In general, the variation of mechanical properties and toughness of TMCP after PWHT is similar with those of conventional normalized steel. However the trends may have some fluctuation per element content (Ceq, Cb, V, etc.).
For the same quantitative data, normally the PWHT temperature of TMCP steel may be adjusted at lower temperature compare to that of conventional normalized steel.
Please find WRC Bulletin 371 for more detail information.
따라서 일반적인 강재에 비해 강도가 뛰어난 것이 특징이지요
용접후의 일반적인 응력 제거 수준의 열처리를 한다고 해서 입자가 성장하거나 강도가 떨어지거나 하지는 않습니다.