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Smelting process of nitrogenous high alloy heat-resistant steel ZG3Cr24Ni7N

A heat-resistant steel and alloy technology, applied in the field of smelting, can solve problems such as difficult control of chemical composition, and achieve the effects of easy control of chemical composition, reduction of dosage, and stable alloy recovery.

Inactive Publication Date: 2012-08-01
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improve the alloy recovery rate through a reasonable process, solve the problem that the chemical composition is not easy to control, and improve the metallurgical quality of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] The invention is mainly used for smelting and pouring of nitrogen-containing high-alloy heat-resistant steel ZG3Cr24Ni7N, for example: smelting and pouring of the upper and lower car bodies on the ￠4.0×11.7m converter, the process weight is 31.8t, the planned molten steel volume is 36t, and the electric furnace produces 20t molten steel. The amount of alloy is 18t. Citing the standard JB / T6403-92, the chemical composition is as follows: C:0.27-0.37%, Si:1.30-2.00%, Mn:0.30-0.80%, S≤0.030%, P≤0.035%, Cr:23.00-26.00%, Ni: 7.00-8.70%, N: 0.20-0.30%. The specific process is implemented as follows:

[0053] (1), ladle preparation

[0054] Use a 40t steel ladle, check all parts of the ladle to be normal, bake for 6 hours, and the temperature reaches 800

[0055] ℃ or more. Check the ventilation bricks before receiving the molten steel for good ventilation.

[0056] (2), using 30t electric arc furnace for primary refining

[0057] a), ingredients

[0058] Add 11t of ste...

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Abstract

The invention discloses a smelting process of nitrogenous high alloy heat-resistant steel ZG3Cr24Ni7N, which includes preparing a steel ladle, primary smelting in an electric arc furnace, refining the steel ladle and blowing nitrogen from the bottom of the ladle. The nitrogen which is rich in sources and low-price is used as material, the nitrogen is blown to molten steel for nitrogen alloying, and accordingly production cost of nitrogenous steel is lowered greatly. Alloy recovery efficiency is improved by reasonable processes, so that the problem that chemical components are difficult to control is solved, and the metallurgical quality of molten steel is improved.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a smelting process of nitrogen-containing high-alloy heat-resistant steel ZG3Cr24Ni7N. Background technique [0002] With the development of the national economy, nitrogen-containing heat-resistant steel has a wide range of uses due to its high-temperature oxidation resistance, high-temperature durable strength, and good thermal fatigue performance. For example, the demand for heat-resistant steel in building materials, metallurgy, chemical and electric power industries continues. Increase, ZG3Cr24Ni7N is a nitrogen-containing high-alloy heat-resistant steel with good oxidation resistance and high-temperature strength, and the service temperature can reach 1050 ° C. It is often used as the inner cover of the silicon steel sheet annealing furnace, carburizing furnace tank, annealing furnace bottom plate, heating furnace bottom Rollers, furnace claws, support plates a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C21C5/52C21C7/072C21C7/00C21C7/06
CPCY02P10/20
Inventor 赵琦崔正阳
Owner CITIC HEAVY INDUSTRIES CO LTD
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