Note: a cold pull rods, round cakes and ring blank standard (Ti) 1.80% ~ 2.35%.
2 (B) of hot-rolled and cold-rolled sheet standard 0.003% ~ 0.010%, 2.00% or less (Mn), (P) acuities were 0.020%, 0.015% or less (S).
3 (Al) of cold drawn wire standard acuities were 0.35%, 1.75% ~ 2.35% (Ti) and (Si) 0.40% ~ 1.00%, 0.020% or less (P), (S) of 0.015% or less.
Use the wire, cold heading standards (Ti) 1.75% ~ 2.35%, 0.40% ~ 1.00% (Si), (P) acuities were 0.025%, 0.020% or less (S).
5 hot rolled and forged bar standard (Cu) of 0.25% or less.
1.5), heat treatment system is the standard heat treatment system are shown in table 1-3;Alloy is 900 ℃ heat treatment system plus or minus 10 ℃, 1 to 2 h, oil cooled to + 750 ℃ + 10 ℃, 16 h, air cooling.