ASTM A312 TP317L Stainless Steel Welded Square Tubing

ASTM A312 TP317L welded stainless steel square tube is a low-carbon, high-molybdenum austenite stainless steel pipe. Its rectangular cross-section design balances structural strength and space adaptability, cutting material consumption by over 30%. It is ideal for equipment supports and frame structures such as reactor supports and building curtain wall keels.

The ASTM A312 TP317L welded stainless steel square tubes we supply feature a stably controlled molybdenum content of 3.0%–4.0% and carbon content ≤0.03%. Their pitting resistance equivalent number (PREN) stands at approximately 27, around 12.5% higher than that of standard 316L, with a critical pitting temperature 40–50℃ superior. They deliver strong resistance to erosion from high-concentration chloride ions and organic acids.

Meanwhile, our ASTM A312 TP317L welded stainless steel square tubes adopt TIG welding for thin-wall specifications and ERW high-frequency welding for thick-wall ones. After solution annealing treatment, the tensile strength of welds matches that of base metal (≥515 MPa), with a narrow heat-affected zone (≤1 mm), which effectively eliminates weak spots prone to localized corrosion.

Why Choose GNEE?

We provide a range of surface finishing options, including pickling and passivation, brushing, mirror polishing, and solution annealing for stress relief.

ASTM A312 TP317L Pickled Welded Tube

ASTM A312 TP317L Polished Welded Tube

ASTM A312 TP317L Square Tube

If you need specific details, please let me know if you are looking for mechanical properties, chemical composition limits, or available pipe dimensions/schedules.

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TP317L Welded Square Tube Specifications

Chemical Composition of ASTM A312 TP317L Welded Tubing

Element	C≤	Si≤	Mn≤	P≤	S≤	Cr	Ni	Mo
TP317L	0.035	1.0	2.0	0.045	0.03	18.0–20.0	11.0–15.0	3.0–4.0

 

Physical and Mechanical Properties of ASTM A312 TP317L Welded Tubing

Property	Value
Density (g/cm³)	7.98
Melting Point (℃)	1398–1454
Coefficient of Linear Expansion (1/℃)	1.65×10⁻⁵ (20–100℃)
Maximum Service Temperature (℃)	Continuous: 800℃, Short-term Peak: 980℃
Tensile Strength (MPa)	≥515
Yield Strength (0.2% Offset, MPa)	≥205

 

Specification Examples of ASTM A312 TP317L Welded Tubing

Side Length (mm)	Wall Thickness (mm)	Theoretical Weight (kg/m)	Application Scenarios
50×50	3.0	4.32	Chemical Equipment Support Frames
100×100	5.0	14.7	Marine Platform Pipe Supports
200×200	8.0	47.3	High-Temperature Furnace S

 

Dimension Parameter Table for ASTM A312 TP317L Welded Square Steel Tubes

Parameter Category	English Details
Side Length Range	Standard square sizes in stock, non-standard square/rectangular sizes customizable
Wall Thickness Range	Light thin-wall, standard & heavy pressure-bearing wall thickness available, compatible with SCH schedule series
Standard Fixed Lengths	Standard industrial fixed lengths: 6m, 12m
Custom Machining	Cut-to-length service available; prefabricated beveled, chamfered, plain, threaded pipe ends optional

 

Dimensional Tolerance Details of ASTM A312 TP317L Welded Square Tubes

Inspection Item	Tolerance Requirement
Side length (outer sectional dimension)	Standard tolerance: ±0.75% of nominal side length; tight tolerance ±0.5% for precision orders
Wall thickness	Wall tolerance varies by NPS range: NPS 1/8~2½: +20%/-12.5% of nominal wall thickness; NPS3~18 (t/D≤5%): +22.5%/-12.5% of nominal wall thickness. The upper thickness limit does not apply to the weld zone
Diagonal deviation	Difference between two diagonal lengths of the same cross-section ≤0.8% of nominal side length
Straightness (bending degree)	Bending deflection ≤2 mm per meter, total overall bending ≤0.2% of total pipe length; ≤0.3 mm/m for precision orders

 

Price of ASTM A312 TP317L Welded SS Square Tubes

Purchase Specification & Batch	Price Range
Bulk spot order (≥5 tons, regular side length & wall thickness, basic pickled surface finish)	7.2~10.8 USD/kg
Small & medium-batch customized products (non-standard sizes, pre-beveled ends / brushed & polished finish)	11.2~14.6 USD/kg
Small trial purchase (<500kg)	15~17.5 USD/kg

The prices are for spot market reference only in 2026. Actual transaction prices are affected by purchase quantity, surface finishing processes, customized processing items and shipping terms.

 

Common Applications of ASTM A312 TP317L SS Square Tubing

1. Seawater Desalination / Coastal Marine Engineering

Circulating heat exchange pipelines for coastal desalination plants, seawater cooling delivery pipelines and process pipelines for offshore platforms

2. Fine Chemical and Petrochemical Industries

Pipelines for transporting organic acids including sulfuric acid, phosphoric acid and acetic acid

3. Pharmaceutical Clean Fluid Transmission

Purified water and sterile medicinal liquid conveying pipelines for pharmaceutical plants

4. Industrial Wastewater Treatment Facilities

Circulation pipelines for high-salinity and acidified industrial wastewater

If you need specific details such as dimensions, schedules (e.g., SCH 40, SCH 80), or manufacturing types (seamless vs. welded) for your project, let me know how I can help narrow it down.

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Export Cases

GNEE TP317L pipes serve corrosive working conditions in desalination, fine chemical and power plant desulfurization projects worldwide. Typical cases are listed below:

 

1.Saudi Coastal Seawater Desalination Heat Exchange Pipeline Project

We supplied 28 tons of thick-wall TP317L seamless pipes for high-chloride circulating systems. Higher molybdenum content greatly improves pitting resistance, cutting pipeline failure risks effectively and gaining repeat orders for follow-up expansion works.

2.Vietnam Coastal Power Plant FGD Slurry Pipeline Project

19 tons of cold-rolled TP317L pipes were applied for wet desulfurization slurry circulation lines. Special intergranular corrosion inspection guarantees stable operation under mixed corrosive media.

ASTM A312 TP317L Square Tubing

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Quality Inspection

Our factory strictly controls the whole production process of stainless steel square tubes in line with relevant ASTM standards. PMI spectrometers are adopted to verify material compositions right after raw materials are delivered to the plant. Finished products are inspected sequentially for outer diameter, side length and wall thickness to keep dimensional tolerances within precise ranges. Supplementary hydrostatic pressure tests and tensile mechanical performance tests are carried out meanwhile. Edges and surface scratches are checked manually with instrument assistance. All inspection data is archived, accompanied by material certificates and third-party test reports to realize full-process traceability and satisfy strict acceptance standards for export projects.

Chemical composition testing

outer diameter measurement

 wall thickness measurement

Click the link below to watch our product inspection videos and see how every stainless steel product is tested before shipment.

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Export-grade packaging

We customize complete export protective packaging for stainless steel square tubes. Plastic end plugs are installed at tube openings to block dust and resist bumps; each individual tube is wrapped with moisture-proof PE film to insulate against sea salt fog and water vapor during shipping. Multiple tubes are neatly bundled and secured, with rigid edge protectors fitted at corners to prevent scratches in loading and unloading. Entire batches are packed in fumigated solid wooden crates equipped with internal limit fixtures to avoid shifting during transit. Crates are clearly marked with specifications, batch numbers and destination details, fully suited for ocean freight transportation.

1.What is the difference between stainless steel grades 317 and 317L pipe?

Stainless steel grade 317L is a low carbon version of grade 317 stainless steel. It has the same high strength and corrosion resistance as 317 steel but can produce stronger welds due to the low carbon content.

2.What is 317 stainless steel pipe used for?

Typical applications include: Chemical Processing: 317 stainless steel is often used in the production of chemical reactors, heat exchangers, evaporators, and piping systems exposed to acids, solvents, and other corrosive chemicals.

3.Is 317L ss tube good?

317L has excellent corrosion resistance in a wide range of chemicals, especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion.

4.What are the key differences between 304 and 317 stainless steel pipe?

Grade 317 ss pipe is even more corrosion resistant than 304 or 316, since it includes more nickel in its composition. However, nickel is a very expensive material, so the addition makes it more expensive than the other two types.

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