How to choose the correct quenching medium in the heat treatment of fasteners

Fasteners are a kind of universal parts used for mechanical connection and fixation. It has the characteristics of abundant varieties, messy shapes and scales, and a variety of raw materials.

Fasteners are widely used in many occupations such as machinery, cars, aviation, aerospace, construction, transportation, communications, electronic appliances, etc. Each occupation has a variety of different requirements for fasteners, including different Summarize the mechanical properties. The generalized mechanical properties of fasteners are primarily 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 scientific control of the two processes can obtain the desired heat treatment quality. Reasonable selection and scientific use of quenching medium are 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 fastener heat treatment profession.

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

I. The product standard 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: The selection of fasteners is principled)

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 products are mainly 20MnTiB and 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

4. Spring washers and retaining rings mainly made of 65Mn, 60Si2Mn, 70, etc. can be selected with KRl18 quick quenching oil.

5. There are many varieties of products, and KRll8 or KR6480 (which can satisfy the quenching and carburizing and quenching of all alloy steels and carbon steels of a certain size) can be selected for larger scale spans. The inner 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 Unexpected effect, and greatly reduce the induction production cost.

More related press machinery industry news: