--Hello Vishwas,
Please see the appropriate extracts from NACE SP-0472 for your information. Appendix C Summary of Cooling Time (t8/5) Concept is purely theorical. The explanations are clarified in the relevant text and figures. Yes a combination of preheat, control of inter pass temperature 2 dimensional vs 3 dimensional heat flow all are important factors to control hardness. The hardness requirements as per this document is clarified in Section -2 (as attached).
Note SP-0472 is not a design document. It's more of a supportive document to MR-0103. Hence for WPS/PQR qualifications one has to fulfil the requirements of MR-0103 ( when indicated in the contract) and SP-0472 only for the hardness control.
Your query does not state the design requirements. If the hardness of 248 HV10 meets the design requirements then the PQR should be accepted , provided all the welding control as per SP-0472 are fulfilled.
Thanks.
Pradip Goswami, P.Eng, IWE
Consultant-Welding-Metallurgical Engineering
Cell & Whatsapp-905-9793232.
From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Charles Jacob
Sent: July 5, 2020 3:21 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:31097] SP0472 STANDARD - WPS
Dear vishal,
Pl follow EN 1011-2. It gives complete details of welding requirements for steel. Summary of Cooling Time (t8/5) Concept is a general guidance on how to control cooling rates , in order to avoid
Regards,
Charles
On Sun, Jul 5, 2020, 11:07 AM Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:
WPS is prepared without PWHT with HARDNESS check in PQR .
It meets Hardness less than 248Hv10 along CE requirements as per SP0472
Std states that hardness Control shall be
1) CE control
and THERMAL TREATMENT - We intent to apply t8/5 concept.
We have to incorporate t8/5 in WPS as per Customer advice .
Can somebody throw light on SP0472 and t8/5 cooling time requirements / concept . How it is to be applied theoretically as well as practically during production usage
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