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Stainless steel seamless pipe 904L

Stainless steel seamless pipe 904L

Place of Origin : Zhejiang,China
Brand Name : X&FSTEEL
Model Number : 904L
Certification : China Classification Society Certification, ISO9001 Quality System Certification
Packaging Details : Wrapped with woven bag package
Delivery Time : The delivery time is according to the order
Payment Terms : 30%T/T
MOQ : 2 tons
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904L ,super austenitic stainless steel ,belongs to low carbon high nickel and molybdenum austenitic stainless acid-resistant steel, is proprietary material introduced from the h. S company of French. 904L has the very good activation - passivation shift ability, excellent corrosion resistance, in the oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid have good corrosion resistance, in the neutral medium containing chloride ions has the very good resistance to pitting corrosion, and has a good resistance crevice corrosion and stress corrosion resistance. Applicable to various concentrations of sulphuric acid under 70 ℃, under ordinary conditions of pressure resistance to any concentration, temperature of acetic acid and formic acid and acetic acid in mixed acid corrosion resistance is very good also.

Main Component


Grades In Different Standard

UNS: N08904


ASTM: A240


Metallographical Structure

904L austenitic organization is completely, and compare with generally high molybdenum austenitic stainless steel ,904 l is not sensitive to ferrite and the precipitation ofαphase.


Density8.0g/cm3Tensile Strengthσb≥520MpaElongation Rateδ≥35%

Corrosion Resistance :

Since the 904L carbon content is very low (Max:0.020%), so in the case of the general heat treatment and welding, there would be no carbide precipitation. It eliminated the the risk of intergranular corrosion after general heat treatment and welding . Because of the high content of nickel ,chrome, molybdenum , and add the copper element, so ,904L even in a reducing environment, such as sulfuric acid and formic acid , it can also be blunted.High nickel content in the active state has low corrosion rate.In the concentration range of 0 ~ 98% pure sulfuric acid, the Celsius temperature of use 904L can be as high as 40 degrees . In 0 ~ 85% concentration range of pure phosphoric acid , its corrosion resistance is very good. In the industrial phosphoric acid production of wet process, impurities has a strong influence to against corrosion . In all various kinds of phosphate, 904L stainless steel corrosion resistance is superior to the ordinary. 904L, in strong oxidizing nitrate, compared with the high alloying steel does not contain molybdenum, has low corrosion resistance. In hydrochloric acid, the use of 904L is limited to low concentration of 1-2%. In this concentration range,904L has a good corrosion resistance performance compare with the conventional stainless steel .904L stainless steel has high corrosion resistance. The crevice corrosion resistance in chloride solution is also very good. High nickel content of 904L, reduced the hemp pit corrosion speed and aperture place. Common austenitic stainless steel ,when the temperature is higher than 60 degrees , in a rich of stress corrosion in chloride environment is likely to be sensitive.By raising the nickel content of stainless steel, can reduce the sensitization. Because of the high nickel content ,904L in chloride solution, concentration of hydroxide solution and rich hydrogen sulfide environment, has the very high resistance to stress corrosion cracking .

Welding materialsWelding rodE385-16/17),Solder wireER385)。


*Petroleum, petrochemical equipment, such as petrochemical equipment in the reactor.

*Sulfuric acid storage and transportation equipment, such as heat exchangers, etc.

*With power plant flue gas desulfurization device, main parts are: absorption tower of the tower body, the flue, shift door plank, internal parts, spray system, etc.

*Organic acid scrubber and the fan in the handle system.

*Water treatment plant, water heat exchanger, papermaking equipment, sulfuric acid, nitric acid, sulphuric acid, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.

*Pharmaceutical factory, centrifuge, reactor, etc.

*Plant foods: soy sauce pot, cooking wine, salt, and dressing equipment.

*To dilute sulphuric acid is strong corrosive medium is matching with 904 l steel grade.



1.1 Welding Property

As with normal stainless steel, all kinds of welding methods may be used for 904L. The most commonly used welding methods are manual arc welding and inert gas protection welding, welding rod and wire metal based on the parent metal composition and purity is higher, the content of molybdenum demand is higher than the parent metal. Generally do not need to preheat before welding, but working in the cold outdoors, to avoid moisture agglutination, sub area or the adjacent area need uniform heating.Pay attention to the local temperature not more than 10 0 ℃, lest cause carbon concentration, lead to intergranular corrosion. Welding need use small line energy, continuous and fast welding speed. Generally do not need to heat treatment after welding, in case need to heat treatment, must rapidly cooling after heating to 110 ~ 110 ℃.

1.2 Machining Properties

Machining characteristics of 90 L austenitic stainless steel, similar to other machining process has a tendency to stick knife and work hardening. Carbide cutting tools, must adopt positive rake Angle to sulfide and chlorinated oil as cutting coolant, equipment and processes should be in order to reduce work hardening. Cutting should avoid using slow speed and feed quantity in the process of cutting .

Chemical Component:





























Mechanical Property:


8.0 g/cm3

Melting point


Mechanical Property In Normal Temperature:


Rm N/mm2


A5 %





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