Low-cost high-ductility CRB600H steel wire rod and rolling process thereof
A high-ductility, low-cost technology, applied in metal rolling and other directions, can solve the problems of high survival pressure, high production cost, and high price, and achieve the effect of increasing strength and elongation and reducing processing costs
Inactive Publication Date: 2021-01-19
YANCHENG LIANXIN IRON & STEEL CO LTD
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Problems solved by technology
[0003] The traditional hot rolling process is inefficient in producing small-diameter steel bars, and the ways to improve the performance of steel bars are limited, mainly through the improvement of alloy elements, high production costs, and the pressure of weak profits for steel companies to survive, resulting in low market supply and high prices for small-diameter high-strength steel bars. It has always been a bottleneck problem restricting the popularization and application of high-strength steel bars
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[0017] A low-cost and high-ductility circular wire rod for CRB600, the composition and weight percentage of the circular rod are: C content 0.18-0.22%, Si content 0.20-0.30%, Mn content 0.4-0.65%, P content is not more than 0.04%, the S content is not more than 0.04%, and the rest is Fe and unavoidable impurities. The base metal of the round wire rod is smelted in an electric furnace → LF refining → 165 m3 continuous casting slab → high-line controlled rolling and controlled cold rolling. The grade of Panyuan is Q235, base material specification → finished product specification: Φ12→10mm, Φ10→8mm, Φ8→6mm.
[0018] A low-cost high-ductility CRB600 rolling process, which comprises the steps:
[0019] In the first step, the components and their weight percentages are as follows: C content is 0.18-0.22%, Si content is 0.20-0.30%, Mn content is 0.4-0.65%, P content is not more than 0.04%, and S content is not more than 0.04% %, the rest is Fe and unavoidable impurities on-line: p...
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Abstract
The invention relates to the technical field of steel rolling, in particular to a low-cost high-ductility CRB600H steel wire rod and a rolling process thereof. The rolling process comes the followingsteps that S1, the steel wire rod is put on a line; S2, butt welding is conducted through a headless butt welding machine; S3, mechanical descaling is conducted; S4, diameter reduction is carried outon the steel wire rod through a first-pass rolling mill, wherein the diameter reduction ratio is 0.80-0.85; S5, reinforcing steel bars subjected to diameter reduction through the first-pass rolling mill in the step S4 are subjected to diameter reduction and nicking at the same time by means of a second-pass rolling mill, wherein the diameter reduction ratio is 0.63-0.84; S6, tempering heat treatment is conducted on the reinforcing steel bars at the temperature of 500-650 DEG C for 1 to 3 s, wherein the reinforcing steel bars are subjected to the diameter reduction and nicking at the same timethrough the second-pass rolling mill in the step S5; and S7, the reinforcing steel bars subjected to tempering heat treatment in the step S6 are coiled, air-cooled, packaged and warehoused. Accordingto the method, the internal structure and the grain size of a common Q235 hot-rolled wire rod are changed, so that the strength and the elongation of the reinforcing steel bars are remarkably improved, and the cost is low.
Description
technical field [0001] The invention relates to the technical field of steel rolling, in particular to a low-cost high-ductility CRB600H circular wire rod and a rolling process thereof. Background technique [0002] Cold-rolled ribbed steel bar is a new type of building steel that developed rapidly at home and abroad in the late 20th century. Cold-rolled ribbed steel bar is formed by using a hot-rolled disc to reduce the diameter by multi-pass cold rolling, and one rib is pressed and the internal stress is eliminated. A bar with two or three crescents. Because the cold-rolled ribbed steel bar has the characteristics of high strength, good plasticity, easy processing and strong binding force with cement, which can save a lot of steel, the cold-rolled ribbed steel bar is an update of cold-drawn low-carbon steel wire in prestressed concrete members. The replacement product, in the cast-in-place concrete structure, saves steel, and is a better type of cold-processed steel of th...
Claims
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IPC IPC(8): C22C38/02C22C38/04C21D8/08B21B1/18
CPCB21B1/18C21D8/065C21D8/08C22C38/02C22C38/04
Inventor 谢锦官谢吉祥刁承民赵根社谢碧松王康
Owner YANCHENG LIANXIN IRON & STEEL CO LTD