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Stainless Steel 904L Pipes – Composition, Properties and Uses

Stainless Steel 904L Pipes

Stainless Steel 904L Pipes is an austenitic stainless steel alloy with a chromium-nickel-molybdenum base that hwithlent corrosion resistance, fabricability and weldability, making it ideal for use in corrosive conditions. SS 904L Welded Pipes high chromium content gives it superior resistance to stress corrosion cracking and crevice corrosion.

Stainless Steel 904L Pipes Composition:

SS 904L pipes, also known as UNS N08904, are made up of a high amount of chromium, nickel and iron, which offer superior corrosion resistance, strength and toughness. The alloy also has low carbon content, copper and molybdenum, contributing to its excellent resistance to pitting and crevice corrosion. Due to these characteristics, 904L Seamless Pipe are very popular in various industries, including chemical processing, pharmaceuticals, water treatment facilities, and marine environments.

C 0.2
Mn 2
Ni 23 28
Cr 19 23
S 0.3
Mo 4 5
N 0.1
Cu 1 2
P 0.03
Si 0.7

AISI 904L Welded Pipe Mechanical Properties:

UNS N08904 Pipes are well-suited for use in environments that require resistance to elevated temperatures and high levels of corrosion. The high nickel and molybdenum content give it excellent resistance to stress-corrosion cracking and intergranular corrosion. Moreover, AISI 904L Seamless Pipe have excellent formability and fabricability, which make them easy to form and weld.

Tensile Rm 71 ksi (min)
Tensile Rm 490 MPa (min)
R.p. 0.2% Yield 32 ksi (min)
R.p. 0.2% Yield 220 MPa (min)
Elongation (2” or 4D gl) 35 % (min)

ASTM A312 TP904L Pipes Physical Properties:

Specific Heat (0-100°C) 450°K-1
Thermal Conductivity 11.5 W.m -1.°K-1
Thermal Expansion 15.8 mm/m/°C
Modulus Elasticity 190 GPa
Electrical Resistivity 9.52 μohm/cm
Density 7.95 g/cm3

ASME SA 312 TP904L Pipes Equivalent:

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
904L N08904 904S13 X1NiCrMoCu25-20-5 1.4539 SUS 890L

904L Stainless Steel Pipes Uses :

904L Pipe resistance to strong reducing acids such as sulphuric acid, phosphoric acid and organic acids like acetic acid makes them suitable for various industries. The Food & Beverage, and Brewery industries use 904L pipes primarily for making dairy and brewery products. Stainless Steel 904L 1.4539 Pipes are also used in the Chemical Processing, Oil and Gas, and Marine industries – these sectors use 904L pipes for pipes, heat exchangers, tanks, and pressure vessels.

Grade 904L SS Pipes Heat Treatment :

904L EFW Pipe are usually solution heat-treated at around 1940 degrees Fahrenheit, followed by a rapid quench. Then to enhance a good combination of strength and toughness, the material is given a sub-zero cooling treatment that dramatically reduces the temperature of the steel. This process is known as cryogenic cooling. However, production techniques according to the end usage of pipes might vary; in general, 904L SS Welded pipes are heat treated to improve their properties.

DIN 1.4539 Pipes Corrosion Resistance:

An outstanding feature of UNS N08904 Pipes is their corrosion resistance. This is due to the high level of nickel and molybdenum content and the low amount of carbon, which provides excellent corrosion resistance and prevents localized corrosion. Compared to other austenitic stainless steels, ASTM A358 Stainless Steel 904L EFW Pipe offer very good resistance to stress corrosion cracking and can withstand high temperatures up to 400 °C. This makes them the preferred choice in highly corrosive environments.


SUS 904L Pipe, are highly sought after due to their strength, toughness, and excellent corrosion resistance. Their composition consisting of a high level of nickel and molybdenum and low carbon content makes them resistant to various forms of corrosion. They are versatile, vital in various industrial processes, and highly valued in the marine, chemical, and oil and gas industries. The heat treatment process can also improve their properties. Whether for the marine or chemical processing industry, if you are looking for a cost-effective and reliable material that can keep up with high-temperature and corrosive environments, Alloy 904L pipes are the way to go.

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