CS carboon steel It's a steel quality score lrss than 2.11% a,and do not contain alloy element It always called ordinary steel or carbon steel.Higher percent of carbon, higher strength, and lower flexible. 45# steel is a kind of quality carbon steel (lower contin phosphorus, sulphur),widely usedin universal tool material. CS-V steel CS-V steel is Cr and V alloy element alloy tool steel, it's strength and flexible abilty is better than carbon steel. Suitable to be ideal meterial of quality tool. Like wrench, socket,screwdriver etc. Cr-Mo Alloy by Cr,Mo,Fe,C.Better impact resistance,strength and flexible ability than Cr-V STEEL. Suitable for making screwdriver,ect.
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