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Normalized cryogenic steel at temperature of -50 DEG C and manufacturing method thereof

A low-temperature steel and normalizing technology, applied in the field of construction, can solve problems such as low strength and coarse ferrite grains

Active Publication Date: 2018-01-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Liang Pengyue and others published in "Pressure Vessel" in 1992 entitled "Development of 0.5Ni Low Temperature Steel" and Zhang Xinghua published in "Big Nitrogen Fertilizer" in 1998 entitled "Application of Domestic 0.5Ni Low Temperature Steel in Large-scale Synthetic Ammonia Plant" The article mentions that the 09MnNiDR steel used in low temperature environments above -60°C has a disadvantage of low strength, and there are no chemical elements for grain refinement in the steel, resulting in coarse ferrite grains

Method used

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  • Normalized cryogenic steel at temperature of -50 DEG C and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]100 tons of oxygen top-blown converter is used for smelting, and the position of the gun is well controlled during the blowing process to achieve good slag in the process and coordinated carbon temperature;

[0042] The reduced slag made by LF furnace is desulfurized to reduce inclusions and adjust the composition. The holding time of VD furnace is 18min. Determination of H, O content, [H] = 1.0ppm, [O] = 15ppm;

[0043] Mold slag is selected for continuous casting, the whole process is protected and poured, and the billet size is 300mm;

[0044] The slab enters the slow cooling pit for slow cooling, and after the slow cooling, it is quickly cleaned up, and the cleaning temperature is 180°C;

[0045] Two-stage controlled rolling, the first-stage rolling temperature is 1100°C, the second-stage rolling temperature is 900°C, air-cooled after rolling, and the thickness of the steel plate is 30mm;

[0046] Heat treatment: normalizing + tempering heat treatment is adopted, ...

Embodiment 2

[0048] 100 tons of oxygen top-blown converter is used for smelting, and the position of the gun is well controlled during the blowing process to achieve good slag in the process and coordinated carbon temperature;

[0049] The reduced slag made by LF furnace is desulfurized to reduce inclusions and adjust the composition. The holding time of VD furnace is 15min. Determination of H, O content, [H] = 1.2ppm, [O] = 18ppm;

[0050] Mold slag is selected for continuous casting, the whole process is protected and poured, and the billet size is 300mm;

[0051] The slab enters the slow cooling pit for slow cooling, and after the slow cooling, it is cleaned by rushing temperature, and the cleaning temperature is 170°C;

[0052] Two-stage controlled rolling, the first-stage rolling temperature is 1080°C, the second-stage rolling temperature is 910°C, air-cooled after rolling, and the thickness of the steel plate is 30mm;

[0053] Heat treatment, using normalizing + tempering heat tre...

Embodiment 3

[0055] 100 tons of oxygen top-blown converter is used for smelting, and the position of the gun is well controlled during the blowing process to achieve good slag in the process and coordinated carbon temperature;

[0056] The reduced slag made by LF furnace is desulfurized to reduce inclusions and adjust the composition. The holding time of VD furnace is 17min. Determination of H, O content, [H] = 1.0ppm, [O] = 16ppm;

[0057] Mold slag is selected for continuous casting, the whole process is protected and poured, and the billet size is 300mm;

[0058] The slab enters the slow cooling pit for slow cooling, and after the slow cooling, it is cleaned at a temperature of 165°C;

[0059] Two-stage controlled rolling, the first-stage rolling temperature is 1060°C, the second-stage rolling temperature is 890°C, air-cooled after rolling, and the thickness of the steel plate is 30mm;

[0060] The heat treatment adopts normalizing + tempering heat treatment, put the steel plate at r...

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Abstract

The invention provides a steel for normalizing -50°C low temperature. The composition of the steel plate is as follows by weight percentage: C: 0.09%-0.15%, Si: 0.16%-0.50%, Mn: 0.60%-1.18%, Ni: 0.10 %~0.50%, Mo: 0.01%~0.09%, Cr: 0.15%~0.30%, V: 0.06%~0.10%, Ti: 0.015%~0.030%, S: ≤0.005%, P: ≤0.008%, remainder The amount is Fe and unavoidable impurities, Ceq≤0.36. Manufacturing method: converter smelting, refining, continuous casting, slow cooling of slab, cleaning, rolling, heat treatment. Adopting the invention to produce low-temperature steel has yield strength ≥ 350MPa, tensile strength 500-630MPa, elongation ≥ 25%, and the strength is about 15% higher than that of 09MnNiDR steel of the same level.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to the construction of low-temperature storage tanks and the like. Background technique [0002] Low-temperature steel is mainly used to make equipment for storing and transporting various types of liquefied gases, including liquefied petroleum gas, liquefied ethylene gas, and liquid ammonia, etc. Low-temperature steel usually requires high strength and good low-temperature impact toughness. In recent years, with the rapid development of my country's petroleum and chemical industries and the rapid increase in the demand for clean energy worldwide, the demand for such low-temperature steel is increasing. [0003] Low-temperature steel includes austenitic low-temperature steel and ferritic low-temperature steel. Ferritic low-alloy low-temperature steel is made by adding a small amount of alloy elements such as Ni, Cr, and Mo to the steel, supplemented by approp...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18C22C38/14C21D8/02
Inventor 朱莹光侯家平张宏亮
Owner ANGANG STEEL CO LTD
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