ASTM A453 Grade 660 Studs Bolts Heavy Hex Nuts
Comprehensive Guide on
ASTM A453 Grade 660 Class A, B, C & D Fasteners
Introduction
Aanuraj Fasteners Pvt Ltd is a leading manufacturer of high-quality fasteners, known for its exceptional craftsmanship and technical excellence. One of our standout products is the ASTM A453 Grade 660 fasteners, including studs, bolts, and heavy hex nuts. These fasteners are renowned for their superior strength and durability, making them ideal for high-temperature and high-pressure applications.
Overview of ASTM A453 Grade 660 Fasteners
ASTM A453 Grade 660 is a specification that covers heat-resistant bolting materials for use in high-temperature service. This specification is categorized into four classes (A, B, C, and D), each offering unique mechanical properties to cater to various industrial needs.
Technical Specifications
| Property | Class A | Class B | Class C | Class D |
|---|---|---|---|---|
| Yield Strength (MPa) | 515 | 585 | 650 | 725 |
| Tensile Strength (MPa) | 725 | 760 | 795 | 860 |
| Elongation (%) | 18 | 18 | 18 | 18 |
| Reduction of Area (%) | 50 | 50 | 50 | 50 |
| Stress Rupture | Excellent | Excellent | Excellent | Excellent |
General Specifications
| Standard | Details |
|---|---|
| ASTM A 453 GR.660 | CLASS: A, B, C & D |
| MOC | UNS 66286 / ALLOY A286 |
| DIMENSIONS | ASME B18.2.1, ASME B18.3 |
| THREADS INCHES | ASME B1.1 2A/3A UNIFIED THREADS |
| THREADS METRICS | B1.13M 6H COARSE THREADS |
| ADDITIONAL REQUIREMENTS | NACE MR0103 / MR0175 / ISO 15156 COMPLIANCE |
| MANDATORY REQUIREMENTS | FREE FROM MERCURY & RADIOACTIVE CONTAMINATION |
Chemical Analysis
| Chemical Element | Minimum % | Maximum % |
|---|---|---|
| Carbon (C) | – | 0.08 |
| Manganese (Mn) | – | 2.00 |
| Phosphorus (P) | – | 0.040 |
| Sulfur (S) | – | 0.030 |
| Silicon (Si) | – | 1.000 |
| Nickel (Ni) | 24.00 | 27.00 |
| Chromium (Cr) | 13.5 | 16.00 |
| Molybdenum (Mo) | 1.00 | 1.50 |
| Titanium (Ti) | 1.90 | 2.35 |
| Aluminum (Al) | – | 0.35 |
| Vanadium (V) | 0.10 | 0.50 |
| Boron (B) | 0.001 | 0.010 |
Mechanical Properties
| Property | Grade 660 (Class A, B, C) | Grade 660 (Class D) |
|---|---|---|
| Tensile Strength | 130 KSI / 895 MPA | 130 KSI / 895 MPA |
| Yield Strength | 85 KSI / 585 MPA | 105 KSI / 725 MPA |
| Elongation % | 15% (Minimum) | 15% (Minimum) |
| Reduction of Area % | 18% (Minimum) | 18% (Minimum) |
| Brinell Hardness | 248-341 | 248-341 |
| Rockwell Hardness | 24-37 HRC | 24-35 HRC |
Importance of Stress Rupture Test
The stress rupture test is a critical evaluation method used to determine the long-term strength and durability of materials under high temperature and stress conditions. This test is essential for ASTM A453 Grade 660 fasteners, as it ensures they can withstand the rigors of high-temperature service without failure.
Key Benefits:
Ensures Reliability: Confirms that the fasteners can endure prolonged stress at elevated temperatures.
Enhances Safety: Reduces the risk of catastrophic failures in critical applications.
Verifies Quality: Assures that the material meets stringent quality standards.
Case Study: Application of ASTM A453 Grade 660 Fasteners in a Power Plant
Background:
A major power plant was experiencing frequent failures of their standard fasteners in their high-pressure steam turbine. The operating conditions involved temperatures exceeding 600°C and pressures around 100 bar, necessitating a more robust solution.
Solution:
Aanuraj Fasteners Pvt Ltd proposed the use of ASTM A453 Grade 660 Class D fasteners, known for their exceptional strength and resistance to high temperatures and pressures.
Implementation:
Material Selection: ASTM A453 Grade 660 Class D was chosen for its superior mechanical properties.
Manufacturing: Custom-sized studs, bolts, and heavy hex nuts were manufactured to fit the specific requirements of the turbine.
Installation: The fasteners were installed during a scheduled maintenance shutdown.
Results:
Improved Reliability: The new fasteners significantly reduced the failure rate, leading to improved reliability of the steam turbine.
Cost Savings: Reduced downtime and maintenance costs resulted in substantial financial savings for the power plant.
Enhanced Performance: The turbine operated more efficiently, withstanding the high temperatures and pressures without any issues.
Manufacturing Excellence at Aanuraj Fasteners Pvt Ltd
At Aanuraj Fasteners Pvt Ltd, we pride ourselves on being a leader in the manufacturing of high-performance fasteners in India. Our state-of-the-art manufacturing facilities and rigorous quality control processes ensure that every fastener we produce meets the highest standards of quality and reliability.
Key Features:
Advanced Technology: Utilization of cutting-edge machinery and technology for precision manufacturing.
Quality Assurance: Comprehensive testing and inspection procedures to guarantee product integrity.
Custom Solutions: Ability to produce bespoke fasteners tailored to specific client requirements.
Conclusion:
ASTM A453 Grade 660 fasteners are essential for high-temperature and high-pressure applications across various industries. With Aanuraj Fasteners Pvt Ltd, you can be assured of receiving top-quality, reliable, and durable fasteners that meet your specific needs. Our commitment to excellence and customer satisfaction makes us a preferred choice for clients seeking the best in fastener solutions.
For more information on our products and services, visit Aanuraj Fasteners Pvt Ltd.
