How To Choose The Correct Quenching Medium For Fasteners in Heat Treatment

 Fasteners are a general-purpose component used for mechanical connection and fixation. It has the characteristics of rich varieties, complex shapes and scales, and a variety of raw materials.

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

Heat treatment is divided into two processes of heating and cooling, and the ideal heat treatment quality can be obtained by scientifically controlling the two processes respectively. Reasonable selection and scientific use of quenching medium is the essence of controlling the cooling process. The following will share with us the experience of our company working for a long time in the heat treatment of fasteners.

1. Bolts, studs, screws, nuts, and special-shaped non-standard parts, mainly ML35 (32, 40), etc. Due to the problem of material hardenability, such parts should use a quenching medium with a faster cooling rate during the heat treatment process , so as to meet the requirements of the hardness, metallographic and mechanical properties of parts quenched.
     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. 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 main product is 45#, you can choose KR6480 or KR7280 according to the size of your product.

2. Bolts, studs, screws, nuts and special-shaped non-standard parts mainly 35CrMo, 40Cr, 20MnTiB, 35VB, etc.
    I. If your products are mainly 35CrMo and 40Cr, you can choose KRll8 rapid quenching oil or 5-10% KR6480 polymer water-soluble quenching agent.
    Ⅱ. If your products are mainly 20MnTiB and 35VB, you can choose KR7280 or KR6480.

3. KR6480 or KRll8 can be used for shallow carburized self-tapping screws and pins mainly made of low carbon steel 10#, 15#, 20#, 20Cr, 1018, 1022, 10B21, etc.

4. KRl18 rapid quenching oil can be used for spring washers and retaining rings mainly made of 65Mn, 60Si2Mn, 70, etc.

5. There are many types of products and large scale spans. You can choose KR118 or KR6480 (which can satisfy the quenching and carburizing and quenching of all alloy steels and carbon steels of a certain scale). The internal quality of the workpiece depends on the quality of heat treatment. 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 quenching medium and choose professional and reliable products, you can enjoy professional consultation and after-sales service. Unexpected effects can be expected, and the comprehensive production cost can be greatly reduced.