摘要:
An electron-beam welded joint including, by mass %, C: 0.02% to 0.1%, Si: 0.03% to 0.30%, Mn: 1.5% to 2.5%, Ti: 0.005 to 0.015%, N: 0.0020 to 0.0060%, O: 0.0010% to 0.0035%, Nb: 0% to 0.020%, V: 0% to 0.030%, Cr: 0% to 0.50%, Mo: 0% to 0.50%, Cu: 0% to 0.25%, Ni: 0% to 0.50%, B: 0% to 0.0030%, S: limited to 0.010% or less, P: limited to 0.015% or less, Al: limited to 0.004% or less, and a balance consisting of iron and unavoidable impurities, wherein an index value CeEB is 0.49% to 0.60%, a number of oxides having an equivalent circle diameter of 1.0 μm or more is 20 pieces/mm2 or less, and a number of oxides having an equivalent circle diameter of 0.05 μm or more and less than 0.5 μm is 1×103 pieces/mm2 to 1×105 pieces/mm2 at a thickness center portion.
摘要翻译:1.一种电子束焊接接头,以质量%计含有C:0.02〜0.1%,Si:0.03〜0.30%,Mn:1.5〜2.5%,Ti:0.005〜0.015%,N:0.0020〜0.0060% O:0.0010〜0.0035%,Nb:0〜0.020%,V:0%〜0.030%,Cr:0〜0.50%,Mo:0〜0.50%,Cu:0〜0.25% 0%〜0.50%,B:0%〜0.0030%,S:限制在0.010%以下,P:0.015%以下,Al:0.004%以下,余量由铁和不可避免的杂质 其中,指数值CeEB为0.49〜0.60%,当量圆直径为1.0μm以上的氧化物数为20个/ mm 2以下,当量圆直径为0.05μm以上的氧化物数 在厚度中心部分,小于0.5μm为1×103个/ mm 2〜1×105个/ mm 2。
摘要:
The present invention provides steel plate for line pipe excellent in strength and ductility and a method of production of the same. The steel plate has a steel composition containing, by mass %, C: 0.04 to 0.15%, Si: 0.05 to 0.60%, Mn: 0.80 to 1.80%, P: 0.020% or less, S: 0.010% or less, Nb: 0.01 to 0.08%, and Al: 0.003 to 0.08%, having a balance of iron and unavoidable impurities, and having a value of Ceq shown by the following formula of 0.48 or less, comprised of a mixed structure of ferrite and pearlite or ferrite and pearlite partially containing bainite in which a ferrite percentage is 60 to 95%, having a yield strength of 450 MPa or more, and having an amount of hydrogen contained in the steel of 0.1 ppm or less: Ceq=C+Mn/6+(Cu+Ni)/15+(Cr+Mo+Nb+V+Ti)/5+5B
摘要翻译:本发明提供强度和延展性优异的管线用钢板及其制造方法。 该钢板的组成为:以质量%计含有C:0.04〜0.15%,Si:0.05〜0.60%,Mn:0.80〜1.80%,P:0.020%以下,S:0.010%以下,Nb: 0.01〜0.08%,Al:0.003〜0.08%,余量由铁和不可避免的杂质构成,并且由铁氧体和珠光体的混合结构构成的下述通式1所示的Ceq值为0.48以下 或部分含有铁素体百分比为60〜95%的贝氏体的铁素体和珠光体,屈服强度为450MPa以上,钢中含有的氢的量为0.1ppm以下:Ceq = C + Mn / 6+(Cu + Ni)/ 15 +(Cr + Mo + Nb + V + Ti)/ 5 + 5B 1
摘要:
By heating a steel material comprising C: 0.003 to 0.05%, Si: 0.60% or less, Mn: 0.6 to 2.0%, P: 0.020% or less, S: 0.010% or less, Cr: 0.20 to 1.5%, Nb: 0.005 to 0.05%, Al: 0.060% or less, and N: 0.001 to 0.006%, further limiting, as an impurity, Mo to 0.03% or less, having a balance of iron and unavoidable impurities, and having a weld cracking parameter PCM value defined by PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B of 0.22% or less, to 1000 to 1300° C. in temperature, finishing the hot rolling at 800° C. or more in temperature, then cooling, steel for welded structures excellent in high temperature strength and low temperature toughness can be inexpensively provided.
摘要翻译:通过加热C:0.003〜0.05%,Si:0.60%以下,Mn:0.6〜2.0%,P:0.020%以下,S:0.010%以下,Cr:0.20〜1.5%,Nb: 0.005〜0.05%,Al:0.060%以下,N:0.001〜0.006%,进一步限制,作为杂质,Mo为0.03%以下,余量为铁和不可避免的杂质,具有焊接裂纹参数PCM 由PCM = C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B定义为0.22%以下的值为1000〜1300℃ 温度在800℃以上的温度下进行热轧,然后冷却,可以廉价地提供高温强度和低温韧性优异的焊接结构用钢。
摘要:
The present invention relates to a high-tensile-strength low alloy carbon steel (in the form of a steel sheet, a steel pipe, a section steel or a wire rod), for a building structure, said high-tensile-strength steel being excellent in high temperature strength during a relatively short span of about one hour in the temperature from 600° C. to 800° C. and being used in the field of building construction, civil engineering, an offshore structure, shipbuilding, a reservoir tank or the like; and, more specifically, is a high-tensile-strength steel excellent in high temperature strength, characterized by containing, in mass, C at not less than 0.005% to less than 0.08%, Si at not more than 0.5%, Mn at 0.1 to 1.6%, P at not more than 0.02%, S at not more than 0.01%, Mo at 0.1 to 1.5%, Nb at 0.03 to 0.3%, Ti at not more than 0.025%, B at 0.0005 to 0.003%, Al at not more than 0.06%, and N at not more than 0.006%, with the balance consisting of Fe and unavoidable impurities and satisfying the expression p≧−0.0029×T+2.48 when the steel temperature T (° C.) is within the range from 600° C. to 800° C., wherein p is a stress drop ratio (a yield stress at a high temperature/a yield stress at room temperature) that is obtained by converting a yield stress normalized by using a yield stress at room temperature.
摘要:
The present invention provides steel plate for line pipe excellent in strength and ductility and a method of production of the same. The steel plate has a steel composition containing, by mass %, C: 0.04 to 0.15%, Si: 0.05 to 0.60%, Mn: 0.80 to 1.80%, P: 0.020% or less, S: 0.010% or less, Nb: 0.01 to 0.08%, and Al: 0.003 to 0.08%, having a balance of iron and unavoidable impurities, and having a value of Ceq shown by the following formula of 0.48 or less, comprised of a mixed structure of ferrite and pearlite or ferrite and pearlite partially containing bainite in which a ferrite percentage is 60 to 95%, having a yield strength of 450 MPa or more, and having an amount of hydrogen contained in the steel of 0.1 ppm or less: Ceq=C+Mn/6+(Cu+Ni)/15+(Cr+Mo+Nb+V+Ti)/5+5B .
摘要翻译:本发明提供强度和延展性优异的管线用钢板及其制造方法。 该钢板的组成为:以质量%计含有C:0.04〜0.15%,Si:0.05〜0.60%,Mn:0.80〜1.80%,P:0.020%以下,S:0.010%以下,Nb: 0.01〜0.08%,Al:0.003〜0.08%,余量由铁和不可避免的杂质构成,并且由铁氧体和珠光体的混合结构构成的下述通式1所示的Ceq值为0.48以下 或部分含有铁素体百分比为60〜95%的贝氏体的铁素体和珠光体,屈服强度为450MPa以上,钢中含有的氢的量为0.1ppm以下:Ceq = C + Mn / 6+(Cu + Ni)/ 15 +(Cr + Mo + Nb + V + Ti)/ 5 + 5B 1。
摘要:
The present invention provides a high-strength steel for welded structures excellent in strength at a high temperature of a temperature range of 600° C. to 800° C. and a method of production of the same, in particular 490 MPa class high-strength steel for welded structures excellent in high temperature strength containing C: 0.005% to less than 0.040%, Si: 0.5% or less, Mn: 0.1 to less than 0.5%, P:0.02% or less, S: 0.01% or less, Mo: 0.3 to 1.5%, Nb: 0.03 to 0.15%, Al: 0.06% or less, and N: 0.006% or less and in accordance with need one or more of Cu, Ni, Cr, V, Ti, Ca, REM, and Mg, having a weld crack susceptible formulation PCM defined as PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B of 0.15% or less, substantially not containing B, and a remainder Fe and unavoidable impurities, the microstructure being mainly composed of a mixed structure of ferrite and bainite, and the fraction of bainite being 20 to 90%.
摘要翻译:本发明提供一种在600℃〜800℃的高温下的强度优异的焊接结构体的高强度钢及其制造方法,特别是490MPa级的高强度 含有C:0.005〜小于0.040%,Si:0.5%以下,Mn:0.1〜小于0.5%,P:0.02%以下,S:0.01%以下的高温强度优异的焊接结构用钢, Mo:0.3〜1.5%,Nb:0.03〜0.15%,Al:0.06%以下,N:0.006%以下,根据需要Cu,Ni,Cr,V,Ti,Ca,REM, ,和具有焊接裂纹易受影响的制剂P< CM>定义为P CM + C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B为0.15%以下,基本不含B,余量为Fe和不可避免的杂质,微观结构主要由铁素体和贝氏体组成,贝氏体组分 为20〜90%。
摘要:
In order to quickly and economically evaluate cleanliness of a metal with high representativity when quantities, compositions, etc., of non-metallic inclusion particles existing in a metal and resulting in product defects are evaluated by a sample collected during the production process of the metal, the present invention provides an evaluation method involving the steps of levitation-melting a metal piece for a predetermined time by cold crucible levitation-melting means, discharging non-metallic inclusion particles contained in the metal piece to the surface of a molten metal, and directly analyzing a curved and non-smooth sample surface after solidification by a fluorescent X-ray analysis method using an energy dispersion type spectroscope, or by other chemical or physical measurements, to measure or analyze the quantities of elements constituting the non-metallic inclusion particles and to determine quantity of the non-metallic inclusions.
摘要:
A steel having excellent HAZ toughness can be used for ships, buildings, pressure containers, linepipes, and so forth. The steel is of a Ti--Mg--O system steel containing at least 40 pcs/mm.sup.2 of oxide and composite oxide particles of Ti and Mg having a size of 0.001 to 5.0 .mu.m. A steel having excellent HAZ toughness can be produced, and the safety of structures using this steel can be remarkably improved.
摘要:
A Ti--Al intermetallic compound has a compressibility of at least 25% at room temperature and a superior high temperature oxidation resistance and consists essentially of about 40 to 52 atomic percent of Ti, about 48 to 60 atomic percent of Al, and 10 to 1000 atomic ppm of at least one of P, As, Se, or Te.
摘要:
The present invention provides a common rail formed by bonding a common rail body and a common rail holder which has a pressing surface and a convex bonding surface, by means of a heat pressure bonding process and a liquid phase diffusion bonding process, wherein the height H of the convex bonding surface satisfies 1 μm≦H≦50 μm, and the common rail holder includes a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than the area of the pressing surface.