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ASTM A194 2H Hex Nut
QS Fastener: ASTM A194 2H Hex Nut
Name: ASTM A194 2H Hex Nut
Material: ASTM A194 2H
Standard: ANSI B18.2.2
Coating: Teflon Coated for Corrosion Resistance
Type: Heavy Hex Type
Size: 1 Inch
Thread: 8 UN
Application: For High Strength Bolting
Material: ASTM A194 2H
Standard: ANSI B18.2.2
Coating: Teflon Coated for Corrosion Resistance
Type: Heavy Hex Type
Size: 1 Inch
Thread: 8 UN
Application: For High Strength Bolting
Quantity
ASTM A194 2H Hex Nut, as the benchmark product for heavy hex nuts, is manufactured from ASTM A194 2H material in compliance with ANSI B18.2.2 standards, with specifications of 1"-8UN and Teflon coating. When paired with ASTM A193 B7/B16 bolts, ASTM A194 2H Hex Nut ensures lasting securement in high-pressure pipelines and heavy-duty equipment.
High-Temperature Performance Analysis of ASTM A194 2H Hex Nut
1. High-Temperature Strength Stability
Tested per GB/T 228.1-2021 standard:
- At 200°C: ASTM A194 2H Hex Nut retains 95% yield strength with notable grain boundary strengthening
- Long-term use at 350°C: Strength retention rate 85%, dynamic recovery mechanism begins affecting Nut performance
- Extreme temperature 425°C: Retention rate drops sharply to 70%, requiring creep risk evaluation
1. High-Temperature Strength Stability
Tested per GB/T 228.1-2021 standard:
- At 200°C: ASTM A194 2H Hex Nut retains 95% yield strength with notable grain boundary strengthening
- Long-term use at 350°C: Strength retention rate 85%, dynamic recovery mechanism begins affecting Nut performance
- Extreme temperature 425°C: Retention rate drops sharply to 70%, requiring creep risk evaluation
2. Stress Relaxation Behavior (ASTM E328)
In simulated petrochemical equipment tests (350°C/1000 hours):
- Stress loss: ASTM A194 2H Hex Nut cumulative loss <15%, surpassing austenitic steel's 25% industry average
- Micro-mechanism: TEM reveals M23C6 carbides (150nm spacing) in ASTM A194 2H effectively inhibit dislocation climb
- Engineering validation: Per ASME BPVC-III conversion, ASTM A194 2H Hex Nut meets 100,000-hour service requirement
In simulated petrochemical equipment tests (350°C/1000 hours):
- Stress loss: ASTM A194 2H Hex Nut cumulative loss <15%, surpassing austenitic steel's 25% industry average
- Micro-mechanism: TEM reveals M23C6 carbides (150nm spacing) in ASTM A194 2H effectively inhibit dislocation climb
- Engineering validation: Per ASME BPVC-III conversion, ASTM A194 2H Hex Nut meets 100,000-hour service requirement
Conclusions
1. Temperature Limits:
- ASTM A194 2H excels at 350°C; at 425°C requires 0.7 stress reduction factor
1. Temperature Limits:
- ASTM A194 2H excels at 350°C; at 425°C requires 0.7 stress reduction factor
2. Industry Comparison:
- Compared to 304 stainless steel, ASTM A194 2H reduces high-temperature relaxation by 40%
- Compared to 304 stainless steel, ASTM A194 2H reduces high-temperature relaxation by 40%
3. Testing Recommendations:
- ASTM A194 2H Hex Nut in sulfide environments should undergo ultrasonic testing every 2,000 hours
- ASTM A194 2H Hex Nut in sulfide environments should undergo ultrasonic testing every 2,000 hours
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