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A kind of production method of boron-containing pipe steel strip

A production method and tube steel technology are applied in the production field of boron-containing tube-making steel strip, which can solve the problems of low product quality stability, long production cycle, low yield of boron-containing tube-making steel strip, etc. Good, high production efficiency, excellent quality effect

Active Publication Date: 2015-10-07
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the production of boron-containing pipe steel strips usually uses ordinary rolling processes. Considering the particularity of boron, ordinary rolling process production not only has poor adaptability, long production cycle, and high cost; and the boron-containing pipe steel produced The product quality stability of the belt is not high, and the finished product rate is low

Method used

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  • A kind of production method of boron-containing pipe steel strip
  • A kind of production method of boron-containing pipe steel strip
  • A kind of production method of boron-containing pipe steel strip

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Technological process: top-bottom double-blown oxygen converter smelting→LF refining→CSP thin slab continuous casting and rolling→cooling→coiling;

[0037] (2) Chemical composition: see Table 1 for chemical composition ratio;

[0038] (3) See Table 2 for CSP continuous casting and rolling process parameters.

[0039] The mechanical properties of the boron-containing pipe-making steel strip produced in Example 1 are shown in Table 3.

Embodiment 2

[0041] (1) Technological process: top-bottom double-blown oxygen converter smelting→LF refining→CSP thin slab continuous casting and rolling→cooling→coiling;

[0042] (2) Chemical composition: see Table 1 for chemical composition ratio;

[0043] (3) See Table 2 for CSP continuous casting and rolling process parameters.

[0044] The mechanical properties of the boron-containing pipe-making steel strip produced in Example 2 are shown in Table 3.

Embodiment 3

[0046] (1) Technological process: top-bottom double-blown oxygen converter smelting→LF refining→CSP thin slab continuous casting and rolling→cooling→coiling;

[0047] (2) Chemical composition: see Table 1 for chemical composition ratio;

[0048] (3) See Table 2 for CSP continuous casting and rolling process parameters.

[0049] The mechanical properties of the boron-containing pipe-making steel strip produced in Example 3 are shown in Table 3.

[0050] The chemical composition of the boron-containing pipe-making steel strip of Embodiment 1-3 of the present invention is shown in Table 1, the process parameters of Embodiment 1-3 are shown in Table 2, the mechanical properties of Embodiment 1-3 are shown in Table 3, and the product thickness specifications are respectively 5.0, 7.9 and 12.5mm.

[0051] Table 1 Example 1-3 Chemical composition of boron-containing pipe steel strip (wt%)

[0052] serial number

B

C

Si

mn

P

S

N

Ti

als

...

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Abstract

The invention discloses a production method of a boron-containing tube-making steel band. The boron-containing tube-making steel band comprises the following components in percentage by weight: 0.0008-0.0028% of B, at most 0.19%% of C, 0.15-0.35% of Si, at most 1.53% of Mn, at most 0.015% of P, at most 0.010% of S, at most 0.0045% of N, 0.023-0.032% of Als, 0.015-0.020% of Ti, and the balance of iron and inevitable impurities. The production method of the boron-containing tube-making steel band comprises the following steps: smelting, LF refinment, continuous casting and continuous rolling of CSP sheet billet, cooling and coiling. By matching the specific steel grade composition design with the CSP continuous casting and continuous rolling technique, the production method has the advantages of favorable technical adaptability, low energy consumption and high production efficiency; and the product has the advantages of favorable shape, high yield, high dimensional accuracy, stable performance and the like.

Description

technical field [0001] The invention relates to the field of iron and steel production, in particular to a production method of a boron-containing pipe-making steel strip. Background technique [0002] Boron has many characteristics different from other alloy elements in improving hardenability, mainly including: [0003] (1) The ability to improve hardenability is extremely strong. The effect of 0.0010% ~ 0.0030% boron can be equivalent to the effect of 0.60% manganese, 0.7% chromium, 0.5% molybdenum and 1.5% nickel respectively, so its ability to improve hardenability is hundreds or even thousands of times that of the above alloy elements , so only a very small amount of boron can save a lot of precious alloying elements. [0004] (2) It has an optimal content and this content is extremely small. Generally, the effect of alloying elements to improve hardenability increases with the increase of their content in steel, but boron has an optimal content range, too much or t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14B22D11/18C21D8/02
Inventor 章海王立涛饶添荣胡学文王莹王宗明杨兴亮
Owner MAGANG (GROUP) HOLDING CO LTD