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M36 Nut Material A194
QS Fastener: M36 Nut Material A194
Name: M36 Nut Material A194
Dimension: M36
Type: Heavy Hex Type
Standard: ISO 4033
Material: ASTM A194 7
Coating: Zinc and Bichromated
Technical : According to ASTM A370 Impact Test at -101℃ Value ≥27J
Dimension: M36
Type: Heavy Hex Type
Standard: ISO 4033
Material: ASTM A194 7
Coating: Zinc and Bichromated
Technical : According to ASTM A370 Impact Test at -101℃ Value ≥27J
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M36 Nut Material A194 - Heavy Hex Nut Technical Specifications
This ISO 4033-compliant heavy hex nut, manufactured from ASTM A194 Grade 7 high-strength alloy steel with zinc-chromate coating, delivers exceptional corrosion resistance and mechanical strength. Its key advantage lies in passing -101°C low-temperature impact testing (≥27J), ensuring superior anti-fracture performance in cryogenic environments, making it ideal for demanding applications in petroleum, chemical, LNG, and low-pressure vessel industries.
This ISO 4033-compliant heavy hex nut, manufactured from ASTM A194 Grade 7 high-strength alloy steel with zinc-chromate coating, delivers exceptional corrosion resistance and mechanical strength. Its key advantage lies in passing -101°C low-temperature impact testing (≥27J), ensuring superior anti-fracture performance in cryogenic environments, making it ideal for demanding applications in petroleum, chemical, LNG, and low-pressure vessel industries.
The long-term reliability of ASTM A194 Grade 7 nuts in extreme conditions depends not only on alloy composition and heat treatment but equally on surface coating technology. Proper surface treatment enhances corrosion resistance, stabilizes friction coefficients, and optimizes assembly performance.
1. Zinc-Chromate Coating (Dacromet) Solution for Material A194 M36 Nut
Process Compatibility:
For M36 Nut Material A194's large-size characteristics, Dacromet forms a uniform protective layer through dip-coating and 300°C curing, eliminating the"edge effect"of traditional electroplating.
Process Compatibility:
For M36 Nut Material A194's large-size characteristics, Dacromet forms a uniform protective layer through dip-coating and 300°C curing, eliminating the"edge effect"of traditional electroplating.
Key Advantages:
- Enhanced Corrosion Resistance:
- M36 Nut Material A194 withstands 500-hour salt spray testing (ASTM B117) without red rust, ideal for offshore platform flange connections.
- Hydrogen embrittlement-free properties perfectly match A194 Grade 7's high hardness requirements (HRC 32-39).
- Enhanced Corrosion Resistance:
- M36 Nut Material A194 withstands 500-hour salt spray testing (ASTM B117) without red rust, ideal for offshore platform flange connections.
- Hydrogen embrittlement-free properties perfectly match A194 Grade 7's high hardness requirements (HRC 32-39).
- Temperature Adaptability:
- In LNG pipelines, M36 Nut Material A194's Dacromet coating maintains integrity across -196°C to 250°C thermal cycles.
- In LNG pipelines, M36 Nut Material A194's Dacromet coating maintains integrity across -196°C to 250°C thermal cycles.
2. Hot-Dip Galvanizing (HDG) Solution for M36 Nut Material A194
Critical Process Controls:
- Centrifugal zinc-spinning required for M36 Nut Material A194's large threads to control coating thickness (recommended 40±5μm).
- Mandatory 200°C×4h dehydrogenation post-treatment to eliminate hydrogen embrittlement risks in A194 Grade 7 material.
Critical Process Controls:
- Centrifugal zinc-spinning required for M36 Nut Material A194's large threads to control coating thickness (recommended 40±5μm).
- Mandatory 200°C×4h dehydrogenation post-treatment to eliminate hydrogen embrittlement risks in A194 Grade 7 material.
Performance Comparison:
- In bridge structures, HDG-treated M36 Nut Material A194 reduces costs by 30% vs. Dacromet but requires periodic sealant reapplication.
- Wear testing shows Nut's HDG coating maintains 80% coverage after 10 disassembly cycles (ISO 1461).
- In bridge structures, HDG-treated M36 Nut Material A194 reduces costs by 30% vs. Dacromet but requires periodic sealant reapplication.
- Wear testing shows Nut's HDG coating maintains 80% coverage after 10 disassembly cycles (ISO 1461).
3. Phosphating Treatment Solution for M36 Nut Material A194
Precision Assembly Applications:
- When used in wind turbine main shafts, manganese phosphating stabilizes M36 Nut Material A194's torque coefficient (K=0.15±0.02).
- Phosphated M36 Nut Material A194 shows 40% lower vibration-induced torque decay versus standard nuts (DIN 65151).
Precision Assembly Applications:
- When used in wind turbine main shafts, manganese phosphating stabilizes M36 Nut Material A194's torque coefficient (K=0.15±0.02).
- Phosphated M36 Nut Material A194 shows 40% lower vibration-induced torque decay versus standard nuts (DIN 65151).
4. M36 Nut Material A194 Surface Treatment Comparison
| Parameter | Dacromet | Hot-Dip Galvanizing | Phosphating |
| Optimal Size Range | M24-M64 | M16-M48 | M10-M36 |
| Compatibility | Optimal (full-thread coverage) | Good (requires centrifugal process) | Moderate (rust prevention only) |
5. Engineering Selection Guidelines for M36 Nut Material A194
- Cryogenic Applications: Prioritize Dacromet-treated (e.g., LNG tank anchoring systems).
- Severe Corrosion Environments: Recommend with Dacromet+silane sealing composite treatment (15-year service life).
- Dynamic Loading Conditions: Use phosphated with hydraulic tensioners (±5% preload accuracy).
- Cryogenic Applications: Prioritize Dacromet-treated (e.g., LNG tank anchoring systems).
- Severe Corrosion Environments: Recommend with Dacromet+silane sealing composite treatment (15-year service life).
- Dynamic Loading Conditions: Use phosphated with hydraulic tensioners (±5% preload accuracy).
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