摘要:
A chromium steel alloy having 0.4 to 0.75% of carbon, 0.4 to 1.6% of manganese, 12 to 19% of chromium, up to 0.2% of nickel, up to 0.7% of silicon, 0.5 to 1.5% of molybdenum, up to 1.5% of tungsten, 0.05 to 0.3% of vanadium and (% Ti/% Nb), 0.02 to 0.15% of sulfur, up to 0.1% of nitrogen and up to 0.008% of boron, remainder iron including smelting-related impurities. This steel alloy is distinguished by good processability, resistance to corrosion, resistance to abrasion, a high resistance to heat up to 300° C. and above, and a high rigidity.
摘要:
A process for separating a liquid eutectic mixture by crystallization of one eutectic forming substance of the mixture on a cold surface to which seed crystals of the eutectic forming substance have been applied in the form of a seed crystal layer, and subsequent removal of the eutectic forming substance in liquid form after heating of the surface.
摘要:
The combination of valves consists of a double passage cross-over spherical valve with which at least one other single passage spherical valve is connected in series. The passage of the cross-over spherical valve under high pressure is connected to the partition column of a gas chromatograph or liquid chromatograph while the other passage is intended for introducing the sample and is under atmospheric pressure when the sample is injected.
摘要:
Copolymers of(A) perfluoroalkylethyl acrylate C.sub.n F.sub.2n+1 CH.sub.2 CH.sub.2 OCOCH.dbd.CH.sub.2(b) higher alkyl acrylate C.sub.m H.sub.2m+1 OCOCH.dbd.CH.sub.2(c) vinylidene chloride CH.sub.2 .dbd.CCl.sub.2(D) acroylbutylurethane CH.sub.2 .dbd.CH--CONHCOOC.sub.4 H.sub.9 at the weight ratio of 1(A) : 0.22-0.39(B) : 0.45-0.85(C) : 0.01-0.15(D) n being 6, 8, 10, 12 or 14 and m being a number from 10 to 16.They are prepared by conventional methods for preparing copolymers and are used as oil - and water repellents for porous materials, especially textile materials.