58results about How to "No white spots" patented technology

Provided are microalloyed mold steel with high purity and a preparation method thereof. The microalloyed mold steel is prepared from, by weight percent, 0.38%-0.48% of C, 1.50%-2.00% of Si, 0.60%-0.80% of Mn, not larger than 0.015% of P, not larger than 0.015% of S, 4.80%-5.80% of Cr, 0.60%-0.90% of Mo, 0.70%-1.00% of W, 0.03%-0.08% of Nb, 0.005%-0.015% of Sr, 0.002%-0.008% of Ca and the balance Fe and inevitable impurities, wherein Sr+Ca is larger than or equal to 0.01%. According to the microalloyed mold steel with high purity and the preparation method thereof, microalloyed ingredients aredesigned, a proper process is used in cooperation, and therefore excellent comprehensive performance and an efficient production process are achieved, and the high-quality mold steel excellent in comprehensive performance, short in production period and low in cost is obtained.

The invention discloses a niobium-titanium-chromium-boron alloyed wear-resistant steel. The niobium-titanium-chromium-boron alloyed wear-resistant steel comprises, by weight, 0.15-0.30% of C, 0.40% orless of Si, 0.60-1.60% of Mn, 0.015% or less of P, 0.0015% of S, 0.010-0.050% of Nb, 0.0025-0.40% of Cr, 0.010-0.040% of Ti, 0.015-0.040% of Als, 0.0025-0.040% of Ni, 0.0010-0.0040% of Cu, 0.0010-0.0050% of Ca, 0.0010-0.0030% of B, 0.006% or less of N, 0.004% or less of O, 0.00020% or less of H, and the balance of iron and inevitable impurities. A preparation method of the niobium-titanium-chromium-boron alloyed wear-resistant steel comprises the following steps: hot metal pretreatment, converter smelting, alloy fine adjustment, LF refining, RH refining, continuous casting, stacking slow cooling, hot rolling, cross cutting and flattening, and heat treatment for obtaining the finished product. The niobium-titanium-chromium-boron alloyed wear-resistant steel is a martensite structure, and has excellent mechanical properties and excellent wear resistance, the Rm value is 1250-1500 MPa, the A50 value is 7-15%, the HBW value is 425-500, the thickness size tolerance is within -0.15 to +0.15mm, and the lowest thickness of a wear-resistant plate produced from the steel can be 2.0 mm.

The invention discloses fragrant artificial leather and a preparation method thereof and relates to the technical field of leather. The fragrant artificial leather comprises a surface layer, wherein a finishing layer is arranged on the surface layer and comprises the components of a controlled-release fragrance finishing agent, a compatilizer and a crosslinking agent, wherein the controlled-release fragrance finishing agent is composed of the components of beta-cyclodextrin and essence, and the compatilizer refers to a water-solubility linear parent high polymer material; the preparation method of the artificial leather comprises the steps of: coating a PVC (Polyvinyl Chloride) or water-based PU surface layer on release paper, and drying the surface layer; coating a PVC (Polyvinyl Chloride) or water-based PU foaming layer on the surface layer, foaming and drying the foaming layer; coating a water-based PU adhesive on the foaming layer, pasting base cloth on the foaming layer with the water-based PU adhesive, drying to obtain an artificial layer; and rolling a layer or multiple layers of water-based PU finishing agent comprising the components of the controlled-release fragrance finishing agent, the compatilizer, the crosslinking agent and a water-based PU finishing agent (water-based polyurethane) on the surface layer of the artificial leather by a three-edition printing machine, and drying to obtain the fragrant artificial leather. The heat resistance and the durability of fragrance volatilization of fragrant artificial leather prepared by the invention are improved, and the fragrance of the fragrant artificial leather is kept above 50% after the fragrant leather is baked for 168h at 100 DEG C.