CD 4MCu round bar CD4MCu standard 0Cr26Ni5Mo2Cu3 .

Mondo Culture Updated on 2024-01-29

CD-4MCU duplex stainless steel is a material with excellent properties, and its full name is 0Cr26Ni5Mo2Cu3. The alloy is nominally a 26Cr-6Ni alloy with the addition of molybdenum and copper. It is important to note that there is no corresponding deformed steel grade for this alloy.

The microstructure of CD-4MCU in the as-cast state is biphasic and consists of austenite distribution in a ferrite matrix. This structure allows the material to have good corrosion resistance while maintaining high strength. In the as-cast state, the carbide precipitation of the alloy is limited by the carbon content of the alloy and therefore does not need to be eliminated by solution treatment. However, solution treatment still plays an important role in improving the corrosion resistance and mechanical properties of materials.

Solution treatment temperature has an important impact on the performance of CD-4MCU. Generally speaking, the solution treatment temperature is 1120 °C and needs to be kept warm for at least two hours to ensure a uniform temperature. Then, the material needs to be slow-cooled to 1010 1065, kept warm for half an hour, and then quenched. The lower holding temperature can avoid cracking of the casting during the quenching process.

After heat treatment, the structure of the CD-4MCU remains biphasic, i.e., containing 35 to 40% austenite in a ferrite matrix. This microstructure gives the alloy good mechanical properties, its yield strength is about twice that of 19Cr-9Ni austenitic alloys, and it has high hardness, good tensile plasticity and satisfactory impact toughness.

CD-4MCU alloy has better corrosion resistance than CF alloy in many corrosive media, and is especially suitable for use under strong acid or alkali working conditions. For example, under the working conditions of oxidizing and reducing strong acids, the CD-4MCU alloy has special resistance to stress corrosion cracking. In addition, the alloy also exhibits good corrosion resistance in the presence of chlorine.

For cases where the CD-4MCU alloy needs to be further strengthened, it can be achieved through aging treatment. Ageing can cause precipitation hardening, which increases the strength and hardness of the material. The degree of aging reaction and the performance in the aging state are related to the solution treatment temperature, aging temperature and aging time. Since CD-4MCU alloys have sufficient strength and excellent corrosion resistance in many applications after solution treatment, they are not often used in the aging state.

The chemical composition of the CD-4MCU alloy also has an important impact on its properties. The chemical composition of this alloy ranges from: c 004,mn≤1.0,si≤1.0,p≤0.04,s≤0.04,cr=24.5~26.5,ni=4.75~6.00,mo=1.75~2.25,cu=2.75~3.25。In this composition range, the alloy has the best corrosion resistance and mechanical properties.

In conclusion, CD-4MCU duplex stainless steel is a material with excellent properties and is suitable for a wide range of corrosive working conditions. Its good corrosion resistance and high strength make it ideal for many fields.

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