600mpa grade and above high-strength building steel bar and its segment application method

Abstract

The invention discloses a high-strength building steel bar of 600 MPa level and above and an application method thereof. : 0.6-1.3%, Mn: 0.4-0.8%, Cr: 0.6-0.7%, Mo: 0.12-0.28%, Ni: 0.3-0.55%, V: 0.2-0.3%, S: <0.05%, P: < 0.02%, the balance is Fe, (1) put the steel bar into the heating furnace for heating; (2) carry out preliminary hot rolling of the steel bar; (3) put the cooled steel bar into the tempering furnace and heat it to 500-550 °C; Steel bars are sprayed with high-pressure water or quenching liquid; (5) inspection and storage are carried out; the invention has strong bearing capacity, improves safety, reduces the number of steel bars used, and reduces costs.

Description

technical field [0001] The invention relates to a manufacturing method and an application method of a steel bar, in particular to a high-strength building steel bar of 600 MPa and above and an application method thereof. Background technique [0002] At present, steel bars for construction are used as steel for concrete structures. Most of the ordinary steel bars are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel bars are widely used in house construction in my country, especially buildings (houses) Due to the low yield strength of the steel bars, the steel bars of the face plate are subjected to artificial active loads during the construction process, and the upper steel bars of the double-layer two-way steel bars are often bent and deformed, which cannot meet the structural restrictions on the protective thickness of the reinforced concrete, resulting in cracks, resulting in engineering Potential quality probl...

AI Technical Summary

Problems solved by technology

[0002] At present, steel bars for construction are used as steel for concrete structures. Most of the ordinary steel bars are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel bars are widely used in house construction in my country, especially for buildings Due to the low yield strength of the steel bars, the steel bars of the face plate are subjected to artificial active loads during the construction process, which often causes the upper steel bars of the double-layer two-way steel bars to be bent and deformed, which cannot meet the structural restrictions on the protective thickness of the reinforced concrete, resulting in cracks, resulting in engineering Potential quality problems, due to the low strength level of steel bars, often limited by factors such as iron burial depth, geological conditions, and subway space, the diameter of the steel bars used is getting thicker and the spacing of the bars is getting denser, which brings about Costs and concrete construction costs have risen, and there are disadvantages such as waste of steel, high cost, and difficulty in bending steel bars.