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Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof

A technology for Q370R and pressure vessels, which is applied in the field of Ni-free normalizing Q370R pressure vessel steel plates and its manufacturing, can solve the problems of increasing costs and increasing smelting costs, and achieves alloy cost reduction, good plasticity, and excellent high-temperature tensile properties Effect

Inactive Publication Date: 2012-07-25
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 the ultra-low carbon design increases the cost of smelting
The disadvantage is that Ni alloy is added, which increases the cost

Method used

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  • Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof
  • Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof
  • Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw material molten iron undergoes deep desulfurization of molten iron, top-bottom blowing of converter, argon blowing of ladle, external refining of LF furnace, RH vacuum treatment and continuous casting process to obtain 250mm thick slab with chemical composition weight percentage shown in Table 1. The slab heating temperature is 1200°C, the total time in the furnace is 260min, the rolling start temperature of the first stage is 1180°C, and the relative reduction rate of a single pass is controlled at 25-40% for at least two passes. When the thickness of the rolled piece is 100mm, Wait until the temperature reaches 920°C on the roller table, and then carry out the second-stage rolling, the final rolling temperature is 890°C, and the thickness of the finished steel plate is 50mm. After rolling, the steel plate enters the accelerated cooling (ACC) device and is cooled to 680°C at a rate of 5°C / s. After hot straightening, the cooling bed is cooled. After the steel pl...

Embodiment 2

[0029] The implementation is the same as in Example 1, wherein the heating temperature is 1220°C, the total time in the furnace is 260min, the rolling start temperature of the first stage rolling is 1180°C, the starting rolling temperature of the second stage rolling is 920°C, and the thickness of the rolled piece is 108mm, the final rolling temperature is 890°C, and the thickness of the finished steel plate is 60mm. The cooling rate of the steel plate is 5°C / s, and the final cooling temperature is 680°C. After hot straightening, the cooling bed is cooled. After the steel plate is shot blasted, it is sent to the normalizing furnace for treatment. The normalizing temperature is 880°C, and the holding time is 10min+t×1.5min / mm, where t is the thickness of the steel plate. Finally, the steel plate can be obtained.

Embodiment 3

[0031] The implementation is the same as in Example 1, wherein the heating temperature is 1220°C, the total time in the furnace is 260min, the rolling start temperature of the first stage rolling is 1200°C, the starting rolling temperature of the second stage rolling is 1040°C, and the thickness of the rolled piece is 30mm, the final rolling temperature is 830°C, and the thickness of the finished steel plate is 10mm. After hot straightening, the cooling bed is cooled. After the steel plate is shot blasted, it is sent to the normalizing furnace for treatment. The normalizing temperature is 880°C, and the holding time is 10min+t×1.5min / mm, where t is the thickness of the steel plate. Finally, the steel plate can be obtained.

[0032] The chemical composition (wt %) of the embodiment of the present invention 1-3 of table 1

[0033] Example

C

Si

mn

P

S

Nb

V

Ti

als

1

0.16

0.45

1.50

0.014

0...

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Abstract

The invention relates to a Ni-free normalized type Q370R pressure vessel steel plate and a manufacturing method of the Ni-free normalized type Q370R pressure vessel steel plate. The steel plate comprises the following chemical components in percentage by weight: 0.15-0.18% of C,0.25-0.50% of Si, 1.4-1.6% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.03% of Nb, 0.07-0.08% of V, 0.006-0.010% of Ti, 0.024-0.034% of Als, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps of: taking molten iron and waste steel subjected to desulfuration pretreatment as raw materials, and then performing the processes of smelting, continuous casting, heating, rolling and cooling, normalizing thermal treating, and the like, thereby obtaining the Ni-free normalized type Q370R pressure vessel steel plate. The Ni-free normalized type Q370R pressure vessel steel plate has the advantages of above 370MPa yield strength, excellent plasticity, low-temperature impact toughness, high-temperature tensile property, excellent Z directional tensile property, and wide application in the field of storing liquefied petroleum gas, liquefied natural gas, and the like.

Description

technical field [0001] The invention relates to a low-alloy pressure vessel steel in the field of metallurgy, in particular to a Ni-free normalizing Q370R pressure vessel steel plate and a manufacturing method thereof. Background technique [0002] Pressure vessels are widely used in chemical industry, petroleum, machinery, power, metallurgy, nuclear energy, aviation, aerospace, marine and other departments. 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 in 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, toughness and high-temperature mechanical properties, but also good low-temperature impact toughness. [0003] At present, the...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74
Inventor 霍培珍董瑞峰吴鹏飞孙丽钢杨雄李文艺温利军张军高军
Owner INNER MONGOLIA BAOTOU STEEL UNION
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