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Production process of wear-resistant X70 pipeline steel plate

A production process and steel plate technology, which is applied in the transportation of solid-liquid two-phase fluid as the medium, and the production technology field of wear-resistant X70 pipeline steel plates, can solve the problems of insufficient wear resistance and other problems, and achieve excellent wear resistance and simple composition design. , the effect of simple production process

Inactive Publication Date: 2014-05-07
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the mechanical strength, toughness index and welding performance of X70 pipeline steel plate are mainly studied. Although the strength level meets the requirements of domestic coal pipeline engineering, it is not excellent in wear resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This example provides a production process of wear-resistant X70 pipeline steel plate. The chemical composition of the obtained pipeline steel plate is calculated by weight percentage: C: 0.05%, Si: 0.35%, Mn: 1.70%, P: 0.013%, S: 0.001%, Nb: 0.03%, Ti: 0.025%, Cr: 0.10%, Alt: 0.06%, and the rest are Fe and unavoidable inclusion elements. Specific requirements are as follows:

[0023] According to the requirements of the chemical composition, the continuous casting slab is obtained through the smelting process, the refining process outside the furnace, the vacuum treatment process and the continuous casting process, and the thickness of the slab is 150mm.

[0024] The slab is produced by a steckel mill production line, including a slab reheating process, a controlled rolling process and a laminar cooling (or ultra-fast cooling) process.

[0025] In the slab reheating process, the temperature before slab heating is 300°C, the slab heating temperature is 1180°C, and the ...

Embodiment 2

[0029] This example provides a production process of wear-resistant X70 pipeline steel plate. The chemical composition of the obtained pipeline steel plate is calculated by weight percentage: C: 0.10%, Si: 0.22%, Mn: 1.20%, P: 0.015%, S: 0.0018%, Nb: 0.06%, Ti: 0.017%, Cr: 0.50%, Alt: 0.04%, and the rest are Fe and unavoidable impurity elements.

[0030] According to the requirements of the chemical composition, the continuous casting slab is obtained through the smelting process, the refining process outside the furnace, the vacuum treatment process and the continuous casting process, and the thickness of the slab is 150 mm. Then use the plate production line to produce the slab, including the slab reheating process, controlled rolling process and laminar cooling (or ultra-fast cooling) process.

[0031] In the slab reheating process, the temperature of the slab before heating is 150°C, the slab heating temperature is 1205°C, and the temperature is kept for 100 minutes; in th...

Embodiment 3

[0034] This example provides a production process of wear-resistant X70 pipeline steel plate. The chemical composition of the obtained pipeline steel plate is calculated by weight percentage: C: 0.08%, Si: 0.10%, Mn: 1.45%, P: 0.007%, S: 0.0005%, Nb: 0.035%, Ti: 0.01%, Cr: 0.48%, Alt: 0.01%, and the rest are Fe and unavoidable impurity elements.

[0035] According to the requirements of the chemical composition, the continuous casting slab is obtained through the smelting process, the refining process outside the furnace, the vacuum treatment process and the continuous casting process, and the thickness of the slab is 150mm. The slab is then produced by using the steel slab production line, including the slab reheating process, controlled rolling process and laminar cooling (or ultra-fast cooling) process.

[0036] In the slab reheating process, the temperature of the slab before heating is 250°C, the slab heating temperature is 1170°C, and the temperature is kept for 70 minut...

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Abstract

The invention discloses a production process of a wear-resistant X70 pipeline steel plate. A slab is obtained through a smelting process, an external refining process, a vacuum treatment process and a continuous casting process. The slab comprises the following chemical components in percentage by weight: 0.05-0.10% of C, 0.10-0.35% of Si, 1.20-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.002% of S, 0.03-0.06% of Nb, 0.01-0.025% of Ti, 0.10-0.50% of Cr, 0.01-0.06% of Alt and the balance of Fe and unavoidable impurities. The slab is prepared into the pipeline steel plate through a reheating process, a controlled rolling process and a cooling process. The strength and toughness of the pipeline steel plate prepared by the invention conform to the technical indexes, and the pipeline steel plate has the advantages of good wear resistance and long service life.

Description

technical field [0001] The invention relates to an X70 pipeline steel plate, in particular to a production process of a wear-resistant X70 pipeline steel plate, which is mainly used in the transportation of solid-liquid two-phase fluid as a medium. Background technique [0002] Long-distance and large-scale pipeline transportation of materials in coal, electric power, metallurgy, petroleum, chemical, building materials and other industries requires a large amount of pipeline steel. Since coal powder, mineral concentrate powder, tailings, cement, ash and other materials have certain abrasive properties, when transported by pipeline, they are mixed with water to prepare slurry and then transported, which will wear the pipeline to a certain extent. Therefore, the steel plate used to manufacture the slurry conveying pipeline must have a certain degree of wear resistance in order to meet the requirements of use. [0003] The X70 grade pipeline commonly used in oil and gas pipeli...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C21D8/02
Inventor 顾鑫姜金星霍松波刘梦冉潘中德曹余良赵显鹏王凡
Owner NANJING IRON & STEEL CO LTD
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