What are the rules of sampling for raw iron analysis instruments?
After the specimen is mixed, the specimen is collected in a clean container. The same batch of samples is called equal quality, the total weight is about 45g, and the mixture is divided into 10! 15g is used to determine the composition of carbon, and the remaining 30~35g is crushed in hardened steel bowl or in his sample preparation equipment. To prevent the sample is too small, while beating the side sieve. Sample screening must be used to close screen cover, with the exemption like fine powder loss. The specimen shall pass all the required sieve holes. Malleable cast steel shot because chip into thin slices and not by all the provisions of the sieve, to film thickness impact screen aperture is less than the specified or not affect the analysis of melting sample, sieve specimens can be according to the provisions of the processing by sieve, sieve directly mixed in the samples. The size of the sample is determined according to the determination method. The standard method is that the conventional component is 60 mesh; the rapid analysis of the conventional component is 80`100; the burning method of carbon analysis is about 20 mesh (but sieve).
You can't use the ordinary drill to drill the body sample of Hua Xin pig iron analysis instrumentHard iron tools, drills can not drill, can be embedded with carbide blade carbide drill, or use silicon carbide grinding wheel from the longitudinal section of the specimen to steal slices. When the flakes are removed from the surface, they are smashed to 20 meshes, and the same batch of debris is called equal quality. The total weight is about 40g. Preparation of specimens for quenching steel bowl preparation equipment in other fire and make all break through 100 mesh screen. The pig iron sample can also be annealed and softened by heat treatment (the annealing temperature is about 850 DEG C). Then drilling samples are made according to the drilling method.
Clean the surface of pig iron by wire brush or grinding wheel, and drill vertically at the center of the bottom of the sample or near the center. Bit diameter of not less than 10mm, remove the sample surface of about 5mm, drilling to the bottom of the hole from the other side of the 5mm so far. If the hole, slag or other impurities are found within the drilled hole or in the borehole, it is drilled again parallel to the original hole at the location adjacent to the original hole. When drilling, the drilling speed and bit speed are not too fast, and the speed is generally under 200r/min. Avoid drilling cuttings too thick or oxidative deterioration. Attention should be paid to keeping the drill sharp and not causing the dispersion loss of the sample. For a sample of larger size, it can be drilled in 3 locations, and the edge of the hole shall not be less than 5mm. From three the cuttings in ChinaResearch mixed mortar. If the sample is very hard, can not drill, specimens can be broken up, with four points and divided, finally mortar grinding, so that all the samples through 100 mesh sieve.
