http://xn--e1aabhzcw.xn--c1avg.xn--p1ai/dat/codes_doc_1890.pdf
API 934-C, which is the specification for materials requirements for heavy wall thickness 1 1/4 Cr-1/2 Mo forgings, states that it can be challenging to achieve the required toughness property in shells with wall thicknesses greater than 100mm. The difficulty in achieving the required toughness in thick forged shells of 1 1/4 Cr-1/2 Mo steel can be attributed to several factors.
Firstly, as the wall thickness increases, the heat transfer during the forging process becomes slower. This slower heat transfer can lead to uneven cooling rates, resulting in non-uniform microstructures and potential variations in mechanical properties, including toughness.
Secondly, the thicker sections of the forgings may experience longer cooling times, increasing the risk of microstructural transformations that could negatively impact the material's toughness. For example, slow cooling rates can promote the formation of coarse grain structures or the precipitation of undesirable phases, reducing the overall toughness of the material.
Additionally, the high hardenability of 1 1/4 Cr-1/2 Mo steel can contribute to the difficulty in achieving the required toughness property in thick forgings. The rapid quenching required to achieve the desired mechanical properties may lead to non-uniform cooling within thicker sections, resulting in variations in microstructure and potential impact on toughness.
Carlos Francisco Lucena Gonzalez Thank you sir, for your clear explanation.
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