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

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...

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