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Steel plate for normalizing type low-temperature pressure vessel at-70 DEG C

A technology for pressure vessels and steel plates, applied in the field of metallurgy, can solve problems such as increasing the difficulty of smelting, and achieve the effects of good plasticity and excellent low-temperature impact toughness

Inactive Publication Date: 2013-05-29
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it adopts ultra-low carbon design, which increases the difficulty of smelting, and does not involve low-temperature impact toughness at -70°C
The disadvantage is that it does not involve low temperature impact toughness at -70°C

Method used

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  • Steel plate for normalizing type low-temperature pressure vessel at-70 DEG C
  • Steel plate for normalizing type low-temperature pressure vessel at-70 DEG C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw molten iron undergoes deep desulfurization of molten iron, converter top and bottom blowing, ladle argon blowing, refining outside the LF furnace, RH vacuum treatment and continuous casting process to obtain a 250mm thick slab with the chemical composition weight percentage shown in Table 1. The heating temperature of the slab is 1230℃, the total time in the furnace is 322min, and the rolling temperature of the first stage is 1220℃. The relative reduction rate of single pass should be controlled at 25~40% for at least two passes. When the thickness of the rolled piece is 30mm, It is heated to 1040°C on the roller table, and then the second stage rolling is carried out. The final rolling temperature is not controlled, and the thickness of the finished steel plate is 10mm. After the rolling, the steel plate enters the hot straightening machine with air cooling, and the cooling bed cools after the hot straightening. After shot blasting, the steel plate is sent to th...

Embodiment 2

[0028] The embodiment is the same as in Example 1, where the heating temperature is 1235°C, the total furnace time is 319min, the opening temperature of the first stage rolling is 1223°C, the opening temperature of the second stage rolling is 916°C, and the intermediate billet is to be warmed. The thickness is 72mm, the final rolling temperature is 822°C, and the thickness of the finished steel plate is 24mm. After rolling, the steel plate enters the accelerated cooling (ACC) device, the final cooling temperature is 700℃, and the cooling bed is cooled after hot straightening. After shot blasting, the steel plate is sent to the normalizing furnace for treatment. The normalizing temperature is 870℃, the holding time is 10min+t×1.5min / mm, and t is the thickness of the steel plate. Finally, the steel plate can be obtained.

Embodiment 3

[0030] The implementation is the same as in Example 1, where the heating temperature is 1238°C, the total furnace time is 342min, the opening temperature of the first stage rolling is 1228°C, the opening temperature of the second stage rolling is 918°C, and the intermediate billet is to be warmed. The thickness is 73mm, the final rolling temperature is 832°C, and the thickness of the finished steel plate is 26mm. After rolling, the steel plate enters the accelerated cooling (ACC) device, the final cooling temperature is 695℃, and the cooling bed is cooled after hot straightening. After shot blasting, the steel plate is sent to the normalizing furnace for processing, the normalizing temperature is 870℃, the holding time is 10min+t×1.5min / mm, and t is the thickness of the steel plate. Finally, the steel plate can be obtained.

[0031] Table 1 Chemical composition of Examples 1 to 3 of the present invention (wt%)

[0032] Example

C

Si

Mn

P

S

Nb

Ni

Ti

Alt

1

0.10

0.29

1.48...

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Abstract

The invention relates to a steel plate for a normalizing type low-temperature pressure vessel at-70 DEG C. The steel plate comprises the chemical ingredients by weight percent: 0.09-0.12% of C, 0.15-0.50% of Si, 1.2-1.6% of Mn, 0.015% or less of P, 0.005% or less of S, 0.02-0.04% of Nb, 0.40-0.80% of Ni, 0.006-0.010% of Ti, 0.020-0.034% of Alt and the balance of Fe and inevitable impurity. The preparation method comprises the steps of: by taking iron water and waste steel after desulphurization pretreatment as materials, carrying out converter smelting, LF refining, RH vacuum treatment, continuously casting, heating, rolling, cooling, normalizing heat treatment and the like to obtain steel plate for the normalizing low-temperature pressure vessel at -70 DEG C. The steel plate has the advantages that the yield strength is greater than 380MPa; and the steel plate has good plasticity and excellent low temperature impact toughness at -70 DEG C, and can be applied to fabrication of low-temperature pressure container equipments such as a liquid chlorine storage tank, a high-pressure nitrogen storage tank, and an ammonia cooler.

Description

Technical field [0001] The invention relates to low-alloy pressure vessel steel in the field of metallurgy, in particular to a -70°C normalizing type low-temperature pressure vessel steel plate Background technique [0002] Pressure vessels are widely used in chemical, petroleum, machinery, power, metallurgy, nuclear energy, aviation, aerospace, marine and other sectors. It is an indispensable core equipment in the industrial production process and an important symbol of a country's equipment manufacturing level. Pressure vessel steel plates are a large category of special high-tech and high-value-added products among medium and heavy plates. Steel for pressure vessels used to store and transport low-temperature liquids such as liquefied petroleum gas and liquefied natural gas requires not only excellent strength and toughness and high-temperature mechanical properties, but also good low-temperature impact toughness. [0003] The current domestic steel for pressure vessels of the...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C21D1/28C21D11/00
Inventor 杨雄霍培珍董瑞峰温利军吴鹏飞李文艺张文博
Owner INNER MONGOLIA BAOTOU STEEL UNION
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