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Smelting method of chromium-molybdenum steel

A smelting method, the technology of chrome-molybdenum steel, applied in the field of smelting, can solve the problems of poor welding performance and cold bending performance, low plasticity and impact toughness, low oxidation resistance and corrosion resistance of chrome-molybdenum steel, so as to improve plasticity and impact toughness, improve surface quality, reduce porosity and porosity

Inactive Publication Date: 2019-06-18
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a smelting method of chromium-molybdenum steel to solve the problem of low plasticity and impact toughness of chromium-molybdenum steel in the prior art, poor welding performance and cold bending performance, thermal embrittlement of chromium-molybdenum steel, and low oxidation resistance. and low corrosion resistance, many defects such as surface white spots and hairlines

Method used

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  • Smelting method of chromium-molybdenum steel

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Effect test

Embodiment 1

[0029] A method for smelting chromium-molybdenum steel, characterized in that it comprises the following steps:

[0030] Step 1, dephosphorization, adding decarburization furnace slag into the molten steel and stirring, then adding an active agent and stirring, blowing the molten steel obtained after stirring for 3-4 minutes;

[0031] Step 2, desulfurization, adding a desulfurizing agent to the molten steel after blowing, the desulfurizing agent component is a strong basic calcium oxide, raising the temperature of the molten steel to 1500 ° C and stirring for 40 minutes;

[0032] Step 3, dehydrogenation, blowing argon in molten steel for 10 minutes after desulfurization, the amount of argon blowing is controlled at 0.5-0.6m 3 / min and stir for 15min, then remove the slag;

[0033] Step 4: Converter boiling tapping, heating up, controlling the final tapping temperature to be 1680±5°C, adjusting the carbon content during tapping to 0.05 parts by weight and the oxygen activity t...

Embodiment 2

[0040] A method for smelting chromium-molybdenum steel, characterized in that it comprises the following steps:

[0041] Step 1, dephosphorization, adding decarburization furnace slag into the molten steel and stirring, then adding an active agent and stirring, blowing the molten steel obtained after stirring for 3-4 minutes;

[0042] Step 2, desulfurization, adding a desulfurizing agent to the molten steel after blowing, the desulfurizing agent component is a strong basic calcium oxide, raising the temperature of the molten steel to 1500 ° C and stirring for 40 minutes;

[0043] Step 3, dehydrogenation, blowing argon in molten steel for 10 minutes after desulfurization, the amount of argon blowing is controlled at 0.5-0.6m 3 / min and stir for 15min, then remove the slag;

[0044] Step 4: Converter boiling tapping, heating up, controlling the final tapping temperature to be 1680±5°C, adjusting the carbon content during tapping to 0.05 parts by weight and the oxygen activity t...

Embodiment 3

[0050] A method for smelting chromium-molybdenum steel, characterized in that it comprises the following steps:

[0051] Step 1, dephosphorization, adding decarburization furnace slag into the molten steel and stirring, then adding an active agent and stirring, blowing the molten steel obtained after stirring for 3-4 minutes;

[0052] Step 2, desulfurization, adding a desulfurizing agent to the molten steel after blowing, the desulfurizing agent component is a strong basic calcium oxide, raising the temperature of the molten steel to 1500 ° C and stirring for 40 minutes;

[0053] Step 3, dehydrogenation, blowing argon in molten steel for 10 minutes after desulfurization, the amount of argon blowing is controlled at 0.5-0.6m 3 / min and stir for 15min, then remove the slag;

[0054] Step 4: Converter boiling tapping, heating up, controlling the final tapping temperature to be 1680±5°C, adjusting the carbon content during tapping to 0.05 parts by weight and the oxygen activity t...

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Abstract

The invention discloses a smelting method of chromium-molybdenum steel, and relates to the technical field of smelting. The smelting method of the chromium-molybdenum steel comprises the steps of dephosphorization, desulfurization, dehydrogenization, converter boiled tapping, conveying of steel ladles to a RH furnace station after tapping, conveying back to a LF furnace after carrying out from a RH furnace, and feeding of ferromolybdenum and ferrochromium alloys and metal manganese. The smelted chromium-molybdenum steel is lower in content of phosphorus, sulfur, hydrogen and carbon and higherin content of chromium, manganese and molybdenum; the embodiment 1 is the optimal; and through adding of manganese, the strength and the plasticity are improved, the hardening capacity and the wear resistance are improved, the hardenability of the chromium-molybdenum steel is effectively improved, the high-temperature instant strength and the durability of the steel are improved, the hot brittleness phenomenon of the chromium-molybdenum steel is reduced, the formation of air holes and looseness during welding is reduced, the plasticity and the impact toughness of the chromium-molybdenum steelcooled from high temperature to below 0 DEG C are improved, the welding performances and the cold bending performances of the chromium-molybdenum steel are optimized, and the surface quality is improved.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a smelting method of chromium-molybdenum steel. Background technique [0002] Chromium-molybdenum steel, also known as medium-temperature hydrogen-resistant steel, has good hydrogen corrosion resistance and high temperature resistance, so it is widely used in hydrogen-containing devices and high-temperature equipment such as oil refining and chemical industry, and is one of the commonly used steel types for pressure vessels. , but due to the production of elements such as sulfur, phosphorus and hydrogen during the smelting process of chrome-molybdenum steel, sulfur exists in the form of FeS with a lower melting point, and the eutectic temperature at which it forms a eutectic with iron in steel is lower, only 988°C, when the steel is solidified, iron sulfide precipitates at the primary grain boundary, and when the steel is rolled at 1100-1200°C, the FeS on the grain boundary will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C7/064C21C7/072C21C7/10C22C38/02C22C38/04C22C38/22
Inventor 郑军高欣王军
Owner 马鞍山市鑫龙特钢有限公司
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