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Acceptable Hardness Value for Carbon Steels
Posted: 13 May 2010, 06:45
by arcpro
What are the acceptable limits of hardness value in HB for carbon steels?
Re: Acceptable Hardness Value for Carbon Steels
Posted: 13 May 2010, 07:08
by ashfaqanwer
For which carbon steel you are talking about?
Carbon content?
Re: Acceptable Hardness Value for Carbon Steels
Posted: 15 May 2010, 06:42
by arcpro
In the carbon steel we are dealing with the maximum carbon content is 0.18%.
Re: Acceptable Hardness Value for Carbon Steels
Posted: 15 May 2010, 06:56
by qaisarabbas
After PWHT, the Max. Limits of Hardness values for both Weld and HAZ areas are mentioned in Exxon's Basic Practices (BP-3-18-1), and these are given as:
a) 225 HB for P-1, P-3, P-4, P-10, P-11 Materials
b) 235 HB for P-5, P-6, P-7
The referred document also contains valuable information related to piping fabrication in shop & field.
Regards - Qaisar
Re: Acceptable Hardness Value for Carbon Steels
Posted: 15 May 2010, 07:19
by arcpro
Thanks Qaisar.
Anything below 225 HB for carbon steel weld and HAZ area is acceptable?
We have the values in the range of 110-130 HB on wled, HAZ and even on the base metal.