What is CR300B bake hardening steel?

CR300B bake-hardening steel is a special steel whose main components are elements such as carbon, manganese, silicon, phosphorus and sulfur. Through a special heat treatment process, it is heat treated at high temperature and cooled after heat treatment, so as to obtain high hardness, high strength and excellent wear resistance. CR300B bake-hardening steel is widely used in automobiles, machinery, tools and other fields, and is mainly used to manufacture components that require high strength, high hardness and wear resistance, such as wheels, gears, bearings, friction plates, guide plates, etc.

What is the chemical composition of CR300B bake hardening steel?

Carbon (C): 0.28% – 0.33%

Manganese (Mn): 1.00% – 1.50%

Silicon (Si): 0.15% – 0.35%

Phosphorus (P): no more than 0.025%

Sulfur (S): no more than 0.015%

In addition, CR300B bake-hardening steel also contains trace amounts of other elements, such as copper (Cu) and chromium (Cr), which also have certain effects on the properties of the steel. These chemical components affect the performance indicators of steel such as hardness, strength, and toughness, and also determine the processing performance of steel during heat treatment and machining.

What are the mechanical properties of CR300B bake hardening steel?

Tensile strength: usually around 1300MPa.

Yield strength: usually around 1000MPa.

Elongation: usually above 8%.

Impact toughness: usually above 20J/cm².

Hardness: usually between HRC45-55.

Fatigue limit: usually around 1000MPa.

How hard is CR300B bake hardening steel?

The hardness of CR300B bake hardening steel can usually reach HRC 58-62 after heat treatment, which is a relatively high hardness. After proper tempering, the hardness of the steel can be adjusted to some extent, but usually not reduced too much.

It should be noted that the hardness of CR300B bake-hardening steel is affected by many factors, such as heat treatment process, chemical composition of steel, cooling medium, tempering temperature and time, etc. Therefore, in practical applications, it is necessary to select an appropriate heat treatment process according to the specific situation, and strictly control various parameters in the heat treatment process to ensure that the steel meets the expected hardness and performance requirements.

What problems should be paid attention to in the use of CR300B bake hardening steel?

CR300B bake hardening steel needs to pay attention to the following problems in use:

Temperature: When using CR300B bake-hardened steel, it is necessary to control the working temperature to avoid the softening of the steel due to excessive temperature and affect its mechanical properties.

Wear: CR300B bake-hardening steel has high hardness and wear resistance, but it still needs to be careful to avoid excessive wear during use to maintain its performance.

Corrosion: CR300B bake-hardening steel is easily corroded, so care should be taken to prevent the steel from corrosion during storage and use.

Welding: CR300B bake-hardening steel is not easy to weld, and it is necessary to select suitable welding materials and welding methods to avoid affecting its performance.

Cutting: CR300B bake-hardened steel has high hardness and is difficult to cut. It is necessary to select appropriate cutting tools and cutting conditions to avoid the impact on tool wear and machining accuracy during cutting.

How is CR300B bake hardening steel heat treated?

The heat treatment process of CR300B bake hardening steel usually includes the following steps:

Heat treatment: heat CR300B bake-hardened steel to a temperature range of 800°C-850°C, and the holding time is generally 1 hour/25mm. The purpose of this step is to transform the austenite in the steel into austenite that is stable at high temperature, and dissolve elements such as carbon and chromium in the crystal to prepare for the subsequent cooling process.

Water quenching: After heat treatment, the CR300B bake-hardening steel is rapidly cooled to room temperature, and the commonly used cooling medium is water or oil. The purpose of this step is to form a solid solution of carbon, chromium and other elements in the steel to increase the hardness and strength of the steel.

Tempering treatment: heat the cooled CR300B bake-hardened steel to an appropriate temperature (generally 300°C-500°C), and keep it warm for 1-2 hours. The selection of tempering temperature and holding time will affect the hardness and toughness of steel. Generally speaking, the higher the tempering temperature, the lower the hardness and the higher the toughness of the steel, and vice versa.

Final treatment: For some CR300B bake-hardened steels that require high dimensional accuracy and surface quality, final treatment is also required, such as grinding, polishing, sandblasting, etc.

What are the applications of CR300B bake hardening steel?

CR300B bake-hardening steel has excellent mechanical properties and wear resistance, and is widely used in the manufacture of auto parts, mechanical parts, tools, etc. The following are some common application areas:

Auto parts: CR300B bake hardening steel can be used to manufacture auto engine parts, steering system parts, gearbox parts, brake system parts, etc.

Mechanical parts: CR300B bake hardening steel can be used to make various mechanical parts such as shafts, gears, hubs, swing rods, springs, etc.

Tools: CR300B bake-hardening steel can be used to make various tools, such as cold dies, cutting tools, molds, etc.

Manufacturing: CR300B bake-hardening steel can also be used to make other industrial components such as bearings, gears, sprockets, screws, etc.

What is the main role of CR300B bake hardening steel in automobiles

CR300B bake-hardening steel plays an important role in automobile manufacturing. Specifically, it can be used to manufacture automotive engine parts, gearbox parts, steering system parts, braking system parts, etc. These parts have an important impact on car performance and safety.

Here are some of the major automotive uses of CR300B bake-hardening steel:

Improve engine performance: CR300B bake-hardening steel can be used to manufacture engine accessories, such as crankshafts, camshafts, rocker arms, etc. These parts need to have high strength and high wear resistance to withstand the working load under extreme conditions such as high temperature and high pressure. Using CR300B bake-hardened steel increases the durability and performance of these components, which in turn improves overall engine performance.

Improve gearbox performance: CR300B bake-hardening steel can be used to manufacture parts such as gearbox gears, which require high strength, high wear resistance and high precision. The use of CR300B bake-hardened steel can increase the strength and hardness of the gears, prolong the service life, and improve the shifting smoothness and reliability of the transmission.

Improve the performance of steering system and braking system: CR300B bake hardening steel can be used to manufacture steering system components and braking system components, such as steering pins, brake discs, brake drums, etc. These components need to have high strength and high wear resistance to withstand conditions such as high speed driving and frequent braking. The use of CR300B bake-hardened steel increases the durability and performance of these components, increasing the safety and reliability of the entire steering and braking system.

Contact us

We are pleased to recommend our company’s CR300B bake-hardening steel products to you. As a high-strength, high-wear-resistant, high-precision steel, CR300B bake-hardening steel has been widely used in many fields, especially in automobile manufacturing, machinery manufacturing, tool manufacturing and other industries.

Our CR300B bake-hardening steel products adopt the most advanced production technology and strict quality control, which ensures the high quality and stability of the products. This product has excellent mechanical properties and heat treatment properties, and can meet customers’ requirements for high strength, high hardness, and high wear resistance of various parts. In addition, our CR300B bake-hardening steel products also have good weldability and machinability, which is convenient for customers to carry out secondary processing and assembly.

In addition to high-quality products, our company also provides comprehensive after-sales services, including technical consultation, technical support, product training, etc. Our technical team has rich experience and professional knowledge, and can provide customers with one-stop solutions and services.

If you are looking for high-quality CR300B bake-hardened steel products, and need high-quality pre-sales, sales, and after-sales services, we believe that our company is your best choice. We warmly welcome you to consult, negotiate and cooperate!