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ASTM A312 TP317 Seamless Stainless Steel Pipes Supplier & Exporter in India

ASTM A312 TP317 Seamless Pipes are high molybdenum austenitic stainless steel pipes engineered for superior resistance to pitting and crevice corrosion in aggressive chemical and chloride environments.

Product Overview – ASTM A312 TP317 Seamless Pipes

ASTM A312 TP317 is a molybdenum-enriched stainless steel grade containing higher molybdenum content than 316. This increased molybdenum significantly enhances resistance to chloride-induced pitting and crevice corrosion.

Seamless construction ensures high pressure capacity, structural reliability, and uniform mechanical strength for critical industrial piping systems.

Standard, Grade & International Equivalents-ASTM A312 TP317 Seamless Pipe

Standard ASTM A312 / ASME SA312
Grade TP317
UNS S31700
EN 1.4449

ASTM A312 TP317 Seamless Pipe Specifications

Manufacturing Type : Seamless
Size Range : 1/8″ NB to 24″ NB
Schedules : 5S, 10S, 40S, 80S, 160, XS, XXS
Length : 6m, 12m, Custom Length
End Type : Plain End (PE), Beveled End (BE)
Testing : Hydrostatic Test, PMI,Ultrasonic Testing
Certification : EN 10204 3.1 / 3.2 MTC
Dimensional compliance: ASME B36.19M.

All specifications are in accordance of ASTM A312 / ASME SA312 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.

Chemical Composition of ASTM A312 TP317 Seamless Pipe

(As per ASTM specification)
ElementMax (%)
Carbon (C)0.08%
Manganese (Mn)2.00 %
Silicon (Si)1.00 %
Phosphorus (P)0.045 %
Sulfur (S) 0.030 %
Chromium (Cr)18.0 – 20.0 %
Nickel (Ni)11.0 – 15.0 %
Molybdenum (Mo):3.00 – 4.00%
Iron (Fe)Balance
Note: The higher molybdenum content (up to 4%) is the defining feature of SS 317.

Mechanical Properties of TP317 Seamless Pipes

PropertyMinimum Value
Tensile Strength≥ 515 MPa
Yield Strength≥ 205 MPa
Elongation≥ 35%

Corrosion Resistance Performance – Why Choose SS 317?

SS 317 seamless pipes provide:

🔸 Superior resistance to chloride pitting corrosion
🔸 Better crevice corrosion resistance than SS 316
🔸 Strong performance in sulfuric and phosphoric acid environments
🔸 Improved resistance in pulp and paper bleaching processes

When standard 316 is not sufficient, engineers often upgrade to 317 for enhanced durability.

Applications of ASTM A312 TP317 Seamless Pipes

  • 🔸Chemical processing equipment
  • 🔸Fertilizer plants
  • 🔸Petrochemical pipelines
  • 🔸Heat exchangers
  • 🔸Marine piping systems
  • 🔸Pollution control equipment

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Advantages of SS 317 Seamless Stainless Steel Pipes

Higher molybdenum for improved corrosion resistance Excellent strength and durability Suitable for aggressive chemical environments Good weldability and fabrication properties Long operational life in harsh conditions

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Frequently Asked Questions

– ASTM A312 TP317 Seamless Pipes

What is ASTM A312 TP317?
TP317 is a high molybdenum austenitic stainless steel seamless pipe grade offering improved corrosion resistance compared to 316.
What is the difference between SS 316 and SS 317?
SS 317 contains higher molybdenum (3–4%) compared to 316 (2–3%), providing superior resistance to pitting and crevice corrosion.
What is the UNS number of SS 317?
The UNS designation for TP317 is S31700.
Is SS 317 suitable for chemical processing?
Yes. SS 317 is commonly used in chemical plants and fertilizer industries due to its enhanced corrosion resistance.
Is SS 317 better than 316 for chloride environments?
Yes. The higher molybdenum content improves resistance to chloride-induced corrosion.
Do you supply SS 317 seamless pipes in India?
Yes. We supply and export ASTM A312 TP317 seamless stainless steel pipes from Mumbai with MTC certification.