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X60 pipe line steel and production method thereof

A technology of pipeline steel and steel plate, applied in the direction of temperature control, etc., to achieve the effect of good comprehensive performance, optimized product structure, and improved strength and toughness

Active Publication Date: 2012-06-27
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 X60 pipeline steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A. The slab with the following chemical composition: C 0.065wt%, Si 0.20wt%, Mn 1.40wt%, S 0.004wt%, P 0.015wt%, Nb 0.040wt%, V 0.045wt%, Ti 0.015wt%, N 0.006wt%, Als 0.025wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1220°C in the soaking section and heated for 180 minutes, in which the slab is in the soaking section The heating time is 45 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;

[0039] 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;

[0040] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1100...

Embodiment 2

[0045] A. The slab with the following chemical composition: C 0.070wt%, Si 0.25wt%, Mn 1.45wt%, S 0.005wt%, P 0.018wt%, Nb 0.045wt%, V 0.040wt%, Ti 0.017wt%, N 0.007wt%, Als 0.030wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1230°C in the soaking section and heated for 200 minutes, in which the slab is in the soaking section The time is 50 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;

[0046] 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;

[0047] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1120°C, cond...

Embodiment 3

[0052] A. The slab with the following chemical composition: C 0.069wt%, Si 0.22wt%, Mn 1.46wt%, S 0.005wt%, P 0.016wt%, Nb 0.047wt%, V 0.041wt%, Ti 0.018wt%, N 0.006wt%, Als 0.033wt%, the rest is Fe and unavoidable impurities; it is sent into a walking beam heating furnace with a temperature of 1240°C in the soaking section and heated for 190 minutes. The time is 50 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;

[0053] 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;

[0054] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1130°C, conduct continuous rough rolling for 5 passes, and open...

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Abstract

The invention provides X60 pipe line steel and a preparation method thereof. The X60 pipe line steel comprises the following chemical components in percentage by weight: 0.060 to 0.080 percent of C, 0.15 to 0.30 percent of Si, 1.35 to 1.55 percent of Mn, less than or equal to 0.006 percent of S, less than or equal to 0.020 percent of P, 0.035 to 0.055 percent of Nb, 0.035 to 0.055 percent of V, 0.010 to 0.025 percent of Ti, less than or equal to 0.008 percent of N, 0.010 to 0.040 percent of Als, and the balance of Fe and inevitable impurities. After heating and descaling, rough rolling and finish rolling are continuously completed on the same steckel mill, the reinforcing effect of Nb, V and other microalloyed elements added in the steel can be sufficiently played by delay controlled rolling in the rolling process, micro-uniform tissues can be obtained, occurrence of mixed crystal can be effectively prevented, and the strength and toughness of the X60 pipe line steel can be greatly improved. The produced X60 pipe line steel belongs to the product with high technology content and high additional value, and has remarkable economic benefit.

Description

technical field [0001] The invention relates to an X60 pipeline steel and a preparation 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 output of pipeline steel has been greatly increased, which has enabled the rapid development of pipeline steel production. X60 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 X60 pipeline steel adopt different processes. For example, the commonly used semi-continuous hot rolling process, the CSP continuous casting and rolling process adopted in the patent applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14B21B37/74
Inventor 赵宇王钧洪汪福成张红斌陈育生杨奇张卫强张瑜张志波杨春雷
Owner WUKUN STEEL
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