Hastelloy C-22

Hastelloy C-22 (UNS N06022, W.Nr. 2.4602, GB NS3308, EN NiCr21Mo14W) es la aleacion mas versatil de la familia Hastelloy serie C. A diferencia de las aleaciones serie B (base Ni-Mo), el C-22 incorpora cromo (20-22.5%), molibdeno (12.5-14.5%) y wolframio (2.5-3.5%), lo que le confiere resistencia simultanea excepcional tanto en medios oxidantes como reductores. Este perfil dual la convierte en la opcion preferente para procesos quimicos con condiciones mixtas o variables. Suministrada por SHUNFU METAL bajo certificaciones ISO 9001 y API Q1, con ensayos de corrosion segun ASTM G28 en cada lote.

Perfil de la Aleacion Hastelloy C-22

Donde las aleaciones serie B destacan en medios puramente reductores (HCl, H2SO4 no oxidante) y las serie C tradicionales en medios oxidantes, la Hastelloy C-22 ofrece el espectro mas amplio de resistencia a la corrosion de toda la familia. Su alto contenido de cromo le proporciona resistencia excepcional a medios oxidantes como acido nitrico, cloruro ferrico, cloruro cuprico y cloro humedo, mientras que el molibdeno y el wolframio garantizan tolerancia en medios reductores. Es uno de los pocos materiales capaces de resistir cloro humedo, hipocloritos y dioxido de cloro. Su diseno de ultra bajo carbono (max. 0.015%) previene la precipitacion de carburos en la ZAT, permitiendo su uso en estado soldado sin tratamiento termico posterior. Industrias objetivo: procesamiento quimico, farmaceutico, control de contaminacion, incineracion de residuos, produccion de acido fosforico, energia geotermica y desulfuracion de gases (FGD). SHUNFU METAL produce C-22 mediante fusion VIM + ESR con analisis espectrometrico completo en cada colada, asegurando la composicion exacta conforme a ASTM B575, B574 y NACE MR0175 / ISO 15156-3 para servicio en ambientes con H2S.

Grados Equivalentes de Hastelloy C-22

El C-22 esta registrado en multiples sistemas normativos internacionales. SHUNFU METAL suministra con certificado EN 10204 tipo 3.1 indicando la conformidad dual o multiple, facilitando la homologacion en proyectos con requisitos de distintas jurisdicciones y la aceptacion por parte de organismos notificados.

Norma / Sistema Designacion Especificacion
ASTM / ASME UNS N06022 B575, B574, B622, B366, B564, B619, B626
EN / DIN W.Nr. 2.4602 / NiCr21Mo14W DIN 17744, EN 10095
ISO NiCr21Mo14W ISO 9723, ISO 6208
GB (China) NS3308 GB/T 15007
AMS (Aeroespacial) AMS 5525, 5731, 5858 Sheet, Bar, Wire
NACE / ISO NACE MR0175 ISO 15156-3 (servicio acido)
JIS (Japon) Referencia UNS N06022 JIS H4551
BS (Reino Unido) Designacion via EN/DIN BS EN 2.4602
AFNOR (Francia) NiCr21Mo14W NF A54-401
Chapa de aleacion Hastelloy C-22 SHUNFU METAL
Chapa Hastelloy C-22
SHUNFU METAL

Aplicaciones Industriales de Hastelloy C-22

Procesamiento Quimico

Reactores de mezclas acidas complejas, intercambiadores de calor de placas, valvulas de asiento para cloro humedo, evaporadores de acido mixto, tuberias de acido nitrico/clorhidrico.

Control de Contaminacion

Sistemas de desulfuracion de gases (FGD), lavadores de gases de incineracion, torres de absorcion, recalentadores, ventiladores de gases acidos humedos, tanques de neutralizacion.

Industria Farmaceutica y Alimentaria

Reactores de sintesis con catalisis acida mixta, tanques de almacenamiento de intermediarios corrosivos, sistemas CIP con acidos y oxidantes alternados, secadores y cristalizadores de alta pureza.

Energia Geotermica y Nuclear

Revestimiento de pozos geotermicos con salmueras acidas, intercambiadores de calor en ciclos binarios, componentes de regeneracion de combustible nuclear, valvulas de fluidos geotermicos.

Incineracion de Residuos

Lavadores de gases de combustion, intercambiadores de calor en corrientes con HCl/SO2, sistemas de depuracion de dioxinas y furanos, conductos de gases acidos a alta temperatura.

Pasta, Papel y Acido Fosforico

Equipos de blanqueo con dioxido de cloro, reactores de produccion de acido fosforico humedo (via sulfato), intercambiadores de lejia, tanques de ataque acido de roca fosforica.

El perfil de corrosion universal del C-22 lo convierte en la aleacion de referencia para proyectos que manejan quimicas mixtas. SHUNFU METAL inspecciona cada pieza mediante UT y PT bajo ASME Seccion V, con certificados EN 10204 tipo 3.1 y ensayos de corrosion intergranular ASTM G28 metodo A.

Rango de Suministro de Hastelloy C-22

SHUNFU METAL mantiene inventario de formatos comerciales de alta demanda y produce bajo pedido con plazos de 3 a 6 semanas. Cada pieza se identifica con numero de colada grabado, embalaje anticorrosion y certificado de conformidad bajo el sistema integrado ISO 9001 / API Q1.

Forma Proceso Rango Dimensional Norma
Redondo Laminado Laminacion en caliente Diam. 6 mm – 250 mm ASTM B574
Plano Laminado Laminacion en caliente / frio Esp. 2 mm – 100 mm, Ancho max. 2500 mm ASTM B575
Redondo Forjado Forja libre / anillo laminado Diam. 50 mm – 850 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 en frio Diam. ext. 6 mm – 325 mm ASTM B622 / B619

Composicion Quimica de Hastelloy C-22 (ASTM B575)

El C-22 representa la cima de la ingenieria de aleaciones Ni-Cr-Mo-W: el alto cromo protege en medios oxidantes, el molibdeno en reductores, y el wolframio potencia ambos mecanismos simultaneamente. La fusion en SHUNFU METAL se realiza por VIM con analisis OES de todos los elementos en cada colada, verificando conformidad estricta con ASTM B575 y NACE MR0175 nivel VII para servicio en ambientes amargos.

Elemento Simbolo Contenido (%)
Niquel Ni Balance (~56)
Cromo Cr 20.00 – 22.50
Molibdeno Mo 12.50 – 14.50
Hierro Fe 2.00 – 6.00
Wolframio W 2.50 – 3.50
Cobalto Co Max. 2.50
Manganeso Mn Max. 0.50
Vanadio V Max. 0.35
Silicio Si Max. 0.08
Carbono C Max. 0.015
Fosforo P Max. 0.02
Azufre S Max. 0.02

El alto Cr (20-22.5%) es el responsable de la excepcional resistencia a medios oxidantes como HNO3, cloruro ferrico y cloro humedo. El Mo (12.5-14.5%) y W (2.5-3.5%) actuan sinergicamente en medios reductores y contra la corrosion por picaduras y resquicios. SHUNFU METAL controla estos tres elementos dentro de bandas internas mas estrechas que la norma para garantizar consistencia de desempeno lote a lote, documentado en el certificado de analisis ISO 9001.

Propiedades Mecanicas de Hastelloy C-22 (Recocido por Solucion)

Tratamiento termico: recocido por solucion a 1120-1175 °C seguido de temple en agua rapido. Este ciclo disuelve carburos y fases secundarias en la matriz austenitica, maximizando resistencia a la corrosion y ductilidad. La temperatura de forja se situa en 1000-1230 °C, evitando trabajar por debajo de 870 °C para prevenir crecimiento anormal de grano. El laboratorio de SHUNFU METAL certifica cada lote bajo API Q1 mediante ensayos ASTM E8 (traccion) y ASTM E18 (dureza) sobre probetas extraidas segun la orientacion y seccion solicitadas.

Propiedad Valor Unidad Norma
Resistencia a la Traccion (Rm) 690 (min.) MPa ASTM B574/B575
Limite Elastico (Rp0.2) 310 (min.) MPa ASTM B574/B575
Alargamiento (A5) 45 (min.) % ASTM B574/B575
Dureza Max. 240 HBW HBW ASTM B574/B575
Modulo de Elasticidad (20 °C) 206 GPa ASTM E111
Densidad 8.69 g/cm³ Calculado
Punto de Fusion 1351 – 1387 °C Rango

Gracias a su alto contenido de elementos refractarios (Cr+Mo+W), el C-22 conserva propiedades mecanicas utiles hasta 925 °C (resistencia a la traccion de 15 MPa a 1000 h a 980 °C). Es apto para servicio en ambientes amargos segun NACE MR0175 / ISO 15156-3 nivel VII con dureza maxima de 35 HRC. Su baja permeabilidad magnetica (menor de 1.001) lo hace adecuado para aplicaciones que requieren no magneticidad. SHUNFU METAL adjunta los protocolos completos de ensayo en la documentacion de despacho bajo su sistema API Q1.

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