HT250 Cast Iron

HT250 is a grade of gray cast iron, with "HT" standing for gray mouth cast iron, an abbreviation of the Chinese phonetic spelling for gray cast iron. According to the GB/T 9439-2010 standard, HT250 indicates a minimum tensile strength of 250MPa for a 30mm diameter test sample.

HT represents gray cast iron, with HT being the abbreviation for gray cast iron in Chinese Pinyin. Gray cast iron HT250 indicates the minimum tensile strength of ø30 specimen is 250MPa.

Other Characteristics

- Good strength, wear resistance, and heat resistance
- Excellent vibration damping
- Superior casting performance, requires artificial aging treatment
- Application Range: Suitable for pump casings, containers, tower vessels, flanges, packing box bodies and covers, carbide towers, nitration towers, etc. Also used for machining bed bodies, columns, cylinders, gears, and parts that require surface quenching.
- Due to its small thermal deformation, it is commonly used in high-temperature environments.

Specifications and Structure

- Heat Treatment Specifications: (To be specified by the supplier; the provided details are for reference)
- Microstructure: Flake graphite + pearlite

HT250 can achieve HRC60 with quenching, but gray cast iron (HT200, HT250, etc.) is generally used in annealed or normalized conditions, not subjected to quenching treatment. If hardness is required in specific areas, high or medium-frequency quenching can be performed.

- Medium-Frequency Quenching: Quenching depth of 3-5 mm, hardness HRC50, minimal workpiece deformation.
- High-Frequency Quenching: Quenching depth of 1-2 mm, quenching temperature 850°C, surface hardness above HRC50; quenching temperature 900-1000°C, surface hardness can reach HRC60.

Heat Treatment Specifications

The heat treatment specifications for HT250 are typically determined by the supplier. Generally, HT250 is used in the as-cast or normalized condition without quenching. If local hardness is required, high or medium frequency quenching can be applied:

• Medium frequency quenching: A hardening layer of 3~5mm with a hardness of HRC50 and minimal workpiece distortion.
• High frequency quenching: A hardening layer of 1~2mm, with a quenching temperature of 850 for a surface hardness of HRC50 or above; quenching temperatures of 900~1000 degrees can achieve a surface hardness of HRC60.

Applications

HT250 is used in the manufacture of pump casings, containers, towers, flanges, packing box bodies and glands, carbonization towers, nitration towers, etc. It is also used in the production of machine tool beds, columns, cylinders, gears, and parts that require surface hardening. Due to its low thermal deformation, it is commonly used in high-temperature environments.

Conclusion

HT250 gray cast iron, as an important industrial material, has demonstrated exceptional performance across various fields due to its unique chemical composition and optimized heat treatment processes. Its high strength, good wear resistance, and heat resistance, along with appropriate plasticity and toughness, make it an ideal material for many industrial applications. From pump casings and containers to machine tool beds and high-temperature applications, HT250 has proven its reliability and strength.

Through an in-depth analysis of the chemical composition, mechanical properties, heat treatment specifications, and application range of HT250 gray cast iron, the following conclusions can be drawn:

• Precise control of chemical composition provides the foundation for HT250's high strength, good wear resistance, and heat resistance, while also ensuring damping properties and certain corrosion resistance.
• Excellent mechanical properties make HT250 an ideal material for manufacturing components that withstand heavy loads and wear.
• The appropriate application of heat treatment technologies further enhances the performance of HT250, ensuring stable performance in different working environments.
• The wide range of applications demonstrates the versatility and adaptability of HT250 gray cast iron, meeting the strict requirements of industrial applications in various fields.

Overall, the high strength, good wear resistance, and heat resistance of HT250 gray cast iron, along with its appropriate plasticity and toughness, make it a preferred material for many industrial applications. With continuous technological advancements and innovations, the application fields of HT250 gray cast iron will further expand, and its performance is expected to be further improved.

HT250 Gray Cast Ductile Iron Sleeve Wear

Our HT250 gray cast iron wear sleeves are precision cast industrial wearing parts with superior abrasion resistance and stable mechanical performance. Made of standard HT250 grey cast iron material, these ductile iron sleeves feature high hardness, good shock absorption and low deformation, perfectly suited for heavy load friction working conditions. Widely used to protect mechanical shafts, pumps, valves and various transmission components from long-term wear and tear. We support OEM customization according to customer drawings and samples.