摘要:
Age hardenable steel is low in hardness after hot forging, providing a machine part with the desired fatigue strength and yield strength by aging treatment, and high in toughness after aging treatment, comprising C: 0.09 to 0.20%, Si: 0.01 to 0.40%, Mn: 1.5 to 2.5%, S: 0.001 to 0.045%, Cr: over 1.00% to 2.00%, Al: 0.001 to 0.060%, V: 0.22 to 0.55%, N: over 0.0080 to 0.0170%, and a balance of Fe and impurities, where an area rate of bainite structures is 80% or more, an effective V ratio (amount of dissolved V/total amount of V) is 0.9 or more, a P and Ti in the impurities is P: 0.03% or less and Ti: less than 0.005%, and the chemical composition is one where the following F1 is 1.00 or less and the F2 is 0.30 or more: F 1 = C + 0.1 × Si + 0.2 × Mn + 0.15 × Cr + 0.35 × V F 2 = − 4.5 × C + Mn + Cr − 3.5 × V
摘要:
A rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, and N: 0.005-0.030%, and the balance of Fe and impurities, the contents of P and O in the impurities being P: 0.035% or less and O: 0.0030% or less, and value represented by Fn1 = C + Si/10 + Mn/5 + 5Cr/22 + 1.65V - 5S/7 being 0.90 to 1.20, wherein the predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R 1 /2 part of a longitudinal cross section of the rolled steel bar as W (µm) is 99.99% is 100 µm or narrower; and the number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 µm observed per unit area of the R 1 /2 part of a transverse cross section of the rolled steel bar is 500 pieces/mm 2 or higher; where, the symbol of an element in Formula (i) represents the content (mass%) of the element.
摘要翻译:甲轧制棒钢热锻由......组成,以质量%计,C的:0:25至12:50%以下,Si:0.40-1.0%以下,Mn:1.0-1.6%,S:0005-0035%以下,Al:0005-0050%,V :0:10至12:30%,N:从0005至0030%,和Fe和杂质的平衡,P和O中的杂质的含量为P:0.035%以下和O:0.0030%以下,和值由代表 FN1 = C +的Si / 10 +的Mn / 5 + 5CR / 22 + 1.65V - 5S / 7为0.90〜1.20,worin非金属夹杂物的预测最大宽度在时间当累积分布函数所获得由极值统计处理 以非金属夹杂物的宽度在轧制棒钢作为W(微米)的纵向横截面的A R 1/2的部分是99.99%为100微米或更窄; 和具有每轧制棒钢的一个横截面中的R 1/2部分的单位面积的观察0.3〜1.0微米的当量圆直径的每个硫化物的数密度为500个/ mm 2或更高; 其中,元件的在通式(i)的符号darstellt的元素的含量(质量%)。
摘要:
Provided is a rail vehicle axle having an excellent fatigue limit and notch factor. A rail vehicle axle according to the present embodiment has a chemical composition consisting of, in mass%, C: 0.20 to 0.35%, Si: 0.20 to 0.65%, Mn: 0.40 to 1.20%, P: 0.020% or less, S: 0.020% or less, Cu: 0 to 0.30%, Ni: 0 to 0.30%, Cr: 0 to 0.30%, Mo: 0 to 0.08%, Al: 0 to 0.100%, N: 0.0200% or less, V: 0 to 0.060%, and Ti: 0 to 0.020%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2): 0.58 ≤ C + Si / 8 + Mn / 5 + Cu / 10 + Cr / 4 + V ≤ 0.67 Si + 0.9 Cr ≥ 0.50 where, each element symbol in Formulae (1) and (2) is substituted by the content (mass%) of a corresponding element.
摘要翻译:提供具有优异的疲劳极限和缺口因数的轨道车辆车轴。 根据本实施方式的轨道车辆轴具有质量%C:0.20〜0.35%,Si:0.20〜0.65%,Mn:0.40〜1.20%,P:0.020%以下的化学成分,S: 0.020%以下,Cu:0〜0.30%,Ni:0〜0.30%,Cr:0〜0.30%,Mo:0〜0.08%,Al:0〜0.100%,N:0.0200% 至0.060%,Ti:0〜0.020%,余量为Fe和杂质,满足式(1)和(2):0.58‰C + Si / 8 + Mn / 5 + Cu / 10 + Cr / 4 + V‰0.67 Si + 0.9 Cr‰¥0.50其中,式(1)和(2)中的每个元素符号由相应元素的含量(质量%)代替。
摘要:
An age-hardenable steel having a chemical composition consisting of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: more than 0.50% and not more than 1.6%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, with the balance being Fe and impurities, wherein within the impurities, P ≤ 0.03%, Ti
摘要:
An age-hardenable steel having a chemical composition consisting of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: 0.03 to 0.50%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, with the balance being Fe and impurities, wherein within the impurities, P ≤ 0.03%, Ti
摘要:
A rolled steel bar for hot forging having a chemical composition consisting, by mass percent, of C: 0.27 to 0.37%, Si: 0.30 to 0.75%, Mn: 1.00 to 1.45%, S: 0.008% or more and less than 0.030%, Cr: 0.05 to 0.30%, Al: 0.005 to 0.050%, V: 0.200 to 0.320%, and N: 0.0080 to 0.0200%, the balance being Fe and impurities, wherein the contents of P, Ti and O in the impurities are, by mass percent, P: 0.030% or less, Ti: 0.0040% or less, and O: 0.0020% or less; and Y1 expressed by the following formula is 1.05 to 1.18.
where, C, Si, Mn, Cr, V, and S in the above formula represent, respectively, the content by mass percent of each of the elements. A hot-forged part having a tensile strength of 900 MPa or higher and a transverse endurance ratio of 0.47 or higher after hot forging can be obtained by the rolled steel bar.
摘要:
An age-hardenable steel having a chemical composition consisting of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: 0.03 to 0.50%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, with the balance being Fe and impurities, wherein within the impurities, P ‰¤ 0.03%, Ti
摘要:
A steel pipe for fuel injection pipe has a chemical composition consisting, by mass percent, of, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, Mn: 0.3 to 2.0%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, Ti: 0.005 to 0.015%, Nb: 0.015 to 0.045%, Cr: 0 to 1.0%, Mo: 0 to 1.0%, Cu: 0 to 0.5%, Ni: 0 to 0.5%, V: 0 to 0.15%, and B: 0 to 0.005%, the balance being Fe and impurities, and the contents of Ca, P, S, and O in the impurities being Ca: 0.001% or less, P: 0.02% or less, S: 0.01% or less, and O: 0.0040% or less, and has a metal micro-structure consisting of a tempered martensitic structure, or a mixed structure of tempered martensite and tempered bainite, in which a prior-austenite grain size number is 10.0 or more, wherein the steel pipe has a tensile strength TS 800 MPa or higher, and a critical internal pressure is [0.3 × TS × α] or more, wherein α = [(D/d) 2 -1]/[0.776 × (D/d) 2 ], D: steel pipe outer diameter (mm), and d: steel pipe inner diameter (mm).