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Technology for smelting ER70S-6 welding wire steel through utilizing vanadium-containing molten iron

A technology of ER70S-6 and welding wire steel, which is applied in the field of metallurgy, can solve the problems of low strength of welding wire steel, poor spinning effect, and low weld strength, and achieve the effects of increasing strength, improving toughness and reducing sparks

Inactive Publication Date: 2013-03-27
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, vanadium, as a strong carbide forming element and precipitation hardening agent, has strong strength, impact resistance, corrosion resistance and weldability at high temperatures; the smelting method of ER70S-6 steel in the background technology is smelting with ordinary molten iron, the chemical composition The content is: C: 0.06%-0.15%, Mn: 1.40%-1.85%, Si: 0.80%-1.15%, P: ≤0.025%, S≤0.035%. When it is in the middle and lower limits, the strength of the welding wire steel is low, the spinning effect is not good, and the weld strength is also low

Method used

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  • Technology for smelting ER70S-6 welding wire steel through utilizing vanadium-containing molten iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The molten iron after vanadium extraction, C: 3.78, V: 0.031%, S: 0.038%, Cr+Ni+Cu: 0.042%, is blended into the steelmaking converter, and the end point of blowing is C: 0.05%, P: 0.012%, S : 0.028%, which meets the requirements of tapping. During the tapping process, 0.3kg / ton of silicon-aluminum-barium deoxidizer, 358kg of lime, 142kg of refining slag, 0.5kg / ton of ferrosilicon powder, and 0.008% of remaining vanadium, Cr +Ni+Cu: 0.017%; 0.9kg / ton of ferrosilicon powder is added to LF furnace refining, 0.9kg / t of ferrosilicon powder is added to LF furnace refining to reduce vanadium in slag, and the vanadium content in steel is increased by 0.003%, and carbon powder and ferrosilicon are used and low-carbon ferromanganese to fine-tune other components. After meeting the requirements of the finished product, soft blow for 12 minutes, hang and cast to protect the casting, and the properties of the billet after rolling meet the requirements of the national standard. The c...

Embodiment 2

[0018] The molten iron after vanadium extraction, C: 3.67, V: 0.042%, S: 0.035%, Cr+Ni+Cu: 0.046%, is blended into the steelmaking converter, and the end point of blowing is C: 0.04%, P: 0.010%, S : 0.021%, which meets the requirements of tapping. During the tapping process, 0.4kg / ton of silicon aluminum barium deoxidizer is added, 398kg of lime, 145kg of refining slag, 0.5kg / ton of ferrosilicon powder, 0.005% of remaining vanadium, Cr +Ni+Cu: 0.014%; 0.7kg / ton of ferrosilicon powder is added to LF furnace refining, 0.9kg / t of ferrosilicon powder is added to LF furnace refining to reduce vanadium in slag, and the vanadium content in steel increases by 0.004%, using carbon powder and ferrosilicon and low-carbon ferromanganese to fine-tune other components. After meeting the requirements of the finished product, soft blow for 12 minutes, hang and cast to protect the casting, and the properties of the billet after rolling meet the requirements of the national standard. The compos...

Embodiment 3

[0020] The molten iron after vanadium extraction, C: 3.74, V: 0.040%, S: 0.033%, Cr+Ni+Cu: 0.041%, is blended into the steelmaking converter, and the end point of blowing is C: 0.06%, P: 0.011%, S : 0.025%, which meets the requirements of tapping. During the tapping process, 0.2kg / ton of silicon-aluminum-barium deoxidizer, 378kg of lime, 167kg of refining slag, 0.3kg / ton of ferrosilicon powder, and 0.008% of vanadium content, Cr +Ni+Cu: 0.019%; adding ferrosilicon powder 0.9kg / t vanadium in reduced slag for refining in LF furnace, the vanadium content in steel is increased by 0.006%, using carbon powder, ferrosilicon and low-carbon ferromanganese to fine-tune other components to meet the requirements of finished products After soft blowing for 12 minutes, then hanging and continuous casting for protection casting, the properties of the slab after rolling meet the requirements of the national standard. The composition of the finished product is: C: 0.08%, Si: 0.88%, Mn: 1.46, P...

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Abstract

The invention relates to a technology for smelting an ER70S-6 welding wire steel through utilizing vanadium-containing molten iron, which belongs to the technical field of metallurgy. The technical scheme is as follows: the vanadium-containing molten iron is taken as a raw material for converter vanadium extracting, semisteel refining, ladle furnace (LF) refining, continuous casting and steel rolling. The technology has the beneficial effects that the vanadium in the vanadium-containing molten iron is fully used, the chemical ingredients of the ER70S-6 welding wire steel are redesigned, a deoxidation technology is optimized, is a refining process mixed with less Al2O3 and only uses ferrosilicon powder for diffusible desoxydation, any material which contains Ca is not added during the whole smelting process, so that sparks are reduced during a welding process; and a certain amount of residual vanadium is controlled to exist in the welding wire steel, double functions of grain refining and precipitation strengthening of the vanadium in the steel are played, and the steel strength and the steel toughness are improved.

Description

technical field [0001] The invention relates to a process for smelting ER70S-6 welding wire steel by using molten iron containing vanadium, belonging to the technical field of metallurgy. Background technique [0002] At present, gas shielded welding is an arc welding that uses external gas as the arc medium and protects the arc and welding area. It has been more and more widely used in my country's heavy machinery, engineering machinery, ships, boilers, vehicles and other manufacturing industries, gradually replacing Inefficient electrode shielded welding, the welding wire material used in gas shielded welding is generally ER70S-6 wire steel. Containing a certain amount of vanadium in ER70S-6 welding wire steel can play the dual role of grain refinement and precipitation strengthening, mainly reflected in the presence of vanadium in the steel can form finer ferrite crystal-pearlite structure, thereby improving Toughness in the heat-affected zone. In addition, vanadium, as ...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 国富兴韩春良翁玉娟王金星杨坤吴雨晨
Owner HEBEI IRON AND STEEL
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