ASTM A312 TP316L Seamless Stainless Steel Precision Tube

​​If you're looking for TP316L seamless stainless steel pipes with precise dimensions, smooth inner surfaces, and exceptional corrosion resistance, GNEE supplies high-quality TP316L seamless pipes. These pipes are made from ultra-low carbon austenitic stainless steel (16%-18% chromium, 10%-14% nickel, 2%-3% molybdenum), formed through cold rolling or cold drawing, and undergo precision surface polishing to achieve a surface roughness of Ra ≤ 0.8μm (even reaching mirror-like finish). After solution annealing, both inner and outer surfaces are smooth, free from oxide scale, scratches, or defects.​​

ASTM A312 TP316L seamless pipes support standard sizes from DN15 to DN600 (or 1/2 inch to 24 inches) and can be customized (e.g., special lengths or irregular shapes). Products include material certification (MTC), SGS test reports (verifying chemical composition/mechanical properties), and optional non-destructive testing (RT/UT) documentation.​

ASTM A312 TP316L seamless pipes  Specification

Specification	Description
Material Grade	TP316L / UNS S31603
Pipe Dimensions	OD: 18 mm, Wall Thickness: 1.5 mm, Length: 6000 mm
Surface Finish	Outer: Precision Polished, Smooth & Bright; Inner: Clean, Deburred
Tolerance	Wall thickness ±0.05 mm, Straightness ≤ 1 mm/6m
Standard	ASTM A312 / ASME SA312

 

Mechanical Properties:

Property	Typical Value
Tensile Strength	515 – 750 MPa
Yield Strength	205 – 310 MPa
Elongation at Break	≥ 40%
Hardness (HRB)	≤ 95
Density	8.0 g/cm³

 

Chemical Composition (Typical, %):

Element	C	Si	Mn	P	S	Cr	Ni	Mo
Content	≤0.03	≤0.75	≤2.0	≤0.045	≤0.03	16.0–18.0	10.0–14.0	2.0–3.0

 

Applications

Chemical and petrochemical pipelines

Marine equipment and seawater piping

Food and beverage processing

Pharmaceutical fluid systems

Heat exchangers and condensers

High-pressure fluid transport systems

 

What is the difference between TP316 and TP316L stainless steel pipes?

GNEE manufactures seamless steel pipes from ASTM A312 TP316/TP316L steel, with a manufacturing process that does not involve welding at any stage of production. Welded pipes should be manufactured using automated welding processes, and no welding wire should be added during the welding process.

TP316 has a higher maximum carbon content (≤ 0.08%) than TP316L (≤ 0.035%), therefore TP316L is a low-carbon version of 316. The lower carbon content in TP316L improves its corrosion resistance, making it less prone to carbide precipitation after welding.

TP316/TP316L steel pipes should undergo solution treatment, which involves heating the steel pipe and holding it at a temperature not lower than 1040°C (1900°F) for a sufficient time to allow all chromium carbides to be completely austenitized/dissolved.

 

Inspection & Tests
Visual examination, dimensional inspection, PMI chemical analysis, tensile test, flattening test, bend test, eddy-current test, etching test, radiographic examination (for welded pipes), intergranular corrosion test (upon request).

If you are looking for high-quality ASTM A312 TP316L seamless stainless steel pipe, GNEE is a trusted supplier with over 18 years of export experience. We are committed to helping our customers achieve high-performance piping solutions, ensuring consistent quality, precise dimensions, and highly competitive prices.

Minimum Order Quantity: Flexible, depending on size and finish
Delivery Time: Standard stock 7-15 days; expedited service available
Customization Services: Cutting, polishing, bending, and laser marking
Packaging: Moisture-proof safe wooden crates, pallets, or bubble wrap packaging