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Re: [MW:35838] Re: Hardness range for CS

By Materials & Welding
Is this PQR is with PWHT ?

On Fri, 17 Oct 2025 at 11:48 AM, Saurabh Jain <ensaurabh@gmail.com> wrote:
Dear Mohammed,

Thank you for your response.

We're facing another significant issue.

Most of our carbon steel Procedure Qualification Records covering groups G1-G2, G1-G3 & G2-G3, G3-G3 with various process combinations are showing an unacceptable hardness range (260–325 HV) in the Heat-Affected Zone.

Our maximum acceptable hardness limit is 250 HV.

We've used different testing agencies, yet the results remain consistently high.


Regards,

Saurabh


On Fri, 17 Oct 2025 at 8:26 AM, Mohmmed Dudhiyawala <mdudhiya007@gmail.com> wrote:
Dear Saurabh,
Refer Table A.12 of NACE MR0175/ISO 15156, where Inconel 625 is designated as Type 4d.
Refer Table A.14. From Temp<149°C, Inconel 625 can be used for all conditions, stipulated in table. Hardness to be limited to 40 HRC max. (392 HV).


Regards,
Mohammed

On Tuesday, August 19, 2025 at 7:47:46 AM UTC+5:30 Saurabh Jain wrote:
Dear experts.

I am currently in the process of qualifying a PQR for API 5L X65 + A350 LF6. Both material consists of a base metal with alloy 0625 cladding. Welding process: GTAW+SMAW

During the mechanical testing, I witnessed the following hardness values:
Clad material: 300 to 390 HV
Weld metal: 280 to 350 HV

This is for Aramco project, so I referred their standard 01-SAMSS-044, and it specifies that I must refer to NACE MR0175/ISO 15156 for hardness acceptance criteria, particularly for the clad.

I have reviewed the standard but cannot find a specific acceptable hardness range. I also checked Aramco's W-11/W-12 and W-16 standards but was unable to find the maximum allowable hardness for clad welding.

My question is: Are these recorded hardness values for the clad and weld metal acceptable under the NACE MR0175/ISO 15156 standard? If not, what are the typical hardness limitations and under which standard?

Regards 
Saurabh Jain

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