ASTM A312 TP304L Stainless Steel Welded Tube

TP304L welded stainless‑steel pipe is an ultra‑low‑carbon austenitic stainless steel. GNEE supplies ASTM A312 TP304L welded stainless‑steel pipes with intergranular‑corrosion resistance for chemical pipelines and food‑processing equipment. If you are looking for high‑quality TP304L stainless‑steel pipes, we can offer you professional procurement solutions.

Our ASTM A312 TP304L welded stainless‑steel pipes are produced by the ERW electric‑resistance welding process. Steel strips are rolled and formed, welded, and weld seams are ground, followed by solution annealing and pickling to obtain finished pipes. With a carbon content of ≤0.03%, the product effectively inhibits carbide precipitation after welding and reduces the risk of intergranular corrosion. The pipe features minimum tensile strength ≥485 MPa, 0.2% yield strength ≥170 MPa, and elongation after fracture ≥40%, delivering excellent tensile and yield mechanical properties.

The weld seams of these pipes are treated by grinding and solution annealing, with the weld‑defect detection rate controlled within 1%. The pipe surface is clean and free of scale. Compared with seamless pipes of the same specification, large‑diameter welded pipes can reduce procurement costs by 25%‑40%. They are suitable for mildly‑corrosive low‑pressure working conditions such as municipal water treatment, food processing, pharmaceutical purified‑water systems and environmental‑protection desulfurization.

GNEE Value‑added Services

1. Supports custom pipe processing including cut‑to‑length, beveling, chamfering and polishing to meet project assembly requirements.

2. Professional multi‑layer export‑protective packaging with customizable shipping marks to resist sea‑salt spray and rough long‑distance transportation.

3. Sample delivery for testing and flexible small‑batch trial orders are available to reduce procurement risks in the early‑stage of projects.

4. Provides technical support for material selection, assisting with material comparison and tolerance scheme confirmation to avoid improper‑selection mistakes.

ASTM A312 TP304L Pickled SS Pipe

ASTM A312 TP304L Welded SS Pipe

ASTM A312 TP304L Polished SS Pipe

Export Cases of ASTM A312 TP304L Welded Stainless Steel Pipes (GNEE)

Project Background:

Fluid‑transfer piping for a food‑processing plant in Thailand. Food‑grade weak‑acid medium requires clean pipe surfaces and sound weld integrity.

Supply Details:

TP304L ERW welded pipes, NPS2‑4", SCH40S, pickled finish. Pre‑beveled pipe ends. Complete mill test documents available, third‑party witness inspection acceptable. Sea‑shipping marks applied. Total weight:11 tons.

Project Outcome:

Smooth weld seams without defects. Good general‑corrosion resistance for food‑service conditions. Passed site acceptance.

 

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Specification of ASTM A312 TP304L Stainless Steel Welded Tube

ASTM A312 TP304L Stainless Steel ERW Pipe Chemical Composition:

Steel Grade	C	Si	Mn	Cr	Ni	Mo	S	P
TP304L	0,035	0,75	2	18 - 20	8 - 13	-	0,03	0,04

 

Physical & Mechanical Properties of ASTM A312 TP304L Welded Stainless Steel Pipes

Item	Value
Density	7.93 g/cm³
Melting Range	1400‑1450 ℃
Linear Expansion Coefficient (20‑100℃)	16.0×10⁻⁶ /℃
Thermal Conductivity (Room Temperature)	16.3 W/(m·K)
Electrical Resistivity (Room Temperature)	72 μΩ·cm
Tensile Strength	≥485 MPa
0.2% Yield Strength	≥170 MPa
Elongation after Fracture	≥40%

 

Dimensional Tolerances of ASTM A312 TP304L Welded Stainless Steel Pipes 

Item	Tolerance Description
OD ≤ 48.3 mm (NPS 1/8‑1½")	±0.40 mm
OD 48.3‑114.3 mm (NPS 2‑4")	±0.79 mm
OD 114.3‑219.1 mm (NPS 5‑8")	+1.59 /‑0.79 mm
Wall Thickness	‑12.5 % of nominal wall thickness; positive tolerance varies with NPS size. Weld zone is not subject to positive‑tolerance limits
Cut‑to‑length	0 ~ +6 mm

 

Surface Treatment Processes of ASTM A312 TP304L Welded Stainless‑Steel Pipes

Surface Treatment	Description	Appearance
Pickled	Nitric‑hydrofluoric acid passivation after solution annealing to remove scale and weld discoloration	Silver‑grey matte finish, free of oil and scale
Bright Annealed (BA)	Solution annealing under protective atmosphere without pickling	Bright silvery surface without oxide layer
Mechanical Polishing	Step‑by‑step grinding with abrasive belts, typical Ra 0.8‑3.2 μm	Matte‑to‑mirror smooth surface
Weld‑only Grinding	Grind weld seam flat while keeping pickled base surface	Smooth weld, pickled pipe body
Electro‑polishing	Electrochemical surface leveling to reduce roughness and improve corrosion resistance	High‑gloss mirror finish with passivated microstructure

Prices of ASTM A312 TP304L Welded Stainless Steel Pipes

Purchase Volume & Product Condition	Reference Unit Price (USD/kg)	Remarks
Large batch ≥10 tons, standard pickled welded pipe SCH40S	2.3‑3.2	Stock standard sizes, cost‑effective
Medium‑small batch 1‑10 tons, standard pickled welded pipe	3.2‑4.0	Including common cutting and beveling processing
Custom version: polished finish, special wall thickness, third‑party witness inspection	4.0‑4.5	Subject to nickel raw‑material fluctuation, price varies by 5%‑8%

Remarks: The above figures are for reference only. Actual prices are affected by specifications, wall thickness, surface finish, delivery requirements and nickel‑market fluctuations.

 

Applications of ASTM A312 TP304L Welded Stainless Steel Pipes

TP304L welded pipes feature a carbon content of ≤0.03 %, which restricts carbide precipitation after welding and avoids the risk of intergranular corrosion. They are mainly applied in municipal water treatment, food‑processing pipelines, pharmaceutical purified‑water systems, general low‑pressure chemical service, new‑energy fluid transmission and environmental‑protection desulfurization supporting pipelines. Suitable for mildly corrosive, clean and low‑pressure working conditions, large‑diameter welded pipes deliver outstanding cost‑advantages.

High‑pressure pipelines

 environmental‑protection desulfurization pipelines

food‑processing fluid pipes

If you need more details, let me know:

Do you need dimensional tolerances for a specific schedule?

Are you comparing it to TP316L or another grade?

Contact now

Quality control

Full‑process quality inspection covers from raw materials to finished products. PMI spectrometry is adopted to verify alloy composition. Multiple tests including dimensional measurement, hydrostatic test and tensile test are carried out to detect surface defects. Special‑purpose tests such as intergranular corrosion test and salt‑spray test can be performed upon request. Each batch of products is supplied with mill test certificates and third‑party SGS/TÜV test reports. Batch traceability is guaranteed to ensure compliance with ASTM standards and project acceptance requirements.

Chemical composition test

 diameter measurement

 wall‑thickness measurement

To learn more about our quality control process, please click the link below to view our product inspection videos, testing procedures, and inspection reports.

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high-quality packaging

We adopt multi‑layer export‑protective packaging. Protective end caps are fitted on pipe ends, and anti‑rust & moisture‑proof PE film is wrapped around pipes to block salt spray and dampness. The pipes are bundled firmly to prevent bumps and scratches during loading and unloading. Depending on order requirements, pipes are packed in plywood crates or fumigated wooden crates with internal positioning fixation to avoid abrasion caused by shaking in transit. Shipping marks including product specifications, batch numbers and destinations are printed on cases. Suitable for long‑distance sea and land transportation, our packaging effectively protects pipes from moisture, deformation and surface damage.

Moisture‑proof packaging

wooden crate fixation

 pipe end caps

FAQ

1.What are the differences between 304L stainless‑steel pipes and 316 ss pipes?

304L and 316 ss pipes differ primarily in chemical composition, with 316 containing 2% to 3% molybdenum for superior chemical and saltwater resistance, while 304L is a low-carbon version of 304 designed for better weld integrity.

2.What is the main difference between TP304L and regular 304 welded pipe?

3.Can TP304L welded pipes be used in seawater or high‑chloride environments?

Not recommended. TP304L has limited chloride‑resistance and is prone to pitting corrosion in seawater. 316L grade is suggested for high‑chloride conditions.

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