How to Identify the Advantages and Disadvantages of Traditional Steel by Intuitive Method

High-quality traditional steel trademarks and printing are more standardized, we usually see signs of ambiguity is likely to be inferior steel, the following Die Steel Co., Ltd. for the sum we summed up how to identify the advantages and disadvantages of ordinary steel through visual identification methods (Non-special steel). A, shoddy steel prone to folding. Folding is the formation of a variety of steel surface polyline, this defect is often throughout the product vertical. The reason for folding is due to the pursuit of high efficiency shoddy manufacturers, the amount of pressure is too large, resulting in ears, the next rolling to produce folding, folded products will break after bending, steel strength decreased. B, shoddy steel surface often have Ma surface phenomenon. Ma surface is due to rolling groove wear caused serious irregular irregularities of steel surface defects. As the shoddy steel manufacturers to pursue profits, rolling groove rolling often exceeded. C, shoddy steel surface is easy to produce scarring. There are two reasons: fake steel material is uneven, many impurities. Shoddy material manufacturers Guiding poorly equipped, easy to stick steel, these impurities bite the roll is easy to produce scarring. D, pseudo-inferior material surface is easy to crack, because it is the blank is adobe, adobe porous, adobe in the process of cooling due to the role of thermal stress, cracks, after rolling cracks. E, shoddy steel is easy to scratch, because shoddy material manufacturers simple equipment, easy to produce glitches, scratch the surface of steel. Deep scratches reduce the strength of the steel. F, shoddy steel without metallic luster, light red or similar pig iron color, there are two reasons: it is a blank billet. Fake and inferior materials rolling temperature is not standard, their steel temperature is through the visual, so can not according to the provisions of the austenitic region rolling, the performance of natural steel can not be achieved. G, shoddy steel bars of fine and low, often appear dissatisfied with the phenomenon, because the manufacturers to achieve a large negative tolerance Angle Drilling machine, finished a few Road before the amount of pressure is too large, small iron type, hole filling dissatisfaction. H, the cross-section of shoddy steel oval, because manufacturers in order to save material, the finished product before the two roll down the volume is too large, the strength of this steel greatly reduced, but also does not meet the screw steel dimensions .

 

I, the composition of high-quality steel uniformity, high-tonnage cold shearing machine, cutting head smooth and tidy end, and inferior materials because of poor material, cutting the end face often have the phenomenon of meat, rugged, and no metallic luster metal drilling machine. And because shoddy products manufacturers cut less head and tail will appear big ears. J, shoddy steel material containing impurities, steel density is too small, and the size of serious tolerance, so in the absence of vernier caliper case, it can be checked for weighing. For example, for rebar 20, the national standard provides a maximum negative tolerance of 5%, length 9M when its single theoretical weight of 120 kg, its minimum weight should be: 120X (L-5%) = 114 kg, Weighing out the actual weight of a single root than 114 kg, it is shoddy steel, because it is more than 5% negative tolerance. Generally speaking Busbar Processing Machine, the whole phase weighing effect will be better, mainly taking into account the cumulative error and probability theory. K, shoddy steel large diameter size fluctuations, due to:? Steel temperature instability with yin and yang side. • The composition of the steel is not uniform. ③ As the equipment is poor, low-intensity foundation, rolling mill bounce steel hole punch machine, there will be a change in diameter within the same week larger, so that the steel is not easy to produce stress fracture. L, 16 large diameter steel thread, the distance between the two trademarks are above the IM. Fake steel rebar is often wavy. Shoddy steel manufacturers because there is no traffic, so relatively loose package, the side was oval.

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