It is composed of Q + number + quality grade symbol + deoxidation method symbol.It is composed of Q + number + quality grade symbol + deoxidation method symbol.It is composed of Q + number + quality grade symbol + deoxidation method symbol.It is composed of Q + number + quality grade symbol + deoxidation method symbol.It is composed of Q + number + quality grade symbol + deoxidation method symbol.It is composed of Q + number + quality grade symbol + deoxidation method symbol.