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1-1/4 Inch Nut A194 2H
QS Fastener: 1-1/4 Inch Nut A194 2H
Product: 1-1/4 Inch Nut A194 2H
Dimension: 1-1/4 Inch
Type: Heavy Hex Nut
Material: A194 2H
Manufacture Standard: API 20E
Surface Treatment: Xylan Coating Red PTFE
Dimension: 1-1/4 Inch
Type: Heavy Hex Nut
Material: A194 2H
Manufacture Standard: API 20E
Surface Treatment: Xylan Coating Red PTFE
Quantity
The 1-1/4 Inch Nut A194 2H is manufactured from high-strength alloy steel A194 2H, compliant with API 20E standards, and specifically designed for high-temperature and high-pressure applications. With its 1-1/4-inch specification, this nut delivers exceptional load-bearing capacity, while the red Xylan PTFE coating provides superior corrosion resistance, chemical resistance, and anti-galling properties. The 1-1/4 Inch Nut A194 2H is an ideal choice for flange connections in petroleum, chemical, and pipeline systems. Its easy installation and extended service life make it perfect for critical fastening applications such as valves and pressure vessels.
Heat Treatment Process (Quenching & Tempering)
The core performance of the 1-1/4 Inch Nut A194 2H relies on quenching and tempering heat treatment, which directly impacts its hardness, tensile strength, toughness, and high-temperature resistance.
The core performance of the 1-1/4 Inch Nut A194 2H relies on quenching and tempering heat treatment, which directly impacts its hardness, tensile strength, toughness, and high-temperature resistance.
1. Quenching Process (Austenitizing & Quenching)
Objective: To achieve a high-strength martensitic microstructure in the 1-1/4 Inch Nut A194 2H.
- Heating Temperature: 850–900°C (880±10°C preferred for Cr-Mo steels).
- Soaking Time: 1.2–2 min/mm (ensures full austenitization of the 1-1/4-inch nut core).
Objective: To achieve a high-strength martensitic microstructure in the 1-1/4 Inch Nut A194 2H.
- Heating Temperature: 850–900°C (880±10°C preferred for Cr-Mo steels).
- Soaking Time: 1.2–2 min/mm (ensures full austenitization of the 1-1/4-inch nut core).
- Cooling Medium:
- Oil Quenching: Suitable for 1-1/4 Inch Nut A194 2H and other small-to-medium-sized nuts (cooling rate: 80–120°C/s).
- Water Quenching + Polymer Solution: Used for larger nuts (>2"), requiring deformation control.
- Oil Quenching: Suitable for 1-1/4 Inch Nut A194 2H and other small-to-medium-sized nuts (cooling rate: 80–120°C/s).
- Water Quenching + Polymer Solution: Used for larger nuts (>2"), requiring deformation control.
- Microstructure: Post-quench hardness ≥50 HRC (lath martensite), requiring immediate tempering.
2. Tempering Process
Objective: To optimize the hardness-toughness balance of the 1-1/4 Inch Nut A194 2H.
- Tempering Temperature: 600–650°C (typically 620°C), target hardness HRC 22–34.
- Holding Time: 2–4 hours (adjusted for 1-1/4-inch nut dimensions).
Objective: To optimize the hardness-toughness balance of the 1-1/4 Inch Nut A194 2H.
- Tempering Temperature: 600–650°C (typically 620°C), target hardness HRC 22–34.
- Holding Time: 2–4 hours (adjusted for 1-1/4-inch nut dimensions).
- Performance Data:
- 600°C Tempering: Tensile strength ≥724 MPa, yield strength ≥586 MPa.
- 650°C Tempering: Elongation ≥16%, impact energy (-29°C) ≥27 J.
- 600°C Tempering: Tensile strength ≥724 MPa, yield strength ≥586 MPa.
- 650°C Tempering: Elongation ≥16%, impact energy (-29°C) ≥27 J.
3. Key Performance Validation (1-1/4 Inch Nut A194 2H)
| Parameter | As-Quenched | Tempered (HRC 25–30) | ASTM A194 2H Requirement |
| Hardness (HRC) | ≥50 | 22–34 | 22–34 |
| Tensile Strength (MPa) | – | 724–895 | ≥724 |
| Elongation (%) | <5 | 14–18 | ≥14 (4D gauge length) |
4. Critical Process Controls
- Temperature Uniformity: Controlled atmosphere furnaces (±5°C) prevent surface decarburization of the 1-1/4 Inch Nut A194 2H.
- Cooling Rate: >30°C/s in martensitic transformation range (monitored via IR thermography).
- Temper Embrittlement Avoidance: Rapid cooling through 400–550°C range (critical for low P/S materials like A193 B7M).
- Temperature Uniformity: Controlled atmosphere furnaces (±5°C) prevent surface decarburization of the 1-1/4 Inch Nut A194 2H.
- Cooling Rate: >30°C/s in martensitic transformation range (monitored via IR thermography).
- Temper Embrittlement Avoidance: Rapid cooling through 400–550°C range (critical for low P/S materials like A193 B7M).
5. Comparison with Other Standards
| Property | 1-1/4 Inch Nut A194 2H | A194 4 (Stainless) | A194 7 (Cryogenic) |
| Heat Treatment | Quench & Temper | Solution Annealing | Cryogenic Treatment |
| Operating Temp. Range | -29–425°C | -196–600°C | -196–200°C |
Conclusion
The 1-1/4 Inch Nut A194 2H achieves an optimal balance of high strength (≥724 MPa) and toughness through precision heat treatment, making it reliable for high-pressure and high-temperature applications. For NADCAP certification or technical support, please contact us.
The 1-1/4 Inch Nut A194 2H achieves an optimal balance of high strength (≥724 MPa) and toughness through precision heat treatment, making it reliable for high-pressure and high-temperature applications. For NADCAP certification or technical support, please contact us.
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