nydcastings

lost foam steel castings

Mechanism and prevention of surface carbonization of lost foam steel castings

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When using lost foam casting to produce steel castings, surface carbonization of castings has always been a controversial topic. When using EPS pattern materials, low carbon steel (such as ZG25) castings are prone to surface carbonization, but when using STMMA pattern materials, there is almost no surface carbonization on the surface of steel castings. For […]

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crack defects

Causes of crack defects in high manganese steel castings

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1. Chemical composition factors Influence of carbon content: If the carbon content is too high, greater thermal stress and structural stress will be generated during the solidification process of the casting. Because high-carbon high-manganese steel will undergo eutectoid transformation during solidification, the volume changes, which can easily lead to cracks. Influence of sulfur and phosphorus

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low-carbon steel castings

How to carburize low-carbon steel castings?

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What is the purpose of carburizing low-carbon steel castings? Improve surface hardness and wear resistance Low-carbon steel castings have low carbon content, insufficient surface hardness and wear resistance. Carburizing can significantly increase the carbon content on the surface of steel parts. After quenching and tempering, tempered martensite and carbides form on the surface. The hardness

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Sand Sticking Problem of Shell

Analysis and Improvement of Sand Sticking Problem of Shell

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For the sand sticking problem of clutch shell casting in the workshop, the possible causes of the problem were analyzed according to the production situation of the workshop. The cause-effect diagram of sand sticking problem of clutch shell casting was drawn by using quality analysis method. Measures were formulated and verified in production to determine

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coated sand

Selection of raw materials for coated sand

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Coated sand is generally composed of aggregate, binder, curing agent, lubricant and special additives. 1. Aggregate Aggregate is the main component of coated sand. The requirements for aggregate are: high refractoriness, low volatile matter, relatively round particles and high strength. Natural scrubbed silica sand is generally used, mainly because of its abundant reserves, low price

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tempering

What effects does tempering have on different steel castings?

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Carbon steel castings Changes in mechanical properties: Tempering can eliminate quenching internal stress, reduce hardness and strength, and improve toughness and plasticity. For example, high carbon steel castings have high hardness and high brittleness after quenching. After low temperature tempering, they can greatly improve toughness while maintaining a certain hardness, so that they can meet

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