Chrome moly solutions from Daemar offer wear resistance, easy fabrication

Daemar offers chrome moly elements.

Daemar Inc. supplies essential components for a broad range of applications, including ones that are made of chromium-molybdenum steel, or chrome moly. This low alloy steel provides additional strength that makes it ideal for high-pressure and high-temperature applications, with a unique blend of chromium and molybdenum that suits various industries.

Also known as “P Grade” material and available in the common forms P5, P9, P11, P22, and P91, chrome moly provides high tensile strength, high corrosion resistance, and high temperature resistance.

Often preferred over carbon

Among the additional advantages of using this metal are wear resistance, hardening, and easy fabrication. In modern power boilers, which frequently operate at pressures higher than 5,000 pounds per square inch and temperatures higher than 537 degrees Celsius, chrome moly is often preferred over carbon. The more the chromium and molybdenum are increased within the steel, the more allowable the stress is at higher temperatures and the stronger the steel is. Designers may choose tougher options like the P91 for thinner walls, or thicker wall pipes with less toughness with the P22 or P11.

With its unique properties, chrome moly is highly recommended for use in refineries, oil and gas pipelines, chemicals, heat exchangers, power plants, and pulp and paper. It can be tricky to select the appropriate version; Daemar suggests the following factors for design engineers to take into consideration:

• Creep resistance
• Fabrication time and cost
• Hardness measurements
• Number of loops and bends, and their configurations
• Number of operating cycles and thermal fatigue
• Preheating temperatures and post-weld heat-treatment temperatures
• Required physical strength
• Stress tolerance
• Upper-temperature limits
• Welding factors, including procedures, quality control, and filler material

Another vital consideration: the temperature of water or steam, pH, oxygen content of the liquid, steam quality, flow velocity, oxide layer quality of the internal pipe surface, and chemical composition. P5 and P9 chrome moly are appropriate for petroleum tasks, while P11 and P22 work for power generation, petroleum, and high temperatures, and P91 is recommended for power generation.

A diverse selection of chrome moly alloy pipes, flanges, and fittings are available from Daemar.

For more information, contact Daemar.

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