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Method of smelting high-strength welding wire steel ER80-G from vanadium-containing molten iron

A technology of ER80-G, welding wire steel, applied in the field of metallurgy, can solve the problems of poor economic benefits and low profits

Active Publication Date: 2018-09-28
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The No. 2 high-end production line of HBIS Chenggang has good rolling mill equipment conditions. At present, H08A, ER70S-6, H08MnA, H10Mn2 and other medium and low-end high-quality welding consumable products are mainly used, with low profits and poor economic benefits.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the method for smelting high-strength welding wire steel ER80-G by vanadium-containing molten iron, the specific process steps are as follows:

[0035] (1) The chemical composition and mass percentage of vanadium-containing molten iron are: C: 4.32%, Si: 0.16%, Ti: 0.14%, Mn: 0.32%, P: 0.172%, S: 0.031%, V: 0.186 %, the rest is iron and unavoidable impurities; molten iron temperature: 1312°C;

[0036] Vanadium-extracting converter is charged with 126t of vanadium-containing molten iron (converter volume 120t), lime 30kg / t steel, light-burned dolomite 15kg / t steel, after dephosphorization by vanadium-extracting converter, semi-steel temperature is 1365℃, P: 0.040%;

[0037] (2) After the steel tapping is completed, pour 15kg / t steel hot state ladle pouring slag into the half ladle, the main chemical composition and mass percentage are: CaO: 48.0%, SiO 2 +Al 2 o 3 : 24%, MgO: 8%, MnO+FeO: 1.8%;

[0038] (3) Put the dephosphorized semi-steel into the...

Embodiment 2

[0044] In this embodiment, the method for smelting high-strength welding wire steel ER80-G by vanadium-containing molten iron, the specific process steps are as follows:

[0045] (1) The chemical composition and mass percentage of vanadium-containing molten iron are: C: 4.28%, Si: 0.17%, Ti: 0.13%, Mn: 0.33%, P: 0.168%, S: 0.027%, V: 0.188 %, the rest is iron and unavoidable impurities; molten iron temperature: 1326°C;

[0046] Vanadium-extracting converter is charged with 125t of vanadium-containing molten iron (converter volume 120t), adding lime 40kg / t steel, light-burned dolomite 8kg / t steel, after dephosphorization by vanadium-extracting converter, semi-steel temperature is 1372℃, P: 0.052%;

[0047] (2) After the steel tapping is completed, pour 10kg / t steel hot state ladle pouring residue into the half ladle. The main chemical composition and mass percentage are: CaO: 46.0%, SiO 2 +Al 2 o 3 : 22%, MgO: 7%, MnO+FeO: 1.6%;

[0048] (3) Put the dephosphorized semi-ste...

Embodiment 3

[0054] In this embodiment, the method for smelting high-strength welding wire steel ER80-G by vanadium-containing molten iron, the specific process steps are as follows:

[0055] (1) The chemical composition and mass percentage of vanadium-containing molten iron are: C: 4.18%, Si: 0.15%, Ti: 0.12%, Mn: 0.35%, P: 0.159%, S: 0.029%, V: 0.178 %, the rest is iron and unavoidable impurities; molten iron temperature: 1318°C;

[0056] Vanadium-extracting converter is charged with 130t of vanadium-containing molten iron (converter volume 120t), lime 35kg / t steel, light-burned dolomite 12kg / t steel, after dephosphorization by vanadium-extracting converter, semi-steel temperature is 1369℃, P: 0.048%;

[0057] (2) After the steel tapping is completed, pour 20kg / t steel hot ladle slag into the half ladle. The main chemical composition and mass percentage are: CaO: 45.0%, SiO 2 +Al 2 o 3 : 25%, MgO: 9%, MnO+FeO: 2.0%;

[0058] (3) Put the dephosphorized semi-steel into the steelmaking...

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Abstract

The invention discloses a method of smelting high-strength welding wire steel ER80-G from vanadium-containing molten iron, which includes the steps of: loading the vanadium-containing molten iron in avanadium extract converter for dephosphorization; after tapping is finished, adding hot-state steel ladle casting residue to a semi-steel ladle by 10-20 kg per ton of steel; loading dephosphorized semi-steel into a smelting converter, adding thread cut head or casting blank cut head waste steel, performing dual-slag operation in the converter to perform smelting, and performing refining in an LFrefining furnace; after the treatment, hoisting the steel to a continuous casting step, wherein the casting operation is protected during the whole course of the continuous casting. In the invention,the vanadium-containing molten iron is subjected to the double-dephosphorization, wherein the content of phosphorus in steel is effectively reduced by means of the dual-slag method; by using a non-aluminum-based deoxidant, generation of Al2O3 impurity in the steel is reduced. A mixture of aluminum powder and ferrosilicon powder is added during the refining heating process in several batches at small batch size, so that sulfur content of the steel is effectively reduced and impurities are removed. The method supplies a strong guarantee to cleanness of molten steel and castability of the continuous casting, and finally achieves the object of smelting the high-strength welding wire steel ER80-G from vanadium-containing molten iron.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting high-strength welding wire steel ER80-G by molten iron containing vanadium. Background technique [0002] With the improvement of strength requirements for welded structures, high-strength welding wire steel has been more and more widely used in welded structures. HBIS Chenggang No. 2 High Line has good rolling mill equipment conditions. At present, it mainly uses low-end high-quality welding consumables such as H08A, ER70S-6, H08MnA, and H10Mn2, with low profits and poor economic benefits. In order to improve the competitiveness of enterprise products, it is urgent to develop high-end products with higher performance to improve economic benefits. With the rapid development of low-alloy high-strength steel in my country, especially the improvement of welding requirements for large-scale structural steel such as pipeline steel, pressure vessel...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C7/06C21C7/064C21C7/00C22C38/02C22C38/44C22C38/50C22C38/58
CPCC21C5/36C21C7/0037C21C7/06C21C7/064C22C38/001C22C38/02C22C38/44C22C38/50C22C38/58Y02P10/20
Inventor 孙福振段希海梁新维杨坤康爱元雷爱敏
Owner HEBEI IRON AND STEEL
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