HT250 is the grade for gray 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.
- Carbon (C): 3.16-3.30
- Silicon (Si): 1.79-1.93
- Manganese (Mn): 0.89-1.04
- Sulfur (S): 0.094-0.125
- Phosphorus (P): 0.120-0.170
- Tensile Strength (Rm): 250 MPa
- Hardness (RH=1): 209 HB
- Specimen Size: Bar Diameter: 30 mm
- 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.
- 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.
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:
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.
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:
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.
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