Factors affecting the quality of fasteners by heat treatment

The heat treatment process is characterized by varying the internal structure of the material to achieve the desired properties and qualities of the various fasteners, which typically do not change the shape of the material or fastener. Since the quality characteristics of the products imparted by the heat treatment are often unintuitive internal qualities (such as tensile strength, section shrinkage, elongation, etc.), in order to ensure the quality of the heat treatment, it is generally necessary to use fasteners for special equipment. Or with the furnace sample for testing, but due to the inspection sampling rate and inspection site restrictions, for each type of fasteners or even each heat of the fasteners, the inspection is partial or individual, very It is difficult to detect 100% of the heat treatment quality. Therefore, all test results do not fully reflect the heat treatment quality of the entire batch of fasteners or the entire fastener.

Since the heat treatment is produced according to the batch quantity or continuous production of the furnace, once the quality of the heat treatment occurs, the loss is lost. In the event of a heat treatment defect, a serious mechanical failure is likely to occur, resulting in an incalculable loss. Therefore, strict control of the entire process of heat treatment production, the implementation of comprehensive quality management is particularly important for the heat treatment process. The ISO9000 series certification work in the fastener industry has special significance and has received widespread attention. Heat treatment production is inseparable from other production processes, which are inseparable from the four elements of Man, Machine, Material, and Method. (Man, Machine, Material, Method, 4M for short), here are not considered environmental protection, they are the main factors affecting the quality of heat treatment products. Mutual influence and mutual restraint ultimately determine the quality of fastener heat treatment.

The heat treatment process has a critical impact on high strength fasteners, especially its intrinsic quality. Therefore, in order to produce high-quality high-strength fasteners, advanced heat treatment processes and heat treatment process control are required.

The heat treatment can ensure that the high-strength fasteners have the required mechanical strength, good plasticity, toughness and low notch sensitivity, high bending strength, and avoid the occurrence of slack and other comprehensive mechanical properties and performance. The quality and reliability of fasteners enhance the market competitiveness of fastener products.

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