Descripción
Quenched-and-tempered Cr-Mo alloy steel
ASTM A193 B7 Alloy Steel Threaded Rod
High-strength continuous threaded bar for pressure equipment, refinery piping, flange joints, supports and engineered fastening assemblies.
Descripción general del producto
ASTM A193 Grade B7 threaded rod is manufactured from chromium-molybdenum alloy steel, commonly based on 4140 o 4142 chemistry, and is quenched and tempered to achieve the required mechanical properties. ASTM A193/A193M is intended for high-temperature or high-pressure bolting and other special-purpose applications.
Unlike a finished stud bolt cut to a joint-specific length, threaded rod can be supplied in standard stock lengths or cut to the approved bill of materials. The order should state the governing standard, calificación, diameter, serie de hilos, longitud, coating and inspection requirements.
ASTM A193 B7 threaded rod specifications
| Bolting standard | ASTM A193/A193M, ordered edition |
|---|---|
| Calificación / material | Grade B7, chromium-molybdenum alloy steel; commonly 4140/4142 type |
| Tratamiento térmico | Quenched and tempered to the ordered specification |
| Sistemas de hilos | ASME B1.1 UNC, UNF o 8UN; ASME B1.13METRO / ISO metric when ordered |
| Rango de tallas | 1/4–4 in and M6–M100 typical manufacturing range; project review required |
| Longitud | Stock or cut-to-length; custom lengths to drawing |
| Compatible nuts | ASTM A194 Grade 2H commonly specified, subject to design requirements |
| Finish options | Plain, black oxide, zinc, hot-dip galvanized or fluoropolymer coating |
Dimensiones finales, tolerancias, tratamiento térmico, revestimiento, Los criterios de prueba y aceptación siguen la orden de compra confirmada y la edición estándar aplicable.. La disponibilidad depende del diámetro., longitud, Forma del hilo y cantidad de producción..
¿Por qué especificar este material??
B7 is widely selected where carbon-steel all-thread lacks the required strength or temperature capability. It offers a practical combination of availability, machinability, heat-treatment response and established use in pressure bolting.
nota de ingeniería
Coating selection changes friction and therefore affects torque-to-tension behavior. Confirm lubricant, nut grade, coating system and installation procedure together; do not reuse generic torque values without engineering approval.
Aplicaciones típicas
Calidad, inspección y documentación
B7 verification should link starting material, tratamiento térmico, pruebas mecanicas, hardness and thread inspection to the finished lot. Coated products should retain traceable marking and include coating inspection when specified.
- EN 10204 3.1 certificado de prueba de materiales
- Número de calor y trazabilidad de lotes.
- Composición química y propiedades mecánicas.
- Inspección dimensional y calibrado de roscas.
- PMI para aleaciones de níquel y acero inoxidable cuando se solicita
- Espesor del recubrimiento o inspección de la superficie cuando corresponda.
- Inspección de terceros y pruebas adicionales por acuerdo
- Marcado de exportación y embalaje marítimo.
Información requerida para la cotización
- Grado de material, Material aplicable/estándar de empernado y edición requerida.
- Diámetro, serie de hilos, paso y clase de rosca o tolerancia
- Longitud total, Requisitos y cantidad de extremos cortados.
- Tratamiento térmico, acabado superficial o sistema de recubrimiento
- Tuercas y arandelas a juego, incluidos los requisitos anti-excoriación
- Plan de inspección, MTC, PMI, Requisitos de ECM y testigos de terceros
- Destino de entrega, embalaje y horario requerido
Preguntas frecuentes
What material is ASTM A193 Grade B7?
Grade B7 is a quenched-and-tempered chromium-molybdenum alloy steel commonly produced from 4140 o 4142 type material. The ASTM grade requirements, not a commercial alloy name alone, control acceptance.
Which nut is used with B7 threaded rod?
ASTM A194 Grade 2H heavy hex nuts are commonly paired with B7 bolting. The final nut grade, style, coating and thread fit must follow the project design.
Can B7 threaded rod be hot-dip galvanized?
Galvanizing can be supplied in suitable sizes when allowed by the project, but thread allowance, nut oversize, coating temperature and hydrogen-related controls require review.
Is B7 the same as B7M?
No. B7M has additional heat-treatment, hardness and testing requirements intended for controlled-hardness service. The grades should not be substituted without engineering approval.
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