体彩20选5复式计算表:904L

904L (UNS N08904) is an austenitic stainless steel alloy designed for a middle to high level of corrosion resistance. The alloy contains high levels of chromium and nickel with additions of molybdenum and copper to provide added corrosion resistance in certain media. The alloy is produced to low carbon levels for use in the welded condition as in welded vessels and other large and complex fabrications.The high nickel (25%) and molybdenum (4% – 5%) contents of the 904L? alloy provide good resistance to chloride stress corrosion cracking. Chromium, molybdenum and nickel levels provide a level of general and chloride pitting corrosion resistance above the level of Types 316 and 317 in many media. The copper addition at this alloy content provides added resistance to reducing media such as hot phosphoric acid and dilute sulfuric acid. The N08904 alloy has been incorporated in ASTM and ASME specifications, and is widely and readily available in a variety of product forms, weldingelectrodes, and fittings. The Alloy 904L alloy has performed well in a variety of service environments such as utility scrubbers, acid and fertilizer production.

 

Specifications

UNS N08904

Werkstoff – Nr. 1.4539

Uranus B6

Seamless Tubes (A-269, B-677); Welded Tubes (A-269, B-674); Plates (B-625); Bars (B-625)

 

Chemical composition

Grade C% Mn% P% S% Si% Ni% Cr% Mo% Cu% Fe%
904L Max 0.02 Max 2.0 Max 0.045 Max 0.035 Max 1.0 23.0-28.0 19.0-23.0 4.0-5.0 1.0-2.0 Balance

 

Mechanical properties

Form Condition Yield strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Elongation
A %
Sheet, Plate, Strip, Bar Annealed 215 490 35

 

Characteristics

● High strength and hardness

● Excellent corrosion resistance

● Good resistance to impingement attack

● High fatigue strength in seawater

● Low magnetic permeability

 

Applications

● Processing plant for sulphuric, phosphoric and acetic acids

● Pulp and paper processing

● Components in gas scrubbing plants

● Seawater cooling equipment

● Oil refinery components

● Wires in electrostatic precipitators