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Hi, The latest version of SA240 now specifies that 409 S/S is obsolete and replaced with 40910, 40920 or 40930. The differences between them being different amounts of Ti and Cb. The mill can provide either of these standards when 409 S/S is order under the A240 specification. Has anyone...

Thank you metengr for your detailed explanation. It has been a big help. Also thanks eyec for the suggestion near the headers Alex

For T22 material, according to ASME Section I Table PW-39, it is not necessary to post weld heat treat provided a minimum pre-heat of 300 F is used along with a few other requirements. My concern is if the lack of post weld heat treatment in this case will adversely affect the resistance to...

The application is a steam boiler so the U bends will see water, steam and a mixture. Most of the unit in fact will have some wetness except the bottom couple of rows which will be superheat. I guess in this case post bend stress relief would be required. In this application, the water...

ASME code does not require T22 tube bends to be post bend stress relieved. However, what is the industry practice? Should T22 material bends be stress relieved to reduce possibility of cracking or corrosion. Or perhaps these are non-issues with this type of material? Thanks, Alex

Thank you for the leads! alex

Hello, Does anyone know of T11 and T22 mill supplier contacts. We require 1" and 1.25", 0.072 to 0.106" thick tubes. Thanks, Alex

Thank you everyone for posting and helping on this issue. Alex

Hello, I have an application where we are expanding tubes into a boxed header. The fluid through the tubes is natural gas. I have a couple of questions that hopefully someone can help. The header and tube circuits are designed to ASME SECTION VIII. (1) For grooved header holes, what is the...