Cooling controlling and rolling controlling process for hot-rolled steel bar with rib
A hot-rolled ribbed steel bar, controlled rolling and controlled cooling technology, applied in the direction of temperature control, can solve the problems of small cooling strength, high failure rate of yield strength, easy failure of yield strength, etc., to improve performance and reduce production costs , Obvious economic and social benefits
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Embodiment 1
[0021] C-Mn steel is used to produce HRB335, the steel bar specification is φ12mm, its composition is shown in Table 1 Example 1, the main production process parameters are shown in Table 2 Example 1, and the performance and metallographic structure of the steel bar are shown in Table 3 Example 1. It can be seen from Table 1 that the contents of silicon and manganese in the chemical composition of Example 1 are lower than that of Comparative Example 1. It can be seen from Table 3 that all the mechanical properties of Example 1 are higher than those of Comparative Example 1, and there is no tempering on the steel bar surface organize. It can be seen that, under the condition of ensuring that the mechanical properties meet or exceed the requirements of the national standard, the steel bar produced by the invention can obviously reduce the alloy elements, and the surface layer of the steel bar has no tempered structure.
Embodiment 2
[0023] C-Mn steel is used to produce HRB335, the steel bar specification is φ25mm, its composition is shown in Table 1 Example 2, the main production process parameters are shown in Table 2 Example 2, and the performance and metallographic structure of the steel bar are shown in Table 3 Example 2. It can be seen from Table 1 that the contents of silicon and manganese in the chemical composition of Example 2 are lower than that of Comparative Example 1. It can be seen from Table 3 that all the mechanical properties of Example 2 are higher than those of Comparative Example 1, and there is no tempering on the steel bar surface organize. It can be seen that, under the condition of ensuring that the mechanical properties meet or exceed the requirements of the national standard, the steel bar produced by the invention can obviously reduce the alloy elements, and the surface layer of the steel bar has no tempered structure.
Embodiment 3
[0025]C-Mn steel is used to produce HRB400, the steel bar specification is φ12mm, its composition is shown in Table 1 Example 3, the main production process parameters are shown in Table 2 Example 3, and the performance and metallographic structure of the steel bar are shown in Table 3 Example 3. As can be seen from Table 1, silicon and manganese content are all lower than Comparative Example 2 in the chemical composition of Example 3, and do not need to add vanadium, as can be seen from Table 3, all mechanical properties of Example 3 are all higher than the mechanical properties of Comparative Example 2, And there is no tempering structure on the surface of the steel bar. It can be seen that, under the condition of ensuring that the mechanical properties meet or exceed the requirements of the national standard, the steel bar produced by the invention can obviously reduce the alloy elements, and the surface layer of the steel bar has no tempered structure.
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