Product origin:

Nippon Steel / Nippon metallurgy / ottokunp, Sweden

Executive standard:

ASTM a240/asme sa-240, ASTM a276, ASTM a182/asme sa-182, ASTM a312/asme A312, ASTM b625/asme b625, ASTM b673/asme b673 international terms: 904L, al-904l, UNS N08904, sus890l, f904l, w.-nr 1.4539、NAS 255、00Cr20Ni25Mo4.5Cu

Main ingredients:

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:

904L density: 8.06g/cm3, melting point: 1300-1390 ℃, magnetism: None

Mechanical properties:

Tensile strength: σ B ≥ 490mpa, yield strength σ B ≥ 215mpa: elongation: δ ≥ 35%, hardness: 70-90 (HRB)

Corrosion resistance:

904L is an austenitic stainless steel with low carbon content and high alloying designed for harsh corrosive environments. It has better corrosion resistance than 316L and 317L. At the same time, it takes into account both price and performance, and has a high cost performance ratio. Due to the addition of 1.5% copper, it has excellent corrosion resistance for reducing acids such as sulfuric acid and phosphoric acid. It also has excellent corrosion resistance and intergranular corrosion resistance to stress corrosion, pitting corrosion and crevice corrosion caused by chloride ions. In the concentration range of 0-98% pure sulfuric acid, the use temperature of 904L can be as high as 40 ℃. The corrosion resistance of pure phosphoric acid in the concentration range of 0-85% is very good. In the industrial phosphoric acid produced by wet process, impurities have a strong influence on the corrosion resistance. Among all kinds of phosphoric acid, 904L has better corrosion resistance than ordinary stainless steel. In strong oxidizing nitric acid, 904L has lower corrosion resistance than high alloying steel without molybdenum. In hydrochloric acid, the use of 904L is limited to a lower concentration of 1-2%. In this concentration range. The corrosion resistance of 904L is better than that of conventional stainless steel. 904L steel has high pitting corrosion resistance. It can resist crevice corrosion in chloride solution. The force is also very good. The high nickel content of 904L reduces the corrosion rate in pits and cracks. When the temperature of ordinary austenitic stainless steel is higher than 60 ℃, it may be sensitive to stress corrosion in a chloride rich environment. This sensitivity can be reduced by increasing the nickel content of stainless steel. Due to the high nickel content, 904L has high stress corrosion cracking resistance in chloride solution, concentrated hydroxide solution and hydrogen sulfide rich environment.

Application fields:

Petroleum and petrochemical equipment, such as reactors in petrochemical equipment, sulfuric acid storage and transportation equipment, such as heat exchangers, flue gas desulfurization devices in power plants, mainly used in: tower body, flue, gate plate, internals, sprinkler system, etc. of absorption tower, scrubber and fan in organic acid treatment system, sea water treatment device, sea water heat exchanger, paper industry equipment, sulfuric acid, nitric acid equipment, acid making Pharmaceutical industry and other chemical equipment, pressure vessels, food equipment, pharmaceutical factories: centrifuges, reactors, etc., plant food: soy sauce tanks, cooking wine, salt tanks, equipment and dressings, and 904L is the matching steel for dilute sulfuric acid strong corrosive medium.

Supporting welding materials:

The welding of 904L adopts er385 welding wire and E385 welding rod, and the welding material size is Φ 1.6、2.4、2.5、3.2、4.0

Supply style:

Plates, strips, bars, wires, forgings, light rods, welding materials, flanges, etc. can be processed according to the drawing. Welcome to inquire