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Spurs of steel rebar are often wavy. . the composition of steel is not uniform.
3. The reason is that the manufacturer has to achieve large negative tolerances, the amount of reduction in the first few passes of the finished product is too large, the iron type is too small, and the hole type is not full. The cross-bar of the shoddy steel pipe is thin and low, and the phenomenon of unsatisfactory filling often occurs. The reason is that: l. For example, for rebar 20, the national standard specifies a maximum negative tolerance of 5%.The composition of high-quality steel is even, the tonnage of the cold shears is high, and the end face of the cutting head is smooth and neat, and the inferiority of the material due to poor quality is often due to the phenomenon of falling meat on the end surface of the cutting head, ie unevenness and no metallic luster. The strength of this rebar is greatly reduced, and it does not meet the standard for rebar size.
4. In the case of large threads with a diameter of 16 or more, the distance between the two trademarks is more than IM. .The size of the internal diameter of the shoddy steel pipe fluctuates greatly.
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8. The side is oval. Its minimum weight should be: 120X (l-5%) = 114 China Mackerel Canned Production Line Suppliers kg, Measuring the actual weight of a single root smaller than 114 kilograms is a counterfeit steel because it has a negative tolerance of more than 5%.
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5. There will be a large change within the same week, so that the steel reinforcement is not easy to produce fracture. In general, the phasing effect will be better, mainly considering cumulative error and probability theory. The shoddy steel pipe manufacturers have looser packing because they have no driving. When the length is 9M, its single theoretical weight is 120 kg. The temperature of the steel is unstable and there is a yin and yang surface. 3, due to the simple equipment, low strength of the foundation, the mill bouncing. 15. The inferior steel pipe material contains many impurities, the density of the steel is small, and the size of the steel pipe is so bad that it can be weighed and checked without a vernier caliper. Moreover, due to the lack of cut-to-size products from manufacturers of inferior and inferior products, big ears will appear at the head and tail.The shoddy steel pipe is elliptical in cross-section because the manufacturer has to reduce the amount of material in front of the roll in order to save material.The trademarks and logos of high-quality tubes are all more standardized.

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These productions need complex production equipments, high cost, resulting in price of nano-nickel powder on the international market price reaches 1200 dollars per kilogram. The total cost of nanosized nickel powder in laboratory preparation is about $ 2,000 per kilogram, and the particle size is difficult to control. It is also difficult to reform scale production.