Hastelloy B2

Hastelloy B2 (UNS N10665, W.Nr. 2.4617, GB NS322, NiMo28) es una aleacion niquel-molibdeno de endurecimiento por solucion solida, disenada especificamente para resistir medios reductores agresivos donde los aceros inoxidables convencionales fallan. Su aplicacion principal abarca el procesamiento de acido clorhidrico en todo el rango de concentraciones y temperaturas, asi como acido sulfurico, fosforico y acetico en condiciones no oxidantes. Pertenece a la familia de superaleaciones Hastelloy (Haynes International), concretamente a la serie B, caracterizada por base niquel con alto molibdeno y minimo cromo. Suministrada por SHUNFU METAL bajo certificaciones ISO 9001 y API Q1, garantizando trazabilidad completa desde la colada hasta el despacho final en cada lote producido.

Perfil de la Aleacion Hastelloy B2

Disenada con contenido ultra bajo de carbono (max. 0.02%) y silicio (max. 0.10%) para suprimir la precipitacion de carburos y fases intermetalicas en la ZAT durante la soldadura, eliminando la necesidad de tratamiento termico post-soldadura en la mayoria de las aplicaciones. Su alto contenido de molibdeno (26-30%) constituye el nucleo de su resistencia excepcional a acidos no oxidantes como HCl, H2SO4 y H3PO4. El control riguroso de hierro (max. 2%) y cromo (max. 1%) suprime la formacion de la fase beta Ni4Mo, responsable de la fragilizacion a media temperatura. Industrias objetivo: procesamiento quimico, petroquimico, farmaceutico, control de contaminacion, pasta de papel, energia y marina. SHUNFU METAL aplica fusion VIM mas refundicion ESR con analisis espectrometrico en cada colada, asegurando homogeneidad composicional y pureza metalurgica conforme ASTM B335, B333 y B622.

Grados Equivalentes de Hastelloy B2

La tabla siguiente recoge las designaciones internacionales de Hastelloy B2. SHUNFU METAL suministra bajo cualquiera de estas normas previa solicitud, certificando la doble o multiple conformidad en el certificado de inspeccion, lo que facilita la homologacion transfronteriza y reduce los tiempos de aceptacion en obra.

Norma / Sistema Designacion Especificacion
ASTM / ASME UNS N10665 B333, B335, B622, B366, B564
EN / DIN W.Nr. 2.4617 / NiMo28 EN 10095, DIN 17750
ISO NiMo28 ISO 9722
GB (China) NS322 / NS3202 GB/T 15007
AMS (Aeroespacial) AMS 5537 Sheet, Strip, Plate
BS (Reino Unido) NA44 BS 3072
JIS (Japon) NW0665 JIS H4551
AFNOR (Francia) NiMo28 NF A54-401
GOST (Rusia) ХН65МВ GOST 5632
Barra de aleacion Hastelloy B2 SHUNFU METAL
Barra Hastelloy B2
SHUNFU METAL

Aplicaciones Industriales del Hastelloy B2

Procesamiento Quimico

Reactores de HCl, columnas de destilacion, intercambiadores de calor, tanques de decapado, evaporadores, valvulas de asiento, camisas termometricas.

Petroquimica

Tuberias de acido sulfurico, valvulas de retencion, bombas centrifugas de proceso, bridas con cuello soldable, unidades de alquilacion, tanques de almacenamiento.

Control de Contaminacion

Torres de absorcion, lavadores de gases, recalentadores, ventiladores para sistemas de desulfuracion de gases (FGD), tanques de neutralizacion de efluentes acidos.

Industria Farmaceutica

Recipientes de reaccion, tanques de almacenamiento de acidos organicos, secadores al vacio.

Pasta y Papel

Digestores, equipos de blanqueo, recipientes de coccion, intercambiadores de lejia.

Energia y Marina

Componentes de plataformas offshore, sistemas de agua de mar con acidificacion, tuberias de proceso.

Cada componente suministrado por SHUNFU METAL se inspecciona mediante ultrasonidos y liquidos penetrantes segun ASME Seccion V, con certificados de material 3.1 conforme EN 10204.

Rango de Suministro de Hastelloy B2

SHUNFU METAL mantiene inventario estrategico en almacenes climatizados y produce bajo pedido con tiempos de entrega de 2 a 6 semanas segun forma y dimension. Toda la produccion se rige por ISO 9001 para gestion de calidad y API Q1 para trazabilidad en sector energetico. Cada pieza se identifica con numero de colada grabado y se entrega con certificado de inspeccion EN 10204 tipo 3.1.

Forma Proceso Rango Dimensional Norma
Redondo Laminado Laminacion en caliente Diam. 6 mm – 200 mm ASTM B335
Plano Laminado Laminacion en caliente / frio Esp. 3 mm – 120 mm, Ancho max. 3000 mm ASTM B333
Redondo Forjado Forja libre / anillo Diam. 50 mm – 800 mm ASTM B564
Plano Forjado Forja en matriz abierta Esp. 20 mm – 500 mm, Ancho max. 2500 mm ASTM B564
Tubo sin Costura Extrusion / pilgering Diam. ext. 6 mm – 325 mm ASTM B622

Composicion Quimica de Hastelloy B2 (ASTM B333)

La fusion en SHUNFU METAL emplea horno de induccion al vacio (VIM) con analisis por espectrometria de emision optica en cada colada, verificando todos los elementos conforme a los limites de ASTM B333.

Elemento Simbolo Contenido (%)
Niquel Ni Balance (~67-72)
Molibdeno Mo 26.00 – 30.00
Hierro Fe Max. 2.00
Cromo Cr Max. 1.00
Cobalto Co Max. 1.00
Manganeso Mn Max. 1.00
Silicio Si Max. 0.10
Carbono C Max. 0.02
Fosforo P Max. 0.04
Azufre S Max. 0.03

El control riguroso de Fe, Cr, C y Si suprime la fase beta Ni4Mo responsable de la fragilizacion, garantizando ductilidad optima tras soldadura sin necesidad de tratamiento termico posterior. El molibdeno es el elemento clave que proporciona tolerancia quimica frente a HCl en todo su espectro. SHUNFU METAL emite certificado de analisis quimico por colada como parte del paquete documental bajo su sistema de calidad ISO 9001, con valores objetivo internos mas restrictivos que los maximos de la norma para asegurar consistencia lote a lote.

Propiedades Mecanicas de Hastelloy B2 (Recocido por Solucion)

Tratamiento termico estandar: recocido por solucion a 1065-1175 °C con tiempo de permanencia controlado segun espesor, seguido de temple en agua rapido (max. 120 segundos desde salida del horno) para evitar la precipitacion de fases intermetalicas en el rango critico de 538-871 °C, donde las fases Ni4Mo y Ni3Mo causan fragilizacion irreversible. El laboratorio de SHUNFU METAL, acreditado bajo API Q1, certifica las propiedades mecanicas de cada lote mediante ensayos de traccion ASTM E8 y dureza ASTM E18 sobre probetas extraidas de la pieza de mayor seccion.

Propiedad Valor Minimo Unidad Norma
Resistencia a la Traccion (Rm) 760 MPa ASTM B335
Limite Elastico (Rp0.2) 350 MPa ASTM B335
Alargamiento (A5) 40 % ASTM B335
Dureza Max. 241 HBW HBW ASTM B335
Densidad 9.22 g/cm³ Calculado
Punto de Fusion 1330 – 1380 °C Rango

Advertencia: en servicio entre 538-871 °C precipitan fases fragilizantes (β-Ni4Mo). El limite de diseno segun ASME Seccion VIII es 427 °C para recipientes a presion. SHUNFU METAL incluye esta advertencia en su documentacion tecnica de despacho.

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