hardness weld metal SA 516 Gr70 2

[hkjoe]

Hi, Has anybody realated links for hardness (ASME???) or valuable results of hardness test on SA 516 Gr70 (1"= 25mm thickness) without PWHT, parent metal, HAZ, weld metal.
Thanks

 

[metengr]

Yes, I do. As-rolled or normalized plate?

Background:The ASME B&PV Code is currently evaluating revising the existing thickness limitation on P-No 1 materials from greater than 3/4" in Section I to 1.25" thickness or less, based on carbon equivalent. As part of this evaluation, a white paper was generated on this subject with extensive hardness testing of the base metal and base metal HAZ. Cooling rate, number of weld passes, preheat requirements and base metal thickness were evaluated.

My eye-ball microhardness (HV scale) estimates from graphs

BM away from the weld < 200 HV
Peak hardness ~225 HV
Weld metal hardness should be between the BM and HAZ hardness.

 

[hkjoe]

Thanks a lot. My idea was max. 250HV10. We are welding SA516 Gr70, 28mm vertical up by EGW (tank) and I expect higher hardness espec. at the HAZ because of a short Ts 8/5 time and high heat input (kJ/m). Cheers

 

[stanweld]

Hardness test results using this process on the same material in the as-welded condition without preheat were as high as 292 HV10 in the HAZ. Average about 260 HV10. Work was performed this month.