How appearance detection of fake and shoddy steel-Hebei zhonghai steel pipe manufacture Co., Ltd.

1. Shoddy steel prone folding. Folding steel is formed on the surface of the dogleg, which are often defective products throughout the vertical. Have folded due to shoddy manufacturers pursuit of high-efficiency, high levels pressure, ear-generated, Under rolling on a folding, folded after bending products will crack, the great strength of steel dropped
2. Shoddy steel appearance often face Ma phenomenon. Pock is rolling groove wear steel caused serious irregular rugged surface defects. As shoddy steel manufacturers to the pursuit of profits, often rolling groove rolling most substandard;
3. Shoddy steel surface easily treated. There are two reasons for (1) shoddy steel materials uneven, more impurities; (2) and inferior materials manufacturers guide poorly equipped, easy sticky steel, these impurities bites roll after easily treated.
4. Shoddy material surface cracks easily because it is the blank adobe, dugouts, porosity, dugouts in the cooling process due to the thermal stress, cracks have, after rolling after its crack.
5. Shoddy steel easily scratched because of the shoddy equipment manufacturers to build simple, easy Burr, the steel scratched the surface. Depth abrasions to reduce the strength of steel.
6. No shoddy steel metallic sheen, similar to maitain light red or the color of pig iron, 2.2 reasons : First, it is blank dugouts. 2 is inferior materials Rolling temperature standards, the steel temperature through visual observation, This can not be provided by the austenitic region of rolling, steel and the performance can not be fulfilled.
7. Wang shoddy steel bars thin and low, often fully with the phenomenon, the reasons for manufacturers to achieve a negative tolerance, Road finished before the pressure for high levels, iron-type is too small, fully pass discontent.
8. Shoddy steel cross convey to the Oval because of the manufacturers in order to save materials and finished products before the two roller pressure of the high levels, The strength of this steel to decline significantly, and does not conform to the size and shape steel standards.
9. Quality steel components uniform, cold shear tonnage, the first end-all smooth and orderly, and because of shoddy materials material difference, Face first cut often swap meat, that is rugged, and no metallic luster. And because shoddy products manufacturers to build smaller crop, there are great incurable handle.
10. Shoddy steel material containing impurities, the density of steel is too small, but super-size worse serious, in the absence of vernier calipers circumstances, it can check for weighing. For those steel-20, the state standard provides the largest negative tolerance of 5% Length 64 when its single theoretical weight of 120 kilograms, the minimum weight is : 120 X (1-5) =114 kilograms, weighing single out the actual weight of 114 kilograms of small, steel is inferior because it held more than 5% tolerance. Generally the whole amount commensurate results will be better, taking into account the accumulated error probability theory and the problem.
11. Shoddy steel diameter size fluctuations, and the reasons are : (a) steel temperature instability of yin and yang surface; (2) Steel Components uneven; (3) simple equipment, and low-intensity ground, the Spring Mill large. While there are within the same week of larger diameter changes, the uniform loading of reinforced easily fracture.
12. Quality build trademarks and printers are relatively standardized.
13. Three steel diameter larger than 16 thread, between the two trademarks in the IM space above.
14. Inferior longitudinal steel steel bars often wavily shape. 15. Shoddy steel manufacturers, no traffic, more loosely packed. Side was the Oval.