Choosing the right stud bolt material requires comprehensive consideration of factors such as the operating environment, mechanical performance requirements, corrosion resistance, and cost. Different materials are suitable for different working conditions.
1. Carbon Steel: High cost-performance ratio, suitable for general environments.
Features: Moderate strength, low cost, good machinability, but prone to corrosion.
Applicable Scenarios: Dry, normal temperature, non-corrosive environments, such as indoor mechanical assembly, general building structures, furniture connections, etc.
Strength Grade: Commonly 4.6 and 8.8 grades, with 8.8 and above being high-strength bolts suitable for general structural connections.
2. Stainless Steel: Strong corrosion resistance, suitable for harsh environments.
Features: Rust-proof, acid and alkali resistant, moisture resistant, smooth surface, long service life.
Common Grades:
SUS304 (A2-70): General-purpose stainless steel, suitable for general corrosive environments, such as food equipment and indoor piping.
SUS316 (A4-70): Contains molybdenum, offering enhanced resistance to chloride ion corrosion, suitable for highly corrosive environments such as marine engineering, chemical engineering, and shipbuilding.
Strength Grade: Stainless steel bolts are marked with strength grades such as "A2-70," where the number "70" indicates a tensile strength of 700 MPa.
3. Alloy Steel Material: High strength and high toughness, used in harsh working conditions.
Features: Strength, heat resistance, and fatigue resistance are improved by adding alloying elements such as chromium, molybdenum, and vanadium. After heat treatment, strength grades can reach 10.9 or even 12.9.
Applicable Scenarios: Bridges, wind power equipment, aerospace, high-temperature furnaces, and other high-load or extreme temperature environments.
Typical Materials: 35CrMo, 42CrMo, SCM435, etc., possessing excellent comprehensive mechanical properties.
