• Metallica is one of the biggest stainless steel 904L product supplier and manufacturer in India, with over 250 customers in India and overseas. We are bulk buyers and exporters of stainless steel 904L pipes, fittings and flanges from our factory in India, and are able to give you the best price and quality just in time.
  • We stock all major forms of stainless steel 904L grade such as SS 904L pipe and tube, SS 904L forged flange and fittings, SS 904L butt-welding pipe fittings, SS 904L elbow, SS 904L tee, SS 904L reducer, SS 904L stub end, gaskets, fasteners, valves, sanitary fittings etc. Being one of the largest volume stainless steel 904L supplier in Mumbai, we can guarantee you the lowest prices.
  • At Metallica Metals, we believe in selling in volume and increasing our customer base across the globe, enabling us to work on low margins. We have an extensive trader network across India and the Middle East, who buy from us on a regular basis.
  • In addition to traders, we have many EPC contractors, companies and end users in various industries as our customers for stainless steel. We are leading stainless steel 904L suppliers for various applications ranging from low/medium/high pressure or temperatures.
  • SS 904L supplier in Mumbai, UNS N08904 material Stockist, 1.4539 material dealers in India, Stainless Steel 904L Products suppliers, Stainless Steel 904L price per kg in India
Stainless Steel 904L Supplier, Manufacturer, Wholesaler in India and Overseas
  • Largest Stainless Steel 904L Products Supplier in India, with over 300 Tons in Stock

  • We Sell Stainless Steel 904L Products in Price Range of Rs. 200/KG to Rs. 600/KG.

  • Our Annual Sales Volume for Stainless Steel 904L Products is Over 1500 tons.

  • Stainless Steel 904L Pipes, are Sold with Complete Range of Related Pipe Fittings.

  • On-Time Delivery with Quality Assurance and Price Guarantee for Stainless Steel 904L.

Stainless Steel 904L Product Suppliers in India!

Product Stainless Steel 904L
Equivalents 904L, N08904, 1.4539, X1-Ni-Cr-Mo-Cu-25-20-5, SS 2562,
Items Pipe, Tubes, Tubing, Fittings, Flanges, Valves, Fasteners, Sheet, Square Bar, Threaded Bar, Plate, Hexagon Bar, Fasteners and Fixings, Round Bar, Flat Bar, Rebar, Angle, Tube & Pipe, Wire
  • Round Bars: OD – 4mm to 500mm
  • Bright Bars: OD – 4mm to 100mm
  • Hex Bars: 18mm – 47mm (11/16″ to 2-3/4″)
  • Square Bars: 18mm – 47mm (11/16″ to 1-3/4″)
  • Flats: 1/2″ to 10″ in thickness range of 2mm to 150mm
  • Pipes: 3/8 to 72″ NPS
  • Tubings: 1/8 to 6″
  • Pipe Fittings/Flanges/Valves: 1/2″ to 48″ NPS
  • Fasteners: Metric M1 to M152
Pipe Type Seamless, Welded, ERW, Fabricated, Custom Size Pipes
Specifications ASTM, ASME, DIN, GOST, JIS
Certification EN 10204 3.1
Fittings Type Butt Weld, Screwed & Socket Weld, Flanges, Instrumentation
Other Fittings Elbows, Tees, Reducers, Caps, Stub Ends, Flanges (ANSI, Table E, D and H), Nuts, Bolts, Screws, Threaded Bars

Full Range of Stainless Steel 904L Products

Stainless Steel 904L Pipes Stainless Steel 904L Seamless Pipes
Stainless Steel 904L Welded Pipes Stainless Steel 904L Square Pipes
Stainless Steel 904L Flanges Stainless Steel 904L Buttweld Fittings
Stainless Steel 904L Forged Fittings SS 904L Socket Weld Pipe Fittings
Stainless Steel 904L Threaded Fittings Stainless Steel 904L Fasteners
Stainless Steel 904L Nuts & Bolts Stainless Steel 904L U Bends & Tubes
Stainless Steel 904L Valves Stainless Steel 904L Tubes
Stainless Steel 904L Furnace Tubes Stainless Steel 904L Seamless Tubing
SS 904L Heat Exchanger Tubes Stainless Steel 904L Large Dia. Pipes
Stainless Steel 904L Boiler Tubes SS 904L High Pressure Pipes
Stainless Steel 904L Forgings SS 904L High Temperature Pipes

What is 904L Stainless Steel?

904L also known as UNS N08904 is an austenitic stainless steel group. It has high molybdenum and non-stabilised extremely low carbon content. Copper content in the alloy greatly improves resistance to strong reducing acids, especially (H2SO4) sulphuric acid. 904L has better resistance. Ti chloride attack against both stress corrosion cracking and crevice / pitting corrosion. This grade is non-magnetic in all conditions and has excellent weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures. 904L does have very substantial contents of the high cost ingredients nickel and molybdenum. Due to addition of Copper, it has increased resistance to phosphoric, sulphuric and hydrochloric acid concentration. It is sometimes referred to as super austenitic stainless steel due to superiority over other 300 series austenitic steel grades. 904L is also resistant to chloride and sea water attack. 904L is primarily used in production and transport of phosphoric acid as well as in environment containing concentrations of phosphoric acid or phosphorous gas.

What is the Difference Between Stainless Steel 904L and 316L?

904L is an austenitic grade stainless steel with low carbon and higher resistance to stress and crevice corrosion cracking as compared to AISI 316 & AISI 317 stainless steel grades.

SS 904L has low carbon content and copper has been added to it, to increase its resistance against strong reducing acids, like sulphuric acid. SS316L is a low carbon version of 316 and to this, molybdenum has been added, which gives it good resistance to corrosion. 1.4539 Stainless Steel displays superb resistance to chloride attacks and even warm seawater. SS316L shows very good resistance to corrosion in various corrosive media and atmospheric environments. But, though SS316L is considered to be a lower cost option, its resistance to corrosion is much lesser.

904L has greater amounts of chromium and nickel than the 316L grade. It is typically used in the chemical industry for severe corrosion Environments i.e better resistance to pitting, SCC, IGC etc. 316L Stainless steel is far less scratch resistant than the 904L because it has a much higher Rockwell hardness. The 316L has less nickel in it and is far brighter in appearance and tends to stay that way. Nickel can be an irratant. Many of the applications in which this grade has previously performed well can now be fulfilled at lower cost by duplex stainless steel 2205 (S31803 or S32205), so 904L is used less commonly than in the past.

Applications of 904L

  • Petroleum, petrochemical equipment, such as reactors in petrochemical equipment.
  • National defense
  • Nuclear industry
  • Aviation
  • Power generation
  • Wiring in electrostatic precipitators
  • Oil refinery components
  • Seawater cooling devices
  • Gas scrubbing plants
  • Pulp and paper processing industries
  • Acetic, phosphoric and sulphuric acid processing plants
  • Storage and transportation equipment for sulfuric acid, such as heat exchangers.
  • Power plant flue gas desulfurization device, the main use parts are: tower body of the absorption tower, flue, door panel, internal parts, sprinkler system, etc.
  • Washers and fans in organic acid treatment systems.

Properties and Processing Characteristics of Stainless Steel 904L


904L is a high-alloy austenitic stainless steel with a very low carbon content. The steel is designed for harsh environments. The alloy was originally developed for corrosion resistance in dilute sulfuric acid. This feature has been proven to be very successful after many years of practical application. The 904L is now standardized in many countries and has been approved for the manufacture of pressure vessels.
Like other commonly used CrNi austenitic steels, 904L alloy has good resistance to pitting corrosion and crevice corrosion, high resistance to stress corrosion cracking, good resistance to intergranular corrosion, good processability and Weldability. The maximum heating temperature for hot forging can reach 1180 degrees Celsius, and the minimum stop forging temperature is not less than 900 degrees Celsius. This steel thermoforming can be carried out at 1000–1150 degrees Celsius. The heat treatment process of the steel is 1100–1150 degrees Celsius, and is quickly cooled after heating.


Welding of grade 904L stainless steels can be performed using all conventional methods. This grade does not require pre-heat and post-weld heat treatments. Grade 904L can be subjected to hot cracking in constrained weldment. Grade 904L electrodes and rods are used for welding grade 904L steels according to AS 1554.6.

Types of 904L Stainless Steel

* Pipelines * Heat Exchangers * Pressure Vessels
* Flanges and fittings * Valves * Processing Equipment
* General Construction * Threaded Bar * Fasteners and Fixings
* Tube * Special Sections * Sheet and Plate
* U Channel * Flat Bar * Round Bar
* Hollow Bar * Angles * i Beam

Chemical, Mechanical and Physical Properties of 904L


Standard 904L
UNS N08904
Werkstoff Nr. 1.4539

ASTM Specifications

Alloy UNS Designation Werkstoff NR. Specifications*
904L 1.4539 N08904 ASTM B625, ASTM B649, ASTM B673, ASTM B674, ASTM B677, DIN 1.4539, ASTM A213, ASTM A269, ASTM A312, BS EN 10216 pt.5

Grade Specification Comparision

AISI UNS DIN / EN / Werkstoff Number Euronorm / DIN Name Swedish
904L N08904 1.4539 X1-Ni-Cr-Mo-Cu-25-20-5 SS 2562

Chemical Composition

Grade C Mn Si P S Cr Mo Ni Cu
904L min. 19 4 23 1
max. 0.02 2 1 0.045 0.035 23 5 28 2

904L Stainless Physical Properties

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Co-eff of Thermal Expansion (µm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Elec Resistivity (nΩ.m) Melting Point
904L 0-100°C 0-315°C 0-538°C At 20°C At 500°C
7900 190 15 11.5 500 952 1300-1390 ℃

Mechanical Properties

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
904L Rockwell B (HR B) Brinell (HB)
490 220 36 70-90 typical 150

Fabrication Data

Alloy 904L can be easily welded and processed by standard shop fabrication practices.

Hot forming

Working temperatures of 1562–2102°F (850–1150°C) are recommended for hot working processes. Normally hot working should be followed by a solution anneal and quench, but for 904L, if hot forming is discontinued at a temperature above 2012°F (1100°C) and the material is quenched directly thereafter, the material may be used without subsequent heat treatment. It is important that the entire workpiece be quenched from temperatures above 2012°F (1100°C). In the event of partial heating or cooling below 2012°F (1100°C), or if the cooling has been too slow, hot working should always be followed by a solution anneal and quenching. 904L should be solution annealed at 1940–2084°F (1060–1140°C).

Cold forming

Although higher forces are required, 904L will respond in a similar fashion to other austenitic stainless steels like 304, 316 or 317. Most common operations can be successfully performed


The cold work hardening rate of Alloy 904L makes it less machinable than 410 and 304 stainless steels.


1920-1990 F (1050-1090 C), rapid cooling.


This alloy does not respond to heat treatment. It may only be hardened by cold reduction.

Corrosion Resistance

In general welding and heat treatment, there will not be carbide precipitation because of the carbon content is very low (0.020% maximum). This eliminates the intergranular corrosion after the welding and heat treatment. Due to high nickel chromium molybdenum content, and copper element, so even if the 904L in reducing environments, such as in sulfuric acid and formic acid can be deactivationcan be deactivation. High nickel content also has a lower corrosion rate in the activity state. In the range of 0 ~ 98% concentration pure sulfuric acid , 904L of the use of temperature can be as high as 40℃. In the range of 0 ~ 85% concentration pure sulfuric acid, its corrosion resistance is very good. In the industrial phosphoric acid production of Wet method,the impurities are strongly influence of corrosion.904L corrosion resistance is better than ordinary stainless steel in all kinds of phosphoric acid.In strong oxidation of nitric acid, 904L lower corrosion resistance compared to non-molybdenum high alloy steel; In the hydrochloric acid, 904L limited to the use of lower concentrations of 1-2%. In this concentration range. 904L corrosion resistance better than generic stainless steel. 904L with a high resistance to pitting, its crevice corrosion resistance are also very good Chloride solution. 904L high nickel content, reducing the corrosion rate in gap and insurface blemish. Ordinary austenitic stainless steel in the temperature higher than 60 ℃, maybe sensitive of the stress corrosion resistance in a rich chloride environment, by increasing the nickel content in stainless steel, can reduce this sensitivity. Due to the high content of nickel, 904L with high stress corrosion cracking capacity in chloride solution, the concentration hydroxid solution and rich sulfureted hydrogen environment.

Over 200 Tons in Stock for 904L Stainless Steel Products!

As one of the biggest 904L stainless steel stockholder and supplier in India, Metallica carries inventory of over 200 tons in its warehouses in Mumbai, Maharashtra India. We sell our 904L steel products throughout India, and to international clients.

904L, Grade 904L, Alloy 904L, AISI 904L, TYPE 904L, ASTM A240, ASME SA240, 904L Stainless Steel, N08904, 1.4539, X1-Ni-Cr-Mo-Cu-25-20-5, SS 2562, ASTM B625, ASTM B649, ASTM B673, ASTM B674, ASTM B677, DIN 1.4539, ASTM A213, ASTM A269, ASTM A312, BS EN 10216 pt.5

How are Steel Pipes Certified?

Certification of Steel Pipes

Manufacturers issue a Material Test Report or Mill Test Report to validate that the product meets the chemical analysis and mechanical properties specification. The MTR will contain all relevant data to the product and will accompany the product through its lifecycle.

The following are typical parameters that may be recorded on an MTR:

  • Chemical composition including carbon content, alloys, and sulfur
  • Material size, weight, identification, and grade
  • Material heat number, which ties back to the processing batch
  • Mechanical properties like tensile strength, yield strength, and elongation

At Metallica, we will Provide you with Original MTR’s for all 904L Stainless Steel Pipe and its Related Products! We will Send Our Test Certificates, along with Quotation