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High Temperature Bolts
QS Fastener: High Temperature Bolts
Name: High Temperature Bolts
Parts: Bolt complete with 2 Heavy Hex Nuts
Material: ASTM A453 GR.660 A
Size: M27
Length: 190mm
Type: Full Thread Stud
Thread: ISO 261
Application: Design for Construction of Nuclear Power Plants
Parts: Bolt complete with 2 Heavy Hex Nuts
Material: ASTM A453 GR.660 A
Size: M27
Length: 190mm
Type: Full Thread Stud
Thread: ISO 261
Application: Design for Construction of Nuclear Power Plants
Quantity
High Temperature Bolts Manufactured from ASTM A453 GR.660 A Special Alloy Steel, with specifications of M27×190mm fully threaded studs paired with two heavy hex nuts, are specifically designed for high-temperature and high-pressure environments in nuclear power plants. These High Temperature Bolts undergo rigorous comprehensive testing during manufacturing to ensure exceptional high-temperature strength, corrosion resistance, and long-term service reliability.
1. 100% Hardness Testing (HRC 28-35)
Testing Purpose:
For High Temperature Bolts, hardness serves as a critical indicator of aging strengthening effects, directly impacting tensile strength, yield strength, and wear resistance. The hardness range of ASTM A453 GR.660 A High Temperature Bolts must be strictly controlled between HRC 28-35 to guarantee mechanical performance stability under high-temperature operating conditions.
Testing Purpose:
For High Temperature Bolts, hardness serves as a critical indicator of aging strengthening effects, directly impacting tensile strength, yield strength, and wear resistance. The hardness range of ASTM A453 GR.660 A High Temperature Bolts must be strictly controlled between HRC 28-35 to guarantee mechanical performance stability under high-temperature operating conditions.
Testing Method:
- Equipment: Rockwell hardness tester (Scale C), 150kgf load, diamond indenter.
- Sampling: Each High Temperature Bolts must be tested at minimum 3 locations (head, shank, thread root).
- Standard Reference: ASTM E18"Standard Test Methods for Rockwell Hardness of Metallic Materials".
- Equipment: Rockwell hardness tester (Scale C), 150kgf load, diamond indenter.
- Sampling: Each High Temperature Bolts must be tested at minimum 3 locations (head, shank, thread root).
- Standard Reference: ASTM E18"Standard Test Methods for Rockwell Hardness of Metallic Materials".
Non-conformance Handling:
If High Temperature Bolts hardness falls outside specified range (HRC <28 or >35), heat treatment process must be reviewed and re-processing performed.
If High Temperature Bolts hardness falls outside specified range (HRC <28 or >35), heat treatment process must be reviewed and re-processing performed.
2. Liquid Penetrant Testing (PT)
Testing Purpose:
To detect surface and near-surface micro-defects (cracks, folds, etc.) in High Temperature Bolts, preventing early failure due to stress concentration.
Testing Purpose:
To detect surface and near-surface micro-defects (cracks, folds, etc.) in High Temperature Bolts, preventing early failure due to stress concentration.
Testing Procedure:
1. Pre-treatment: Clean High Temperature Bolts surface from oil contamination, sandblasting (Ra≤6.3μm).
2. Penetration: Apply red fluorescent penetrant (Type I), dwell time ≥10 minutes.
3. Development: Spray white developer, defects on High Temperature Bolts will show red indications.
4. Evaluation: Per ASTM E165 standard, cracks or linear defects (>1.5mm length) shall be rejected.
1. Pre-treatment: Clean High Temperature Bolts surface from oil contamination, sandblasting (Ra≤6.3μm).
2. Penetration: Apply red fluorescent penetrant (Type I), dwell time ≥10 minutes.
3. Development: Spray white developer, defects on High Temperature Bolts will show red indications.
4. Evaluation: Per ASTM E165 standard, cracks or linear defects (>1.5mm length) shall be rejected.
Sensitivity:
Capable of detecting defects ≥0.5μm wide on High Temperature Bolts.
Capable of detecting defects ≥0.5μm wide on High Temperature Bolts.
3. Intergranular Corrosion Test (ASTM A262 Practice E)
Testing Purpose:
To evaluate whether High Temperature Bolts experience chromium depletion at grain boundaries after sensitization, leading to intergranular corrosion risks.
Testing Purpose:
To evaluate whether High Temperature Bolts experience chromium depletion at grain boundaries after sensitization, leading to intergranular corrosion risks.
Testing Method:
1. Sample preparation: Cut specimens from same batch High Temperature Bolts material (20×30×5mm).
2. Sensitization: 650°C holding for 1 hour to simulate service conditions.
3. Corrosion test: Immerse in boiling copper sulfate-16% sulfuric acid solution for 24 hours.
4. Evaluation: Bend test (180°) for crack inspection, metallographic examination of corrosion depth (allowable ≤50μm).
1. Sample preparation: Cut specimens from same batch High Temperature Bolts material (20×30×5mm).
2. Sensitization: 650°C holding for 1 hour to simulate service conditions.
3. Corrosion test: Immerse in boiling copper sulfate-16% sulfuric acid solution for 24 hours.
4. Evaluation: Bend test (180°) for crack inspection, metallographic examination of corrosion depth (allowable ≤50μm).
Non-conformance Handling:
If grain boundary cracking occurs in High Temperature Bolts specimens, solution treatment process must be adjusted.
If grain boundary cracking occurs in High Temperature Bolts specimens, solution treatment process must be adjusted.
Test Data Recording
All High Temperature Bolts test results are recorded in MES system, including:
- Hardness distribution curves
- PT defect mapping
- Intergranular corrosion micrographs
All High Temperature Bolts test results are recorded in MES system, including:
- Hardness distribution curves
- PT defect mapping
- Intergranular corrosion micrographs
Conclusion:
Through this comprehensive testing process, ASTM A453 GR.660 A High Temperature Bolts can ensure zero-defect delivery for extreme environments like nuclear power plants, with lifecycle failure probability <0.01%.
Through this comprehensive testing process, ASTM A453 GR.660 A High Temperature Bolts can ensure zero-defect delivery for extreme environments like nuclear power plants, with lifecycle failure probability <0.01%.
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