54results about How to "The ingredients are designed to be simple" patented technology

The invention relates to a non-quenched acicular structure high strength low yield ratio weathering resistant steel and a production method thereof. The steel comprises components by weight percent: basic components: 0.03-0.08% of C, 0.30-0.60% of Si, 1.30-1.80% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.30-0.60% of Cu, 0.20-0.50% of Ni, 0.40-0.80% of Cr, 0.10-0.40% of Mo, 0.030-0.080% of Nb and less than or equal to 0.04% of Ti; optional components are two or more in less than or equal to 0.04% of AlS and less than or equal to 0.40kg/t steel of RE or less than or equal to 0.005% of Ca; and the rest of Fe and impurities. Welding cold crack is low in susceptibility coefficient and high in corrosion resisting index. The steel has simple components as wellas excellent moldability, weatherability, weldability and low temperature toughness; meanwhile, the preparation technique is simple, heat treatment is not needed, the production period is short, and the production cost is low.

The invention belongs to the field of preparing a soft magnetic alloy in functional materials, in particular relates to a novel iron-based nanocrystalline soft magnetic alloy material with excellent comprehensive performance, such as low cost, high saturation magnetic induction intensity, low loss, and the like. The novel iron-based nanocrystalline soft magnetic alloy material comprises the following chemical constituents by atomic percentage: 6-9 Si, 4-7 B, 3-6 P, 0.5-1.5 Cu, 0.05-0.15 Nb and the balance of Fe. Compared with traditional iron-based amorphous or nanocrystalline soft magnetic alloys, such as Metglas, Finemet, Nanoperm and the like, the iron-based nanocrystalline soft magnetic alloy greatly decreases the consumption of the noble element Nb, has the advantages of simple constituent design, low cost and excellent comprehensive performance of the materials by substituting low-price P for noble B, can substitute the prior silicon-steel sheets and iron-based amorphous or nanocrystalline soft magnetic alloys and can be widely applied to the fields, such as power transformers, mutual inductors, and the like.

The invention relates to weather-resistant bridge steel with yield strength not less than 345 MPa and a preparation method thereof. The weather-resistant bridge steel with the yield strength not lessthan 345 MPa comprises the following components of, in percentage by weight, 0.07%-0.11% of C, 0.15%-0.30% of Si, 0.80-1.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.01-0.04% of Al, 0.20-0.40% of Cr, 0.20-0.40% of Cu, 0.20-0.50% of Ni, 0.020-0.050% of Nb, 0.010-0.040% of Ti and the balance Fe and inevitable impurities; and the preparation method comprises thefollowing steps of smelting, slow cooling, heating, rolling, cooling and stacking and cooling. According to the weather-resistant bridge steel with the yield strength not less than 345 MPa and the preparation method thereof, the low-cost micro-alloying design is adopted, the production period is short, the cost is low, popularization and application are facilitated, the weather-resistant bridge steel has excellent welding performance, strong toughness and strong plasticity matching performance, low yield ratio, corrosion resistance, weather resistance, welding performance and anti-fatigue performance, compared with traditional weather-resistant steel, the weather resistance is improved by one time or above, the weather-resistant bridge steel can replace the traditional high-strength weathering steel, and can be applied to the fields of bridges, outdoor tower frames and the like without coating, so that the use cost and the maintenance cost are reduced.

The invention discloses a manufacturing method of a hot-dip galvanized steel belt with yield strength over the 580 Mpa level. The method comprises the following steps that chemical compositions and mass percentage for manufacturing the steel belt are selected, and the chemical compositions comprise 0.16%-0.20% of C, smaller than or equal to 0.05% of Si, 1.1%-1.3% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.02% of S, 0.025%-0.06% of Als and the balance Fe and inevitable impurity; the chemical compositions are subjected to smelting and continuous casting, a plate blankis formed, and the thickness of the plate blank is 230 mm; the working procedure of hot rolling is carried out; the working procedure of acid continuous rolling is carried out; and the working procedure of hot-dip galvanizing is carried out. According to the manufacturing method of the hot-dip galvanized steel belt with yield strength over the 580 Mpa level, the composition design is simple, precious alloy elements are not added, the 600-630 DEG C semi-annealing technology is adopted, energy consumption is small, the production cost is low, the high yield strength and certain machining performance can be achieved, and the requirements of industries like building can be met.

The invention discloses ship plate steel with thickness not greater than 100mm and yield strength of 390MPa and a preparation method. The ship plate steel comprises C, Si, Mn, P, S, Nb, V, Al, Ti, Mo,Cr, Cu, Ni, and the balance Fe and impurities. The preparation method comprises the following steps: heating a continuous casting slab which comprises the same components with the ship plate steel; the continuous casting slab is sequentially processed by cooling through first laminar flow, air cooling and cooling through second laminar flow after being subjected to two-section type rolling; thenthe continuous casting slab is cooled through air until room temperature is reached, thus obtaining the ship plate steel. The ship plate steel has the obvious advantages that the thickness of the shipplate steel is not greater than 100mm; the yield strength is 390MPa; the low-temperature toughness is outstanding; in addition, the component design is simple; the welding performance and the corrosion resistance are outstanding; the comprehensive mechanical property is high.

The invention provides a cavitation-corrosion-resistant surfacing welding material, which belongs to the field of novel welding materials. The surfacing material specifically comprises the following chemical components in percentage by mass: less than or equal to 0.10 percent of C, 12 to 25 percent of Cr, 1.0 to 2.0 percent of Co, 1.5 to 2.5 percent of Mo, 6.0 to 8.0 percent of Ni, 0.5 to 1.0 percent of Mn, 0.3 to 0.8 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe. The invention has cavitation-corrosion-resistant stainless steel, cobalt-based alloy or nickel-based alloy prepared into cavitation-corrosion-resistant surfacing welding wires and then performs surfacing on conventional materials, and the cavitation-corrosion resistance and lifespan of workpieces subjected to surfacing are greatly improved, while maintenance cost is reduced.

The present invention belongs to the field of welding material technology, and is welding rod for welding joint of different kinds of steel, especially of heat resistant pearlite steel and stainless steel. The ultralow carbon welding rod of the present invention consists of: C 0.03-0.06 wt%, Si 0.2-0.5 wt%, Mn 0.5-0.8 wt%, Cr 1.5-2.5 wt%, Mo 0.4-0.65 wt% and V 0.10-0.35 wt%, except Fe. Compared with available technology, the present invention has simple and reasonable component design, capacity of effectively preventing the formation of the carbon immigrating layer in fusion area of joint, no martensite structure formed in the joint, excellent welding performance and high normal temperature and high temperature performance of the welded joint.

The invention relates to hardenability-remaining high-strength low-temperature toughness spring steel, which belongs to the technical field of alloy steel. The technical scheme is that chemical components are as follows, by weight percentage, 0.56-0.64% of C, 1.40-2.00% of Si, 0.40-0.80% of Mn, 0.70-1.00% of Cr, 0.10-0.40% of Ni, Cu<=0.25%, P<=0.025%, S<=0.025% and the balance Fe and impurities. Tempering tensile strength of the spring steel >=1750Mpa, the temperature of the spring steel is 880+/-20 DEG C before quenching, and after quenching the temperature is 430+/-50 DEG C. Aku2>=20J at normal temperature or at the temperature of -40 DEG C, the Aku2 is impact energy of a 2mm U-shaped notch, and the unit is J. In an end-quenching test, J20>=55HRC, J20 represents hardness of a position in the end-quenching test 20mm away from a water spraying end, and the unit is HRC. The hardenability-remaining high-strength low-temperature toughness spring steel has the advantages of improving hardenability of steel and impact toughness and being especially suitable for manufacturing a cylindrical spiral spring with specification <=phi50 mm.

The invention discloses alitizing modified steel used for a P110-grade oil sleeve and a tubular product manufacturing method of the alitizing modified steel. The alitizing modified steel comprises, by weight, 0.07-0.09% of C, 2.10-2.35% of Mn, 1.0-1.2% of Cr, 0.60-0.80% of Si, not more than 0.03% of S, not more than 0.03% of P, not more than 0.020% of Ti, the balance iron and inevitable impurities. A tubular product is obtained by heating a tube blank, conducting punching, conducting sizing after conducting rolling, and conducting slow refrigeration after conducting air cooling. The manufactured tubular product completely meets the requirements of API SPEC 5CT for performance of steel used for the P110 oil sleeve, the production and manufacture cost can be reduced, and the production manufacturability is improved. In addition, the carbon content of chemical components is low, microalloying is achieved, the impact toughness is high, the welding performance is good, the anti-corrosion performance is good, and the oil sleeve steel has good crack arrest capacity.

The invention discloses an ultra-thin ammonia corrosion resisting moving pressure container steel plate and a preparing method thereof. Steel comprises following chemical components including, by masspercent, smaller than or equal to 0.23% of C, 0.31%-0.68% of Si, 0.71%-1.35% of Mn, smaller than or equal to 0.008% of P, smaller than or equal to 0.003% of S, 0.51%-1.55% of Al, smaller than or equal to 0.02% of W, 0.04%-0.13% of V, 0.0007%-0.0013% of B, smaller than or equal to 0.10% of Ce and the balance Fe and other inevitable inclusions. Through adding of a small amount of Al, W, the V microalloy element and the rare earth element Ce, steel ball inclusions are effectively purified, and grains are purified; through combination of the alloy elements, hydrogen and nitrogen, obvious hydrogenand nitrogen corrosion resisting performance is achieved; and through rolling technology parameter optimization and the proper heat treatment technology, the steel has good strength, low-temperaturetenacity and ammonia corrosion resisting performance, technology parameters are easy to control, cost is low, efficiency is high, and the ultra-thin ammonia corrosion resisting moving pressure container steel plate is suitable for large-scale production.

The invention relates to a method for eliminating surface crystalline oxides of a welded joint and belongs to the technical field of steel welding. According to the method for eliminating the surfacecrystalline oxides of the welded joint, a first steel plate and a second steel plate are welded to form a welded joint, welding adopts a plasma welding method, the first steel plate and the second steel plate are both made of acid pickling plates, and according to the weight ratio, the content of Si is controlled to be smaller than or equal to 0.05% in the chemical ingredients of each acid pickling plate. By finding the main reason of generating surface crystalline oxides during plasma welding of the acid pickling plates, the technical means of controlling the mass fraction of the Si in the steel to be smaller than or equal to 0.05% is adopted, so that the problem that a weld joint generates surface oxides is solved, and the potential safety hazard that the oxides on the shell of a compression exceed the standard is eliminated. Practice verifies that by the adoption of the method for eliminating the surface crystalline oxides of the welded joint, the surface of the welded joint is smooth, and the crystalline oxides are not generated.