CF3MN Stainless Steel Properties, Composition & Equivalent
CF3MN ASTM A743 / A351 Grade(UNS): J92804 Alloy Family: Austenitic Stainless Steel Equivalent: 304LN stainless steel
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What is CF3MN Stainless Steel ?
CF3MN alloy is an ultra-low carbon austenitic alloy with low carbon content on the basis of stainless steel, which adds N to the CF3M steel and possesses the characteristics of CF3N. CF3MN has good corrosion resistance to various organic acids, inorganic acids, bases and salts.Good resistance to sensitized intergranular corrosion.Not suitable for multi-layer post-weld heat treatment.
CF3MN is mainly used in oil, chemical industry, medical treatment, food, light industry, mechanical instrument and other industrial conveying pipelines as well as mechanical structural parts.In addition, it is widely used in manufacturing mechanical parts and engineering structures because of its light weight when bending and torsional strength are the same.It is also commonly used in the production of various conventional weapons, barrels, shells, etc.
CF3MN Chemical Composition
| C | Mn | Si | P | S | Cr | Ni | Mo | Nitrogen | |
| Max | 0.03 | 1.50 | 1.50 | 0.04 | 0.04 | 22.0 | 13.0 | 3.0 | 0.20 |
| Min | – | – | – | – | – | 17.0 | 9.0 | 2.0 | 0.10 |
Heat treatment
(1) Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, and cool rapidly.
(2) As cast if corrosion resistance is acceptable
Mechanical Properties
| Grade | CF3MN |
| Reduction of Area, min / % | – |
| Yield Strength, min | Ksi – 37, MPa – 255 |
| Tensile Strength, min | Ksi – 75, MPa – 515 |
| Elongation[50mm], min / % | 35 % |
Features
- Very high conductivity
- High internal energy
- Low toughness
- The hardening effect is obvious
- Good wear resistance
Applications
- Petroleum
- Chemical industry
- Medical care
- Food processing
- Light industry
- Barrel
- Marine equipment
CF3MN Equivalent
316LN stainless steel
316LN stainless steel is used in pulp and paper equipment, heat exchanger, dyeing equipment, film processing equipment, pipelines, materials for building exterior in coastal areas, as well as watch chains and case of high-grade watches.
It is a kind of molybdenum-bearing stainless steel. Due to the molybdenum content in the steel, the performance of this steel is better than that of 316 and 316L stainless steel. Under high-temperature conditions, when the concentration of sulfuric acid is lower than 15% or higher than 85%, CF3MN stainless steel has a wide range of applications. It also has good chlorine resistance, so it is usually used in a marine environment.
Because of its excellent corrosion resistance, 316LN is used in the chemical industry. It is also a derivative steel of 18-8 austenitic stainless steel with 2-3% Mo added. On the basis of this, many steel grades have been derived