Several ways to distinguish counterfeit and inferior steel

1. Counterfeit and inferior steel is prone to folding. Folding is a type of folded line formed by the profile of steel, and this defect often runs through the longitudinal direction of the entire product. The reason for folding is due to the pursuit of high quality by counterfeit manufacturers, resulting in a large amount of pressure and causing ear damage. The folding occurs during the next rolling process, and the folded product will crack after bending, greatly reducing the strength of the steel.

2. Counterfeit and inferior steel often has a rough surface on the outside. Matte surface is a defect caused by severe groove wear, resulting in irregular unevenness and non conformity of the steel profile. Due to the pursuit of profit by manufacturers of counterfeit and inferior steel, there is often a situation where the groove rolling exceeds the standard.

3. Counterfeit and inferior steel materials are prone to scarring. There are two reasons: 1. The material of fake and inferior steel is uneven and contains many impurities. 2. The guide equipment of fake and inferior material manufacturers is simple and easy to stick to steel, and these impurities are prone to scar formation after biting the rolling mill.

4. Overview of counterfeit and inferior materials: Cracks are prone to occur due to the fact that the raw material is adobe, which has many pores. During the cooling process, adobe is subjected to thermal stress, resulting in cracks. After rolling, cracks appear.

5．伪劣钢材轻易刮伤，原因是伪劣材厂家设备简陋，易发生毛刺，刮伤钢材概况。深度刮伤降低钢材的强度。 

6．伪劣钢材无金属光泽，呈淡红色或近似生铁的颜色，原因有两点二、它的坯料是土坯。2、伪劣材轧制的温度不尺度，他们的钢温是经由过程目测的，如许无法按划定的奥氏体区域进行轧制，钢材的机能天然就无法达标。 

7．伪劣钢材的横筋细而低，经常呈现充不满的现象，原因是厂家为达到年夜的负公役，制品前几道的压下量偏年夜，铁型偏小，孔型充不满。 

8．伪劣钢材的横截面呈卵形，原因是厂家为了节约材料，制品辊前二道的压下量偏年夜，这种螺纹钢的强度年夜年夜地下降，并且也不合适螺纹钢外形尺寸的尺度。

9．钢材的成分平均，冷剪机的吨位高，切头端面光滑而整洁，而伪劣材因为材质差，切头端面经常会有失落肉的现象，即凹凸不服，而且无金属光泽。并且因为伪劣材厂家产物切头少，头尾会呈现年夜耳子。 

10．伪劣钢材材质含杂质多，钢的密度偏小，并且尺寸超差严重，所以在没有游标卡尺的环境下，可以对它进行称量查对。好比对于螺纹钢 20，国度尺度中划定zui年夜负公役为 5％，定尺9M时它的单根理论重量为120公斤，它的最小的重量应该是：120X（l－5％）＝114公斤，称量出来单根的现实重量比114公斤小，则是伪劣钢材，原因是它负公役跨越了5％。一般来说整相等量结果会更好，首要考虑到累积误差和概率论这个问题。 

11．伪劣钢材的内径尺寸波动较年夜，原因是；l、钢温不不变有阴阳面。2、钢的成分不平均。3、因为设备简陋，地基强度低，轧机的弹跳年夜。会呈现有统一周内内径转变较年夜，如许的钢筋受力不平均易发生断裂。 

12．材的商标和印字都比力规范。 

13．三钢材直径16以上的年夜螺纹，两商标之间的间距都在IM以上。 

14．伪劣钢材螺纹钢的纵筋经常呈海浪形。

15．伪劣钢材厂家因为没有行车，所以打包比力松散。侧面呈卵形。