Minimum Order : 250
Customization as per requiments
| Size Range | 5 mm to 600 mm diameter |
| Length | 3-200mm |
| Standards | Astm, Asme, Din, Nf, Jis, En, Ios |
| Finished | Black, Bright, Cold Drawn, Polish, Polished, Centreless Ground |
Neptune Alloys is an ASTM A453 Grade 660 Class D Round Bar Manufacturer providing premium high-temperature alloy bars known for their exceptional strength and creep resistance. These round bars are part of the A453 Grade 660 family—an iron-nickel-chromium alloy engineered for use in environments involving extreme heat and stress. Class D specifically delivers the highest tensile strength among the grade variants, making it suitable for critical fasteners and components in gas turbines, nuclear plants, petrochemical units, and high-pressure bolting applications. Manufactured in compliance with ASTM A453 and ASME specifications, these bars ensure dimensional precision and metallurgical reliability. We also specialize in Molybdenum Round Bar, known for its exceptional resistance to seawater and aggressive chemical environments.
As a trusted B2B material choice, ASTM A453 Grade 660 Class D Round Bars offer guaranteed thermal stability, proven mechanical strength, and essential reliability in mission-critical applications. With custom machining options, surface finishes, and size configurations, they support quick integration into complex systems. These bars are bulk-ready and meet update 2025 standards, making them a must know resource for EPC contractors, OEMs, and industries requiring best-in-class materials for high-temperature, high-pressure performance.
Hot rolled ASTM A453 Grade 660 Class D round bars are produced at high temperatures, resulting in improved formability and strength for heavy duty applications. These bars are well suited for use in turbine components, high temperature bolts, and flange connections where reliable performance under thermal stress is essential.
Cold drawn round bars offer enhanced surface finish and greater dimensional precision. The cold working process increases the tensile strength and hardness, making these bars ideal for high pressure bolting, valve stems, and precision machined parts in energy and aerospace industries.
What is ASTM A453 Grade 660 Class D Round Bar used for?
ASTM A453 Grade 660 Class D Round Bar is primarily used in high-temperature and high-pressure environments, such as gas turbines, nuclear reactors, and pressure vessels. It is especially suited for bolting applications due to its excellent mechanical strength and creep resistance.
What are the key properties of ASTM A453 Grade 660 Class D Round Bar?
This round bar offers high tensile strength, superior stress rupture properties, and excellent oxidation resistance. It performs reliably at elevated temperatures up to 704°C (1300°F), making it ideal for critical structural components.
What materials make up ASTM A453 Grade 660 Class D Round Bar?
ASTM A453 Grade 660 Class D is an iron-nickel-chromium alloy with additions of molybdenum and titanium. Its composition ensures durability, heat resistance, and long-term performance in extreme service conditions.
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