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TX 253 MA - TUBACEX’s constant evolution to offer new solutions for aggressive environments

Within its commitment to meet the highest demands of its customers, TUBACEX has completed its first order for tubes in TX 253 MA.

These tubes provide excellent cyclic oxidation response at high temperatures as well as very good mechanical and corrosion properties; characteristics needed in aggressive environments such as production of carbon black.

These tubes have been manufactured with Outokumpu Therma 253 MA billets as starting material, as part of a collaboration agreement signed by both companies last November. These billets are optimized for very high service temperatures to fulfill tough oxidation and erosion-corrosion resistance requirements. Every step of the tube manufacturing route, i.e. hot and cold forming processes, solution annealing treatment, finishing operations and inspection procedure, was carefully designed and controlled to obtain final tubes with an optimized microstructure and surface quality, which guarantee the optimal mechanical, oxidation and corrosion properties.

Tubacex uses an open innovation approach to develop solutions to satisfy the most demanding needs in technically challenging areas. Therma 253 MA presents excellent oxidation and erosion-corrosion resistance at temperatures up to 1100°C due to the addition of nitrogen and rare earth metals (which includes cerium) in combination with silicon. These alloying elements form a protective oxide layer with exceptional properties for application in the metallurgical, petrochemical and power generation industries.

TX 253 MA tubes combine Outokumpu’s experience in quality-critical long products and TUBACEX’s integrated manufacturing model, controlling product performance and technological processes.

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TX 253 MA

Compared to tubes manufactured in more common high temperature grades, such as 309S (UNS S30908) and 310S (UNS S31008), TX 253 MA tubes exhibit increased strength due to a higher nitrogen content and enhanced oxidation and corrosion response due to the increased elasticity and adherence of the protective oxide caused by the addition of rare earth metals and silicon.