吴明洋. Analysis on Inclusions in Low Aluminium Steel 15CrMoG for Boiler Pipe Refining in 100t LF by Si-Ca Deoxidation[J]. Special Steel, 2018, 39(1): 65-67.
吴明洋. Analysis on Inclusions in Low Aluminium Steel 15CrMoG for Boiler Pipe Refining in 100t LF by Si-Ca Deoxidation[J]. Special Steel, 2018, 39(1): 65-67.DOI:
The production process flowsheet of steel 15CrMoG for high pressure boiler pipe (/% : 0.12~0.18C
0.17~0.35Si
0.40~0.70Mn
≤0.015P
≤0.015S
0.80~1.lOCr
0.40~0.55Mo
≤0.020Alt) is 60% hot metal + quality scrap- 100t UHP EAF-LF -VD-Φ500mm bloom casting-rolling. With Al-Si pre-deoxidation in EAF tapping
Si-Ca deoxidation in LF refining
and using optimized refining slag (/% ) : 55~60CaO
30~35A1
2
O
3
5~10SiO
2
(CaO)/( A1
2
O
3
) =1.41~1.74
the Alt content in refined liquid is 0.011%~0.014%. The analysis results on inclusions in Φ140mm and Φ160mm hot rolled products show that the ingredient of inclusions in steel is 10% MnS
75% calcium alum
inate
7.5% SiO
2
5% oxide containing Ti
and 2.5% others
and the ≤5.0μm inclusions make up more than 95% of the total mount of inclusions in steel to meet the technical requirement of steel 15CrMoG for boiler pipe.