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A kind of Zr-containing wire steel hot-rolled wire rod and its production process

A hot-rolled wire rod and welding wire steel technology, applied in metal rolling and other directions, can solve the problems of continuous casting billet pouring process control, etc., to reduce the generation of high melting point inclusions, improve the removal effect, and alleviate molten steel nodules Effect

Active Publication Date: 2021-12-24
SUZHOU QIJI WELDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of Zr alloying and continuous casting billet pouring process control in the production process of welding wire steel

Method used

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  • A kind of Zr-containing wire steel hot-rolled wire rod and its production process
  • A kind of Zr-containing wire steel hot-rolled wire rod and its production process
  • A kind of Zr-containing wire steel hot-rolled wire rod and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A Zr-containing welding wire steel hot-rolled wire rod, the chemical composition of the Zr-containing welding wire steel hot-rolled wire rod is calculated by weight percentage: C0.06%, Si0.52%, Mn0.99%, P0.010%, S 0.001%, Cr 0.03%, Ni 0.010%, Cu0.013, Mo 0.004, V 0.004, Ti 0.10, Al0.07%, Zr0.06%, the balance is Fe and unavoidable impurities.

[0032]A production process of Zr-containing welding wire steel hot-rolled wire rod, comprising the following steps:

[0033] Step S1, converter smelting deoxidation alloying:

[0034] Tapping composition control requirements: C: 0.023%, P: 0.007%, tapping temperature: 1620°C; deoxidation alloying is carried out when tapping, and the order and weight of alloy addition are: 3.4kg / t after tapping 1 / 3 The aluminum ingot is pre-deoxidized and alloyed by adding 13kg / t of high silicon manganese and 1.0kg / t of ferrosilicon; 6.0kg / t of lime and 3.5kg / t of aluminum are added at one time after tapping 2 / 3 Calcium acid slag-making material ...

Embodiment 2

[0046] A Zr-containing welding wire steel hot-rolled wire rod, the chemical composition of the Zr-containing welding wire steel hot-rolled wire rod is calculated by weight percentage: C0.06%, Si 0.52%, Mn0.98%, P 0.012%, S 0.002% , Cr 0.03%, Ni 0.007%, Cu0.011, Mo 0.004, V 0.001, Ti 0.12%, Al: 0.09%, Zr: 0.03%, and the balance is Fe and unavoidable impurities.

[0047] A production process of Zr-containing welding wire steel hot-rolled wire rod, comprising the following steps:

[0048] Step S1, converter smelting deoxidation alloying:

[0049] Tapping composition control requirements: C: 0.029%, P: 0.008%, tapping temperature: 1630°C; deoxidation alloying is carried out when tapping, and the order and weight of alloy addition are: 3.2kg / t after tapping 1 / 3 The aluminum ingot is pre-deoxidized, and alloyed by adding 14kg / t of high-silicon manganese and 0.5kg / t of ferrosilicon; 6.5kg / t of lime and 3kg / t of alumina are added at one time after 2 / 3 of the steel is tapped Calcium ...

Embodiment 3

[0061] A Zr-containing welding wire steel hot-rolled wire rod, the chemical composition of the Zr-containing welding wire steel hot-rolled wire rod is calculated by weight percentage: C0.06%, Si 0.55%, Mn0.97%, P 0.014%, S 0.001% , Cr 0.04%, Ni 0.008%, Cu0.010, Mo 0.004, V 0.003, Ti 0.08%, Al: 0.09%, Zr: 0.05%, and the balance is Fe and unavoidable impurities.

[0062] A production process of Zr-containing welding wire steel hot-rolled wire rod, comprising the following steps:

[0063] Step S1, converter smelting deoxidation alloying:

[0064] Tapping composition control requirements: C: 0.033%, P: 0.009%, tapping temperature: 1646°C; deoxidation alloying is carried out when tapping, and the order and weight of alloy addition are: 4.0kg / t after tapping 1 / 3 13.6kg / t of high-silicon manganese and 0.80kg / t of ferrosilicon are added for alloying; 5.5kg / t of lime and 4kg / t of aluminum are added at one time after 2 / 3 of the steel is tapped Calcium acid slag-making material to form...

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Abstract

The invention provides a Zr-containing welding wire steel hot-rolled wire rod and its production process, the chemical composition of which is calculated according to weight percentage: C≤0.06%, Si: 0.45-0.55%, Mn: 0.95-1.05%, P≤0.020% , S: ≤0.018%, Cr: ≤0.10%, Ni: ≤0.10%, Cu: ≤0.20, Mo: ≤0.10, V: ≤0.02 ， Ti: 0.07-0.13%, Al: 0.06-0.12%, Zr: 0.03-0.09%, and the balance is Fe and unavoidable impurities. By adopting reasonable LF slagging and deoxidation process, ferro-zirconium alloy addition method and timing, etc., the Zr content in molten steel can be controlled to meet the standard requirements. By adopting reasonable continuous casting process parameters, tundish mold slag, protective casting measures and other means, nodulation of molten steel in the casting process is avoided, and the normal casting of molten steel is guaranteed. The invention solves the problems of Zr alloying and continuous casting billet pouring process control in the production process of welding wire steel.

Description

technical field [0001] The invention relates to the technical fields of welding wire and metallurgy, in particular to a Zr-containing welding wire steel hot-rolled wire rod and a production process thereof. Background technique [0002] The wire rod is used to produce Φ0.8-Φ2.0mm gas-shielded solid welding wire. It has excellent welding process performance, can be used for all-position welding, has beautiful weld shape, excellent crack resistance, and high low-temperature impact toughness. It is mainly used in pipeline and nuclear power projects, such as single or multi-pass welding of carbon steel and low alloy steel with 450 or 500 MPa strength. [0003] Al, Ti, Zr and other deoxidizing elements are added to the steel, which has a high resistance to rust or dirt on the steel surface, and can also be used for rescue welding of boilers and pipelines. However, Zr is similar to Ti and Al elements, and it is very easy to react with nitrogen and oxygen, and the corresponding in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C33/04C21C7/00B21B1/16
CPCC22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/50C22C38/06C22C33/04C21C7/0056B21B1/16
Inventor 郭峰刘一龙李超
Owner SUZHOU QIJI WELDING MATERIALS CO LTD
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