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Clean steel and manufacturing method

A manufacturing method and technology for pure steel, applied in temperature control, metal rolling, etc., can solve problems such as reducing the surface quality of steel, and achieve the effects of high production efficiency, fast continuous casting, and reduced inclusion content

Inactive Publication Date: 2008-01-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it will also reduce the surface quality of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The specific embodiment of the present invention will be introduced below through several groups of different steel grades

[0018] steel number

C

Si

mn

P

S

als

Nb

Ti

N

O

H

Example 1

0.0015

0.02

0.12

0.003

0.0021

0.02

-

0.042

0.0013

0.0018

0.00005

Example 2

0.0019

0.01

0.21

0.0016

0.003

0.043

-

0.048

0.0012

0.0016

0.0001

Example 3

0.0013

0.03

0.28

0.0011

0.0019

0.036

0.025

0.035

0.003

0.002

0.00007

Example 4

0.003

0.01

0.15

0.0013

0.0022

0.05

0.022

0.033

0.0015

0.0019

0.00006

Example 5

0.0012

0.03

0.25

0.0015

0.002

0.049

0.043

0.002

0.003

0.00...

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Abstract

The invention discloses clean steel and its manufacturing method, which comprises the following parts: C<=0.0030%, Si<=0.0030%, 0.10%-0.30%Mn, P<=0.0030%, S<=0.0030, 0.01%-0.06%Al, Ti<=0.09%, Nb<=0.05%, N<=0.0030%, O<=0.0030%, H<=0.0002%, Fe and unavoidable impurity. The method comprises the following steps: desulfurizing hot iron; bessemerizing; refining outside the furnace; casting the middle sheet plate blank continuously; loading hotly and directly; heating the furnace; roughing down; planishing; cooling lamellar flow; batching; cleaning with acid ; rolling coldly; annealing ( flattening; shearing ). The invention reduces the inclusion content in the steel by controlling the proper content of C, Mn, P, S, N, O, and H, which makes the inclusion shape fine and dispersing, the composition homogeneous and the structure homogeneous, and guarantees the integrated property.

Description

technical field [0001] The invention relates to a smelting and rolling process, in particular to a method for manufacturing pure steel. Background technique [0002] The purity of steel is usually evaluated by the content of harmful elements in steel, including P, S, N, H, O (for ultra-low carbon steel C is also used as a harmful element), and the number, shape and size of non-metallic inclusions. When the content of these elements is high, various properties of steel will be reduced, such as tensile strength, toughness, formability, weldability, crack resistance and corrosion resistance, fatigue performance, etc. At the same time, it will also reduce the surface quality of the steel. [0003] With the rapid development of all walks of life, higher requirements are placed on the performance of steel. For example: car panels require C, N, and T.O to be less than 0.0020%, while beverage cans not only require T.O to be less than 0.0020%, but also require that the diameter of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/14C22C33/04C21C7/04B22D11/16C21D8/00B21B1/46B21B37/74
Inventor 史乃安姚伟智张洪峰赵爱英魏元张旭升刘振中刘敏孟献敏
Owner ANGANG STEEL CO LTD
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