Weight, standard weight, organization of cast iron weight grey cast iron

Weight, standard weight, organization of cast iron weight grey cast iron
2017-12-04 Zhongyuan Weighing Apparatus Factory
1. Ferritic gray cast iron - the graphitization process is fully carried out;
2. Ferritic pearlite gray cast iron——*, the two-stage graphitization process is fully carried out, and the third stage graphitization process is carried out partially;
3, pearlite gray bead iron - *, the two-stage graphitization process is fully carried out, the third stage graphitization process is not carried out at all;
Gray cast iron performance:
The performance of gray cast iron mainly depends on the performance of the matrix and the quantity, shape, size and distribution of the graphite. Among them, the performance of gray cast iron composed of fine-grain pearlite matrix and fine-grained graphite is excellent, and the application range is wide.
2. The tensile strength and plasticity of gray cast iron are much lower than those of steel with the same matrix, but the graphite sheet has little effect on the compressive strength of gray cast iron, so gray cast iron is widely used as a part subjected to compressive load, such as machine base and bearing. Block and so on.
3. Gray cast iron has good casting performance and cutting performance, and the presence of graphite can play a role in reducing grinding and damping.
Metamorphic treatment (pregnancy treatment) - inoculation of cast iron
5. Deterioration treatment: Adding a modifier to the molten iron before casting to promote grain refinement.
The commonly used modifier is silicon iron containing 75% silicon, and the amount added is generally about 0.4% of the weight of the molten iron.
6. Performance: The strength of cast iron is greatly improved, and the plasticity and toughness are also improved.
Brief description of cast iron weight products: surface condition, in order to improve the corrosion resistance and hardness of the weight, the surface of the weight should have a suitable metal coating or coating.
1 weight structure: The weight can have an adjustment cavity, and the total volume of all adjustment chambers should not exceed 1/10 of the total weight of the weight. The cavity should be sealed, waterproof and dustproof. The adjustment chamber can be sealed with a threaded plug or button.
2 Weight material: The weight should be made of one or more pieces of material, and the material should have corrosion resistance equal to or better than gray iron.

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