International Common Name: SUS890L, F904L, W.-Nr. 1.4539, NAS 255, 00Cr20Ni25Mo4.5Cu Executive Standard: 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 Composition: Carbon (C) ≤ 0.02, Manganese (Mn) ≤ 2.00, Nickel (Ni) 23.0-28.0, Silicon (Si) ≤ 1.0 Phosphorous (P) ≤ 0.0. 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: 904L Density: 8.24g/cm3, Melting Point: 1300-1390 ℃, Magnetic: None
Heat Treatment: 1100-1150 ℃ between Insulation 1-2 hours, rapid air-cooled or water-cooled.
Mechanical properties: tensile strength: σb ≥ 490Mpa, yield strength σb ≥ 215Mpa: elongation: δ ≥ 35%, hardness: 70-90 (HRB)
Corrosion resistance and the main use of the environment: 904L is designed for the corrosive conditions of the environment of the harsh conditions of a very low carbon content, high alloying of austenitic stainless steel, better than 316L and 317L has better corrosion resistance. 317L has better corrosion resistance, while taking into account the price and performance, cost-effective. With the addition of 1.5% copper, it has excellent corrosion resistance to reducing acids such as sulfuric and phosphoric acids. It also has excellent corrosion resistance to stress corrosion, pitting and crevice corrosion caused by chloride ions, and good resistance to intergranular corrosion. In 0-98% concentration range of pure sulfuric acid, 904L can be used up to 40 degrees Celsius. In 0-85% concentration range of pure phosphoric acid, its corrosion resistance is very good. In industrial phosphoric acid produced by wet process, impurities have a strong influence on corrosion resistance. In all kinds of phosphoric acid, 904L corrosion resistance is superior to ordinary stainless steel. In strongly oxidizing nitric acid, 904L has lower corrosion resistance compared to highly alloyed steels without molybdenum. In hydrochloric acid, the use of 904L is limited to lower concentrations of 1-2%. In this concentration range, the corrosion resistance of 904L is better than that of conventional stainless steels. 904L steel has a high resistance to pitting corrosion. Its resistance to crevice corrosion in chloride solutions. The high nickel content of 904L reduces the rate of corrosion at pockmarks and crevices. Ordinary austenitic stainless steels can be sensitive to stress corrosion in a chloride-rich environment at temperatures above 60 degrees C. This sensitization can be reduced by increasing the nickel content of the stainless steel. Due to the high nickel content, 904L has high resistance to stress corrosion rupture in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide rich environments.
Supporting welding materials and welding process: 904L welding selection of ER385 wire and E385 electrode, welding consumables size Φ1.6, 2.4, 2.5, 3.2, 4.0, origin: Austria G&G, Sweden AVESTA and Italy TFA, welding process and guide book welcome to call for.
Inventory: 904L stainless steel plate stock size 0.6mm-45mm, 904L stainless steel bar stock size Φ12mm-Φ250mm, 904L stainless steel pipe fittings and other customized according to customer requirements. The origin of the material is mainly Japan Metallurgy and Sweden OUTOKUMPU. provide the original material certificate, customs declaration and origin documents.
Application areas are: petroleum, petrochemical equipment, such as petrochemical equipment in the reactor, etc., sulfuric acid storage and transportation equipment, such as heat exchangers, etc., power plant flue gas desulphurization devices, the main use of parts are: the tower of the absorption tower, flue, stall door plate, internal parts, spray system, etc., the scrubber and fan in the organic acid treatment system, seawater treatment devices, seawater heat exchangers, paper industry equipment. Sulfuric acid, nitric acid equipment, acid production, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment, pharmaceutical factories: centrifuges, reactors, etc., plant food: soy sauce tanks, wine, salt tanks, equipment and dressings, strong corrosive medium of dilute sulfuric acid 904L is a matching steel.