ASTM A453 660 Class A Round Bar - ASTM A453 660 Class B Bars

ASTM A453 660 Class A Round Bar - ASTM A453 660 Class B Bars

Name: ASTM A453 660 Class A Round Bar - ASTM A453 660 Class B Bars
Brand: JAYANT IMPEX
Price: 1456.0 INR
Availability: InStock

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Product Details:

Standard ASTM A453/A453M
Length 2 - 6 meters or as required
Application High Temperature, Bolts, Fasteners, Pressure Vessels, Petrochemical & Nuclear applications
Processing Annealed, Solution Treated
Grade 660 Class A, 660 Class B (also Class C & D optional)
Diameter 6mm - 200mm or custom size
Type Round Bar, Rod, Bright Bar
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ASTM A453 660 Class A Round Bar - ASTM A453 660 Class B Bars Price And Quantity

Minimum Order Quantity 1 Kilograms
Price 1456.0 INR/Kilograms

ASTM A453 660 Class A Round Bar - ASTM A453 660 Class B Bars Product Specifications

Processing Annealed, Solution Treated
Type Round Bar, Rod, Bright Bar
Specific Use Studs, Bolting, Fasteners, Shafts
Finish Bright, Black, Polished
Tolerance H9, H11 or as required
Technique Hot Rolled, Cold Drawn
Material ASTM A453 Grade 660 (Alloy 660/Nitronic 50) Stainless Steel
Application High Temperature, Bolts, Fasteners, Pressure Vessels, Petrochemical & Nuclear applications
Standard ASTM A453/A453M
Length 2 - 6 meters or as required
Grade 660 Class A, 660 Class B (also Class C & D optional)
Diameter 6mm - 200mm or custom size

Surface Condition Peeled, Turned, Polished, Ground
Density 7.90 g/cm3
Heat Treatment Solution Annealed (982C - 1010C, water quench)
Elongation 16% Min
Tensile Strength 760 MPa - 930 MPa
End Condition Plain, Threaded, Chamfered
Corrosion Resistance Excellent (especially at elevated temperatures)
Yield Strength 450 MPa Min
Magnetic Properties Non-magnetic in annealed condition
Hardness 223 HB Max
Melting Point 1398 - 1446 C
Impact Value 50 J (Charpy V-notch) at Room Temperature

Product Description

ASTM A453 Grade 660 Class A vs. Class B Round Bars

ASTM A453 Grade 660 is the standard metallurgical specification for high-temperature, high-strength bolting materials and round bar stock. Chemically identical to Alloy A286 (UNS S66286), this iron-base austenitic superalloy is designed for critical fastening components operating at continuous service temperatures up to 704C (1300F).

While Class A and Class B round bars share identical chemical envelopes and room-temperature minimum mechanical property requirements, they diverge completely in their solution annealing heat treatment profile.

The Primary Differentiator: Heat Treatment Profiles

The divergence between Class A and Class B alters the material's microstructural grain architecture before the final precipitation-hardening (aging) bake:

Heat Treatment Parameter	Class A Round Bars	Class B Round Bars
Solution Annealing Temperature	1650F 25F (900C 14C)	1800F 25F (980C 14C)
Minimum Holding Time	2 Hours minimum	1 Hour minimum
Quench Medium	Liquid Quench (Water/Polymer)	Liquid Quench (Water/Polymer)
Precipitation Hardening (Aging)	1325F 25F (720C), hold 16 hours, air cool	1325F 25F (720C), hold 16 hours, air cool
Resulting Grain Structure	Highly refined, finer grain size	Fully recrystallized, coarser grain size

Shared Mechanical Property Requirements

Because both classes undergo the exact same 16-hour aging treatment at 1325F, they must meet the same room-temperature mechanical property baselines required by the ASTM A453 standard:

Ultimate Tensile Strength ( $R_m$ ): $ge$ 130 ksi (895 MPa)
0.2% Yield Strength ( $R_{p0.2}$ ): $ge$ 85 ksi (585 MPa)
Minimum Elongation ( $A_5$ ): $ge$ 15%
Minimum Reduction of Area ( $Z$ ): $ge$ 18%
Hardness Range:248 to 341 HBW (or 24 to 37 HRC)
Stress Rupture Requirement: Both classes must withstand a continuous load of 56 ksi (385 MPa) at 1200F (650C) for a minimum of 100 hours without breaking.

Engineering & Application Implications

The difference in solution temperatures creates distinct structural trade-offs for engineers specifying these round bars:

Class A (Finer Grain)

The lower solution temperature (1650F) leaves some carbides undissolved, which pins the grain boundaries and prevents excessive grain growth.

Advantage: Finer grain sizes yield higher room-temperature fatigue resistance, better localized ductility, and slightly improved low-temperature impact toughness.
Best For: High-cycle dynamic load applications, aerospace engine hardware, and components subjected to frequent cyclic thermal transitions.

Class B (Coarser Grain)

The higher solution temperature (1800F) dissolves more secondary intermetallic phases back into the austenitic solid matrix.

Advantage: A coarser grain structure provides enhanced long-term creep-rupture stability and higher resistance to grain boundary sliding under sustained, dead-weight loads at maximum operating temperatures.
Best For: High-pressure subsea oil and gas equipment, massive turbine casing studs, and flanged pressure vessels requiring strict compliance with NACE MR0175/ISO 15156 sour gas safety margins.

Exceptional Mechanical Performance

ASTM A453 660 Class A and B bars are manufactured to strict tolerance standards (H9, H11 or as required) and deliver reliable performance under demanding conditions. The bars offer high tensile and yield strength, with excellent ductility and impact resistance. Their robust mechanical profile ensures they perform consistently in high-stress environments, such as petrochemical plants and nuclear reactors.

Corrosion and Temperature Resistance

Designed for high-temperature and corrosive settings, these stainless steel bars maintain their integrity and strength even at elevated temperatures, thanks to their unique alloy composition and specialized heat treatment. The solution annealing process imparts superior corrosion resistance, making them ideal for applications where long-term durability in harsh environments is essential.

Flexible Sizing and Surface Finishes

With diameters ranging from 6 mm up to 200 mm and customizable lengths (2 to 6 meters or as needed), these bars are available in various surface and end conditions including peeled, polished, ground, plain, threaded, and chamfered. Their adaptable sizing and finishes ensure suitability for a broad range of fastening and structural uses.

FAQ's of ASTM A453 660 Class A Round Bar - ASTM A453 660 Class B Bars:

Q: How are ASTM A453 660 Class A and B round bars processed and heat treated?

A: These bars undergo solution annealing between 982C and 1010C, followed by rapid water quenching. This process ensures optimal mechanical properties, improves corrosion resistance, and makes the material non-magnetic in the annealed state.

Q: What industrial applications commonly use ASTM A453 660 bars?

A: A453 660 round bars are frequently used in the fabrication of studs, bolts, fasteners, and shafts for high-temperature, high-stress environments. They are particularly favored in pressure vessels, petrochemical processing, and nuclear power plants due to their reliable performance and durability.

Q: What benefits do these bars offer over standard stainless steel bars?

A: ASTM A453 660 bars offer exceptional high-temperature strength, excellent corrosion resistance, and superior impact values. Their performance in critical and corrosive environments exceeds that of standard stainless steels, providing longer service life and reduced maintenance needs.

Q: When should one select Class A over Class B or vice versa?

A: Selection depends on application-specific mechanical requirements. Class A bars are typically used where slightly lower strength but higher ductility is desired, while Class B offers increased tensile strength. The choice should align with the mechanical load and safety factors of your project.

Q: Where can I source ASTM A453 660 bars in India?

A: These bars are available through manufacturers, exporters, suppliers, dealers, and fabricators across India. Many reputable companies provide custom processing, various grades (A, B, C, D), and finish options to meet specific project requirements.

Q: What are the available surface and end conditions for these bars?

A: A453 660 bars are supplied in surface conditions such as polished, black, bright, peeled, turned, and ground finishes. End conditions include plain, threaded, and chamfered, supporting varied uses in mechanical assemblies.

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