摘要:
A method of producing a fluxing agent that can be used in production of steel, preferably stainless steel, employs as a raw material a hydroxide sludge that results from neutralization of metal-contaminated pickling liquid from a pickling step for a steel and contains at least one fluoride-containing compound. The hydroxide sludge is calcined. Steel, preferably stainless steel, is produced by decarburizing a steel heat, whereby a slag is formed on top of the steel heat, and adding a fluxing agent to the slag.
摘要:
A method and composition for removing sulfur from molten ferrous material, particularly molten iron. The desulfurization agent includes one or more pucks or briquettes of deoxidizing and/or desulfurization agent. The pucks or briquettes of deoxidizing and/or desulfurization agent include at least one deoxidizing metal and at least one ferrous metal.
摘要:
The present invention relates to a high-cleanliness steel having a high fatigue strength and high cold workability, and a method of making the high-cleanliness steel. The method adds a Li—Si alloy having a Li content between 20 and 40% and/or Li2CO3 as a Li-containing substance to a molten steel. The Li-containing substance is added to the molten steel after the completion of a series of steps of a ladle refining process including composition adjustment, temperature adjustment and slag refining. The high-cleanliness steel has a total-Li content between 0.020 and 20 ppm by mass and contains 1.0 or below oxide inclusion particle having a major diameter of 20 μm or above at a maximum in 50 g of the steel wire. The steel contains an oxide inclusion that has a CaO content between 15 and 55%, SiO2 content between 20 and 70%, an Al2O3 content of 35% or below, a MgO content of 20% or below and a Li2O content between 0.5 and 20%. The high-cleanliness steel has improved fatigue characteristics and improved cold workability.
摘要翻译:本发明涉及具有高疲劳强度和高冷加工性的高清洁度钢以及制造高清洁度钢的方法。 该方法将Li含量为20-40%的Li-Si合金和/或Li 2 CO 3 3作为含Li物质添加到钢水中。 在包括组合物调节,温度调节和炉渣精炼的钢包精炼过程的一系列步骤完成之后,将含Li物质添加到钢水中。 高洁净度钢的总Li含量在0.020〜20ppm质量之间,并且在50g的钢丝中最多含有1.0或更小的直径为20μm以上的氧化物夹杂物。 钢含有CaO含量为15〜55%,SiO 2含量为20〜70%,Al 2 O 3 O 3的氧化物夹杂物, 含量为35%以下,MgO含量为20%以下,Li 2 O 3 O含量为0.5%〜20%。 高清洁度钢具有改善的疲劳特性和改善的冷加工性能。
摘要:
The present invention relates to a high-cleanliness steel having a high fatigue strength and high cold workability, and a method of making the high-cleanliness steel. The method adds a Li—Si alloy having a Li content between 20 and 40% and/or Li2CO3 as a Li-containing substance to a molten steel. The Li-containing substance is added to the molten steel after the completion of a series of steps of a ladle refining process including composition adjustment, temperature adjustment and slag refining. The high-cleanliness steel has a total-Li content between 0.020 and 20 ppm by mass and contains 1.0 or below oxide inclusion particle having a major diameter of 20 μm or above at a maximum in 50 g of the steel wire. The steel contains an oxide inclusion that has a CaO content between 15 and 55%, SiO2 content between 20 and 70%, an Al2O3 content of 35% or below, a MgO content of 20% or below and a Li2O content between 0.5 and 20%. The high-cleanliness steel has improved fatigue characteristics and improved cold workability.
摘要翻译:本发明涉及具有高疲劳强度和高冷加工性的高清洁度钢以及制造高清洁度钢的方法。 该方法将Li含量为20-40%的Li-Si合金和/或Li 2 CO 3 3作为含Li物质添加到钢水中。 在包括组合物调节,温度调节和炉渣精炼的钢包精炼过程的一系列步骤完成之后,将含Li物质添加到钢水中。 高洁净度钢的总Li含量在0.020〜20ppm质量之间,并且在50g的钢丝中最多含有1.0或更小的直径为20μm以上的氧化物夹杂物。 钢含有CaO含量为15〜55%,SiO 2含量为20〜70%,Al 2 O 3 O 3的氧化物夹杂物, 含量为35%以下,MgO含量为20%以下,Li 2 O 3 O含量为0.5%〜20%。 高清洁度钢具有改善的疲劳特性和改善的冷加工性能。
摘要:
A welding structural steel product exhibiting a superior heat affected zone toughness, comprising, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.5% Si, 0.4 to 2.0% Mn, 0.005 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01% B, 0.001 to 0.2% W, at most 0.03% P, at most 0.03% S, at most 0.005% O, and balance Fe and incidental impurities while satisfying conditions of 1.2≦Ti/N≦2.5, 10≦N/B≦40, 2.5≦Al/N≦7, and 6.5≦(Ti+2Al+4B)/N≦14, and having a microstructure essentially consisting of a complex structure of ferrite and pearlite having a grain size of 20 μm or less. The method includes the steps of preparing a slab of the above-described composition, heating the slab to 1,100° C. to 1,250° C. for 60-180 minutes, hot rolling the heated slab in an austenite recrystallization range at a 40% or more rolling reduction followed by controlled cooling.
摘要翻译:表现出优异的热影响区韧性的焊接结构钢产品,以重量%计含有0.03〜0.17%的C,0.01〜0.5%的Si,0.4〜2.0%的Mn,0.005〜0.2%的Ti,0.0005〜0.1% Al,0.008〜0.030%N,0.0003〜0.01%B,0.001〜0.2%W,0.03%以下P,0.03%以下S,0.005%以下O,余量Fe及杂质, = Ti / N <=2.5,10≤N/B≤40,2.5≤Al/N≤7和6.5 <=(Ti + 2Al + 4B)/N≤14,并且具有微观结构 由粒径为20μm以下的铁素体和珠光体的复合结构构成。 该方法包括以下步骤:制备上述组合物的板坯,将板坯加热至1100℃至1250℃,持续60-180分钟,在奥氏体重结晶范围内以40%的速度热轧加热的板坯,或 更多的轧制减少,然后控制冷却。
摘要:
A process and an apparatus for removal of silicon, manganese, carbon and sulphur in a single reaction vessel from molten high carbon ferrous metal by conducting the highly reducing and highly oxidizing reactions at two different locations within the same reaction vessel. The removal of sulphur is effected at the bottom of the vessel, whereas the removal of manganese silicon and carbon is effected at the top layer of the molten layer of the molten metal where slag is present.
摘要:
The present invention relates to a molten steel refining method for refining molten steel, the carbon content of which is not more than 0.1 weight %, by blowing oxygen gas for decarburization at a blowing speed so that a cavity, the depth of which is 150 to 400 mm, can be formed on the surface of molten steel in a straight barrel type vacuum refining apparatus in which a straight barrel type vacuum vessel having no vessel bottom and a ladle are arranged. When necessary, the above decarburizing processing conducted by blowing oxygen gas is combined with: an Al heating process in which Al added into the vacuum vessel is burned by oxygen gas blown into the vacuum vessel at a blowing speed such that the cavity depth can be 50 to 400 mm; a degassing treatment conducted in a high vacuum condition; a desulfurizing treatment in which a desulfurizing agent is blown into the vacuum vessel; or a burner heating treatment in which a combustion improving agent is blown together with oxygen gas, wherein each treatment except for the high vacuum degassing treatment is conducted in a degree of vacuum of 100 to 400 Torr.
摘要:
A carbon steel containing super-finely dispersed oxide system inclusions, comprising, by weight, not more than 1.2% carbon, 0.01 to 0.10% Al, total oxygen of not more than 0.0050%, Mg which fulfills the relationship of the following formula: (total oxygen wt %.times.0.5).ltoreq.total Mg wt %
摘要翻译:PCT No.PCT / JP94 / 00230 Sec。 371日期:1995年4月14日 102(e)日期1995年4月14日PCT 1994年2月16日PCT PCT。 WO95 / 05492 PCT出版物 日期:1995年2月23日含有超细分散氧化物系夹杂物的碳素钢,其含有不超过1.2%的碳,0.01〜0.10%的Al,总氧不超过0.0050%,满足关系的Mg 总氧含量(重量%x0.5)<总氧化镁重量%<(总氧气重量%×7.0)和包含MgO x Al 2 O 3和游离MgO的Mg氧化物。
摘要:
A process for obtaining Ni units from sulfur-bearing nickel concentrate during refining a nickel-alloyed steel or a stainless steel. Sulfur of the concentrate is transferred to and held within the slag by controlling slag composition and temperature, degree of mixing of the slag with the bath by an inert gas and aluminum level in the bath. The extent of desulfurization by the slag, the slag weight and the steel sulfur specification determine the amount of concentrate that can be added to the bath. The ratio of the slag weight to the iron bath weight should be in the range of 0.10-0.30 and the bath temperature is maintained between 1550.degree.-1700.degree. C. The slag basicity is controlled between 1.0 and 3.5, the composition of Al.sub.2 O.sub.3 in the slag is maintained between 15-25 wt. % and the composition of MgO is maintained between 12-20 wt. %.
摘要:
A method for metallothermally reheating a liquid steel bath in a metallurgical container into which a metal fuel is placed and oxidizing and agitating gases are injected under its surface. A controllable flow resulting from the injection of agitating gas is generated in the bath by means of a device which is separate from the oxidizing gas injection device, and the metal fuel is inserted into said flow so that it comes into contact with said oxidizing gas.