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Re: [MW:35812] A179 EXTRUDED - SERRATED FIN TUBE use which Fin Material is better?

By Materials & Welding

BS221-6061 has a higher tensile strength and is generally stronger than 6063. From a weldability point, 6061 can 

lead to issues such as cracking if not handled properly during the welding process.


BS221-6063 is easier to weld and has lower strength than 6061; it is often sufficient for applications where extreme 

strength is not a primary concern.


If the customer insists on 6061, specify a soft tempered 6061-O or 6061-T4, confirm with the fin manufacturer that 

their serrating/rolling equipment and process can handle 6061 without cracking.


C Sridhar.


On Fri, 12 Sept 2025 at 09:34, ę±Ŗę¢¦ä½³ <mia_yuhongsteel@foxmail.com> wrote:
As I received a inquiry recently, our customer insist to use BS221-6061 fin material for A179 EXTRUDED - SERRATED FIN TUBE. But our factory suggests to use  BS221-6063, as they thought 6061 is too hard to weld. Could you give some suggestion about whether 6061 could be fin material? 

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