Si对半高速钢5Cr5WMoSiV冶金质量、组织和性能的影响  

Effect of Si on Metallurgical Quality,Structure and Properties of Semi-High-Speed Steel 5Cr5WMoSiV

作　　者：张占普 牛旭斐 迟宏宵[3] 马党参[3] 何宁 

机构地区：[1]河冶科技股份有限公司,石家庄052165 [2]河北省高速工具钢工程技术研究中心,石家庄052165 [3]钢铁研究总院特殊钢研究所,北京100081

出　　处：《特殊钢》2017年第3期56-60,共5页Special Steel

摘　　要：试验用5Cr5WMoSiV(HYRH12)钢(/%:0.53C,0.30~1.10Si,0.35Mn,≤0.025P,≤0.010S,5.30Cr,1.30Mo,1.20W,0.50V)的冶金流程为3 t感应炉-780 kg ESR-退火-110 mm方坯锻材-轧制Φ42.5 mm棒材-Φ14 mm轧材。研究了0.30%~1.10%Si和1010~1 070℃淬火+510~550℃回火处理对5Cr5WMoSiV钢冶金质量组织和力学性能的影响。结果表明,Si明显促进碳化物析出,显著提高钢的硬度;0.3%,0.7%,1.1%Si钢中含0.7%Si钢韧性和强度最低;而含0.3%Si钢,冲击韧性和抗弯强度最高。1 060~1 080℃淬火,含1.1%Si钢的HRC硬度值可达64。用于冷轧机中间辊时,5Cr5WMoSiV钢合适的Si含量为1.0%~1.2%,5Cr5WMoSiV钢传统推荐的热处理工艺为1 030~1 070℃淬火,520~540℃回火。The metallurgical flowsheet for tested steel 5CrSWMoSiV （ HYRH12, /% ： 0. 53C, 0. 30 -1.10Si, 0. 35Mn, ≤0. 025P, ≤0. 010S, 5.30Cr, 1.30Mo, 1.20W, 0. 50V） is 3 t induction furnace- 780 kg ESR- annealing-110 mm square billet forging-Ir42. 5 mm rolled bar-Pl4 mm rolled products. The effect of 0. 03% - 1.10% Si and 1 010 1 070 ℃ quenching ＋ 510 - 550 ℃ tempering treatment on metallurgical quality, structure and mechanical properties of steel 5CrSWMoSiV has been studied. Resuhs show that the Si is obvious to promote the precipitation of carbides in steel and markedly to increase the hardness of steel; in steels containing 0. 3 %, 0. 7% and 1.1% Si, the toughness and strength of 0. 7% Si steel are lowest, but the toughness and bending strength of 0. 3% Si steel is highest; the HRC hamess value of 1.1% Si steel quenched at 1 060 - 1 080 ℃ is up to 64. As service for cold-rolling mill middle roll, the suitable Si content in steel 5CrSWMoSiV is 1.0% - 1.2% , the recommended heat treatment process for steel 5CrSWMoSiV is quenching at 1 030 - 1 070 ℃ and tempering at 520 - 540 ℃.

关 键 词：5CrSWMoSiV钢 si碳化物 硬度 冲击韧性 强度 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]