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X52 pipeline steel and production method thereof

A production method and pipeline steel technology, applied in the direction of temperature control, etc., to achieve high-tech content, good comprehensive performance, and optimized product structure

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 X52 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 0.075wt%, Si 0.20wt%, Mn 1.20wt%, S 0.005wt%, P 0.015wt%, Nb 0.025wt%, Ti 0.015wt%, N 0.007wt%, Als 0.025wt%, the rest is Fe and unavoidable impurity, send into the walking beam type heating furnace that temperature of soaking section is 1220 ℃, heat for 170 minutes, the time of slab in soaking section is 50 minutes, In order to ensure that the Nb and V microalloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and prepared for controlled cooling precipitation after rolling, the internal structure of the slab is uniform, and the furnace is released;

[0040] 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;

[0041] C. Send the descaled slab to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1120°C for 5 passes of continuous rough roll...

Embodiment 2

[0046] A. The slab with the following chemical composition: C 0.07wt%, Si 0.15wt%, Mn 1.10wt%, S 0.006wt%, P 0.02wt%, Nb 0.02wt%, Ti 0.01wt%, N 0.007wt%, Als 0.04wt%, the rest is Fe and unavoidable impurities, sent into the walking beam heating furnace with soaking section temperature of 1200°C, heated for 140 minutes, and the slab was in the soaking section for 40 minutes, In order to ensure that the Nb and V microalloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and prepared for controlled cooling precipitation after rolling, 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 1050°C for 6 passes of continuous rough rolling, ...

Embodiment 3

[0053] A. The slab with the following chemical composition: C 0.09wt%, Si 0.3wt%, Mn 1.3wt%, S 0.007wt%, P 0.017wt%, Nb 0.04wt%, Ti 0.02wt%, N 0.0075wt%, Als 0.01wt%, the rest is Fe and unavoidable impurity, send into the walking beam type heating furnace that temperature of soaking section is 1240 ℃, heat for 220 minutes, the time of slab in soaking section is 60 minutes, In order to ensure that the Nb and V microalloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and prepared for controlled cooling precipitation after rolling, 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 4 passes of continuous rough rolling, ...

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Abstract

The invention provides an X52 pipeline steel and a production method thereof. The X52 pipeline steel comprises the following chemical components: 0.070-0.090wt% of C, 0.15-0.30wt% of Si, 1.10-1.30wt% of Mn, 0.006wt% or more of S, 0.020wt% or more of P, 0.020-0.040wt% of Nb, 0.010-0.020wt% of Ti, 0.008wt% or more of N, 0.010-0.040wt% of Als, the rest of Fe and unavoidable impurities. After heating and descaling, rough rolling and finish rolling are performed on the same dual-frame compact Steckel mill continuously; through delayed rolling control in rolling process, the enhancement function of microalloy elements such as Nb and V added to the steel are given a full play, thereby obtaining superfine and uniform tissue, effectively preventing the occurrence of mixed crystal, and greatly improving the strength and toughness of the X52 pipeline steel. The X52 pipeline steel produced with the method belongs to high-technology product with high additional value, thus the economical benefit is significant.

Description

technical field [0001] The invention relates to an X52 pipeline steel, in particular to an X52 pipeline steel for transporting oil and natural gas 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, X52 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 X52 pipeline steel adopt different processing methods. For example, conventional semi-continuous hot rollin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14B21B37/74
Inventor 张卫强赵宇张红斌李金柱张瑜杜顺林杨奇陈育生杨春雷张志波
Owner WUKUN STEEL
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