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SERVICES

Warning:  All of our photos have copyrights. It is in violation of federal and state copyright law, if anyone attempts to download for its commercial or personal use.

Welcome to PNP Special Alloys Inc.

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Seamless Tubes and Hot-Rolled Plates

PNP Special Alloys is working closely with our steel mills group and PNP can supply a variety of high-quality seamless tubes and hot-rolled plates to several industries, including petrochemical and power generation. Our steel mills group produce a wide range of steel grades, including carbon steels, alloy steels, and special alloys. For more information on how our steel making procedures and the applicable ASME, ASTM standards, please email or contact us.   We provide each customer of every order what our steel making procedures are, including a list of check lists and Non-Destructive Tests according to the ASME, ASTM, NACE, PED, ISO and other applicable European standards.

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Customizd Production

At PNP Special Alloys, we pride ourselves on our ability to produce customized steel products based on our clients' unique needs and specifications. Our team of experts works closely with customers to ensure that every order is tailored to meet their specific requirements and exceed their expectations.

Besides, we help our customers gain the competitive edge of price, quality and delivery time.  For a detailed list of our steel grade, feel free to email us.  We are here to help you and serve your company's need.

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Quality Control

We are committed to providing our clients with the highest quality steel products possible. To ensure this, we have a rigorous quality control process in place that includes testing and inspection at every stage of production.  Our steel mills group strictly carry out the Six Sigma, which focuses on reducing defects and variations through statistical analysis, while our steel mills group's 6S focuses on workplace organization and safety.   Our steel mills quality control systems, along with the state of art modern testing national lab, will ensure and prevent any errors in the steel making.  We conduct complete micro-etching and other impact-tests as well.  Our steel mills group issue Certificate EN 10204 type 3.1 (free) and Certificate EN 10204 type 3.2 (fees apply).

ABOUT
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Disclaimer:   We are not responsible for any types of errors nor the translation.  Translations of any materials into languages other than English are intended solely as a convenience to the non-English-reading public and are not legally binding. We have attempted to provide an accurate translation of the original material in English, but due to the nuances in translating to a foreign language, slight differences may exist. References identifying the original document in English are available in most non-English documents.

ABOUT PNP SPECIAL ALLOYS

PNP Special Alloys, together with a major steel mills group, are supplying the pressure vessel plates to industries such as petrochemical and power generation. We are dedicated to providing our clients with top-quality steel products that meet their demanding needs and unique specifications. Our team of experts have years of experience in the steel industry, and we are committed to staying at the forefront of technological advancements in the petrochemical and power generation field.

25

many+

several+

various+

Years of Experience

Satisfied Clients

Custom Products Created

Industries

PROJECTS
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OUR PRODUCTS (our photos have copyrights)

For a list of our products, please refer to each of our products category.

OUR CLIENTS

CONTACT

CONTACT US

Inquiries

For any inquiries or questions, please call us at 925-787-5860 or email us at sales@pnpusa.com.  For Spanish language, please contact ventas@pnpusa.com  Be sure to specify your inquiry in details, including any special technical requirement, impact tests under minus degree and other chemical composition requirements.

Location

3478 Buskirk Ave. Suite 1000
Pleasant Hill, CA 94523
jzhao@pnpusa.com
Tel:    925-787-5860
Fax:   925-746-7101

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Employment

To apply for a job with PNP Special Alloys, please send a cover letter and your resume to info@pnpusa.com.

© 2026 PNP Special Alloys Inc. Todos los derechos reservados. Las fotos tienen derechos de autor

Un procedimiento de recubrimiento por soldadura (revestimiento de soldadura) consiste en depositar un metal de aportación especializado, resistente a la corrosión y al desgaste, sobre la superficie de un sustrato para mejorar sus propiedades y prolongar su vida útil. Requiere una limpieza cuidadosa de la superficie, una selección precisa del material de aportación (p. ej., acero inoxidable, aleaciones de níquel), parámetros optimizados (baja dilución) y la aplicación de múltiples capas.

Las superficies internas de reactores de hidrogenación, torres de síntesis de materias primas, reactores de licuefacción de carbón y recipientes a presión de paredes gruesas en centrales nucleares de la industria petroquímica requieren revestimientos de gran superficie con revestimientos de acero inoxidable resistentes a altas temperaturas, al oxígeno y al sulfuro de hidrógeno. En la década de 1970, la tecnología de soldadura por arco sumergido (SAW) de banda se adoptó ampliamente a nivel nacional e internacional en este campo. El ancho del electrodo de banda también evolucionó, pasando de bandas estrechas a bandas anchas de 60 mm, 90 mm, 120 mm y 150 mm. Esta tecnología representó una mejora significativa con respecto a la soldadura por arco sumergido con alambre en términos de tasa de dilución y velocidad de deposición. Sin embargo, con el aumento del tamaño y los parámetros más elevados de los recipientes a presión, la tecnología de revestimiento se ha orientado hacia una mayor calidad y eficiencia. A principios de la década de 1970, Alemania inventó la tecnología de soldadura por electroescoria de banda, que posteriormente fue mejorada por Japón, Estados Unidos, etc. Gracias a su mayor eficiencia de producción, menor tasa de dilución y mejor formación de la soldadura en comparación con la soldadura por arco sumergido de banda, se ha desarrollado rápidamente y se ha generalizado su uso en la actualidad.

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Un procedimiento de recubrimiento por soldadura (revestimiento por soldadura) consiste en depositar un metal de aportación especializado, resistente a la corrosión y al desgaste, sobre la superficie de un sustrato para mejorar sus propiedades y prolongar su vida útil. Requiere una limpieza cuidadosa de la superficie, una selección precisa del material de aportación (p. ej., acero inoxidable, aleaciones de níquel), parámetros optimizados (baja dilución) y la aplicación de múltiples capas.

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