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An optimization method for the production process of hot-rolled smooth round steel bar

A technology of production process and optimization method, applied in the field of steel bar rolling, can solve the problems of high cost, near limit, low component ratio of machine components, etc., and achieve the effects of improving strength and toughness, reducing failure rate and high product precision

Active Publication Date: 2020-04-14
YANGCHUN NEW STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the reduction control effect based on the traditional control theory is close to the limit, the machine composition rate is low, and the cost is high. How to reasonably distribute the frame load to control the dimensional stability of the finished steel bar is a key problem that needs to be solved urgently

Method used

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  • An optimization method for the production process of hot-rolled smooth round steel bar
  • An optimization method for the production process of hot-rolled smooth round steel bar
  • An optimization method for the production process of hot-rolled smooth round steel bar

Examples

Experimental program
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Effect test

Embodiment 1

[0032]Taking the φ18mm smooth round steel bar as an example, the method for optimizing the production process of a hot-rolled smooth round steel bar according to the present invention is described. The rough rolling adopts 10 stands, and the finish rolling adopts 6 stands, which include the following steps in turn: billet heating, rough rolling, intermediate rolling, finish rolling, heat treatment, descaling, straightening, flying shear segmentation, sizing, bundling, Inspection and warehousing; the chemical composition of the material of the billet by weight percentage is: C: 0.23-0.25%, Si: 0.25-0.32%, Mn: 1.33%-1.41%, Nb: 0.025%-0.035%, V: 0.05% -0.06%, P≤0.045%, S≤0.045%, the balance is Fe and unavoidable impurities; the reduction load distribution control is carried out during rough rolling, and the specific control methods include:

[0033] Step 1) From the billet size and rough rolling target size, initialize the reduction rate ε of odd groups of racks according to the ...

Embodiment 2

[0049] The optimized process as described in Example 1 includes the following for the weight ratio of materials: C: 0.23-0.25%, Si: 0.25-0.32%, Mn: 1.35%-1.41%, Nb: 0.025%-0.035%, V: 0.05%-0.06%, P≤0.035%, S≤0.035%, Cr0.0004%-0.0008%, the balance is Fe and unavoidable impurities.

[0050] GB / T1499.1-2017 national standard stipulates the relevant technical requirements of hot-rolled steel bar, the present invention sets embodiment and comparative example to measure yield strength and tensile strength index, embodiment and comparative example are set as follows (content is weight percentage):

[0051] Example C Si mn Nb V Cr P S Example 3 0.25 0.31 1.40 0.026 0.06 - 0.022 0.019 Example 4 0.23 0.27 1.37 0.028 0.05 0.00067 0.018 0.021 Example 5 0.23 0.27 1.37 0.028 0.05 0.00054 0.025 0.019 Comparative example 1 0.24 0.31 1.46 0.014 - - 0.020 0.025 Comparative example 2 0.27 0.61 1.49 0.017 0.11 0.12...

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Abstract

The invention discloses an optimization method for a production process of a hot rolled plain round bar. The optimization method comprises the following steps: optimization of a billet material and optimization of a rough milling process. By scientifically selecting the material and distributing a rough milling load rolling reduction reasonably, equipment ability can be utilized more effectively in a same process condition, the rolling energy consumption is reduced, the yielding strength and the tensile strength of the produced bar are improved, and the bar is uniform in texture and precise insection shape and is qualified in various indexes.

Description

technical field [0001] The invention relates to a method for controlling a wire rod rolling process, in particular to a hot-rolled smooth round steel bar rolling process, which belongs to the technical field of steel bar rolling. Background technique [0002] Hot-rolled smooth round steel bars are widely used in the field of civil engineering, and the market demand is very large. In recent years, with the rapid development of the national economy, the output of hot-rolled smooth round steel bars has also increased significantly, accounting for 18% of the entire steel output. Hot-rolled smooth round steel bars have the characteristics of high strength, good comprehensiveness, and steel saving. . [0003] The production process of ordinary hot-rolled smooth round steel bars is very mature, and the raw material factors considered in the design are mainly the content of C, Si, Mn elements and the content of S and P. For example, when the C content is high, the strength of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12B21B1/16B21B37/00
CPCB21B1/163B21B37/00C22C38/02C22C38/04C22C38/12
Inventor 李卫东傅余东欧青红邓冰
Owner YANGCHUN NEW STEEL CO LTD
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