• Improper welding of X80 pipeline may cause cracks
• Brief introduction of API X52 pipeline steel
• The difference between PSL1 and PSL2
• Harm of inclusions in X70 pipeline steel
• API 5L pipeline pipe
• X52 steel plate surface quality standards that need to be met
• The basic production process of API 5L X60 pipeline steel
• The key to Q460D steel welding process
• What does the heat treatment of Q690 Steel include?
• Reasons for choosing Q690D steel

Influence of Improper Heat Treatment Process Operation on NM500

What kind of impact will it have on NM500 wear-resistant plate when the heat treatment operation is improper? This article summarizes the following five main situations:
1.Quenching cracking. This kind of situation is generally seen more often. Quenching cracks of NM500 wear-resistant plate are mostly caused by improper cooling operation during cold treatment or excessive heating during heating. It may also be related to the design factors of the NM500 wear-resistant plate.

2.Insufficient hardness. For the insufficient hardness of NM500 wear-resistant plate, it may be caused by improper control of quenching temperature during heat treatment. Too high or too low quenching temperature of NM500 wear-resistant plate will cause insufficient hardness. In addition, it may be related to the tempering temperature setting for NM500 wear-resistant plate. At the same time, the pre-cooling time is too long during cooling or the cooling medium is not selected properly.

3.Appearance deformation. It is difficult to ensure the good shape of NM500 wear-resistant plate during the heat treatment process. Generally, the shape deformation is related to the large and small martensitic phase transformation.

4.Insufficient toughness. This phenomenon is generally caused by the high quenching temperature of NM500 wear-resistant plate and the long time of maintaining high temperature. Or caused by improper tempering operation.

5. Decarburization. mainly refers to the phenomenon that part or all of the carbon on the surface of NM500 wear-resistant plate is lost during the heating or heat preservation process of the NM500 wear-resistant plate. This phenomenon generally has a relatively large impact on the performance of NM500 wear-resistant plates.