ASTM A312 TP316/316L Dual-Certified Stainless Steel Pipe

What are TP316/316L Dual-Certified Stainless Steel Tubes?

TP316/316L dual-certified stainless steel pipes comply with ASTM A312/ASME SA312 standards and simultaneously meet the requirements of both TP316 and TP316L grades. The carbon content is stably controlled within ≤0.035%–0.08%, with 16.0–18.0% chromium, 10.0–14.0% nickel, and 2.00–3.00% molybdenum. The tensile strength reaches ≥485 MPa (TP316L) / ≥515 MPa (TP316), and the PREN value is ≥32. These pipes combine the properties of both grades, undergo strict testing, and are supplied with authoritative certifications.

 

We provide TP316/316L dual-certified stainless steel pipes fully compliant with ASTM A312/ASME SA312 standards, available in both seamless and straight seam welded types. Specifications cover outer diameters from 1/8 inch (3.18 mm) to 48 inches (1219 mm), with wall thickness ranging from SCH 5S to SCH 160 and XXS series. Length options include 4–12 m random lengths, 15–24 ft single random lengths, or customized lengths upon request. Surface finishes include pickling and passivation, bright annealing, and mechanical polishing. We also support customization for special requirements such as ultra-thin walls (≤0.3 mm) and large diameters (≥φ610 mm).

Each batch undergoes hydrostatic testing at 1.5 times the design pressure, along with eddy current and ultrasonic non-destructive testing. Dimensional tolerances are strictly controlled within ±1% for outer diameter and ±10% for wall thickness. All products are supplied with EN 10204 3.1 Mill Test Certificates (MTC), along with third-party inspection reports from TÜV and SGS. Optional certifications from classification societies such as ABS, BV, and DNV-GL are also available, significantly improving procurement efficiency and reducing material selection costs.

 

ASTM A312 TP316/316L Stainless Steel Pipe Specification

Item	Specification
Material Grades	ASTM A312 / ASME SA312 TP316 & TP316L
UNS Designation	S31600 (316) / S31603 (316L)
EN Equivalent	1.4401 / 1.4404
Type	Seamless (SMLS) or Welded (ERW, EFW)
Common Schedules	SCH 10S, 40S, 80S, 160, XXS

 

Stainless Steel 316/316L Pipe Chemical Composition

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
316	Min	-	-	-	0	-	16.0	2.00	10.0	-
	Max	0.08	2.0	0.75	0.045	0.03	18.0	3.00	14.0	0.10
316L	Min	-	-	-	-	-	16.0	2.00	10.0	-
	Max	0.03	2.0	0.75	0.045	0.03	18.0	3.00	14.0	0.10

 

ASTM A312 TP 316/316L Pipes Mechanical Properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elong (% in 50mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
316	515	205	40	95	217
316L	485	170	40	95	217

 

ASTM A312 TP316L Pipe dimensions

NPS (Inches)	DN (mm)	Outside Diameter (OD)	Sch 5S (Wall)	Sch 10S (Wall)	Sch 40S (Wall)	Sch 80S (Wall)
1/8	6	10.3	-	1.24	1.73	2.41
1/4	8	13.7	1.24	1.65	2.24	3.02
3/8	10	17.1	1.24	1.65	2.31	3.20
1/2	15	21.3	1.65	2.11	2.77	3.73
3/4	20	26.7	1.65	2.11	2.87	3.91
1	25	33.4	1.65	2.77	3.38	4.55
1-1/4	32	42.2	1.65	2.77	3.56	4.85
1-1/2	40	48.3	1.65	2.77	3.68	5.08
2	50	60.3	1.65	2.77	3.91	5.54
2-1/2	65	73.0	2.11	3.05	5.16	7.01
3	80	88.9	2.11	3.05	5.49	7.62
4	100	114.3	2.11	3.05	6.02	8.56
6	150	168.3	2.77	3.40	7.11	10.97
8	200	219.1	2.77	3.76	8.18	12.70
10	250	273.0	3.40	4.19	9.27	12.70*
12	300	323.8	3.96	4.57	9.53	12.70*

 

ASTM A312 Pipe Tolerances

Feature	NPS Range	Tolerance
Outside Diameter (OD)	1/8" to 1-1/2"	± 0.4 mm
	1-1/2" to 4"	± 0.8 mm
	4" to 8"	+ 1.6 mm / - 0.8 mm
Wall Thickness	All Sizes	- 12.5% (The positive tolerance is limited by the weight tolerance)
Weight	All Sizes	+ 10% / - 3.5% (Bulk order)

 

 

316 vs. 316L Stainless Steel Pipe: Carbon Content

The primary difference between 316 and 316L stainless steel pipe is that 316L has lower carbon content, with a maximum of 0.03%, compared to 316's maximum of 0.08%. This "Low" carbon formula (the 'L') reduces chromium carbide precipitation during welding, improving corrosion resistance in welded pipes and preventing sensitization.

 

Applications

Oil & Gas: Subsea manifolds, flowlines, and offshore platforms.
Chemical Processing: Equipment for handling organic and inorganic acids.
Pharmaceutical: Clean-room piping and sanitary systems.
Marine: Fittings, heat exchangers, and coastal infrastructure.
Food & Beverage: High-chloride food processing (e.g., soy sauce, brines).

 

If you have project-specific requirements for 316L stainless steel tubing, we invite you to place an order. GNEE maintains a substantial inventory of our best-selling products for you to choose from. Available in both seamless and welded forms, our products can be customized to your specifications. For detailed chemical composition data or to request free samples, please contact our factory immediately. We offer competitive pricing and exceptional service.

Our products are packaged using waterproof paper and steel strapping, adhering to standard export packaging requirements for maritime transport and are suitable for various shipping methods; alternatively, packaging can be customized according to client specifications.
Packaging
Standard Export Packaging for Stainless Steel Plates
1. Polished surface finish; 2. Bundled packaging;