低碳钢是软而韧性好的钢，容易加工和焊接。
Low carbon steels are soft, tough steels that are easily machined and welded.
这种钢的强度高、韧性极低温度；
This steel excels in high strength, extremely low temperature toughness;
只有硬度而没有弹性和韧性的钢材称不上好钢；
Only the hardness and elasticity and toughness of the steel is not good steel;
只有硬度而没有弹性和韧性的钢材称不上好钢；
Only the hardness and elasticity and toughness of the steel is not good steel;
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