Stainless Steel

Stainless Steel 310 Pipe & Tube

High-Temperature Heat-Resistant 25Cr-20Ni Austenitic Stainless Steel Seamless, Welded & ERW Pipes and Radiant Tubes

Grade SS 310 / TP310 (UNS S31000, Werkstoff 1.4841, X15CrNiSi25-21, SUS 310) and SS 310S / TP310S (UNS S31008, Werkstoff 1.4845, X8CrNi25-21, SUS 310S)
Standard ASTM A312, ASME SA312, ASTM A213, ASME SA213, ASTM A358, ASME SA358, ASTM A249, 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 an internationally recognized manufacturer, stockist, and global supplier of high-temperature Stainless Steel 310 and 310S Pipes and Tubes (ASTM A312 TP310 / TP310S / UNS S31000 / UNS S31008 / Werkstoff 1.4841 / 1.4845). Grade 310 is a high-alloy austenitic stainless steel engineered with 24.0% to 26.0% Chromium and 19.0% to 22.0% Nickel, designed specifically for extreme high-temperature environments. It provides continuous oxidation and scaling resistance in air up to 1100°C–1150°C (2012°F–2102°F) and intermittent cyclic service resistance up to 1035°C (1895°F).

Our complete manufacturing range encompasses cold-drawn precision seamless pipes, automated TIG/plasma fusion-welded pipes, high-frequency ERW lines, and heavy-wall radiant furnace tubes manufactured strictly in accordance with ASTM A312, ASTM A358, ASTM A213, and Indian Boiler Regulations (IBR). Operating with a density of 7.75 g/cm³ (7750 kg/m³) and an ultimate tensile strength exceeding 515 MPa, SS 310/310S provides superior resistance to hot sulfidation, carburization, and thermal fatigue, serving critical installations across petrochemical cracker furnaces, burner pipes, fluidized bed coal combustors, thermal power steam boilers, and kiln recuperators.

  • Extreme Oxidation & Scaling Resistance: 25Cr–20Ni matrix forms a persistent, protective chromium oxide scale resistant to continuous temperatures up to 1150°C (2102°F).
  • Hot Corrosion & Sulfidation Defense: Superior resistance to moderately carburizing and sulfurous reducing atmospheres compared to standard 18-8 series stainless steels.
  • IBR & Pressure Vessel Certified: Available with statutory IBR Form III-A / III-D certifications for high-temperature steam superheaters and boiler tube banks.

Key Features

  • High-Temperature Scaling Resistance: 25% Chromium and 20% Nickel matrix prevents surface scaling up to 1150°C (2102°F).
  • Thermal Fatigue & Cyclic Resistance: Retains dimensional stability and resists thermal shock in cyclic heating-cooling operations.
  • Sulfidation & Carburization Defense: Superior resistance to hot sulfurous and moderately carburizing atmospheres over lower-alloy austenitic steels.
  • Indian Boiler Regulations (IBR) Certified: Approved under Form III-A and III-D for steam boilers, superheaters, and pressure vessels.
  • Mechanical Toughness: High elongation (≥40%) and low magnetic permeability with high impact resistance at elevated temperatures.
  • Surface Finishes: Available in pickled & passivated (No. 1), bright annealed (BA), electropolished, and mechanical polish finishes.

Product Specifications

Specification Parameter Standard Specification / Technical Value
Nominal Size Range (Seamless) 1/8" NB to 24" NB (6.00 mm to 609.6 mm OD) / Up to 1200 NB Custom
Nominal Size Range (Welded / ERW / EFW) 1/8" NB to 48" NB (6.00 mm to 1219.2 mm OD)
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 A358, ASTM A249, ASTM A376, ASTM A409, ASTM A813, ASTM A814
Manufacturing Methods Cold Drawn Seamless (CDS), Hot Finished Seamless, High-Frequency Induction ERW, Plasma/TIG 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 26,000 mm (26m)
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 TP310 (UNS S31000 / 1.4841) (%) ASTM A312 TP310S (UNS S31008 / 1.4845) (%)
Carbon (C, Max) 0.25 Max 0.08 Max
Chromium (Cr) 24.00 – 26.00 24.00 – 26.00
Nickel (Ni) 19.00 – 22.00 19.00 – 22.00
Manganese (Mn, Max) 2.00 2.00
Silicon (Si, Max) 1.50 1.50 (0.75 Max for some specs)
Phosphorus (P, Max) 0.045 0.045
Sulfur (S, Max) 0.030 0.030
Molybdenum (Mo, Max) 0.75 Max 0.75 Max
Iron (Fe) Balance Balance

Mechanical Properties

Mechanical Property ASTM A312 TP310 / TP310S Specified Limits Typical Production Values
Tensile Strength, Ultimate (Min) 515 MPa (75 ksi / 75,000 psi) 550 – 650 MPa
Yield Strength (0.2% Proof, Min) 205 – 215 MPa (30 ksi / 30,000 psi) 240 – 310 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 – 90 HRB (155 – 190 HBW)
Density & Melting Point Density: 7.75 g/cm³ (7750 kg/m³) Melting Range: 1400°C – 1450°C (2550°F – 2650°F)
Modulus of Elasticity 200 GPa (29 x 10⁶ psi) Electrical Resistivity: 720 nΩ·m
Thermal Expansion (0–100°C / 0–538°C) 15.9 µm/m·°C (0–100°C) 17.0 µm/m·°C (0–538°C)
Thermal Conductivity & Specific Heat 14.2 W/m·K at 100°C | 18.7 W/m·K at 500°C Specific Heat (0–100°C): 500 J/kg·K

Standards & Specifications

Standard Designation Governing Organization Scope & Product Description
ASTM A312 / ASME SA312 ASTM / ASME Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes (TP310 / TP310S)
ASTM A213 / ASME SA213 ASTM / ASME Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes (TP310 / TP310S)
ASTM A358 / ASME SA358 ASTM / ASME Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service
ASTM A249 / ASME SA249 ASTM / ASME Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
ASTM A376 / ASME SA376 ASTM / ASME Seamless Austenitic Steel Pipe for High-Temperature Central-Station Power Service
ASTM A409 / ASME SA409 ASTM / ASME Welded Large Diameter Austenitic Light-Wall Steel Pipe for Corrosive or High-Temperature Service
EN 10216-5 / DIN 17456 / 17458 European / German Standards Seamless Steel Tubes for Pressure Purposes (Grade 1.4841 / 1.4845 / X15CrNiSi25-21)
Indian Boiler Regulations (IBR) Central Boilers Board IBR Certified Steam and High-Pressure Stainless Steel Boiler Piping

Applications

Stainless Steel 310 and 310S heat-resistant pipes and tubes are utilized across major thermal, furnace, and petrochemical applications:

  • Petrochemical & Refinery Furnaces: Thermal hydrocracker tubes, catalytic reformer radiant coils, flare stacks, tube hangers, and radiant recuperator pipes.
  • Thermal Power Stations & Steam Boilers: High-temperature superheater tube banks, reheater pendants, coal gasifier internal components, and soot blower piping under IBR.
  • Industrial Heat Treatment Equipment: Annealing furnace radiant tubes, roller hearths, burner nozzles, muffle furnaces, and thermocouple protection sheaths.
  • Fluidized Bed Combustion (FBC): Combustor bed coils, cyclone separators, air preheater headers, and hot ash disposal piping.
  • Cement & Mineral Processing: Kiln inlet and discharge pipes, burner pipes, clinker cooler ductwork, and heat recovery cyclone piping.
  • Waste Incineration & Environmental Systems: Thermal oxidizers, municipal incinerator boiler tubes, and furnace ducting subjected to hot flue gases.

Frequently Asked Questions

Q1: What is the main metallurgical difference between SS 310 and SS 310S?
The difference is in the carbon concentration: SS 310 contains up to 0.25% Carbon for enhanced high-temperature creep strength, while SS 310S restricts Carbon to ≤0.08%. The lower carbon in 310S minimizes grain boundary carbide precipitation during welding and high-temperature service, reducing susceptibility to intergranular corrosion and embrittlement.

Q2: What is the maximum continuous working temperature for Stainless Steel 310 pipes?
Stainless Steel 310/310S pipes can operate continuously in air at temperatures up to 1100°C–1150°C (2012°F–2102°F) with minimal scaling. Under cyclic thermal conditions, the maximum recommended operating temperature is 1035°C (1895°F).

Q3: How does SS 310 perform in sulfur-bearing (sulfidation) environments?
Due to its high Chromium content (25%), SS 310 provides significantly better resistance to sulfurous oxidizing atmospheres than nickel-base alloys or standard 304/316 grades. However, in strongly reducing sulfurous gases (such as H2S), operating temperatures should be limited to prevent nickel-sulfide eutectic formation.

Q4: What certifications accompany Om Export India Pvt Ltd SS 310/310S pipes?
Every order is supplied with EN 10204 Type 3.1 / 3.2 Material Test Certificates, IBR Form III-A or Form III-D statutory documents, 100% Positive Material Identification (PMI) spectro analysis, 100% hydrostatic testing, and automated Eddy Current / Ultrasonic testing reports.

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