High Strength Flange Bolt

High Strength Flange Bolt is mainly manufactured from carbon steel and alloy steel, while stainless steel is selected for special environments. Different materials determine the basic mechanical properties and service characteristics of High Strength Flange Bolt.

1.Carbon structural steel: 45# steel is widely used with high cost performance and stable mechanical properties, which is a common raw material for High Strength Flange Bolt under normal load conditions.

2.Alloy structural steel: Main grades include 40Cr, 35CrMo and 42CrMo. Featuring excellent hardenability, strength and toughness, they are the core materials for high-grade High Strength Flange Bolt, capable of bearing heavy loads and impact loads.

3.Stainless steel: 304 and 316 are commonly used. They have outstanding rust and corrosion resistance but slightly lower overall strength than carbon steel, and are applied to High Strength Flange Bolt used in corrosive environments.

Clear strength grades are defined for High Strength Flange Bolt in the industry. The higher the grade number, the stronger the tensile and shear resistance of High Strength Flange Bolt.

1.Grade 8.8: A common basic grade with balanced overall performance and the widest application range. It is the mainstream specification of High Strength Flange Bolt for conventional equipment assembly.

2.Grade 10.9: A medium-to-high grade with greatly improved strength and fastening performance. It is suitable for medium and heavy load working conditions and widely adopted for High Strength Flange Bolt in construction machinery.

3.Grade 12.9: The highest grade for civil industrial use with strong ultimate bearing capacity. It is mainly used for High Strength Flange Bolt in harsh working conditions such as heavy machinery and pressure equipment.

Application Scenarios With the advantages of anti-loosening flange face, large bearing area and high strength, High Strength Flange Bolt is widely used in various industrial fields. The requirements for grade and material of High Strength Flange Bolt vary in different scenarios.

1.Automobile manufacturing: Applied to the connection of chassis, frame and body accessories with high requirements for stability and vibration resistance. High Strength Flange Bolt is indispensable for automobile assembly.

2.Construction machinery: Used for structural connection of excavators, loaders, cranes and other equipment. High-grade High Strength Flange Bolt is preferred under heavy load and alternating load conditions.

3.Electromechanical equipment: Applied to the assembly of general machine tools, electrical equipment and transmission parts. Grade 8.8 High Strength Flange Bolt can meet the demands under conventional working conditions.

4.Construction and steel structure: Used for fixing steel structure workshops, brackets and pipelines. Anti-corrosion treated High Strength Flange Bolt is required for outdoor exposure environments.

5.Marine and chemical equipment: For humid, acid and alkali corrosive environments, stainless steel High Strength Flange Bolt is the first choice.

Surface Treatments & Selection Rules

To extend service life and adapt to working conditions, matching surface treatment processes shall be selected for High Strength Flange Bolt according to service environments. Different treatments directly affect the anti-corrosion, anti-rust and appearance performance of High Strength Flange Bolt.

1.Black oxide finish: Low cost with slight anti-rust performance. Suitable for indoor dry and sealed environments without corrosion, mostly used for High Strength Flange Bolt inside machine tools.

2.Electro-galvanizing: A basic anti-corrosion process with medium anti-rust effect. It is applicable to High Strength Flange Bolt for indoor conventional equipment and general machinery assembly, and not recommended for outdoor humid environments.

3.Hot-dip galvanizing: Excellent anti-corrosion and weather resistance with long-lasting waterproof and anti-rust effect. It is the preferred treatment for High Strength Flange Bolt matched with outdoor steel structures and open-air equipment.

4.Dacromet / Zinc-aluminum coating: Outstanding performance in anti-corrosion, erosion resistance and high temperature resistance. Suitable for High Strength Flange Bolt used on automobile chassis, high-temperature working conditions and moderately corrosive environments.

5.Natural stainless steel finish: No extra coating required with inherent anti-corrosion property. Directly used for High Strength Flange Bolt in highly corrosive environments such as chemical and marine fields.