Production method of low-cost X52 pipeline steel and pipeline steel

A production method and technology for pipeline steel, which are applied to the production method of low-cost X52 pipeline steel and the field of pipeline steel, can solve the problems of increased production cost, high price of alloying element Nb, etc., and achieve the effects of strong adaptability and simple production process control.

Active Publication Date: 2014-02-12
攀钢集团西昌钢钒有限公司 +1
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AI-Extracted Technical Summary

Problems solved by technology

However, the alloying element Nb is expensive, whi...
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Method used

Known by above-mentioned exemplary embodiment and comparative example, compared with prior art, adopt X52 pipeline steel of the present invention to not add expensive microalloying element Nb, by the soaking temperature of pipeline steel, rough rolling and The amount of deformation during the finishing rolling process and the cooling rate during rapid cooling are controlled, so as to refine the structure of the pipeline steel, achieve the effect of fine grain strengthening, and obtain a high yield strength, tensile strength, elongation and -20 ℃ Impact work of pipeline steel products. Through the method of the invention, the production cost can be significantly reduced. According to the current price of Nb-Fe containing 60% Nb is 280,000 yuan, the cost is reduced by about 33.6 yuan/ton. The method of the invention has simple production process control and strong adaptability.
[0024] Ti is a strong nitride-forming element, and the melting point of TiN formed is 1400°C. Therefore, TiN can effectively pin ...
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Abstract

The invention provides a production method of a low-cost X52 pipeline steel and a pipeline steel. The production method comprises the following steps: desulphurization, converter smelting and continuous casting are conducted on molten iron to prepare a pipeline steel continuous casting billet; the pipeline steel continuous casting billet is soaked to be at 1160-1200 DEG C, and roughly rolled for 3-7 times by a roughing mill to obtain an intermediate billet; the intermediate billet is finely rolled for 4-7 times by a finishing mill; the finely-rolled pipeline steel is quickly cooled to be at 550-610 DEG C at the cooling speed of 50-100 DEG C/s, and is rolled to obtain a pipeline steel finished product. No Nb is added to the low-cost X52 pipeline steel. Through the adoption of the production method of the low-cost X52 pipeline steel, the production cost of the X52 pipeline steel can be lowered, the production technique control is easy, and the adaptability is high.

Technology Topic

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  • Production method of low-cost X52 pipeline steel and pipeline steel
  • Production method of low-cost X52 pipeline steel and pipeline steel
  • Production method of low-cost X52 pipeline steel and pipeline steel

Examples

  • Experimental program(3)
  • Comparison scheme(1)

Example

[0039] Example 1
[0040] (1) The molten iron is desulfurized, smelted in a converter, and continuously cast into an X52 pipeline steel continuous casting slab. The weight percentage of its chemical composition is shown in Table 1, and the thickness of the continuous casting slab is 230mm.
[0041] (2) Heat the continuous casting slab to 1180°C and carry out rough rolling and finish rolling. The deformation of each pass of rough rolling and finish rolling is shown in Table 2. After rough rolling, the thickness of the middle slab is 59 mm, and the finishing mill The final rolling temperature of the last stand is 760°C, and the thickness of the pipeline steel after finishing rolling is 10.0mm.
[0042] (3) The finished rolled pipeline steel is cooled to 580° C. at a cooling rate of 50° C./s and then coiled to obtain the finished pipeline steel.
[0043] After testing, the mechanical properties of the finished pipeline steel are shown in Table 3.

Example

[0044] Example 2
[0045] (1) The molten iron is desulfurized, smelted in a converter, and continuously cast into an X52 pipeline steel continuous casting slab. The weight percentage of its chemical composition is shown in Table 1, and the thickness of the continuous casting slab is 200mm.
[0046] (2) The continuous casting slab was heated to 1160°C and then rough rolled and finish rolled. The rough rolling and finish rolling passes and the deformation of each pass are shown in Table 2. The thickness of the intermediate slab after rough rolling is 46mm. The final rolling temperature of the last stand of the finishing mill is 780°C, and the thickness of the pipeline steel after finishing rolling is 5.0mm.
[0047] (3) The finished rolled pipeline steel is cooled to 550°C at a cooling rate of 80°C/s and then coiled to obtain the finished pipeline steel.
[0048] After testing, the mechanical properties of the finished pipeline steel are shown in Table 3.

Example

[0049] Example 3
[0050] (1) The molten iron is desulfurized, smelted in a converter, and continuously cast into an X52 pipeline steel continuous casting slab. The weight percentage of its chemical composition is shown in Table 1, and the thickness of the continuous casting slab is 200mm.
[0051] (2) Rough rolling and finish rolling were carried out after the continuous casting slab was heated to 1200°C. The rough rolling and finish rolling passes and the deformation of each pass are shown in Table 2. The thickness of the intermediate slab after rough rolling was 55mm. The final rolling temperature of the last stand of the finishing mill is 800°C, and the thickness of the pipeline steel after finishing rolling is 7.0mm.
[0052] (3) The finished rolled pipeline steel is cooled to 600°C at a cooling rate of 65°C/s and then coiled to obtain the finished pipeline steel.
[0053] After testing, the mechanical properties of the finished pipeline steel are shown in Table 3.
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PUM

PropertyMeasurementUnit
Thickness230.0mm
Thickness200.0mm
Thickness10.0mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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