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Controlling method for reduction of four-strand slitting line differences and structure property differences

A control method and technology of tissue properties, applied in the control field of reducing the difference of the four-wire slicing line and the poor tissue properties, can solve the problems of uneven cooling and poor tissue properties of the four-wire, so as to reduce the poor mechanical properties of the tissue and improve the Stability, the effect of improving cooling uniformity

Active Publication Date: 2013-08-07
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the controlled rolling and controlled cooling process can significantly reduce the amount of microalloying of the material, while improving the strength and toughness of the material. The use of this controlled rolling and controlled cooling technology for steel bar products in large and medium sizes is already mature, but in the case of Φ12mm-Φ14mm four-wire cutting Few of the small specifications have successfully used this technology, mainly because the small specifications have problems such as uneven cooling and poor performance of the four-wire structure.

Method used

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  • Controlling method for reduction of four-strand slitting line differences and structure property differences
  • Controlling method for reduction of four-strand slitting line differences and structure property differences
  • Controlling method for reduction of four-strand slitting line differences and structure property differences

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Experimental program
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Effect test

Embodiment 1

[0026] Attached figure 2 The parameters of the hole type, using the area method to calculate the line difference and K 3 The relationship of filling degree, as shown in Table 1, considers two different conditions of mill bounce of 0 and 0.2mm respectively. as attached image 3 As shown, using the DEFFORM finite element software to simulate and calculate the lower cutting hole K of the casing type 3 The actual fullness L value is 31.8mm. Compared with Table 1, the theoretical line difference at this time is 1523mm (rolling mill bounce is 0) and 1625mm (rolling mill bounce is 0.2). The calculation results show that the design of this set of passes is unreasonable. The line difference is large.

[0027] Table 1 Line difference and K 3 The relationship between the degree of filling (L value)

[0028]

Embodiment 2

[0030] in the attached figure 2 Based on the pass pattern shown, K 6 Hole height changed from 18.5mm to 17.5mm; fixed width hole K 5 Bore changed from 57mm to 58mm; pre-slit K 4 The half-wedge angle of the side walls of the two sidelines is changed from 36.0° to 37.5°; the split hole type K 3 The side wall wedge angle of the two side lines increased from 40.4° to 43.8°, and the line difference and K were calculated by using the area method 3 The relationship between the degree of fullness (L value) is shown in Table 2. Using DEFFORM finite element software to simulate and calculate the lower cutting hole K of the casing type 3 The actual fullness L value is 32.2mm, as attached Figure 4 shown. According to Table 2, the theoretical line difference at this time is -70mm (rolling mill bounce is 0) and -31mm (rolling mill bounce is 0.2).

[0031] Table 2 Line difference and K 3 The relationship between the degree of filling (L value)

[0032]

Embodiment 3

[0034] By adjusting the ring seam value of the cooler after rolling (the horizontal opening of the four-line ring seam is adjusted to 30mm, 38mm, 35mm, and 29mm respectively), the cooling intensity of the two sides is reduced, and the temperature of the upper cooling bed tends to be consistent. After adjustment, the fluctuation value of mechanical properties is significantly reduced. Grade HRB400E, specifications 14mm, the four wires are recorded as 1 # ,2 # 、3 # 、4 # .

[0035] Table 3 Corresponding four-line chemical composition w.t.% of a billet

[0036]

[0037] Table 4 Rolling process parameters

[0038]

[0039] Table 5 The annular gap value and mechanical properties of the four-wire controlled cooling cooler corresponding to a steel billet

[0040]

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Abstract

The invention relates to a controlling method for reduction of four-strand slitting line differences and structure property differences and belongs to the technical field of production of steel for construction steel bars. A relation model of line differences and hole patterns L and a simulating calculation model of the hole pattern filling degree L are built for instructing the hole pattern design effectively. The four-strand difference is -31mm through calculation under the condition that the mill springing is 0.2mm, and accordingly, the test development cycle is decreased greatly, and the test risk and the test cost are reduced; and accidents of wave bending, disorderly steel on cooling beds, steel stacking at flying shearing positions and the like are reduced, and the yield is improved. Besides, by means of a controlled rolling and controlled cooling technology, the usage amount of micro-alloy can be reduced apparently, and the tenacity of materials is enhanced simultaneously. Utilization of the controlled rolling and controlled cooling technology on steel bar products of large and medium specifications is mature, and as for four-strand slitting of steel bar products of small specifications in a range of phi 12mm to phi 14mm, through horizontal adjustment of different circular seam openings of four strands, the four-strand cooling uniformity is improved apparently, and the four-strand structure property stability is improved; and the four-strand yield strength Rel is smaller than or equal to 25 MPa, and the tensile strength is smaller than or equal to 20 MPa.

Description

technical field [0001] The invention belongs to the technical field of steel production for building reinforcement bars. In particular, it relates to a control method for reducing the four-line cutting line difference and poor tissue performance. Background technique [0002] Compared with large specifications (Φ16mm-Φ32mm), small-scale steel products (Φ10mm-Φ14mm) have larger profit margins. The main reason is that small-scale production efficiency is low and production is difficult. The use of multi-line slitting is the most effective way to improve the production efficiency of small sizes. For example, a few manufacturers at home and abroad have realized five-line slitting on Φ10mm specifications, and four-line slitting on Φ12mm-Φ14mm specifications. [0003] However, in the Φ12mm-Φ14mm four-wire slit rolling process, due to the influence of pass system parameters, rolling mill bounce, rolling groove wear and other factors, the dimensions of the rolled parts of each line...

Claims

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Application Information

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IPC IPC(8): B21B37/00
Inventor 邸全康郑福印周玉丽郭新文吴明安李占斌徐兵伟侯栋程四华王晓晨秦延庆李睿英晁月林
Owner SHOUGANG CORPORATION
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