFW) Large Diameter Pipe
ASTM A249 / ASME SA249	TP304, TP304L, TP316, TP316L, TP321	Welded Austenitic Stainless Steel Tubing
ASTM A269	TP304, TP304L, TP316, TP316L	Seamless & Welded General Service Tubing
ASTM A270	304, 304L, 316, 316L	Sanitary Welded Stainless Steel Tube
ASTM A554	201, 304, 304L, 316, 316L	Welded Mechanical Stainless Steel Tube
ASTM A778	304, 304L, 316, 316L	Welded Unannealed Austenitic Stainless Steel Pipe
EN 10217-7	1.4301 (304), 1.4404 (316L), Duplex grades	Welded Stainless Steel Pressure Tubes
EN 10312	Austenitic stainless steel grades	Welded Stainless Steel Tubes for Water Applications
JIS G3459	SUS304, SUS304L, SUS316, SUS316L, SUS321	Stainless Steel Pipes
JIS G3446	SUS304, SUS316, SUS430	Stainless Steel Tubes for Mechanical Structures
GB/T 12771	06Cr19Ni10 (304), 022Cr17Ni12Mo2 (316L)	Welded Stainless Steel Pipe
GB/T 21833	Austenitic stainless steel grades	Welded Stainless Steel Tubes for Heat Exchangers

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The required pipe size and schedule

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Stainless steel welded pipes are manufactured using controlled production processes that encompass raw material inspection, strip slitting, forming, welding, heat treatment, sizing, surface finishing, and final inspection. Premium stainless steel strips are precisely shaped using roll-forming technology, followed by TIG, ERW, or high-frequency welding processes to ensure uniform weld strength. Every pipe undergoes 100% visual inspection, dimensional measurement, PMI material verification, hydrostatic testing, and ultrasonic flaw detection.

 

 

Stainless Steel Welded Pipe Specifications

Item	Technical Description	Reference Standards
Product Name	Stainless Steel Welded Pipe / Tube	-
Welding Method	ERW (Electric Resistance Welding) EFW (Electric Fusion Welding) SAW (Submerged Arc Welding)	-
Material Grades	TP304/304L, TP316/316L, TP321, TP310S, TP347H, S31803 (Duplex)	ASTM / AISI / UNS
Size Range	OD: 6mm - 2500mm (1/8" - 100")  WT: 0.5mm - 50mm (SCH 5S - SCH 160)	ASME B36.19M, ASME B36.10M
Length	Single Random Length (SRL) Double Random Length (DRL) Fixed Length (Max 18m)	-
Surface Finish	Pickled (No.1), Polished (Grit 180, 240, 320, 400), Bright Annealed (BA)	-
End Finish	Plain End (PE), Beveled End (BE), Threaded End	-

 

Chemical Composition (%) 

Grade (UNS)	C (max)	Mn (max)	P (max)	S (max)	Si (max)	Cr	Ni	Mo
TP304 (S30400)	0.08	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0	-
TP304L (S30403)	0.03	2.00	0.045	0.030	1.00	18.0-20.0	8.0-12.0	-
TP316 (S31600)	0.08	2.00	0.045	0.030	1.00	16.0-18.0	10.0-14.0	2.0-3.0
TP316L (S31603)	0.03	2.00	0.045	0.030	1.00	16.0-18.0	10.0-14.0	2.0-3.0
S31803 (Duplex)	0.03	2.00	0.030	0.020	1.00	21.0-23.0	4.5-6.5	2.5-3.5

 

Mechanical Properties

Grade	Tensile Strength (Rm)	Yield Strength (Rp 0.2)	Elongation (A)	Hardness (HB/HRB)
Unit	min. MPa (ksi)	min. MPa (ksi)	min. %	max.
TP304	515 (75)	205 (30)	35%	192 HBW / 90 HRB
TP304L	485 (70)	170 (25)	35%	192 HBW / 90 HRB
TP316	515 (75)	205 (30)	35%	192 HBW / 90 HRB
TP316L	485 (70)	170 (25)	35%	192 HBW / 90 HRB
S31803	620 (90)	450 (65)	25%	293 HBW / 31 HRC

 

Dimensional Tolerances per ASTM A312 

Outside Diameter (OD) Range	OD Tolerance	Wall Thickness (WT) Tolerance
1/8" to 1-1/2"	± 0.40 mm	+ 20.0% / - 12.5%
1-1/2" to 4"	± 0.79 mm	+ 20.0% / - 12.5%
4" to 8"	+ 1.59 mm / - 0.79 mm	+ 20.0% / - 12.5%
8" to 12"	+ 2.38 mm / - 0.79 mm	+ 22.5% / - 12.5%
> 12"	± 1% of OD	+ 22.5% / - 12.5%

 

Food & Beverage: Safe transport of milk, fruit juice, and various beverages under hygienic and easy-to-clean conditions.
Chemical & Pharmaceutical: Transport of strong acids, chemicals, and sterile medical solutions, maintaining material stability.
Water Treatment: Applications in municipal water supply, wastewater treatment systems, and filtration/screening facilities.
Automotive & Aerospace: Manufacturing of reliable exhaust systems, fuel lines, and structural transport components. Energy & Power Generation: Transport of high-temperature steam and cooling fluids in power plants and boiler equipment.
Architecture & Design: Creation of durable handrails, building facades, structural frameworks, and interior decorative elements.

Please let me know:
The specific industry or project you are involved in, as well as the required stainless steel grade (such as 304 or 316). I can assist you in determining the appropriate material specifications or fitting requirements.

Contact now

As a professional Stainless Steel Welded Pipe Manufacturer and Supplier, GNEE utilizes advanced production equipment including automatic tube forming machines, TIG/ERW/laser welding lines, CNC sizing units, straightening machines, heat treatment furnaces and online inspection systems. During weld seam processing, pipes undergo internal and external weld grinding, pickling and passivation, solution annealing, surface polishing and precision calibration to improve corrosion resistance and appearance quality.

 

Test Category	Testing Items	Purpose
Non-Destructive Test (NDT)	Hydrostatic Test	Leakage check
	Eddy Current Test	Surface/Subsurface defects
	Ultrasonic Test	Internal defects
	Radiographic Test (RT/X-ray)	Weld seam integrity
Mechanical Test	Flattening Test	Weld ductility
	Flaring Test	Material workability
Chemical Analysis	PMI (Positive Material Identification)	Grade verification
Visual/Dimensional	Visual Inspection / Gauge check	Appearance and size compliance

 

 

GNEE Stainless Steel Welded Pipes are packed according to international export standards to ensure safe transportation and product protection. Each pipe is inspected before packing and protected with plastic caps, waterproof wrapping film, EPE foam and anti-rust materials to prevent surface damage, moisture and contamination. Pipes are bundled with steel straps, separated by protective layers, and loaded into strong seaworthy wooden cases or steel frames for container shipment. Standard packing supports 6 m and 12 m pipe lengths, with clear labels showing grade, size, heat number and quantity, ensuring easy identification and traceability at destination ports worldwide.

 

Q1: What is the difference between ASTM A312, ASTM A554, and ASTM A249?

A:ASTM A312: Standard for industrial seamless and welded pipes used in high-temperature and general corrosive services (e.g., oil & gas, chemical processing).

ASTM A554: Standard for ornamental, structural, or mechanical tubing where aesthetic appearance and dimensional precision are prioritized over pressure rating.

ASTM A249: Standard for welded tubes intended for boilers, superheaters, heat exchangers, and condenser applications where heat transfer efficiency is critical.

 

Q2: Should I choose 304/304L or 316/316L stainless steel welded pipes?

A:304/304L: Cost-effective for general industrial applications, structural use, and fresh water environments.

316/316L: Contains 2–3% Molybdenum (Mo), making it significantly more resistant to chloride pitting, marine environments, acids, and harsh chemical processing.

Note: The "L" grade denotes low carbon content (C ≤ 0.03%), which prevents carbide precipitation during welding.

 

Q3: What welding methods are used for stainless steel welded pipes?

A: We primarily utilize:

TIG (GTAW): Ensures high-purity welds with smooth bead profiles, suitable for high-pressure and sanitary applications.

ERW / High-Frequency Welding: Delivers high production speed and excellent weld strength for structural and general industrial pipes.

PAW (Plasma Arc Welding): Used for thick-walled pipes requiring deep penetration.

 

Q4: How do you guarantee weld seam strength and pipe integrity?

A: Every pipe undergoes a rigorous quality control workflow, including:

100% Non-Destructive Testing (NDT): Ultrasonic Testing (UT) or Eddy Current Testing (ECT) along the weld line.

Pressure Testing: 100% Hydrostatic testing or pneumatic testing.

Material Verification: PMI (Positive Material Identification) chemical analysis and mechanical testing (Tensile, Yield, Flattening, and Bending tests).

 

Q5: What size ranges and wall thicknesses are available?

A: We supply welded pipes across a broad dimensional range:

Outer Diameter (OD): 6 mm to 1828.8 mm (1/8" to 72" NB).

Wall Thickness (WT): 0.5 mm to 50 mm (SCH 5S to SCH 80S / SCH 160).

Length: Standard 6m (20ft) or custom cut-to-length options up to 12m.

 

Q6: Can welded pipes be used in pressure applications instead of seamless pipes?

A: Yes. Modern automated welding technologies combined with post-weld solution annealing and 100% NDT inspection ensure that the weld seam joint efficiency reaches 1.0 (100% equivalent to base metal strength). Welded pipes offer better wall thickness uniformity and lower costs compared to seamless pipes of the same size.

 

Q7: What certificates and third-party inspection reports do you provide?

A: We provide full traceability documentation with every shipment:

EN 10204 3.1 Material Test Certificate (MTC) detailing chemical composition and mechanical test results.

EN 10204 3.2 Certificate (upon request for third-party witnessed testing).

Third-Party Inspection (TPI): Fully compliant with SGS, BV, Intertek, or Lloyd's Register inspections.

 

Q8: How are stainless steel welded pipes packaged for international ocean freight?

A: To prevent scratch damage, corrosion, or deformation during long-distance shipping:

Ends are fitted with protective plastic caps.

Outer surfaces are wrapped in woven plastic bags or waterproof bundles.

Heavy/large-diameter pipes are packed into seaworthy wooden crates or steel-framed boxes.

We're professional stainless steel welded pipe manufacturers and suppliers in China, specialized in providing high quality customized service. Be free to wholesale stainless steel welded pipe in stock here and get free sample from our factory. For price consultation, contact us.

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