Fasteners are a common component used for mechanical attachment and fixing. The heat treatment process of the fastener is divided into two processes of heating and cooling, and the two processes can be reasonably controlled to obtain the desired heat treatment quality.
(1) Bolts, studs, screws, nuts and special-shaped non-standard parts mainly based on ML35 (32, 40), etc. Due to the problem of hardenability of materials, such parts should be cooled faster during heat treatment. Quenching medium to meet the requirements of hardness, metallographic structure and mechanical properties of parts quenching.
1 When the product specification is M4 ~ M16, you can choose 3% ~ 5% KR6480 polymer water-based quenching agent, if you choose 35, 35A, 35S steel, you can relax to M18 ~ M20.
2 When the product specification is M10 ~ M24, 8% ~ 10% KR7280 water-soluble quenching agent can be selected.
3 When the product specification is larger than M24, 10%~15% KR7280 water-based quenching agent can be selected.
4 When the product is mainly made of 45 steel, KR6480 or KR7280 can be selected according to the size of the product.(2) For bolts, studs, screws, nuts and special-shaped non-standard parts mainly composed of 35CrMo, 40Cr, 20MnTiB, etc., the quenching medium selected is as follows.
1 The product is mainly composed of 35CrMo and 40Cr, and KR118 quick quenching oil or 5%-10% KR6480 polymer water-soluble quenching agent can be selected.
2 The product is mainly composed of 20MnTiB and 35VB, and quenching agents such as KR7280 or KR6480 can be selected.(3) Shallow carburizing self-tapping screws and pins, such as low carbon steel 10, 15, 20, 20Cr, 1018, 1022, 10B21, etc., may use quenching agents such as KR6480 or KR118.
(4) KR118 quick quenching oil can be selected for spring washers, retaining rings, etc., mainly 65Mn, 60Si2Mn, 70 steel, etc.
(5) KR1188 or KR6480 can be used for a wide range of products and large spans. It can meet the quenching and carburizing quenching quality of all alloy steels and carbon steels of certain sizes.
SBS prefabricated building is a new type environmental friendly product that adopts steel structure as frames, various plates and panels as surrounding protection system, high strength bolts as component connection. The metal frame buildings are mainly used as modular house, office, cleaning workshop, cold storage room, wide span workshop, warehouse, exhibition hall,stadiums , hangars, steel-structure supermarkets, high-rise steel constructions, logistics center, container house and so on.
Steel Garage,Container House Garage,Large Parking Platform,Steel Structure Metal Garage
Foshan Shengbang Steel Structure Co.,Ltd , https://www.sbsstructure.com