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Girgaon, Mumbai - 400004
Stainless Steel 316H Seamless Pipes
Stainless Steel 316H Seamless Pipes Manufacturer in India
Stainless Steel 316H Seamless Pipes are high-carbon austenitic stainless steel pipes designed for elevated temperature and high-pressure applications. Compared to standard SS 316 and low-carbon SS 316L grades, Stainless Steel 316H offers improved creep strength and enhanced mechanical performance at higher operating temperatures. These properties make ASTM A312 TP316H Seamless Pipes suitable for critical industrial processes where long-term strength and corrosion resistance are essential.
Manufactured without a welded seam, SS 316H Seamless Pipes provide superior structural integrity, uniform wall thickness and excellent pressure-handling capability. The addition of molybdenum improves resistance to pitting and crevice corrosion, while the higher carbon content helps maintain strength in elevated temperature environments. These characteristics make TP316H pipes a preferred choice for refineries, petrochemical plants, power generation facilities, heat exchangers, boilers and process piping systems.
Kamal Steels is a leading Stainless Steel 316H Seamless Pipes Manufacturer and Stockist in India, supplying ASTM A312 TP316H Pipes in various sizes, schedules and wall thicknesses. Our inventory includes Schedule 10S, Schedule 40S, Schedule 80S and custom thickness pipes with Mill Test Certificates (MTC), inspection reports and worldwide export supply.
Table of Contents
- What are Stainless Steel 316H Seamless Pipes?
- ASTM A312 TP316H Pipe Specifications
- SS 316H Pipe Dimensions & Sizes
- SS 316H Chemical Composition
- SS 316H Mechanical Properties
- Equivalent Grades
- Manufacturing Process
- Features & Benefits
- SS 316H Seamless vs Welded Pipes
- Applications of Stainless Steel 316H Pipes
- Industries Using TP316H Seamless Pipes
- Pipe Schedule & Weight Chart
- Available Types of SS 316H Pipes
- Testing & Inspection
- Packaging & Export Supply
- Factors Affecting SS 316H Pipe Price
- SS 316H vs SS 316 vs SS 316L
- Common Mistakes When Selecting SS 316H Pipes
- Why Choose Kamal Steels?
- Frequently Asked Questions
What are Stainless Steel 316H Seamless Pipes?
Stainless Steel 316H Seamless Pipes are high-carbon austenitic stainless steel pipes manufactured without a welded seam and designed for elevated temperature and high-pressure service. Designated as ASTM A312 TP316H and UNS S31609, this grade contains a higher carbon content than standard SS 316 and SS 316L, providing improved creep strength and enhanced mechanical properties at elevated temperatures.
The seamless manufacturing process produces pipes from a solid billet, eliminating weld joints and creating a uniform structure throughout the pipe wall. This construction improves pressure resistance, reliability and overall performance in critical industrial applications where welded joints may be a concern. As a result, Stainless Steel 316H Seamless Pipes are widely specified for process piping systems operating under demanding temperature and pressure conditions.
SS 316H contains chromium, nickel and molybdenum, which provide excellent corrosion resistance against various chemicals, industrial fluids and corrosive environments. The addition of molybdenum improves resistance to pitting and crevice corrosion, while the higher carbon content enhances strength during continuous exposure to elevated temperatures.
ASTM A312 Pipe TP316H Seamless Pipes are commonly used in refineries, petrochemical plants, power generation facilities, chemical processing units, heat exchangers, boilers and pressure vessel systems. Their combination of corrosion resistance, high-temperature strength and long service life makes them suitable for critical industrial operations where durability and reliability are essential.
ASTM A312 TP316H Pipe Specifications
ASTM A312 TP316H Seamless Pipes are manufactured in accordance with international standards for high-temperature and corrosion-resistant applications. The specification covers seamless, welded and heavily cold-worked austenitic stainless steel pipes intended for industrial process piping systems. Stainless Steel 316H Seamless Pipes are available in various sizes, schedules and lengths to meet the requirements of refineries, petrochemical plants, power stations and chemical processing facilities.
| Specification | Details |
|---|---|
| Product Name | Stainless Steel 316H Seamless Pipes |
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP316H |
| UNS Number | S31609 |
| Pipe Type | Seamless |
| Outside Diameter | 1/8" NB to 24" NB |
| Wall Thickness | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160 & XXS |
| Length | Single Random, Double Random, Cut Length |
| End Type | Plain End, Beveled End, Threaded End |
| Form | Round, Square, Rectangular, Hydraulic |
| Manufacturing Process | Hot Finished / Cold Drawn Seamless |
| Standards Followed | ASTM, ASME, ANSI, DIN, EN, JIS |
| Inspection | MTC EN 10204 3.1, Third Party Inspection Available |
| Testing | Hydro Test, PMI Test, Flattening Test, Flaring Test, Eddy Current Test |
| Origin | India |
SS 316H Pipe Dimensions & Sizes
Stainless Steel 316H Seamless Pipes are available in a wide range of diameters, wall thicknesses and schedules to meet the requirements of high-temperature and pressure applications. ASTM A312 TP316H pipes are commonly supplied for use in refineries, petrochemical plants, power generation facilities and process industries where elevated temperature performance is required.
As a leading Stainless Steel 316H Seamless Pipe Manufacturer and Stockist, Kamal Steels supplies TP316H pipes in various sizes, schedules and lengths to suit industrial piping systems. The availability of multiple dimensions allows engineers and buyers to select the appropriate pipe based on pressure rating, flow requirements and operating conditions.
| Specification | ASTM A312 / ASME SA312 TP316H |
|---|---|
| Pipe Type | Seamless, Welded, ERW, EFW |
| Outside Diameter | 1/8" NB to 24" NB |
| Wall Thickness | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS |
| Length | Single Random, Double Random, Cut Length |
| End Type | Plain End, Bevel End, Threaded End |
Available Pipe Schedules
SS 316H pipes are manufactured in various schedules including SCH 5S, SCH 10S, SCH 20, SCH 40S, SCH 80S, SCH 120 and SCH 160. Higher schedules provide thicker walls and greater pressure handling capability, making them suitable for demanding industrial environments.
SS 316H Chemical Composition
Stainless Steel 316H is a high-carbon version of SS 316 developed for elevated temperature service. The increased carbon content improves creep strength and high-temperature mechanical performance, making ASTM A312 TP316H pipes suitable for heat exchangers, pressure vessels, refineries and power generation facilities.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 2.00 Max |
| Silicon (Si) | 0.75 Max |
| Phosphorus (P) | 0.045 Max |
| Sulfur (S) | 0.030 Max |
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | 10.00 – 14.00 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Iron (Fe) | Balance |
SS 316H Mechanical Properties
The mechanical properties of Stainless Steel 316H Seamless Pipes provide excellent strength, ductility and creep resistance at elevated temperatures. These characteristics make TP316H pipes suitable for high-pressure and high-temperature process applications.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa Min |
| Yield Strength | 205 MPa Min |
| Elongation | 35% Min |
| Hardness | 95 HRB Max |
| Density | 8.0 g/cm³ |
| Melting Range | 1375°C – 1400°C |
Equivalent Grades of Stainless Steel 316H Pipes
SS 316H is recognized under several international standards. The equivalent grades listed below help engineers and procurement teams identify compatible materials across different specifications and regions.
| Standard | Grade |
|---|---|
| ASTM / ASME | 316H |
| UNS | S31609 |
| EN | 1.4401 / 1.4436 |
| DIN | X5CrNiMo17-12-2 |
| JIS | SUS 316H |
| AFNOR | Z6CND17-11 |
Manufacturing Process of SS 316H Seamless Pipes
Stainless Steel 316H Seamless Pipes are manufactured using solid billets that are heated and pierced to form hollow shells. The pipes are then elongated, hot finished, heat treated and tested according to ASTM A312 requirements.
- Raw Material Inspection
- Billet Heating
- Rotary Piercing
- Hot Rolling / Extrusion
- Heat Treatment
- Straightening
- Dimensional Inspection
- NDT Testing
- Final Marking & Packing
SS 316H Seamless vs Welded Pipes
| Property | Seamless Pipe | Welded Pipe |
|---|---|---|
| Construction | No Weld Seam | Welded Joint Present |
| Pressure Resistance | Higher | Moderate |
| Strength | Excellent | Good |
| Cost | Higher | Lower |
| Applications | Critical Service | General Service |
Manufacturing Process of Stainless Steel 316H Seamless Pipes
Stainless Steel 316H Seamless Pipes are manufactured using a hot extrusion and piercing process without any welded joints. The seamless construction provides superior strength, uniform wall thickness and improved pressure handling capabilities, making these pipes suitable for critical high-temperature and high-pressure applications.
ASTM A312 TP316H Seamless Pipes are produced from solid stainless steel billets that undergo multiple forming, heat treatment and finishing operations to achieve the required dimensions, mechanical properties and corrosion resistance characteristics.
| Manufacturing Stage | Description |
|---|---|
| Raw Material Selection | High-quality SS 316H billets are selected and inspected. |
| Heating | Billets are heated to the required forging temperature. |
| Piercing | A hollow shell is formed through rotary piercing. |
| Hot Rolling | The hollow shell is elongated to the required dimensions. |
| Heat Treatment | Solution annealing improves mechanical properties and corrosion resistance. |
| Straightening | Pipes are straightened to meet dimensional tolerances. |
| Testing & Inspection | NDT and dimensional inspections are performed. |
| Marking & Packaging | Finished pipes are marked, packed and prepared for dispatch. |
The seamless manufacturing process eliminates weld-related defects and provides enhanced reliability for demanding applications such as refinery piping, boiler systems, heat exchangers, pressure vessels and petrochemical process lines.
Features & Benefits of Stainless Steel 316H Seamless Pipes
Stainless Steel 316H Seamless Pipes are widely used in industries requiring reliable performance under high temperatures, corrosive environments and demanding operating conditions. The higher carbon content of Grade 316H improves strength and creep resistance, making it particularly suitable for elevated temperature service.
ASTM A312 TP316H Seamless Pipes combine excellent corrosion resistance with superior mechanical properties, enabling long service life and reduced maintenance costs in critical industrial applications.
- Excellent corrosion resistance in chloride-containing environments
- Higher tensile and creep strength at elevated temperatures
- Seamless construction without welded joints
- Superior pressure handling capability
- Good oxidation resistance at high temperatures
- Excellent durability and long service life
- Suitable for refinery and petrochemical applications
- Excellent weldability and fabrication properties
- Reduced maintenance and replacement costs
- High dimensional accuracy and consistency
- Available in various schedules and sizes
- Complies with ASTM and ASME specifications
| Feature | Benefit |
|---|---|
| Higher Carbon Content | Improved strength and creep resistance at elevated temperatures |
| Molybdenum Addition | Enhanced resistance to pitting and crevice corrosion |
| Seamless Construction | Better structural integrity and pressure resistance |
| Excellent Heat Resistance | Reliable performance in high-temperature service |
| Dimensional Accuracy | Easy installation and fabrication |
SS 316H Seamless vs Welded Pipes
Stainless Steel 316H Pipes are available in both seamless and welded forms. While both types offer excellent corrosion resistance and high-temperature performance, their manufacturing methods, pressure capabilities and application suitability differ significantly.
ASTM A312 TP316H Seamless Pipes are manufactured from solid billets without a welded seam, whereas welded pipes are produced by forming and welding stainless steel plates or coils. The choice between seamless and welded pipes depends on operating pressure, temperature, project requirements and budget considerations.
| Parameter | SS 316H Seamless Pipe | SS 316H Welded Pipe |
|---|---|---|
| Manufacturing Method | Produced from solid billet without welds | Manufactured by welding plate or coil |
| Weld Seam | No weld seam | Contains longitudinal weld seam |
| Pressure Resistance | Higher | Moderate to High |
| Structural Integrity | Excellent | Good |
| High Temperature Service | Highly Recommended | Suitable for moderate conditions |
| Availability | Limited large sizes | Available in larger diameters |
| Cost | Higher | More Economical |
| Typical Applications | Refineries, power plants, critical process piping | General industrial and low-pressure systems |
When to Choose SS 316H Seamless Pipes?
- High-pressure process piping systems
- Elevated temperature applications
- Critical refinery and petrochemical services
- Steam lines and power generation projects
- Applications requiring maximum reliability
When to Choose SS 316H Welded Pipes?
- Lower-pressure piping systems
- Large diameter requirements
- Cost-sensitive projects
- Water treatment and utility services
- General industrial applications
Applications of Stainless Steel 316H Pipes
Stainless Steel 316H Pipes are widely used in high-temperature and corrosive service environments where strength, reliability and long-term performance are critical. The higher carbon content of Grade 316H improves creep strength and elevated temperature resistance, making it suitable for demanding industrial applications.
ASTM A312 TP316H Seamless Pipes are commonly selected for process piping systems handling steam, chemicals, hydrocarbons and high-temperature fluids. Their excellent resistance to corrosion, oxidation and pressure makes them a preferred choice across multiple industries.
- Refinery process piping systems
- Petrochemical processing plants
- High-temperature steam lines
- Power generation facilities
- Heat exchangers and condensers
- Pressure vessel connections
- Chemical processing equipment
- Offshore and marine installations
- Fertilizer manufacturing plants
- Desalination projects
- Industrial fluid transportation systems
- Boiler and superheater applications
| Application | Why SS 316H is Used |
|---|---|
| Refineries | Excellent resistance to high temperatures and corrosive process fluids |
| Petrochemical Plants | Reliable performance under pressure and elevated temperatures |
| Power Plants | Suitable for steam and boiler piping systems |
| Chemical Processing | Good resistance to aggressive chemicals and acids |
| Marine Systems | Enhanced resistance to chloride-induced corrosion |
| Heat Exchangers | Excellent thermal stability and oxidation resistance |
Why Industries Prefer TP316H Seamless Pipes
- Excellent performance at elevated temperatures
- Superior resistance to pitting and crevice corrosion
- High pressure handling capability
- Long service life in demanding environments
- Reduced maintenance and downtime
- Compliance with ASTM, ASME and international standards
Industries Using SS 316H Seamless Pipes
Stainless Steel 316H Seamless Pipes are widely used in industries requiring high-temperature strength, corrosion resistance and reliable performance under demanding operating conditions.
| Industry | Applications |
|---|---|
| Oil & Gas | Process piping and transmission lines |
| Petrochemical | High-temperature chemical processing systems |
| Refineries | Hydrocarbon and steam service piping |
| Power Plants | Boiler, superheater and steam pipelines |
| Chemical Processing | Corrosive fluid handling systems |
| Marine & Offshore | Saltwater and offshore piping systems |
| Fertilizer Plants | High-pressure process piping |
| Desalination Plants | Seawater treatment systems |
SS 316H Pipe Schedule & Weight Chart
Stainless Steel 316H Seamless Pipes are available in various schedules including SCH 10S, SCH 40S and SCH 80S. Pipe weight varies depending on outside diameter, wall thickness and schedule. Higher schedule pipes have thicker walls and greater weight per meter.
| Nominal Pipe Size | Schedule | Wall Thickness (mm) | Approx. Weight (kg/m) |
|---|---|---|---|
| 1" | SCH 40S | 3.38 | 2.50 |
| 2" | SCH 40S | 3.91 | 5.44 |
| 3" | SCH 40S | 5.49 | 11.29 |
| 4" | SCH 40S | 6.02 | 16.07 |
| 6" | SCH 40S | 7.11 | 28.26 |
Available Types of SS 316H Pipes
Stainless Steel 316H Pipes are available in various forms to meet different industrial requirements and project specifications.
- SS 316H Seamless Pipes
- SS 316H Welded Pipes
- SS 316H ERW Pipes
- SS 316H EFW Pipes
- SS 316H Round Pipes
- SS 316H Polished Pipes
- SS 316H Large Diameter Pipes
- SS 316H Custom Cut Length Pipes
Testing & Inspection of SS 316H Pipes
All Stainless Steel 316H Pipes undergo quality testing to ensure compliance with ASTM, ASME and customer specifications.
- PMI Testing
- Hydrostatic Testing
- Flattening Test
- Flaring Test
- Ultrasonic Testing
- Eddy Current Testing
- Dimensional Inspection
- Third Party Inspection
Packaging & Export Supply
SS 316H Seamless Pipes are packed using industry-standard export packaging methods to prevent damage during handling and transportation.
- Wooden Boxes
- Bundled Packing
- Plastic End Caps
- Export Worthy Packaging
- MTC & Inspection Documents
- Worldwide Shipping Support
Factors Affecting SS 316H Pipe Price
The price of Stainless Steel 316H Pipes depends on multiple technical and market-related factors.
- Raw Material Cost
- Pipe Size & Diameter
- Wall Thickness & Schedule
- Seamless or Welded Construction
- Quantity Required
- Testing Requirements
- Export Destination
SS 316H vs SS 316 vs SS 316L Pipes
| Property | SS 316 | SS 316L | SS 316H |
|---|---|---|---|
| Carbon Content | Standard | Low | High |
| Weldability | Good | Excellent | Good |
| High Temperature Strength | Good | Moderate | Excellent |
| Typical Service | General Industrial | Corrosive Applications | High Temperature Applications |
Common Mistakes When Selecting SS 316H Pipes
- Selecting SS 316H instead of SS 316L for welding-intensive applications
- Ignoring operating temperature requirements
- Choosing incorrect pipe schedule
- Overlooking corrosion conditions
- Not verifying ASTM and ASME specifications
Why Choose Kamal Steels?
Kamal Steels is a trusted manufacturer, stockist and exporter of Stainless Steel 316H Seamless Pipes supplying customers across India, the Middle East, Europe, Southeast Asia and other global markets.
We maintain ready stock of ASTM A312 TP316H Pipes in multiple sizes, schedules and wall thicknesses. All materials are supplied with Mill Test Certificates (MTC), inspection reports and complete traceability documentation.
- Since 1984
- ASTM & ASME Compliant Products
- Ready Stock Availability
- Competitive Pricing
- Worldwide Export Supply
- Technical Sales Support
Frequently Asked Questions About Stainless Steel 316H Seamless Pipes
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.