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Preparation method for reducing scales generated on surfaces of hot-rolled steel plates

A hot-rolled steel sheet and iron oxide scale technology, which is applied to workpiece surface treatment equipment, metal rolling, metal rolling, etc., can solve the problems of increased production costs of hot-rolled steel sheets, improve toughness and stamping formability, and reduce the number of production. , the effect of increasing the surface area of ​​the strip

Inactive Publication Date: 2011-01-19
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the methods for removing the red scale on the surface of hot-rolled steel sheets mainly include mechanical descaling methods, high-pressure water descaling methods and strictly controlling the Si content in the steel to Si≤0.20%. The increase in the production cost of hot-rolled steel sheets

Method used

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  • Preparation method for reducing scales generated on surfaces of hot-rolled steel plates
  • Preparation method for reducing scales generated on surfaces of hot-rolled steel plates

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Effect test

preparation example Construction

[0026] The chemical composition weight percentage of the hot-rolled steel sheet of the present invention is: 0.05≤C≤0.20%, Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤ 0.12%, P≤0.040%, S≤0.030%, and the balance is iron and unavoidable impurities. The preparation method comprises the following steps: casting slab → heating → descaling with high-pressure water → rough rolling → hot coil box coiling → finishing rolling → cooling → coiling.

[0027] The improvement points of the process part are:

[0028] 1. Heating: Control the furnace temperature to 1150°C-1250°C.

[0029] 2. Finish rolling: the starting rolling temperature is controlled at 950-1050°C, and the finishing rolling temperature is controlled at 830°C-900°C.

[0030] 3. Cooling: the cooling method of fast cooling in the front section + sparse cooling in the back section. Specifically, front stage: cooling to 650-780°C at a cooling rate of 20-60°C / s; rear stage: cooling to 550-650°C at a cooling rate...

Embodiment

[0032] The chemical composition weight percentage of the hot-rolled steel sheet of the present invention is: 0.05≤C≤0.20%, Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤ 0.12%, P≤0.040%, S≤0.030%, and the balance is iron and unavoidable impurities. Melt steel was smelted according to Table 1.

[0033] Table 1 Chemical composition (% by weight) of the hot-rolled steel sheet of the present invention

[0034] serial number

C

Si

mn

P

S

Nb

V

Ti

1

0.15

0.68

1.50

0.018

0.019

0.035

0.075

0.095

2

0.20

0.22

0.92

0.022

0.021

0.086

0.048

0.025

3

0.08

0.51

0.58

0.031

0.008

0.051

0.032

0.074

4

0.05

0.32

2.00

0.015

0.016

0.020

0.050

0.052

5

0.10

0.48

1.35

0.014

0.017

0.029

0.046

0.108

6

...

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Abstract

The invention belongs to the technical field of hot-rolled strips and relates to a method for controlling the surface quality of hot-rolled steel plates, namely a preparation method for reducing scales generated on the surfaces of the hot-rolled steel plates. The chemical components of the steel in the method have wider application range and are especially suitable for the hot-rolled steel platescontaining such microalloying elements as Nb, V, Mn and Si. The hot-rolled steel plates have the following chemical components by weight: not less than 0.05% and not more than 0.20% of C, not more than 0.70% of Si, not less than 0.20% and not more than 2.00% of Mn, not less than 0.02% and not more than 0.10% of Nb, not less than 0.03% and not more than 0.15% of V, not more than 0.12% of Ti, not more than 0.040% of P, not more than 0.030% of S and the balance Fe and inevitable impurities. The control method dispenses with improvement of existing equipment, is simple and controllable in processconditions, realizes the aim of reducing the scales by controlling the slab tapping temperature, the finish rolling, initial rolling and final rolling temperature, the coiling temperature and the cooling method and has the advantages of low energy consumption, low cost and wide applicable scope.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled strips, and relates to a method for controlling the surface quality of hot-rolled steel sheets, that is, a preparation method for reducing the formation of oxide scales on the surface of hot-rolled steel sheets. Hot-rolled steel sheet containing Nb, V, Mn and Si microalloying elements. Background technique [0002] Hot-rolled steel plates are mainly used to make structural parts, such as engineering machinery, steel structures, automobile frames, carriages, etc., which require high strength, toughness, and plasticity of steel plates, and their tensile strength ranges from 370 to 700 MPa. There are many microalloying methods for steel grades. At present, domestic iron and steel enterprises usually use V, Ti, and Nb as microalloying elements to produce hot-rolled steel sheets for automobiles according to their respective resource characteristics and process equipment conditions. Red oxide scales...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21B45/02C22C38/14
Inventor 左军李卫平黄徐晶罗击
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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