Slab Shearing Knife - Goodklife Patented Material G1
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Author : Mr. Jiang
Update time : 2022-07-28 16:32:32
The wear resistance and precision of cutting tools is crucial for cold thin plate cutting. How about for shearing Slab in high temperature? The first challenge is avoiding knife crack which means the knife should be good enough for its toughness and ductility. Good toughness and ductility are not enough. The knife should also be good for wear resistance. Thus the knife has long work life. In addition, the blade must also have good high temperature resistance. The knife edge cannot be annealed due to high temperature, otherwise the life will be drastically reduced.
H13 (equivalent to DIN 1.2344, W302 Böhler Martin Miller, JIS SKD61) is widely used for shearing Slab all over the world, like Danieli, SMS, etc.
The characteristics of H13 are as following:
> High hardenability and high toughness.
> Excellent thermal crack resistance, water cooling can be used in the work place.
> With moderate wear resistance, carburizing or nitriding can also be used to increase the surface hardness, but the thermal crack resistance should be slightly reduced.
> It has the ability to resist softening at higher temperatures, but the hardness drops rapidly when the use temperature is higher than 540°C (1000°F) (that is, the capable working temperature is 540°C).
> Small deformation in heat treatment.
> Medium and high machinability.
However, with the rapid development of the slab industry, the wear resistance of H13 has long been unable to meet the requirements. In addition, H13 can not meet the shearing conditions under high temperature conditions, and the knives and blades are often unable to continue to be used because of the dropping hardness. For this reason, Goodklife and several university professors developed G1 high-alloy tool steel and obtained a national patent. This material solves the problem of insufficient wear resistance and high temperature resistance of H13. Figure 1 shows the difference of chemical components between G1 and H13. G1 is a ESR remelt high alloy tool steel. The value of P and S is extremely low in G1 material, below 0.0025, while G1 has more W and Ni, which can increase wear resistance and toughness.
H13 (equivalent to DIN 1.2344, W302 Böhler Martin Miller, JIS SKD61) is widely used for shearing Slab all over the world, like Danieli, SMS, etc.
The characteristics of H13 are as following:
> High hardenability and high toughness.
> Excellent thermal crack resistance, water cooling can be used in the work place.
> With moderate wear resistance, carburizing or nitriding can also be used to increase the surface hardness, but the thermal crack resistance should be slightly reduced.
> It has the ability to resist softening at higher temperatures, but the hardness drops rapidly when the use temperature is higher than 540°C (1000°F) (that is, the capable working temperature is 540°C).
> Small deformation in heat treatment.
> Medium and high machinability.
However, with the rapid development of the slab industry, the wear resistance of H13 has long been unable to meet the requirements. In addition, H13 can not meet the shearing conditions under high temperature conditions, and the knives and blades are often unable to continue to be used because of the dropping hardness. For this reason, Goodklife and several university professors developed G1 high-alloy tool steel and obtained a national patent. This material solves the problem of insufficient wear resistance and high temperature resistance of H13. Figure 1 shows the difference of chemical components between G1 and H13. G1 is a ESR remelt high alloy tool steel. The value of P and S is extremely low in G1 material, below 0.0025, while G1 has more W and Ni, which can increase wear resistance and toughness.
Fig. 1 Comparison of Chemical Components between H13 and G1 from Goodklife
The characteristics of G1 are as following:
> Excellent wear resistance.
> Good toughness.
> Good stability in heat treatment.
> Excellent hot hardness (can be used in higher temperature working condition).
> Excellent through-hardening properties.
Since G1 was developed, it has been used all over the world for nearly 20 years. The performance is excellent. Table 1 shows feedback from one of big Steel&Iron companies who use our G1 material regularly.
> Excellent wear resistance.
> Good toughness.
> Good stability in heat treatment.
> Excellent hot hardness (can be used in higher temperature working condition).
> Excellent through-hardening properties.
Since G1 was developed, it has been used all over the world for nearly 20 years. The performance is excellent. Table 1 shows feedback from one of big Steel&Iron companies who use our G1 material regularly.
Table 1 The Performance Comparison Table of Slab Shearing Blade Made of G1 Material from Goodklife
The Case of Table 1
* Case Study: Slab Shearing Knife
* Client: Steel&Iron company (Vietnam)
* Knife dimension: 1800x256.6x100 mm (Upper Knife, Figure 2), 1800x200x100 mm (Bottom Knife, Figure 3)
* Processed material: Slab from thk. 65 mm up to 97 mm.
* Temperature: Min. 825°C to Max. 1125°C
* Shearing Cutting Force: 9000 KN to 13500 KN
* Blade material: G1-ESR, core hardened at 47-50 HRC (HRC 48/49)
Feedback from Client in Vietnam: Comparing with the other two suppliers’ shearing blades, the shearing performance of our G1 blades increased by 250%.
* Case Study: Slab Shearing Knife
* Client: Steel&Iron company (Vietnam)
* Knife dimension: 1800x256.6x100 mm (Upper Knife, Figure 2), 1800x200x100 mm (Bottom Knife, Figure 3)
* Processed material: Slab from thk. 65 mm up to 97 mm.
* Temperature: Min. 825°C to Max. 1125°C
* Shearing Cutting Force: 9000 KN to 13500 KN
* Blade material: G1-ESR, core hardened at 47-50 HRC (HRC 48/49)
Feedback from Client in Vietnam: Comparing with the other two suppliers’ shearing blades, the shearing performance of our G1 blades increased by 250%.
Fig. 2 Slab Shearing Upper Knife from Goodklife
Fig. 3 Slab Shearing Bottom Knife from Goodklife
For more information of our G1 material, you are welcome to contact us anytime. We are also actively looking for broader cooperation. As long as you are a steel mill with a certain scale, a well-known local metal processing or manufacturer, you will have the opportunity to use our G1 sample products for free.
