Detailed explanation of the material of the anchor bolts, the following small-scale expansion anchor manufacturers Xiaobian for everyone to introduce:
Building anchor bolts include chemical anchor bolt series and mechanical anchor bolt series. Here, chemical anchor bolts and bottom anchor bolts are taken as examples to analyze how to choose the anchor bolt material.
Compared to chemical anchors and bottom anchors, the above material selection is only for the screw, not the sleeve and the flat three-piece. We know that the national standard for both chemical anchors and bottom anchors is divided into several grades, including 4.8, 5.8, 6.8 and 8.8. Da Li mainly ships 5.8 and 8.8.
Let's take a look at the types of commonly used steels. Q195 steel, Q235 steel, 35# steel, 45# steel, 40Cr steel, etc. are used to make anchor bolts. Q195 steel and Q235 steel are ordinary carbon structural steel; 35# steel, 45# steel is a high-quality carbon structural steel with moderate carbon content; 40Cr steel also belongs to alloy medium carbon steel with carbon content between 35# steel and 45# steel.
Material selection of 4.8 anchor
We generally use Q195 steel and Q235 steel as the material of the 4.8-level anchor bolt, and the standard can be achieved without heat treatment after processing. Compared with other steels, these two steels have the lowest price, and Q235 steel is widely used, far exceeding other steels.
Material selection of 5.8 anchor
The bearing capacity of the 5.8-level anchor is slightly higher than the 4.8 level, so the material produced has also changed. We use 35# steel to make the 5.8-level anchor. After the completion of the production, we can directly reach the 5.8 standard without any additional conditioning. deal with.
Material selection of 6.8 anchor
When the anchor bolt grade is required to reach 6.8 grade, 45# steel can be used as the material. After completion, the standard can be basically reached, and the heat treatment of 35# steel can also be selected to reach the corresponding strength.
Material selection of 8.8 anchor
The 8.8 grade anchor will basically use 45# steel as the material and then heat treatment to reach 8.8 strength. Some merchants will use 35# steel heat treatment to reach the 8.8 standard, but 35# steel has a high probability of problems during heat treatment, and the large dispersion results in unstable mechanical properties and high brittleness. Da Li's 8.8-level anchors do not use 35# steel as raw material.
However, 45# steel also has relative instability during heat treatment, especially for small-size anchor bolts. When the surface of the material reaches 8.8-level strength, the inside of the steel may have reached 10.9-level strength, so that the mechanical properties of the anchor bolts exceed 8.8. However, its brittleness is high, and it is difficult to pass through the bending experiment. The 40Cr steel with a relative price higher than half of 45# steel will not have such a problem. Its comprehensive performance is very good, the initial grade is also close to 8.8, and the heat treatment sensitivity is lower, so 40Cr steel is more suitable for small specifications. (M12 and below) anchor bolts, 45# steel can be used as the processing material for large size (M16 and above) anchor bolts.
Application of stainless steel materials
The stainless steels commonly used for anchor bolts are made of 304 and 316. The chemical properties are stable and the mechanical properties are good. The overall performance of the bolts using stainless steel as the material is better, but the price is more expensive, and the actual amount is not much. Taihao Warehouse Haojing Technology Co., Ltd. is located in No. 188, Luxin Road, Taicang City. It is a professional manufacturer of expansion screws.
