Stainless Steel

Stainless Steel 317L Pipe

High-Molybdenum Low-Carbon Austenitic Stainless Steel Seamless, Welded & ERW Corrosion-Resistant Process Pipes

Grade SS 317L / TP317L (UNS S31703, Werkstoff 1.4438, X2CrNiMo18-15-4, SUS 317L) & SS 317 (UNS S31700 / 1.4449)
Standard ASTM A312, ASME SA312, ASTM A213, ASME SA213, ASTM A269, ASME SA269, ASTM A249, ASTM A358, ASTM A376, ASTM A409, ASTM A813, ASTM A814, ASTM A554, ASME B36.19M, ASME B36.10M, EN 10216-5, DIN 17456 / 17458
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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, stockist, and global exporter of high-performance Stainless Steel 317L Pipes and Tubes (ASTM A312 TP317L / UNS S31703 / Werkstoff 1.4438). Grade 317L is a high-alloy, low-carbon austenitic stainless steel engineered with 18.0% to 20.0% Chromium, 11.0% to 15.0% Nickel, and an elevated 3.0% to 4.0% Molybdenum content. The significantly enhanced molybdenum and chromium formulation provides superior pitting resistance, higher crevice corrosion protection, and improved defense against chemical attack from sulfuric, phosphoric, and organic acids compared to standard 316/316L grades.

With an extra-low carbon limit (≤ 0.030% C), SS 317L is immune to intergranular chromium-carbide precipitation during fusion welding, eliminating the necessity for post-weld solution annealing in process plant fabrication. Manufactured strictly in compliance with ASTM A312, ASTM A213, ASTM A269, and ASME Section II pressure vessel codes, our SS 317L seamless and welded piping systems deliver high tensile strength (minimum 515 MPa / 75 ksi) and exceptional ductility (elongation ≥ 35%). These pipes and tubes provide reliable performance across flue gas desulfurization (FGD) scrubbers, pulp and paper chlorination stages, dye vats, chemical tankers, and high-chloride marine condenser systems.

  • Elevated Molybdenum Resistance: Formulated with 3.0%–4.0% Mo to deliver a high PREN value (≥ 29–31), resisting localized halide attack in marine and industrial acid environments.
  • Low-Carbon Sensitization Defense: Restricted carbon (≤ 0.030% C) prevents intergranular corrosion in the heat-affected zone (HAZ) of welded pipe connections.
  • Chemical & Scrubber Suitability: Resists boiling solutions of acetic, formic, citric, and sulfurous acids, making it an optimal selection for pollution control scrubbers and petrochemical reboilers.

Key Features

  • High Pitting Resistance Equivalent: 3%–4% Molybdenum gives a PREN of 29–31, preventing localized pitting in high-chloride solutions.
  • Intergranular Corrosion Resistance: Ultra-low carbon level (≤ 0.030% C) eliminates carbide sensitization in welded joints.
  • Acid Corrosion Durability: Exceptional resistance to phosphoric, sulfurous, acetic, and formic acids across varying temperatures.
  • Formability & Ductility: High elongation (≥35%) enables cold bending, expansion into tubesheets, flanging, and precision forming.
  • Indian Boiler Regulations (IBR) Certified: Approved under Form III-A and III-D for high-temperature and high-pressure steam boiler installations.
  • Clean Surface Finishes: Supplied in pickled & passivated, bright annealed (BA), electropolished, and mechanical polish (up to 600 Grit).

Product Specifications

Specification Parameter Standard Specification / Technical Value
Nominal Size Range (Seamless) 1/8" NB to 24" NB (Outer Diameter: 6.00 mm to 609.6 mm OD)
Nominal Size Range (Welded / ERW / EFW) 1/8" NB to 48" NB (Outer Diameter: 6.00 mm to 1219.2 mm OD / Custom to 100")
Wall Thickness & Schedules 0.30 mm to 50.0 mm (SCH 5S, SCH 10S, SCH 40S/STD, SCH 80S/XS, SCH 160, SCH XXS)
Governing Standards ASTM A312 / ASME SA312, ASTM A213, ASTM A269, ASTM A249, ASTM A358, ASTM A376, ASTM A409
Manufacturing Methods Cold Drawn Seamless (CDS), Hot Finished Seamless, High-Frequency ERW, TIG/Plasma Welded, LSAW
Heat Treatment & Delivery State Solution Annealed at 1040°C – 1150°C (1900°F – 2100°F) followed by rapid water quench; Bright Annealed (BA)
Standard Lengths Single Random Length (SRL), Double Random Length (DRL), Custom Cut Lengths up to 30,000 mm (30m)
End Configurations & Protection Plain Square Cut End (PE), Beveled End (BE 30°/37.5° per ASME B16.25), Threaded Ends with Protective Plastic Caps

Dimensions & Sizes

Nominal Pipe Size (NPS) Outside Diameter (OD mm / in.) Wall Thickness (WT mm / in.) Nominal Schedule Nominal Weight (kg/m) Nominal Weight (lb/ft)
1/2" NB 21.34 mm (0.840") 1.65 mm (0.065") SCH 10S 0.81 kg/m 0.54 lb/ft
1/2" NB 21.34 mm (0.840") 2.77 mm (0.109") SCH 40S / STD 1.29 kg/m 0.85 lb/ft
1/2" NB 21.34 mm (0.840") 3.73 mm (0.147") SCH 80S / XS 1.65 kg/m 1.09 lb/ft
3/4" NB 26.67 mm (1.050") 1.65 mm (0.065") SCH 10S 1.03 kg/m 0.69 lb/ft
3/4" NB 26.67 mm (1.050") 2.87 mm (0.113") SCH 40S / STD 1.71 kg/m 1.13 lb/ft
3/4" NB 26.67 mm (1.050") 3.91 mm (0.154") SCH 80S / XS 2.23 kg/m 1.48 lb/ft
1" NB 33.40 mm (1.315") 1.65 mm (0.065") SCH 5S 1.31 kg/m 0.88 lb/ft
1" NB 33.40 mm (1.315") 2.77 mm (0.109") SCH 10S 2.13 kg/m 1.43 lb/ft
1" NB 33.40 mm (1.315") 3.38 mm (0.133") SCH 40S / STD 2.54 kg/m 1.68 lb/ft
1" NB 33.40 mm (1.315") 4.55 mm (0.179") SCH 80S / XS 3.29 kg/m 2.17 lb/ft
1-1/4" NB 42.16 mm (1.660") 2.77 mm (0.109") SCH 10S 2.73 kg/m 1.83 lb/ft
1-1/4" NB 42.16 mm (1.660") 3.56 mm (0.140") SCH 40S / STD 3.44 kg/m 2.31 lb/ft
1-1/2" NB 48.26 mm (1.900") 2.77 mm (0.109") SCH 10S 3.16 kg/m 2.12 lb/ft
1-1/2" NB 48.26 mm (1.900") 3.68 mm (0.145") SCH 40S / STD 4.11 kg/m 2.72 lb/ft
1-1/2" NB 48.26 mm (1.900") 5.08 mm (0.200") SCH 80S / XS 5.49 kg/m 3.63 lb/ft
2" NB 60.33 mm (2.375") 2.77 mm (0.109") SCH 10S 3.99 kg/m 2.64 lb/ft
2" NB 60.33 mm (2.375") 3.91 mm (0.154") SCH 40S / STD 5.52 kg/m 3.66 lb/ft
2" NB 60.33 mm (2.375") 5.54 mm (0.218") SCH 80S / XS 7.60 kg/m 5.03 lb/ft
2-1/2" NB 73.03 mm (2.875") 3.05 mm (0.120") SCH 10S 5.35 kg/m 3.59 lb/ft
2-1/2" NB 73.03 mm (2.875") 5.16 mm (0.203") SCH 40S / STD 8.77 kg/m 5.89 lb/ft
3" NB 88.90 mm (3.500") 3.05 mm (0.120") SCH 10S 6.56 kg/m 4.34 lb/ft
3" NB 88.90 mm (3.500") 5.49 mm (0.216") SCH 40S / STD 11.47 kg/m 7.58 lb/ft
3" NB 88.90 mm (3.500") 7.62 mm (0.300") SCH 80S / XS 15.51 kg/m 10.26 lb/ft
4" NB 114.30 mm (4.500") 3.05 mm (0.120") SCH 10S 8.50 kg/m 5.62 lb/ft
4" NB 114.30 mm (4.500") 6.02 mm (0.237") SCH 40S / STD 16.32 kg/m 10.80 lb/ft
4" NB 114.30 mm (4.500") 8.56 mm (0.337") SCH 80S / XS 22.67 kg/m 15.00 lb/ft
6" NB 168.28 mm (6.625") 3.40 mm (0.134") SCH 10S 14.04 kg/m 9.30 lb/ft
6" NB 168.28 mm (6.625") 7.11 mm (0.280") SCH 40S / STD 28.69 kg/m 18.99 lb/ft
6" NB 168.28 mm (6.625") 10.97 mm (0.432") SCH 80S / XS 43.21 kg/m 28.60 lb/ft
8" NB 219.08 mm (8.625") 3.76 mm (0.148") SCH 10S 20.27 kg/m 13.62 lb/ft
8" NB 219.08 mm (8.625") 8.18 mm (0.322") SCH 40S / STD 43.20 kg/m 28.55 lb/ft
8" NB 219.08 mm (8.625") 12.70 mm (0.500") SCH 80S / XS 65.63 kg/m 43.39 lb/ft

Chemical Composition

Element ASTM A312 TP317L (%) UNS S31703 (%) DIN 1.4438 / X2CrNiMo18-15-4 (%)
Carbon (C, Max) 0.030 0.030 0.030
Chromium (Cr) 18.00 – 20.00 18.00 – 20.00 17.50 – 19.50
Nickel (Ni) 11.00 – 15.00 11.00 – 15.00 13.00 – 15.00
Molybdenum (Mo) 3.00 – 4.00 3.00 – 4.00 3.00 – 4.00
Manganese (Mn, Max) 2.00 2.00 2.00
Silicon (Si, Max) 0.75 (1.00 Max) 0.75 1.00
Phosphorus (P, Max) 0.040 (0.045 Max) 0.040 0.045
Sulfur (S, Max) 0.030 0.030 0.015
Nitrogen (N, Max) 0.10 0.10 0.10
Iron (Fe) Balance Balance Balance

Mechanical Properties

Mechanical Property ASTM A312 TP317L Specified Limits Typical Production Values
Tensile Strength, Ultimate (Min) 515 MPa (75 ksi / 75,000 psi) 560 – 620 MPa
Yield Strength (0.2% Proof, Min) 205 MPa (30 ksi / 30,000 psi) 240 – 290 MPa
Elongation in 2 in. / 50 mm (Min) 35% – 40% Min 45% – 55%
Hardness (Rockwell B / Brinell, Max) 95 HRB Max / 217 HBW Max 82 – 88 HRB (155 – 185 HBW)
Density & Melting Point Density: 8.00 g/cm³ (8000 kg/m³) Melting Point: 1454°C (2650°F)
Modulus of Elasticity 193 GPa (28 x 10⁶ psi) Poisson's Ratio: 0.28 – 0.30
Thermal Expansion (0–100°C / 0–538°C) 17.2 µm/m·°C (0–100°C) 18.4 µm/m·°C (0–538°C)
Thermal Conductivity & Specific Heat 16.2 W/m·K at 100°C | 21.5 W/m·K at 500°C Specific Heat (0–100°C): 500 J/kg·K
Electrical Resistivity 720 nΩ·m Creep Rupture Strength: High (> 500°C)

Standards & Specifications

  • High Pitting Resistance Equivalent: 3%–4% Molybdenum gives a PREN of 29–31, preventing localized pitting in high-chloride solutions.
  • Intergranular Corrosion Resistance: Ultra-low carbon level (≤ 0.030% C) eliminates carbide sensitization in welded joints.
  • Acid Corrosion Durability: Exceptional resistance to phosphoric, sulfurous, acetic, and formic acids across varying temperatures.
  • Formability & Ductility: High elongation (≥35%) enables cold bending, expansion into tubesheets, flanging, and precision forming.
  • Indian Boiler Regulations (IBR) Certified: Approved under Form III-A and III-D for high-temperature and high-pressure steam boiler installations.
  • Clean Surface Finishes: Supplied in pickled & passivated, bright annealed (BA), electropolished, and mechanical polish (up to 600 Grit).

Applications

Stainless Steel 317L high-molybdenum corrosion-resistant pipes and tubes are utilized across demanding chemical, marine, and process industries:

  • Flue Gas Desulfurization (FGD) Scrubbers: Wet scrubber absorber towers, spray headers, damper assemblies, and sulfur dioxide (SO2) flue gas ducting.
  • Chemical & Petrochemical Processing: Reactor circuits handling concentrated sulfuric, phosphoric, and organic acids, chemical tanker cargo piping, and distillation headers.
  • Pulp & Paper Mills: Bleaching plant chlorination stages, chlorine dioxide wash drums, pulp digestors, and liquor heating units.
  • Petroleum Refining: Overhead hydrocracker piping, crude distillation condensing loops, and acid gas scrubbing systems.
  • Pharmaceutical & Food Processing: Evaporators, processing tanks handling hot organic acids, and clean-in-place (CIP) distribution manifolds.
  • Textile & Dyeing Facilities: Dye vats, bleaching equipment, and chemical transfer systems exposed to high chloride and sulfur dyes.

Frequently Asked Questions

Stainless Steel 317L high-molybdenum corrosion-resistant pipes and tubes are utilized across demanding chemical, marine, and process industries:

  • Flue Gas Desulfurization (FGD) Scrubbers: Wet scrubber absorber towers, spray headers, damper assemblies, and sulfur dioxide (SO2) flue gas ducting.
  • Chemical & Petrochemical Processing: Reactor circuits handling concentrated sulfuric, phosphoric, and organic acids, chemical tanker cargo piping, and distillation headers.
  • Pulp & Paper Mills: Bleaching plant chlorination stages, chlorine dioxide wash drums, pulp digestors, and liquor heating units.
  • Petroleum Refining: Overhead hydrocracker piping, crude distillation condensing loops, and acid gas scrubbing systems.
  • Pharmaceutical & Food Processing: Evaporators, processing tanks handling hot organic acids, and clean-in-place (CIP) distribution manifolds.
  • Textile & Dyeing Facilities: Dye vats, bleaching equipment, and chemical transfer systems exposed to high chloride and sulfur dyes.

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