53results about How to "Reduce rolling load" patented technology

The invention relates to a processing method for producing low-cost high-formability IF (interstitial-free) steel, which is based on thin-slab continuous casting and rolling and adopts a ferrite rolling process to produce the IF steel, belonging to the technical field of IF steel production. The processing method comprises the following working procedures of steelmaking, continuous casting, heating, rolling, cooling and coiling. A thin-slab continuous casting machine is adopted, the thickness of a continuous casting slab is at most 100mm, and the charging temperature is at least 880 DEG C. During hot rolling, a roughing mil and a finishing mill keep a continuous rolling relationship and keep micro-tension control, and water cooling equipment is used between the roughing mil and the finishing mill and is used for uniformly reducing the temperature of an intermediate slab with a thickness of 12-25mm from the temperature at least 950 DEG C of the outlet of the roughing mil into the range of 750-850 DEG C. Finish rolling is carried out in a ferrite area, and a lubrication rolling technology is adopted. The coiling temperature is higher and is 680-760 DEG C, slow cooling is carried out after coiling, and thereby an annealing process is finished. The invention provides a method for obtaining high-formability hot rolled sheets without cold rolling and cover annealing. The method has the advantages of being simple in process, low in cost, high in production efficiency, short in flow and the like, and the formability of products is higher.

The present invention discloses one kind of rolling pass system for deformed channel steel with leg length/channel width ratio of 0.8-1.1 in small scale rolling mill. The rolling pass system consists of directly deepening coarse rolling pass, butterfly type middle rolling pass arranged in narrow-wide-narrow rule and straight leg finish gage pass with optimized nip condition. The present invention has improved deforming condition to realize rolling large steel material in small rolling mill, and has the positive effects of raising rolling capacity of rolling mill, reducing pass height, reducing depth of roller slot, decreasing rolling load, etc.

The invention discloses a control method for load balance of cold-strip steel rolling mill of double motor drive. The feature is that it is realized by control the technical parameter of roller, technical parameter of emulsion, dynamically adjusting rolling unit tension, percent of reduction and acceleration of raising speed of driving motor. The invention could compensate the work roller friction by the control parameters of percent of reduction, unit tension and acceleration of driving motor according to the actual parameter of rolling strip steel. The method could improve the stability during rolling process and control the motor speed difference caused by load difference by 3%.

The invention provides a production method of a high-strength saw bit steel coil. The production method is suitable for a rolled steel coil of saw bit or saw blade steel with the thickness of 3.0-14.0mm. The component design comprises 0.49-0.52 of C, 0.2-0.35 of Si, 1.45-1.60 of Mn, less than or equal to 0.015 of P, less than or equal to 0.005 of S, 0.2-0.25 of Cr, 0.12-0.16 of V, 0.020-0.025 of Al and less than or equal to 0.006 of N by weight percent. The production process adopts a converter smelting-LF (ladle furnace) refining-hot continuous rolling process and comprises slab continuous casting and segregation control in saw bit steel production, control of the slab continuous offline slow cooling temperature of the saw bit steel and the control of the roll rolling start temperature, the rolling finished temperature and the coiling temperature. The horizontal yield of the saw bit steel coil is MPa600-750, the horizontal tensile strength is MPa930-1040, the elongation is 19.5-26%, and the hardness of HRC is 20-28.

The invention relates to a drahtstahl for a fastening piece and a production method thereof, and the drahtstahl comprises the following components by weight percent: 0.39-0.48 % of C, 0.15-0.35% of Si, 0.30-0.90% of Mn, 0.60-1.20% of Cr, 0.010-0.07% of Als, less than or equal to 0.035% of P, less than or equal to 0.035% of S and the balance Fe and unavoidable impurity; and the production method comprises the following steps: smelting with a clean steel process and casting into a blank, and adding Si-Ca line in the refining; heating the continuous casting to 980-1,080 DEG C; rough rolling: controlling the deflection to be 70-80%; intermediate rolling: controlling the deflection to be 80-90%; pre-precision rolling: controlling the deflection to be 65-75%; water-cooling until the temperature is cooled to be 1,000-1,020 DEG C; precision rolling: controlling the deflection to be 60-90%; water-cooling for the second time until the temperature is cooled to be 800-900 DEG C; spinning; cooling to phase change initial temperature, namely the range from Ar3 to 50 DEG C higher than Ar3 by adopting an aerial fog mixed method; and continually cooling until the temperature is cooled to be 400-500 DEG C and naturally cooling to environment temperature. The invention can be drawn directly, has good cold deformation and is not easy to crack.

The invention relates to the technical field of hot rolling, in particular to a control method for surface oxidation pocking defects of a hot-rolled pickled plate. The control method includes the steps that the chemical components of a steel billet are controlled to include, by mass, 0.05-0.15% of Si, at most 0.01% of P and the balance Mn, Nb, Ti and a Fe substrate. In the heating process of the steel billet, the steel billet with the thickness being 135-250 mm is put into a heating furnace and heated for 160-200 min, and the tapping temperature of the steel billet is controlled to be 1180-1240 DEG C. The thickness of an intermediate billet is controlled to be 26-34 mm after a descaling process. In the precision rolling process, the precision rolling inlet temperature is controlled to be 980-1020 DEG C, and the finish rolling temperature is controlled to be 850-890 DEG C. The control method for surface oxidation pocking defects of the hot-rolled pickled plate can effectively restrain the occurrence of surface oxidation pocking defects of the hot-rolled pickled plate with the thickness being at most 2 mm and the tensile strength being at least 500 MPa.

The invention provides a high-strength container steel plate and a preparation method thereof. The high-strength container steel plate comprises the following chemical components in percentage by weight: 0.06-0.08% of C, 0.20-0.30% of Si, 1.3-1.5% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.035-0.045% of Nb, 0.20-0.30% of Ni, 0.15-0.25% of Cr, 0.15-0.25% of Mo, 0.035-0.045% of V, 0.01-0.02% of Ti and the balance Fe and inevitable impurities. The high-strength container steel plate provided by the invention has tensile strength greater than 610 MPa, and is a low-welding-crack-sensitivity steel plate with good plasticity and excellent low-temperature impact toughness. A final metallographic structure of the steel plate is tempered sorbite and tempered bainite.

An embodiment of the invention provides a high-strength steel rolling method and device. The method comprises the steps of controlling the reduction ratio of a first rack to be 15% to 25%, the rollingforce to be 23929 kn to 26448 kn and the speed to be 79 mpm to 81 mpm; controlling the reduction ratio of a second rack to be 15% to 25%, the rolling force to be 24752 kn to 27356 kn, the speed to be104 mpm to 106 mpm and the forward slip to be -0.955 to 3.045; controlling the reduction ratio of a third rack to be 15% to 25%, the rolling force to be 23465 kn to 25935 kn, the speed to be 154 mpmto 156 mpm and the forward slip to be -0.954 to 3.046; controlling the reduction ratio of a fourth rack to be 12%-20%, the rolling force to be 23144 kn to 25580 kn, the speed to be 199 mpm to 201 mpmand the forward slip to be -0.957 to 3.043; and controlling the reduction ratio of a fifth rack to be 5% to 15%.

The invention discloses production method for rapidly cooling a medium plate after rolling, belonging to the technical field of production of medium plates. The method comprises the following process steps of: adjusting an ultrafast cooling (UFC) frame to 300mm+h till the cross point between extension lines of upper and lower nozzles of equipment is positioned on the central line of a steel plate; during ultrafast cooling, setting cooling rules and parameters according to the steel kind, specification as well as required final cooling temperature and cooling speed of the steel plate; startingmiddle spraying, side spraying and air blowing to remove residual water from the surface of steel plate to increase the cooling uniformity, starting UFC equipment, and spraying water onto the steel plate with a gap nozzle and a ganged nozzle for cooling; and controlling the cooling speed and cooling termination point according to the CCT (Continuous Cooling Transformation) curve of steel, whereinthe cooling speeds of steel plates of different thicknesses are 5-80 DEG C/s, and the final cooling temperature is controlled at 450-800 DEG C. The method has the advantages: by controlling the cooling process of the steel plate after rolling, control over phase change and organization is realized, and the aim of enhancing the roughness of the steel plate is fulfilled.

The invention relates to Ti-containing medium-carbon steel for a car floor or a cold roll forming structural piece, as well as a method for continuous casting and continuous rolling by adopting sheet billets. The Ti-containing medium-carbon steel comprises the following constituents by weight percent: 0.17 to 0.20 percent of C, 0.1 to 0.4 percent of Si, 0.6 to 1.8 percent of Mn, 0.04 to 0.15 percent of Ti, 0.02 to 0.06 percent of Als, 0 to 0.025 percent of P, 0 to 0.005 percent of S, 0 to 0.65 percent of Ni, 0 to 0.2 percent of Cu, and 0 to 0.008 percent of N. The Ti-containing medium-carbon steel is produced according to the following steps: smelting; outside furnace refining and continuous casting to produce casting blanks; uniformly heating the casting blanks; rolling; reeling after laminar flow; and standing by. As the Ti-containing medium-carbon steel and the method are adopted, the invention has the advantages that the constituents are simple; a steel plate has no internal stress; the shape of the steel plate is beautiful; and the yield strength is at least 550 MPa.

The invention discloses a production method for a light-gauge hot rolled steel plate, which comprises the steps that: a. the distance between an upper roller and a lower roller of each frame of a hot strip mill is adjusted and the percent of reduction epsilon 1 of a first frame is adjusted to be 53 percent to 63 percent, wherein, the epsilon 1 is equal to (H1-h1)/H1, therein, H1 is the thickness of a slab at an inlet of the frame, h1 is the thickness of a slab at an outlet of the fame; b. high temperature slabs are sent to a rolling inlet of the frames that are arranged in sequence for rolling; c. the light-gauge hot rolled steel plate is output from a rolling outlet of a last frame after the slabs are rolled by the varied frames. The invention promotes the percent of reduction of the first frame as high as possible when ensuring security to reduce the load of rollers of rear frames, thereby improving rolling efficiency and product quality.

The invention provides a production method of a hot dipped steel coil. The method comprises steps of hot rolling, cold rolling, annealing, galvanizing and straightening on a billet. The batching temperature of the hot rolling is 500-550 DEG C; and the billet contains, calculated by a total weight of the billet, 0.04-0.1 wt% of carbon, 0.2-0.5 wt% of manganese, 0.06-0.09 wt% of phosphorus and 0.015-0.03 wt% of niobium. The method provided by the invention can obtain structural hot dipped steel coil with high width precision, and yield strength level of grade 350M Pa.

A hydraulic machine has a gear wheel (2) with outwardly extending teeth and a gear ring (4) with inwardly extending teeth formed by rollers each of which is supported in a pocket (8) in the gear ring, and pressurized spaces are formed between the gear wheel and the inwardly extending teeth.

To keep the wear of the machine small each pocket (8) has at least two different radii (R1, R2, Rn) whereby a radius (R2, Rn) at a smaller displacement from the edge (12) of the pocket is larger than a radius (R1) at a larger displacement from the same edge (12) of the pocket (8).

The invention discloses a rolling method for strip steel. The rolling method comprises the following steps of: determining a thickness value of intermediate billet according to thickness of slab and rolling bearing limit of a rough milling unit, wherein the thickness of the slab is determined according to the thickness of to-be-rolled strip steel; judging whether the thickness value of the intermediate billet is within a required thickness value of the intermediate billet or not; and if the thickness value of the intermediate billet is within the required thickness value of the intermediate billet, performing rough rolling, fly-shearing and finish rolling on the slab to obtain the strip steel. According to the rolling method disclosed by the invention, the thickness value of the intermediate billet is determined according to the thickness of the slab and the rolling bearing limit of the rough milling unit, so that the thickness of the intermediate billet is reduced as much as possible, weight of cropping of front and back ends of the intermediate billet is reduced, the yield is increased, production cost is reduced, and the technical problems that the thickness of the intermediate billet rolled by the rolling method in the prior art is relatively great, weight of cropping of front and back ends is increased, the yield of strip steel finished products is greatly reduced, and production cost is increased are improved.

The invention discloses non-quenched and non-tempered 980 MPa grade high-strength strapping steel and a production method thereof. The production method comprises work procedures of hot rolling, cooling, cold rolling and bluing. The non-quenched and non-tempered 980 MPa grade high-strength strapping steel is characterized in that chemical components of the non-quenched and non-tempered 980 MPa grade high-strength strapping steel comprise, by weight percentage, 0.17%-0.23% of C, 1.15%-1.35% of Mn, smaller than or equal to 0.35% of Si, smaller than or equal to 0.015% of S, smaller than or equal to 0.025% of P, larger than or equal to 0.015% of Als, smaller than or equal to 0.0060% of N and the balance iron and inevitable impurities. According to the method, medium low C is adopted, compared with conventional Mn component design, by means of control over a cooling path of the cooling work procedure, the partition of C in the phase change process of the steel is adjusted, medium temperature reeling is controlled, the pearlite transformation organization conversion is avoided, a ferrite bainite organization with the performance better than that of ferrite pearlite can be obtained, and ferrite bainite steel has high tensile strength, good uniform elongation performance and high n value. By means of the method, the high-strength strapping steel with the tensile strength larger than or equal to 980 Mpa and the elongation rate A30 larger than or equal to 10% can be obtained.

The invention belongs to an aluminum alloy plasticity processing lubrication technology method, which concretely discloses an aluminum alloy ring piece radial-axial rolling lubricant and a lubrication process thereof. The lubricant comprises the following components by mass ratio: 65-80% of lard, 15-30% of graphite, 3.5-4.5% of molybdenum disulfide and 0.5-1.5% of barium petroleum sulfonate. The lubrication process aims at specific phases for lubrication, and has good adaptability for radial-axial rolling shaping on the aluminum alloy ring piece, the defect of roll banding, surface peeling, polygon and ellipse during an aluminum alloy ring piece rolling process can be effectively solved, rolling process stability, primary rolling qualified rate and product size precision are increased, production period is shortened, production cost is reduced, and product quality is guaranteed.

Disclosed is a hot rolling oil which enables to reduce a rolling cost by effectively decreasing a rolling load when a steel member is heated and rolled within a temperature range of 200-1200 DEG C. Also disclosed is a method for hot rolling a steel member by using such a hot rolling oil. Specifically disclosed is a hot rolling oil containing a base oil and at least one polymer selected from the group consisting of isobutylene homopolymers and isobutylene copolymers having a number average molecular weight of 8,000-100,000. Also specifically disclosed is a method for hot rolling a steel member, which is characterized in that the hot rolling oil is fed by a water injection system.