Carbon steel or stainless steel for chemical anchors? Here comes the answer!
Chemical anchors are a new type of anchoring material composed of chemical agents, metal rods, nuts, and washers. The reinforcement principle is to fix the screw in the drilled hole of the concrete substrate through an adhesive, achieving anchorage of the fixing part. According to the material, screws are generally divided into carbon steel and stainless steel.
I. Different compositional elements
Carbon steel is steel with a certain proportion of carbon elements added to iron. Its advantage is that the hardness can be adjusted by heat treatment as needed, but it is prone to rust when exposed to a humid environment for a long time.
Stainless steel is steel with a certain proportion of elements such as chromium, manganese, nickel, and molybdenum added to iron. Its advantage is that the material is not easy to rust under normal circumstances, has good resistance to low temperatures, acids and alkalis, aging, and heat, and is non-creeping at room temperature, with stable long-term load in a humid environment. However, its hardness can only be annealed and not quenched by heat treatment, and the adjustable range is narrow.
II. Different costs
In terms of cost, carbon steel anchors are relatively more economical than stainless steel anchors, which are more expensive. However, compared to stainless steel anchors, carbon steel is more prone to rust.
III. Different coatings
Carbon steel screws are generally divided into cold galvanized screws and hot-dip galvanized screws. In terms of appearance color, cold galvanized screws are bright, while hot-dip galvanized chemical anchors have a deeper, dark gray color. The material grade of carbon steel chemical anchors includes grades 5.8, 8.8, and even 10.9 galvanized, with higher galvanizing grades indicating better quality. The commonly used materials are generally grade 5.8 cold galvanized or grade 8.8 hot-dip galvanized.
The material of stainless steel chemical anchors is divided into 304 stainless steel and 316 stainless steel. 304 stainless steel is a very common type of steel, widely used as a material with iron as the main element and a carbon content generally below 2%, containing other elements. 316 stainless steel chemical anchors, due to the addition of molybdenum, have particularly good corrosion resistance, atmospheric corrosion resistance, and high-temperature strength, and can be used under harsh conditions; they have good work hardening properties.
In summary, both stainless steel and carbon steel chemical anchors have their advantages and disadvantages. In practical situations, the choice should be made according to the needs of the site. The national standard models of Shibang chemical anchors include: M8×110, M10×130, M12×160, M16×190, M20×260, M24×300, M30×380, and other models are complete, and non-standard models can also be customized according to demand. Shibang chemical anchors are widely used in fixing the keel angle code of the curtain wall, steel structure, heavy load fixing, machinery, conveyor belt system, storage system, anti-collision guardrail, sound insulation wall, and positioning anchoring of steel plates during steel bonding reinforcement. Small anchors, big role, in the future, Shibang chemical anchors will be used more and more widely.