--Greetings,I hope youre into power generations, where you touch, boilers, power and process...Find my reply below in green, rest acceptable..( As per my knowledge 1) PWHT temperature for ASME P number 04 material is different from ASME B31.3 (process) : range 704-746°C to ASME B31.1 (Power) : range 650-700°C.)Reply: I have 2016, 31.3 vs 12, 31.1, which does not has this major difference for P no 4, to be precise (.3) comes with 650 to 705, where as (.1) with 650 to 700, which is acceptable. there are other P nos which has more than 5 Deg variations, which is not your case.Below I have given some WPS parameters for PWHT, please clarify me whether the parameters are correct or Not.According to B31.3 -Material : ASTM A 335 P11 to ASTM A 335 P11 - ( PNo-4; G.No-1 to PNo-4; G.No-1 )Process : GTAWTest coupon Thickness : 19.05 mmReply: why do you go with full GTAW for 19.05??PWHT- Temp range - 690°C- 705°CReply: 690 is okHeating range : 200°C/hrCooling range : 200°C/hrInterpass temp : 315°CPost Heating : 300°C -350°C ; holding thickness 10mm to 20mm -30 min / 20mm to 30mm - 90min.Reply: i made something like this and approved, A minimum of 25% of the groove weld is filled, the weldment is sufficiently supported with Post heating gradually increasing as per the WPS requirement 400 deg C at 2 hours after the welding completion, the bottom line is started after 25% with gradual fullfilled post heating after weld completion for continous 2 hours at 400 deg C.And regarding Backing - PQR is qualified with Argon, can we use Nitrogen in WPS.Reply: read QW-408.2.YoursMOHAMED MUNEEB MAHABOOB+91-786-700-444-6 TRZ - INDIA''The first man landed on earth has reference still today - so anything you do in your life check for reference, if you dont find then what you are doing is wrong, try to find''
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Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
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