摘要:
A cold rolled steel sheet according to the present invention satisfies an expression of (5 × [Si] + [Mn]) / [C] > 11 when [C] represents an amount of C by mass%, [Si] represents an amount of Si by mass%, and [Mn] represents an amount of Mn by mass%, a metallographic structure before hot stamping includes 40% to 90% of a ferrite and 10% to 60% of a martensite in an area fraction, a total of an area fraction of the ferrite and an area fraction of the martensite is 60% or more, a hardness of the martensite measured with a nanoindenter satisfies an H2 / H1
摘要:
A hot stamped article has a component composition containing, in terms of % by mass, 0.002% to 0.1% of C, 0.01% to 0.5% of Si, 0.5% to 2.5% of Mn+Cr, 0.1% or less of P, 0.01% or less of S, 0.05% or less of t-Al, 0.005% or less ofN, and 0.0005% to 0.004% of B which is optionally contained in a case where the Mn+Cr is 1.0% or more, the remainder being Fe and unavoidable impurities. The hot stamped article has a microstructure composed of, in terms of an area ratio, 0% or more and less than 90% of martensite, 10% to 100% of bainite, and less than 0.5% of unavoidable inclusion structures, or a microstructure composed of, in terms of an area ratio, 99.5% to 100% of bainitic ferrite, and less than 0.5% of unavoidable inclusion structures.
摘要:
A high-strength steel sheet includes: 0.03 to 0.20% of C, 0.08 to 1.5% of Si, 0.5 to 3.0% of Mn, 0.05% or less of P, 0.0005% or more of S, 0.008 to 0.20% of acid-soluble Ti, 0.0005 to 0.01 % ofN, more than 0.01% of acid-soluble Al, and 0.001 to 0.04% of one or both of Ce and La in terms of mass%; and the balance including Fe and inevitable impurities. The ratio of (Ce+La)/acid-soluble Al is equal to or more than 0.1 and the ratio of (Ce+La)/S is in the range of 0.4 to 50 in a mass base, and the density of the number of inclusions, having a circle equivalent diameter of 2 µm or less, which are present in the steel sheet is equal to or more than 15/mm 2 .
摘要翻译:的高强度钢板包括:C:0.03〜0.20%以下,Si:0.08〜1.5%,Mn为0.5〜3.0%,0.05%或更少的P,0.0005%以上的S,0.008至酸的0.20% 可溶的Ti,0.0005〜0.01%至OFN,人数超过00:01酸可溶性Al的%,和0.001%至0.04%的一个或以质量%计两者Ce和La中的; 和其余为Fe和不可避免的包括杂质。 (铈+ La)的比率/酸可溶性Al是等于或大于0.1和(铈+ La)的比率/ S为0.4〜50的质量基的范围内,并且数密度 夹杂物中,具有2微米或更小,这是存在于钢板中的当量圆直径等于或大于15个/ mm 2。
摘要:
A hot stamped steel according to the present invention satisfies an expression of (5 × [Si] + [Mn]) / [C] > 11 when [C] represents an amount of C by mass%, [Si] represents an amount of Si by mass%, and [Mn] represents an amount of Mn by mass%, a metallographic structure after hot stamping includes 40% to 90% of a ferrite and 10% to 60% of a martensite in an area fraction, a total of an area fraction of the ferrite and an area fraction of the martensite is 60% or more, a hardness of the martensite measured with a nanoindenter satisfies an H2/H1
摘要:
When the amount of C, the amount of Si and the amount of Mn are respectively represented by [C], [Si] and [Mn] in unit mass%, the cold rolled steel sheet satisfies a relationship of (5×[Si]+[Mn])/[C]>10, the metallographic structure contains, by area ratio, 40% to 90% of a ferrite and 10% to 60% of a martensite, further contains one or more of 10% or less of a pearlite by area ratio, 5% or less of a retained austenite by volume ratio and 20% or less of a bainite by area ratio, the hardness of the martensite measured using a nanoindenter satisfies H20/H10
标题翻译:HEISSGESTANZTERFORMKÖRPER,VERFAHREN ZUR HERSTELLUNG EINES STAHLBLECHS ZUR HEISSSTANZUNG UND VERFAHREN ZUR HERSTELLUNG EINES HEISSGESTANZTEN FORMARTIKELS
摘要:
A hot-stamped steel according to the present invention includes, by mass%, C: 0.20% to 0.3 5%, Si: 0.1% to 0.5%, the total of at least one selected from Mn and Cr: 1% to 3%, Al: 0.005% to 0.06%, Ti: 0.002% to 0.1 %, Nb: 0.002% to 0.1 1 %, O: 0.003% to 0.007%, and a balance of iron and inevitable impurities, wherein P is limited to 0.015% or less, S is limited to 0.01% or less, N is limited to 0.004% or less, the dimensional ratio of the lengths of prior austenite grains in a rolling direction to the lengths of the prior austenite grains in the sheet thickness direction is 1.3 to 2.5, the average grain size of the prior austenite grains is 6 µm or less, the microstructure includes 98% or more of martensite, and the tensile strength is 1470 MPa or more.
摘要:
Provided is a surface layer grain refining hot-shearing method including: heating and keeping a steel sheet in a temperature range of from Ac3 to 1400°C to austenitize the steel sheet; subsequently shearing the steel sheet in a state in which the steel sheet is placed on a die; and quenching by rapidly cooling the sheared steel sheet, wherein a start temperature of the shearing is set to be a temperature (°C) obtained by adding a temperature of from 30°C to 140°C to a previously measured Ar3 of the steel sheet.
摘要:
A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an Average A1 concentration of a weld metal in the welded portion is in a range of 0.3 mass% to 1.5 mass%, an Ac 3 point of the weld metal is 1250°C or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion.