KR101869423B1 - Flux cored arc welding material for high manganese steel - Google Patents

Flux cored arc welding material for high manganese steel Download PDF

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KR101869423B1
KR101869423B1 KR1020160177631A KR20160177631A KR101869423B1 KR 101869423 B1 KR101869423 B1 KR 101869423B1 KR 1020160177631 A KR1020160177631 A KR 1020160177631A KR 20160177631 A KR20160177631 A KR 20160177631A KR 101869423 B1 KR101869423 B1 KR 101869423B1
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South Korea
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flux cored
manganese steel
arc welding
welding material
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KR1020160177631A
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Korean (ko)
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이봉근
한일욱
이상철
김극
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Abstract

Disclosed is a flux cored arc welding material for a high manganese steel. The flux cored arch welding material according to one embodiment of the present invention comprises: 0.05-0.30 wt% of C; 0.4-0.7 wt% of Si; 3.0-10.0 wt% of Mn; 0.02 wt% or less of P; 0.01 wt% or less of S; 3.0-7.0 wt% of Ni; 10.0-18.0 wt% of Cr; 3.0 wt% or less (greater than 0 wt%) of Mo; 2.0 wt% or less (greater than 0 wt%) of Cu; and the remaining including Fe and other inevitable impurities, wherein an outer cover comprises: 0.01 wt% or less of P; 0.01 wt% or less of S; 0.015-0.025 wt% of C; 0.02 wt% or less of Si; 0.2 wt% or less of Mn; and the remaining including Fe and other inevitable impurities.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a flux cored arc welding material for a high manganese steel,

The present invention relates to a flux cored arc welding material, and more particularly, to a flux cored arc welding material for non-magnetic high manganese steel.

Materials such as switchboards, transformers and the like generally require high non-magnetic properties along with high strength. In order to meet such conditions, conventionally, stainless steel having a large amount of nickel and chromium has been used. However, there is a problem in that the stainless steel has a low strength and a high price.

Ferritic or martensitic stainless steels may be used to increase strength, but ferritic or martensitic stainless steels have high magnetic properties and are very expensive.

In recent years, high manganese steels have been developed to increase the austenite stability by adding a large amount of Mn and C in the steel in order to secure price competitiveness and to have non-magnetic properties.

Therefore, high manganese steel with excellent nonmagnetic properties was developed, and it became necessary to develop customized welding materials. Basically, the content of C is controlled to a low level in case of stainless steel, but the content of C in high manganese steel is controlled to a high level. Therefore, there is a problem that cracks occur in the weld during welding due to the welding material applied to existing stainless steel.

Korean Patent Publication No. 10-2014-0188144

Embodiments of the present invention seek to provide a flux cored arc welding material for high manganese steel.

The flux cored wire for high manganese steel according to an embodiment of the present invention comprises a sheath and a flux cored wire filled with a flux in the sheath, 0.01% or less of S, 3.0 to 7.0% of Ni, 10.0 to 18.0% of Cr, 3.0% or less of Mo, 0.4 to 0.7% of Si, 3.0 to 10.0% And a Cu content of not more than 2.0% and a balance of Fe and unavoidable impurities, wherein the shell has a content of P: not more than 0.01%, S: not more than 0.01%, C: 0.015 to 0.025%, Si: not more than 0.02%, Mn: The remainder includes Fe and unavoidable impurities.

Also, according to an embodiment of the present invention, the welded portion welded with the high-manganese steel using the flux cored arc welding material for high-manganese steel may have an impact toughness value of at least 50 J / mm at -29 ° C.

According to an embodiment of the present invention, the welded portion may have a yield strength of 380 MPa or more, a tensile strength of 600 MPa or more, and an elongation of 30% or more.

It is possible to remarkably reduce the occurrence rate of cracks in the welded portion when welding the high manganese steel using the flux cored arc welding material for high manganese steel according to the embodiments of the present invention.

1 is a photograph of a cross section of a welded portion welded using a high-manganese steel as a base material by using a flux cored arc welding material for a high manganese steel according to an embodiment of the present invention.
FIG. 2 is a photograph of a cross section of a welded portion welded using a high-manganese steel as a base material using a conventional flux cored arc welding material by an optical microscope.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.
The present invention relates to a flux cored wire filled with a flux inside a welding wire sheath, wherein the welding material includes a sheath and means a metal composition of the entire flux cored wire.

The flux cored arc welding material for a high manganese steel according to an embodiment of the present invention comprises 0.05 to 0.30% of C, 0.4 to 0.7% of Si, 3.0 to 10.0% of Mn, 0.02% or less of P, S: 0.01% or less, Ni: 3.0 to 7.0%, Cr: 10.0 to 18.0%, Mo: 3.0% or less, Cu: 2.0% or less and the balance of Fe and unavoidable impurities.

Hereinafter, the characteristics and the composition range of each alloy element will be described in detail.

C: 0.05 to 0.30%

C is a strong element as an austenite stabilizing element which ensures the strength of the welded portion and ensures the impact toughness of the welded portion. If the content of C exceeds 0.30%, the process compound is excessively formed during welding to promote high-temperature cracking, weld fume and spatter generation, and it is combined with alloying elements such as manganese and chromium to form MC, M 23 C 6 And the impact toughness is lowered.

Si : 0.4 to 0.7%

Si is an element added for maximizing the effect of combined deoxidation and spreading of weld beads together with Mn at the time of welding. If the content of Si is insufficient (less than 0.4%), the flowability of the welded portion may be deteriorated. On the other hand, if the content of Si exceeds 0.7%, segregation or the like in the welded portion may be caused to lower impact toughness, So that there is a problem that the weld cracking susceptibility is adversely affected.

Mn: 3.0 to 10.0%

Mn is a main element for the formation of austenite, which reacts with oxygen and sulfur during welding to perform deoxidation and desulfurization. Mn is an element with a high solid solubility of C, and as a certain amount of Mn is added, the solubility of C during the welding of a base material containing a large amount of C can be increased and the cracking rate during welding can be lowered. If the content of Mn is less than 3.0%, a sufficient austenite is not generated and the strength is lowered. As a result, C can not be sufficiently solidified, resulting in an increase in cracking rate during welding. On the other hand, when the content of Mn exceeds 10.0%, segregation occurs excessively, causing high-temperature cracking, and harmful fumes may be generated.

P: not more than 0.02%, S: not more than 0.01%

Since P and S easily produce a low melting point compound by adding a trace amount of the material, the melting point of the material is lowered and the susceptibility to hot cracking is increased. Therefore, it is preferable that P and S are not included as much as possible. Inevitably, P and S are not more than 0.02% , And more preferably, both P and S are limited to not exceed 0.01%.

Ni : 3.0 to 7.0%

Ni is a component added as an austenite stabilizing element. Adding 3.0% or more Ni increases the impact toughness because the weld plays a role in increasing the stacking fault energy (SFE) in the weld, thereby increasing impact toughness. On the other hand, Ni is not only an element for lowering the strength of the welded portion but also an element for increasing the cost of the welded material, so that it is more preferable to limit the Ni to 7.0% or less.

Cr : 10.0 to 18.0%

Cr is an element which improves oxidation resistance and strength as a ferrite stabilizing element. When Cr is added in an amount of less than 10.0%, sufficient oxidation resistance and strength can not be secured. When Cr is added in an amount exceeding 18.0%, ferrite and chromium carbide are formed at a high temperature, and toughness is deteriorated.

Mo : Not more than 3.0% (more than 0)

Mo can be added for the purpose of improving the strength, and it is an element for increasing the strength by finely precipitating a Mo-type carbide. When the Mo content is 0.01% or more, the strength improving effect can be obtained. Such precipitates cause a decrease in impact toughness at low temperatures and high temperatures, and when it exceeds 3.0%, it is preferable that the precipitates do not exceed the lower limit of ductility.

Cu: not more than 2.0% (more than 0)

Cu is also a component added together with Ni as an austenite stabilizing element. The addition of Cu increases the impact toughness, but when it exceeds 2.0%, the crack sensitivity increases, so it is preferable not to exceed it.

The flux cored arc welding material for a high manganese steel according to an embodiment of the present invention comprises a flux cored wire filled with a flux in an outer shell and an outer shell.

Wherein the shell has a composition of P: not more than 0.01%, S: not more than 0.01%, C: 0.015 to 0.025%, Si: not more than 0.02%, Mn: not more than 0.2%, the balance being Fe and unavoidable impurities .

The shell of a flux cored arc welding material for welding stainless steel to an existing nonmagnetic steel material contains 0.08% or less of C, 0.08% or less of Si, 2.0% or less of Mn, 0.04% or less of P, 0.03% or less of S , Ni: 8 to 11%, and Cr: 18 to 20%.

The welded portion welded using the high-manganese steel as the base material using the welding material containing the above-mentioned component system may have an impact toughness value of not less than 50 J / mm at -29 캜.

The welded portion may have a yield strength of 380 MPa or more, a tensile strength of 600 MPa or more, and an elongation of 30% or more.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example

The high manganese steel containing 0.4% of C, 22% of Mn, 0.3% of Si, 0.03% of P and 0.01% of S at 0.01% The flux cored arc welding (FCAW) was carried out using a wire at an input heat quantity of 1.5 kJ / mm. The FCAW current, voltage, welding speed, and interlayer temperature were measured under the conditions shown in Table 2 below.

C Si Mn P S Ni Cr Mo Cu Example 1 0.103 0.619 3.419 0.001 0.008 5.752 17.21 0.02 0.01 Example 2 0.223 0.481 9.762 0.007 0.007 3.629 10.74 0.01 0.01 Example 3 0.152 0.523 6.421 0.014 0.009 4.923 11.65 2.52 0.01 Example 4 0.092 0.498 5.521 0.012 0.009 6.572 16.23 0.04 1.98 Example 5 0.251 0.523 4.231 0.008 0.002 4.352 15.23 0.02 0.07 Comparative Example 1 0.078 0.706 5.350 0.021 0.003 7.772 16.72 0.04 0.12 Comparative Example 2 0.181 0.526 9.436 0.022 0.004 5.102 11.94 0.02 0.08 Comparative Example 3 0.210 0.324 7.463 0.019 0.004 6.762 13.42 0.03 0.10 Comparative Example 4 0.174 0.542 9.1 0.022 0.005 5.299 12.16 0.024 0.08

Base material thickness (mm) Welding posture Welding polarity Protective gas Current (A) Voltage (V) Welding speed (cpm) Interlayer temperature (캜) Plate butt joint 12 Flat DC (+) 100% CO 2 180 ~ 220 25-28 20 to 35 Max. 150

The mechanical properties of the weld formed after the flux cored arc welding were measured and are shown in Table 3 below.

The yield strength, the tensile strength and the elongation after the tensile test of the welded specimen were measured, and the results are shown in Table 3 below. Impact toughness among the above mechanical properties was evaluated by the Charpy impact test (-29 ° C) and the impact absorption energy (vE) of the welded portion.

Weld crack Impact Toughness Value (-29 ° C) (J / mm) Yield strength (MPa) Tensile Strength (MPa) Elongation (%) Example 1 Good 68 385 612 31.2 Example 2 Good 72 423 643 39.2 Example 3 Good 52 412 632 34.2 Example 4 Good 54 395 616 35.2 Example 5 Good 67 445 693 33.2 Comparative Example 1 crack - - - - Comparative Example 2 crack - - - - Comparative Example 3 crack - - - - Comparative Example 4 crack - - - -

1 is a photograph of a cross section of a welded portion welded using a high-manganese steel as a base material by using a flux cored arc welding material for a high manganese steel according to an embodiment of the present invention. FIG. 2 is a photograph of a cross section of a welded portion welded using a high-manganese steel as a base material using a conventional flux cored arc welding material by an optical microscope.

FIG. 1 shows that cracks do not occur in the welded portion as a result of observing the cross-section of the welded portion after welding between the high-manganese portions using the welding material of Embodiment 1. FIG. In contrast, FIG. 2 shows a result of observation of the cross-section of a welded portion after welding between high-manganese using the welding material of Comparative Example 1. As a result, it was confirmed that cracks occurred in the welded portion.

Referring to the above description, the welded portion welded using the high-manganese steel as the base material using the flux cored arc welding material for high manganese steel according to an embodiment of the present invention has an impact toughness value of not less than 50 J / mm at -29 ° C , A yield strength of 380 MPa or more, a tensile strength of 600 MPa or more, and an elongation of 30% or more, and no crack is generated in the welded portion.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited thereto. Those skilled in the art will readily obviate modifications and variations within the spirit and scope of the appended claims. It will be understood that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

Claims (3)

A flux cored arc welding material comprising an outer jacket and a flux cored wire filled with a flux inside the jacket,
Wherein the flux cored wire comprises 0.05 to 0.30% of C, 0.4 to 0.7% of Si, 3.0 to 10.0% of Mn, 0.02% or less of P, 0.01% or less of S, 3.0 to 7.0% of Ni, 10.0 to 18.0% of Cr, 3.0% or less (more than 0%) of Mo, 2.0% or less (more than 0%) of Cu and Fe and unavoidable impurities,
Wherein said shell comprises a flux cored arc for high manganese steel containing 0.01% or less of P, 0.01% or less of S, 0.015 to 0.025% of C, 0.02% or less of Si, 0.2% or less of Mn and the balance of Fe and unavoidable impurities Welding materials. The method according to claim 1,
A flux cored arc welding material for high manganese steel having an impact toughness value of at least 50 J / mm at -29 ° C using the high manganese steel as the base material using the flux cored arc welding material for the high manganese steel. 3. The method of claim 2,
The welded portion is a flux cored arc welding material for a high manganese steel having a yield strength of 380 MPa or more, a tensile strength of 600 MPa or more, and an elongation of 30% or more.

KR1020160177631A 2016-12-23 2016-12-23 Flux cored arc welding material for high manganese steel KR101869423B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190070710A (en) * 2017-12-13 2019-06-21 주식회사 포스코 Flux cored arc weld material and welded joint using the same
KR102221969B1 (en) * 2020-03-24 2021-03-02 현대로템 주식회사 Solid Wire for Automatic Welding with Excellent High-speed Weldability
CN112894199A (en) * 2021-01-20 2021-06-04 浙江鸿途焊接科技有限公司 Consumable electrode gas shielded welding flux-cored wire for ultralow-temperature high manganese steel
KR102269556B1 (en) * 2020-08-28 2021-06-28 주식회사 포스코플랜텍 Butt welding method for minimizing welding defect of high Mn-Annular plate
KR20230132902A (en) 2022-03-10 2023-09-19 주식회사 세아에삽 Stainless steel flux cored wire for High Mn steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6254594A (en) * 1985-08-31 1987-03-10 Aichi Steel Works Ltd Welding method for high-mn non-magnetic steel
KR100188144B1 (en) 1997-01-15 1999-06-01 삼성전자주식회사 Apparatus of measuring display units
DE19908034A1 (en) * 1999-02-24 2000-09-07 Howaldtswerke Deutsche Werft Filled welding wire for MAG welding corrosion-resistant, non-magnetizable, high alloy steels produces a weld metal with specified high manganese, chromium, molybdenum and nickel contents
KR101560897B1 (en) * 2013-12-06 2015-10-15 주식회사 포스코 Welded joint having high strength and superior toughness at ultra low temterature
KR20160078621A (en) * 2014-12-24 2016-07-05 주식회사 포스코 Tungsten inert gas welding material for high manganese steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6254594A (en) * 1985-08-31 1987-03-10 Aichi Steel Works Ltd Welding method for high-mn non-magnetic steel
KR100188144B1 (en) 1997-01-15 1999-06-01 삼성전자주식회사 Apparatus of measuring display units
DE19908034A1 (en) * 1999-02-24 2000-09-07 Howaldtswerke Deutsche Werft Filled welding wire for MAG welding corrosion-resistant, non-magnetizable, high alloy steels produces a weld metal with specified high manganese, chromium, molybdenum and nickel contents
KR101560897B1 (en) * 2013-12-06 2015-10-15 주식회사 포스코 Welded joint having high strength and superior toughness at ultra low temterature
KR20160078621A (en) * 2014-12-24 2016-07-05 주식회사 포스코 Tungsten inert gas welding material for high manganese steel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190070710A (en) * 2017-12-13 2019-06-21 주식회사 포스코 Flux cored arc weld material and welded joint using the same
KR102045634B1 (en) 2017-12-13 2019-11-15 주식회사 포스코 Flux cored arc weld material and welded joint using the same
KR102221969B1 (en) * 2020-03-24 2021-03-02 현대로템 주식회사 Solid Wire for Automatic Welding with Excellent High-speed Weldability
KR102269556B1 (en) * 2020-08-28 2021-06-28 주식회사 포스코플랜텍 Butt welding method for minimizing welding defect of high Mn-Annular plate
CN112894199A (en) * 2021-01-20 2021-06-04 浙江鸿途焊接科技有限公司 Consumable electrode gas shielded welding flux-cored wire for ultralow-temperature high manganese steel
KR20230132902A (en) 2022-03-10 2023-09-19 주식회사 세아에삽 Stainless steel flux cored wire for High Mn steel

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