Stainless Steel 316H Seamless Pipes

What is Stainless Steel 316H Seamless Pipe?

Stainless Steel 316H Seamless Pipes are manufactured from austenitic stainless steel grade 316H, a high-carbon variant designed for applications where elevated-temperature strength and corrosion resistance are important. The addition of molybdenum provides improved resistance to chloride-containing and corrosive environments, while the higher carbon content helps support strength at elevated operating temperatures. The seamless construction makes these pipes suitable for demanding process and industrial piping systems where the applicable specification permits their use.

Kamal Steels supplies Stainless Steel 316H Seamless Pipes in different outside diameters, wall thicknesses, schedules, lengths and end configurations according to applicable standards and customer requirements. SS 316H seamless pipe is commonly specified for chemical processing, petrochemical, power generation, heat-transfer equipment, high-temperature process systems and other industrial applications requiring reliable performance. ASTM A312 TP316H and ASME SA312 options can be supplied with applicable testing, inspection and material documentation.

Stainless Steel 316H Seamless Pipe Specifications

Table of Contents

SS 316H Seamless Pipe Specifications

Specification Details
Product Name Stainless Steel 316H Seamless Pipe
Grade SS 316H / Type 316H
UNS S31609
EN Grade 1.4919
Material Type Austenitic Stainless Steel
Manufacturing Process Seamless
Product Standard ASTM A312
ASME Specification ASME SA312
Size Range 1/8" to 24" and above as required
Schedule 5S, 10S, 40S, 80S, 160 and other schedules
Wall Thickness As per applicable schedule or specified requirement
Length Random, Double Random or Fixed Length
End Type Plain End, Bevelled End or Threaded End as required
Surface Finish Pickled & Passivated, Annealed, Bright Annealed or Polished
Heat Treatment Solution Annealed and Rapidly Cooled as specified by the applicable standard
Testing Hydrostatic, PMI, Ultrasonic, Flattening, Flaring and other applicable tests
Inspection Third Party Inspection available as required
Certification EN 10204 3.1 / Material Test Certificate (MTC)
Packaging Bundles, Wooden Cases, Wooden Boxes, Plastic End Caps and Export Packing
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SS 316H Seamless Pipe Size Chart

Stainless Steel 316H Seamless Pipes are available in a broad range of nominal pipe sizes, outside diameters and wall thicknesses for different industrial piping requirements. The required size is selected according to flow requirements, operating pressure, temperature, design conditions and applicable piping standards.

Nominal Pipe Size Outside Diameter Common Schedules
1/2 Inch 21.3 mm SCH 5S, 10S, 40S, 80S
1 Inch 33.4 mm SCH 5S, 10S, 40S, 80S
2 Inch 60.3 mm SCH 5S, 10S, 40S, 40, 80S
3 Inch 88.9 mm SCH 5S, 10S, 40S, 80S
4 Inch 114.3 mm SCH 5S, 10S, 40S, 40, 80S
6 Inch 168.3 mm SCH 5S, 10S, 40S, 80S
8 Inch 219.1 mm SCH 10S, 40S, 80S, 160
10 Inch 273.0 mm SCH 10S, 40S, 80S, 160
12 Inch 323.9 mm SCH 10S, 40S, 80S, 80, 160

Other sizes and wall thicknesses can be supplied according to the applicable specification, drawing or customer requirement.

SS 316H Seamless Pipe Weight Chart

The weight of Stainless Steel 316H Seamless Pipe depends mainly on its outside diameter, wall thickness, nominal size, schedule and length. Accurate pipe weight information is useful for material estimation, transportation planning and project costing.

Pipe Size Schedule Wall Thickness Approx. Weight
1/2 Inch SCH 40S 2.77 mm As per applicable dimensional standard
1 Inch SCH 40S 3.38 mm As per applicable dimensional standard
2 Inch SCH 40S 3.91 mm As per applicable dimensional standard
4 Inch SCH 40S 6.02 mm As per applicable dimensional standard
6 Inch SCH 40S 7.11 mm As per applicable dimensional standard

Actual weight may vary according to the specified dimensions, tolerances, length and applicable manufacturing standard. Weight should therefore be confirmed from the dimensional specification before final procurement.

SS 316H Seamless Pipe Schedule Chart

The pipe schedule indicates the wall thickness range associated with a particular nominal pipe size. Stainless Steel 316H Seamless Pipes can be supplied in different schedules depending on pressure, temperature, mechanical and dimensional requirements.

Schedule Typical Application
SCH 5S Light-wall process and utility applications
SCH 10S General process and industrial piping
SCH 40S General industrial and process service
SCH 80S Higher-pressure and demanding service
SCH 160 Heavy-wall and higher-pressure applications

Schedule availability depends on nominal pipe size and applicable dimensional standards. The required wall thickness should be selected based on design calculations and project specifications rather than schedule designation alone.

ASTM A312 TP316H Seamless Pipe

ASTM A312 TP316H Seamless Pipe is manufactured from Type 316H austenitic stainless steel for specified corrosive and high-temperature service. The specification covers seamless, welded and heavily cold-worked austenitic stainless steel pipe for applications where corrosion resistance and suitable elevated-temperature properties are required.

SS 316H Seamless Pipe is identified by UNS S31609 and contains chromium, nickel and molybdenum as major alloying elements. The molybdenum addition contributes to improved resistance to localized corrosion compared with conventional chromium-nickel stainless steel grades.

Kamal Steels supplies ASTM A312 TP316H pipes in applicable sizes, schedules, lengths, finishes and inspection conditions according to customer and project requirements.

SS 316H Seamless Pipe Chemical Composition & Mechanical Properties

Stainless Steel 316H is an austenitic chromium-nickel-molybdenum stainless steel grade with a controlled higher carbon content than standard 316L. Its alloy composition contributes to corrosion resistance, strength and performance in suitable elevated-temperature applications.

Element Typical / Specified Range
Carbon (C) 0.04–0.10%
Chromium (Cr) 16.0–18.0%
Nickel (Ni) 10.0–14.0%
Molybdenum (Mo) 2.0–3.0%
Manganese (Mn) 2.00% max.
Silicon (Si) 1.00% max.
Phosphorus (P) 0.045% max.
Sulfur (S) 0.030% max.

Mechanical properties such as tensile strength, yield strength and elongation depend on the applicable product specification, dimensions and material condition. The applicable ASTM or ASME specification should be referred to for the required mechanical property values.

SS 316H Seamless Pipe vs Welded Pipe

Stainless Steel 316H Seamless and Welded Pipes are both used in industrial piping, but their manufacturing processes are different. Seamless pipe is produced from a solid billet, while welded pipe is manufactured from stainless steel strip or plate that is formed and joined along a seam.

Feature SS 316H Seamless Pipe SS 316H Welded Pipe
Manufacturing Produced from a solid billet Formed from strip or plate and welded
Longitudinal Weld No longitudinal weld seam Contains a welded seam
Typical Use Specified pressure and demanding process services Process, structural and general industrial services
Size Availability Available across applicable seamless pipe sizes Wide range of larger diameters and wall thicknesses

The appropriate product type should be selected according to pressure, temperature, corrosion conditions, dimensional requirements, applicable standard and project specifications.

SS 316H Seamless Pipe Applications & Industries

Stainless Steel 316H Seamless Pipes are used across industrial sectors where corrosion resistance, mechanical strength and suitable elevated temperature performance are required. Their chromium-nickel-molybdenum composition makes them suitable for selected process and demanding industrial environments.

Oil & Gas

Industry: Oil & Gas

Application: Process piping, utility lines, fluid transfer and plant service systems.

Chemical Processing

Industry: Chemical Processing

Application: Corrosive fluid handling, process lines and chemical transfer systems.

Petrochemical

Industry: Petrochemical

Application: Process piping, equipment connections and plant utility systems.

Power Generation

Industry: Power Generation

Application: High-temperature process piping and equipment service applications.

Pharmaceutical

Industry: Pharmaceutical

Application: Process piping, utility systems and corrosion-resistant fluid handling.

Marine & Offshore

Industry: Marine & Offshore

Application: Corrosion-resistant piping, seawater-related systems and offshore equipment.

Frequently Asked Questions

Stainless Steel 316H Seamless Pipe is a high-carbon version of SS 316 designed for elevated temperature service. It offers improved creep strength and high-temperature resistance compared to standard SS 316 and SS 316L grades.

SS 316H contains higher carbon content for improved high-temperature strength, while SS 316L has lower carbon content and is preferred for welding applications requiring enhanced corrosion resistance.

SS 316H Seamless Pipes are commonly manufactured according to ASTM A312, ASME SA312 and related international specifications.

TP316H Pipes are used in refineries, petrochemical plants, power stations, heat exchangers, boiler systems, offshore installations and chemical processing facilities.

Yes. SS 316H is specifically designed for elevated temperature service and offers better creep resistance and strength than standard SS 316 grades.

SS 316H Seamless Pipes are available in sizes ranging from 1/8" NB to 24" NB with various schedules including SCH 10S, SCH 40S and SCH 80S.

Common tests include PMI testing, hydrostatic testing, ultrasonic testing, eddy current testing, flattening tests and dimensional inspections.

Yes. SS 316H Pipes are generally supplied with Mill Test Certificates (MTC) and inspection reports to ensure traceability and quality compliance.

Equivalent designations include UNS S31609, ASTM A312 TP316H and JIS SUS316H depending on the applicable international standard.

Kamal Steels supplies ASTM A312 TP316H Seamless Pipes in various sizes, schedules and wall thicknesses with worldwide delivery and competitive pricing.