CN7M Stainless Steel Properties, Composition & Equivalent
CN7M ASTM A743 / A351 / A744 Grade(UNS): N08007 Alloy Family: Super Austenitic Stainless Steel Equivalent: Alloy 20 steel
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What is CN7M Stainless Steel ?
CN7M is a kind of austenitic stainless steel with high silicon and nickel content and easy heat conduction.
It has corrosion resistance and can resist the corrosion of bad environment, spot, and crack. It is also stabilized by columbium, which significantly reduces carbide precipitation during welding.
It has a variety of characteristics of stainless steel and nickel and has the largest acid corrosion resistance.
It has good mechanical properties at normal temperatures and high temperatures. It is often used in industrial process manufacturing.
It has excellent resistance to stress corrosion cracking in boiling 20% – 40% sulfuric acid.
It is also used in food, dyes, valves, hangers, rubber synthesis, plastic manufacturing, and other fields.
CN7M chemical composition
| C | Mn | Si | P | S | Cr | Ni | Mo | Copper | |
| Max | 0.07 | 1.50 | 1.5 | 0.04 | 0.01 | 22.0 | 30.5 | 3.0 | 4.0 |
| Min | – | – | – | – | – | 19.0 | 27.5 | 2.0 | 3.0 |
Heat treatment
Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means
Mechanical Properties
| Grade | CN7M |
| Yield Strength, min | Ksi – 25, MPa – 170 |
| Tensile Strength, min | Ksi – 62, MPa – 425 |
| Elongation[50mm], min / % | 35 % |
Features
- Easy to conduct heat
- It has corrosion resistance
- It can resist harsh environment
- Good mechanical properties
- Excellent stress resistance
Applications
- Oil and Gas Industry
- Platforms, heat exchangers, underwater and fire protection equipment
- Chemical Processing, Vessels and Piping
- Mechanical Components (Corrosion Resistant Components)
CN7M equivalent
Alloy 20 Steel
Alloy 20 is a kind of austenite alloy based on iron, which is developed to resist sulfuric acid corrosion. It has excellent sulfuric acid corrosion resistance. It has strong resistance to phosphoric acid, nitric acid and chloride environment, chloride stress corrosion, point corrosion, and crack corrosion resistance. Therefore, alloy 20 has the name of corrosion-resistant alloy. Alloy 20 is widely used in many fields, such as chemistry, food, medicine, electric power production, and the plastic industry. Alloy 20 is resistant to pitting corrosion, chloride corrosion, stress corrosion cracking, and so on