Production process for low-cost and highly-clean X80 pipeline steel

A technology with high cleanliness and production process, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve the problems of delayed production time, converter slag entering ladle, consumption of aluminum, etc. The effect of large promotion value

Active Publication Date: 2014-09-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in most cases, the oxygen content in the steel and slag at the end of the converter is high; some converter slag will enter the ladle when the converter is tapping
The X80 pipeline steel deoxidizer is generally aluminum, which will consume a large amount of aluminum
In this way, it will bring higher deoxidation cost; and when LF furnace slagging, one or two adjustments are needed to achieve the target slag system, which delays the production time and makes the production rhythm unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Its process route includes: molten iron pretreatment → converter blowing → converter tapping deoxidation and alloying → slag removal → LF furnace refining → RH refining → continuous casting

[0046] Specifically follow the steps below:

[0047] (1) Hot metal pretreatment:

[0048] Remove the S content in the molten iron to S≤0.005%;

[0049] (2) Converter blowing:

[0050] Add ferromolybdenum 4kg / t steel, nickel plate 3 kg / t steel, copper plate 2kg / t steel with scrap steel, and tap when the following conditions are met: C ≤0.05%, P ≤0.015%;

[0051] (3) Deoxidation and alloying of converter tapping:

[0052] Add silicon-containing alloys as the main deoxidizer to remove oxygen in steel and alloy other elements, including Mn and Cr;

[0053] (4) Remove slag after tapping until the slag cannot cover the liquid steel surface; add refining slag ≥ 10kg / t steel after removing slag, and the composition of refining slag is (by mass percentage):

[0054] CaO: 53%, Al2O3:...

Embodiment 2

[0061] Its process route includes: molten iron pretreatment → converter blowing → converter tapping deoxidation and alloying → slag removal → LF furnace refining → continuous casting

[0062] Specifically follow the steps below:

[0063] (1) Hot metal pretreatment:

[0064] Remove the S content in the molten iron to S≤0.005%;

[0065] (2) Converter blowing:

[0066] Add ferromolybdenum 3.5kg / t steel, nickel plate 3.0 kg / t steel, copper plate 2.5kg / t steel with scrap steel, and tap when the following conditions are met: C ≤0.05%, P ≤0.015%;

[0067] (3) Deoxidation and alloying of converter tapping:

[0068] Add silicon-containing alloys as the main deoxidizer to remove oxygen in steel and alloy other elements, including Mn and Cr;

[0069] (4) Remove slag after tapping to make the slag thickness ≤ 30mm; add aluminum 0.4kg / t steel after removing slag; then add refining slag 18kg / t steel, the composition of refining slag is (by mass percentage):

[0070] CaO: 60%, Al2O3: 18%,...

Embodiment 3

[0077] The process route is: molten iron pretreatment → converter blowing → converter tapping deoxidation and alloying → slag removal → LF furnace refining → RH refining → continuous casting

[0078] Specifically follow the steps below:

[0079] (1) Hot metal pretreatment:

[0080] Remove the S content in the molten iron to S≤0.005%;

[0081] (2) Converter blowing:

[0082] Load molten iron 950kg / t molten steel, scrap steel 100kg / t molten steel, ferromolybdenum 4.5kg / t steel, tap when the following conditions are met: C ≤0.05%, P ≤0.013%;

[0083] (3) Deoxidation and alloying of converter tapping:

[0084] Use ferrosilicon as the main deoxidizer to remove oxygen in steel, and add medium manganese 10kg / t steel, metal manganese 8kg / t steel, and alloy other elements, including Mn and Cr;

[0085] (4) Remove slag after tapping to make the slag thickness ≤ 25mm; add aluminum 0.1kg / t steel after removing slag; then add refining slag 10kg / t steel, the composition of refining slag...

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Abstract

The invention discloses a production process for low-cost and highly-clean X80 pipeline steel and specifically discloses the production process for the X80 pipeline steel with a small usage amount of smelting aluminum and total oxygen T[O] of no more than 15 ppm. The process route of the production process comprises the following procedures: pretreatment of molten iron; converter smelting; converter tapping, deoxidation and alloying; slag removal; LF furnace refining; RH refining; and continuous casting; wherein the RH refining is optional. Cheap ferrosilicon is used as a main deoxidizer during tapping and alloying, so deoxidation cost is reduced; slag removal is carried out after converter tapping, then prefabricated refining slag is added, so rapid and accurate slagging is facilitated. The production process provided by the invention has low deoxidation cost, enables LF treatment to be more standard and faster and is favorable for faster, high-quality and stable production of the X80 pipeline steel.

Description

technical field [0001] The invention relates to a low-cost, high-cleanliness X80 pipeline steel production process, in particular to the X80 pipeline steel production process with less aluminum consumption and total oxygen T[O] in the steel less than or equal to 15ppm. Background technique [0002] High grade X80 pipeline steel requires low P and high cleanliness. However, in most cases, the oxygen content in the steel and slag at the end of the converter is high; some converter slag will enter the ladle when the converter is tapping. The X80 pipeline steel deoxidizer is generally aluminum, which will consume a large amount of aluminum. In this way, it will bring higher deoxidation cost; and when LF furnace slagging, one or two adjustments are needed to achieve the target slag system, which delays the production time and makes the production rhythm unstable. Contents of the invention [0003] The purpose of the present invention is to provide a low-cost, high-cleanliness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/06
CPCY02P10/20
Inventor 刘轶良
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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