41results about How to "Low content of alloying elements" patented technology

A non-Co multi-element high-speed tool steel contains proportionally C, Si, Mn, S, P, Cr, V, Mo, W, Ni, Nb, Ti, Mg, RE and Fe. Its preparing process includes such steps as smelting by MF furnace, modifying with Y-based RE alloy, centrifugal casting, and heat treating.

The present invention discloses one kind of new high carbon and high tungsten high speed steel roll and its making process, and belongs to the field of high speed steel roll making technology. The high carbon and high tungsten high speed steel roll contains C 2.0-3.0 wt%, W 6.0-18.0 wt%, V 2.0-4.0 wt%, Mo 1.0-3.0 wt%, Cr 3.0-9.0 wt%, Si less than 1.2 wt%, and Mn less than 1.2 wt%, and possesses MC type composite carbide of V and W. The making process of the high carbon and high tungsten high speed steel roll includes heating high carbon and high tungsten high speed steel to 1580-1620 deg.c before deoxidizing, casting at 1400-1500 deg.c and rotary forming while adding stable magnetic field of 0.05-0.25 T to the centrifuging casting mold and rotating the casting mold at 600-1800 rpm speed.

The invention discloses a cooling-after-rolling method of high-weather resistance hot-rolling H-shaped steel with yield strength of 500MPa. The high-weather resistance hot-rolling H-shaped steel with yield strength of 500MPa comprises the following components in percentage by mass: 0.06-0.12% of C, 0.30-0.60% of Si, 0.80-1.20% of Mn, 0.010-0.030% of P, 0.001-0.015% of S, 0.20-0.35% of Cu, 0.20-0.40% of Cr, 0.15-0.30% of Ni, 0.040-0.060% of Nb, 0.003-0.030% of Als, and the balance of iron and residual trace impurities. The H-shaped steel rolling technology comprises the steps of: heating with a casting blank heating furnace, rolling with a cogging mill, rolling with a universal mill and two-segment quick cooling after the rolling. In the invention, by adopting a two-segment quick cooling method after the hot rolling of the H-shaped steel and by use of a refined crystalline strengthening, precipitation strengthening and phase change strengthening mechanism, the H-shaped steel organization state with single-phase bainite on the surface layer and complex-phase organization inside and with small grains is obtained, the addition of the alloy elements is obviously reduced, the productioncost is lowered, the weather resistance of the H-shaped steel is improved, the welding performance of the steel is enhanced, and the production efficiency is increased.

The invention relates to an X80 pipeline steel coil with low cost and high toughness and a production method thereof, belonging to the technical field of low-alloy steel. The X80 pipeline steel coil comprises the following chemical components by percent: 0.03-0.07 percent of C, 0.10-0.25 percent of Si, 1.25-1.95 percent of Mn, at most 0.018 percent of P, at most 0.005 percent of S, 0.06-0.12 percent of Nb, 0.15-0.30 percent of Mo, 0.008-0.020 percent of Ti, 0.15-0.35 percent of Cr, 0.020-0.045 percent of Als, 0.0015-0.0035 percent of Ca, at most 0.0060 percent of N and the balance of Fe and inevitable impurities. The X80 pipeline steel coil disclosed by the invention has the advantages of simple component design and low production cost, and a lot of precious metal resources are saved. Meanwhile, the X80 pipeline steel coil has higher mechanical property and good impact toughness and has a wide market promotion prospect.

The invention discloses automobile steel with high toughness and high product of strength and elongation and a preparation method thereof, and belongs to the technical field of preparation of automobile steel with high toughness and high product of strength and elongation. The steel comprises, by weight, 0.15%-0.60% of C, 0%-2.0% of Si, 0%-2.0% of Ni, 3.0-6.0% of Mn, 2.0-6.0% of Al, and the balance of Fe and inevitable impurity elements. On this basis, one or more of the following microalloying elements can be added: by weight, 0-0.10% of Nb, 0-0.10% of V, 0-0.10% of Ti, 0-0.10% of Mo, 0-0.50%of Cu, and 0.0005-0.005% of B. The automobile steel and the preparation method have the advantages that a multi-phase, multi-layer and metastable microstructure is formed through alloying of C, Mn, Al and the like and rolling and annealing of a two-phase region; at -40 DEG C, the V-type impact toughness is not smaller than 120 J, the product of strength and elongation is not lower than 50 GPa%, the cost is far lower than that of traditional high manganese steel, the comprehensive mechanical property is far higher than that of medium manganese steel, and low cost and high performance are achieved. The automobile steel can be applied to the field of white automobile body and transmission part manufacturing in the form of bars or plates.

The invention relates to casting medium alloy steel for a cold stamping mould of an automobile. The casting medium alloy steel is characterized by comprising the following chemical components in percentage by weight: 0.50-0.65% of C, 0.90-1.20% of Si, 0.60-0.90% of Mn, 4.50-5.50% of Cr, 0.75-0.90% of Mo, 0.70-0.80% of V, less than or equal to 0.02% of S or less than or equal to 0.03% of P. The casting medium alloy steel has high wear resistance and strong toughness, is low in production cost, is easy to process, has the overall quenching hardness of HRC59-62 and can meet the use requirements of the mould.

The invention discloses a cooling after rolling method for high-weather fastness hot-rolled H-steel with yield strength up to 550MPa. The high-weather fastness hot-rolled H-steel with the yield strength up to 550MPa comprises the following components in weight percentage: 0.06-0.12 percent of C, 0.30-0.60 percent of Si, 1.25-1.50 percent of Mn, 0.010-0.030 percent of P, 0.001-0.015 percent of S, 0.20-0.35 percent of Cu, 0.20-0.40 percent of Cr, 0.15-0.30 percent of Ni, 0.10-0.12 percent of V, 0.008-0.014 percent of N, 0.003-0.030 percent of Als and the balance of ferrum and residual trace impurities. An H-steel rolling process comprises the following steps of: heating a casting blank in a heating furnace, rolling by a roughing mill, rolling by a universal rolling mill, and performing two-stage rapid cooling after rolling is ended. According to the cooling after rolling method for the high-weather fastness hot-rolled H-steel with the yield strength up to 550MPa, through adopting a two-stage rapid cooling method after hot rolling is performed on the H-steel and by utilizing a refined crystalline strengthening mechanism, a precipitation strengthening mechanism and a phase change strengthening mechanism, an H-steel texture which is provided with single-phase bainite on the surface layer, is of a multiphase structure inside and has fine grains is obtained, thereby, the additive amount of alloying elements is reduced, the production cost is obviously reduced, the welding performance of the steel is improved, and the production efficiency is increased.

The invention provides high-plasticity-toughness low-alloy ultrahigh-strength steel and a preparation method, and relates to the technical field of engineering materials. The high-plasticity-toughnesslow-alloy ultrahigh-strength steel comprises the following chemical components in percentage by mass: 0.30-0.43% of C, 0.50-1.60% of Mn, 0.80-2.00% of Si, 0.80-1.50% of Cr, 2.50-3.50% of Ni, 0.50-1.50% of W, 0.20-0.80% of Mo, 0.05-0.20% of V, 0.01-0.20% of Nb, not greater than 0.005% of S, not greater than 0.010% of P, not greater than 0.050% of Al, and the balance Fe. The mechanical performanceof the steel material reaches the design index; the steel material can replace G50 and DT300 steel materials in a certain field; and the steel material is higher in hardenability, and can satisfy thelarge-specification requirements on the steel material.

The invention discloses a cooling-after-rolling method of high-weather resistance hot-rolling H-shaped steel with yield strength of 500MPa. The high-weather resistance hot-rolling H-shaped steel with yield strength of 500MPa comprises the following components in percentage by mass: 0.06-0.12% of C, 0.30-0.60% of Si, 0.80-1.20% of Mn, 0.010-0.030% of P, 0.001-0.015% of S, 0.20-0.35% of Cu, 0.20-0.40% of Cr, 0.15-0.30% of Ni, 0.040-0.060% of Nb, 0.003-0.030% of Als, and the balance of iron and residual trace impurities. The H-shaped steel rolling technology comprises the steps of: heating with a casting blank heating furnace, rolling with a cogging mill, rolling with a universal mill and two-segment quick cooling after the rolling. In the invention, by adopting a two-segment quick cooling method after the hot rolling of the H-shaped steel and by use of a refined crystalline strengthening, precipitation strengthening and phase change strengthening mechanism, the H-shaped steel organization state with single-phase bainite on the surface layer and complex-phase organization inside and with small grains is obtained, the addition of the alloy elements is obviously reduced, the production cost is lowered, the weather resistance of the H-shaped steel is improved, the welding performance of the steel is enhanced, and the production efficiency is increased.

The invention discloses a method for cooling a low-alloy hot-rolled H-shaped steel with yield strength of 550MPa after rolling, wherein the low-alloy hot-rolled H-shaped steel with the yield strength of 550MPa comprises following components by mass: 0.13-0.18% of C, 0.30-0.50% of Si, 1.40-1.60% of Mn, not more than 0.025% of P, not more than 0.025% of S, 0.10-0.12% of V, 0.010-0.014% of N, 0.003-0.030% of Als, and the balance of iron and residual trace impurities; a rolling process of the H-shaped steel is as follows: heating casting blank in a heating furnace, performing rolling by a cogging mill, performing rolling by a universal rolling mill and quickly cooling the steel in two-stage manner after rolling; the method adopts the two-stage quick cooling method after the H-shaped steel is hot-rolled, so that the high-temperature H-shaped steel is cooled to proper temperature at short time; by using the cooling method after colling, texture state of the H-shaped steel with fine crystal particles and complex phase texture is obtained, adding amount of the alloy elements is drastically reduced, production cost is notably reduced when requirement of high-strength performance is satisfied, and welding performance of the steel and production efficiency are improved.

Disclosed is a ferrite antibacterial stainless steel for low-chrome copper-containing dishware and manufacturing method, wherein the stainless steel matrix comprises (by wt%) Cr 12.0-14.0%, Cu 0.70-2.20%, C <=0.08-0.15, the preparing process comprises pre-processing melted iron, passing through composite revolving furnace, vacuum oxygen decarbonization furnace, refined-smelting ladle furnace, continuous plate blank casting, casting blank annealing, tandem rolling, and annealing in a bell-type furnace.

The invention particularly relates to a method for improving the overall performance of multi-phase steel with a hot-rolled deformation substructure. According to the technical scheme, the method includes the steps that low-carbon steel subjected to rough rolling is precisely rolled within the section of Ac3-910 DEG C at first, and the precise-rolling reduction rate is accumulated to be 60%-100%;then the temperature is lowered to 540-710 DEG C at the speed of 80-150 DEG C / s; afterwards, heat preservation lasts for 5-12s or air cooling lasts for 5-12s; and finally laminar cooling is conductedto an indoor temperature. The low-carbon steel comprises, by weight, 0-0.10% of C, 0.5%-1.6% of Mn, 0-0.35% of Si, 0-0.030% of Nb, 0.02%-0.06% of Al, 0-0.75% of Cr, 0-0.048% of P, 0-0.005% of S and the balance iron and inevitable impurities. The method for improving the overall performance of the multi-phase steel with the hot-rolled deformation substructure is simple in technology, the content ofthe alloy elements is low, and the overall performance of the obtained multi-phase steel is good.

The invention discloses a wear-resistant lining board and a preparation method thereof. The invention solves the problems of high cost and the like in the wear-resistant lining board in the prior art. The wear-resistant lining board comprises the following component elements in percentage by mass: 0.25%-0.30% of C, 0.70%-0.90% of Mn, 0.30%-0.60% of Si, 0.8%-1.10% of Cr, 0.15%-0.25% of Mo, 0.015%-0.050% of Al, 0.025%-0.050% of Zr, at most 0.50% of Cu, at most 0.020% of Nb, at most 0.020% of Sn and the balance of Fe and inevitable impurity. The invention also provides a preparation method of the wear-resistant lining board, which comprises the following steps: proportioning, casting, casting head cutting and heat treatment. The wear-resistant lining board disclosed by the invention has the advantages of low cost, favorable mechanical properties and long service life.