How to choose the quenching medium in the heat treatment of fasteners
The comprehensive mechanical properties of the fasteners are mainly determined by the materials selected and the quality of the heat treatment, so it is imperative to select materials and improve the heat treatment level and quality strictly and reasonably. The heat treatment is divided into two processes of heating and cooling, and the two processes are scientifically controlled to obtain the desired heat treatment quality. Reasonable choice and scientific use of quenching media is the essence of controlling the cooling process.
1. For bolts, studs, screws, nuts and special-shaped non-standard parts with ML35 (32, 40), etc. due to the hardenability of the material, the quenching medium with faster cooling speed should be selected in the heat treatment process. In order to meet the hardness, metallographic and mechanical properties of the quenching of the parts.
1. The product size is M4-Ml6, you can choose 3-5% KR6480 polymer water-soluble quenching agent, if you choose 35#, 35A, 35S can be relaxed to M18--M20.
2, the product size is M10 ~ M24, you can choose 8 ~ 10% KR7280 water-soluble quenching agent.
3, the product size is larger than M24, you can choose lO ~ 15% KR7280 water-soluble quenching agent.
4, the product is mainly 45#, you can choose KR6480 or KR7280 according to the size of your product.
Second, bolts, bolts, screws, nuts and special-shaped non-standard parts with 35CrMo, 40Cr, 20MnTiB, 35VB, etc.
1. If your product is mainly 35CrMo or 40Cr, you can choose KRll8 quick quenching oil or 5-10% KR6480 polymer water-soluble quenching agent.
2. If your product is mainly 20MnTiB or 35VB, you can choose KR7280 or KR6480.
3, shallow carbon carburizing self-tapping screws and pin types such as low carbon steel 10#, 15#, 20#, 20Cr, 1018, 1022, 10B21 and other materials can be selected KR6480 or KRll8
4. Spring washers with 65Mn, 60Si2Mn, 70, etc., KRl18 quick quenching oil can be selected for retaining ring.
5. There are many types of products, and the size span is larger. KRll8 or KR6480 can be used (can meet the quenching and carburizing quenching of all alloy steels and carbon steel of certain size). The intrinsic 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 piece of heat treatment production cost.
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