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ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars

ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars

2400.0 INR/Piece
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Product Details:

  • Material Nickel Alloy Steel
  • Application Aerospace, Gas Turbine Components, High Temperature Fasteners
  • Length Custom Lengths / Up to 6 meters or as required
  • Specific Use High temperature and high strength applications
  • Finish Bright / Polished / Peeled
  • Type Type 1 & Type 2 Round Bars
  • Standard ASTM A638
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ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars Price And Quantity

  • 1 Piece
  • 2400.0 INR/Piece

ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars Product Specifications

  • 660 (Equivalent to Alloy A286)
  • 6mm - 200mm
  • Annealed / Aged / Solution Heat Treated
  • Hot Rolled / Cold Drawn
  • ASTM A638
  • H9, H10, or as specified
  • Type 1 & Type 2 Round Bars
  • Aerospace, Gas Turbine Components, High Temperature Fasteners
  • Custom Lengths / Up to 6 meters or as required
  • Nickel Alloy Steel
  • High temperature and high strength applications
  • Bright / Polished / Peeled
  • 895 MPa
  • Standard sea-worthy export packing
  • 15% min
  • Round
  • As per standard, typically 321 HB max
  • Excellent (suitable for harsh environments)
  • Non-magnetic in annealed condition
  • Smooth, scale-free
  • Wooden box or pallet with protection
  • 550 MPa
  • Solution Treated, Precipitation Aged
  • India

Product Description

ASTM A638 Grade 660 (commonly known as Alloy A286 or UNS S66286) is an iron-base, precipitation-hardening austenitic superalloy designed for high-temperature service (up to 1300F / 704C). It balances excellent high-temperature tensile strength, creep resistance, and oxidation resistance with comparable thermal expansion coefficients to standard austenitic stainless steels.

While the base chemical composition of Grade 660 remains identical for both types, the crucial distinction between Type 1 and Type 2 round bars lies in their heat treatment parameters, which adapt the material's microstructural stability and mechanical behavior for specific industrial environments.

Heat Treatment Specifications

The mechanical properties of ASTM A638 bars are developed via a two-stage process consisting of a solution treatment followed by a precipitation hardening (aging) treatment:

Designation / Type Solution Treatment Precipitation Hardening (Aging)
Grade 660 Type 1

$1650 pm 25^circtext{F}$ ($900 pm 15^circtext{C}$)


Hold for 2 hours minimum, liquid quench (oil or water).

$1300 text{ to } 1400^circtext{F}$ ($705 text{ to } 760^circtext{C}$)


Hold for 16 hours minimum, air cool (or furnace cool).
Grade 660 Type 2

$1800 pm 25^circtext{F}$ ($980 pm 15^circtext{C}$)


Hold for 1 hour minimum, liquid quench (oil or water).

$1300 text{ to } 1400^circtext{F}$ ($705 text{ to } 760^circtext{C}$)


Hold for 16 hours minimum, air cool (or furnace cool).

Core Distinctions & Applications

  • Type 1 (Lower Solution Temperature): Processing at $1650^circtext{F}$ results in a finer grain structure. This variant optimizes short-time mechanical properties, prioritizing higher room-temperature tensile strength, yield strength, and superior fatigue life. It is highly favored for cryogenic structural applications up to moderate high-temperatures.

  • Type 2 (Higher Solution Temperature): By dissolving more secondary phases during the $1800^circtext{F}$ solution soak, Type 2 promotes a slightly larger grain size. This provides superior creep-rupture strength and enhanced long-term microstructural stability when continuously subjected to extreme stress at elevated operating temperatures.

Typical Applications

  • Fasteners & Hardware: Heavy-duty clamping hardware, high-temperature stud bolts, and engine flanging.

  • Energy & Power Generation: Components for gas turbines, steam boilers, rotors, and pressure vessels.

  • Oil & Gas / Aerospace: Downhole tooling, valve components, exhaust systems, and afterburner parts.



Exceptional Mechanical Performance

ASTM A638 660 Type 1 and Type 2 Round Bars provide outstanding mechanical properties, including high tensile and yield strength, combined with notable elongation. This unique combination makes them reliable for critical applications subject to elevated temperatures and mechanical stresses, such as fasteners and turbine components.


Versatility in Application

These nickel alloy steel round bars are widely used across various sectors, notably aerospace, power generation, and gas turbines. Their ability to withstand extreme environments makes them an ideal choice wherever durability, corrosion resistance, and high strength are prerequisites.


Tailored Solutions and Quality Assurance

ASTM A638 660 bars are available in custom lengths, a range of diameters, and several finishing options (bright, polished, or peeled). Manufactured and supplied by leading Indian producers, the bars adhere to stringent quality control standards, ensuring precise tolerance and consistent performance.

FAQ's of ASTM A638 660 Type 1 Round ASTM A638 660 Type 2 Bars:


Q: How are ASTM A638 660 Type 1 and Type 2 Round Bars processed to achieve high strength?

A: These bars undergo a solution treatment followed by precipitation aging, which optimizes mechanical properties such as yield and tensile strength. The result is a product capable of withstanding high temperatures and stresses, commonly needed in aerospace and turbine applications.

Q: What applications are best suited for these nickel alloy steel round bars?

A: ASTM A638 660 Type 1 & 2 round bars are primarily used in aerospace components, high-temperature fasteners, and gas turbine parts due to their high strength, corrosion resistance, and durability in harsh conditions.

Q: When should I opt for ASTM A638 660 over other round bar grades?

A: Select ASTM A638 660 bars when your application demands excellent performance at elevated temperatures, non-magnetic properties, and high resistance to corrosion. They are especially advantageous in critical, high-stress environments.

Q: Where are these bars manufactured, and do they meet global standards?

A: These bars are produced in India by reputable manufacturers, fabricators, and suppliers. They conform to the ASTM A638 standard, ensuring global compatibility and acceptance for export and engineering projects.

Q: What are the packaging and export options available for these bars?

A: The bars are packaged in wooden boxes or pallets, protected for sea-worthy transport. This ensures the product arrives in pristine condition, suitable for international export and demanding environments.

Q: How can customers specify their requirements regarding diameter, length, or tolerances?

A: Buyers can customize their order by specifying the required diameter (6mm-200mm), length (up to 6 meters or as needed), and tolerance class (H9, H10, or custom) to suit their project or manufacturing needs.

Q: What benefits do these bars offer in high-temperature and extreme environments?

A: They provide superior mechanical strength, excellent resistance to corrosion, and non-magnetic characteristics in annealed condition, ensuring long-lasting performance in demanding settings like aerospace and energy industries.

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