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Smelting method of low carbon steel for mechanical structural pipe

A technology of mechanical structure and smelting method, applied in the direction of improving process efficiency, etc., can solve the problems of small output, high application professionalism, and limited amount of low-carbon steel used in mechanical structure pipes, etc., to achieve increased strength, high product strength, The effect of continuous casting process stabilization

Active Publication Date: 2021-11-23
石钢京诚装备技术有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, only individual iron and steel enterprises in China can produce low-carbon steel grades for mechanical structural pipes. Affected by factors such as small output and high degree of application expertise, domestic consumption of low-carbon steel grades for mechanical structural pipes is limited

Method used

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  • Smelting method of low carbon steel for mechanical structural pipe
  • Smelting method of low carbon steel for mechanical structural pipe
  • Smelting method of low carbon steel for mechanical structural pipe

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Embodiment Construction

[0018] The present invention will be described in further detail below in combination with specific embodiments.

[0019] Examples 1-12: The smelting process of low-carbon steel for mechanical structural pipes adopts the "BOF(100t)-LF(120t)-VD(120t)-CC (arc radius R14m)" process flow, and the process parameters of each process are as follows mentioned.

[0020] (1) BOF converter smelting process: molten iron requires P≤0.110wt%, S≤0.020wt%, Si 0.20-0.60wt%, temperature 1300-1450°C. After the smelting of the previous furnace is completed, 2-5 tons of steel slag is left in the converter furnace, and nitrogen is blown from the bottom to splash slag to protect the furnace. 3 / h. The ratio of molten iron scrap in converter is: 80-85% of molten iron and 15-20% of scrap. Before smelting, the converter slag near the converter cap must be cleaned. If splashing occurs during the blowing process, the remaining converter slag in the furnace cap must be cleaned a second time to ensure t...

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Abstract

A low-carbon steel for mechanical structural pipes and its smelting method, the mass percentage of its components is: C 0.14%-0.17%, Si 0.28%-0.33%, Mn 1.35%-1.45%, P≤0.012%, S≤ 0.003%, Al 0.020%~0.040%, Cr 0.70%~0.80%, W 0.40%~0.60%, Ni 0.10%~0.20%, Cu 0.10%~0.15%, Mo 0.35%~0.50%, Nb 0.03%~0.06 %, V 0.03%~0.07%, Ca 0.0015%~0.0030%, the balance is Fe and unavoidable impurities; the method steps are: (1) BOF converter smelting process, (2) LF refining process, (3) VD vacuum Treatment process, (4) continuous casting process. The low-carbon steel of the present invention strictly controls the content of harmful residual elements such as P and S and gas components such as O, N, and H to improve the strength, hardness, and wear resistance of the steel, as well as resist atmospheric corrosion and resist hydrogen, nitrogen, and ammonia at high temperatures. Corrosion ability; the steel products produced meet the needs of high-quality high-strength mechanical structural pipes. It has the characteristics of high strength, high hardness, good wear resistance and good corrosion resistance.

Description

technical field [0001] The invention relates to a low-carbon structural steel and a smelting method thereof, in particular to a smelting method of low-carbon steel for mechanical structural pipes. Background technique [0002] Low-carbon steel for mechanical structural pipes is a low-carbon structural steel that meets the Swedish SS steel material standard. The low-carbon steel grades for mechanical structural pipes are widely used in foreign countries, and can be used for processing mechanical structural pipes or steel structural parts such as welding, riveting, and bolting. The composition can be adjusted according to different uses, and the low-carbon steel for mechanical structural pipes can be processed into professional steel such as rivet steel, bridge steel, pressure vessel steel, hull steel, and boiler steel. The low-carbon steel for mechanical structural pipes is usually smelted by converters, electric furnaces or open hearth furnaces as primary furnaces, and hot-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C33/06C21C7/10
CPCC21C7/10C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48Y02P10/20
Inventor 魏巍李虹刘宪民宋平刘奇
Owner 石钢京诚装备技术有限公司
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