CR260B bake-hardening steel is a high-strength low-alloy steel, which is a kind of hot-rolled plate. The “CR” in its name means that the steel is manufactured by cold rolling, “260” means that its tensile strength has a minimum value of 260 MPa, and “B” means that the steel has better weldability.
What is the chemical composition of CR260B bake hardening steel?
Carbon (C) content: 0.20%
Silicon (Si) content: 0.50%
Manganese (Mn) content: 1.50%
Phosphorus (P) content: 0.025%
Sulfur (S) content: 0.020%
Chromium (Cr) content: 0.30%
Molybdenum (Mo) content: 0.10%
Nickel (Ni) content: 0.30%
Copper (Cu) content: 0.20%
What are the mechanical properties of CR260B bake hardening steel?
Tensile strength (σb): ≥ 260 MPa
Yield strength (σs): ≥ 180 MPa
Elongation (δ): ≥ 32%
Impact toughness (AKv): ≥ 34 J (-20°C)
Hardness (HB): 180-240
What are the characteristics of CR260B bake hardening steel?
High hardness: CR260B bake-hardening steel has high hardness after heat treatment, usually between HRC58-62, and can be used to manufacture parts and tools with high strength and high hardness requirements.
High strength: CR260B bake-hardening steel has high strength and is often used in the manufacture of gears, bearings, pins and other parts in mechanical transmission systems, as well as the manufacture of stamping dies and extrusion dies.
Good wear resistance: CR260B bake-hardening steel has good wear resistance and can be used to manufacture high-demand industrial parts such as wear-resistant parts and corrosion-resistant parts.
Good dimensional stability: After heat treatment, CR260B bake-hardened steel has good dimensional stability, can maintain high precision and stability, and is suitable for precision machinery and precision machining fields.
Poor processing performance: Due to the high hardness of CR260B bake-hardening steel, processing is difficult, and appropriate methods and processes are required to ensure processing quality and efficiency.
What is the heat treatment process of CR260B bake hardening steel?
The heat treatment process of CR260B bake hardening steel includes two steps of quenching and tempering.
Firstly, the quenching treatment is carried out, and the steel heated to 800-850°C is quickly put into water or oil to cool, so that it is rapidly cooled to below room temperature. Quenching can make the structure of steel undergo phase transformation, forming a martensitic structure with high hardness and high strength.
Next, tempering is carried out, and the quenched steel is heated to a temperature range of 150-250°C for tempering. Tempering can eliminate the internal stress in the steel, improve the plasticity and toughness of the steel, and can also transform martensite to ferrite, making the steel have better weldability. The selection of tempering time and temperature can be adjusted as needed to achieve different performance requirements.
What is the corrosion resistance of CR260B bake hardening steel?
The corrosion resistance of CR260B bake hardening steel is average. Due to the high content of carbon and silicon in its chemical composition, its corrosion resistance is relatively low. In addition, during heat treatment, scale and residual stress are easily formed on the surface of the steel, which further reduces the corrosion resistance of the steel.
In order to improve the corrosion resistance of CR260B bake hardening steel, it can be realized by coating or treating the surface. For example, a protective layer can be formed on the steel surface by electroplating, spraying or galvanizing to reduce corrosion and oxidation on the steel surface. In addition, surface treatment such as polishing, sandblasting and other methods can be used to remove scale and residual stress, thereby improving the surface quality and corrosion resistance of steel.
What is the scope of application of CR260B bake hardening steel?
CR260B bake-hardening steel has high hardness and strength, and is often used to manufacture parts and tools that require high strength and high hardness, such as:
Manufacture of stamping dies and extrusion dies;
Manufacturing of cutting tools, such as drill bits, milling cutters, planers, etc.;
Gears, bearings, pins and other components in mechanical transmission systems;
Mechanical components in automotive, aerospace, marine and other fields.
In addition, CR260B bake-hardening steel can also be used to manufacture wear-resistant parts and corrosion-resistant parts and other industrial parts with high requirements, such as anti-corrosion and anti-wear equipment in iron and steel smelting, chemical and other industries. It should be noted that in specific applications, it is necessary to comprehensively consider the performance characteristics, mechanical properties, corrosion resistance and other factors of CR260B bake hardening steel, and carry out corresponding design and processing to meet the actual needs of different fields.
What is the machinability of CR260B bake hardening steel?
CR260B bake-hardening steel has high hardness and strength, so proper methods and techniques need to be adopted during processing to ensure processing quality and efficiency.
Difficulty in processing: Due to the high hardness of CR260B bake-hardening steel, higher cutting speed, greater cutting force and more wear-resistant tools are required for cutting, making the processing more difficult.
Easy to generate residual stress: Bake hardened steel is prone to residual stress after processing, which will affect its mechanical properties and service life.
Preheating treatment before processing: In order to reduce the difficulty of processing and reduce the generation of residual stress, it is necessary to perform proper preheating treatment on CR260B bake hardening steel before processing.
Appropriate cutting fluid and process: During processing, appropriate cutting fluid and process should be selected to improve cutting quality and efficiency and reduce tool wear.
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