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X46 pipeline steel and preparation method thereof

A pipeline steel and steel plate technology, applied in the field of X46 pipeline steel, to achieve significant economic benefits, high added value, and good overall performance

Active Publication Date: 2012-07-04
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 X46 pipeline steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A. The slab with the following chemical composition: C 0.08wt%, Si 0.22wt%, Mn 1.15wt%, S 0.006wt%, P 0.019wt%, Nb 0.028wt%, Ti 0.016wt%, Als 0.028wt%, The rest is Fe and unavoidable impurities; it is sent to a walking beam heating furnace with a temperature of 1220°C in the soaking section and heated for 195 minutes, of which the heating time of the slab in the soaking section is 45 minutes to ensure that the slab 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;

[0040] B. Use high-pressure water with a pressure of 18MPa to spray and descale the front and back sides of the slab out of the furnace for 12 seconds;

[0041] C. Send the descaled slab to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1110°C for 5 passes...

Embodiment 2

[0046] A. The slab with the following chemical composition: C 0.07wt%, Si 0.15wt%, Mn 1.10wt%, S 0.005wt%, P 0.018wt%, Nb 0.02wt%, Ti 0.01wt%, Als 0.01wt%, The rest is Fe and unavoidable impurities; it is sent to a walking beam heating furnace with a temperature of 1200°C in the soaking section, and heated for 220 minutes, and the heating time of the slab in the soaking section is 60 minutes to ensure that the slab 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;

[0047] 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;

[0048] C. Send the descaled slab to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1080°C for 4 passes of con...

Embodiment 3

[0053] A. The slab with the following chemical composition: C 0.09wt%, Si 0.3wt%, Mn 1.3wt%, S 0.0055wt%, P 0.017wt%, Nb 0.04wt%, Ti 0.02wt%, Als 0.04wt%, The rest is Fe and unavoidable impurities; it is sent to a walking beam heating furnace with a temperature of 1240°C in the soaking section and heated for 120 minutes, of which the heating time of the slab in the soaking section is 40 minutes to ensure that the slab 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;

[0054] 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;

[0055] C. Send the descaled slab to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1150°C for 6 passes of ...

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Abstract

The invention provides an X46 pipeline steel and a preparation method thereof. The X46 pipeline steel comprises the following chemical components in percentage by weight: 0.070-0.010% of C, 0.10-0.30% of Si, 1.10-1.30% of Mn, at most 0.008% of S, at most 0.022% of P, 0.015-0.030% of Nb, 0.008-0.025% of Ti, 0.010-0.040% of Als and the balance of Fe and inevitable impurities. The preparation methodcomprises the following steps: after heating and descaling, continuously completing rough rolling and finish rolling on the same double-frame compact type Steckel mill. The time delay rolling controlin the rolling process fully displays the reinforcing effect of Nb, V and other microalloying elements added in steel, and the obtained structure is fine and uniform. The invention effectively prevents appearance of mixed crystals, and greatly enhances the strength and toughness of the X46 pipeline steel. The X46 pipeline steel produced by the method belongs to a high-tech product with high addedvalue and obvious economic benefit.

Description

technical field [0001] The invention relates to an X46 pipeline steel, in particular to an X46 pipeline steel used for producing oil and gas transmission pipes 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, X46 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 X46 pipeline steel adopt different processing methods. For example, conventional semi-continuo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 张志波张红斌张瑜杨春雷曹占元张卫强陈育生杨奇李金柱杜顺林
Owner WUKUN STEEL
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