Common materials for stud bolts include carbon steel, stainless steel, and alloy steel. Different materials are suitable for different working conditions to meet performance requirements such as strength, corrosion resistance, and high-temperature resistance.
1. Carbon Steel
Features: High strength, low cost, the preferred material for ordinary working conditions.
Applicable Scenarios: Suitable for dry, normal temperature, and non-corrosive environments, such as general mechanical assembly and building structural connections.
Performance Grades: Common grades include 4.8, 8.8, 10.9, and 12.9. Grades 8.8 and above are high-strength bolt steels and require heat treatment (quenching + tempering) to improve performance.
2. Stainless Steel
Features: Excellent corrosion resistance and oxidation resistance, suitable for humid, acidic, alkaline, or outdoor environments.
Common Types:
A2-70 (SUS304): General-purpose austenitic stainless steel, suitable for general corrosive environments such as food, chemical, and construction industries.
A4-80 (SUS316): Contains molybdenum, offering strong resistance to chloride ion corrosion, suitable for highly corrosive environments such as marine, shipbuilding, and coastal facilities.
Performance Grade: Marked in A-X format, e.g., A2-70 indicates a tensile strength of 700 MPa and a yield ratio of 0.7.
3. Alloy Steel
Features: Significantly improves strength, heat resistance, and creep resistance through the addition of alloying elements such as chromium, molybdenum, and vanadium.
Applications: Used in high-temperature and high-pressure environments, such as petroleum refining, power boilers, pressure vessels, and aerospace.
