V microalloying technology the Φ 14 〜15 mm coil of steel SWRH82B (/% : 0. 79 ~ 0. 82C
0. 15 ~0. 35Si
0. 60 ~0. 90Mn
≤ 0. 025P
≤ 0. 006S
≤ 0.015As
0. 26 ~0. 32Cr
0.04-0.07V) with tensile strength ml 180 MPa has been developed. The 中14 〜15 mm coil of steel SWRH82B is produced by 100 t BOF-LF refining-160 mm x 160 mm billet casting with mold electromagnetic stirring-billet slow cooling-high speed wire-rod rolling- Stelmor wind cooling process at Shuigang
the sorbite content in structure of coil is up to 95%. The tensile strength of coil is 1 180 ~ 1 270 MPa and the reduction of area of coil is 27. 0% ~37. 5% to meet the requirements of large size and high strength steel strand for mine.