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1 Inch Nut Sa 194 Gr 2H
QS Fastener: 1 Inch Nut Sa 194 Gr 2H
Product: 1 Inch Nut Sa 194 Gr 2H
Size: 1 Inch
Type: Heavy Hex
Material: Sa 194 Gr 2H
Standard: API 20E
Grade: BSL1
Thread: 8 UNC
Surface Treatment: Zinc Coating
Size: 1 Inch
Type: Heavy Hex
Material: Sa 194 Gr 2H
Standard: API 20E
Grade: BSL1
Thread: 8 UNC
Surface Treatment: Zinc Coating
Quantity
1 Inch Nut Sa 194 Gr 2H
Manufactured from SA194 Gr2H material, compliant with API 20E standard, BSL1 certified, featuring 8 UNC threads and zinc-plated anti-corrosion coating. Designed for demanding applications such as oil pipelines and high-pressure valves, this nut combines high strength and corrosion resistance, making it a reliable choice for industrial fastening.
Manufactured from SA194 Gr2H material, compliant with API 20E standard, BSL1 certified, featuring 8 UNC threads and zinc-plated anti-corrosion coating. Designed for demanding applications such as oil pipelines and high-pressure valves, this nut combines high strength and corrosion resistance, making it a reliable choice for industrial fastening.
Heat Treatment Process and Performance Optimization of 1 Inch Nut Sa 194 Gr 2H
Heat treatment is a critical process in the manufacturing of 1 Inch Nut Sa 194 Gr 2H, directly influencing its mechanical properties, high-temperature resistance, and fatigue performance. This nut undergoes quenching and tempering (Q&T) heat treatment to meet the stringent requirements of ASTM A194 for high strength, toughness, and thermal stability.
Heat treatment is a critical process in the manufacturing of 1 Inch Nut Sa 194 Gr 2H, directly influencing its mechanical properties, high-temperature resistance, and fatigue performance. This nut undergoes quenching and tempering (Q&T) heat treatment to meet the stringent requirements of ASTM A194 for high strength, toughness, and thermal stability.
1. Quenching Process
Quenching rapidly cools 1 Inch Nut Sa 194 Gr 2H to form a hard martensitic structure, enhancing its strength.
Quenching rapidly cools 1 Inch Nut Sa 194 Gr 2H to form a hard martensitic structure, enhancing its strength.
1.1 Heating Stage
- Temperature range: 850–880°C (1 Inch Nut Sa 194 Gr 2H typically controlled at 860°C ±10°C).
- Soaking time: 1–2 hours (ensuring complete austenitization of the core).
- Heating equipment: Controlled atmosphere furnace or continuous mesh belt furnace recommended to prevent surface decarburization.
- Temperature range: 850–880°C (1 Inch Nut Sa 194 Gr 2H typically controlled at 860°C ±10°C).
- Soaking time: 1–2 hours (ensuring complete austenitization of the core).
- Heating equipment: Controlled atmosphere furnace or continuous mesh belt furnace recommended to prevent surface decarburization.
1.2 Cooling Method
- Quenching medium: Fast-quenching oil (ISO 32 or 46) to balance cooling rate and deformation risk.
- Cooling duration: Oil-quenched to below 200°C, then air-cooled (suitable for large-sized 1 Inch Nut Sa 194 Gr 2H).
- Quenching medium: Fast-quenching oil (ISO 32 or 46) to balance cooling rate and deformation risk.
- Cooling duration: Oil-quenched to below 200°C, then air-cooled (suitable for large-sized 1 Inch Nut Sa 194 Gr 2H).
1.3 Post-Quenching Microstructure & Properties
- Microstructure: Lath martensite, hardness HRC 45–55 (requires tempering adjustment).
- Residual stress: Rapid cooling induces stress concentration, mitigated by tempering.
- Microstructure: Lath martensite, hardness HRC 45–55 (requires tempering adjustment).
- Residual stress: Rapid cooling induces stress concentration, mitigated by tempering.
2. Tempering Process
Tempering reduces brittleness in 1 Inch Nut Sa 194 Gr 2H, optimizing strength-toughness balance.
Tempering reduces brittleness in 1 Inch Nut Sa 194 Gr 2H, optimizing strength-toughness balance.
2.1 Tempering Temperature Selection
- 550–600°C: For high-pressure flange applications, hardness HRC 28–32.
- 600–650°C: For dynamic/vibration loads, hardness HRC 22–26.
- 550–600°C: For high-pressure flange applications, hardness HRC 28–32.
- 600–650°C: For dynamic/vibration loads, hardness HRC 22–26.
2.2 Soaking & Cooling
- Soaking time: 2–4 hours (ensuring uniform microstructure transformation).
- Cooling method: Air-cooled (to avoid temper embrittlement).
- Soaking time: 2–4 hours (ensuring uniform microstructure transformation).
- Cooling method: Air-cooled (to avoid temper embrittlement).
2.3 Post-Tempering Properties
- Tensile strength: ≥830 MPa (per ASTM A194).
- Elongation: ≥15%, ensuring ductility in 1 Inch Nut Sa 194 Gr 2H.
- Tensile strength: ≥830 MPa (per ASTM A194).
- Elongation: ≥15%, ensuring ductility in 1 Inch Nut Sa 194 Gr 2H.
3. Quality Control in Heat Treatment
1 Inch Nut Sa 194 Gr 2H must pass:
1) Hardness testing (HRC 22–34).
2) Metallographic analysis (martensite transformation verification).
3) Low-temperature impact test (toughness validation at -30°C).
1 Inch Nut Sa 194 Gr 2H must pass:
1) Hardness testing (HRC 22–34).
2) Metallographic analysis (martensite transformation verification).
3) Low-temperature impact test (toughness validation at -30°C).
4. Common Defects & Solutions
| Defect Type | Root Cause | Solution (for 1 Inch Nut Sa 194 Gr 2H) |
| Quenching cracks | Excessive cooling rate or uneven temperature | Optimize quenching oil speed; use stepped heating |
| Insufficient tempering | Low temperature or short duration | Strictly monitor furnace temp; extend soaking time |
| Surface decarburization | Inadequate protective atmosphere | Use controlled atmosphere/vacuum furnace |
5. Conclusion
Precision quenching and tempering enable 1 Inch Nut Sa 194 Gr 2H to achieve high strength (≥830 MPa), superior toughness, and thermal stability, making it ideal for extreme conditions (e.g., oil/gas, chemical industries). Process control and rigorous testing ensure reliability.
Precision quenching and tempering enable 1 Inch Nut Sa 194 Gr 2H to achieve high strength (≥830 MPa), superior toughness, and thermal stability, making it ideal for extreme conditions (e.g., oil/gas, chemical industries). Process control and rigorous testing ensure reliability.
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