With the development of social economy, our demand for die steel is increasing. Nowadays, die steel material suppliers are everywhere, uneven, and the phenomenon of domestic counterfeit import is very common. What's more, small private steel-making plants are used as high-quality die steel. The quality of die directly affects the quality of pressure processing technology, the accuracy of products, the output and production cost Next, seven and die steel to share with you how to distinguish the quality of die steel.

优良材的商标和印字都比较规范，像我们平时看的标志或许有模糊不清的，有可能是劣质钢。伪劣模具钢的一些特征：

First of all, the trademarks and lettering of high-quality materials are relatively standardized. For example, the signs we usually see may be vague, which may be of poor quality steel. Some characteristics of fake and inferior die steel are as follows

1、伪劣钢材易出现折叠。

1. Fake and inferior steel is easy to fold.

折叠是钢材表面形成的各种折线，这种缺陷往往贯穿整个产品的纵向购买模具钢时,我们应该如何分辨模具钢质量的优劣。产生折叠的原因是由于伪劣厂家追求率，压下量偏大，产生耳子，下一道轧制时就产生折叠，折叠的产品折弯后就会开裂，钢材的强度大下降。

Folding is a variety of broken lines formed on the surface of steel. This kind of defect often runs through the longitudinal direction of the whole product. When purchasing die steel, how should we distinguish the quality of die steel. The reason for folding is that the fake and inferior manufacturers pursue high efficiency, and the reduction is too large, resulting in ears. Folding will occur in the next rolling. The folded products will crack after bending and the strength of the steel will be greatly reduced.

2、伪劣钢材外表经常有麻面现象。

2. The surface of fake and inferior steel is often pitted.

麻面是由于轧槽磨损严重引起钢材表面不规则的凹凸不平的缺陷。由于伪劣钢材厂家要追求利润，经常出现轧槽轧制超标。

Pitting is a kind of irregular and uneven defect on steel surface caused by serious wear of rolling groove. As the manufacturers of fake and inferior steel want to pursue profits, the groove rolling often exceeds the standard.

3、伪劣钢材的横截面呈椭圆形。

3. The cross section of fake and inferior steel is oval.

由于厂家为了节约材料，成品辊前二道的压下量偏大，这种螺纹钢的强度大大地下降，而且也不符合螺纹钢外形尺寸的标准。

In order to save materials, the reduction of the first two passes of the finished roll is too large, so the strength of this kind of rebar is greatly reduced, and it does not conform to the standard of external dimension of rebar.

4、伪劣钢材凹凸不平无光泽。

4. Fake and inferior steel is uneven and lustrous.

钢材的成分均匀，冷剪机的吨位高，切头端面平滑而整齐，而伪劣材由于材质差，切头端面常常会有掉肉的现象，即凹凸不平，并且无金属光泽。而且由于伪劣材厂家产品切头少，头尾会出现大耳子。

The composition of high-quality steel is uniform, the tonnage of cold shear machine is high, and the end face of cutting head is smooth and neat. However, due to poor material quality of fake and inferior materials, the end face of cutting head often has the phenomenon of fleshy, that is, uneven and without metallic luster. And because of the fake and inferior products manufacturers cut less, head and tail will appear big ears.

5、伪劣钢材重量有偏差。

5. There is deviation in the weight of fake and inferior steel.

伪劣钢材材质含杂质多，钢的密度偏小，而且尺寸超差严重，所以在没有游标卡尺的情况下，可以对它进行称量核对。比如对于螺纹钢20，标准中规定负公差为5%，定尺9M时它的单根理论重量为120公斤，它的小的重量应该是：120X(L-5%)=114公斤，称量出来单根的实际重量比114公斤小，则是伪劣钢材，原因是它负公差超过了5%。一般来说整相称量效果会更好，主要考虑到累积误差和概率论这个问题。

Fake and inferior steel material contains many impurities, the density of steel is too small, and the size is out of tolerance seriously, so it can be weighed and checked without vernier caliper. For example, for rebar 20, the national standard stipulates that the maximum negative tolerance is 5%. When the scale is 9m, the theoretical weight of a single bar is 120kg, and its minimum weight should be: 120x (L-5%) = 114kg. If the actual weight of a single bar is smaller than 114kg, it is fake and inferior steel. The reason is that its negative tolerance exceeds 5%. Generally speaking, the whole phase weighing effect will be better, mainly considering the cumulative error and probability theory.

以上就是七和模具钢给大家分享的分辨模具钢质量的优劣的方法。即使是正规的模具钢，也有可能有问题，当然几率很小，正规的销售商出货前都会做探伤测验，可以有效的防止这类问题。希望对大家有所帮助，对模具钢感兴趣的朋友关注：https://www.jnqhmj.com

The above is seven and mold steel to share with you to distinguish the quality of mold steel method. Even if it is a regular mold steel, there may be problems, of course, the probability is very small, regular sellers will do flaw detection test before shipment, which can effectively prevent such problems. Hope to help you, interested in die steel friends pay attention to: https://www.jnqhmj.com