Versatile machine bed can be used for instruments, electronics, light industry, standard parts, bearing industry, the auto parts industry and other parts of the process, especially for non-ferrous metals. Machine bed according to GB9439-88 standards for manufacturing, 
 Machine bed features: 
 (1) good wear resistance and shock dissipation. Graphite cast iron in favor of the lubrication and oil storage, so the wear resistance. Similarly, the presence of graphite and gray cast iron consumption shock than steel. 
 (2) process performance. The gray cast iron with high carbon content, is close to eutectic composition, it is a relatively low melting point, good fluidity, shrinkage is small, so is suitable for complex or thin-walled castings foundry. In addition, when cutting the graphite to form a chip breaking easily, so can be gray cast iron machining is better than steel. 
 Machine bed between hardness and tensile strength: the hardness and tensile strength of gray cast iron between the existence of a certain relationship, the empirical formula is: 
 1, the time when the O ≥ 196N/mm m HB = RH (Flight 00 +0 4380b) (B1) 
 2, the time when 0 ≥ 796N/mm m HB = RH (44 + O 7240b) (B2) 
 Where the relative hardness (RH) value is mainly composed of raw materials, melting process, treatment process and casting cooling rate determined by 

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