What is the cold drawn steel material? Why did it break?
20 steel 45 steel Q235B a little more material, no annealing treatment
Should be low carbon steel, easy to break, because the carbon content of steel or impurities too much, but also later that its ductility is not good, in addition, low temperature is also easy to break
This should be the problem of raw materials, raw materials are hot-rolled round steel or steel, raw material impurities, there will be extended by cold drawing fracture phenomenon. Materials for large steel mills are proposed.
