UNS S31600|1.4401|TP316 Seamless Stainless Steel Pipe

Seamless Stainless Steel TP316 Pipes (UNS S31600 / W.Nr. 1.4401) are premium-grade austenitic solutions engineered for exceptional mechanical strength and superior corrosion resistance in chloride-rich environments. As a premier manufacturer based in Wenzhou, China, XinZhe produces high-integrity seamless piping that strictly adheres to ASTM A312, ASTM A213, and ASME SA312 international standards.

Distinguished by its strategic Molybdenum content (2.0–3.0%) and high Nickel/Chromium ratio, our TP316 tubing provides significantly enhanced resistance to pitting and crevice corrosion compared to standard 304 grades. These pipes are indispensable for mission-critical applications in offshore oil & gas, chemical reactors, and pharmaceutical processing. Through advanced cold-drawing and precise solution annealing, XinZhe ensures every pipe maintains a stable austenitic microstructure and optimized durability for the most demanding global industrial needs.

"For applications involving extensive welding, we also provide TP316L (UNS S31603) with lower carbon content to prevent sensitization and maintain intergranular corrosion resistance."

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What Is Seamless Stainless Steel TP316 Pipe?

Premium Seamless Stainless Steel TP316 Pipe

Global Standard for Corrosion Resistance & High-Performance Applications

Product Overview

What is a Seamless Stainless Steel TP316 Pipe?

Seamless Stainless Steel TP316 Pipe (UNS S31600 / EN 1.4401) is a high-performance austenitic stainless steel pipe manufactured from a solid billet without any weld seams. This seamless structure eliminates weld defects, ensuring superior mechanical strength, pressure resistance, and long-term reliability.

Compared to TP304, TP316 contains 2–3% Molybdenum (Mo), significantly improving resistance to pitting corrosion, crevice corrosion, and chloride attack. It is widely recognized as the preferred material for marine, chemical processing, pharmaceutical, and high-purity industries.

Key Advantages of TP316 Stainless Steel Seamless Pipe

Excellent Chloride Corrosion Resistance Ideal for seawater, coastal, and high-salinity environments.
Seamless Structure for Maximum Integrity No weld seams = higher pressure tolerance and improved safety.
Superior High-Temperature Performance Enhanced creep resistance and tensile strength compared to 304/304L.
Full Traceability & Certification Each pipe is marked with heat number and supplied with EN 10204 3.1 MTC.
Hygienic & Smooth Surface Finish Non-porous and easy to clean, perfect for food, beverage, and medical systems.

Additional Information

To provide a comprehensive overview of this versatile material, here are the detailed technical specifications and performance data for 316 stainless steel.

Table 1: Chemical Composition of Stainless Steel 316

The composition of Stainless Steel 316 is carefully balanced to achieve its superior corrosion resistance and high strength.

Table 2: Typical Mechanical Properties of Stainless Steel 316

Stainless Steel 316 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.

Table 3: Typical Physical Properties of Stainless Steel 316

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :

Main Applications of TP316 Seamless Stainless Steel Pipe

Offshore & Marine Engineering Seawater pipelines, offshore platforms, desalination systems
Chemical & Petrochemical Industry Acid, alkali, and chloride handling pipelines
Pharmaceutical & Biotechnology Sterile and high-purity fluid systems
Energy & Power Plants Heat exchangers, condensers, boiler tubing

Quality Assurance & Inspection

To guarantee premium quality, all TP316 seamless pipes undergo strict inspection procedures:

Material Certification EN 10204 3.1 / 3.2 Mill Test Certificate (MTC)
Nondestructive Testing (NDT) Ultrasonic Testing (UT), Eddy Current Testing (ET), Hydrostatic Testing
Positive Material Identification (PMI) 100% chemical verification before shipment
Mechanical & Corrosion Testing Flattening, flaring, bending, and intergranular corrosion (IGC) tests
Third-Party Inspection Available SGS, BV, TÜV, Lloyd’s Register (LR)

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 515 MPa	≥ 205 MPa	≥ 35%	≤ 192 HBW

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
8.0 g/cm³	1375 - 1400 °C approx.	16.5 µm/m·°C (20-100°C)	16.3 W/m·K (20°C)	193 GPa	0.74 x 10⁻⁶ Ω·m (20°C)

Chemical Composition

Cr	Ni	Mo	P	S	Mn	Si	C
16.00 - 18.00	10.00 - 14.00	2.00 - 3.00	≤ 0.045	≤ 0.030	≤ 2.00	≤ 1.00	≤ 0.08

Size Tolerance Chart

Standard	OD(D)	Tolerance （MM)		Thickness(S)	Tolerance(MM)	Length	Tolerance
	MM	Common	High	MM			MM
ASTM A312	D ≤48.3	+0.4/-0.8		10.3 ≤73	+20%-12.5%		+6.0/0
	48.3 ≤114.30	±0.8		88.9 ≤457.2,t/D ≤5%	+22.5%/-12.5%
	114.3 ≤219.1	+1.6/-0.8		88.9 ≤457.2,t/D >5%	+15%/-12.5%
	219.1 ≤457.2	+2.4/-0.8		D ≥508, t/D≤5%,SMLS	+22.5%/-12.5%
	457.2 ≤660.4	+3.2/-0.8		D ≥508, t/D>5%,SMLS	+15%/-12.5%
	660.4 ≤863.6	+4.0/-0.8		D ≥508, WELD	+17.5%/-12.5%
	863.6 ≤1219.2	+4.8/-0.8
JIS 3459 Hot-Finished Smls Pipe	D ＜50	±0.51		S ＜4	±0.5
	D ≥50	±1.0%		S ≥4	±12.5%
JIS 3459 Cold-Finished	D ＜30	±0.3		S ＜2	±0.2
	D ≥30	±1.0%		S ≥2	±10.0%
JIS G3463 Hot-Finished Smls Pipe	100	+0.4/-0.8		D ＜100， S	/	D	+7/0
				D ＜100， 2≤S	+40%/0	D	+10/0
				D ＜100， 2.4≤S	+35%/0
				D ＜100， 3.8≤S	+33%/0
				D ＜100， 4.6≤S	+28%/0	D	+13/0
	100 ≤D	+0.4/-1.2		D>100, S ＜2	/
	120 ≤D			D>100 ， 2≤S	/	D	+15/0
	160 ≤D	+0.4/-1.8		D>100 ， 2.4≤S	+35%/0
	200 ≤D	+0.4/-2.4		D>100 ， 3.8≤S	+33%/0	D>50,7	+10/0
				D>100 ， 4.6≤S	+28%/0
JIS G3463 Cold-finished		+0.4/-0.8		D	+0.4/0
	60 ≤D	±0.3		D ≥2.0	+20%/0	D>50,7	+13/0
	80 ≤D	±0.4		D ≥40	+22%/0
	100 ≤D	+0.4/-0.6
	120 ≤D	+0.4/-0.8				D>50,10M	+15/0
	160 ≤D	+0.4/-1.2
	200 ≤D	+0.4/-1.6
GB/T 14975 冷拔(扎)钢管	D	±0.3	±0.1	所有壁厚，普通级PA	+12.5%/-10%
	12.7		±0.15
	38.1	±0.4	±0.3
	88.9	±0.9%	±0.4
	139.7		±0.8	所有壁厚，高级PC	±10%
	203.2		±1.1
	219.1		±1.6
	D ≥323.9		±0.5%
GB/T 14976 冷拔(轧)钢管	6	±0.2	±0.15	S ≤3	±12%(10% /0 高级PC)
	10 ≤D	±0.2	±0.2
	30 ≤D	±0.2	±0.3	S>3	+12.5%/-10%(10%/0 高级PC)
	50 ≤D	0.85%	0.75%
	D>219	0.9%	0.8%	Smin, all	+22%/0(+20%/0 高级PC)

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Send your Seamless Stainless Steel TP316 Pipe enquiry with grade, applicable ASTM/ASME standard and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.

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