Swaging FAQsWhat is The Max Hardness Of Boiler Tubes?
Swage Tube Annealing
Metro Boiler Tube Co., Inc has the ability at our Ringgold, GA facility to anneal your swaged boiler tube ends per ASME Code or your specialized requirements with our in house heat induction sysrem.
Heat Treatment Proceedure
When swaged ends require heat treatment to satisfy ASME / Customer requirements the swaged area and the transition of the swage will be given appropriate heat treatment using an induction heating furnace with temperatures as follows:
Note: For any p numbers not listed above we will follow customer requirements.
Note: When wall thickness exceeds what is noted above heat treatment will be performed in a furnace to better control the holding time.
Material Hardness Requirements
As a general rule the hardness is returned to the origianal tube hardness as they were received from the mill.
Bent Swaged Boiler
Swaged Tube Sales
When placing an inquiry we will need the following information:
Note: For tubes swaged on both ends please provide dimensions A,B,(D or F) for both "Top" And "Bottom" Ends
Note: When providing Dim D (wall thickness) Please note an actual wall thickness is required not a min wall.
Swage Tube inspection
As a shop standard 10% of all swaging will be checked and documented by our Quality Control Department For Swage OD, Swage ID, Wall Thickness, Swage Length, And Hardness.
All surfaces shall be checked for burrs and smooth contours inside and out. Upon request our quality inspection can be increased up to 100%.
Swaging Standard Tolerances
All Inverse Drawn swages will have sponges blown through them to remove any excess lubrication each time an end is swaged. If needed the tubes will be steam cleaned to remove any remaining oil and debris.
Swaged Boiler Tube Polishing
Swaged boiler tube ends can be polished to remove scale and ease in the process of sticking them through the drums. Polished end will have a light coating of oil and 4" vinyl caps would be recommended to prevent corrosion in transit.