Once the metal is cleaned, treated, and painted, the strip is rewound into a coil size prescribed by the customer. From there, the coil is removed from the line and packaged for shipment or additional processing.
After the primer is applied and cured, then the metal strip enters the finish coat station where a topcoat is applied. Topcoats provide color, corrosion resistance, durability, flexibility and any other required physical properties. Like primers, the topcoat is cured using thermal cure ovens.
Oven
Coil coating ovens can range from 130 feet to 160 feet and will cure the coatings in 13 to 20 seconds.
During this stage, the strip enters the prime coat station whereby a primer is applied to the clean and treated metal. After the primer is applied, the metal strip travels through a thermal oven for curing. Primers are used to aid in paint adhesion, improve corrosion performance and enhance aesthetic and functional attributes of the topcoat.
S Wrap Coater
The S wrap coater design allows for primers and paints to be applied to the top and back side of the metal strip simultaneously in one continuous pass.
The cleaning and pretreating section of the coil coating process focuses on preparing the metal for painting. During the cleaning stage, dirt, debris, and oils are removed from the metal strip. From there, the metal enters the pretreatment section and/or a chemical coater whereby chemicals are applied to facilitate paint adhesion and enhance corrosion resistance.
Dried-In-Place
In this stage a chemical that provides enhanced corrosion performance is applied. This treatment can be chrome free if required.
The accumulator is a structure that adjusts up and down to store material, which makes continuous operation of the coil coating process possible. This accumulation will continue to feed the coil coating processes while the entry end has stopped for the stitching process. As much as 750 feet of metal can be collected.
Many AZZ employees lost homes, cars, and even simple necessities, such as clothing and mattresses during the worst flooding since Hurricane Harvey. In light of this recent flooding, the AZZ Cares Foundation is seeking donations for the employees who are in urgent need of assistance.
As an example of just one of the 19 plant workers who is requesting assistance, Ricky Harper, a production worker for AZZ Galvanizing – Beaumont, lost his car in the floodwaters while trying to take his wife, Stacey, to her monthly cancer treatment at MD Anderson in Houston. Hours later, the couple had to grapple with another loss – their home, which was in ruins because of the catastrophic flooding.
“Taking care of my wife and being blessed with a job is what keeps me going through hard times like this, said Ricky. “I’m the one who takes care of her, so I have to keep going no matter what.”
Please help all the AZZ employees impacted by the storm, and that have requested assistance, by donating today at: https://www.azzcaresfoundation.org/Beaumont. The AZZ Cares Foundation is supported 100 percent by generous donors like you, and is currently behind in reaching its yearly donation goal. To continue providing assistance to those in need, we urgently need your help. Please go online and donate today. Your donation is tax deductible, and 100% of all donations received go directly to those in need of assistance.
For more information about the Foundation’s mission, past successes, and to join our reoccurring donor program, please visit azzcaresfoundation.org.
Thank you for your continuing support and consideration,
AZZ Inc. is a proud provider of metal coating services, welding solutions, specialty electrical equipment and highly engineered services to the power generation, transmission, distribution and industrial markets, protecting metal and electrical systems used to build and enhance the world’s infrastructure. In recent months, AZZ has made two strategic acquisitions:
Tennessee Galvanizing Inc., a metal coatings company with four operating galvanizing lines, including centrifuge, rod, conveyer and a 42-foot structural kettle
Rogers Brothers Company, an Illinois-based organization that offers hot-dip galvanizing for light to medium weight structures and tubular fabrications.
Both of these strategic acquisitions help AZZ meet its goals of expanding their portfolio of services and provide AZZ a fresh opportunity to develop an additional range of services to their customers—the centrifugal (or spin) galvanizing of small parts, including washers, castings and fasteners.
Steel is utilized in a vast array of applications, including prodigious usage in the structural, mechanical and fabrication industries. Thus, protecting this key alloy from corrosion and critical mechanical property loss is crucial. Immersing steel in a bath of molten zinc, hot-dip galvanizing coats steel, providing a protective barrier that stands between it and the elements, preventing corrosion, resisting abrasion and prolonging life service. AZZ’s hot-dip galvanizing process is the most effective way to guarantee long-term protection of vital infrastructure and components.
For many reasons, hot-dip galvanizing is also an excellent method for delivering high-quality fasteners. First, it offers more consistent coverage and creates a material that is paintable. As the ultimate shield, the outer zinc layer preferentially corrodes to protect the steel beneath. And offering unmatched strength and hardness, a galvanized fastener is also difficult to damage during tightening. Finally, easily applied and repaired, this coating performs well in the harshest of conditions, spanning a wide range of temperature extremes.
However, fasteners are typically small–too small for traditional zinc kettles–and require a specialized spin method of hot-dip galvanizing as opposed to the standard method used for larger components. Using the centrifugal galvanizing processes for smaller parts, fasteners are placed in a perforated metal basket which is then immersed in the molten zinc bath. Once the metallurgical reaction is complete and the fasteners are fully coated, the zinc is drained from the basket, and the basket is then spun to remove excess zinc, ensuring a smooth coating that will provide superior corrosion protection. The specialized technique of this plant is both new and unique to AZZ’s capabilities. The addition allows AZZ to service a wider range of product sizes to meet the varying needs of its partners.
Con el más amplio portafolio de reparaciones de extensión de la vida útil, AZZ puede desarrollar una estrategia de reparación mediante un depósito de soldadura aplicado en forma automatizada de acuerdo con la Sección IX del Código ASME para restaurar la pared del equipo a su espesor original y extender la vida útil con la eliminación por desgaste causado por corrosión de las superficies internas de los digestores.
El proceso de fabricación de pasta
Fabricación de pasta es el proceso de extracción de la celulosa de la madera, plantas o de gran variedad de otras fuentes de fibra, disolviendo la lignina la cual mantiene las fibras de celulosa juntas. La pasta es el nombre dado al resultado de este proceso. Los cuatro principales métodos utilizados son: Kraft, Sulfito, Soda y semiquímico de sulfito neutro (NSSC). La selección del proceso es principalmente determinada por el producto final, viabilidad de material fibroso disponible y por cuestiones económicas relativas [1]. El proceso químico más común es el kraft con el 80% de participación en la industria representando 130 millones de toneladas de pasta kraft generadas por año.
La mayor parte de la fabricación de pasta se realiza en digestores batch, pero en los últimos años, digestores continuos han sido instalados con más frecuencia por su mayor eficiencia. Las astillas de madera, el licor de cocción y el vapor se combinan en un recipiente a presión para cada lote de producción. El tiempo de cocción depende de la producción deseada y de la dureza de la pasta, pero normalmente dura de 5 a 6 horas con temperaturas mantenidas entre 160 ° y 180º C. Al final del proceso, la presión del vapor en el digestor empuja el material cocido hacia fuera del mismo. La pasta sigue entre varias etapas de separación, lavado y otros tratamientos antes de ser prensada y secada en productos finales.
Materiales de construcción de Digestores Por Lote (Batch)
Los Digestores Batch se han construido históricamente en acero al carbono con la inclusión de un espesor admisible de desgaste para tener en cuenta los altos niveles de mecanismos de erosión y corrosión. En algunos casos, se aplicó una fina placa de revestimiento de acero inoxidable 304 en el proceso de fabricación para resistencia nominal de corrosión. Sistemas de cocción en lote (batch) han evolucionado los últimos años con el objetivo de reducir los costos de energía y de consumo de licor. Aunque se consideran satisfactorios en términos de funcionamiento, la mayor complejidad de los sistemas de control ha acelerado el deterioro de los recipientes y otros equipos relacionados, lo que hace que la elección de los materiales sea más importante que nunca. Al reparar o actualizar estos equipos muchos propietarios eligen el acero inoxidable 309 por el nivel de cromo, reconocido como el material más importante en la resistencia al ataque corrosivo del licor de cocción. La aplicación de revestimiento (overlay) de campo de acero inoxidable 309 ha sido frecuentemente usado para protección contra corrosión en ambos digestores continuos o batch hechos originalmente de acero al carbono. Más recientemente, se ha constatado que un número creciente de digestores batch con overlay de 309 han experimentado un aumento de la tasa de corrosión, por lo que el overlay con acero inoxidable 309 ha sido menos deseable para los digestores de este tipo y ha sido objeto de un cambio a materiales de mayor aleación.
ER312SS aplicado con el Proceso de Soldadura Automatizada de Campo patentado por AZZ
Debido al alto contenido de cromo en los materiales de aporte de acero inoxidable 312, la aplicación de overlay con este material era susceptible a agrietamientos por solidificación cuando es aplicado a sustratos de acero carbono. Para resolver este problema, los ingenieros de soldadura de AZZ desarrollaron un método patentado para eliminar los agrietamientos por solidificación de soldadura y minimizar el desajuste de expansión térmica de la capa de soldadura con el material base. El depósito de soldadura presenta microestructura duplex que consiste en ferrita y austenita. El depósito de soldadura solidifica primero los granos de ferrita y después ocurre la precipitación de los granos de austenita. El revestimiento con soldadura ER312ss resultante alcanza niveles superiores al 25% de cromo y se considera por exceder las necesidades de las operaciones en los entornos más corrosivos de los digestores batch. Digestores nuevos son frecuentemente producidos con aceros inoxidables duplex similares a aleación de 2025SS que es básicamente equivalente al ER312ss. El overlay de ER312ss sigue siendo una solución eficaz para extensión de la vida útil de estos recipientes y consecuente postergación de la sustitución, así como a la reparación viable de recipientes con aplicación de acero inoxidable duplex.
Soldadura Automatizada para ER312ss o para Otros Aceros Inoxidables Duplex
AZZ Specialty Welding es líder mundial en servicios de extensión de la vida útil de recipientes a presión. Con el más amplio portafolio de reparaciones de extensión de la vida útil, AZZ puede desarrollar una estrategia de reparación mediante un depósito de soldadura aplicado automáticamente de acuerdo con la Sección IX del Código ASME para restaurar la pared del equipo a su espesor original y extender la vida útil de su activo con materiales aleados. El proceso de soldadura automatizado GMAW, propiedad de AZZ, es ideal para las aplicaciones de diámetro interior de los digestores, especialmente por su probado atractivo económico en comparación con otros métodos más tradicionales. Construido por ingenieros de AZZ con parámetros monitoreados por sensores y sistemas de control digitales, el proceso automatizado de soldadura tiene la habilidad de ser fácilmente adaptado para aplicaciones de campo para lidiar con cualquier geometría y posiciones difíciles de soldadura que incluyen secciones cónicas de los digestores batch o continuos.
AZZ Specialty Welding – Resultados Comprobados. En forma Automatizada.
Ya sea que el digestor requiera reparaciones urgentes o durante paradas planificadas, AZZ tiene un liderazgo innovador sin igual en los mercados de papel y celulosa, nuclear, de refinación, de generación de energía e industrias química y petroquímica. AZZ tiene más de 2.000 procedimientos calificados de acuerdo con ASME y más de 1.000 certificaciones activas de soldadores. Conozca más sobre nuestras soluciones de ingeniería y tecnologías de soldadura en azz.com/WSI o síganos en LinkedIn.
The zinc oxide coating of galvanized steel acts as a critical barrier to protect the underlying steel from corrosion. To preserve aesthetics, regular cleaning is recommended. However, different filth and/or contaminates require different methods of cleaning, while certain chemicals or processes can ruin the galvanized finish.
With more than 40 galvanizing operations located throughout the U.S. and Canada, AZZ has been committed to developing hot-dip galvanizing processes for decades. Their extensive experience and expertise as a leading industry provider make them the preferred partner when it comes to maintaining your galvanized steel. As such, AZZ has compiled a list of tips for cleaning specific stains or debris from galvanized steel.
Whether it’s using a bristle brush or the proper PSI water pressure to remove common dirt and mud, to determining whether water storage stains merit stripping and re-dipping or just a simple ammonia cleaning solution, to which products are best suited to remove contaminants such as permanent marker, oil, grease or spray paint, these tips from AZZ can help ensure galvanized steel looks and performs like brand new for years to come!
Sign up to receive press releases, presentations and additional investor information.
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies. If essential cookies are disabled, the website may not function properly.
This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
Cookie
Duration
Description
cookielawinfo-checkbox-analytics
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional
11 months
The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy
11 months
The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.