I have a question regarding the material of flanges
Thread Content
The customer ordered small flanges made of material 20#, but there are no longer any small round bars of material 20# available. Among A105 and 20Mn, which of these materials can be used as a substitute to meet the specifications? Also, should the material report specify 20#, A105, or 20Mn? Thank you all
It can be processed from steel plates; any change in material must be approved by the customer. It is not allowed to make such changes unilaterally without notifying the purchaser. The inspection report must be filled out accurately, otherwise it will lead to serious problems!
HG-T20592~20635-2009 _ Steel pipe flanges, gaskets, and fasteners – for reference
The material allows for a lower grade to be used; with the customer’s consent, a new material report should be provided. In your case, it is recommended to use 20Mn instead.
The material allows for a lower grade to be used; with the customer’s consent, a new material report should be provided. In your case, it is recommended to use 20Mn instead.
Thank you. Is 20Mn the equivalent of the new 20# according to Chinese standards, and is A105 the equivalent of the new 20 according to American standards?#
ASTM A105 is equivalent to GB 20#;
A105 will do; fill in the material report accurately
A105 will do; fill in the material report accurately
I remember we used A105 before; changing the material required the owner’s approval.
It’s A105; just agree with the customer and make it clear in the contract