Correct selection of quenching medium in heat treatment of fasteners

Fasteners are a kind of general parts used for mechanical connection and fixation. It has the characteristics of rich variety, complex shape and size, and various materials.

Fasteners are widely used in machinery, automobiles, aviation, aerospace, construction, transportation, communications, electronic appliances and many other industries. Each industry has a variety of different requirements for fasteners, including different Comprehensive mechanical properties. The comprehensive mechanical properties of fasteners are mainly determined by the selected materials and the quality of heat treatment, so it is imperative to select materials strictly and reasonably and improve the level and quality of heat treatment.

Heat treatment is divided into two processes, heating and cooling, and the ideal heat treatment quality can be obtained by scientifically controlling the two processes. Reasonable selection and scientific use of quenching medium is the essence of controlling the cooling process. The following will share with you the company's long-term work experience in the fastener heat treatment industry.

1. Bolts, studs, screws, nuts and special-shaped non-standard parts mainly based on ML35 (32, 40) etc. Due to the problem of material hardenability, such parts should be cooled faster in the heat treatment process. The quenching medium can meet the requirements of hardness, metallography and mechanical properties of parts quenching.

I. The product size is M4-Ml 6, you can choose 3-5% KR6480 polymer water-soluble quenching agent, if you choose 35#, 35A, 35S can be relaxed to M18--M20. (Guide: How to distinguish fake and inferior steel in appearance)

II. The product size is M10～M24, you can choose 8～10% KR7280 water-soluble quenching agent.

III. If the product size is larger than M24, 10～15% KR7280 water-soluble quenching agent can be selected.

IV, the product is mainly 45#, you can choose KR6480 or KR7280 according to the size of your product.

2. Bolts, bolts, screws, nuts and special-shaped non-standard parts based on 35CrMo, 40Cr, 20MnTiB, 35VB, etc.

I. If your product is mainly 35CrMo, 40Cr, you can choose KRll8 quick quenching oil or 510% KR6480 polymer water-soluble quenching agent.

Ⅱ. If your product is mainly 20MnTiB, 35VB, you can choose KR7280 or KR6480.

Three, low-carbon steel 10#, 15#, 20#, 20Cr, 1018, 1022, 10B21 and other materials based on shallow carburizing self-tapping screws, pins, etc. can choose KR6480 or KRll8

Four. Spring washers and retaining rings mainly made of 65Mn, 60Si2Mn, 70, etc. can use KRl18 quick quenching oil.

5. There are many types of products, and KRll8 or KR6480 (which can meet the quenching and carburizing quenching of all alloy steels and carbon steels of a certain size) can be selected for larger size spans. The intrinsic quality of the workpiece depends on the heat treatment quality. Quenching medium plays a decisive role in heat treatment, but it is the smallest piece of heat treatment production cost. As long as you pay a little attention to the quenching medium and choose professional and reliable products, you can enjoy professional consultation, after-sales service, and To achieve unexpected results, and greatly reduce the overall production cost.

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