Abstract: The φ18 mm high strength spring steel 60Si2CrVAT(0.57C,1.65Si,1.04Cr,0. 13V)was produced by 100 t EBT EAF-LF(VD)- 300 mm×320 mm billet casting process at Xingcheng Special Steel. The S+ P content in finished steel was ≤200×10^-6 and average oxygen content ≤12×10^-6.Because the V carbon-nitride couldn't be dissolved completely below 900 ℃,the heat treatment test was carried out to obtain that the tensile strength was 1950~1970 MPa and elongation was 9%～12% by quenched at 910 ℃ for 60 min and tempered at 410 ℃ for 90 min.

摘要： 杭钢用80 t UHP DC电弧炉-钢包炉(LF)-200 mm×200 mm连铸及700×1／650×3轧机轧制,生产直径75 mm的Q390B低合金高强度圆钢。LF精炼时控制(％)0．16-0．19C,1．35-1．52Mn,0．03～0．05V,≤0．025S,≤0．025P,喂CaSi线并全程吹氩,连铸采用长水口保护浇注。检验结果表明,钢材具有良好的表面质量、低倍组织,夹杂物≤2．0级,钢的σB 380～465 MPa,σb 545～625 MPa,δ22．0％-28．5％,A_k 98-210 J。

关键词: 弹簧钢60Si2CrVAT, 淬火,回火, 力学性能