Carbon steel black zinc plated m1 m2 m3 m4 m5 precision screw

Industry knowledge：

What Is The Heat Treatment Method For Screws

Heat treatment is divided into two processes: heating and cooling. The ideal heat treatment quality can be obtained by scientifically controlling the two processes. Rational selection and scientific use of quenching medium is the essence of controlling cooling process. For bolts, studs, screws, nuts and non-standard non-standard parts mainly made of ML35(32, 40) due to the problem of hardenability of materials, the quenching medium with faster cooling speed should be selected for such parts in the heat treatment process, so as to meet the requirements of hardness, metallography and mechanical properties of parts. Product size is M4-ML6, you can choose 3-5% KR6480 polymer water-soluble quencher, if you choose 35#, 35A, 35S can be relaxed to M18–M20. Product size is M10 ~ M24, you can choose 8 ~ 10%KR7280 water-soluble quench. Product size larger than M24, lO ~ 15%KR7280 water-soluble quench can be selected. The products are mainly 45#, you can choose KR6480 or KR7280 according to the size of your product. To 35CrMo, 40Cr, 20MnTiB, 35VB bolts, screws, nuts and special-shaped non-standard parts.