Manufacturing technique of low compression ratio high grade pipe line steel

A technology with low compression ratio and production process, which is applied in the field of high-strength low-alloy steel production process, and can solve the problems of difficult production line and failure to produce thick-gauge pipeline steel.

Inactive Publication Date: 2007-03-14
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the traditional concept, the production of pipeline steel must ensure a compression ratio greater than 10. In this case, the production line with thinner continuous casting slabs has no ability to produce thick specification pipeline steel. ...

Method used

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  • Manufacturing technique of low compression ratio high grade pipe line steel
  • Manufacturing technique of low compression ratio high grade pipe line steel
  • Manufacturing technique of low compression ratio high grade pipe line steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment is a specific production process of pipeline steel X70 with a compression ratio of 6.9. The selected process is suitable for the production of X70 pipeline steel in the steckel mill. The thickness of the billet is 150mm, the thickness of the finished plate is 21-21.5mm, the range of compression ratio is 6.9-7.1, and the total deformation is ≤85%.

[0030] Smelting: The metallurgical process of pure steel, ultra-low P, and extremely low S is adopted to ensure the uniformity of the structure of the continuous casting slab. The design range of the main chemical composition of the steel is shown in Table 1:

[0031] C

[0032] Steel is refined after smelting. The slab continuous casting strictly controls the defects of the slab, such as porosity and segregation, which should be controlled below B 0.5 level. The continuous casting slab adopts the cooling method of pile cooling to reduce the hydrogen content in the continuous casting slab and minim...

Embodiment 2

[0042] This embodiment is a specific production process of pipeline steel X70 with a compression ratio of about 8.5. The selected process is suitable for the production of X70 pipeline steel by the steckel mill. The thickness of the billet is about 150mm, the thickness of the finished plate is about 17-17.5mm, the range of compression ratio is 8.2-8.6, and the total deformation is ≤89%.

[0043] Smelting: The metallurgical process of pure steel, ultra-low P, and extremely low S is adopted to ensure the uniformity of the continuous casting slab. The main chemical composition design range is shown in Table 3:

[0044] C

Si

mn

P

S

Nb

Ti

Mo

0.03~0.0

6

0.15-0.3

1.55~1.6

5

＜0.01

＜0.002

0.03~0.05

0.015~0.02

5

0.15-0.2

5

[0045] Steel is refined after smelting. The slab continuous casting strictly controls the defects of the slab, su...

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Abstract

The invention relates to a method for producing high-strength low-alloy steel. Wherein, it comprises smelting, refining, casting sheet blank, heating blank, removing phosphor, cooling and flattening; the smelting step uses pure steel, low phosphor, and low sulfur; in the casting step, the loose of blank and the aliquation are lower than B0.5level; in the heating step, vanadium+niobium+ titanium0.15%, nickel+chromium+copper<=0.50%, and the heating temperature is 1180-1220Deg. C; in the thermal rolling step, in the crystallize process, the deformation temperature is 1070-1000Deg. C, the deformation amount is 40-60%, and the rolling speed is 1.5-2.5m/s, and in the second step that rolling the non-crystallized area, the pressure is 200-400MPa, the rolling speed is 5-1.5m/s, and the deformation amount is 60-75%; and the interlayer cooling speed in the cooling step is 15Deg. C/s-25Deg. C/s.

Description

technical field [0001] The invention relates to a production process of high-strength low-alloy steel, in particular to a production process of high-grade pipeline steel with low compression ratio. Background technique [0002] Natural gas resources are mostly concentrated in oceans, hills, deserts, plateaus and alpine regions, far away from the consumer market. In order to reduce luck costs and enhance market competitiveness, pipeline design and construction must develop in the direction of large diameter, high steel grade, thick pipe wall, and high delivery pressure. With the construction of long-distance gas pipelines, the understanding of pipeline safety and high-quality materials is becoming more and more profound. Generally speaking, long-distance gas pipelines are often accompanied by large-diameter, high-pressure transmission, and thick-walled characteristics. Correspondingly, the requirements for high toughness and high strength are put forward for coils, especiall...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B37/58B21B37/46B21B37/48B22D11/124C21D11/00C21D9/70C22C1/02
Inventor 王道远康永林姚永宽黄一新于浩尹雨群谯明亮李翔牛涛祝瑞荣楚觉飞
Owner NANJING IRON & STEEL CO LTD
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