Stainless Steel 904L Seamless Pipes Manufacturer in India

What are Stainless Steel 904L Seamless Pipe?

Stainless Steel 904L Seamless Pipes are high-alloy austenitic stainless steel pipes developed for demanding corrosive environments where enhanced resistance to acids, chlorides and localized corrosion is required. The grade contains high levels of chromium, nickel, molybdenum and copper, providing excellent corrosion resistance in a wide range of aggressive process conditions.

Manufactured without a longitudinal weld seam, Stainless Steel 904L Seamless Pipes provide uniform construction for demanding pressure and process piping systems. Their high nickel and molybdenum content contributes to resistance against pitting and crevice corrosion, while the low carbon content helps reduce the risk of sensitization during welding and thermal exposure.

Stainless Steel 904L Seamless Pipes are used in chemical processing plants, pharmaceutical equipment, petrochemical facilities, pollution control systems, heat exchangers, marine applications and other industries where high corrosion resistance is important. They are available in different outside diameters, wall thicknesses, schedules, and lengths according to applicable standards and project requirements.

Kamal Steels is a Stainless Steel 904L Seamless Pipes Manufacturer & Stockist in India, supplying SS 904L Seamless Pipes in standard and customized sizes, schedules, wall thicknesses and lengths. Products can be supplied with applicable testing, inspection, material certificates and documentation according to customer and project specifications.

stainless steel 904L seamless pipe specifications

Table of Contents

Stainless Steel 904L Seamless Pipe Specifications

Specification Details
Product Name Stainless Steel 904L Seamless Pipe
Grade SS 904L / UNS N08904
UNS N08904
EN Grade 1.4539
Material Type Super Austenitic Stainless Steel
Manufacturing Process Seamless
Product Standard ASTM A312
ASME Specification ASME SA312
Size Range 1/8" NB to 24" NB and above as required
Schedule SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160 and XXS
Wall Thickness As per ASME B36.19M or customer specification
Length Single Random Length, Double Random Length and Fixed Length
End Type Plain End, Bevelled End and Threaded End
Surface Finish Pickled & Passivated, Annealed, Bright Annealed and Polished
Heat Treatment Solution Annealing followed by Rapid Cooling
Testing Hydrostatic Test, PMI Test, Ultrasonic Test, Flattening Test and Flaring Test
Inspection Third Party Inspection Available as per project requirement
Certification EN 10204 3.1 Material Test Certificate (MTC)
Packaging Bundles, Wooden Cases, Wooden Boxes, Plastic End Caps and Export Packing

Stainless Steel 904L Seamless Pipe Size Chart

NPS / Size Outside Diameter (OD) Common Use
1/8" 10.3 mm Instrumentation and small bore piping
1/4" 13.7 mm Utility and process lines
1/2" 21.3 mm Chemical and industrial piping
3/4" 26.7 mm Process equipment connections
1" 33.4 mm Fluid transfer systems
1 1/4" 42.2 mm Industrial process piping
1 1/2" 48.3 mm Chemical processing applications
2" 60.3 mm Pressure and process piping
3" 88.9 mm Industrial plant piping
4" 114.3 mm Refinery and chemical systems
6" 168.3 mm Large process piping systems

SS 904L Seamless Pipes are manufactured according to international dimensional standards including ASME B36.19M. Available dimensions may vary according to pipe schedule, pressure requirements, application conditions, and customer specifications.

Stainless Steel 904L Seamless Pipe Weight Chart

The weight of Stainless Steel 904L Seamless Pipes depends on outside diameter, wall thickness, nominal pipe size and schedule. Heavy wall schedules provide increased pressure handling capability but result in higher weight per metre compared with light wall pipes.

NPS / Size SCH 10 Weight (kg/m) SCH 40 Weight (kg/m) SCH 80 Weight (kg/m)
1/2" 0.63 0.84 1.10
3/4" 0.80 1.12 1.48
1" 1.01 1.40 1.81
1 1/4" 1.28 1.79 2.35
1 1/2" 1.45 2.16 2.86
2" 1.92 2.99 3.93
3" 3.05 4.70 6.39
4" 4.38 6.47 8.63
6" 7.31 10.75 14.32

The above SS 904L Seamless Pipe weights are approximate theoretical values. Actual supplied weight can vary depending on manufacturing tolerances, dimensional standards, wall thickness variation and production conditions.

Stainless Steel 904L Seamless Pipe Schedule Chart

Stainless Steel 904L Seamless Pipe schedules define the wall thickness and pressure carrying capability of the pipe. Selection of the correct schedule depends on operating pressure, temperature, fluid characteristics and applicable piping design standards. SS 904L pipes are available in various schedules including light wall, standard wall and heavy wall options for critical industrial applications.

Schedule Wall Type Typical Use
SCH 5S Light Wall Low-pressure chemical and utility applications
SCH 10S Light Wall General process piping and corrosion-resistant services
SCH 40S Medium Wall Industrial process lines and plant piping systems
SCH 80S Heavy Wall Higher pressure applications and demanding services
SCH 160 Extra Heavy Wall High-pressure and critical process applications
XXS Double Extra Heavy Wall Extreme pressure and severe service applications

SS 904L Seamless Pipe schedule availability may vary depending on pipe size, manufacturing standards and project requirements. Kamal Steels supplies SS 904L Pipes as per ASTM, ASME and customer-specific requirements.

ASTM A312 TP904L Seamless Pipe

ASTM A312 TP904L Seamless Pipe is a super austenitic stainless steel pipe specification designed for applications requiring outstanding corrosion resistance and long-term reliability. TP904L contains higher amounts of nickel, chromium, molybdenum and copper, which provide excellent resistance against sulfuric acid, phosphoric acid, chloride environments and various aggressive chemicals.

ASTM A312 TP904L Seamless Pipes are manufactured using a seamless process and are solution annealed to improve corrosion resistance, mechanical properties and structural stability. These pipes are widely used in chemical processing plants, pharmaceutical industries, offshore applications, refineries, marine systems, heat exchangers and pollution control equipment.

Kamal Steels supplies ASTM A312 TP904L Seamless Pipes in different sizes, schedules, wall thicknesses, lengths and surface finishes. Each pipe can be supplied with Material Test Certificates, third-party inspection and export-quality packaging as per customer requirements.

SS 904L vs SS 316L Pipe

Stainless Steel 904L and Stainless Steel 316L are both corrosion-resistant austenitic stainless steel grades used for industrial piping applications. However, SS 904L is a higher alloy material containing increased nickel, chromium, molybdenum and copper content, which provides superior resistance against aggressive chemicals, acids and chloride environments compared with SS 316L.

SS 316L is widely selected for general chemical processing, food, pharmaceutical and marine applications, while SS 904L is preferred for highly corrosive environments such as sulfuric acid processing, offshore plants and specialized chemical industries where extended service life is required.

Feature SS 904L SS 316L
Material Type Super Austenitic Stainless Steel Austenitic Stainless Steel
Corrosion Resistance Excellent resistance against aggressive acids and chlorides Good corrosion resistance for general applications
Nickel Content Higher nickel content (23–28%) Typically 10–14%
Molybdenum Content Higher molybdenum content for improved pitting resistance Approximately 2–3%
Copper Addition Contains copper for improved acid resistance No significant copper addition
Chloride Resistance Superior resistance in chloride environments Good chloride resistance
Cost Higher due to alloy content Generally more economical
Typical Applications Chemical plants, acid processing, offshore and severe corrosion applications Food, pharmaceutical, marine and general process industries

The selection between SS 904L and SS 316L depends on operating conditions, corrosion environment, temperature, pressure and project requirements. SS 904L is selected when higher corrosion resistance and longer service performance are required.

SS 904L Seamless Pipe vs Welded Pipe

The main difference between Stainless Steel 904L Seamless Pipe and Welded Pipe is the manufacturing process. Seamless pipes are produced from solid billets without any longitudinal welding joint, whereas welded pipes are manufactured by forming stainless steel plates or strips and joining the edges through welding.

SS 904L Seamless Pipes are generally preferred for critical applications involving high pressure, high temperature and severe corrosion conditions. Welded pipes can be suitable for large diameter applications and systems where welding standards and inspection requirements are acceptable.

Feature SS 904L Seamless Pipe SS 904L Welded Pipe
Manufacturing Process Manufactured from solid billet without welding seam Manufactured by forming and welding stainless steel strip
Weld Seam No longitudinal weld seam Contains welded joint
Strength Uniform structure and high pressure capability Depends on weld quality and inspection
Pressure Service Suitable for demanding pressure applications Used where permitted by design specifications
Surface Finish Smooth internal and external surface Weld area may require additional finishing
Cost Generally higher due to manufacturing process Usually more economical for large quantities
Applications Chemical processing, offshore, pressure piping and critical services General industrial piping and fabrication applications

Stainless Steel 904L Seamless Pipe Chemical Composition

Stainless Steel 904L Seamless Pipes contain high levels of chromium, nickel, molybdenum, and copper. This alloy composition provides excellent resistance to pitting, crevice corrosion, and a wide range of aggressive chemical environments. The low carbon content also helps reduce the risk of sensitization during thermal exposure.

Element Composition (%)
Carbon 0.020 max.
Chromium 19.0 - 23.0
Nickel 23.0 - 28.0
Molybdenum 4.0 - 5.0
Copper 1.0 - 2.0
Manganese 2.00 max.
Silicon 1.00 max.
Phosphorus 0.045 max.
Sulfur 0.035 max.

The chemical composition of SS 904L Seamless Pipes should be verified against the applicable ASTM or ASME specification and the material test certificate supplied with the product.

Stainless Steel 904L Seamless Pipe Mechanical Properties

Stainless Steel 904L Seamless Pipes provide good tensile strength, yield strength, elongation, and toughness for demanding corrosion-resistant piping applications. The combination of high nickel, chromium, and molybdenum contributes to reliable performance in aggressive process environments.

Mechanical Property Minimum Requirement
Tensile Strength 490 MPa
Yield Strength 220 MPa
Elongation 35%

Actual mechanical properties may vary according to the applicable product specification, pipe dimensions, heat-treatment condition, and testing requirements. Final values should be confirmed against the relevant standard and material test certificate.

Stainless Steel 904L Seamless Pipe Applications

Stainless Steel 904L Seamless Pipes are used in applications where high resistance to aggressive chemicals, acids, chlorides, and localized corrosion is required. Their high-alloy composition makes them suitable for demanding process and fluid-handling systems.

Application Typical Use
Chemical Processing Corrosive chemical process piping and fluid handling.
Pharmaceutical Equipment Corrosion-resistant process and fluid piping systems.
Petrochemical Equipment Process piping exposed to aggressive process media.
Heat Exchangers Corrosion-resistant heat-transfer systems.
Pollution Control Equipment Equipment exposed to corrosive gases and process fluids.
Marine Applications Piping and equipment exposed to chloride-containing environments.
Industrial Process Systems High-corrosion-resistance piping for demanding service conditions.

Industries Using Stainless Steel 904L Seamless Pipes

Stainless Steel 904L Seamless Pipes are used across industries that require enhanced corrosion resistance in aggressive chemical and process environments. The high-alloy composition makes Grade 904L suitable for applications where conventional stainless steel grades may not provide sufficient corrosion resistance.

Industry Typical Applications
Chemical Industry Corrosive chemical processing and process piping.
Petrochemical Industry Process piping and corrosion-resistant equipment.
Pharmaceutical Industry Process and fluid-handling systems.
Oil & Gas Industry Selected corrosive process and utility applications.
Marine Industry Chloride-exposed piping and equipment.
Power Generation Industry Selected corrosion-resistant process systems.
Pollution Control Industry Flue gas and corrosive process equipment.

Kamal Steels supplies Stainless Steel 904L Seamless Pipes in different sizes, schedules, wall thicknesses and lengths according to customer and project requirements.

Frequently Asked Questions

SS 904L Seamless Pipes are high-alloy austenitic stainless steel pipes manufactured without welded joints. They provide exceptional resistance to corrosion, acids, chlorides and pitting.

They are commonly used in chemical processing, oil and gas, marine engineering, desalination plants, pharmaceutical industries and heat exchanger systems.

The UNS designation of Stainless Steel 904L is UNS N08904.

Yes. SS 904L offers higher nickel and molybdenum content, providing significantly better resistance to chlorides, sulfuric acid and pitting corrosion than SS 316L.

We supply SCH 5, SCH 10, SCH 20, SCH 40, SCH 80, SCH 80S, SCH 120, SCH 160 and XXS.

Outside diameters range from 6 mm OD to 914.4 mm OD with sizes up to 24" NB available.

Yes. Every shipment includes Mill Test Certificates (EN 10204 3.1) and complete quality documentation.

Yes. We provide single random, double random and custom cut lengths as per customer specifications.

Yes. Kamal Steels exports Stainless Steel 904L Seamless Pipes worldwide with export-quality packaging and prompt delivery.

We offer premium-quality ASTM A312 SS 904L Seamless Pipes, competitive pricing, ready stock, third-party inspection, fast delivery and dedicated technical support.