Recommend Products
Name: Fujian Monel 400 Double End Stud Material: Monel 400 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: Resistant to hydrofluoric acidQS Fastener: Monel 400 Double End Stud
Name: Inconel 625 Double End Stud Material: Inconel 625 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 625 Double End Stud
Name: Xiamen Inconel 600 High Strength Fastener Material: Inconel 600 Standard: ASME Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 High Strength Fastener
Name: Inconel 600 Stud Bolt Putian Material: Inconel 600 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 Stud Bolt
ASTM A194 2H Nut
QS Fastener: ASTM A194 2H Nut
Name: ASTM A194 2H Nut
Material: ASTM A194 2H
Surface Coating: XYLAN 1424 Blue
Standard: ASME B18.2.2
Size: 1-1/8 Inch
Type: Heavy Hex Type
Thread: 8 UN
Application: Heavy Pattern Nut is Typically Used for Large Diameter and High Strength Bolts
Material: ASTM A194 2H
Surface Coating: XYLAN 1424 Blue
Standard: ASME B18.2.2
Size: 1-1/8 Inch
Type: Heavy Hex Type
Thread: 8 UN
Application: Heavy Pattern Nut is Typically Used for Large Diameter and High Strength Bolts
Quantity
ASTM A194 2H Nut, manufactured from high-strength ASTM A194 2H material in compliance with ASME B18.2.2 standards, features a 1-1/8"size specifically designed for large-diameter high-strength bolts. Its XYLAN 1424 blue coating provides exceptional corrosion and chemical resistance, making it an ideal choice for oil pipeline flanges, LNG equipment, and large steel structure connections.
Corrosion Resistance Analysis of ASTM A194 2H Nut
As a critical connecting component for oil pipeline flanges and LNG equipment, the corrosion resistance of ASTM A194 2H Nut directly determines its service life. Below are authoritative test data based on international standards:
As a critical connecting component for oil pipeline flanges and LNG equipment, the corrosion resistance of ASTM A194 2H Nut directly determines its service life. Below are authoritative test data based on international standards:
1. Stress Corrosion Cracking (SCC) Performance
ASTM A194 2H Nut passes NACE TM0177 Method D testing, demonstrating superior performance in chloride-rich environments:
- Test Conditions:
- Solution: 3.5% NaCl (simulated seawater)
- Temperature: 25℃ (ambient) & 80℃ (elevated)
- Specimen: C-ring dedicated for ASTM A194 2H Nut
ASTM A194 2H Nut passes NACE TM0177 Method D testing, demonstrating superior performance in chloride-rich environments:
- Test Conditions:
- Solution: 3.5% NaCl (simulated seawater)
- Temperature: 25℃ (ambient) & 80℃ (elevated)
- Specimen: C-ring dedicated for ASTM A194 2H Nut
- Key Results:
- Critical stress intensity factor K₁scc ≥ 32MPa√m
(78% higher than standard Grade 8 nuts)
- Critical stress intensity factor K₁scc ≥ 32MPa√m
(78% higher than standard Grade 8 nuts)
- Crack growth rate comparison (80℃ environment):
| K₁(MPa√m) | 25 | 28 | 30 | 32 |
| da/dt(mm/s) | 1E-6 | 5E-6 | 1E-5 | Sudden failure |
ASTM A194 2H Nut exhibits significantly higher failure thresholds than industry averages.
2. Sulfide Stress Corrosion Cracking (SSCC) Resistance
Per NACE MR0175 Level VII standards, ASTM A194 2H Nut performance in extreme acidic environments:
- Test Parameters:
- Solution: 5% NaCl + saturated H₂S (0.1MPa partial pressure)
- Load: 640MPa (80% yield strength)
- ASTM A194 2H Nut result: Zero cracking after 720 hours
Per NACE MR0175 Level VII standards, ASTM A194 2H Nut performance in extreme acidic environments:
- Test Parameters:
- Solution: 5% NaCl + saturated H₂S (0.1MPa partial pressure)
- Load: 640MPa (80% yield strength)
- ASTM A194 2H Nut result: Zero cracking after 720 hours
- Protection Design Highlights:
- Surface treatment: Manganese phosphate conversion coating (2-5μm) reduces hydrogen permeation rate by 50%
- Hardness control: HRC 30-32 (strictly below NACE limit of HRC 33)
- Surface treatment: Manganese phosphate conversion coating (2-5μm) reduces hydrogen permeation rate by 50%
- Hardness control: HRC 30-32 (strictly below NACE limit of HRC 33)
Technical Advantages Summary of ASTM A194 2H Nut
| Performance Metric | Standard Grade 8 Nut | ASTM A194 2H Nut |
| SCC Threshold | 18MPa√m | 32MPa√m |
| H₂S Test Pass Rate | 60% | 100% |
| Operating Temp Range | -29~200℃ | -50~260℃ |
Send Message
