How to distinguish the quality of thread steel?
The quality of threaded steel (rebar spot price) can be used to compare intuitive methods to identify, and today we teach you a few quick identification of shoddy steel small trick.1., inferior steel longitudinal reinforcement is often wavy, prone to fold. Folding is due to shoddy manufacturers in pursuit of high efficiency, the amount of pressure is too large, produce handle, a rolling produce folding, folding products after bending cracks, the strength of steel big drop.2. inferior steel appearance often pitted phenomenon. Ma is due to a defect of groove wear caused by irregular rugged steel surface. Due to the inferior steel manufacturers to pursue profits, often rolling groove rolling most standard.
Inferior steel thin and thin, often appear inadequate discontent, because manufacturers in order to achieve large negative tolerance, finished products before a few of the pressure reduction is too large, iron type is small, filled with dissatisfaction.
Inferior steel has no metallic luster and is pale red or similar to pig iron. The reason is two point two. Its billet is adobe. 2, the quality of stainless steel rolling temperature is not standard, their steel temperature is through visual inspection, this can not be rolled according to the provisions of the austenitic region, the performance of steel can not meet the standard.
Due to the fact that the billet is adobe and has many pores, cracks occur in the course of cooling due to thermal stress, and cracks occur after rolling.5. inferior steel due to poor equipment manufacturers, easy to produce burr, scraping the surface of steel. Deep scratches reduce the strength of the steel.
Quality materials are more standardized in terms of trademark and lettering. And inferior steel has no distinct brand mark.
