CR1200/1500MS martensitic steel is a high-strength, high-toughness martensitic steel, which is obtained by controlling the chemical composition and heat treatment process in the cold rolling process. Among them, “CR” indicates that the martensitic steel is processed by cold rolling, while “1200/1500” means that its tensile strength is 1200MPa and 1500MPa respectively. This kind of steel has excellent ductility and toughness in addition to high strength, so it is widely used in the manufacture of parts in the fields of automobiles, aerospace, and energy. In addition, due to its excellent corrosion resistance, it can also be used in special environments such as offshore platforms and oil field development.

What is the chemical composition of CR1200/1500MS martensitic steel?

Carbon content: usually between 0.2% and 0.3%

Chromium content: usually between 10% and 15%

Nickel content: usually between 3% and 8%

What are the mechanical properties of CR1200/1500MS martensitic steel?

Tensile strength: The tensile strength of CR1200/1500MS martensitic steel is about 1200MPa and 1500MPa respectively.

Yield strength: The yield strength of CR1200/1500MS martensitic steel is generally higher than about 80% of the tensile strength.

Elongation: The elongation of CR1200/1500MS martensitic steel is usually between 6% and 12%, which indicates that they have good plasticity and toughness.

Impact toughness: The impact toughness of this steel is excellent, and it can maintain high toughness even at low temperatures.

What are the characteristics of CR1200/1500MS martensitic steel?

High strength: The tensile strength of CR1200/1500MS martensitic steel is about 1200MPa and 1500MPa respectively, which is much higher than that of ordinary steel.

High toughness: The elongation of CR1200/1500MS martensitic steel is generally between 6% and 12%. It has good plasticity and toughness, and can withstand large deformation.

Good impact toughness: The steel has excellent impact toughness and can maintain high toughness even at low temperatures.

Excellent corrosion resistance: due to its chemical composition containing chromium, nickel and other elements, CR1200/1500MS martensitic steel has good corrosion resistance and can be used in special environments such as offshore platforms and oil field development.

Weldability: CR1200/1500MS martensitic steel is easy to weld.

Light weight: Compared with traditional high-strength steel, CR1200/1500MS martensitic steel has higher strength and lighter weight, so it can reduce the weight of structural parts and help improve the fuel consumption of vehicles, aircraft and other equipment efficiency.

What is the manufacturing process of CR1200/1500MS martensitic steel?

The manufacturing process of CR1200/1500MS martensitic steel usually includes the following steps:

Selection of raw materials: select high-quality raw materials, control ingredients and impurity content.

Precise Dosing: Chemical elements are added to the furnace in exact proportions for mixing.

Melting: use equipment such as electric arc furnace or induction furnace for melting, and use vacuum, argon and other atmosphere protection technologies to control the formation of oxidation and inclusions.

Molten steel treatment: Degassing, desulfurization, dephosphorization and other treatments are performed on molten steel.

Transition Element Control: Adjust organization and performance by adding appropriate transition elements.

Cooling: The steel is rapidly cooled from high temperature to below room temperature by means of rapid cooling to achieve the deformation and treatment of the martensitic structure and further improve the strength and toughness of the steel.

Reprocessing: through subsequent processing such as cold rolling, quenching and tempering, the performance of the steel is further improved and its structure is adjusted.

Through these precise production processes, CR1200/1500MS martensitic steel, a special steel with high strength and high toughness, is produced.

What is the heat treatment process of CR1200/1500MS martensitic steel?

Heating: Heat the steel to 800°C~900°C to make it completely enter the austenite region. This temperature range is the optimum temperature required to deform the martensite.

Rapid Cooling: Steel cools rapidly after being heated to a specified temperature. Rapid cooling can be carried out with water, oil, air and other media. Among them, the cooling speed of water is the fastest, and the highest strength and hardness can be obtained.

Quenching: After rapid cooling, the martensitic deformed state is maintained by a quenching operation. During quenching, the surface temperature of the steel material drops slower than that of the interior, so the temperature of the quenching medium is required to be lower than the initial temperature of martensite to ensure the uniformity of the martensite structure from the surface to the inside.

Tempering: In order to improve the toughness and reduce brittleness of steel, it is necessary to temper the steel. Tempering is generally carried out in the temperature range of 300 ° C to 600 ° C. The higher the tempering temperature, the better the toughness of the steel, but the lower the strength. The tempering time will also affect the performance of the steel, generally about 1 hour.

What are the uses of CR1200/1500MS martensitic steel?

CR1200/1500MS martensitic steel has high strength, high toughness and excellent corrosion resistance, so it is widely used in the following fields:

Automobile manufacturing: CR1200/1500MS martensitic steel is often used in the manufacture of automobile engine block, suspension system, chassis and other parts. Compared with traditional high-strength steel, it can reduce the weight of automotive structural parts and improve fuel efficiency.

Aerospace: Due to its light weight, high strength and good corrosion resistance, CR1200/1500MS martensitic steel is widely used in the manufacture of aircraft structural parts and engine parts. For example, the manufacture of key components such as landing gear.

Energy field: CR1200/1500MS martensitic steel is widely used in the manufacture of nuclear power plant pressure vessels, pipelines, valves, pumps and other key equipment.

Offshore engineering: CR1200/1500MS martensitic steel has excellent corrosion resistance, so it can be used in special environments such as offshore platforms and oil field development.

Electrical and electronic: CR1200/1500MS martensitic steel can also be used in the electrical and electronic field, such as manufacturing components of comprehensive cables, transformers and other equipment.

In addition, CR1200/1500MS martensitic steel can also be used in industrial fields such as manufacturing tools, molds and bearings.

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