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Heavy-Duty 2H Nut
QS Fastener: Heavy-Duty 2H Nut
Name: Heavy-Duty 2H Nut
Type: Heavy Hex
Top Layer: Teflon 1070 Blue
Material: ASTM A194 2H
Standard: API 20E BSL-3
Size: 1-1/4 Inch
Thread: 8 UNC
Marking: API monogram
Feature: With Double Anti-corrosion Coating
First Layer: Zinc Nickel
Type: Heavy Hex
Top Layer: Teflon 1070 Blue
Material: ASTM A194 2H
Standard: API 20E BSL-3
Size: 1-1/4 Inch
Thread: 8 UNC
Marking: API monogram
Feature: With Double Anti-corrosion Coating
First Layer: Zinc Nickel
Quantity
ASTM A194 Heavy-Duty 2H Nut — A heavy hex nut compliant with API 20E BSL-3 standards, specifically engineered for extreme operating conditions. This 2H Nut features dual-layer anti-corrosion coating technology (zinc-nickel alloy base + Teflon 1070 blue topcoat), delivering exceptional corrosion resistance for high-pressure applications in marine, chemical, and energy sectors. With 1-1/4"8 UNC coarse threading, it ensures high preload and secure fastening, backed by API certification (bearing API monogram).
Manufacturing Process & Technical Parameters
1. Raw Material Refinement & Selection
- Heavy-Duty 2H Nut Material Standard: Strictly adheres to ASTM A194 2H specifications, using premium chromium-molybdenum alloy steel.
- Composition Optimization:
- Carbon (C) ≤ 0.38% for balanced 2H Nut toughness and strength.
- Chromium (Cr) 0.80–1.10% for enhanced high-temperature oxidation resistance.
- Molybdenum (Mo) 0.15–0.25% to improve hydrogen embrittlement and stress corrosion resistance.
- Quality Control: Each 2H Nut raw material batch undergoes OES spectroscopy and mechanical property testing.
1. Raw Material Refinement & Selection
- Heavy-Duty 2H Nut Material Standard: Strictly adheres to ASTM A194 2H specifications, using premium chromium-molybdenum alloy steel.
- Composition Optimization:
- Carbon (C) ≤ 0.38% for balanced 2H Nut toughness and strength.
- Chromium (Cr) 0.80–1.10% for enhanced high-temperature oxidation resistance.
- Molybdenum (Mo) 0.15–0.25% to improve hydrogen embrittlement and stress corrosion resistance.
- Quality Control: Each 2H Nut raw material batch undergoes OES spectroscopy and mechanical property testing.
2. Precision Forging & Forming
- Heavy-Duty 2H Nut Cold Heading: Multi-station cold forging ensures continuous metal fiber flow, increasing fatigue resistance by 15% vs. machined alternatives.
- Dimensional Control: Hex width tolerance ±0.15mm (ISO 4759-1); thread accuracy per ASME B1.1 8 UNC standard.
- Heavy-Duty 2H Nut Cold Heading: Multi-station cold forging ensures continuous metal fiber flow, increasing fatigue resistance by 15% vs. machined alternatives.
- Dimensional Control: Hex width tolerance ±0.15mm (ISO 4759-1); thread accuracy per ASME B1.1 8 UNC standard.
3. Heat Treatment Strengthening
- Heavy-Duty 2H Nut Quenching Process: Oil quenching at 850–880°C achieves uniform martensitic microstructure.
- Tempering: Low-temperature tempering at 550–650°C stabilizes hardness at HRC 22–30.
- Inspection:
- 100% hardness testing (Rockwell scale).
- Ultrasonic testing (UT) guarantees defect-free 2H Nuts.
- Heavy-Duty 2H Nut Quenching Process: Oil quenching at 850–880°C achieves uniform martensitic microstructure.
- Tempering: Low-temperature tempering at 550–650°C stabilizes hardness at HRC 22–30.
- Inspection:
- 100% hardness testing (Rockwell scale).
- Ultrasonic testing (UT) guarantees defect-free 2H Nuts.
4. Surface Treatment & Corrosion Protection
- Heavy-Duty 2H Nut Base Protection: Zinc-nickel electroplating (8–12μm), salt spray resistance >1,000 hours (ASTM B117).
- Enhanced Coating: Optional blue PTFE layer, resistant to acids/alkalis (pH 1–14).
- Special Applications: Dacromet coating available for marine-grade 2H Nuts.
- Heavy-Duty 2H Nut Base Protection: Zinc-nickel electroplating (8–12μm), salt spray resistance >1,000 hours (ASTM B117).
- Enhanced Coating: Optional blue PTFE layer, resistant to acids/alkalis (pH 1–14).
- Special Applications: Dacromet coating available for marine-grade 2H Nuts.
Key Features & Advantages of Heavy-Duty 2H Nut
1. Superior Mechanical Performance
- Ultra-high strength: Tensile strength ≥ 860 MPa, yield strength ≥ 720 MPa.
- Anti-fatigue design: Optimized thread root radius extends 2H Nut service life by 30% (ASTM E466).
1. Superior Mechanical Performance
- Ultra-high strength: Tensile strength ≥ 860 MPa, yield strength ≥ 720 MPa.
- Anti-fatigue design: Optimized thread root radius extends 2H Nut service life by 30% (ASTM E466).
2. Extreme Environment Adaptability
- Thermal stability: -50°C impact toughness ≥ 27 J; retains 80% strength at +450°C.
- Corrosion resistance: Dual-layer coating passes NACE TM0177 sulfide stress cracking tests.
- Thermal stability: -50°C impact toughness ≥ 27 J; retains 80% strength at +450°C.
- Corrosion resistance: Dual-layer coating passes NACE TM0177 sulfide stress cracking tests.
3. Safety & Reliability
- Full-process certification: API 20E BSL-3 qualification, with SGS/BV third-party inspection support.
- Vibration resistance: >90% preload retention under dynamic loads.
- Full-process certification: API 20E BSL-3 qualification, with SGS/BV third-party inspection support.
- Vibration resistance: >90% preload retention under dynamic loads.
Typical Applications
1. Energy & Petrochemical
- Oil drilling: API 6A wellhead assemblies with 2H Nut resisting H₂S stress corrosion.
- LNG equipment: Cryogenic storage tanks (-196°C) with 2H Nut compatibility.
1. Energy & Petrochemical
- Oil drilling: API 6A wellhead assemblies with 2H Nut resisting H₂S stress corrosion.
- LNG equipment: Cryogenic storage tanks (-196°C) with 2H Nut compatibility.
2. Power & Heavy Machinery
- Nuclear plants: ASME III-certified 2H Nuts for reactor pressure vessel flanges.
- Wind turbines: EN 14399 HV preload standards to withstand wind-induced loosening.
- Nuclear plants: ASME III-certified 2H Nuts for reactor pressure vessel flanges.
- Wind turbines: EN 14399 HV preload standards to withstand wind-induced loosening.
3. Infrastructure & Bridges
- Offshore bridges: C5-M corrosion-protected 2H Nuts for cable anchorage systems.
- High-pressure pipelines: ASME B16.5 Class 2500 flange connections, zero-leakage sealing.
- Offshore bridges: C5-M corrosion-protected 2H Nuts for cable anchorage systems.
- High-pressure pipelines: ASME B16.5 Class 2500 flange connections, zero-leakage sealing.
Value-Added Services
- Custom Heavy-Duty 2H Nut Solutions: Non-standard sizing and B7M low-carbon martensitic steel upgrades available.
- Custom Heavy-Duty 2H Nut Solutions: Non-standard sizing and B7M low-carbon martensitic steel upgrades available.
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