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Preparing method of dedicated base material for cold rolling reinforced steel-bar with ribs in low alloy

A cold-rolled ribbed steel bar and low-alloy technology, which is applied in metal rolling and other directions, can solve the problems of inclusions, influence on output and quality, and large dimensional tolerances, achieve complete strength levels and specifications, reduce raw material consumption, The effect of high precision of external dimensions

Inactive Publication Date: 2008-07-30
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the raw materials used in existing cold-rolled ribbed steel bars are low-carbon hot-rolled wire rods for construction, and there are the following problems in the use process: 1) The quality of hot-rolled wire rods is not good, the oxide scale on the surface of the wire rods is thick, and the size tolerance Larger, directly affects the rolling pass rate of cold-rolled ribbed steel bars
2) The chemical composition of the wire rod fluctuates greatly and has high S and P content, and it is easy to segregate and contains inclusions, so that the wire rod often breaks due to composition segregation or high content of inclusions during the drawing process, which affects the cold-rolled ribbed steel bars. The production output affects the product quality of cold-rolled ribbed steel bars
3) The performance of the wire rod is not uniform, so that under normal production conditions, the cold-rolled ribbed steel bar will have a section of qualified and a section of unqualified
4) Low-carbon hot-rolled wire rods for construction cannot meet the needs of producing cold-rolled ribbed steel bars of different strength levels
Due to the above deficiencies, the pass rate of cold-rolled ribbed steel bars is low, which directly affects its output and quality. Therefore, it is necessary to improve the existing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Steel slabs with the following chemical composition: C 0.22wt%, Si 0.60wt%, Mn 1.50wt%, S≤0.035wt%, P≤0.035wt%, the rest is Fe and unavoidable impurities;

[0009] The base material for low-alloy cold-rolled ribbed steel bars is rolled into the following process: put the above-mentioned steel into a heating furnace with a temperature of 1000-1150 ℃, and start rolling when the temperature of the billet reaches 950-1050 ℃, and then rough rolling 6 passes, 6 passes for intermediate rolling, 6 passes for pre-finishing, and then enter the finishing rolling unit for rolling at a temperature of 800-920°C. The wire laying machine spins the silk into loops and spreads it on the Stelmor roller table. The speed of the roller table is 0.20-0.50m / s. Turn on the fan to cool the wire rod temperature from 850-900°C to 680-800°C. The cover makes the wire rod cool slowly, and when the temperature of the wire rod is cooled to 480-650°C, it is coiled to obtain the base metal with the brand...

Embodiment 2

[0011] Get the steel billet of following chemical composition, make low-alloy cold-rolled ribbed steel bar special base material by rolling process identical with embodiment 1: C 0.15wt%, Si 0.30wt%, Mn 1.20wt%, S≤0.035wt% , P≤0.035wt%, and the rest are Fe and unavoidable impurities.

Embodiment 3

[0013] Get the steel billet of following chemical composition, make low-alloy cold-rolled ribbed steel bar special base material by rolling process identical with embodiment 1: C 0.18wt%, Si 0.40wt%, Mn 1.30wt%, S≤0.035wt% , P≤0.035wt%, and the rest are Fe and unavoidable impurities.

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PUM

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Abstract

A mother material dedicated for cold-rolling low-alloy ribbed reinforcing bar contains C (0.15-0.22 Wt %), Si (0.30-0.60), Mn (1.20-1.50), S (0-0.035), P (0-0.035) and Fe (rest). The rolled reinforcing bar features high size precision, surface quality, strength and stability.

Description

technical field [0001] The invention relates to a method for preparing a special base material for low-alloy cold-rolled ribbed steel bars, and belongs to the technical field of design and manufacture of metal materials. Background technique [0002] Cold-rolled ribbed steel bar is a new type of high-efficiency construction steel introduced into my country in the 1980s. It has the characteristics of high strength, strong binding force with concrete, and can save steel and cement. For example, in cast-in-place concrete slabs, using cold-rolled ribbed steel bars can save more than 30% of steel; Improve the quality of concrete, so it is widely used. However, most of the raw materials used in existing cold-rolled ribbed steel bars are low-carbon hot-rolled wire rods for construction, and there are the following problems in the use process: 1) The quality of hot-rolled wire rods is not good, the oxide scale on the surface of the wire rods is thick, and the size tolerance Larger...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04B21B1/16
Inventor 苏鹤洲张卫强王志雄宾石函李金柱杨顺武邓家木李志敏
Owner WUKUN STEEL