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Alloy steel casting quality and quenching of low carbon low alloy steel castings
- Jul 09, 2018 -

An alloy steel casting, that is, a casting obtained by casting the steel of the alloy steel. Therefore, we should have a deep understanding and understanding of this kind of casting, in order to know what it is and how to use it correctly and correctly, in order to obtain good use effect and economic benefit, so that the casting can play a role and avoid the product. waste.


1. Understanding of alloy steel in alloy steel castings

Alloy steel castings, which use alloy steel. Alloy steel, which is a type of steel, is made of other alloying elements in steel and can be a variety of alloying elements. If different elements are added and a suitable processing technique is employed, then high strength, high toughness alloy steel can be obtained, and good wear resistance, corrosion resistance and high and low temperature resistance can also be obtained.


2. Alloy steel casting quality and its influencing factors

The quality of alloy steel castings, from a professional point of view, is the use of quality, connotation quality and appearance quality. The connotation quality refers to the metallographic arrangement of the casting and the holes, cracks, segregation and noisy existing in the casting. The external quality refers to the appearance roughness, appearance defects, dimensional error and shape error of the casting. And component error. The quality of the alloy steel castings refers to the performance of the casting under different conditions, including wear resistance, corrosion resistance, fatigue, shock absorption and cutting performance. In addition, there is a property of the weldability of the casting.


Alloy steel castings, which have some influencing factors, if you do not pay attention to these influencing factors, then there may be defects in the castings such as pores, pinholes, slag inclusions, cracks and pits. Therefore, we should have a clear understanding and correct understanding of these influencing factors so as to avoid adverse effects and ensure the quality of castings.


3. Quenching of low carbon low alloy steel castings

Quenching of low carbon low alloy steel castings is an important process. However, due to its low carbon content and low alloy composition, there are some specific requirements for quenching to ensure this alloy steel casting. The quenching quality, its specific requirements are: after quenching, the hardness should reach above 400HB, and the martensite content should be above 90%. In the quenching temperature, the requirement is not more than 30 degrees Celsius, and the liquid flow rate in quenching should be greater than 0.6 m/s. At the same time, the transfer time should be strictly controlled to ensure a good quenching effect.