Thursday, April 12, 2012

[MW:14104] Hardness value without PWHT

Dear experts,
I have faced regarding hardness issue on ASTM A 335 GR P-11 material.
Pipe thickness is 7.5mm. Without PWHT hardness is coming around 275
to 289 BHN on weld zone & 250 260 BHN on HAZ zone & parent material
hardness is 197 to 204 BHN. Due to inside refractory material PWHT is
not possible.
My question is as per ASME B-31.3/ ASME SEC II PART A hardness value
of this material is 225 BHN ( MAX). There is any specification for
weld zone / HAZ zone hardness value.
Can anybody give an idea to reduce the hardness without PWHT if it is
not acceptable limit.
Thanx in advance.

Regards
Pradip

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