Jiang Dongchu,Liu Congde,Yin Chuanlei.Research on the Production Practice of 09CuPCrNi Weather Resistant Steel[J].Special Steel,2023,44(06):8-11. DOI: 10.20057/j.1003-8620.2023-00069.
Research on the Production Practice of 09CuPCrNi Weather Resistant Steel
A steel mill uses "KR hot metal desulfurization→90 t converter blowing →LF refining →RH refining→150 mm×150 mm billet continuous casting" process for industrial production of 09CuPCrNi weathering Steel(/%: 0.07-0.13C, 0.35-0.65Si, 0.70-1.00Mn, 0.065-0.150P,≤0.010S, 0.10-0.30Ni, 0.30-0.70Cr, 0.15-0.40Cu,≤0.040Al). By the converter adopts a low slag content of 19 kg/t with a total amount of lime and dolomite, and the final slag binary alkalinity is controlled at 2-3 low alkalinity slag making. The low gun position blowing process with a blowing oxygen gun position of about 1.3 m achieves an endpoint
w
[P] ≥ 0.065% . The refining process adopts aluminum strong deoxidation , slag surface composite deoxidation to control the alkalinity of the refining slag by 7-9 and the calcium treatment of the ending of RH vacuum treatment and continuous casting weak cooling and other process measures successfully developed 09CuPCrNi weathering Steel . It has chemical composition stability and non-metallic inclusion level A≤1.0 grade, B≤1.5 grade, C :0 grade , D≤1.0 grade , DS≤1.5 grade and high cleanliness. There are no cracks on the surface and low magnification of rolled products. The grain size
>
6 levels and all indicators meet the technical requirements.