Example of steel production skills and chemical composition: the bottom of the molten steel through the top blow type converter. In the process of steel removal, the aluminum block and silicon-manganese alloy in the ladle are replaced. The mechanical function index of steel plates with chemical components closely related to glass glaze and steel plates is used to prepare the alloy material for drying and vacuum degassing in the essence process to control the low gas content, after purification, titaniron is used for alloy processing. After the molten steel is fed to SICA wire for disposal and cool-down, it is cast into slabs. In the plate production line hot rolled to the target standard, there are too many high pressure water in the hot rolling process to ensure the surface quality.
After online straightening and cutting, normalize and dispose of the ruler. For details about the chemical composition of steel plates, refer to the selection of normalization skills based on different quality levels of steel plates. The normalization time of Grade B and Grade C steel is shorter. Level D requires strict control of the normalization skills. The statistical results of the tensile and cold bending functions of the steel plate with three thickness standards: tensile function, cold bending function and shock resistance are shown in table 4. A group of impact patience inspection results. -For photos of [Guangdong Oil Tank] Cold Bending test samples, see the description of the fracture of impact samples and tensile samples. For details, see the 22mm thick D-grade steel plate series impact test curves. As shown in table 4 and table 5, the strength of Rolled Sheet Steel is relatively high, but the elongation is slightly lower. The D-grade steel plate obtained after ample normalization has a yield strength of more than 300MPa. It still has an impact patience value far higher than the demand at-25 ℃. It is a comprehensive product with good functions. Compared with Grade D steel, although the application and development of low temperature toughness skills are inferior to those of Grade C steel, the yield strength and tensile strength are slightly higher than that of Grade D steel, it also has the same cold forming function as Grade D steel, because the normalization process is less time, the production cost is much lower than Grade D steel, which is cost-effective for users. The photo shows that the steel sheet has outstanding plasticity at normal temperature and is suitable for Cold Forming and other cold forming processes. It can be seen that the brittle transition temperature of kv2 of the selected D-grade steel plate is about-25 ℃ (exactly the standard Standard D-grade steel plate's shock energy experimental temperature ).
In order to understand the functional status of the steel plate after being burned, take the q245gtc, q245gtd two levels of 16mm, 22mm chemical equipment thickness of the steel plate for the following imitation of the burning disposal: 900 deg C x 10 min air cooling (appropriate for pre-burning) → 940 deg C * 10 min air cooling (appropriate bottom glaze) → 870 deg C * 10 min air cooling (in this temperature successive treatment 3 times, suitable for 3 times ). Then, check the function of the steel plate, as shown in table 6 and table 7. As can be seen from table 6 and table 7, after the above-mentioned burning, the yield strength is still above N/mm2, and the steel plate after burning is still outstanding patience. The q245gtc steel plate with a thickness of 16mm after the above imitation of the burning process is tested. -The [Guangdong Oil Tank] Cold Bending Sample data shows that no matter the C-grade and D-grade steel plates, the normal temperature tensile function after burning is still satisfied with the requirements for the steel plate delivery function in skill conditions. The impact energy value of the D-grade steel plate has not changed much, while the impact energy value of the C-grade steel plate has greatly increased. The temperature of the steel plate after burning is lower than 400 deg C, which has a higher yield strength than 245MPa and an outstanding plasticity. The temperature Skill utilization and development degree exceed 600 ℃, and the intensity value is greatly reduced.
The active welding identification experiment of q245gtd Hefei General Machinery Research Institute used active welding to identify the welding function of q245gtd steel plate of Angang. The welding wire used is h08mna, the standard is 2mm, the welding flux is sj101, the thickness of the selected steel plate is 16mm, and the welding beam is 30 °. According to the requirements of JB4708-2000, the tensile and cold bending experiments were carried out on the joints.
Table 11q245gtd bending experiment RM/mpaa50/% split orientation bending axis diameter bearing distance bending angle back bend and surface bend 480,480,495, 48, 46 base material 64mm66mm180 has carried out the impact experiment of the joint. The results are shown in table 12. the experimental results indicate that the q245gtd steel plate is suitable for active arc welding. -[Guangdong tank]
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