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Composite micro-alloying hot rolled steel plate containing V and Nb and preparation method thereof

A hot-rolled steel plate and micro-alloying technology, which is applied in the field of hot-rolled strips, can solve the problems of increased production costs of hot-rolled steel plates, achieve the effects of reducing cooling intensity, reducing the number of production, and improving toughness and stamping performance

Inactive Publication Date: 2010-12-01
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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  • Composite micro-alloying hot rolled steel plate containing V and Nb and preparation method thereof
  • Composite micro-alloying hot rolled steel plate containing V and Nb and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0027] The chemical composition weight percentage of the hot-rolled steel sheet of the present invention is: 0.06%≤C≤0.08%, 0.20<Si≤0.30%, 0.70≤Mn≤0.90%, 0.04<V≤0.05%, 0.02≤Nb≤0.03%, P≤ 0.025%, S≤0.015%, 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.

[0028] The improvement points of the process part are:

[0029] 1. Heating: Control the furnace temperature to 1150°C-1200°C.

[0030] 2. Finish rolling: the starting rolling temperature is controlled at 950-1000°C, and the finishing rolling temperature is controlled at 830°C-850°C.

[0031] 3. Cooling: the cooling method of fast cooling in the front section + sparse cooling in the back section. Specifically, the front stage: cooling to 730-750°C at a cooling rate of 30-40°C / s; the latter stage: cooling to 580-620°C at a cooling r...

Embodiment

[0033] The chemical composition weight percentage of the hot-rolled steel sheet of the present invention is C: 0.06%≤C≤0.08%, 0.20<Si≤0.30%, 0.70≤Mn≤0.90%, 0.04<V≤0.05%, 0.02≤Nb≤0.03%, P ≤0.025%, S≤0.015%, the balance is iron and unavoidable impurities. Melt steel was smelted according to Table 1.

[0034] The chemical composition (weight percent %) of hot-rolled steel plate of the present invention of table 1

[0035] serial number

C

Si

mn

P

S

V

Nb

1

0.07

0.25

0.80

0.019

0.009

0.045

0.025

2

0.08

0.28

0.90

0.012

0.012

0.050

0.030

3

0.06

0.30

0.70

0.016

0.007

0.041

0.022

4

0.07

0.21

0.85

0.017

0.015

0.048

0.020

5

0.06

0.24

0.75

0.012

0.008

0.046

0.026

[0036] The above-mentioned five groups of molten steels were cast ...

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Abstract

The invention belongs to the technical field of hot continuous rolled plate strips, in particular relates to a composite micro-alloying hot rolled steel plate containing V and Nb and a preparation method thereof, which can achieve the purpose of controlling the surface quality thereof. The composite micro-alloying hot rolled steel plate containing V and Nb, which is provided by the invention, not only can reduce the generation of red scales but also can not increase the production cost. The composite micro-alloying hot rolled steel plate comprises the following chemical components in percentage by weight: C which is greater than or equal to 0.06% and is less than or equal to 0.08%, Si which is greater than 0.20% and is less than or equal to 0.30%, Mn which is greater than or equal to 0.70% and is less than or equal to 0.90%, V which is greater than 0.04% and is less than or equal to 0.05%, Nb which is greater than or equal to 0.02% and is less than or equal to 0.03%, P which is less than or equal to 0.025%, S which is less than or equal to 0.015%, and the balance iron and inevitable impurities. The preparation method provided by the invention has no need of reconstructing the existing equipment, has simple and controllable technological conditions, realizes the purpose of reducing the generation of scales by controlling the tapping temperature, the precision rolling temperature, the finishing temperature, the coiling temperature and the cooling mode of a plate blank, and has the advantages of low energy consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of hot continuous rolling strips, in particular to a hot-rolled steel plate containing V and Nb composite microalloying and a preparation method thereof, so as to achieve the purpose of controlling the surface quality thereof. Background technique [0002] Hot-rolled steel plates are mainly used to make structural parts, such as automotive frame longitudinal beams, beams, and carriages. The requirements for the strength, toughness, and plasticity of the steel plate are relatively high, and its tensile strength ranges from 370 to 700 MPa. In recent years, the demand for hot-rolled steel sheets with a strength level of 510MPa and above as automotive structures is increasing. 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....

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/02
Inventor 左军张开华常军叶晓瑜黄徐晶李卫平罗击
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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