Multi-element nitralloy cored wire and application method thereof in reinforcing treatment technique of Q620D steel

A Q620D, nitrided alloy technology, applied in the field of multi-element nitrided alloy cored wire, can solve the problems that the strengthening effect cannot be fully exerted, the cost is high, and the effective utilization rate is low.

Active Publication Date: 2016-04-06
马鞍山中科冶金材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low effective utilization rate of vanadium, insufficient strengthening effect, poor stability and high cost in the existing molten steel microalloying process, the present invention provides a multi-element nitrided alloy cored wire and its strengthening in Q620D steel The application method in the treatment process, the present invention designs and screens the most suitable multi-element nitride alloy, adds beneficial elements that are beneficial to transfer N to V, B, Nb and combine with it, and at the same time have a positive correlation effect on steel performance strengthening, such as Si, Mn, Ti, Cr, etc.; the composition design of the multi-element nitrided alloy screened by the present invention matches the requirements of the Q620D steel microalloying strengthening process, which not only fully guarantees the supply of N elements but also takes into account the various alloy elements positive correlation, so that its strengthening effect can be fully exerted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Select a multi-element nitrided alloy whose composition is: N: 17.5%, V: 27%, Si: 32%, Mn: 3%, Nb: 4%, B: 0.3%, Cr: 0.1%, Ti : 5.6%, C: 1.4%, P: 0.06%, S: 0.05%, the balance is Fe and trace impurities, broken into small particles of 0.01 ~ 4.5mm.

[0037] (2) Choose a bright steel strip, its composition is: C: 0.06%, Si≤0.01%, Mn: 0.035%, P: 0.018%, S: 0.021%, Al: 0.06%, the balance is Fe, and the thickness is 0.75 mm.

[0038] (3) Cover (1) the processing material and (2) the selected steel strip with a cored wire unit to form a φ13mm cored wire.

[0039] (4) Processing (3) to form a multi-element nitrided alloy cored wire for use in the refining process of molten steel in converter steelmaking.

[0040] (5) Choose a converter with a nominal capacity of 180 tons, the smelting steel is Q620D, and its refining process is: (a) Tapping at the end of the converter (the temperature of molten steel is controlled at 1660-1680°C; the composition of molten steel is control...

Embodiment 2

[0051] (1) Select a multi-element nitrided alloy whose composition is: N: 15.5%, V: 48%, Si: 20%, Cr: 5.0%, Mn: 0.6%, Ti: 0.8%, B: 1.9%, Nb : 0.3%, C: 0.3%, P: 0.05%, S: 0.10%, the balance is Fe and trace impurities, broken into small particles of 0.01 ~ 4.5mm.

[0052] (2) Choose a bright steel strip, its composition is: C: 0.06%, Si≤0.01%, Mn: 0.032%, P: 0.02%, S: 0.019%, Al: 0.062%, the balance is Fe, and the thickness is 0.30 mm.

[0053] (3) Cover (1) the processing material and (2) the selected strip steel with a cored wire unit to form a φ9mm cored wire.

[0054] (4) Process (3) into a multi-element nitrided alloy cored wire for use in converter steelmaking and molten steel refining.

[0055](5) Select a converter with a nominal capacity of 120 tons, the smelted steel is Q620D, and its refining process is: (a) Tapping at the end of the converter (the temperature of the molten steel is controlled at 1660-1680°C; the composition of the molten steel is controlled at: C: ...

Embodiment 3

[0066] (1) Select multi-element nitrided alloy, its composition is: N: 24.9%, V: 33.2%, Si: 18%, Mn: 0.05%, Ti: 7.0%, Cr: 1.8%, B: 4.5%, Nb : 1.6%, C: 0.4%, P: 0.10%, S: 0.06%, the balance is Fe and trace impurities, broken into small particles of 0.01 ~ 4.5mm. The above scores are quality scores.

[0067] (2) Choose a bright steel strip, its composition is: C: 0.07%, Si≤0.01%, Mn: 0.03%, P: 0.02%, S: 0.023%, Al: 0.07%, the balance is Fe, and the thickness is 0.56 mm.

[0068] (3) Cover (1) the processing material and (2) the selected strip steel with a cored wire unit to form a φ26mm cored wire.

[0069] (4) Process (3) into a multi-element nitrided alloy cored wire for use in converter steelmaking and molten steel refining.

[0070] (5) Choose a converter with a nominal capacity of 220 tons, the smelted steel is Q620D, and its refining process is: (a) Tapping at the end of the converter (the temperature of the molten steel is controlled at 1660-1680°C; the composition of ...

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Abstract

The invention discloses a multi-element nitralloy cored wire and an application method thereof in a reinforcing treatment technique of Q620D steel and belongs to the technical field of alloy material application. A wire core of the multi-element nitralloy cored wire comprises 15.5-24.9% of N, 27-48% of V, 18-32% of Si, 0.3-4% of Nb, 0.05-3% of Mn, 0.3-4.5% of B, 0.8-7.0% of Ti, 0.1-5.0% of Cr, 0-1.4% of C, 0-0.10% of P, 0-0.10% of S, and the balance Fe and trace impurities. According to the multi-element nitralloy cored wire and the application method thereof in the reinforcing treatment technique of the Q620D steel, multi-element nitralloy with the most proper components is designed and selected; beneficial elements are added, so that N is transferred to V, B and Nb easily, the V, B and Nb and N are combined easily, and positive correlation functions are achieved for steel performance reinforcement; the requirements of a microalloying reinforcing technique of the Q620D steel are completely meet, and the reinforcing effect of the multi-element nitralloy cored wire is brought into full play.

Description

technical field [0001] The invention belongs to the technical field of alloy material application, and more specifically relates to a multi-element nitrided alloy cored wire and its application method in Q620D steel strengthening treatment process. Background technique [0002] At present, in the production of Q620D steel, in order to improve its strength and other performance indicators, vanadium nitride (V: 75-78%, N: 12-16%) or ferrovanadium nitride (V: 42-57%, N: 9%) is usually used. ~ 14%) the microalloying process of molten steel is expected to achieve its strengthening purpose. For example, the Chinese patent application number is 201310262303.6, and the patent application document published on September 25, 2013 discloses a new process for producing low-alloy structural steel by adding ferrovanadium nitride. The steps are as follows: (1) Converter smelting; (2) LF refining; (3) continuous casting; (4) hot rolling. Compared with the existing technology, this inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C22C30/00C22C33/04C22C38/02C22C38/04C22C38/12C22C38/14
CPCC21C7/0056C22C30/00C22C33/04C22C38/001C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 陈来祥
Owner 马鞍山中科冶金材料科技有限公司
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