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Production process for high-grade heat insulation pipe

A production process and technology of heat-insulated pipes, which are applied in the field of super-heat-insulated pipe production processes, can solve problems such as welding performance, high impact toughness requirements, large energy consumption, and long production cycle, so as to improve comprehensive performance, improve comprehensive performance, The effect of shortening the production cycle

Inactive Publication Date: 2019-07-16
HEILONGJIANG JIANLONG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to high requirements on product welding performance and impact toughness, high-grade petroleum heat-insulated pipes are generally produced by on-line or off-line heat treatment, which consumes a lot of energy and has a long production cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A high-grade heat insulation pipe production process, the production process includes the following steps:

[0052] Steelmaking production process:

[0053] Step 1: Ladle Preparation

[0054] 1. Purge the breathable bricks to ensure the air permeability of the ladle;

[0055] 2) Clean the ladle so that there is no cold steel at the bottom of the ladle and no residue along the edge of the ladle;

[0056] 3) Use chrome drainage sand and bake it, fill it up and form a protrusion when adding sand;

[0057]Step 2: Converter process

[0058] 1) Loading capacity is 84 tons, end point component control C: 0.135%, P ≤0.012%, temperature: 1625°C;

[0059] 2) Converter tapping, deoxidation alloying, lime top slag addition 400kg / furnace, refining slag 300kg / furnace, aluminum ingot 1.15kg / t, vanadium nitrogen alloy 1.3kg / t, silicon manganese alloy 24 kg / t, silicon Iron 1.5kg / t; guaranteed components for refining C: 0.225%, Si: 0.475%, Mn: 1.53%, P≤0.016%, V: 0.087%, Als: 0.025%...

Embodiment 2

[0090] A high-grade heat insulation pipe production process, the production process includes the following steps:

[0091] Steelmaking production process:

[0092] Step 1: Ladle Preparation

[0093] 1. Purge the breathable bricks to ensure the air permeability of the ladle;

[0094] 2) Clean the ladle so that there is no cold steel at the bottom of the ladle and no residue along the edge of the ladle;

[0095] 3) Use chrome drainage sand and bake it, fill it up and form a protrusion when adding sand;

[0096] Step 2: Converter process

[0097] 1) Loading capacity is 86 tons, end-point component control C: 0.19%, P ≤0.012%, temperature: 1650°C;

[0098] 2) Converter tapping, deoxidation alloying, lime top slag addition 400kg / furnace, refining slag 300kg / furnace, aluminum ingot 1.5kg / t, vanadium-nitrogen alloy 1.3kg / t, silicon-manganese alloy 24 kg / t, silicon Iron 1.5kg / t; guarantee for refining components C: 0.25%, Si: 0.50%, Mn: 1.56%, P≤0.016%, V: 0.099%, Als: 0.040%;

...

Embodiment 3

[0129] A high-grade heat insulation pipe production process, the production process includes the following steps:

[0130] Steelmaking production process:

[0131] Step 1: Ladle Preparation

[0132] 1. Purge the breathable bricks to ensure the air permeability of the ladle;

[0133] 2) Clean the ladle so that there is no cold steel at the bottom of the ladle and no residue along the edge of the ladle;

[0134] 3) Use chrome drainage sand and bake it, fill it up and form a protrusion when adding sand;

[0135] Step 2: Converter process

[0136] 1) Loading capacity is 82 tons, end point component control C: 0.08%, P ≤0.012%, temperature: 1600°C;

[0137] 2) Converter tapping, deoxidation alloying, lime top slag addition 400kg / furnace, refining slag 300kg / furnace, aluminum ingot 0.8kg / t, vanadium nitrogen alloy 1.3kg / t, silicon manganese alloy 24 kg / t, silicon Iron 1.5kg / t; guaranteed components for refining C: 0.20%, Si: 0.45%, Mn: 1.50%, P≤0.016%, V: 0.075%, Als: 0.010%; ...

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PUM

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Abstract

The invention belongs to the technical field of steel production equipment, and particularly relates to a production process for a high-grade heat insulation pipe. A steelmaking production process comprises the following steps of 1, preparation of steel ladles; 2, converter process, which comprises converter tapping, wherein lime top slag addition is 400 kg / furnace, refining slag 300 kg / furnace, aluminum ingots 1.15 kg / t, vanadium-nitrogen alloy 1.3 kg / t, silicon manganese alloy 24 kg / t, ferrosilicon 1.5 kg / t; 3, refining; and 4, continuous casting. A steel rolling production process comprisesthe following steps of 1, blank sizing; 2, heating temperature arrangement of an annular heating furnace; 3, perforation; 4, continuous rolling; 5, stretch reducing; 6, cooling a cooling bed; 7, pipesawing; 8, straightening; 9, carrying out flaw detection; 10, carrying out hydrostatic testing; and 11, diameter checking. According to the production process for the high-grade heat insulation pipe,a proper amount of the vanadium-nitrogen alloy is added into steel, the characteristics of the vanadium-nitrogen alloy are utilized, the precipitation strengthening effect and the fine grain strengthening effect of vanadium are enhanced, and finally the comprehensive performance of the steel pipe is effectively improved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of iron and steel production equipment, and in particular relates to a high-grade heat-insulating pipe production process. [0003] Background technique: [0004] The existing production process of high-grade heat-insulated pipes is: billet sawing-annular heating furnace-perforation-continuous rolling-heat treatment (on-line normalization of heating furnace)-tension reduction-cooling-pipe gang sawing-straightening- Flaw detection - hydrostatic pressure test - diameter - length measurement, weighing, printing - collection and storage. In the production process of the above-mentioned high-grade heat-insulated pipe, heat treatment process is required to achieve the performance index of the steel pipe. For example, heat treatment is required in the process of producing N80-1 oil casing pipe with impact requirements, and the cost of heat treatment production line is relatively high. The energy consumption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C5/28C21C7/00C21C7/06C22C38/02C22C38/04C22C38/06C22C38/12
CPCC21C5/28C21C7/0006C21C7/0056C21C7/06C22C33/06C22C38/02C22C38/04C22C38/06C22C38/12Y02P10/20
Inventor 王营黄晗胥传海李宏波高新起陈慧李利佳
Owner HEILONGJIANG JIANLONG IRON & STEEL
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