Generally, Grade 35 steel can produce 5.8 grade anchor bolts without heat treatment, while Grade 45 steel can produce 6.8 grade anchor bolts without heat treatment. However, 8.8 grade anchor bolts require heat treatment of Grade 45 steel. For smaller size anchor bolts, the heat treatment effect is often unsatisfactory, with over-processing directly leading to increased brittleness and a higher grade. To address this issue, materials with higher initial grades and less sensitivity to heat treatment, such as 40Cr steel, should be chosen.
When selecting anchor bolts, consider the actual usage environment and avoid盲目 opting for high-grade ones. Otherwise, the loss is not just monetary but also includes the wasted time and materials during anchor bolt installation. When seeking to purchase high-quality anchor bolts, understanding the brand's raw materials can generally indicate the merchant's positioning and professional integrity.