904L|N08904

Product Origin:
Japan Nippon Steel / Nippon Metal / Sweden Outokumpu

Standards:
ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312, ASTM B625/ASME B625, ASTM B673/ASME B673

Main Components:
Carbon (C) ≤ 0.02, Manganese (Mn) ≤ 2.00, Nickel (Ni) 23.0～28.0, Silicon (Si) ≤ 1.0, Phosphorus (P) ≤ 0.045, Sulfur (S) ≤ 0.035, Chromium (Cr) 19.0～23.0, Copper (Cu) 1.0～2.0, Molybdenum (Mo) 4.0～5.0

Physical Properties:
Density: 8.06g/cm³, Melting Point: 1300-1390°C, Magnetic: None

Mechanical Properties:
Tensile Strength: σb ≥ 490Mpa, Yield Strength σb ≥ 215Mpa, Elongation: δ ≥ 35%, Hardness: 70-90 (HRB)

Corrosion Resistance:
904L is a low-carbon, highly alloyed austenitic stainless steel designed for corrosive environments. It exhibits better corrosion resistance than 316L and 317L, with a good balance of price and performance, making it cost-effective. With the addition of 1.5% copper, it offers excellent corrosion resistance to reducing acids such as sulfuric acid and phosphoric acid. It also demonstrates excellent resistance to stress corrosion cracking, pitting, and crevice corrosion caused by chloride ions, as well as good resistance to intergranular corrosion. In pure sulfuric acid within the concentration range of 0-98%, 904L can be used up to 40°C. Its corrosion resistance is also excellent in pure phosphoric acid within the concentration range of 0-85%. However, impurities in industrially produced phosphoric acid can significantly affect its corrosion resistance. Compared to conventional stainless steels, 904L exhibits superior corrosion resistance in all types of phosphoric acid. In strong oxidizing nitric acid, its corrosion resistance is lower compared to molybdenum-free highly alloyed steels. Its use in hydrochloric acid is limited to lower concentrations of 1-2%. In this concentration range, 904L performs better than conventional stainless steels. 904L steel has high resistance to pitting corrosion and excellent resistance to crevice corrosion in chloride solutions. Its high nickel content reduces corrosion rates in crevices and pit areas. Ordinary austenitic stainless steels may be susceptible to stress corrosion at temperatures above 60°C in chloride-rich environments; however, increasing the nickel content of stainless steel can reduce this sensitization. Due to its high nickel content, 904L exhibits high resistance to stress corrosion cracking in chloride solutions, concentrated caustic soda solutions, and hydrogen sulfide-rich environments.

Applications:
Petroleum and petrochemical equipment such as reactors in petrochemical equipment, storage and transportation equipment for sulfuric acid such as heat exchangers, flue gas desulfurization equipment in power plants, with main applications including the tower bodies, flue gas ducts, baffle plates, internals, spray systems of absorption towers, washers and fans in organic acid treatment systems, seawater treatment devices, seawater heat exchangers, equipment in the paper industry, sulfuric acid and nitric acid equipment, acid and pharmaceutical industries, and other chemical equipment, pressure vessels, food equipment, pharmaceutical plants including centrifuges, reactors, etc. In plant foods: soy sauce tanks, rice wine, salt tanks, equipment and dressings. For environments with strong corrosion from dilute sulfuric acid, 904L is a suitable material.

Matching Welding Materials:
ER385 welding wire and E385 welding rods are selected for welding 904L. Welding material sizes available include Φ1.6, 2.4, 2.5, 3.2, 4.0.

Supply Styles:
Plate, strip, bar, wire, forgings, bright bars, welding materials, flanges, etc. Custom processing according to drawings is available. Please feel free to contact us for inquiries.