HARDNESS TESTING

Date 12-03-2007 16:13 Edited 12-03-2007 22:39

I havn't understood your question.
Let's imagine a fitting (a tee, for example), a piece of pipe and a flange.
The tee and the pipe ends are beveled and ready for welding. On the bevel, we measure 1.5 mm from the outside diameter and 1.5 mm from the inside diameter. By means of a portable hardness meter we measure the hardness in those points. All right. Now, how will we measure the hardness in the center ?
Apart from that, why do you want to measure the hardness of a new tee and a new piece of pipe? If there's a hardness requirement for them, the manufacturer is supposed to take care of that.
Similar considerations can be done for the flange, except that in this case the outside diameter is the outer periphery of the flange.
Giovanni S. Crisi
Sao Paulo - Brazil

By mujibali_m_a (*)

Date 12-04-2007 07:55

MR CRISI MY QUESTION IS WHERE THE MANUFACTURERS ARE TESTING THE HARDNESS FOR PIPES & FITTINGS?

By G.S.Crisi (****)

Date 12-04-2007 14:06

Carbon steel fittings are usually made to ASTM A 234 Gr. WPB.
Carbon steel pipes are usually made to ASTM A53 or A106. Chrome moly pipes are made to ASTM A335.
Carbon steel flanges are made in most cases to ASTM A105.
Take a look at those standards to see whether they require hardness test. If so, the same standard will say how the test is made and will state any possible reference standard.
Giovanni S. Crisi