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Material name: gray iron 200
Standard: GB/T 9439-2010
Refers to gray cast iron with a minimum tensile strength of 200MPa.
Carbon C: 3.16 ~ 3.30
Silicon Si: 1.79 ~ 1.93
Manganese Mn: 0.89 ~ 1.04
Sulfur S: 0.094 ~ 0.125
P: 0.120 ~ 0.170
Mechanical properties of
Tensile strength Rm (MPa) : 250
Hardness: (RH=1)209HB sample size: test bar diameter: 30mm
It has good strength , it’s resistant to abrasion and heat, possesses good vibration reduction, and excellent casting performance, which requires manual aging treatment.
Can be used for pump shells, containers, towers, flanges, packing box bodies and glands, carbonization towers, nitrification towers etc. Also employed in manufacturing, machine beds, columns, cylinders, gears and surface quenching parts.
Due to its resistance to deformation by heat, it is employed in high temperature environments.
Specification and organization
Heat treatment specification :(determined by the supplier, the following is the heat treatment specification for a sample for reference) in as-cast condition
Microstructure: flake graphite + pearlite
The HT250 can be quenched up to HRC60, but gray cast iron (HT200, HT250, etc.) is generally used in annealing or normalizing state without quenching. If hardness is required locally, high and medium frequency quenching is acceptable.
Medium frequency quenching: 3~5 mm hardening layer, hardness HRC50, the workpiece deformation is small.
High frequency quenching: 1~2 mm quenching layer, quenching temperature is 850, surface hardness HRC50 or above; Quenching temperature 900~1000 degrees, surface hardness up to HRC60.