FERRITE: a room temperature structure of steel formed when slow cooled from above the critical temperature. Low in carbon and relatively soft.
铁素体：从高于临界点的温度缓慢冷却下来时形成的一种钢铁常温组织结构。
2
Preheating shall be carried out for carbon and low alloy steel welding where required. Preheating temperature shall be kept uniform from the start to the end of welding.
在进行碳钢及低合金钢的焊接时应进行预热。预热温度在焊接开始到结束期间应保持均衡。
3
Carbon steel has high and lowtemperature strength is very tough and has excellent fatigue strength.