Hot rolled ribbed steel bar for 700 MPa-grade high-strength anchor rod and production method
A technology of hot-rolled ribbed steel bars and production methods, which is applied in the field of metallurgy, can solve the problems affecting the normal production and safety of deep wells, and the supporting effect of low-strength anchor rod steel bars cannot meet the requirements, etc., to achieve strong fine-grain strengthening, increase strength, The effect of preventing grain growth
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Embodiment 1
[0017] In this example, the grid of hot-rolled ribbed steel bars for 700MPa-grade high-strength anchor rods is Φ22mm, and its chemical composition and mass percentage are shown in Table 1.
[0018] The production method of the hot-rolled ribbed steel bar for the 700MPa level high-strength anchor rod of this embodiment comprises smelting, refining outside the furnace, continuous casting, billet heating, and rolling operations, and the specific process steps are as follows:
[0019] (1) Smelting process: Converter smelting is adopted, the smelting end point C: 0.14%, P: 0.010%, the end point temperature is 1660°C, ferrosilicon, micro-nitrogen alloy, silicon-manganese alloy and vanadium-nitrogen alloy are added in the tapping process to carry out silicon, manganese, Vanadium alloying, adjusting the chemical composition of molten steel to the lower limit of the target range, argon blowing and stirring throughout the tapping process;
[0020] (2) Out-of-furnace refining process: at...
Embodiment 2
[0026] In this example, the grid of hot-rolled ribbed steel bars for 700MPa grade high-strength anchor rods is Φ20mm, and its chemical composition and mass percentage are shown in Table 1.
[0027] The production method of the hot-rolled ribbed steel bar for the 700MPa level high-strength anchor rod of this embodiment comprises smelting, refining outside the furnace, continuous casting, billet heating, and rolling operations, and the specific process steps are as follows:
[0028] (1) Smelting process: use electric furnace smelting, smelting end point C: 0.08%, P: 0.012%, end point temperature 1640°C, adding ferrosilicon, micro-nitrogen alloy, silicon-manganese alloy and vanadium-nitrogen alloy to carry out silicon, manganese, Vanadium alloying, adjusting the chemical composition of molten steel to the lower limit of the target range, argon blowing and stirring throughout the tapping process;
[0029] (2) Out-of-furnace refining process: at the end of refining, calcium iron wi...
Embodiment 3
[0035] In this example, the grid of hot-rolled ribbed steel bars for 700MPa grade high-strength anchor rods is Φ20mm, and its chemical composition and mass percentage are shown in Table 1.
[0036] The production method of the hot-rolled ribbed steel bar for the 700MPa level high-strength anchor rod of this embodiment comprises smelting, refining outside the furnace, continuous casting, billet heating, and rolling operations, and the specific process steps are as follows:
[0037] (1) Smelting process: Converter smelting is adopted, the smelting end point C: 0.10%, P: 0.008%, and the end point temperature is 1680°C. Ferrosilicon, micro-nitrogen alloy, silicon-manganese alloy and vanadium-nitrogen alloy are added to carry out silicon, manganese, and vanadium nitrogen alloys during the tapping process. Vanadium alloying, adjusting the chemical composition of molten steel to the lower limit of the target range, argon blowing and stirring throughout the tapping process;
[0038] (...
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Abstract
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