please put the details of a material, pass history of welding(welding parameters) and photograph to have a clear idea.
usually for CS it is ranges between 175-195 BHN
LAS (1.25 Cr 0.5M0) 205-220 BHN
(2.25Cr 1.0 Mo) 205-225 BHN
ASS 180-200 BHN
there are factors like PWHT is one of the leading cause of higher hardness.moreover roughness of a sample affects adversely. without those details it is difficult to which is the root cause of your problem.
Regards,
Vaibhav Joshi
On Fri, Sep 9, 2011 at 5:31 AM, pgoswami <pgoswami@quickclic.net> wrote:
Hello Inamdar,o
eer
T-TS qualification is well covered by ASME Sec-IX, 2007 edition onwards.Hardness requirement is more of process/service media driven requirement.Hardness limits are not covered in Sec-IX nor any of the design and fabrication codes ,such as ASME Sec-VIII,DIV-1 or DIV-2, though all the above codes mentions that hardness readings are to be taken, if required.
What's the design code ?Are there any additional specification requirements such as NACE MR-0103, MR-0175 or any of the API recommended practices?Is there any client's specification involved?If you could specify the details , it would help to provide precise answer.Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.netmailto:materials-welding@googlegroups.com] On Behalf Of Inamdar
Sent: Thursday, September 08, 2011 1:05 AM
To: Materials & Welding
Subject: [MW:12370] Hardness in Tube to tube sheet welding
I seek some guidance in the above.
Our Hardness for tube to tube sheet welding is coming above 250HV and the desired value is 210 Avg.
Can some body explain me the below:
1) Which code clealy specifies the maximum acceptable value of hardness in TTS welding.?
2) How to control the hardness without PWHT in TTS welding?
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