CN111590237A - Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof - Google Patents
Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof Download PDFInfo
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- CN111590237A CN111590237A CN202010456712.XA CN202010456712A CN111590237A CN 111590237 A CN111590237 A CN 111590237A CN 202010456712 A CN202010456712 A CN 202010456712A CN 111590237 A CN111590237 A CN 111590237A
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- manganese steel
- ultralow
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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
- B23K35/22—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
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- 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
- B23K35/40—Making wire or rods for soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses an arc welding electrode of ultralow-temperature high-manganese steel and a preparation method thereof, wherein the arc welding electrode comprises the following raw materials in parts by weight: 0.30-0.75 wt% of C, 19-25 wt% of Mn, 3.5-5.5 wt% of Ni, 3.0-5.5 wt% of Cr, 3.5-5.5 wt% of Mo, 2.5-4.0 wt% of W, less than or equal to 0.010 wt% of P, less than or equal to 0.006 wt% of S, and the balance of Fe and inevitable impurities. The raw materials are hot rolled into wire rods, then are annealed and drawn to straight strips, and are wrapped with coating with specific components to prepare the welding rod. The welding rod prepared by the raw materials has low cost and simple alloy component system; the formed weld metal has the characteristics of ultralow temperature and high toughness, the strength is matched with that of ultralow temperature high manganese steel, and a welded joint has the mechanical properties of high strength and excellent ultralow temperature toughness.
Description
Technical Field
The invention relates to a high manganese steel welding rod and preparation thereof, in particular to ultralow temperature high manganese steel and a preparation method thereof.
Background
The demand for steel materials for low-temperature or ultra-low-temperature storage and transportation containers such as Liquefied Natural Gas (LNG) is on the rise. At present, the steel used for LNG tanks is commercial 9Ni steel, which is expensive due to the high nickel content of up to 9%. In order to save Ni resources and reduce the cost of steel materials and the cost of energy storage and transportation, researchers are actively developing ultra-low temperature high manganese steel.
In the application process of the ultralow-temperature high-manganese steel, when a welding process is adopted to prepare a structure and equipment, manual arc welding is a common welding method, and at present, no steel raw material for preparing a manual arc welding electrode matched with the high-manganese low-temperature steel exists.
At present, the ultra-low temperature storage and transportation container is generally made of 9Ni steel, and the welding rods matched with the ultra-low temperature storage and transportation container are nickel-based welding rods, so that two problems exist: firstly, the nickel element content in the welding wire is 50-60%, and the price is high; secondly, the components of the base metal and the welding wire belong to different component systems, and the alloy content difference is large, so that element diffusion at a welding line of a welding joint can be caused, and the structure and the performance are changed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an arc welding electrode for ultralow-temperature high-manganese steel, which solves the problem that the existing nickel-based electrode is easy to cause element diffusion at a fusion line of a welding joint to influence the structure performance because no electrode is suitable for the ultralow-temperature high-manganese steel.
The technical scheme is as follows: the invention relates to an arc welding electrode for ultralow-temperature high-manganese steel, which comprises the following raw materials in parts by weight: 0.30-0.75 wt% of C, 19-25 wt% of Mn, 3.5-5.5 wt% of Ni, 3.0-5.5 wt% of Cr, 3.5-5.5 wt% of Mo, 2.5-4.0 wt% of W, less than or equal to 0.010 wt% of P, less than or equal to 0.006 wt% of S, and the balance of Fe and inevitable impurities.
The invention relates to a preparation method of a manual electric arc welding electrode for ultralow-temperature high manganese steel.
Wherein, the chemical components of the coating comprise: 36 wt% of marble, 22 wt% of fluorite, 4 wt% of quartz sand, 4.5 wt% of zircon sand, 6 wt% of rutile, 10 wt% of ferrotitanium, 6 wt% of low-carbon ferromanganese, 6 wt% of ferrosilicon, 1.4 wt% of rare ferrosilicon, 2.9 wt% of synthetic mica and 1.2 wt% of soda. The hot rolling adopts 1200 ℃ heating and 1100 ℃ rolling. The specification of the wire rod is phi 5.5mm, and the specification of the straight rod is phi 4.0 mm.
Has the advantages that: the invention has simple alloy component system and low preparation cost, the formed weld metal has the same manganese content as the ultralow temperature high manganese steel, the component system which is basically the same as the base metal is ensured, the microstructure and the mechanical property near a fusion line formed by the diffusion of manganese elements are prevented from changing when a welding joint is formed, and the adopted chemical component system ensures that the weld metal structure is fully austenitic, thereby not only ensuring that the weld metal has excellent ultralow temperature toughness and enough strength, but also reducing the solidification temperature range, avoiding the occurrence of solidification cracks, and simultaneously reducing or preventing the occurrence of liquefaction cracks and reheating cracks.
Detailed Description
The present invention will be further illustrated with reference to the following examples.
Example 1
An arc welding electrode for ultralow temperature high manganese steel comprises the following raw materials in percentage by weight: 0.45 wt% of C, 21 wt% of Mn, 4.5 wt% of Ni, 3.7 wt% of Cr, 4.4 wt% of Mo, 3.1 wt% of W, 0.010 wt% or less of P, 0.006 wt% or less of S, and the balance of Fe and inevitable impurities.
The raw materials are hot rolled into a wire rod with a phi 5.5mm specification, annealed and drawn into a straight rod with a phi 4.0mm specification, and coated with a coating with specific components to prepare the welding rod.
When the ultra-low temperature high manganese steel with the thickness of 16mm is welded by the welding rod by adopting a manual electric arc welding method:
the chemical components of the ultralow-temperature high manganese steel are as follows: 0.40 to 0.50 wt% of C, 0.10 to 0.20 wt% of Si, 20 to 28 wt% of Mn, 0.01 to 0.08 wt% of N, 0.005 wt% or less of P, and 0.003 wt% or less of S. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the tensile strength is more than or equal to 400MPa, the yield strength is more than or equal to 560MPa, and the elongation A is 40 percent; the impact energy Akv is more than or equal to 54J at the temperature of 196 ℃ below zero. The groove type of the test plate of the ultra-low temperature high manganese steel is X-shaped, and the angle of a single-side groove is 30 degrees. The welding current is 189-190A, the arc voltage is 24-25V, the welding speed is 2.19-2.35cm/s, and the welding line energy is 20-21 kJ/cm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a fully austenitic structure; no solidification crack and reheating crack are generated; the yield strength of the weld metal is 446-455 MPa, the tensile strength is 679-685 MPa, the elongation A is 38-40%, and the average value Akv of the impact energy at-196 ℃ is 77-86J.
The experimental results of this example show that: after the low-hydrogen type welding rod for manual electric arc welding suitable for the ultralow-temperature high-manganese steel and prepared by adopting the steel raw materials in the embodiment is welded by the manual electric arc welding, the mechanical property of weld metal completely meets the technical requirement of the ultralow-temperature high-manganese steel, and a welding joint meets the technical requirement of the preparation structure of the ultralow-temperature high-manganese steel.
Example 2
An arc welding electrode for ultralow temperature high manganese steel comprises the following raw materials in percentage by weight: 0.55 wt% of C, 22 wt% of Mn, 4.0 wt% of Ni, 3.3 wt% of Cr, 3.9 wt% of Mo, 3.1 wt% of W, 0.010 wt% or less of P, 0.006 wt% or less of S, and the balance of Fe and inevitable impurities.
The raw materials are hot rolled into a wire rod with the diameter of 5.5mm, and then annealed and drawn into a straight rod with the diameter of 3.2 mm.
When the ultralow-temperature high manganese steel with the thickness of 16mm is welded by the welding rod by a manual arc welding method:
the chemical components of the ultralow-temperature high manganese steel are as follows: 0.40 to 0.50 wt% of C, 0.10 to 0.20 wt% of Si, 20 to 28 wt% of Mn, 0.01 to 0.08 wt% of N, 0.005 wt% or less of P, and 0.003 wt% or less of S. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the tensile strength is more than or equal to 400MPa, the yield strength is more than or equal to 560MPa, and the elongation A is 40 percent; the impact energy Akv is more than or equal to 54J at the temperature of 196 ℃ below zero. The groove type of the test plate of the ultra-low temperature high manganese steel is X-shaped, and the angle of a single-side groove is 30 degrees. The welding current is 189-190A, the arc voltage is 24-25V, the welding speed is 2.19-2.35cm/s, and the welding line energy is 20-21 kJ/cm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a fully austenitic structure; no solidification crack and reheating crack are generated; the yield strength of the weld metal is 419-440 MPa, the tensile strength is 615-635 MPa, the elongation A is 40-42%, and the average value Akv of the impact energy at-196 ℃ is 83-89J.
Example 3
An arc welding electrode for ultralow temperature high manganese steel comprises the following raw materials in percentage by weight: 0.45 wt% of C, 23 wt% of Mn, 4.2 wt% of Ni, 4.4 wt% of Cr, 3.9 wt% of Mo, 3.7 wt% of W, 0.010 wt% or less of P, 0.006 wt% or less of S, and the balance of Fe and inevitable impurities.
The raw materials are hot rolled into a wire rod with the diameter of 5.5mm, and then annealed and drawn into a straight rod with the diameter of 2.5 mm.
When the ultralow-temperature high manganese steel with the thickness of 16mm is welded by the welding rod by a manual arc welding method:
the chemical components of the ultralow-temperature high manganese steel are as follows: 0.40 to 0.50 wt% of C, 0.10 to 0.20 wt% of Si, 20 to 28 wt% of Mn, 0.01 to 0.08 wt% of N, 0.005 wt% or less of P, and 0.003 wt% or less of S. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the tensile strength is more than or equal to 400MPa, the yield strength is more than or equal to 560MPa, and the elongation A is 40 percent; the impact energy Akv is more than or equal to 54J at the temperature of 196 ℃ below zero. The groove type of the test plate of the ultra-low temperature high manganese steel is X-shaped, and the angle of a single-side groove is 30 degrees. The welding current is 189-190A, the arc voltage is 24-25V, the welding speed is 2.19-2.35cm/s, and the welding line energy is 20-21 kJ/cm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a fully austenitic structure; no solidification crack and reheating crack are generated; the yield strength of the weld metal is 422-446 MPa, the tensile strength is 601-653 MPa, the elongation A is 40-41%, and the average value Akv of the impact energy at-196 ℃ is 88-105J.
The above examples show that: the alloy element adopted by the invention has low content price, the alloy component system is simple, the preparation cost is low, the content of the main alloy element Mn adopted by the invention is 19-25 wt%, the formed weld metal has the same content with the manganese of the ultralow-temperature high manganese steel, the component system basically same as the base metal is ensured, and the change of the structure and the performance near a fusion line formed by the diffusion of the manganese element is avoided when a welding joint is formed. The manganese element, the carbon element and the nickel element in the invention are austenite forming elements, and when a weld metal molten pool is solidified under the combined action, the austenite phase is used as a solidification initial phase and is kept to room temperature, so that weld metal with an austenite structure is formed. The weld metal has the mechanical property matched with the parent metal. According to the invention, 2.5-4.0 wt% of tungsten element is added to reduce the solidification temperature range, so that the occurrence of solidification cracks is effectively reduced and avoided. In addition, the existence of impurity elements of sulfur and phosphorus enables weld metal to generate liquefaction cracks and reheating cracks, so the invention strictly controls the contents of the sulfur and phosphorus elements: p is less than or equal to 0.010wt percent, and S is less than or equal to 0.006wt percent. The chemical component system adopted by the invention enables the weld metal structure to be fully austenitic, thereby not only ensuring that the weld metal has excellent ultralow-temperature toughness and enough strength, but also reducing the solidification temperature range, avoiding the occurrence of solidification cracks, and simultaneously reducing or preventing the occurrence of liquefaction cracks and reheating cracks. The low-hydrogen welding rod for manual electric arc welding is used for welding ultralow-temperature high-manganese steel, and weld metal forms a full austenite structure, so that excellent ultralow-temperature toughness is guaranteed, and the impact energy Akv at-196 ℃ is 77-105J; sufficient strength is also ensured: the yield strength is 419-455 MPa, the tensile strength is 601-685 MPa, the elongation A is 38-42%, and the mechanical property requirement and the ultra-low temperature toughness requirement of the ultra-low temperature high manganese steel are met.
Therefore, the welding rod prepared by the raw materials has low cost and simple alloy component system; the welding manufacturability is excellent; the formed weld metal has the characteristics of ultralow temperature and high toughness, the strength is matched with that of ultralow temperature high manganese steel, and the welded joint has the mechanical properties of high strength and excellent ultralow temperature toughness and can meet the technical requirements of the ultralow temperature high manganese steel on the strength and the ultralow temperature toughness of the weld and the welded joint.
Claims (5)
1. An arc welding electrode for ultralow-temperature high-manganese steel is characterized by comprising the following raw materials in parts by weight: 0.30-0.75 wt% of C, 19-25 wt% of Mn, 3.5-5.5 wt% of Ni, 3.0-5.5 wt% of Cr, 3.5-5.5 wt% of Mo, 2.5-4.0 wt% of W, less than or equal to 0.010 wt% of P, less than or equal to 0.006 wt% of S, and the balance of Fe and inevitable impurities.
2. The method for preparing a welding rod for manual arc welding of ultralow temperature high manganese steel as claimed in claim 1, wherein the welding rod is prepared by hot rolling the raw material into a wire rod, then annealing and drawing the wire rod into a straight rod, and coating the coating.
3. The method of making an ultra-low temperature high manganese steel stick electrode for manual arc welding of claim 2, wherein said flux coating chemistry comprises: 36 wt% of marble, 22 wt% of fluorite, 4 wt% of quartz sand, 4.5 wt% of zircon sand, 6 wt% of rutile, 10 wt% of ferrotitanium, 6 wt% of low-carbon ferromanganese, 6 wt% of ferrosilicon, 1.4 wt% of rare ferrosilicon, 2.9 wt% of synthetic mica and 1.2 wt% of soda.
4. The method for preparing an electrode for manual arc welding of ultra-low temperature high manganese steel as claimed in claim 2, wherein the hot rolling is performed by heating at 1200 ℃ and rolling at 1100 ℃.
5. The method for preparing an ultra-low temperature high manganese steel manual arc welding electrode according to claim 2, wherein the wire rod has a specification of Φ 5.5mm and the straight rod has a specification of Φ 4.0 mm.
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| CN202010456712.XA CN111590237A (en) | 2020-05-26 | 2020-05-26 | Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894197A (en) * | 2021-01-20 | 2021-06-04 | 浙江鸿途焊接科技有限公司 | Manual arc welding electrode for ultralow-temperature high-manganese steel |
| CN113458654A (en) * | 2021-06-30 | 2021-10-01 | 南京钢铁股份有限公司 | Ultralow-temperature high-manganese steel welding wire, welding rod and preparation method thereof |
| CN114227062A (en) * | 2021-12-23 | 2022-03-25 | 锦州公略焊接技术有限公司 | Welding rod deposited metal, welding rod, preparation method and application of welding rod, welding joint and welding method |
| WO2023273160A1 (en) * | 2021-06-30 | 2023-01-05 | 南京钢铁股份有限公司 | Submerged arc welding wire for ultra-low temperature high manganese steel, and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894197A (en) * | 2021-01-20 | 2021-06-04 | 浙江鸿途焊接科技有限公司 | Manual arc welding electrode for ultralow-temperature high-manganese steel |
| CN113458654A (en) * | 2021-06-30 | 2021-10-01 | 南京钢铁股份有限公司 | Ultralow-temperature high-manganese steel welding wire, welding rod and preparation method thereof |
| WO2023273160A1 (en) * | 2021-06-30 | 2023-01-05 | 南京钢铁股份有限公司 | Submerged arc welding wire for ultra-low temperature high manganese steel, and preparation method |
| CN114227062A (en) * | 2021-12-23 | 2022-03-25 | 锦州公略焊接技术有限公司 | Welding rod deposited metal, welding rod, preparation method and application of welding rod, welding joint and welding method |
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Application publication date: 20200828 |