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Up Topic American Welding Society Services / Technical Standards & Publications / AWS D1.1/D1.1:2015 Cl. 5.8 Stress-relief Heat treatment
- By Ropane Date 07-30-2018 08:21
Hi All,

First of all this is my first time on forum and I'm from Australia so please forgive me for the metric for length I will convert to decimal for Inches as well. My question is based around Cl. 5.8.1 (4) Above 600°F (315°C), cooling shall be done in a closed furnace of cooling chamber at a rate no greater than 500°F (260°C) per hour divided by the maximum metal thickness of the thicker part in inches (mm), but in no case more than 500°F (260°C) per hour.

Question: Maximum metal/material thickness = 0.63" (16mm), 500°F (260°C) divided by 0.63" (16mm) = 61.25°F/hr (16.25°C/hr) there is something going on with my interpretation here, the ramp down rate seems way too low.

Any help in shedding some light on the above would be appreciated.

Thankyou
- - By 803056 (*****) Date 07-30-2018 13:57
Math can be confusing.

500/0.63 = 794 degrees per hour. 794 degrees per hour is greater than 500 degrees per hour. Thus the maximum cool down rate would be 500 degrees per hour.

Al
Parent - By Ropane Date 07-30-2018 23:52
Cheers mate
Up Topic American Welding Society Services / Technical Standards & Publications / AWS D1.1/D1.1:2015 Cl. 5.8 Stress-relief Heat treatment

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