XEX

Gray cast iron

by:XEX     2021-02-18
Gray cast iron heat treatment: 1. 2 stress relief annealing. To improve the cutting machining annealing 3. Surface hardening the density of gray cast iron grey cast iron HT250 or higher and HT220 or less, the density of 7 respectively. 35 g/cm after 7. 2g/cm³[ Mechanical properties of] : the mechanical properties of gray cast iron is associated with matrix organization and graphite morphology. Flake graphite of gray cast iron substrate fragmentation serious, easy cause stress concentration on the graphite Angle, the tensile strength of gray cast iron, plasticity and toughness is far lower than the steel, but the compressive strength of steel and its mechanical properties is also commonly used in cast iron cast iron with the worst. At the same time, the mechanical properties of gray cast iron substrate has a certain influence, ferritic matrix of gray cast iron graphite flake is bulky, strength and hardness of the lowest, so the application is less; Pearlitic matrix of gray cast iron graphite tiny, have higher strength and hardness, is mainly used to manufacture the casting more important; A ferrite pearlite matrix of gray cast iron graphite flake is pearlite grey cast iron is a bit thick, performance is better than pearlitic gray cast iron. So the industry is more use of pearlitic gray cast iron matrix. The organization and properties of gray cast iron gray cast iron [ Organization] : but as the carbon steel substrate with flake graphite. According to different gray cast iron matrix was divided into three categories: ferritic matrix gray cast iron; A ferritic pearlitic gray cast iron matrix; Gray cast iron pearlite matrix. ( Other performance] : a good cast performance, good vibration resistance, good wear resistance, good machinability, low notch sensitivity
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