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A method for producing energy-saving cold-rolled threaded steel bars for construction

A technology of threaded steel bars and production methods, applied in the direction of metal rolling, etc., to achieve the effects of good market application prospects, reduced resource occupation, and significant economic benefits

Active Publication Date: 2015-11-18
马鞍山延隆新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patents 200810233733, 200810124722, 200810124723 and 201010183312 all proposed production methods for high-strength steel bars, but their characteristics are that hot rolling is used, raw materials contain Mn, Si, and even a certain amount of B, V, and Ti are used for alloying treatment. The strength level is HRB500; although patent 200610125347 proposes a production method of high-strength hot-rolled steel bars with higher strength, the raw material adds a large amount of alloying elements V, Cr, Mo, Ni, etc. on the basis of 20MnSi; patent 200910143268 proposes a A production method of large-diameter high-strength finish-rolled threaded steel bars, the raw material used is Q235B, but the tensile strength that can be achieved is 550MPa

Method used

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  • A method for producing energy-saving cold-rolled threaded steel bars for construction
  • A method for producing energy-saving cold-rolled threaded steel bars for construction
  • A method for producing energy-saving cold-rolled threaded steel bars for construction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Taking the Q235 cold-rolled rebar with a diameter of 12mm as an example, the diameter of the round billet is 15.5mm, and the arrangement of the bending rolls is as follows: figure 1 Way. The performance of the rolled rebar was tested, and the results are shown in Table 1.

[0021] Table 1 Performance comparison of cold-rolled ribbed rebar with a diameter of 12 mm

[0022]

Embodiment 2

[0024] Taking the Q235 cold-rolled rebar with a diameter of 8mm as an example, the diameter of the round billet is 10.5mm, and the arrangement of the bending rolls is as follows: figure 2 Way. The performance of the rolled rebar was tested, and the results are shown in Table 2.

[0025] Table 2 Performance comparison of 8mm diameter cold-rolled ribbed rebar

[0026]

[0027] [Note] Group 1 in Table 1 is the cold-rolled threaded steel bar produced by this technology, and there is no similar product in the market. Group 1 in Table 2 is the cold-rolled rebar produced by this technology, and group 2 is the cold-rolled ribbed rebar of the same specification in the market. Table 2 Since the tensile strength of products of the same specification on the market has not reached above 650MPa, the stress relaxation rate test under 450MPa and 1000h was not carried out.

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Abstract

The invention provides an efficient energy-saving manufacturing method for building-used cold rolling twisted steel, and belongs to the technical field of building-used steel. According to the invention, the bending roll diameter, the bending roll number, and the relative position of the bending roll, the driven roll and the driving roll are controlled, so that mechanical descaling, and big deformation and uniform extension during a cold rolling process are completed, overall reinforcement of the twisted steel section is realized, and residual stress after rolling is reduced; on-line low temperature treatment after rolling is performed to achieve the purpose of improving the impact flexibility of the material and maintaining the strength after cold deformation. The double-rib twisted steel obtained through the manufacturing method, provided by the invention, has tensile strength equal to or higher than 650 MPa, a fracture elongation percentage equal to or higher than 8%, and a stress relaxation rate equal to or lower than 8% under 450 Mpa over 1000 h.

Description

technical field [0001] The invention belongs to the technical field of building steel, and in particular relates to a production technology of energy-saving Q235 steel cold-rolled double-rib threaded steel bar for building. Background technique [0002] With the rapid development of my country's national economy, the construction industry has become one of the industries with large resource consumption. According to statistics, the amount of steel used in my country's construction industry accounts for about 50% of the total steel consumption. To achieve sustainable development, it is necessary to adjust the consumption structure of building materials, vigorously apply high-strength steel bars, and take the road of efficient and economical development. The national "Steel Industry Adjustment and Revitalization Plan" requires the development of high-strength, high-elongation steel for construction, revises relevant technical design specifications, accelerates the elimination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/16
Inventor 隋凤利赵峻朱俊峰左岳马宏伟
Owner 马鞍山延隆新材料科技有限公司
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