Anchor Bolt Material Analysis: Performance Differences and Application Adaptability

Metallic materials are the traditional main body of anchor bolts. Among them, carbon steel is commonly used for static fixing in general industrial and civil buildings due to its low cost and moderate strength. However, carbon steel has weak corrosion resistance and is prone to rusting in humid or corrosive environments, requiring surface treatments such as hot-dip galvanizing and epoxy coating to improve its protective capabilities. Stainless steel, on the other hand, uses elements such as chromium and nickel to form a passivation film, significantly improving its corrosion resistance. It is particularly suitable for high-humidity, high-salt, or acidic/alkaline environments such as marine engineering and chemical equipment. Common grades include 304 and 316 stainless steel. The latter, due to the addition of molybdenum, has superior resistance to pitting corrosion and can withstand more severe chemical corrosion. High-strength alloy steel, through heat treatment processes to enhance its yield strength and tensile strength, can withstand large-tonnage static or dynamic impact loads. It is commonly used in applications with extremely high load-bearing requirements, such as bridge bearing fixing and heavy machinery installation.

Non-metallic composite material anchors have seen increasing application in recent years, represented by glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). These materials are lightweight, high-strength, have good insulation, are non-magnetic, and exhibit significantly better resistance to acid and alkali corrosion than metals, making them particularly suitable for fixing applications in electromagnetically sensitive or highly corrosive environments, such as subway tunnels and substations. However, their elastic modulus is lower than that of metals, requiring careful selection in scenarios where deformation control is crucial. Furthermore, their high-temperature resistance is relatively limited, necessitating long-term stability assessment under high-temperature conditions.

Material selection requires comprehensive consideration of load characteristics, environmental conditions, and economic efficiency. For example, ordinary galvanized carbon steel can be used for static fixing in dry indoor environments; stainless steel or composite materials are preferred in coastal or chemical industrial areas; and high-strength alloy steel is required for heavy-load nodes in large-span structures. With advancements in materials technology, the research and development of new composite materials that combine high strength, corrosion resistance, and lightweight properties continues to advance. In the future, this will further expand the application boundaries of anchors in complex engineering scenarios and provide richer solutions for structural safety.