dual inlet fan centrifugal fan

The strength of this rebar is greatly reduced, and it does not meet the standard for rebar size. The side is oval. 5. the composition of steel is not uniform. For example, for rebar 20, the national standard specifies a maximum negative tolerance of 5%. 3, due to the simple equipment, low strength of the foundation, the mill bouncing.  The reason is that: l.4. 2.The size of the internal diameter of the shoddy steel pipe fluctuates greatly. In general, the phasing effect will be better, mainly considering cumulative error and probability theory. . The cross-bar of the shoddy steel pipe is thin and low, and the phenomenon of unsatisfactory filling often occurs. 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 temperature of the steel is unstable and there is a yin and yang surface. In the case of large threads with a diameter of 16 or more, the distance between the two trademarks is more than IM. 3. 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. There will be a large change within the same week, so that the steel reinforcement is not easy to produce fracture. 15. 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 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.

Spurs of steel rebar are often wavy. 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. Its minimum weight should be: 120X (l-5%) = 114 kg, Measuring the actual weight of a centrifugal fan single root smaller than 114 kilograms dual inlet fan is a counterfeit steel because it has a negative tolerance of more than 5%.The trademarks and logos of high-quality tubes are all more standardized

Megosztás a facebookon