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ASME A193 B7 Hex Bolt
QS Fastener: ASME A193 B7 Hex Bolt
Name: ASME A193 B7 Hex Bolt
Standard: ASME
Material: A193 B7
Surface Finishing: Color-Zinc Coated
Size: M6 to M100
Length: 30 to 1000 mm
Thread: 4-1/2 UNC
Grade: A
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Standard: ASME
Material: A193 B7
Surface Finishing: Color-Zinc Coated
Size: M6 to M100
Length: 30 to 1000 mm
Thread: 4-1/2 UNC
Grade: A
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Quantity
The ASME A193 B7 Hex Bolt is manufactured from high-strength A193 B7 alloy steel, offering excellent tensile strength and corrosion resistance. The surface is treated with a colored zinc coating, and it is available in diameters ranging from M6 to M100 and lengths from 30 to 1000 mm. Suitable for applications in oil pipelines, mechanical equipment, the chemical industry, and construction engineering, it is a reliable choice for high-strength fastening connections.
Performance of the ASME A193 B7 Hex Bolt in High-Temperature and Corrosive Environments
The ASME A193 B7 Hex Bolt is made from chromium-molybdenum alloy steel (Cr-Mo), whose chemical composition and heat treatment processes enable it to perform exceptionally well in high-temperature and corrosive environments.
The ASME A193 B7 Hex Bolt is made from chromium-molybdenum alloy steel (Cr-Mo), whose chemical composition and heat treatment processes enable it to perform exceptionally well in high-temperature and corrosive environments.
Resistance to Hydrogen Sulfide (H₂S) Stress Corrosion Cracking (SSC)
In acidic environments containing hydrogen sulfide (H₂S), metal materials are prone to stress corrosion cracking (SSC), a brittle fracture phenomenon caused by the combined effects of corrosion and stress. The ASME A193 B7 Hex Bolt exhibits excellent SSC resistance due to the following characteristics:
In acidic environments containing hydrogen sulfide (H₂S), metal materials are prone to stress corrosion cracking (SSC), a brittle fracture phenomenon caused by the combined effects of corrosion and stress. The ASME A193 B7 Hex Bolt exhibits excellent SSC resistance due to the following characteristics:
Material Composition
Chromium (Cr) content: 0.80%-1.10%. Chromium forms a dense oxide layer (Cr₂O₃) on the steel surface, significantly enhancing the material's corrosion resistance.
Molybdenum (Mo) content: 0.15%-0.25%. Molybdenum improves the material's resistance to pitting and stress corrosion cracking, particularly in H₂S-containing environments.
Chromium (Cr) content: 0.80%-1.10%. Chromium forms a dense oxide layer (Cr₂O₃) on the steel surface, significantly enhancing the material's corrosion resistance.
Molybdenum (Mo) content: 0.15%-0.25%. Molybdenum improves the material's resistance to pitting and stress corrosion cracking, particularly in H₂S-containing environments.
Heat Treatment Process
The ASME A193 B7 Hex Bolt undergoes quenching and tempering processes, ensuring its hardness is within the range of HB 235-302. This hardness range guarantees high strength while effectively reducing the risk of stress corrosion cracking.
The ASME A193 B7 Hex Bolt undergoes quenching and tempering processes, ensuring its hardness is within the range of HB 235-302. This hardness range guarantees high strength while effectively reducing the risk of stress corrosion cracking.
SSC Testing Standards
The ASME A193 B7 Hex Bolt complies with the NACE MR0175/ISO 15156 standard, the authoritative standard for metal materials in the oil and gas industry regarding resistance to stress corrosion cracking in H₂S environments.
The ASME A193 B7 Hex Bolt complies with the NACE MR0175/ISO 15156 standard, the authoritative standard for metal materials in the oil and gas industry regarding resistance to stress corrosion cracking in H₂S environments.
Testing Conditions: Tests are conducted in a simulated acidic environment with a pH of 3.5-4.5 and an H₂S partial pressure of 0.1-1 bar.
Test Results: In the NACE TM0177 standard stress corrosion cracking test, the ASME A193 B7 Hex Bolt remains crack-free for 720 hours under 80% yield strength conditions, demonstrating exceptional SSC resistance.
Test Results: In the NACE TM0177 standard stress corrosion cracking test, the ASME A193 B7 Hex Bolt remains crack-free for 720 hours under 80% yield strength conditions, demonstrating exceptional SSC resistance.
Performance in Other Corrosive Environments
In addition to H₂S-containing environments, the ASME A193 B7 Hex Bolt performs well in other corrosive media:
Carbon Dioxide (CO₂) Corrosion: In high-temperature, high-pressure CO₂ environments, the ASME A193 B7 Hex Bolt exhibits a low corrosion rate, making it suitable for downhole equipment and pipeline connections in oil and gas fields.
In addition to H₂S-containing environments, the ASME A193 B7 Hex Bolt performs well in other corrosive media:
Carbon Dioxide (CO₂) Corrosion: In high-temperature, high-pressure CO₂ environments, the ASME A193 B7 Hex Bolt exhibits a low corrosion rate, making it suitable for downhole equipment and pipeline connections in oil and gas fields.
Chloride Environments: In chloride-containing environments, the ASME A193 B7 Hex Bolt offers high resistance to pitting and crevice corrosion, making it ideal for offshore platforms and coastal industrial equipment.
High-Temperature Oxidation: In environments below 450°C (842°F), the oxide layer formed on the surface of the ASME A193 B7 Hex Bolt effectively prevents further oxidation, extending its service life.
Impact of Surface Treatments on Corrosion Resistance
To enhance the corrosion resistance of the ASME A193 B7 Hex Bolt, the following surface treatment processes are commonly applied:
Phosphating: Forms a phosphate protective layer on the surface, improving corrosion resistance and lubrication.
Galvanizing: Applies a hot-dip or electro-galvanized coating for additional corrosion protection.
Cadmium Plating: In marine environments, cadmium plating significantly improves resistance to salt spray corrosion.
To enhance the corrosion resistance of the ASME A193 B7 Hex Bolt, the following surface treatment processes are commonly applied:
Phosphating: Forms a phosphate protective layer on the surface, improving corrosion resistance and lubrication.
Galvanizing: Applies a hot-dip or electro-galvanized coating for additional corrosion protection.
Cadmium Plating: In marine environments, cadmium plating significantly improves resistance to salt spray corrosion.
Real-World Application Cases
Oil and Gas Field Equipment: In H₂S-containing oil and gas fields, the ASME A193 B7 Hex Bolt is used for wellhead devices, valves, and pipeline connections, ensuring safe operation under harsh conditions.
Oil and Gas Field Equipment: In H₂S-containing oil and gas fields, the ASME A193 B7 Hex Bolt is used for wellhead devices, valves, and pipeline connections, ensuring safe operation under harsh conditions.
Refineries: In high-temperature, high-pressure refining equipment, the ASME A193 B7 Hex Bolt is used for flange connections and reactor fasteners, demonstrating excellent corrosion resistance and reliability.
Offshore Platforms: In marine environments, the ASME A193 B7 Hex Bolt is used for platform structures and equipment connections, effectively resisting salt spray and chloride corrosion.
The ASME A193 B7 Hex Bolt excels in high-temperature and corrosive environments, particularly in acidic conditions containing hydrogen sulfide, where it exhibits superior resistance to stress corrosion cracking. Its material composition, heat treatment processes, and surface treatment technologies work together to meet the demanding requirements of the oil and gas, chemical, and power industries. Whether in laboratory tests or real-world applications, the ASME A193 B7 Hex Bolt has proven its exceptional corrosion resistance and reliability.
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