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The difference between high-strength bolts and ordinary bolts
The name is different, the natural performance is different, usually high-strength bolts can bear more load than ordinary bolts of the same specification.
The material of ordinary bolts is made of Q235 (namely A3).
The material of high-strength bolts is 45# steel, alloy steel (such as 20MnTiB, 35VB) or other high-quality materials. After being made, heat treatment is carried out to improve the strength.
The difference between the two is the difference in material strength.
The first point: From the perspective of raw materials: (Guide: How to prevent the aging and corrosion of screws)
High-strength bolts are made of high-strength materials. The screws, nuts and washers of high-strength bolts are all made of high-strength steel, commonly used 45 steel, 40 boron steel, and 20 manganese titanium boron steel. Ordinary bolts are usually made of Q235 steel.
The second point: From the perspective of intensity level:
Two strength grades of 8.8 and 10.9 are commonly used, of which 10.9 is the majority. The strength grade of ordinary bolts is lower, generally 4.4, 4.8, and 5.6. (8.8S and 10.9S are dedicated for steel structure)
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