38results about How to "Reduce rolling temperature" patented technology

The invention belongs to the technical field of steel materials, and relates to a 550 MPa-grade low-compression-ratio high-toughness steel plate for an ocean engineering platform and a production method, in particular to a steel plate with high strength and toughness under conditions of the low carbon content and the low compression ratio for ocean engineering and the production method. The steel plate comprises chemical components in percentage by weight as follows: 0.04-0.10% of C, 0.2-0.4% of Si, 1.0-1.5% of Mn, smaller than 0.010% of P, smaller than 0.003% of S, 0.5-0.8% of Ni, 0.2-0.5% of Cu, 0.30-0.80% of Cr, 0.1-0.3% of Mo, 0.02-0.05% of Nb, 0.010-0.025% of Ti and the balance of Fe and inevitable impurities. The alloy C is low in content, and welding is easy. Under the condition that the thickness of a casting blank is only 250 mm, the content of the C, the P and the S is controlled strictly, the temperature is decreased and then increased, the TMCP process is optimized, the rolling temperature is decreased, the reduction at rough rolling and finish rolling stages is distributed reasonably, the cooling process and the tempering heat treatment temperature are optimized, and steel can have high strength and high low-temperature toughness under the condition of the low compression ratio (the minimum is only 3.125:1).

The invention mainly belongs to the field of metal material preparation and machining and particularly relates to a rolling preparation method for a high-silicon electrical steel thin strip. The method comprises the steps of firstly, taking a high-silicon electrical steel casting blank heated in a furnace as the raw material, so that a high-silicon electrical steel plate slab is prepared and obtained, then conducting warm rolling on the high-silicon electrical steel plate slab in a stepwise-cooling mode, so that a high-silicon electrical steel warm-rolled strip is obtained, and conducting low temperature annealing and cold rolling on the high-silicon electrical steel warm-rolled strip, so that the high-silicon electrical steel thin strip is prepared and obtained. According to the rolling preparation method for the high-silicon electrical steel thin strip, warm rolling in a stepwise-cooling mode is adopted, the accumulated maximum warm rolling deflection is not influenced, meanwhile, the rolling temperature can be lowered, and a better toughening and plasticizing effect is obtained; after warm rolling is completed, annealing is conducted in the proper condition, residual tension of sides of the high-silicon electrical steel warm-rolled strip is effectively lowered, meanwhile, restoration of the ordered structure is avoided, and the cold rolling yield is raised.

The invention relates to high-strength thin band steel for cold forming and a manufacturing method thereof. The method comprises the following steps: after discharging a cast band from a crystal roll, cooling the cast band forcibly and uniformly in a mode of spraying dry ice under high pressure; quickly cooling the cast band to be below 1,280 DEG C at the cooling speed of 200-300 DEG C / s; performing austenite on-line recrystallization rolling, wherein the rolling temperature is 1,050 to 1,200 DEG C and the rolling reduction is 20 to 50 percent; and quickly cooling the band steel subjected to hot rolling in an anti-oxidation mode, wherein the anti-oxidation quick cooling speed is 80 to 200 DEG C / s and the reeling temperature is 500 to 600 DEG C. By the method, the high-strength thin band steel for automobile cold forming and with low yield strength and excellent stamping performance can be obtained, can be directly used in a mode of substituting heat for cold, cancels the cold rolling procedure and greatly reduces the production cost.

The invention discloses a steel strip for a thin-wall oil bucket and a manufacturing method thereof. The manufacturing method comprises the following steps: casting a crystal roller from a cast strip by using a thin strip casting process, subsequently uniformly reinforcing and cooling the cast strip in a mode that dry ice is sprayed at a high pressure, and rapidly cooling the cast strip to be less than 1,280 DEG C, wherein the cooling velocity is 200-300 DEG C / s; when the steel strip is subjected to boron treatment in such a mode, large boron nitride separation is prompted, occurrence of low-melting-point phase B2O3 and separation of fine AlN are prevented, and the purposes of uniformly austenite grains and reducing the yield ratio are achieved; subsequently performing on-line recrystallization and rolling on the austenite; subsequently atomizing and cooling so as to cool down the hot-rolled steel strip; finally coiling the steel strip. By adopting the manufacturing method, the thin-wall with low yield ratio and excellent stamping property for the thin-wall oil bucket is manufactured. The hot-rolled steel strip for the thin-wall oil bucket can be used in hotness instead of coldness, and a cold-rolling procedure is omitted, so that the production cost is greatly lowered.

The invention relates to a large reduction rolling method for magnesium alloy. According to the rolling method, a hard alloy lining plate is additionally arranged on the upper surface or the lower surface of the magnesium alloy, or two hard alloy lining plates are additionally arranged on the upper surface and the lower surface of the magnesium alloy at the same time, and the added hard alloy lining plates are rolled synchronously together with the magnesium alloy. The rolling method includes the steps that after a high temperature lubricating agent is evenly smeared on the surfaces of the lining plates and the surface of the magnesium alloy, the high temperature lubricating agent, the lining plates and the magnesium alloy are simultaneously placed into a heating box to be heated, after the temperature rises to a preset temperature, standing and thermal insulation are performed for a certain period of time, one hard alloy lining plate is placed on the upper surface or the lower surface of magnesium alloy blank, or the two hard alloy lining plates are placed on the upper surface and the lower surface of the magnesium alloy at the same time, and the hard alloy lining plates and the magnesium alloy are simultaneously fed into the position between rollers so that rolling can be completed. Through the method, the single pass reduction of the magnesium alloy can be greatly increased in the rolling process, the number of rolling passes is decreased, magnesium alloy crystalline grains are thinned, the texture is weakened, magnesium alloy plates with high strength and plasticity are prepared, and the large reduction rolling method for the magnesium alloy is also suitable for the large deformation rolling process of titanium, manganese and metal-matrix composite materials.

The invention discloses a thin strip steel for a thin-wall oil drum and a manufacturing method of the thin strip steel. Double-roll thin strip continuous production is adopted; a dry ice spray mode is adopted after a cast strip is discharged from a crystallization roll; uniform enhanced cooling is performed on the cast strip; the cast strip is quickly cooled to be below 1,280 DEG C; the cooling rate is 200-300 DEG C / s; in such a cooling mode, separation of coarse BN (Boron Nitride) can be promoted and low-melting-point phase B2O3 and fine AlN (Aluminum Nitride) separation are prevented to fulfill the aims of uniformizing austenite crystal grains and reducing the yield ratio; and then austenite is recrystallized and rolled on line, and the strip steel which is subjected to hot rolling is cooled through anti-oxidation quick cooling, wherein the cooling rate is 80-200 DEG C / s and the coiling temperature is 500-600 DEG C. Through the invention, the thin strip steel for the thin-wall oil drum with low yield ratio and superior impact performance can be obtained. According to the thin strip steel for the thin-wall oil drum produced by the method, the hot thin strip steel can be directly used in place of a cold one, a cold rolling step is removed, and the production cost is greatly reduced.