1. Shoddy steel easily folded. Folding steel is formed on the surface of a variety of broken line, which runs through the entire product defects often vertical. Arising from the collapse due to shoddy manufacturers to pursue high-efficiency, large reduction, Have a handle, under a rolling generated when folded, bent after the collapse of the product will crack, the big decline in the strength of steel.

2. Shoddy steel frequent appearance Ma surface phenomenon. Ma was due to face serious wear and tear caused by tank rolled steel surfaces of the irregular surface defects. Because of shoddy steel manufacturers to make a profit, often rolling over the rolling groove.

3. shoddy steel surface easy to produce scarring. for two reasons: 1. uneven and shoddy steel materials, and more impurities. 2. shoddy materials manufacturers guide poorly equipped, easy to stick steel, these impurities after the roll bite Easy to produce scarring.

4. Shoddy materials on the surface easy to crack because it is blank bricks, bricks and more stomata, the bricks in the cooling process due to thermal stress The role, resulting in cracks, have been rolling after the crack.

5. Shoddy steel scratches easily, because of inferior equipment manufacturers to build simple, easy to have a burr, scratch Steel surface. Deep scratches to reduce the strength of steel.

6. Non-metallic luster and inferior steel, cast iron or similar Chengdan red color, due to 2.2, its Blank is the bricks. 2, and inferior material rolling temperature is not standard, their steel temperature through the visual, so that's not required to conduct rolling AUSTENITIC region, the natural properties of the steel will not be able to target.

7. shoddy steel bars of the cross-thin and low, often charge the dissatisfied, because the big manufacturers to achieve a negative tolerance, and finished before the reduction of several large iron-partial Small, sufficient dissatisfaction with the pass.

8. Shoddy steel cross section of the oval surface, because the factory in order to save materials and finished products before the roller 2 of the large reduction This strength of steel greatly decreased, but not with the size of standard steel.

9. High-quality steel components of the uniform, cold shear of high-tonnage , The first cut neat and smooth face, and the materials due to poor materials and shoddy, often end in the first cut of meat will be out of the phenomenon, that is uneven, and no metallic luster. But because of inferior wood products manufacturers cut in the first few, there will be big head and tail Handle.

10. Shoddy steel materials containing impurities, the density of steel small size and ultra-poor, so in the absence of vernier caliper, it can be Weighing check. For example, 20 for Steel, the largest national standards laid down in a negative tolerance for 5% of its length when 9M single theoretical weight of 120 kilograms, it should be the minimum weight: 120 X (l-5% ) = 114 kg, weighing out a single than the actual weight of 114 kilograms of small, it is inferior steel, because it exceeds the tolerance of negative 5%. Generally speaking, the entire amount commensurate with the effect will be even better, taking into account the accumulated principal and error On the probability of the problem.

11. Shoddy steel diameter size of the volatile because; l, steel surface temperature instability there is yin and yang. 2, the steel components uneven . 3, due to poor equipment, low-intensity ground, the mill's big bounce. There will be changes in the same week a larger diameter, which reinforced the uniform Shouli Bu easy to break.

; 12.'s trademark high-quality materials and printers are fairly standard.

13. diameter steel three-over 16 thread, the spacing between the two trademarks are over IM .

14. And inferior steel rebar longitudinal reinforcement of the regular-Chengbo Lang.

15. And inferior steel manufacturers in the absence of traffic, so packing is a loose one. Side of the oval-shaped.