UNS NO8904, commonly known as stainless steel 904L, is a low carbon high alloy austenitic stainless steel which is widely used in applications where the corrosion properties of AISI stainless steel 316L and AISI stainless steel 317L are not adequate. The addition of copper to this grade gives it corrosion resistant properties superior to the conventional chrome nickel stainless steels, in particular to sulphuric, phosphoric and acetic acids. However, there is limited use with hydrochloric acids. It also has a high resistance to pitting in chloride solutions, a high resistance to both crevice and stress corrosion cracking. Stainless Steel 904L performs better than other austenitic stainless steels due to the higher alloying of nickel and molybdenum. The grade is non-magnetic in all conditions and has excellent formability and weldability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures. The high chromium content promotes and maintains a passive film which protects the material in many corrosive environments.Stainless Steel 904L has a greater resistance to precipitation of ferrite and sigma phases on cooling and welding than other stainless steels containing molybdenum such as stainless steel 316L and stainless steel 317L. There is no risk of intercrystalline corrosion on cooling or welding due to the low carbon content. Its maximum service temperature is at 450°C. This grade is particularly useful in control and instrumentation tubing applications where stainless steel 316 and stainless steel 317Lare not suitable.
Available stainless steel tubes product forms
Straight
Coiled
Seamless
Typical Applications
Seawater cooling equipment
Chemical processing for sulphuric, phosphoric and acetic acids
Gas washing
Condenser stainless steel tubes
Control and instrumentation
Heat exchangers
Aircraft piston engine manifolds
Stainless Steel Pipe Fittings
Ball Valves
Thermal oxidizers
Refinery equipment
Stainless Steel flanges
Expansion joints
High temperature chemical process equipment
Typical manufacturing specifications
ASTM A213
ASTM A269
ASTM A312
BS EN 10216 pt.5
Also inpidual customer specifications.
Industries predominantly using this grade
Chemical processing
Oil and gas
Pharmaceutical
TECHNICAL DATA
Mechanical PropertiesTemperAnnealedTensile Rm71ksi (min)Tensile Rm490MPa (min)R.p. 0.2% Yield32ksi (min)R.p. 0.2% Yield220MPa (min)Elongation (2” or 4D gl)35% (min)
Physical Properties (Room Temperature)Specific Heat (0-100°C)450J.kg-1.°K-1Thermal Conductivity11.5W.m -1.°K-1Thermal Expansion15.8mm/m/°CModulus Elasticity190GPaElectrical Resistivity9.52μohm/cmDensity7.95g/cm3
Chemical Composition (% by weight)ElementMinMaxC–0.2Mn–2Ni2328Cr1923S–0.3Mo45N–0.1Cu12P–0.03Si–0.7
wilsonpipeline Pipe Industry Co., Limited offers 904L Stainless Steel Pipes, 904L Stainless Steel Tubes, 904L Stainless Steel Flanges, 904L Stainless Steel Pipe Fittings, etc.
Source: wilsonpipeline Pipe Industry (www.wilsonpipeline.com)
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