Descripción
A-286 precipitation-hardening high-temperature bolting
ASTM A453 Calificación 660 A-286 Pernos prisioneros Clases A-D
ASTM A453 Calificación 660 A-286 stud bolts and matching bolting components supplied in the exact Class A, B, C or D condition required by the pressure-equipment or valve-flange specification.
respuesta rapida
ASTM A453 Calificación 660 is an A-286 nickel-iron-chromium precipitation-hardening alloy bolting grade for high-temperature service. ASTM A453 covers Classes A, B, C and D; the purchase order must identify the exact class because heat-treatment and mechanical-property requirements differ.
Product at a glance
Cuáles son ASTM A453 Calificación 660 pernos prisioneros?
ASTM A453 Calificación 660 bolting is manufactured from the precipitation-hardening alloy commonly known as A-286, with UNS designation S66286. The alloy is used where high-temperature strength, oxidation resistance and an expansion coefficient closer to austenitic stainless steels are important to joint design.
ASTM A453 covers studs, pernos prisioneros, nuts and other bolting forms for high-temperature service. Calificación 660 is divided into Classes A, B, C and D. Because class affects the ordered material condition and properties, a quotation that says only “A-286 stud bolts” or “Grade 660” is incomplete for procurement.
ASTM A453 Calificación 660 stud bolt specifications
| Material | A-286 nickel-iron-chromium precipitation-hardening alloy |
|---|---|
| designación estadounidense | UNS S66286 |
| Grade and classes | ASTM A453/A453M Calificación 660 Classes A, B, C or D |
| Configuración | Fully threaded stud bolt, double-end stud and matching bolting components as specified |
| Threads | UNC, UNF, 8UN or project-specified series and class to ASME B1.1 |
| Dimensiones | ASME B18.31.2, equipment bolting schedule or approved drawing |
| Matching nuts | Calificación 660 nuts or other compatible bolting specified by the design |
| Documentación | MTC, clase, tratamiento térmico, pruebas mecanicas, dureza, PMI and dimensions |
Dimensiones finales, tratamiento térmico, class or grade properties, revestimiento, testing and acceptance criteria follow the purchase order and contractually required standard edition.
ASTM A453 Calificación 660 Class A, B, C and D
ASTM A453 defines four Grade 660 classes. The class is part of the material designation and controls the applicable heat-treatment and mechanical-property requirements. The classes are not interchangeable by default.
| Clase | Order designation | Procurement instruction |
|---|---|---|
| Class A | ASTM A453/A453M Calificación 660 Class A | Order only when Class A is stated by the design; verify the Class A heat-treatment and property table in the required edition. |
| Class B | ASTM A453/A453M Calificación 660 Class B | Order only when Class B is stated by the design; do not substitute Class A, C or D without written approval. |
| Class C | ASTM A453/A453M Calificación 660 Class C | Order only when Class C is stated by the design; confirm diameter-dependent properties and processing requirements. |
| Class D | ASTM A453/A453M Calificación 660 Class D | Order only when Class D is stated by the design; record the complete Grade 660 Class D designation on the PO and MTC. |
Use the mechanical-property and heat-treatment tables in the contractually required ASTM edition. Do not infer a class from appearance, stock description or trade name.
Why specify this grade?
Specify Grade 660 when the approved design needs A-286 high-temperature bolting with strength, oxidation resistance and thermal-expansion behaviour suited to austenitic stainless pressure components. Select the class from the engineering specification, not from stock availability.
Critical engineering note
A-286 is a trade description, mientras ASTM A453 Calificación 660 Class A, B, C or D is a procurement designation. Neither the alloy name nor a generic tensile value establishes full compliance. Confirm class, diameter, tratamiento térmico, pruebas, nut condition and design temperature.
Stud, nut and finish options
Aplicaciones típicas
Calidad, inspección y documentación
Calificación 660 orders are reviewed by exact class before material commitment. Certificates identify the ASTM grade and class, alloy heat, processing condition, test results and finished-product traceability.
- EN 10204 3.1 material test certificate when ordered
- Heat-number and batch traceability from raw material to finished stud
- Chemical composition and mechanical-property records
- Heat-treatment record and hardness test results
- Dimensional inspection and calibrated thread gauging
- PMI when specified for chromium or A-286 alloy identification
- Superficie, coating or passivation inspection as applicable
- Third-party inspection, marking and export packing by agreement
Información requerida para la cotización
- ASTM standard, exact grade or class and required edition
- Stud diameter, longitud total, thread series and thread class
- Matching nut specification, grade or class, style and quantity
- Design and operating temperatures plus any cyclic or upset conditions
- Plain, passivated, coated or plated finish and approved process
- MTC, PMI, dureza, de tensión, coating and third-party inspection requirements
- Applicable piping code, equipment specification and owner supplements
- Cantidad, delivery destination, packing method and required schedule
Preguntas frecuentes
Qué es ASTM A453 Calificación 660?
Calificación 660 is an A-286 nickel-iron-chromium precipitation-hardening alloy bolting grade under ASTM A453/A453M for high-temperature service.
What is the difference between Grade 660 Classes A, B, C and D?
The classes have distinct ASTM heat-treatment and mechanical-property requirements. They are separate procurement conditions and should not be interchanged without engineering approval.
Is A-286 the same as ASTM A453 Calificación 660?
A-286 identifies the alloy family. A complete ASTM order also identifies Grade 660, the exact class, forma del producto, dimensiones, tests and required standard edition.
Can matching Grade 660 nuts be supplied?
Sí. State whether nuts are required, their exact grade or class, dimensiones, cantidad, condición de la superficie, testing and marking in the inquiry.
Related stud bolt products
Reference standard
Material and class requirements are controlled by ASTM A453/A453M. Thread form and stud dimensions may reference ASME B1.1 y ASME B18.31.2. State the contractually required edition in the purchase order and review all supplementary project requirements.
Solicitar cotización técnica
Send the grade or class, bolting schedule, nut requirement, condiciones de servicio, inspection plan and delivery destination for technical review.
