Changzhou YingYuan teach you to identify fake steel pipe

 
1 high quality tube trademark and printing are standard.
Vertical bars 2 inferior steel rebar often wavy.
3 fake steel pipe manufacturer with no driving, so pack is loose. The oval.
4 fake steel pipe material containing more impurities, steel density small, and size of tolerance are serious, so in no vernier caliper, it can check for weighing. As of 20 steel, national standard maximum negative tolerance is 5%, length 9M single theory its weight is 120 kilograms, the minimum weight should be: 120X (L 5%) =114 kg, actual weighing out single than 114 kg, is inferior steel, the reason is it has more than 5% negative tolerance. Generally speaking the whole amount to match the effect will be better, mainly considering the cumulative error and probability theory to the problem.
5 fake steel pipe diameter fluctuation is bigger, the reason is; L, steel temperature instability have a yin and Yang surface. 2, the composition of the steel is not uniform. 3, due to poor equipment, the foundation strength is low, the mill spring big. Appear to have the same week varies greatly, the stress is not uniform easily broken.
6 fake steel pipe surface easy generation scarring. There are two reasons: (1). Fake steel pipe material is not uniform, impurities. 2. Shoddy material manufacturers guide simple equipment, easy to stick steel, these impurities bite after roll easy generation scarring.
Crack is easy to produce 7 fake wood surface, the reason is its stock is adobe, adobe air, Adobe during cooling due to the action of thermal stress, crack, after rolling with crack.
Folding line pipe is formed on the surface of the longitudinal, the defects often throughout the entire product. Folding is due to shoddy manufacturers to pursue high efficiency, reduction slants big, produce Erzi, a rolling produce fold, folding products after bending cracks, the strength of steel big drop.
8 fake steel pipe appearance often pitted phenomenon.
Pits is due to defects of rolling groove wear caused by irregular rugged steel surface. Due to shoddy steel manufacturers to the pursuit of profit, often appear groove rolling exceed the standard.
The cross section of 9 false and inferior Steel Oval, the reason is the manufacturers in order to save materials, finished products and the first two reduction slants big, this kind of steel strength greatly reduced, but also does not conform to the standard size rebar appearance.
10 high quality steel components uniform, cold shear tonnage is high, the cutting head face is smooth and neat, and the inferior material because of poor material, cutting head face often meat off phenomenon, namely is uneven, and no metallic luster. And because the false and inferior material manufacturers cut less head, head and tail will appear Erzi big.
11 three pipe diameter of more than 16 of the big screw, the distance between two trademark above IM.
12 fake steel pipe easily scratch, the reason is fake steel pipe factory equipment simple, easy to produce burr, scratching the surface of steel. The depth of scratches to reduce the strength of steel.
13 fake steel pipe without metallic luster, reddish or similar iron color, there are two point two reasons, it is the billets adobe. 2, and inferior material rolling temperature not standard, their steel temperature is through the visual, it can not according to the provisions of the austenite region of steel rolling, the performance of natural cannot reach.
Transverse bars 14 false and inferior steel fine and low, often filled phenomenon, reason is the manufacturer to the large negative tolerance, finished the previous reduction slants big, iron small, hole filled.
15 fake steel pipe easy folding.
(editor :admin)