Stainless Steel 317L tube, otherwise referred to as UNS S31703, is a low-carbon molybdenum-bearing austenitic stainless steel tube. It is one of the grades of the SS seamless tube. It is known for its superior corrosion resistance, especially to pitting and crevice corrosion in chloride environments.
ASTM A213 317L Stainless Steel Seamless Tube Manufacturer in China
We, Zhejiang Xintongda Special Steel (XTD), are a leading China-based manufacturer and global supplier of high-performance Stainless steel 317L seamless tube. This tube is a low-carbon, molybdenum-alloyed austenitic tube. We manufacture this tube in compliance with the ASTM A213 standard. SS 317L tube offers enhanced resistance to chemical attack compared to standard grades. This tube contains 18–20% chromium, 11–15% nickel and 3-4% molybdenum, which provides better high-temperature strength. It has a minimum tensile strength of 515 MPa. This low-carbon (max 0.03%) version of 317 stainless steel prevents sensitisation during welding. This makes it better than its standard grade 317. 317L Stainless steel tubing is preferred for its exceptional pitting resistance in chloride environments and high-temperature stability. This makes it suitable for FGD systems, pulp bleaching, and chemical processing. We hold multiple international certifications and have an annual production capacity of 25,000 tonnes. Contact us directly to get premium quality UNS S31703 tubing at competitive pricing.
Our ASTM A213 317L SS seamless tube meets the following specifications:
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Standard
ASTM A213
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OD Range
6.35-257 mm
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Thickness
0.89-12.7 mm
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Length
≤ 22 m
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Technical Data
Technical Data
Steps Involved in Manufacturing 317L Stainless Steel Tubing
Being a trusted 317L stainless steel tube manufacturer, we make these tubes with high-quality solid billets. These billets are first heated and pierced to make a hollow shell. Then they are precisely cold-drawn or cold-rolled. These steps ensure that each tube has the right size and a smooth surface finish. Lastly, each tube is solution annealed at temperatures between 1040°C and 1120°C. This is followed by rapid quenching. We perform strict hydrostatic and non-destructive testing to ensure every tube is leak-proof. For details on our manufacturing process, please refer to our manufacturing page.
What are the Features of Alloy 317L Tubing?
317L stainless steel seamless tubing has 5 main features:
- Corrosion Resistance: The 317L stainless steel tube provides superior resistance to sulfuric, acetic, and phosphoric acids. The high molybdenum content (3-4%) prevents localised pitting and crevice corrosion in harsh chemical environments.
- High Strength: This tube maintains a minimum yield strength of 205 MPa even under heavy mechanical stress. This strength is due to its nickel-rich austenitic structure.
- Good Ductility: The 317L SS tubing remains highly formable due to the stable austenitic grain structure maintained during the manufacturing process. This allows it to be bent or coiled without cracking.
- Excellent Weldability: TP317L is easy to weld using standard fusion methods without losing its properties. It exists as a low-carbon alloy to prevent intergranular corrosion in the heat-affected zone after welding.
- High-Temperature Stability: The 317L stainless steel tubing performs reliably at elevated temperatures without losing its mechanical integrity. This stability exists because the alloy is designed to resist creep and oxidation better than the 304 or 316 grades.
What is the Equivalent Standard for 317L Stainless Steel?
317L stainless steel is globally known as UNS S31703, Werkstoff Nr. 1.4438 and JIS SUS317L. Other equivalent standards are explained in the table below.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 317L | S31703 | S31703 | 022Cr19Ni13Mo3 | SUS317L | X2CrNiMo19-14-4 | 1.4438 | 03X16H15M3 |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
In Which Industries is Stainless Steel 317L Seamless Tube Used?
317L stainless steel tube is used in 6 demanding industries like chemical & petrochemical, pulp & paper, power generation, food processing & pharmaceutical, marine & seawater, and oil & gas:
Chemical & Petrochemical Industry
This tube is used in heat exchangers and Flue Gas Desulfurisation (FGD) systems to handle acidic vapours. It provides the durability needed to resist the highly corrosive scrubbers used in environmental control.
Pulp & Paper Industry
The SS 317L tube is an important part of bleaching equipment where it comes into contact with strong alkaline and chlorine dioxide solutions. It keeps machines from breaking down during the tough chemical recovery cycles used by paper mills.
Power Generation
In power plants this tube is used in condenser systems and auxiliary piping exposed to corrosive cooling water.
Food Processing & Pharmaceutical
The tube's smooth internal surface keeps sensitive ingredients from contamination while they are being transported. It is resistant to strong cleaning agents. This maintains hygienic conditions during food and pharmaceutical manufacturing.
Marine & Seawater
The 317L stainless tube is used for piping systems on offshore platforms and desalination plants. It withstands the high salt content of seawater. This prevents the rapid pitting commonly seen in lower alloys.
Oil & Gas
In the oil industry, the tube is used in surface piping and corrosion-resistant tubing in chloride-rich environments. It is specifically chosen to handle "sour" environments containing hydrogen sulfide and high concentrations of chlorides.
Frequently Asked Questions
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What is a Stainless Steel 317L tube?
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Difference between Stainless Steel 317L and 317 tube?The difference between Stainless steel 317L and 317 tube is that SS 317L has a lower carbon content (max 0.03%) than SS 317 to resist corrosion after welding. SS 317 offers higher strength but risks intergranular corrosion.
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What is the heat treating temp, tensile strength and yield strength of SS 317L tube?The heat treatment for SS 317L tube is solution annealing at 1040–1120°C (1900–2050°F), not responsive to hardening. Tensile strength is 515 MPa minimum, and yield strength is 205 MPa min.