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Low cost high performance X70 pipeline steel and production method thereof

A production method and high-performance technology, applied in the field of iron and steel materials, can solve the problems of high price, high cost of pipeline steel, consumption of precious metal resources, etc.

Inactive Publication Date: 2009-01-21
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, molybdenum and nickel are precious metals, which are expensive, so the cost of pipeline steel produced by this alloying method is high and consumes a lot of precious metal resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Implementation 1: The product specification is a hot-rolled pipeline steel coil with a thickness of 7.9 mm and a width of 1550 mm. Its chemical composition is as follows according to weight percentage: C: 0.02%, Si: 0.2%, Mn: 1.40%, V: 0.05%, Nb: 0.040%, Als: 0.020%, B: 0.0005%, Ca / Als≥0.10 , N ≤ 0.0060%, T.O ≤ 0.0030%, P: ≤ 0.012%, S: ≤ 0.006%, the balance Fe. The main production process: molten iron pretreatment, converter smelting, refining outside the furnace, thin slab continuous casting, continuous casting slab heating, rough rolling, finish rolling, coiling. Among them, the thin slab continuous casting process: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is: 1545°C. The molten steel in the tundish is injected into the crystallizer through the flat submerged nozzle. The crystallizer is long funnel-shaped crystallization device; the casting speed of the slab is ...

Embodiment 2

[0029] Implementation 2: The product specifications are pipeline steel hot-rolled coils with a thickness of 7.9 mm and a width of 1550 mm. Its chemical composition is as follows according to weight percentage: C: 0.03%, Si: 0.15%, Mn: 1.45%, V: 0.05, Nb: 0.050%, Als: 0.025, B: 0.001%, Ca / Als≥0.10, N ≤0.0060%, T.O≤0.0030%, P: ≤0.012%, S: ≤0.006%, balance Fe. The main production process: molten iron pretreatment, converter smelting, refining outside the furnace, thin slab continuous casting, continuous casting slab heating, rough rolling, finish rolling, coiling. Among them, the thin slab continuous casting process: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is: 1555°C. The molten steel in the tundish is injected into the crystallizer through the flat submerged nozzle. The crystallizer is long funnel-shaped crystallization device; the casting speed of the slab is 3.5m / min, a...

Embodiment 3

[0030] Implementation 3: The product specifications are pipeline steel hot-rolled coils with a thickness of 10.3 mm and a width of 1550 mm. Its chemical composition is as follows according to weight percentage: C: 0.05%, Si: 0.25%, Mn: 1.7%, V: 0.06%, Nb: 0.060%, Als: 0.035%, B: 0.0025%, Ca / Als≥0.10 , N ≤ 0.0060%, T.O ≤ 0.0030%, P: ≤ 0.012%, S: ≤ 0.006%, the balance Fe. The main production process: molten iron pretreatment, converter smelting, refining outside the furnace, thin slab continuous casting, continuous casting slab heating, rough rolling, finish rolling, coiling. Among them, the thin slab continuous casting process: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is: 1560 ° C. The molten steel in the tundish is injected into the crystallizer through the flat submerged nozzle. The crystallizer is long funnel-shaped crystallization device; the casting speed of the slab...

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Abstract

The invention relates to a low-cost and high-performance X70 pipeline steel and a manufacturing method thereof, which belong to the steel material technical field and are used for solving the problem that production of the pipeline steel consumes noble metals such as molybdenum, nickel and so on. The low-cost and high-performance X70 pipeline steel is characterized by comprising the following main chemical compositions: 0.02 to 0.06 percent of carbon, 0.10 to 0.30 percent of silicon, 1.40 to 1.9 percent of manganese, 0.04 to 0.07 percent of vanadium, 0.040 to 0.070 percent of niobium, 0.020 to 0.040 percent of acid-soluble aluminum, less than or equal to 0.012 percent of phosphor, less than or equal to 0.006 percent of sulfur, and the balance being iron. The formula of the chemical compositions of the X70 pipeline steel adopts the production flow of continuous casting and tandem rolling of thin slabs and thins crystal grains by controlling technological parameters of continuous casting and tandem rolling, so as to achieve the aim of improving the strength and the toughness of the pipeline steel. The X70 pipeline steel produced by the method has high impact toughness; the average grain size is 3.5 micrometers; and the production cost is obviously reduced.

Description

technical field [0001] The invention relates to a structural steel and a production method, in particular to a high-strength, high-toughness ultra-fine grain X70 pipeline steel and a production method, and belongs to the technical field of iron and steel materials. Background technique [0002] Pipeline transportation is the most economical, most convenient and most important transportation method for long-distance transportation of oil and natural gas. In order to reduce the construction investment and operating costs of long-distance oil and gas pipelines and improve transmission efficiency, long-distance oil and gas pipelines are developed in the direction of large diameter and high pressure; in addition, oil and natural gas pipelines are usually located in areas with relatively harsh environments. This requires pipeline steel to have a series of excellent comprehensive properties such as high strength, high toughness, and corrosion resistance. The improvement of these p...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/10
Inventor 冯运莉石焱李杰杨琨杨晓彩
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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