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X56 pipeline steel and production method thereof

A production method and pipeline steel technology are applied in the field of metal material processing and forming to achieve the effects of preventing mixed crystals, significant economic benefits and high added value

Active Publication Date: 2010-12-01
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no precedent for how to continuously complete rough rolling, intermediate rolling and finishing rolling on a two-stand compact steckel mill to produce high-strength and high-toughness X56 pipeline steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A. The slab with the following chemical composition: C 0.06wt%, Si 0.2wt%, Mn 1.3wt%, S 0.007wt%, P 0.018wt%, Nb 0.035wt%, V 0.02wt%, Ti 0.01wt%, N 0.007wt%, Als 0.01wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1210°C in the soaking section and heated for 230 minutes. The period of time is 60 minutes to ensure that the Nb and V microalloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and the controlled cooling precipitation after rolling is prepared, the internal structure of the slab is uniform, and the furnace is released;

[0050] B. Use high-pressure water with a pressure of 17MPa to spray and descale the front and back sides of the slab out of the furnace for 13 seconds;

[0051] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1060°C for 4 passes of continuous rough rolling. At t...

Embodiment 2

[0056] A. The slab with the following chemical composition: C 0.09wt%, Si 0.3wt%, Mn 1.5wt%, S 0.008wt%, P 0.016wt%, Nb 0.055wt%, V 0.04wt%, Ti 0.22wt%, N 0.008wt%, Als 0.04wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1250°C in the soaking section and heated for 130 minutes. The period of time is 40 minutes to ensure that the Nb and V micro-alloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and the controlled cooling precipitation after rolling is prepared, the internal structure of the slab is uniform, and the furnace is released;

[0057] B. Use high-pressure water with a pressure of 15MPa to spray and descale the front and back sides of the slab out of the furnace for 15 seconds;

[0058]C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1160°C for 4 passes of continuous rough rolling. At t...

Embodiment 3

[0063] A. The slab with the following chemical composition: C 0.07wt%, Si 0.25wt%, Mn 1.4wt%, S 0.007wt%, P 0.017wt%, Nb 0.045wt%, V 0.03wt%, Ti 0.018wt%, N 0.008wt%, Als 0.02wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1200°C in the soaking section and heated for 185 minutes. The time of the section is 50 minutes to ensure that the Nb and V microalloys precipitated in the steel slab are fully re-dissolved, the austenite grains are refined and the controlled cooling precipitation after rolling is prepared, the internal structure of the slab is uniform, and the furnace is released;

[0064] B. Use high-pressure water with a pressure of 20MPa to spray and descale the front and back sides of the slab out of the furnace for 10 seconds;

[0065] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1100°C for 4 passes of continuous rough ...

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Abstract

The invention provides X56 pipeline steel and a production method thereof. The X56 pipeline steel comprises the following chemical components: 0.060-0.090wt% of C, 0.20-0.30wt% of Si, 1.30-1.50wt% of Mn, not more than 0.008wt% of S, not more than 0.020wt% of P, 0.035-0.055wt% of Nb, 0.020-0.040wt% of V, 0.010-0.022wt% of Ti, not more than 0.008wt% of N, 0.010-0.040wt% of Als and the balance Fe and inevitable impurities. The production method is characterized by continuously finishing rough rolling and finish rolling on the same double-stand compact steckel mill after heating and descaling. The X56 pipeline steel has the following advantages: the strengthening effects of the microalloying elements added to the steel, such as Nb, V and the like are brought into full play through delay rolling control in the rolling process and the superfine and uniform structure is obtained, thus effectively preventing mixed crystals and greatly improving the strength and toughness of the X56 pipeline steel; and the X56 pipeline steel produced by the method has high-tech content, high added value and obvious economic benefits.

Description

technical field [0001] The invention relates to an X56 pipeline steel and a production method thereof, belonging to the technical field of metal material processing and forming. Background technique [0002] Pipeline transportation of oil and gas has the characteristics of high efficiency, economy, safety, and no pollution. It is the most effective tool for oil and gas transportation. In recent years, with the rapid development of pipeline engineering, the production of pipeline steel has been greatly increased, and the production of pipeline steel has developed rapidly. Among them, X56 grade pipeline steel is a common steel grade for pipeline engineering, especially branch line engineering, and its production technology has been greatly developed. At present, domestic enterprises producing X56 pipeline steel adopt different processing methods. For example, conventional semi-continuous hot rolling process, CSP continuous casting and rolling process, medium plate production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 张红斌赵宇张瑜张志波杨春雷张卫强李金柱杜顺林陈育生杨奇
Owner WUKUN STEEL
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