35results about How to "Content adjustment" patented technology

The invention belongs to the field of alloy steel smelting of iron and steel industries, and particularly provides an extra large high strength steel for a fastening part and a production method. The steel for the fastening part comprises, by mass, 0.43-0.47% of C, no more than 0.10% of Si, 0.60-0.90% of Mn, no more than 0.020% of P, no more than 0.010% of S, 0.02-0.06% of Als, 0.90-1.20% of Cr, 0.30-0.60% of Mo, 0.20-0.50% of V, 0.02-0.06% of Nb, 0.001-0.003% of B, and the balance Fe and unavoidable impurities. The production method of the steel comprises the following steps of molten iron desulfurization, converter smelting, deoxidation alloying, argon blowing, LF furnace treatment, continuous casting, casting blank heating, high line or bar rolling and stelmor control cooling. Steel inclusion produced through the method is low in grade, the extra large high strength steel is uniform in texture, good in cold heading property and hardenability and good in delayed fracture resistance, the tensile strength of wire rods reaches above 850 MPa, the depth of hardening layers of produced products reaches above 10 mm, the problem that the diameter of the large-scale fastening part needs to be increased to meet the tolerance requirements is solved to a certain extent, and the method is suitable for manufacturing the large-scale high strength fastening part.

The invention discloses a hot pressing and sintering manufacturing process of a polycrystalline diamond wire drawing die. The metal powder used includes, by mass percentage: 34-37wt% iron powder, 20-25wt% nickel powder, and 15-19wt% copper powder , 8‑10wt% aluminum powder, 8‑10wt% zinc powder, 1‑2wt% tin powder, 1‑2wt% magnesium powder, 2‑3wt% silver powder, 1‑2wt% phosphorus powder, 2‑ 3wt% zinc-30wt% aluminum master alloy powder. The invention improves the comprehensive performance of the wire drawing die set, so that its compressive strength, hardness, bending strength, impact toughness and wear resistance are all significantly improved. When the die is produced, it can effectively reduce the embrittlement of the die core in the sintering process, Improve the utilization rate of the mold core; during the use of the mold, it can reduce the wear of the mold by hard wire drawing, prolong the service life of the mold, improve the quality of silk products, and reduce the production cost of the enterprise.

The invention discloses the application of a chiral polymer catalyst in an asymmetric reaction, and belongs to the field of material synthesis and application. The phosphine-containing polymer consists of vinyl-containing chiral bidentate phosphine ligand BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) and its derivatives and other vinyl groups It is formed by mixing comonomers. This type of vinyl polymer material has a high specific surface area and a large porosity, and at the same time has excellent thermal stability and chemical stability. One or more of metals Ru, Rh, Ir, Pa, Au and Cu are used as active components in the heterogeneous catalyst. Because the chiral ligands are uniformly embedded and highly dispersed in the polymer skeleton, the dispersion of the metal on the catalyst is higher, and higher catalytic activity is achieved. The heterogeneous catalyst is suitable for various reaction processes such as intermittent tank reaction, continuous fixed bed reaction and trickle bed reaction. When it is applied to catalytic tank type asymmetric hydrogenation reaction, high yield of target product and enantioselectivity greater than 96% can be obtained.

The invention discloses a hot-work die steel. The hot-work die steel consists of the following components in percentage by weight: 0.30 to 0.50 percent of C, 0.80 to 1.20 percent of Si, 1.50 to 1.70 percent of Mn, 4.50 to 5.50 percent of Cr, 1.60 to 2.00 percent of W, 0.10 to 0.30 percent of Mo, 1.60 to 1.80 percent of V, 1.20 to 1.60 percent of Ni, 0.2 to 0.4 percent of Co, 0.5 to 0.7 percent of Nb, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P and the balance of Fe.