郑文超, 夏旺苟, 何浪, et al. Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft[J]. Special Steel, 2019, 40(1): 43-46.
郑文超, 夏旺苟, 何浪, et al. Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft[J]. Special Steel, 2019, 40(1): 43-46.DOI:
The production process flowsheet of steel C38N2 (/% : 0. 36 〜0.40C
0. 50 ~0. 65Si
1.40 ~ 1. 55Mn
≤ 0.025P
0.010 ~0.040S
0. 10 ~0
25Cr
≤ 0.01A1
0.015 ~0.020N) is 120 t-BOF-LF-RH-410 mm x 530 mm bloom casting-continuous rolling to Φ170 mm products. The statistics of effect of refining slag basicity (2. 0 ~ 2. 5 )
Ca content in finished steel (0 ~ 0.075%)
tundish shielding agent basicity (5. 94 and 1.70)
secondary cooling water (0. 14 ~0. 24 L/kg) and mould electromagnetic stirring current (250 A and 100 A) on sulfide in steel has been analyzed. With process measures including using 2 ~3 low basicity slag .in refining
controlling [ Ca]/[ S]>0. 03
using tundish shielding agent basicity 1. 70
secondary cooling water rate 0. 24 L/kg and mould electromagnetic stirring current 100 A
the ratio of rating ≤2. 5 of A-thin series sulfide in steel increases from 80% before process improvement to 95%
and the fine
dispersed distributed spheroidal and spindle-shaped sulfide in steel increases markedly.