As an important work and wear-resistant part of the impact crusher, the blow bar is the part that directly breaks the material in the impact crusher. According to different use scenarios, the blow bar with appropriate material can be more suitable for on-site production.
The following describes several common blow bar materials and applicable working conditions.
1. Martensite
Often called alloy steel, it has poor wear resistance than high chromium, but good toughness, low yield and better safety. It is recommended to break and recycle garbage, asphalt and concrete. For natural stone, it is generally suitable for the initial breaking of counter-breaking. Martensite is not recommended for grinding materials with low consumption, such as limestone
2. Ceramic sandwich martensitic steel
Martensitic steel matrix mixed with ceramic sandwich. This mixed material combines the hardness of ceramics and the mechanical properties of steel, and its service life is 2 – 4 times that of a single alloy blow bar. It can be used for recycling construction waste, concrete, and natural stone with low iron content
3. High chromium
The natural property of high chromium is high hardness, but poor toughness, good wear resistance, poor impact resistance and easy to break. It is recommended to use secondary crushing for crushing natural stones or river pebbles, followed by recycling. Asphalt can be used, concrete with reinforcement is not recommended, and construction waste and limestone with low abrasion are not recommended.
4. High chromium and ceramic
The combination of chrome steel matrix and ceramic sandwich can ensure stable wear profile, especially for abrasive pre-crushing materials in gravel pits and quarries. After adding ceramic to the high chromium blow bar, it is similar to the applicable working conditions of the single high chromium material. It is not recommended to build concrete with steel bars, and it is not recommended to build concrete with low abradability, such as construction waste and limestone.
High chromium and high chromium ceramics need to control the feeding size, which is not suitable for breaking the head, and for making concrete with reinforcement (milling material without iron)
5. High manganese steel
In addition to the tooth plate cone, manganese steel can also be applied to the blow bar. The blow bar of high manganese steel can form work-hardening during impact wear, thus giving full play to its potential wear resistance.
Recommended for materials with less abrasion, such as limestone; When the feeding size is very large; When the feeding material contains more unbreakable substances (such as iron), or when the use of other blow bars is not cost-effective.
6. High manganese steel and alloy rod
It is a better scheme at present, taking into account the toughness and wear resistance of the blow bar. Although many broken raw materials are very soft, sometimes the feed size is large, and in many cases the feed size is more than 1 meter. Considering this impact, it is relatively safe to use high manganese steel.
Summary
The selection of blow bar should be based on the actual practical situation of the site. It is not necessarily that the highest price is the most suitable, and the hardness is not necessarily the most suitable.
Three kinds of materials are divided from hardness: high chromium blow bar > martensitic blow bar > high manganese steel blow bar
Three kinds of materials are divided in terms of toughness: high chromium blow bar < martensitic blow bar < high manganese steel blow bar
