Totally closed electric furnace smelting type screw-thread steel

Abstract

The invention discloses totally closed electric furnace smelting type screw-thread steel including a screw-thread steel main body and an antirust layer cladding the screw-thread steel main body. The antirust layer internally contains zinc, nickel and tin elements, and the screw-thread steel main body comprises, according to the percentage, 0.1-0.2% of C, 0.3-0.8% of Mn, 0.1-0.3 % of Si, 0.01-0.02%of S, 0.02-0.05% of P, 0.5-0.6% of O, 0.001-0.002% of N, 0.2-0.8% of H, and the balance Fe. The screw-thread steel main body is cladded with the antirust layer, so an antirust effect is played; the antirust layer internally contains a proper proportion of the zinc, nickel and tin elements, so that the most appropriate antirust performance is achieved and the reasonable production cost is controlled; with the content setting of 30% of zinc, 25% of nickel and 30% of tin, the cost savings are reasonably controlled while the rust prevention problem can be effectively solved; the screw-thread steel main body comprises, according to the percentage, 0.15% of C, 0.6% of Mn, 0.2% of Si, 0.015% of S, 0.04% of P, 0.55% of O, 0.0012% of N, 0.4% of H, and the balance Fe, so the screw-thread steel hasthe advantages of high toughness, perfect overall function and high practicability.

Description

technical field [0001] The invention relates to the technical field of threaded steel production, in particular to a fully enclosed electric furnace smelting type threaded steel. Background technique [0002] Rebar is a steel bar with ribs on the surface, also known as ribbed steel bar, usually with 2 longitudinal ribs and transverse ribs evenly distributed along the length direction. The shape of the transverse rib is spiral, herringbone and crescent. Expressed in millimeters of nominal diameter. The nominal diameter of a ribbed steel bar is equivalent to the nominal diameter of a smooth round steel bar of equal cross-section. The nominal diameter of the steel bar is 8-50 mm, and the recommended diameters are 8, 12, 16, 20, 25, 32, 40 mm. Ribbed steel bars are mainly subjected to tensile stress in concrete. Due to the effect of the ribs, the ribbed steel bar has a greater bonding capacity with the concrete, so it can better withstand the action of external forces. Ribb...

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Problems solved by technology

[0003] However, in the existing rebar, the electric furnace is semi-closed, the carburizing content is high, the steel bar is relatively brittle, and it is easy to break when used, and the rebar produced is easy to rust, and the overall effect is not good.