Process method for solving cracks of high-strength steel casting blank
A process method and high-strength steel technology, applied in the field of metallurgical industry production
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0065] Embodiment 1, measured temperature distribution:
[0066] After the slab leaves the continuous casting machine and cuts → stacks and waits → before entering the heating furnace, the actual measured temperature of the upper surface, corner, end face, and narrow face of the slab is as follows: image 3 with Figure 4 shown. image 3 with Figure 4 It is the test results of two pieces with different billet numbers. The results of the two tests were basically the same.
Embodiment 2
[0067] Embodiment 2, the thermal conductivity of billet:
[0068] The thermal conductivity of the high-strength steel slab was measured by the LFA 427 laser thermal conductivity meter for the continuous casting slab produced by the above process. The results show that the thermal conductivity of the high-strength steel fluctuates when the slab is cooled from 1000°C to 50°C. The range is 26.69~14.28W / (m·K) (the unit of thermal conductivity is watt / m·Kelvin). As the temperature decreases, the thermal conductivity of the slab presents an alternating pattern of decrease→increase→decrease→increase. When the temperature is 735°C and the temperature is 398°C, the thermal conductivity is 14.29W / (m·K) and 17.18W, respectively. / (m·K), the thermal conductivity becomes significantly smaller, and the stress release becomes weaker, which is the temperature point where cracks occur. Therefore, the use of hot rolling can avoid alternating changes in stress and reduce cracks.
Embodiment 3
[0069] Embodiment 3, the main chemical composition of embodiment casting slab and the ratio of casting slab cracking:
[0070] The main chemical composition of the continuous casting slab produced by the above process meets the control requirements, and the casting slab has no cracks and cracking defects. Referring to the following table (before and after optimization in the table is before and after implementing the present invention):
[0071] Example C％ Si% Mn% P％ S％ Als% H / ppm Slab Cracking Ratio% 1 after optimization 0.142 1.11 1.73 0.010 0.0005 0.49 1.0 0 2 after optimization 0.139 1.14 1.71 0.013 0.0007 0.47 1.2 0 3 after optimization 0.133 1.24 1.80 0.012 0.0007 0.49 0.8 0 4 after optimization 0.136 1.26 1.81 0.0084 0.0006 0.51 0.9 0 5 before optimization 0.151 1.25 1.83 0.013 0.0054 0.53 1.8 87.5％ 6 before optimization 0.14 1.17 1.72 0.012 0.0031 0.45 2.1 100％
PUM
| Property | Measurement | Unit |
|---|---|---|
| Thermal conductivity | aaaaa | aaaaa |
| Thermal conductivity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More