Stainless Steel 316L Welded Pipes

What is Stainless Steel 316L Welded Pipe?

Stainless Steel 316L Welded Pipe is a low-carbon austenitic stainless steel pipe manufactured by forming stainless steel strip or plate into a tubular shape and joining the longitudinal seam by welding. The grade contains chromium, nickel and molybdenum, which provide good corrosion resistance in a wide range of industrial and chemical environments.

The low carbon content of 316L helps reduce carbide precipitation during welding and supports good resistance to intergranular corrosion after welded fabrication. Its molybdenum content also provides better resistance to chloride-induced pitting and crevice corrosion than 304L stainless steel.

Kamal Steels is a Stainless Steel 316L Welded Pipe manufacturer, supplier and exporter in India, based in Mumbai. The company supplies 316L welded pipes in different sizes, schedules, wall thicknesses, lengths and finishes for industrial and international requirements.

The commonly specified pressure-piping designation is ASTM A312 TP316L / ASME SA312 TP316L, with UNS designation S31603. Pipes can be supplied with testing, inspection and material certification according to applicable project requirements.

Stainless Steel 316L Welded Pipes

Table of Contents

Stainless Steel 316L Welded Pipe Specifications

Stainless Steel 316L Welded Pipe is a low-carbon austenitic stainless steel pipe containing chromium, nickel and molybdenum. The addition of molybdenum provides improved resistance to pitting, crevice corrosion and chlorides compared with conventional 304 stainless steel, making 316L suitable for corrosive process and marine environments.

ASTM A312 TP316L is commonly specified for Stainless Steel 316L Pipe used in pressure, process and elevated-temperature applications. The low carbon content of 316L also reduces the risk of carbide precipitation during welding, making the grade suitable for welded fabrication and applications where good intergranular corrosion resistance is required.

Specification Details
Product Stainless Steel 316L Welded Pipe
Grade 316L
UNS Number S31603
ASTM Specification ASTM A312
ASME Specification ASME SA312
Material Type Low-Carbon Austenitic Stainless Steel
Pipe Type Welded
Nominal Size 1/8 NB to 48 NB and as required
Schedules SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS and others
Length Single Random, Double Random and Cut Length
End Preparation Plain End, Bevelled End, Threaded End and as required
Surface Finish Annealed & Pickled, Mill Finish, Bright Annealed and Polished
Testing Hydrostatic, Ultrasonic, PMI, Dimensional Inspection and other specified tests
Material Certificate EN 10204 3.1 Certificate available as required

Kamal Steels supplies Stainless Steel 316L Welded Pipes in standard and custom sizes, schedules, wall thicknesses and lengths. Pipes can be supplied with applicable inspection, testing and material documentation according to customer and project requirements.

Stainless Steel 316L Welded Pipe Chemical Composition

The chemical composition of Stainless Steel 316L provides its combination of corrosion resistance, weldability and mechanical performance. Chromium and nickel provide the basic austenitic stainless steel properties, while molybdenum improves resistance to pitting and crevice corrosion. The low carbon content helps reduce carbide precipitation during welding.

Element Composition (%)
Carbon (C) 0.030 max.
Manganese (Mn) 2.00 max.
Silicon (Si) 0.75 max.
Phosphorus (P) 0.045 max.
Sulfur (S) 0.030 max.
Chromium (Cr) 16.0–18.0
Nickel (Ni) 10.0–14.0
Molybdenum (Mo) 2.0–3.0
Nitrogen (N) 0.10 max.
Iron (Fe) Balance

The actual heat analysis should always be verified against the applicable ASTM specification and the material test certificate supplied with the pipe.

Stainless Steel 316L Welded Pipe Sizes, Dimensions & Wall Thickness

Stainless Steel 316L Welded Pipes are available in different nominal pipe sizes, outside diameters and wall thicknesses. The required dimensions are selected according to operating pressure, temperature, piping design, fabrication requirements and applicable project specifications.

Common schedules include SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160 and XXS, subject to pipe size and availability. Custom outside diameters, wall thicknesses and lengths can also be supplied for specific industrial requirements.

Nominal Pipe Size Outside Diameter Common Schedules
1/8 NB 10.3 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
1/4 NB 13.7 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
1/2 NB 21.3 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
1 NB 33.4 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
1 1/2 NB 48.3 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
2 NB 60.3 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
3 NB 88.9 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
4 NB 114.3 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S
6 NB 168.3 mm SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160
8 NB 219.1 mm SCH 10S, SCH 40S, SCH 80S, SCH 160
10 NB 273.1 mm SCH 10S, SCH 40S, SCH 80S, SCH 160
12 NB 323.9 mm SCH 10S, SCH 40S, SCH 80S, SCH 160
14 NB 355.6 mm SCH 10S, SCH 40S, SCH 80S
16 NB 406.4 mm SCH 10S, SCH 40, SCH 80
18 NB 457.2 mm SCH 10S, SCH 40, SCH 80
20 NB 508.0 mm SCH 10S, SCH 40, SCH 80
24 NB 610.0 mm SCH 10S, SCH 40, SCH 80

Kamal Steels supplies Stainless Steel 316L Welded Pipes in standard and custom sizes, schedules, wall thicknesses and lengths according to applicable standards and project requirements.

ASTM A312 TP316L Welded Pipe Dimensions & Tolerances

ASTM A312 TP316L Welded Pipes are manufactured with controlled dimensional requirements for outside diameter, wall thickness and length. Dimensional accuracy is important for pipe fit-up, welding, fabrication and installation.

Parameter Requirement
Outside Diameter Controlled according to the applicable ASTM A312 dimensional requirements and specified pipe size.
Wall Thickness Controlled according to specified nominal wall thickness and applicable standard requirements.
Length Available in standard random, double random or specified cut lengths.
Ovality Controlled to maintain acceptable roundness and dimensional consistency.
End Preparation Plain, bevelled or other specified end preparation.

Dimensional inspection can include outside diameter, wall thickness, length and other applicable measurements. Additional inspection requirements can be specified for critical process and pressure-piping applications.

Stainless Steel 316L Welded Pipe Pressure Rating

The pressure rating of Stainless Steel 316L Welded Pipe depends on pipe size, outside diameter, wall thickness, operating temperature, allowable stress and the applicable piping design code. The selected schedule and wall thickness must therefore match the actual design conditions.

Factor Effect on Pressure Design
Pipe Size Outside diameter is considered in pressure design calculations.
Wall Thickness Wall thickness directly affects pressure-carrying capacity.
Pipe Schedule Different schedules provide different nominal wall thicknesses.
Operating Temperature Allowable material stress varies with temperature.
Design Code The applicable piping code determines the pressure design calculation.
Corrosion Allowance Additional wall thickness may be required where applicable.

The final allowable working pressure should be established using the actual design pressure, temperature, pipe dimensions, material properties and applicable engineering code rather than using a generic pressure value.

Stainless Steel 316L Welded Pipe Equivalent Grades

Stainless Steel 316L is identified by different designations under international material standards. These designations help manufacturers, engineers and procurement teams identify the material for international projects and specifications.

Standard 316L Designation
ASTM 316L
ASME SA312 TP316L
UNS S31603
EN 1.4404
JIS SUS 316L

Equivalent designations should be verified against the required chemical composition, mechanical properties, product specification, manufacturing method and project requirements before accepting material substitution.

Stainless Steel 316L Welded Pipe Surface Finish

The surface finish of Stainless Steel 316L Welded Pipe is selected according to the application, fabrication process and required surface condition. Industrial piping commonly uses standard mill or annealed and pickled finishes, while specialized applications may require brighter or polished surfaces.

Surface Finish Description Typical Application
Annealed & Pickled Heat-treated and chemically cleaned surface. Chemical and process piping
Mill Finish Standard surface obtained during manufacturing. General industrial applications
Bright Annealed Bright and smooth surface produced by controlled annealing. Specialized process applications
Polished Mechanically finished surface with improved smoothness. Pharmaceutical and specialized applications

The required surface finish should be selected according to corrosion conditions, cleaning requirements, fabrication requirements and the final application. Kamal Steels can supply 316L Welded Pipes with specified surface conditions according to customer requirements.

Stainless Steel 316L Welded Pipe Applications

Stainless Steel 316L Welded Pipes are used where corrosion resistance, chloride resistance, weldability and hygienic surface requirements are important.

Application Typical Use
Chemical Processing Corrosive chemical process piping
Marine Systems Saltwater and marine process piping
Pharmaceutical Process and utility piping systems
Food Processing Hygienic process and fluid handling systems
Water Treatment Water, wastewater and corrosive fluid systems
Desalination Selected seawater and desalination systems
Oil & Gas Process and utility piping applications
Heat Exchangers Fluid circulation and process systems

The suitability of 316L should be evaluated according to the actual chemical environment, chloride concentration, operating temperature, pressure and applicable design requirements.

Industries Using Stainless Steel 316L Welded Pipe

Stainless Steel 316L Welded Pipes are used across industries where corrosion resistance, chloride resistance, welded fabrication and long-term service performance are required.

Industry Typical Use
Chemical Industry Corrosive process piping and chemical transfer systems
Pharmaceutical Industry Process, utility and hygienic piping systems
Food & Beverage Fluid handling and hygienic process lines
Oil & Gas Process and utility piping systems
Marine & Offshore Marine and chloride-containing service environments
Power Generation Selected process and utility piping applications
Water Treatment Water, wastewater and desalination systems
Petrochemical Corrosive process and utility piping

Kamal Steels supplies Stainless Steel 316L Welded Pipes from India for domestic and international industrial requirements. Pipes are available with different sizes, schedules, wall thicknesses, lengths, finishes, testing options and material documentation according to project requirements.

Frequently Asked Questions

Stainless Steel 316L Welded Pipe is a low-carbon austenitic stainless steel pipe containing molybdenum for enhanced corrosion resistance. It is widely used in applications where welding and resistance to corrosive environments are essential.

SS 316L has a lower carbon content (maximum 0.03%) than SS 316, which minimizes carbide precipitation during welding and provides better corrosion resistance in welded structures.

Our SS 316L Welded Pipes are manufactured according to ASTM A312, ASTM A358, ASTM A778, ASME SA312, and ASME B36.19M standards.

We supply SS 316L Welded Pipes from 1/8" NB to 24" NB in various schedules, wall thicknesses, and custom lengths to suit industrial applications.

They are widely used in chemical processing, pharmaceutical plants, marine engineering, food processing, petrochemical industries, water treatment plants, and offshore applications.

Yes. Their molybdenum content and low carbon composition provide excellent resistance to seawater, chlorides, and aggressive marine environments.

Each pipe undergoes Hydrostatic Testing, PMI, Radiographic Testing, Visual Inspection, Flattening Test, and Dimensional Inspection before dispatch.

Yes. Every Stainless Steel 316L Welded Pipe is supplied with EN 10204 3.1 Mill Test Certificates, and third-party inspection is available upon request.

Yes. We offer customized outside diameters, wall thicknesses, lengths, end preparations, and surface finishes according to customer specifications.

Kamal Steels offers premium-quality SS 316L Welded Pipes with certified materials, strict quality control, competitive pricing, ready stock, timely delivery, and reliable export services worldwide.