Smelting method of chromium steel

A smelting method and technology for chromium steel, applied in the field of smelting, can solve the problems of poor welding performance and cold bending performance, low plasticity and impact toughness of chromium steel, low oxidation resistance and corrosion resistance, etc., so as to improve plasticity and impact Toughness, high oxidation and corrosion resistance, porosity reduction and porosity reduction

Inactive Publication Date: 2019-05-21
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a chromium steel smelting method to solve the problem of low plasticity and impact toughness, poor welding performance

Method used

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  • Smelting method of chromium steel
  • Smelting method of chromium steel

Examples

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Example Embodiment

[0022] Example 1

[0023] A smelting method of chromium steel includes the following steps:

[0024] Step 1. Dephosphorization, adding decarburization furnace slag to molten steel and stirring, then adding 5-10 parts by weight of active agent and stirring, and blowing molten steel obtained after stirring for 3-4 minutes, the composition of decarburization furnace slag is 35-45 parts by weight of strong basic calcium oxide, 7-14 parts by weight of silica, 8-16 parts by weight of magnesium oxide, 1-3 parts by weight of phosphorus pentoxide, 1-3 parts by weight of manganese oxide , 18-30 parts by weight of iron oxide, 2-5 parts by weight of aluminum oxide;

[0025] Step two, desulfurization, add a desulfurizer to the molten steel after blowing, the desulfurizer component is strong alkaline calcium oxide, raise the temperature of the molten steel to 1500°C and stir for 40-60 minutes, and remove the slag after desulfurization;

[0026] Step three: converter boiling tapping, control the en...

Example Embodiment

[0031] Example 2

[0032] A smelting method of chromium steel includes the following steps:

[0033] Step 1. Dephosphorization, adding decarburization furnace slag to molten steel and stirring, then adding 5-10 parts by weight of active agent and stirring, and blowing molten steel obtained after stirring for 3-4 minutes, the composition of decarburization furnace slag is 35-45 parts by weight of strong basic calcium oxide, 7-14 parts by weight of silica, 8-16 parts by weight of magnesium oxide, 1-3 parts by weight of phosphorus pentoxide, 1-3 parts by weight of manganese oxide , 18-30 parts by weight of iron oxide, 2-5 parts by weight of aluminum oxide;

[0034] Step two, desulfurization, add a desulfurizer to the molten steel after blowing, the desulfurizer component is strong alkaline calcium oxide, raise the temperature of the molten steel to 1500°C and stir for 40-60 minutes, and remove the slag after desulfurization;

[0035] Step three: converter boiling tapping, control the en...

Example Embodiment

[0040] Example 3

[0041] A smelting method of chromium steel includes the following steps:

[0042] Step 1. Dephosphorization, adding decarburization furnace slag to molten steel and stirring, then adding 5-10 parts by weight of active agent and stirring, and blowing molten steel obtained after stirring for 3-4 minutes, the composition of decarburization furnace slag is 35-45 parts by weight of strong basic calcium oxide, 7-14 parts by weight of silica, 8-16 parts by weight of magnesium oxide, 1-3 parts by weight of phosphorus pentoxide, 1-3 parts by weight of manganese oxide , 18-30 parts by weight of iron oxide, 2-5 parts by weight of aluminum oxide;

[0043] Step two, desulfurization, add a desulfurizer to the molten steel after blowing, the desulfurizer component is strong alkaline calcium oxide, raise the temperature of the molten steel to 1500°C and stir for 40-60 minutes, and remove the slag after desulfurization;

[0044] Step three: converter boiling tapping, control the en...

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Abstract

The invention discloses a smelting method of chromium steel, and relates to the technical field of smelting. The smelting method includes the steps of de-phosphorization, desulfurization, rotating boiler boiling steel tapping, steel ladle transporting to the RH furnace station after the steel tapping, steel ladle transporting back to an LF furnace after transported out of a RH furnace, and chromium ferroalloy adding. By means of the smelting method, the phosphorus, sulfur and carbon containing content of the chromium steel is lower, the chromium containing content is improved, the hardness isimproved, the tensile strength, the elongation rate after breaking and the value of impact absorption power are greater than 40 chromium steel, wherein, the embodiment of the example 1 is the best, the thermal brittle phenomenon of the chromium steel is reduced, the pore and looseness of the gas due to SO2 in the welding metal during welding are reduced, the plasticity and impact toughness of chromium steel from the high temperature to below 0 DEG C are improved, and the welding performance and cold bending performance of the chromium steel are optimized.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for smelting chromium steel. Background technique [0002] Chromium steel refers to alloy steel containing chromium, which is hard, wear-resistant, corrosion-resistant, and does not rust. It can be used to manufacture machines and tools, and has high oxidation resistance and corrosion resistance. , there will be harmful elements such as sulfur and phosphorus. Sulfur exists in the form of FeS with a lower melting point. It forms a eutectic with iron in steel at a lower eutectic temperature, only 988 ° C. When the steel solidifies, iron sulfide When the steel is rolled at 1100-1200 ° C, the FeS on the grain boundary will melt, which greatly weakens the bonding force between the grains, resulting in hot embrittlement of the steel. The sulfur content is high, and due to the generation of SO2 during welding, pores and porosity will be formed in the weld metal. In order to p...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/02C22C38/18C21C7/064C21C7/10C21C7/00
Inventor 郑军高欣王军
Owner 马鞍山市鑫龙特钢有限公司
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