ASTM A193 Hexagon socket bolt

QS Fastener: ASTM A193 Hexagon socket bolt

Name: ASTM A193 Hexagon socket bolt
Standard: ASTM
Material: A193
Size: M6 to M100
Total Length: 30 to 1000 mm
Grade: A
Application: Oil Pipeline, Machinery, Chemical Industry, Building

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The ASTM A193 Hexagon Socket Bolt is manufactured using premium A193 material, complying with ASTM standards, and is available in sizes ranging from M6 to M100, with lengths of 30 to 1000 mm. It is widely used in oil pipelines, machinery, chemical industries, and construction sectors. Its hexagonal socket design facilitates easy installation, offering high torque transmission efficiency and excellent corrosion resistance, making it the preferred choice for reliable connections in demanding environments.

The ASTM A193 standard encompasses various material grades, and below is a detailed introduction to the primary material grades:

1. B7: Chromium-Molybdenum Alloy Steel
B7 material is the most commonly used chromium-molybdenum alloy steel in the ASTM A193 Hexagon Socket Bolt standard, renowned for its exceptional strength and toughness, making it ideal for high-temperature and high-pressure environments. Through heat treatment processes (quenching and tempering), it achieves high strength and excellent fatigue resistance, particularly suitable for bolts and studs in petrochemical, power equipment, and pressure vessel applications.

Chemical Composition:
Carbon (C): 0.37-0.49%
Manganese (Mn): 0.65-1.10%
Chromium (Cr): 0.75-1.20%
Molybdenum (Mo): 0.15-0.25%
The balanced composition of these elements provides B7 material with excellent hardenability and thermal stability.

Mechanical Properties:
Tensile Strength: ≥860 MPa
Yield Strength: ≥725 MPa
Elongation: ≥16%

B7 material maintains high mechanical properties even at elevated temperatures, with a maximum operating temperature of 450°C, making it an ideal choice for the ASTM A193 Hexagon Socket Bolt in high-temperature environments.

2. B8: Austenitic Stainless Steel
B8 material belongs to the austenitic stainless steel series, with common grades including 304 and 304L, 316 and 316L. Its outstanding corrosion and oxidation resistance make it an ideal choice for corrosive environments, widely used in chemical, food processing, and marine engineering industries.

Chemical Composition:
Carbon (C): ≤0.08%
Chromium (Cr): 18.0-20.0%
Nickel (Ni): 8.0-11.0%
The low carbon content and high chromium and nickel levels provide B8 material with excellent corrosion resistance and formability.

Mechanical Properties:
Tensile Strength: ≥515 MPa
Yield Strength: ≥205 MPa
Elongation: ≥40%

B8 material retains good toughness even in low-temperature environments, making it suitable for a wide temperature range and a reliable choice for the ASTM A193 Hexagon Socket Bolt in corrosive environments.

3. B16: Chromium-Molybdenum-Vanadium Alloy Steel
B16 material is an upgraded version of B7 with the addition of vanadium (V), making it suitable for higher temperature and stress conditions. The inclusion of vanadium enhances the material’s strength and creep resistance, particularly ideal for critical equipment in the power industry, such as boilers, steam turbines, and nuclear power plants.

Chemical Composition:
Carbon (C): 0.37-0.49%
Manganese (Mn): 0.65-1.10%
Chromium (Cr): 0.75-1.20%
Molybdenum (Mo): 0.50-0.65%
Vanadium (V): 0.03-0.08%
The grain-refining effect of vanadium significantly improves the material’s strength and toughness.

Mechanical Properties:
Tensile Strength: ≥860 MPa
Yield Strength: ≥725 MPa
Elongation: ≥16%

B16 material can withstand temperatures up to 540°C, making it an ideal choice for the ASTM A193 Hexagon Socket Bolt in high-temperature environments.

4. B8M: Molybdenum-Containing Austenitic Stainless Steel
B8M material is an upgraded version of B8 with the addition of molybdenum (Mo), further enhancing its corrosion resistance, particularly in environments containing chloride ions. Common grades include 316 and 316L, widely used in chemical, marine engineering, and pharmaceutical industries.

Chemical Composition:
Carbon (C): ≤0.08%
Chromium (Cr): 16.0-18.0%
Nickel (Ni): 10.0-14.0%
Molybdenum (Mo): 2.0-3.0%
The addition of molybdenum significantly improves the material’s resistance to pitting and crevice corrosion.

Mechanical Properties:
Tensile Strength: ≥515 MPa
Yield Strength: ≥205 MPa
Elongation: ≥40%
B8M material maintains excellent performance in harsh corrosive environments, extending the service life of the ASTM A193 Hexagon Socket Bolt.

The material grades in the ASTM A193 standard each have unique characteristics, catering to different operational requirements. B7 and B16 materials are renowned for their high strength and high-temperature resistance, making them suitable for high-pressure and high-temperature environments. B8 and B8M materials, with their exceptional corrosion resistance, are the preferred choices for corrosive environments. Selecting the appropriate material grade based on specific application scenarios ensures the reliability and longevity of the ASTM A193 Hexagon Socket Bolt.

With its premium materials and diverse grades, the ASTM A193 Hexagon Socket Bolt is widely used in oil, chemical, machinery, and construction industries. Whether in high-temperature, high-pressure environments or corrosive conditions, it delivers outstanding performance and reliability.

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