ASTM G48 Method A
ASTM G48 Method A
(OP)
We are performing a ASTM G48 test Method A for a welding qualification/ welders approval on duplex steel. The client request is a 24 hour test and requiring a test result by weight loss of 4g/m2 or better. The ASTM G48 Practice A test we normally perform is a 72 hour test not 24 hrs. The standard is not precise on time but suggests 72 hours. However, the criteria for evaluation to ASTM G48 Method A is less than 1 g/m2 (minimum)for the 72 hour test and not 4 g/m2 weight loss as specified in the request. The test specification in the ASTM G48 standard is a minimum requirement and not something that the client can change. Is this an acceptable request for the client to shorten the test duration by x3 and increase the weight loss allowable by x4 for a welding qualification/ welders approval?
Talk To Other Members
RE: ASTM G48 Method A
RE: ASTM G48 Method A
RE: ASTM G48 Method A
Did they define sample prep? ground or un-ground, pickled or not?
This is critical.
What is the test temp?
method A???? I thought that everyone had moved to using the acidified FeCl solution. It is more stable and repeatable, but slightly more aggressive.
Are they looking for pitting resistance or testing for intermetallics? These tests look nominally similar but the details are very different. You can't do both at once.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: ASTM G48 Method A
There is very little difference in results at 24 and 72 hours. Pitting either initiates or not, it isn't a rate issue.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: ASTM G48 Method A
They have also specified no intermetallics or affected structure to be present to ASTM A923 Test Method A and ferrite determination to E562.
RE: ASTM G48 Method A
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: ASTM G48 Method A
Pickle it hard, this will remove any detrimental surface issues and help meet this test value.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube