A106 is for pipes and A234 is for Fittings, as well as A105 are for forgings.
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For example when we compare between A106-B and A53-B seamless from chemical composition point of view, we find that :1. A106-B contains silicon, min. 0.10% where A53-B has zero%, and silicon is the important element for improving the heat resistance criteria.2. A106-B contains manganese 0.29-1.06%, where A53-B 1.2%.3. A106-B contains low sulfur and phosphorus, max. 0.035%where A53-B contains 0.05 and 0.045%respectively.
YES
In technical terms, "A234" refers to the ASTM standard specification for piping fittings of wrought carbon and alloy steel. On the other hand, "SA234" stands for the ASME standard specification for the same type of piping fittings. The key difference lies in the organizations that have developed these standards - ASTM (American Society for Testing and Materials) and ASME (American Society of Mechanical Engineers), respectively. Both standards provide guidelines for the manufacturing and testing of piping fittings, with ASME typically being more stringent due to its focus on pressure vessel and boiler applications.
St35
W=wrought p=pipe b=bend