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Black Coated B7 Stud Bolt
QS Fastener: Black Coated B7 Stud Bolt
Name: Black Coated B7 Stud Bolt
Standard: ASTM
Material: SA193 B7
Size : 3-1/2 Inch
Length: 750 mm
Thread: 8UN
Brand: Qishine
Surface Finished: Black
Standard: ASTM
Material: SA193 B7
Size : 3-1/2 Inch
Length: 750 mm
Thread: 8UN
Brand: Qishine
Surface Finished: Black
Quantity
The Black Coated B7 Stud Bolt is a high-strength and durable fastener! Made from SA193 B7 material and compliant with ASTM standards, it offers excellent tensile strength and high-temperature resistance, making it suitable for demanding industrial environments. With a size of 3-1/2 inches, a length of 750 mm, and 8UN threading, its surface is treated with a black coating to enhance corrosion resistance. Crafted with precision by the Qishine brand, its quality is trustworthy. The Black Coated B7 Stud Bolt is widely used in industries such as petrochemicals, power equipment, and heavy machinery, making it a reliable choice for your critical applications. The Black Coated B7 Stud Bolt, with its exceptional performance, provides a solid guarantee for your projects!
Corrosion Resistance of the Black Coated B7 Stud Bolt
The Black Coated B7 Stud Bolt performs well in terms of corrosion resistance and is widely used in industrial environments requiring high corrosion resistance. Its unique alloy composition and heat treatment process make it excel in corrosive environments.
The Black Coated B7 Stud Bolt performs well in terms of corrosion resistance and is widely used in industrial environments requiring high corrosion resistance. Its unique alloy composition and heat treatment process make it excel in corrosive environments.
1. Material Characteristics
The main alloying elements of the Black Coated B7 Stud Bolt are chromium (Cr) and molybdenum (Mo), which significantly enhance its corrosion resistance:
Chromium (Cr): Typically present in a range of 0.8% to 1.1%. Chromium forms a dense chromium oxide (Cr₂O₃) protective layer on the steel surface, effectively preventing further corrosion from corrosive media.
The main alloying elements of the Black Coated B7 Stud Bolt are chromium (Cr) and molybdenum (Mo), which significantly enhance its corrosion resistance:
Chromium (Cr): Typically present in a range of 0.8% to 1.1%. Chromium forms a dense chromium oxide (Cr₂O₃) protective layer on the steel surface, effectively preventing further corrosion from corrosive media.
Molybdenum (Mo): Present in a range of approximately 0.15% to 0.25%. Molybdenum enhances the steel's resistance to pitting and crevice corrosion, especially in environments containing chloride ions.
Additionally, the Black Coated B7 Stud Bolt undergoes quenching and tempering heat treatment, providing high strength (tensile strength ≥860 MPa, yield strength ≥730 MPa) and good toughness, enabling it to work stably in high-stress and corrosive environments over the long term.
2. Corrosion Resistance Capability
The Black Coated B7 Stud Bolt demonstrates excellent corrosion resistance in various corrosive environments, with a corrosion rate significantly lower than that of ordinary carbon steel. Below are specific data points:
Salt Spray Environment: In a 3.5% NaCl solution, the annual corrosion rate of the Black Coated B7 Stud Bolt is less than 0.1 mm/year, while ordinary carbon steel typically has an annual corrosion rate of over 0.5 mm/year.
The Black Coated B7 Stud Bolt demonstrates excellent corrosion resistance in various corrosive environments, with a corrosion rate significantly lower than that of ordinary carbon steel. Below are specific data points:
Salt Spray Environment: In a 3.5% NaCl solution, the annual corrosion rate of the Black Coated B7 Stud Bolt is less than 0.1 mm/year, while ordinary carbon steel typically has an annual corrosion rate of over 0.5 mm/year.
Weak Acid and Alkali Environments: In media with a pH of 5-9, the corrosion rate of the Black Coated B7 Stud Bolt is extremely low, with experimental data showing an annual corrosion rate of less than 0.05 mm/year.
High-Temperature and High-Pressure Environments: Under conditions of temperature ≤400°C and pressure ≤10 MPa, the corrosion resistance of the Black Coated B7 Stud Bolt remains stable, with no significant increase in corrosion rate.
3. Service Life
Due to its low corrosion rate in corrosive environments, the service life of the Black Coated B7 Stud Bolt is significantly extended.
Due to its low corrosion rate in corrosive environments, the service life of the Black Coated B7 Stud Bolt is significantly extended.
For example:
In offshore platforms, the service life of the Black Coated B7 Stud Bolt can exceed 20 years, while ordinary carbon steel bolts typically last no more than 5 years.
In offshore platforms, the service life of the Black Coated B7 Stud Bolt can exceed 20 years, while ordinary carbon steel bolts typically last no more than 5 years.
In chemical equipment, the service life of the Black Coated B7 Stud Bolt is 10-15 years, depending on the corrosiveness of the medium and operating conditions.
The Black Coated B7 Stud Bolt is a reliable solution for applications in corrosive and demanding environments. Its alloy composition, heat treatment, and black coating make it an ideal choice for industries such as petrochemicals, power, and heavy machinery. With its low corrosion rate and extended service life, the Black Coated B7 Stud Bolt ensures optimal performance and safe operation in your most critical applications.
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