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ASTM A193 B7 Stud Bolt
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Name: ASTM A193 B7 Stud Bolt
Material: ASTM A193 B7
Standard: ASME B18.31.2
Coating: XYLAN Blue
Size: 1 Inch
Thread: 8 UN
Type: Fully Thread Bolt with Chamfer
Application: For Seaside Equipment Connection
Material: ASTM A193 B7
Standard: ASME B18.31.2
Coating: XYLAN Blue
Size: 1 Inch
Thread: 8 UN
Type: Fully Thread Bolt with Chamfer
Application: For Seaside Equipment Connection
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ASTM A193 B7 Stud Bolt is a fastener specifically engineered for harsh coastal environments, manufactured from ASTM A193 B7 chromium-molybdenum alloy steel with XYLAN blue coating, delivering exceptional salt spray corrosion resistance to extend offshore facility service life.
Mechanical Performance Analysis of ASTM A193 B7 Stud Bolt
ASTM A193 B7 Stud Bolt utilizes chromium-molybdenum alloy steel (AISI 4140/4142), undergoes quenching and tempering heat treatment, achieving outstanding high strength, toughness, and high-temperature resistance. Its mechanical properties comply with ASTM A193 standards, making it the preferred fastener for high-temperature and high-pressure applications.
ASTM A193 B7 Stud Bolt utilizes chromium-molybdenum alloy steel (AISI 4140/4142), undergoes quenching and tempering heat treatment, achieving outstanding high strength, toughness, and high-temperature resistance. Its mechanical properties comply with ASTM A193 standards, making it the preferred fastener for high-temperature and high-pressure applications.
1. Tensile & Yield Strength
- ASTM A193 B7 Stud Bolt Requirements:
- Tensile strength (Rm) ≥ 860 MPa (125 ksi)
- Yield strength (Rp0.2) ≥ 725 MPa (105 ksi)
- ASTM A193 B7 Stud Bolt Requirements:
- Tensile strength (Rm) ≥ 860 MPa (125 ksi)
- Yield strength (Rp0.2) ≥ 725 MPa (105 ksi)
- Typical Test Results:
- ASTM A193 B7 Stud Bolt tensile strength typically reaches 900–1100 MPa (depending on heat treatment).
- Yield strength ranges 750–950 MPa.
- ASTM A193 B7 Stud Bolt tensile strength typically reaches 900–1100 MPa (depending on heat treatment).
- Yield strength ranges 750–950 MPa.
- Engineering Advantages:
- Compared to mild carbon steel (e.g., ASTM A307), ASTM A193 B7 Stud Bolt offers 2× higher tensile strength, ideal for high-preload flange connections.
- Maintains >70% yield strength at 450°C (vs. ~50% for carbon steel).
- Compared to mild carbon steel (e.g., ASTM A307), ASTM A193 B7 Stud Bolt offers 2× higher tensile strength, ideal for high-preload flange connections.
- Maintains >70% yield strength at 450°C (vs. ~50% for carbon steel).
2. Elongation & Reduction of Area (Ductility Metrics)
- ASTM A193 B7 Stud Bolt Requirements:
- Elongation (A) ≥ 16% (4D gauge length)
- Reduction of area (Z) ≥ 50%
- ASTM A193 B7 Stud Bolt Requirements:
- Elongation (A) ≥ 16% (4D gauge length)
- Reduction of area (Z) ≥ 50%
- Performance Data:
- ASTM A193 B7 Stud Bolt typically achieves 18–22% elongation and 55–65% reduction of area.
- ASTM A193 B7 Stud Bolt typically achieves 18–22% elongation and 55–65% reduction of area.
- Application Value:
- High ductility prevents brittle fracture in impact/vibration environments (e.g., offshore platforms).
- High ductility prevents brittle fracture in impact/vibration environments (e.g., offshore platforms).
3. Hardness (HRC) Control
- ASTM A193 B7 Stud Bolt Range: 22–32 HRC
- Critical Process:
- Optimized via 540–700°C tempering (25–30 HRC) to balance strength and toughness.
- If HRC >32, ASTM A193 B7 Stud Bolt may face hydrogen embrittlement risks (electroplating restrictions required).
- ASTM A193 B7 Stud Bolt Range: 22–32 HRC
- Critical Process:
- Optimized via 540–700°C tempering (25–30 HRC) to balance strength and toughness.
- If HRC >32, ASTM A193 B7 Stud Bolt may face hydrogen embrittlement risks (electroplating restrictions required).
4. Impact Toughness (Low-Temperature Performance)
- ASTM A193 B7 Stud Bolt Requirements:
- Charpy V-notch impact test (-29°C) ≥ 27 J
- Arctic/LNG applications may require ≥ 54 J (special heat treatment).
- ASTM A193 B7 Stud Bolt Requirements:
- Charpy V-notch impact test (-29°C) ≥ 27 J
- Arctic/LNG applications may require ≥ 54 J (special heat treatment).
- Case Study:
- ASTM A193 B7 Stud Bolt for offshore platforms or cryogenic valves must pass -46°C impact tests for reliability.
- ASTM A193 B7 Stud Bolt for offshore platforms or cryogenic valves must pass -46°C impact tests for reliability.
5. Fatigue Performance (Dynamic Load Suitability)
- ASTM A193 B7 Stud Bolt Fatigue Limit: 400–450 MPa (10⁷ cycles)
- Optimization Methods:
- Rolled threads improve fatigue life by 20–30%.
- Shot peening reduces stress concentration.
- ASTM A193 B7 Stud Bolt Fatigue Limit: 400–450 MPa (10⁷ cycles)
- Optimization Methods:
- Rolled threads improve fatigue life by 20–30%.
- Shot peening reduces stress concentration.
Key Advantages of ASTM A193 B7 Stud Bolt
1. High Strength (Tensile ≥860 MPa) – Meets high-pressure flange preload demands.
2. High Toughness (Elongation ≥16%) – Resists vibration in marine environments.
3. High-Temperature Stability – Outperforms carbon steel at 450°C.
1. High Strength (Tensile ≥860 MPa) – Meets high-pressure flange preload demands.
2. High Toughness (Elongation ≥16%) – Resists vibration in marine environments.
3. High-Temperature Stability – Outperforms carbon steel at 450°C.
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