Blank and manufacturing method and steel and manufacturing method

A production method and billet technology, applied in the direction of improving process efficiency, etc., can solve the problems of difficult steel and the use of high-pressure boiler tubes, and achieve the effects of avoiding component segregation, improving quality, and eliminating internal stress

Inactive Publication Date: 2017-11-10
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the high-pressure boiler tubes are in a state of high temperature and high press

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A blank, which has the following chemical composition in terms of mass percentage: 0.12%C, 0.51%Mn, 0.24Si, P0.003%, 0.001%S, 0.94%Cr, 0.47%Mo, 0.07%Ni, 0.008% Al, 0.05% Cu, and the balance is iron.

[0045] The method of making the blank is as follows:

[0046] In this example, the existing electric furnace smelting, LF out-of-furnace refining and VD vacuum degassing combined smelting methods are adopted, and CaO-CaF 2 The slag is deoxidized and removed to prepare molten steel. When the degree of superheat of the molten steel reaches 30°C, pour the molten steel at a rate of 1 ton / min and wait for it to cool to form a billet. In this embodiment, the blank is a cylindrical structure.

[0047] Among them, electric furnace smelting is: 600kg of lime is placed on the bottom of the furnace and raw materials are added. After heating to form a molten pool, oxygen is blown to boost melting. De-P is carried out in the later stage of melting and the early stage of oxidation. T...

Embodiment 2

[0049] A blank, which has the following chemical composition in terms of mass percentage: 0.13%C, 0.51%Mn, 0.26Si, P0.005%, 0.002%S, 1.0%Cr, 0.47%Mo, 0.07%Ni, 0.001% Al, 0.06% Cu, the balance being iron.

[0050] The method of making the blank is as follows:

[0051] In this example, the existing electric furnace, LF furnace refining and VD vacuum degassing combined smelting methods are adopted, and CaO-A 12 o 3 -CaF 2 The slag is deoxidized and removed to prepare molten steel. When the degree of superheat of the molten steel reaches 30°C, pour the molten steel at a rate of 0.94 t / min and wait for it to cool to form a billet. In this embodiment, the blank is a cylindrical structure.

[0052] Among them, electric furnace smelting is: 620kg of lime is placed on the bottom of the furnace and raw materials are added. After heating to form a molten pool, oxygen is blown to boost melting. De-P is carried out in the later stage of melting and the early stage of oxidation. The st...

Embodiment 3

[0054] A billet having the following chemical composition in terms of mass percentage: 0.14%C, 0.53%Mn, 0.30Si, P0.008%, 0.005%S, 1.04%Cr, 0.48%Mo, 0.08%Ni, 0.012% Al, 0.09% Cu, the balance being iron.

[0055] The method of making the blank is as follows:

[0056] In this example, the existing electric furnace, LF furnace refining and VD vacuum degassing combined smelting methods are adopted, and CaO-A 12 o 3 -MgO-SiO 2 The slag is deoxidized and removed to prepare molten steel. When the degree of superheat of the molten steel reaches 35° C., pour the molten steel at a rate of 1.46 t / min and wait for it to cool to form a billet. In this embodiment, the blank is a cylindrical structure.

[0057] Among them, electric furnace smelting is: 663kg of lime is placed on the bottom of the furnace and raw materials are added. After heating to form a molten pool, oxygen is blown to boost melting. De-P is carried out in the later stage of melting and the early stage of oxidation. Th...

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PUM

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Abstract

The invention discloses a blank and a manufacturing method and steel and a manufacturing method, and belongs to the field of steel. The blank comprises the following chemical components in percentage by mass: 0.12-0.14% of C, 0.51-0.53% of Mn, 0.24-0.30% of Si, 0.003-0.008% of P, 0.001-0.005% of S, 0.94-1.04% of Cr, 0.47-0.48% of Mo, 0.07-0.08% of Ni, 0.008-0.012% of Al, 0.05-0.09% of Cu, and the balance of iron. The blank is higher in cleanness and excellent in mechanical performance, and is suitable for high-temperature and high-pressure environments.

Description

technical field [0001] The invention relates to the field of steel products, in particular to a blank and a manufacturing method, steel and a manufacturing method thereof. Background technique [0002] Since the reform and opening up, my country's power industry has developed rapidly, and the capacity and annual power generation of generator sets have increased year by year. The annual growth ratio of generating unit capacity is at a high level of rapid development after going through three changes in a period of 10 years. At present, thermal power generation still occupies a relatively large proportion in my electric power industry, which requires various high-voltage equipment, such as high-pressure boilers. In the process of thermal power generation, it is necessary to use high-quality pipes such as high-pressure boiler tubes, and the main consumers of high-pressure boiler tubes are still thermal power boiler manufacturers. The use of high-pressure boiler tubes in therm...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21C7/06C21C7/076C21D8/00
CPCC21C7/06C21C7/076C21D8/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44Y02P10/20
Inventor 易文代永斌
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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