Dedicated base material for making nails and cold rolling reinforced steel bar with ribs

A cold-rolled ribbed steel bar and base metal technology, applied in metal rolling and other directions, can solve the problems of inclusions, affecting output and quality, easy segregation, etc. The effect of engineering quality

Inactive Publication Date: 2006-04-19
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 p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Steel slabs with the following chemical composition: C 0.16wt%, Si 0.30wt%, Mn 0.60wt%, S≤0.035wt%, P≤0.035wt%, the rest is Fe and unavoidable impurities;

[0011] The base material for nail making and cold-rolled ribbed steel bar is rolled into the following process: put the above-mentioned steel into a heating furnace with a temperature of 1000-1150°C, and start rolling when the billet temperature reaches 950-1050°C. 6 passes of rolling, 6 passes of intermediate rolling, 6 passes of pre-finishing, and rolling in the finish rolling unit at a temperature of 800-920°C. Spin the wire into coils from the laying machine and spread 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. Close the fan above the blower. All the covers make the wire rod cool slowly, and when the temperature of the wire rod is cooled to 480-650°C, coiling is carried out to obtain the base materia...

Embodiment 2

[0013] Get the steel billet of following chemical composition, make nail making and cold-rolled ribbed reinforcing bar special base material by rolling process identical with embodiment 1: C 0.07wt%, Si 0.10wt%, Mn 0.30wt%, S≤0.035wt %, P≤0.035wt%, and the rest is Fe and unavoidable impurities.

Embodiment 3

[0015] Get the steel billet of following chemical composition, make nail making and cold-rolled ribbed reinforcing bar special base material by rolling process identical with embodiment 1: C 0.12wt%, Si 0.20wt%, Mn 0.45wt%, S≤0.035wt %, P≤0.035wt%, and the rest is Fe and unavoidable impurities.

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PUM

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Abstract

A mother material dedicated for making nails and cold-rolling low-alloy ribbed reinforcing bar contains C (0.07-0.16 Wt %), Si (0.10-0.30), Mn (0.30-0.60), 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 special base material for nail making and cold-rolled ribbed steel bar, which 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, directly affec...

Claims

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Application Information

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IPC IPC(8): C22C38/04B21B1/16
Inventor 张卫强苏鹤洲王志雄李金柱张强杨顺武邓家木李志敏
Owner WUKUN STEEL
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