ASTM A453 grade 660 Fasteners Manufacturer
ASTM A453 Grade 660 is a high-strength, corrosion-resistant, austenitic stainless steel alloy designed for high-temperature and high-pressure applications. It is commonly used in power plants, petrochemical industries, aerospace, and offshore applications due to its superior strength and oxidation resistance at elevated temperatures.
A precipitation hardening stainless steel, Alloy A-286 (grade 660, UNS S66286) maintains superior strength at high temperatures up to 700°C, surpassing austenitic stainless steels. With a higher nickel content than Type 304, grade 660 also includes such elements as titanium and aluminum for hardening. Age hardening is used to precipitate ’ phase [Ni3 (Al, Ti)] making this an extraordinarily strong metal at high temperatures.
ASTM A453 grade 660 Equivalent grade
| Material No.1.4980 | EN DesignationX6NiCrTiMoVB25-15-2 | AISI/SAE660 | UNSS66286 |
| Alloy A-286 |
ASTM A453
Standard Specification for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
This specification covers standards for Grade 660 (Class A, B, C, and D) , Grade 651 (Class A and B), Grade 662 (Class A and B), and Grade 665 (Class A and B) of bolting materials for use in high-temperature service such as fasteners, for pressure vessels and valve flanges. Bolting materials in this specification covers rolled, forged, or hot-extruded bars, and also bolts, nuts, screws, washers, studs, and stud bolts.
According to ASTM A453 materials shall be subjected to tension, stress-rupture, and hardness tests. Materials shall conform to yield strength,
tensile strength, elongation, reduction of area, Brinell hardness, and Rockwell hardness requirements. Hardening and solution treatment requirements for each material class are also given.
Material Standard & Chemical Composition of A453 Grade 660
- Standard: ASTM A453
- Grade: 660 (Class A, B, C, and D)
- Material: Precipitation-hardened Austenitic Stainless Steel
- Equivalent to: A286 Stainless Steel (UNS S66286)
| ASTM A453 Grade 660 Chemical Composition Limits | ||||||||||||||
| Weight% | C | Mn | P | S | Si | Cr | Ni | Mo | Ti | V | Al | B | Co | Cu |
| ASTM A453 GR.660A | 0.08 max | 2 max | 0.025 max | 0.025 max | 1 max | 13.5-16 | 24-27 | 1-1.5 | 1.9-2.35 | 0.10-0.50 | 0.35 max | 0.0003-0.010 | 1 max | 0.50 max |
Mechanical Properties of A453 grade 660 A/B/C/D
ASTM A453 Grade 660 Heat Treatment Requirements
| Grade | Class | Solution Treatment | Hardening Treatment |
|---|---|---|---|
| Grade 660 | A | 1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench | 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool |
| Grade 660 | B | 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and liquid quench | 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool |
| Grade 660 | C | 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and oil quench | 1425 +/- 25° F [775 +/- 14°C], hold 16 hr, air cool, followed by 1200 +/- 25°F [650 +/- 14°C], air cool |
| Grade 660 | D | 1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and liquid quench | 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool, If required to achieve properties, second age: 1200 +/- 25°F [650 +/- 14°C], air cool |
ASTM A453 grade 660 Stud Bolt specification and Dimensions
- Thread Type: UNC (Coarse), UNF (Fine), Metric (ISO)
- Size:3/8″ to 4″ in imperial and upto M100 in metric sizes
- Thread Standard: ASME B1.1 (Inch), ASME B1.13M (Metric)
- Stud Bolt Dimensions: ASME B18.2.1 / B18.31.2
- Compatible Nuts: ASTM A453 Grade 660 Nuts
Why ASTM A453 grade 660?
Grade 660 is ideal for extreme temperature environments, maintaining strength even at 1300°F (704°C).
| Operating Temperature Range | Application |
|---|---|
| -100°F to 1300°F (-73°C to 704°C) | Power plants, aerospace, turbines, and high-temp bolting applications |
grade 660 Is an austenitic precipitation-hardenable stainless steel that is generally configured for long-term and high-temperature use, with a service temperature reaching up to 700 °C. It is considered as an iron-based superalloy due to its high strength and resistance to corrosion at high temperatures. Used in aviation and power engineering for heavy-duty rotors, gas turbine blades, steam turbines, pressure equipment parts and reactors, jet engines and rockets, exhaust systems. Also used in cryogenics.
Applications of ASTM A453 Grade 660 Stud Bolts
High-temperature and high-pressure bolting applications
Power plants (gas turbines, steam turbines, nuclear reactors)
Petrochemical & Refinery equipment
Oil & Gas (offshore drilling, pipelines, LNG plants)
Marine & Subsea applications
Typical Description for ASTM A453 GRADE 660 Stud bolt
STUDBOLT, 1 3/8″ IN DIA X180 MM LONG, FULLY THREADED, C/W 2 HEAVY HEXAGON NUTS,
MATL STUD BOLTS & NUTS ASTM A453 GRADE 660 CLASS A OR B (DUPLEX STEEL),
8UN THREADS TO ANSI B1.1 & TOLERANCES TO B1.1 CL 2A FOR STUDBOLTS &
ANSI B18.2.2 CL 2B FOR NUTS
