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Discussion on the chemical composition of 20 steel forged flanges

2026-01-15View Original

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Dear experts, I have a question: 20# forged flanges manufactured using round tube billets or bars produced in accordance with GB/T699-2015 or YB/T5222-2014 as raw materials. How to ensure that the chemical composition is qualified. I see that the standard GB/T699-2015 specifies a manganese content range of 0.35 to 0.65; in most cases, the manganese content is below 0.6. However, the 20# forged flanges (NB/T47008-2017) require a manganese content of 0.60 to 1.00. How can this issue be resolved?

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