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ASTM 904L Stainless Seamless Steel Pipes
ASTM 904L Stainless Steel Pipe, abbreviation SS 904L pipe，Stainless steel 904L pipe (00Cr20Ni25Mo4.5Cu) N08904 is a highly alloyed austenitic stainless steel pipe with very low carbon content. The steel is designed for corrosive conditions in harsh environments The steel was initially developed for corrosion resistance in dilute sulfuric acid, a characteristic that has been proven successful in practical applications over the years. Nowadays 904L has been standardised in many and has been validated for use in the manufacture of pressure vessels.904l stainless steel is a kind of austenite stainless steel material - ferritic duplex stainless steel is austenitic and ferritic organization each about half of the stainless steel. In the case of low C content, Cr content in 18% ~ 28%, Ni content in 3% ~ 10%. Some steels also contain Mo, Cu, Si, Nb, Ti, N and other alloying elements. This type of stainless steel both austenitic and ferritic stainless steel features, compared with ferritic, plasticity, toughness is higher, no room temperature brittleness, intergranular corrosion resistance and welding performance are significantly improved, while also maintaining a ferritic stainless steel 475 ℃ brittleness as well as high thermal conductivity, superplasticity and other characteristics. Compared with austenitic stainless steel, high strength and resistance to intergranular corrosion and chloride stress corrosion has improved significantly. Duplex Stainless Steel Pipe has excellent resistance to pore corrosion, is also a nickel-saving stainless steel
904L Corresponding Grade:
1, GB-T standard: digital grade: S31782, new grade: 015Cr21Ni26Mo5Cu2, the old grade / 00Cr20Ni25Mo4.5
Cu,2, the A
merican standard: ASTMA standard: N08904, SAE standard: S3904
2, UNS standard: 904L,
3, Japanese standard JIS standard:/904L,4, German standard DIN standard:1.45395, European standard EN standard: x1nicrmocu25-20-5, French standard NF standard, British standard BS standard: 904S13,904S14, Sweden:/NTR standard: AN4.
904L application field：
904l stainless steel pipe has good activation-passivation transformation ability, excellent corrosion resistance, good corrosion resistance in non-oxidizing acids such as H2SO4, CH3COOH, HCOOH, H3PO4, good pitting resistance in neutral chloride-containing medium, and good crevice corrosion resistance and stress corrosion resistance. It is suitable for various concentrations of H2SO4 below 70℃, and has good corrosion resistance in CH3COOH and mixed acid of HCOOH and CH3COOH of any concentration and any temperature under normal pressure. It is used in the chemical industry to handle many chemicals. Some examples are: acetic acid, acetylene, acrylates, acrylonitrile, aluminum sulfate, ammonium phosphate, ammonium sulfate, battery acid, benzene, butyl acetate, caprolactone, cellophane, citric acid, nitric acid phosphate, oxalic acid, calcium superphosphate, tartaric acid, uranium oxide and zinc sulfate.
904L chemical composition:
Carbon C: ≤0.02
Manganese Mn: ≤2.00
Silicon Si: ≤1.00
Chromium Cr: 19.0~13.0
Nickel Ni: 23.0~28.0
Phosphorus P: ≤0.045
Sulfur S: ≤0.035
Molybdenum Mo:4.0~5.0
Copper Cu:1.0~2.0
904L uses, application scope, application areas are：
* Petroleum, petrochemical equipment, such as reactors in petrochemical equipment, etc.
* Sulfuric acid storage and transportation equipment, such as heat exchangers.
* Flue gas desulphurization devices in power plants, the main parts used are: tower of absorption tower, flue, stall door plate, inner parts, spray system, etc.
* Scrubbers and fans in organic acid treatment system.
* Seawater treatment device, seawater heat exchanger, paper industry equipment, sulfuric acid, nitric acid equipment, acid production, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.
*Pharmaceutical plants:centrifuges, reactors, etc.
* Plant food: soy sauce tanks, wine, salt tanks, equipment and dressings.
*Strong corrosive medium for dilute sulfuric acid 904L is the matching steel.
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Main Product:
Stainless Steel Material,
Steel Tube,
Steel Flange ,
Special Steel,
Copper Material,
Alloy Steel
