The machine castings can be called large castings

Product line manufacturing cast iron machine bed castings series: undertake real (LFC), resin sand casting process, including the turbine plant pad box, the bed of the machine tool plant, columns, beams, workstations, machinery and equipment and reasonable structurestable, high precision, wear-resistant, long life, casting material: gray iron HT250 (GB/T9439-88); casting method: resin sand. Casting mechanical properties: tensile strength: ≥ 250N/mm2 hardness: HB = 190 ~ 240

Relationship between hardness and tensile strength: between hardness and tensile strength of gray cast iron, there is a certain correspondence between their experience in relation to:

1, when the O ≥ 196N/mm ㎡

HB = RH (fly 00 +0 4380b) (B1)

2, m 0 ≥ 796N/mm

HB = RH (44 + O 7240b) (B2)

Where the relative hardness (RH) value is mainly determined by the cooling rate of the raw materials, melting process, process and casting.

The casting full compliance with the chemical composition of the HT250 standards and mechanical performance test standards.