Production method of Q460C-grade high-strength steel
The invention discloses a production method of Q460C-grade high-strength steel. The production method comprises three procedures namely steelmaking, continuous casting and rolling. According to the production method, the Q460C-grade high-strength steel is produced by adopting a V-N micro-alloying process through a special steelmaking, continuous casting and rolling technology according to the requirements of an iron tower angle iron standard on Q460C-grade iron tower angle iron performances; under the condition that the increasing of an alloy content is little, the strength index of angle iron is improved greatly by adopting a special production process on the premise that the welding performance and the toughness of the angle iron are ensured; the production method has important meaning in the aspect of saving the steel, saving energy and reducing consumption and has obvious economic benefits and technological innovativeness. 1. A Q460C grade high-strength steel producing method, comprising a steel, continuous casting and rolling three procedures of, The steel-making process is: (1) the temperature of molten iron in the furnace> the 1350 [...] , ≤ 0.025%; (2) the temperature control tapping ≤ 1680 [...] ; (3) deoxidizing alloying, alloy and deoxidizing agent adding sequence: a portion of the silicon Ferroaluminium → silicon-manganese alloy → ferro-manganese → vanadium-nitrogen alloy → the remaining Si-al-Fe; deoxidizing alloying and slugging of the argon flow rate accurately stage 50NL/min ﹤Q﹤ 70NL/min; (4) after the rotary furnace smelting, for refining treatment, argon blowing time ≥ 5 minutes, outbound temperature: the temperature of the single the 1585-1600 [...] , continuous casting temperature: the 1570-1585 [...] ; The continuous casting process is: cast the molten steel refining station to the unexcited time control in between 8-15 minutes; crystallizer water weak cold, intensity of cooling to the secondary cooling water than water <1L/kg, the surface temperature of the casting blank two cold sectors ﹤ 1100 [...] , straightening temperature is greater than 900 the [...]. The rolling process is: the rolling temperature system: heating soaking temperature the 1230-1270 [...] , the temperature of the 1080 [...] -1130 the [...] , ≤ 950 the final rolling temperature [...]. 2. Production method according to Claim 1, characterized in that the portion of the silicon in the steel-making process all ferroaluminium silicon Ferroaluminium of the need to add 50%-70%. 3. Production method according to Claim 1, characterized in that the stated Q460C grade high-strength steel of a chemical composition by weight percentage: C0.14-0.19%, Si0 . 15%-0.35%, Mn1 . 20%-1.50%, V0 . 07% -O. 10%, the P [...] 0.025%, S [...] 0.025%, the rest are Fe and impurity elements.