A TUBE MADE OF SAE 1020 (LOW CARBON LOW STEEL) WHEN ANNEALED AT ABOUT 900°C PRODUCES DECARBURISATION DESPITE THE PRESENCE OF EXO GAS IN THE FURNACE.
THE TYPICAL CHEM COMPOSITION OF SAE1020 IS AS FOLLOWS,
C : 0.18-0.23 %
Mn : 0.3-0.6%
P: 0.03%(MAX)
S: 0.035(MAX)
Si : 0.2(MAX)
WOULD LIKE TO KNOW IF THE ALLOYING ELEMENTS HAS AN EFFECT ON DECARB ? BECAUSE THE GRADES LIKE SAE 1026 , SAE 1541, SAE1536 WHEN ANNEALED AT SAME FURNACE AND UNDER SAME CONDITIONS DO NOT PRODUCE DECARB.
IS IT BECAUSE OF LOW MANGANESE AND LOW CARBON THE SAE1020 IS MORE PRONE TO DECARB ?
ANY SUGGESTIONS / ANS FOR THE ABOVE QUERY IS HIGHLY APPRECIATED.
THANKS ,
VINOTH
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