I need to find references or source for experience with Charpy impact test values for ASTM A53 Grade B pipe that shows minimum values vs. temperature. Thanks
You are not going to find much in this regard because A-53 is manufactured in so many ways; i.e., rimmed to fully deoxidized, with or without fine grain melting and finishing, furnace butt welded to seamless, etc. About 25 years ago, I conducted a study of over a hundred heats where the 15/12 ft.lb. criteria was used to determine transition temperature and it varied from from about 20 F to 150 F, average between 55 F and 60 F. Hope this helps.
If you need toughness in low strength carbon steel pipe, specify A-333 Grades 1 or 6.
You have a similar problem to me. I am looking to establish the charpy values of a pipeline steel of ERW x46 SMYS of 1979 vintage. I understand from other data it could be around 12-15 ft-lbs. However this data was at 20-25 deg c. I now need to understand what the values could be at around 0 deg C. have you got any of this information?
I had one question about impact test temperature.
The design pressure of the ethylene sphere is 28.5 barg, design temperature is ¨C54C. Diameter is 14.5m.
Base P.R China pressure vessel code, the impact test temperature should be in line with lowest design temperature. But I got messages from foreign mechanical engineer, if follow PD 5500, the impact test temperature could got bonus if wall thickness below 60mm.
For example, if wall thickness is 52mm, so the impact would be ¨C54+(60-52)= -46C.
So, I want to ask this rule is applicable for ASME material or other material except British.
I come from China.
Responding to paulandrews, if you cannot impact test coupons taken from the existing pipe, the following is recommended to help guestimate the low temp transition temp.
1. Obtain the chemistry for C, Mn, P, S, Si, Al, V , Nb.
2. In-situ microscopically examine for grain size.
If the grain size is fine (ASTM 7 or finer) and the Mn:C ratio is > 6 and the material is fully deoxidized (Si > .12), the X46 pipe should have toughness properties at 0C and below. Lower transition temperatures can be expected if P and S are low (<0.015%).
