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Full Thread B7 Stud Bolt
QS Fastener: Full Thread B7 Stud Bolt
Name: Full Thread B7 Stud Bolt
Standard: ASME
Material: A193 B7
Size: 3-1/2 Inch
Total Length: 750 mm
Surface Treatment: Black
Brand: Qishine
Standard: ASME
Material: A193 B7
Size: 3-1/2 Inch
Total Length: 750 mm
Surface Treatment: Black
Brand: Qishine
Quantity
Full Thread B7 Stud Bolt is a high-strength fastener made from A193 B7 material, compliant with ASME standards, and boasts exceptional tensile strength and high-temperature durability. It measures 3-1/2 inches in size, with a total length of 750 mm. The full-thread design ensures uniform stress distribution and superior fastening performance. The surface is treated with blackening to enhance corrosion resistance. Crafted with precision by the Qishine brand, it offers reliable quality and outstanding performance. It is suitable for high-temperature and high-pressure applications, such as petrochemical, energy equipment, and heavy machinery industries. Full Thread B7 Stud Bolt delivers exceptional performance, providing a solid guarantee for your critical applications!
High-Temperature Resistance of Full Thread B7 Stud Bolt
1. Temperature Range: -29°C to 427°C
Low-Temperature Performance:
At -29°C, Full Thread B7 Stud Bolt maintains excellent toughness and ductility, with no significant risk of brittle fracture.
1. Temperature Range: -29°C to 427°C
Low-Temperature Performance:
At -29°C, Full Thread B7 Stud Bolt maintains excellent toughness and ductility, with no significant risk of brittle fracture.
The impact toughness (Charpy V-notch test) at -29°C typically exceeds 27 J, meeting the requirements for low-temperature applications.
High-Temperature Performance:
At 427°C, the mechanical properties of Full Thread B7 Stud Bolt (such as tensile strength and yield strength) remain stable, with no noticeable softening or deformation.
At 427°C, the mechanical properties of Full Thread B7 Stud Bolt (such as tensile strength and yield strength) remain stable, with no noticeable softening or deformation.
According to ASTM A193 standards, Full Thread B7 Stud Bolt meets international requirements for fracture toughness and ductility within the range of -29°C to 427°C.
2. High-Temperature Strength: Minimum Tensile Strength of 620 MPa at 427°C
Comparison with Room-Temperature Strength:
At room temperature (20°C), the minimum tensile strength of Full Thread B7 Stud Bolt is 860 MPa, and the yield strength is 725 MPa.
Comparison with Room-Temperature Strength:
At room temperature (20°C), the minimum tensile strength of Full Thread B7 Stud Bolt is 860 MPa, and the yield strength is 725 MPa.
High-Temperature Strength Retention:
At 427°C, the tensile strength of Full Thread B7 Stud Bolt remains at 620 MPa, approximately 72% of its room-temperature strength.
At 427°C, the tensile strength of Full Thread B7 Stud Bolt remains at 620 MPa, approximately 72% of its room-temperature strength.
The yield strength at 427°C is about 540 MPa, with a retention rate of approximately 74%.
According to ASME Boiler and Pressure Vessel Code, Full Thread B7 Stud Bolt significantly outperforms ordinary carbon steel (e.g., A307 bolts, which retain only about 50% of their strength at high temperatures).
3. Applications: Steam Pipelines, Boilers, Heat Exchangers, and Other High-Temperature Equipment
Steam Pipelines:
In steam environments with temperatures ranging from 350°C to 400°C, Full Thread B7 Stud Bolt ensures long-term stable operation without significant strength loss or creep deformation.
Steam Pipelines:
In steam environments with temperatures ranging from 350°C to 400°C, Full Thread B7 Stud Bolt ensures long-term stable operation without significant strength loss or creep deformation.
Boilers:
Used in high-temperature and high-pressure connections in boilers, Full Thread B7 Stud Bolt meets long-term strength requirements at 427°C.
Used in high-temperature and high-pressure connections in boilers, Full Thread B7 Stud Bolt meets long-term strength requirements at 427°C.
Heat Exchangers:
Under the influence of high-temperature media (such as hot oil or steam), Full Thread B7 Stud Bolt resists both thermal stress and corrosion.
Under the influence of high-temperature media (such as hot oil or steam), Full Thread B7 Stud Bolt resists both thermal stress and corrosion.
According to API 6A (Petroleum and Natural Gas Industry Standards), the service life of Full Thread B7 Stud Bolt in high-temperature environments can exceed 10 years, far surpassing ordinary steel bolts.
4. Creep Strength and Oxidation Resistance at High Temperatures
Creep Strength:
Creep Strength:
At 427°C, the creep limit (100,000-hour rupture stress) of Full Thread B7 Stud Bolt is approximately 200 MPa, significantly higher than that of ordinary carbon steel (e.g., A307 bolts, with a creep limit of only 100 MPa).
Oxidation Resistance:
In high-temperature environments, the oxidation layer on the surface of Full Thread B7 Stud Bolt forms at a low rate. For example, at 427°C in air, the annual oxidation weight gain of Full Thread B7 Stud Bolt is less than 0.1 mg/cm².
In high-temperature environments, the oxidation layer on the surface of Full Thread B7 Stud Bolt forms at a low rate. For example, at 427°C in air, the annual oxidation weight gain of Full Thread B7 Stud Bolt is less than 0.1 mg/cm².
According to ISO 6934 standards, the long-term stability and oxidation resistance of Full Thread B7 Stud Bolt at high temperatures meet international advanced levels.
5. Experimental Data and Case Studies
Experimental Data:
At 427°C, after 1,000 hours of high-temperature exposure testing, the tensile strength of Full Thread B7 Stud Bolt decreased by only about 5%, demonstrating excellent high-temperature stability.
Experimental Data:
At 427°C, after 1,000 hours of high-temperature exposure testing, the tensile strength of Full Thread B7 Stud Bolt decreased by only about 5%, demonstrating excellent high-temperature stability.
Case Study:
In a power plant's boiler system, Full Thread B7 Stud Bolt was used to connect high-temperature pipelines. After 5 years of operation, no significant creep deformation or oxidation corrosion was observed, significantly extending the service life.
In a power plant's boiler system, Full Thread B7 Stud Bolt was used to connect high-temperature pipelines. After 5 years of operation, no significant creep deformation or oxidation corrosion was observed, significantly extending the service life.
With its exceptional high-temperature performance and corrosion resistance, Full Thread B7 Stud Bolt is an ideal choice for industries such as petrochemical, energy equipment, and heavy machinery. Whether in low or high-temperature environments, Full Thread B7 Stud Bolt provides reliable fastening solutions, ensuring long-term stable operation of equipment.
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