摘要:
High-quality high-speed steel roll which is markedly excellent in abrasion resistance and free of carbide segregation even in the case of production by centrifugal casting of economical benefit; it comprises an outer layer containing, by all weight ratios, C; 2.4-2.9%, Si; not more than 1%, Mn; not more than 1%, Cr; 12-18%, Mo; 3-9%, V; 3-8% and Nb; 0.5-4%, and meeting with the following equations (1) and (2) at one time,0.27.gtoreq.Mo (%)/Cr (%).ltoreq.0.7 (1)C (%)+0.2.multidot.Cr (%).ltoreq.6.2 (2)the outer layer further containing as the balance Fe and unavoidable impurities.
摘要:
A centrifugal cast roll shell material composed of a granular MC carbide, graphite and C: 2.5 to 4.7%, Si: 0.8 to 3.2%, Mn: 0.1 to 2.0%, Cr: 0.4 to 1.9%, Mo: 0.6 to 5%, V: 3.0 to 10.0% and Nb: 0.6 to 7.0%, satisfying the following formulae (1), (2), (3) and (4): 2.0+0.715 V+0.10 Nb.ltoreq.C (%) (1) 1.1.ltoreq.Mo/Cr (2) Nb/V.ltoreq.0.8 (3) 0.2.ltoreq.Nb/V (4), the remainder being Fe and inevitable impurities, wherein the pouring temperature is 1,400.degree. C. or higher.
摘要翻译:PCT No.PCT / JP96 / 00544 Sec。 371日期1996年10月29日第 102(e)日期1996年10月29日PCT 1996年3月6日PCT公布。 公开号WO96 / 27688 日期1996年9月12日由粒状MC碳化物,石墨和C:2.5〜4.7%,Si:0.8〜3.2%,Mn:0.1〜2.0%,Cr:0.4〜1.9%,Mo: 0.6〜5%,V:3.0〜10.0%,Nb:0.6〜7.0%,满足下式(1),(2),(3)和(4):2.0 + 0.715 V + 0.10 Nb < (%)(1)1.1 = Mo / Cr(2)Nb / V <= 0.8(3)0.2 Nb / V(4),其余为Fe和不可避免的杂质,其中浇注温度 1400℃以上。
摘要:
A roll outer layer material for hot rolling includes, as analyzed in weight percent, of 2.5-4.0% C, 6.0-20% Cr, 3.0-10.0% V, 0.6-5.0% Nb, 2.0-15% Mo, 3.0% or below Si, 3.0% or below Mn, C, V, Nb and Cr satisfying a following formula (1), 10.5(%).ltoreq.6.5.C(%)-1.3.V(%)-0.7.Nb(%).ltoreq.2.Cr(%)-2(%)(1) , and the balance being Fe and incidental impurities. A method of manufacturing a roll for hot rolling includes the steps of centrifugally casting an outer layer material having the above composition, centrifugally casting graphite steel containing 0.5% or above of C as an intermediate layer, and casting an axis material which is a spheroidal graphite cast iron, a flake graphite cast iron or a graphite steel. C is present in the intermediate layer in an amount which satisfies a following formula (2), C (intermediate layer).gtoreq.2.0-0.5 (C-0.2 V-0.11 Nb)(outer layer)(2)
摘要:
A roll outer layer material for hot rolling consists essentially, as analyzed in weight percent, of 2.5-4.0% C, 6.0-20% Cr, 3.0-10.0% V, 0.6-5.0% Nb, 2.0-15% Mo, 3.0% or below Si, 3.0% or below Mn, C, V, Nb and Cr satisfying a formula where 10.5.ltoreq.6.5.C(%)--1.3.V(%)--0.7.Nb(%).ltoreq.2.Cr(%)--2, and the balance being Fe and incidental impurities. A method of manufacturing a roll for hot rolling comprises the steps of centrifugally casting an outer layer material having the above composition, centrifugally casting graphite steel containing 0.5% or above of C as an intermediate layer, and casting an axis material which is a spheroidal graphite cast iron, a flake graphite cast iron or a graphite steel. Carbon is present in the intermediate layer in an amount which satisfies a formula, C (intermediate layer).gtoreq.2.0-0.5�C(%)--0.2.V(%)--0.11.Nb(%)! (outer layer).