Stainless Steel

Stainless Steel 316H Pipe & Tube

High-Carbon Molybdenum-Bearing Austenitic Stainless Steel Seamless, Welded & ERW High-Temperature Pipes

Grade SS 316H / TP316H (UNS S31609, Werkstoff 1.4919 / 1.4401 High Carbon, X6CrNiMo17-13, SUS 316H)
Standard ASTM A312, ASME SA312, ASTM A213, ASME SA213, ASTM A249, ASTM A358, ASTM A376, ASTM A409, ASTM A813, ASTM A814, 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 leading manufacturer, stockist, and global exporter of high-integrity Stainless Steel 316H Pipes and Tubes (ASTM A312 TP316H / UNS S31609 / Werkstoff 1.4919). Grade 316H is the high-carbon modification of molybdenum-bearing austenitic stainless steel, engineered with a controlled carbon content of 0.04% to 0.10%, 16.0% to 18.0% Chromium, 10.0% to 14.0% Nickel, and 2.0% to 3.0% Molybdenum. This higher carbon chemistry substantially increases creep rupture strength, mechanical load-bearing capacity, and high-temperature structural stability for continuous operations exceeding 500°C up to 800°C (932°F to 1472°F).

Our comprehensive manufacturing program encompasses cold-drawn precision seamless pipes, automated TIG/plasma-welded pipes, high-frequency ERW lines, and heavy-wall utility boiler tubes manufactured in strict accordance with ASTM A312, ASTM A376, ASTM A358, and Indian Boiler Regulations (IBR). Operating with a density of 8.00 g/cm³ and a melting point of 1400°C (2550°F), SS 316H combines the pitting and crevice corrosion resistance of molybdenum with excellent short- and long-term creep properties, making it an essential alloy for petroleum refineries, catalytic cracking furnaces, thermal power generation loops, and chemical process headers.

  • Elevated Creep Rupture Strength: High-carbon formulation (0.04%–0.10% C) delivers superior allowable stress and creep-rupture performance at sustained temperatures above 500°C compared to 316 and 316L.
  • Chloride & Halide Resistance: 2.0%–3.0% Molybdenum addition provides robust defense against localized pitting, crevice attack, and harsh chemical vapor corrosion.
  • IBR & Severe Pressure Certified: Supplied with statutory IBR Form III-A and III-D certifications for high-temperature utility boilers, steam headers, and superheater pendant loops.

Key Features

  • Elevated Creep & Stress Rupture Strength: High-carbon chemistry (0.04%–0.10% C) preserves structural integrity under prolonged thermal stresses up to 800°C.
  • Chloride Pitting Resistance: 2.0%–3.0% Molybdenum content protects against pitting and crevice corrosion in chloride-bearing environments.
  • Broad Operating Range: Performs reliably from cryogenic conditions (-196°C) up to continuous high-temperature service.
  • Indian Boiler Regulations (IBR) Certified: Approved under Form III-A and III-D for steam boilers and pressure vessel lines.
  • Fabrication & Formability: High elongation (≥40%) allows cold drawing, bending, and flaring without structural micro-cracking.
  • Versatile 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 100" NB (Outer Diameter: 6.00 mm to 2540.0 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 A376, ASTM A358, ASTM A249, 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 quenching; 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 Heavy-Duty 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 TP316H (%) UNS S31609 (%) DIN 1.4919 / X6CrNiMo17-13 (%)
Carbon (C) 0.04 – 0.10 0.04 – 0.10 0.04 – 0.08
Chromium (Cr) 16.00 – 18.00 16.00 – 18.00 16.00 – 18.00
Nickel (Ni) 10.00 – 14.00 10.00 – 14.00 11.00 – 14.00
Molybdenum (Mo) 2.00 – 3.00 2.00 – 3.00 2.00 – 2.50
Manganese (Mn, Max) 2.00 2.00 2.00
Silicon (Si, Max) 0.75 0.75 0.75
Phosphorus (P, Max) 0.045 0.045 0.035
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 TP316H Specified Limits Typical Production Values
Tensile Strength, Ultimate (Min) 515 MPa (75 ksi / 75,000 psi) 560 – 630 MPa
Yield Strength (0.2% Proof, Min) 205 MPa (30 ksi / 30,000 psi) 240 – 300 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: 8.00 g/cm³ (8000 kg/m³) Melting Point: 1400°C (2550°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) 15.9 µm/m·°C (0–100°C) 17.5 µm/m·°C (0–538°C)
Thermal Conductivity & Specific Heat 16.3 W/m·K at 100°C | 21.5 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 (TP316H / UNS S31609)
ASTM A213 / ASME SA213 ASTM / ASME Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes (TP316H)
ASTM A376 / ASME SA376 ASTM / ASME Seamless Austenitic Steel Pipe for High-Temperature Central-Station Power Service
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 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 1.4919 / X6CrNiMo17-13)
Indian Boiler Regulations (IBR) Central Boilers Board IBR Certified Steam and High-Pressure Stainless Steel Boiler Piping

Applications

Stainless Steel 316H high-temperature pipes and tubes are utilized across major thermal, chemical, and heavy process installations:

  • Petroleum Refining & Petrochemicals: Catalytic reformer furnaces, thermal cracking heaters, hydroprocessing piping loops, and flare gas stacks.
  • Thermal Power Plants & Utility Boilers: Superheater tube pendants, reheater coils, high-pressure steam distribution headers, and economizers under IBR.
  • Chemical Processing Infrastructure: High-temperature reactors, organic acid processing vessels, and heat recovery steam generators (HRSG).
  • Nuclear Power Facilities: Primary and secondary steam coolant circuits, elevated-temperature reactor piping, and heat rejection lines.
  • Process Heat Exchangers & Condensers: High-temperature shell-and-tube heat exchangers, vaporizers, and radiant coil assemblies operating above 500°C.
  • Marine & High-Temperature Exhausts: High-duty marine engine exhaust gas scrubbers, industrial gas turbine ducting, and piping systems exposed to saline atmospheres.

Frequently Asked Questions

Q1: What is the main difference between SS 316, SS 316L, and SS 316H?
The distinction lies in the carbon content: SS 316 contains up to 0.08% Carbon, SS 316L restricts carbon to ≤0.030% to avoid carbide sensitization during welding, and SS 316H has a controlled carbon range of 0.04% to 0.10%. The higher carbon in 316H imparts superior creep and tensile rupture strength at service temperatures exceeding 500°C.

Q2: Why is SS 316H preferred over SS 304H in severe high-temperature environments?
Both alloys offer elevated-temperature creep strength, but SS 316H includes 2.0% to 3.0% Molybdenum. This provides significantly greater resistance to pitting, crevice corrosion, and aggressive sulfurous or halogen-bearing vapors encountered in refinery cracking and flue gas applications.

Q3: Is post-weld heat treatment required for SS 316H pipes?
Due to its higher carbon content, welding 316H can lead to chromium carbide precipitation in the heat-affected zone (HAZ). For high-temperature creep services, this fine carbide dispersion is beneficial; however, if the pipe will be exposed to aqueous corrosive media during shutdowns, a full solution anneal (1040°C–1150°C) with water quenching is recommended.

Q4: What testing certifications are supplied with ASTM A312 TP316H pipes?
All orders include EN 10204 Type 3.1 / 3.2 Material Test Certificates, IBR Form III-A or 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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