Importance of manganese and phosphorus in ASTM A588 gr. C steel plate

Manganese is the necessary element for deoxidation in the process of making ASTM A588 gr. C steel plate. The strength of ASTM A588 gr. C steel plate can also be improved by solution strengthening. In order to achieve enough high tensile strength, the manganese content should not be too low, but too high manganese content will also deteriorate the welding performance and low temperature toughness of ASTM A588 gr. C steel plate, so its content is limited to 1.00-1.60%.

Phosphorus is a beneficial element to the properties of ASTM A588 gr. C steel plate. If the phosphorus content is too low, it is difficult to guarantee the weatherability of ASTM A588 gr. C steel plate. However, if the phosphorus content is too high, the low-temperature toughness of base metal and welded joint will be deteriorated. Especially in the welding process, the phosphorus in base metal will be excessive into the weld, forming eutectic, leading to the impact energy of welding joint of ASTM A588 gr. C steel plate is reduced, so its content is limited to 0.008-0.015%.

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