UNS S31700|1.4449|TP317 Seamless Stainless Steel Pipe

Seamless Stainless Steel TP317 Pipes (UNS S31700 / W.Nr. 1.4449) are high-performance austenitic solutions specifically engineered for superior resistance to localized chemical attack and pitting in aggressive environments. As a premier manufacturer based in Wenzhou, China, XinZhe produces high-integrity seamless piping that strictly complies with ASTM A312, ASTM A213, and ASME SA312 international standards.

Distinguished by its increased Molybdenum (3% min) content, our TP317 tubing offers enhanced mechanical properties and superior corrosion resistance compared to standard 316 grades, particularly in acidic chloride environments and sulfur-bearing media. These pipes are indispensable for mission-critical applications in flue gas desulfurization (FGD), chemical reactors, and pulp and paper processing. Through advanced cold-drawing and precise solution annealing, XinZhe ensures every pipe maintains a uniform microstructure and optimized tensile strength for the most demanding industrial environments.

PREN ≈ 28-30 ,higher than TP316L PREN 24-25

Quantity:

Contact Now

What Is Seamless Stainless Steel TP317 Pipe?

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for TP317 stainless steel.

The composition of Stainless Steel 317 is carefully balanced to achieve its superior corrosion resistance and high strength.

Product Overview

Seamless Stainless Steel TP317 Pipe (UNS S31700 / EN 1.4449) is a high-alloy austenitic stainless steel pipe engineered for high-pressure and highly corrosive industrial environments.

Manufactured from a solid billet through a seamless process, TP317 pipes feature:

No longitudinal weld seams
Uniform wall thickness
Enhanced structural integrity
Higher pressure-bearing capacity

Compared to welded pipes, TP317 seamless pipes provide greater safety, reliability, and longer service life in critical applications.

High Molybdenum Content (≥ 3.0%)

Improves resistance to:

Pitting corrosion
Crevice corrosion
Chloride-induced attack

Upgraded Alternative to 316 / 316L

TP317 offers superior performance compared to standard 316 grades:

Better resistance to sulfuric and phosphoric acids
Improved durability in aggressive chemical environments

High Structural Reliability

Seamless construction eliminates weld defects, ensuring:

Higher allowable design pressure
Reduced failure risk in fluid systems

Excellent Fabrication & Weldability

Good ductility for bending and forming
Compatible with standard industrial welding methods

1. Superior Corrosion Resistance

Performs exceptionally well in:

Chloride-rich environments
Sulfuric acid systems
Phosphoric acid processing

2. High Pressure & Mechanical Strength

No weld seam weak points
Suitable for critical pipelines and pressure systems

3. Long Service Life

Reduced maintenance costs
Improved lifecycle performance in harsh conditions

Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for TP317 stainless steel.

Chemical Composition

The composition of Stainless Steel 317 is carefully balanced to achieve its superior corrosion resistance and high strength.

Cr	Ni	P	S	Mo	Mn	Si	C
18.00 - 20.00	11.00 - 15.00	≤ 0.045	≤ 0.030	3.00 - 4.00	≤ 2.00	≤ 1.00	≤ 0.08

Typical Mechanical Properties of Stainless Steel 317

Stainless Steel 317 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.

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

Typical Physical Properties of Stainless Steel 317

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

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
8.0 g/cm³	1398 - 1454 °C	16.6 µm/m·°C (20-100°C)	16.3 W/m·K (20°C)	193 GPa	0.74 x 10⁻⁶ Ω·m (20°C)

Size Tolerance Chart

Manufactured according to international standards:

ASTM A312
ASME SA312
JIS G3459
EN 10216-5
GB/T 14976

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)

Industrial Applications

TP317 seamless stainless steel pipes are widely used in:

Chemical & Petrochemical Industry

Acid transport systems, Reactors and pressure vessels

Pulp & Paper Industry

Bleaching equipment, Sulfite liquor handling

Marine & Offshore Engineering

Seawater cooling systems, Desalination plants

Textile Industry

Dyeing and chemical treatment systems

Food & Beverage Industry

Acidic processing pipelines, Hygienic fluid transfer systems

Manufacturing Process

The TP317 seamless pipe production process includes:

Billet Heating
Piercing (hollow tube formation)
Cold Drawing / Hot Finishing
Solution Annealing (≥1040°C, rapid quenching)
Straightening & Surface Finishing

Non-Destructive Testing (NDT)

PMI (Positive Material Identification), Eddy Current Testing (ET), Ultrasonic Testing (UT), Hydrostatic Pressure Testing

Mechanical Testing

Flattening Test, Flaring Test, Hardness Test

Corrosion Testing

Intergranular Corrosion (IGC) Test, Pitting Resistance Test

Frequently Asked Questions

Why Choose TP317 Seamless Pipe?

Ready to Request a Quotation?

Send your Seamless Stainless Steel TP317 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.

Recommend Products