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Selection of quenching medium in fastener processing

Selection of quenching medium in fastener processing

Fasteners are universal parts used for mechanical connection and fixation. It has a variety of features, shape and size complex, a wide selection of materials.

Fasteners are widely used in many industries, such as machinery, automobile, aviation, aerospace, construction, transportation, communication, electronics and electrical appliances. The comprehensive mechanical properties of fasteners are mainly determined by the materials selected and the quality of heat treatment, so it is imperative to select materials strictly and rationally and improve the level and quality of heat treatment.

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

1. For the bolts, studs, screws, nuts and special-shaped non-standard parts of ML35(32, 40), etc., due to the problem of material hardenability, the quenching medium with faster cooling speed should be selected in the heat treatment process, so as to meet the requirements of quenching hardness, metallics and mechanical properties of the parts.

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.

Ⅱ, product size is M10 ~ m2-m24. You can choose 8 ~ 10% KR7280 water soluble quenchant.

Ⅲ, product size is larger than m2-m24, can choose KR7280 lO ~ 15% water soluble quenchant.

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

Bolts, studs, screws, nuts and shaped non-standard parts mainly made of 35CrMo, 40Cr, 20MnTiB, 35VB, etc

I. if your product is based on 35CrMo and 40Cr, you can choose KRll8 fast quenching oil or 5-10% KR6480 polymer water-soluble quenching agent.

Ⅱ, if your product is given priority to with 20 mntib, 35 vb can choose KR7280 or KR6480.

3. KR6480 or KRll8 can be selected for shallow carburizing self-tapping screws and pins made of low carbon steel 10#, 15#, 20#, 20Cr, 1018, 1022, 10B21 and other materials

4. KRl18 fast quenching oil can be selected for spring washer and baffle ring with 65Mn, 60Si2Mn and 70, etc.

The internal quality of the workpiece is determined by the heat treatment quality. The quenching medium plays a decisive role in the heat treatment, but it is the smallest part of the heat treatment production cost. As long as a little attention is paid to the quenching medium, professional and reliable products can be selected to enjoy professional consultation and after-sales service, with unexpected results, and greatly reduce the comprehensive production cost.


1. KR6480 is a water-soluble quenching agent with strong universality (long term use in Shanghai no. 5 plant)

2. KR7280 is the world's fastest water-soluble quenching agent (excellent new product of general components association), widely used in Europe

3. KRll8 is the world's fastest quenching oil with very strong material compatibility.

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