CN109530964A - A kind of high efficiency metal powder-cored wire suitable for ultralow temperature potassium steel - Google Patents
A kind of high efficiency metal powder-cored wire suitable for ultralow temperature potassium steel Download PDFInfo
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- CN109530964A CN109530964A CN201811602479.0A CN201811602479A CN109530964A CN 109530964 A CN109530964 A CN 109530964A CN 201811602479 A CN201811602479 A CN 201811602479A CN 109530964 A CN109530964 A CN 109530964A
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- steel
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Classifications
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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
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention discloses a kind of high efficiency metal powder-cored wires for ultralow temperature potassium steel, the high efficiency metal powder-cored wire is made of steel band and metal powder medicine core, the chemical constituent of its steel band is: C is 0.20 ~ 0.23wt%, Si is 0.03 ~ 0.05wt%, Mn is 6 ~ 8wt%, P≤0.002wt%, S≤0.001wt%, surplus are Fe and inevitable impurity；The chemical constituent of its metal-powder-core is: electrolytic manganese is 18 ~ 20wt%, manganese-silicon is 3 ~ 4wt%, nickel powder is 8 ~ 10wt%, low-carbon ferrochromium is 6 ~ 8wt%, tungsten powder is 4 ~ 6wt%, and potassium feldspar is 2.0 ~ 3.0%wt%, and surplus is iron powder, component total content is 100%, and the present invention is able to satisfy the technical requirements of intensity and ultralow-temperature flexibility to the LNG basin welded.
Description
Technical field
The present invention relates to a kind of high efficiency metal powder-cored wires suitable for ultralow temperature potassium steel.
Background technique
As China implements the "Oceanic" strategy and new energy strategy, development and application liquefied petroleum gas (LPG) and liquefaction are natural
The demand of gas (LNG), liquefied petroleum gas (LPG) and liquefied natural gas (LNG) storage and transport container steel will be increasingly
Greatly.The operating temperature of low-temperature steel currently used for LNG basin is -196 DEG C, and commercially with for 9Ni steel, steel plate is expensive.For section
Ni resource, the cost for reducing steel material and energy storage and transportation cost are saved, is usually prepared using cheap other members super
Cryogenic steel has become trend.Because manganese element has metallurgical physical property identical with nickel element, and it is cheap, ultralow temperature is high
Manganese steel has become the preferred material of substitution 9Ni steel, has biggish market prospects.
For ultralow temperature potassium steel when manufacturing the storage shipping container such as LNG, welding procedure is still main connection method,
In, submerged arc soldering method is common welding method, the welding wire for needing to match.Submerged-arc welding is divided into two kinds: solid core welding wire and metal
Powder core flux-cored wire, metal powder-cored wire have welding efficiency more higher than solid core welding wire.Currently, market have not seen it is applicable
In the metal powder-cored wire used for submerged arc welding of ultralow temperature potassium steel, this will be the bottle for realizing high efficiency welding ultralow temperature potassium steel
One of neck.
Summary of the invention
The technical problem to be solved by the present invention is to provide one kind and be suitable for for the above disadvantage of the existing technology
The high efficiency metal powder-cored wire of ultralow temperature potassium steel, the weld metal which forms are low
Warm good-toughness, intensity match with ultralow temperature potassium steel, are able to satisfy intensity and ultralow-temperature flexibility to the LNG basin welded
Technical requirements.
The technical solution that the present invention solves the above technical problem is: a kind of high efficiency gold for ultralow temperature potassium steel
Belong to powder core flux-cored wire, which is made of steel band and metal powder medicine core, the change of steel band
Learn component be: C be 0.20 ~ 0.23wt%, Si be 0.03 ~ 0.05wt%, Mn be 6 ~ 8wt%, P≤0.002wt%, S≤0.001wt%,
Surplus is Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese is 18 ~ 20wt%, and manganese-silicon is 3 ~ 4wt%, and nickel powder is 8 ~ 10wt%, low
Carbon ferrochrome is 6 ~ 8wt%, and tungsten powder is 4 ~ 6wt%, and potassium feldspar is 2.0 ~ 3.0%wt%, and surplus is iron powder, and component total content is 100%.
The present invention also provides a kind of high efficiency metal powder-cored wire preparation method for ultralow temperature potassium steel,
Specifically includes the following steps:
S1: it is mixed according to above-mentioned metal powder medicine core each component by its percentage；
S2: steel band rolling is rolled into U-shaped section, the S1 metal powder flux cored filler mixed is entered in U-shaped metallic channel, steel band rolls volume again
It is sealed with docking 0 type sealing mode, filling raw material being rolled in tubular welding wire tightly；
S3: the welding wire for being rolled into cast forms metal powder-cored wire using drawing.
Metal powder-cored wire of the present invention passes through full-automatic buried arc welding method and welds for ultralow temperature potassium steel,
Using matching solder flux model INCOFLUX9 when full-automatic submerged arc welding, welding condition is as follows: it is not preheated before weldering,
Interlayer temperature≤150 DEG C, welding current are 440 ~ 450A, and arc voltage is 28 ~ 30V, and speed of welding is 35 ~ 36cm/min, weldering
Connecing heat input is 20 ~ 22kJ/cm；
The mechanical property for the ultralow temperature steel that the present invention welds is: tensile strength is >=400MPa, and yield strength is >=560MPa, is prolonged
Stretch rate A=40%；Impact energy Ak v >=54J at -20196 DEG C.
The present invention further limits scheme:
The chemical constituent of its steel band above-mentioned is: C 0.22wt%, Si 0.04wt%, Mn 7.2wt%, P 0.002wt%, S
For 0.001wt%, surplus is Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 19wt%, manganese-silicon 3.4wt%, nickel powder 9.2wt%, low-carbon chromium
Iron is 6.4wt%, tungsten powder 5.3wt%, potassium feldspar 2.1wt%, and surplus is iron powder, and component total content is 100%.
The chemical constituent of its steel band above-mentioned is: C 0.24wt%, Si 0.025wt%, Mn 5.6wt%, P are
0.0015wt%, S 0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 23wt%, manganese-silicon 2.5wt%, nickel powder 7.2wt%, low-carbon chromium
Iron is 5.4wt%, tungsten powder 3.6wt%, potassium feldspar 1.5wt%, and surplus is iron powder, and component total content is 100%.
The chemical constituent of its steel band above-mentioned is: C 0.28wt%, Si 0.014wt%, Mn 4.7wt%, P are
0.0016wt%, S 0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 26wt%, manganese-silicon 1.7wt%, nickel powder 5.8wt%, low-carbon chromium
Iron is 4.5wt%, tungsten powder 2.4wt%, potassium feldspar 0.8wt%, and surplus is iron powder, and component total content is 100%.
The beneficial effects of the present invention are:
Steel band that the present invention uses and the common alloy transition of metal powder, Mn content is 20 ~ 28wt% in the weld metal of formation, with
The manganese content of base material is suitable, ensure that the component system essentially identical with base material, when forming welding point, avoids manganese element
Diffusion is formed by the variation of microstructure and mechanical property near melt run；
Manganese element and carbon, nickel element in the present invention are all austenite former, and collective effect is in weld metal molten bath
When solidification, it is solidification initial phase with austenite phase, is always maintained at room temperature, forms the weld metal of austenite structure, therefore this hair
Carbon content in bright middle steel band is 0.20 ~ 0.30wt%, and low-carbon ferrochromium is 3 ~ 8wt%, and nickel powder is 4 ~ 10wt%；
The present invention, to reduce solidification cracking tendency, adds the tungsten of 2 ~ 6wt% in the weld metal solidification based on austenite phase
Powder, to reduce solidification temperature range, so that the appearance of solidification cracking is effectively reduced and avoid, in addition, impurity element sulphur and phosphorus
Presence, so that weld metal is generated liquation crack and reheat crack(ing), therefore the content of strict control sulphur of the present invention, P elements: P≤
0.002wt%, S≤0.001wt%；
The chemical component system that the present invention uses, makes weld structure full austenite, and it is excellent not only to ensure that weld metal has
Good ultralow-temperature flexibility and enough intensity；And reduce solidification temperature range, avoid the appearance of solidification cracking, at the same reduce or
Prevent the generation of liquation crack and reheat crack(ing)；
High efficiency metal powder-cored wire prepared by the present invention is used to prepare the weldering of the ultralow temperature potassium steel of LNG basin
It connects, weld metal forms fully austenitic structure, ensure that the excellent ultralow-temperature flexibility of weld metal, Impact energy Ak v at -196 DEG C
For 72 ~ 98J；Also ensure that the mechanical performance of weld metal: yield strength is 420 ~ 450MPa, tensile strength is 610 ~
690MPa, elongation percentage A are 31 ~ 38%, meet the mechanical property requirements of the LNG basin manufactured with ultralow temperature potassium steel and ultralow
The requirement of warm toughness,
Therefore, the alloying element price that the present invention uses is low, alloying component system is simple, and welding efficiency is high；What is prepared is described complete
The weld metal excellent in low temperature toughness that automatic submerged-arc welding solid core welding wire is formed, intensity match with ultralow temperature potassium steel, meet
The technical requirements of intensity and ultralow-temperature flexibility to the LNG basin welded.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of high efficiency metal powder-cored wire suitable for ultralow temperature potassium steel, the efficient submerged arcs
Weldering metal powder-cored wire is made of steel band and metal powder medicine core, and the chemical constituent of steel band is: C 0.22wt%, Si are
0.04wt%, Mn 7.2wt%, P 0.002wt%, S 0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 19wt%, manganese-silicon 3.4wt%, nickel powder 9.2wt%, low-carbon chromium
Iron is 6.4wt%, tungsten powder 5.3wt%, potassium feldspar 2.1wt%, and surplus is iron powder, and component total content is 100%.
The weld metal microstructure and mechanical property of the present embodiment postwelding are tested and analyzed: weld metal is full Ovshinsky
Body tissue；There is no solidification cracking and reheat crack(ing) to generate；The yield strength of weld metal is 427MPa, and tensile strength is
623MPa, elongation A=36%, ballistic work average value Akv=96J at -196 DEG C.
Embodiment 2
The present embodiment provides a kind of high efficiency metal powder-cored wire suitable for ultralow temperature potassium steel, the efficient submerged arcs
Weldering metal powder-cored wire is made of steel band and metal powder medicine core, and the chemical constituent of steel band is: C 0.24wt%, Si are
0.025wt%, Mn 5.6wt%, P 0.0015wt%, S 0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 23wt%, manganese-silicon 2.5wt%, nickel powder 7.2wt%, low-carbon chromium
Iron is 5.4wt%, tungsten powder 3.6wt%, potassium feldspar 1.5wt%, and surplus is iron powder, and component total content is 100%.
Test and analyze to the weld metal microstructure and mechanical property of the present embodiment postwelding: weld metal is complete difficult to understand
Family name's body tissue；There is no solidification cracking and reheat crack(ing) to generate；The yield strength of weld metal is 446MPa, and tensile strength is
683MPa, elongation A=32%, ballistic work average value Akv=72J at -196 DEG C.
Embodiment 3
The present embodiment provides a kind of high efficiency metal powder-cored wire suitable for ultralow temperature potassium steel, the efficient submerged arcs
Weldering metal powder-cored wire is made of steel band and metal powder medicine core, and the chemical constituent of steel band is: C 0.28wt%, Si are
0.014wt%, Mn 4.7wt%, P 0.0016wt%, S 0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 26wt%, manganese-silicon 1.7wt%, nickel powder 5.8wt%, low-carbon chromium
Iron is 4.5wt%, tungsten powder 2.4wt%, potassium feldspar 0.8wt%, and surplus is iron powder, and component total content is 100%.
Test and analyze to the weld metal microstructure and mechanical property of the present embodiment postwelding: weld metal is complete difficult to understand
Family name's body tissue；There is no solidification cracking and reheat crack(ing) to generate；The yield strength of weld metal is 438MPa, and tensile strength is
643MPa, elongation A=34%, ballistic work average value Akv=83J at -196 DEG C.
The results showed that the present embodiment 1-3, after full-automatic submerged arc welding, the mechanical property of weld metal is complete
Meet the technical requirements of ultralow temperature potassium steel, welding point meets the technical requirements of LNG basin.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (4)
1. a kind of high efficiency metal powder-cored wire suitable for ultralow temperature potassium steel, the high efficiency metal-powder-core
Flux-cored wire is made of steel band and metal powder medicine core, it is characterised in that: the chemical constituent of its steel band is: C is 0.20 ~ 0.23wt%,
Si is 0.03 ~ 0.05wt%, and Mn is 6 ~ 8wt%, P≤0.002wt%, S≤0.001wt%, and surplus is Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese is 18 ~ 20wt%, and manganese-silicon is 3 ~ 4wt%, and nickel powder is 8 ~ 10wt%, low
Carbon ferrochrome is 6 ~ 8wt%, and tungsten powder is 4 ~ 6wt%, and potassium feldspar is 2.0 ~ 3.0%wt%, and surplus is iron powder, and component total content is 100%.
2. being suitable for the high efficiency metal powder-cored wire of ultralow temperature potassium steel, feature as described in claim 1
Be: the chemical constituent of its steel band is: C 0.22wt%, Si 0.04wt%, Mn 7.2wt%, P 0.002wt%, S are
0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 19wt%, manganese-silicon 3.4wt%, nickel powder 9.2wt%, low-carbon chromium
Iron is 6.4wt%, tungsten powder 5.3wt%, potassium feldspar 2.1wt%, and surplus is iron powder, and component total content is 100%.
3. being suitable for the high efficiency metal powder-cored wire of ultralow temperature potassium steel, feature as described in claim 1
Be: the chemical constituent of its steel band is: C 0.24wt%, Si 0.025wt%, Mn 5.6wt%, P 0.0015wt%, S are
0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 23wt%, manganese-silicon 2.5wt%, nickel powder 7.2wt%, low-carbon chromium
Iron is 5.4wt%, tungsten powder 3.6wt%, potassium feldspar 1.5wt%, and surplus is iron powder, and component total content is 100%.
4. being suitable for the high efficiency metal powder-cored wire of ultralow temperature potassium steel, feature as described in claim 1
It is:
The chemical constituent of its steel band is: C 0.28wt%, Si 0.014wt%, Mn 4.7wt%, P 0.0016wt%, S are
0.001wt%, surplus are Fe and inevitable impurity；
The chemical constituent of its metal-powder-core is: electrolytic manganese 26wt%, manganese-silicon 1.7wt%, nickel powder 5.8wt%, low-carbon chromium
Iron is 4.5wt%, tungsten powder 2.4wt%, potassium feldspar 0.8wt%, and surplus is iron powder, and component total content is 100%.
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|---|---|---|---|
| CN201811602479.0A CN109530964B (en) | 2018-12-26 | 2018-12-26 | Efficient submerged-arc welding metal powder-cored flux-cored wire suitable for ultralow-temperature high-manganese steel |
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| CN201811602479.0A CN109530964B (en) | 2018-12-26 | 2018-12-26 | Efficient submerged-arc welding metal powder-cored flux-cored wire suitable for ultralow-temperature high-manganese steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110653515A (en) * | 2019-10-31 | 2020-01-07 | 洛阳双瑞特种合金材料有限公司 | Seamless submerged arc flux-cored wire for welding high manganese steel LNG storage tank |
| CN110653518A (en) * | 2019-10-29 | 2020-01-07 | 洛阳双瑞特种合金材料有限公司 | Seamless flux-cored wire for high-manganese low-temperature steel of LNG storage tank and preparation method |
| CN111790999A (en) * | 2020-06-28 | 2020-10-20 | 昆山京群焊材科技有限公司 | Flux combination of metal powder core submerged arc welding wire for 25Mn austenitic steel |
| CN112894198A (en) * | 2021-01-20 | 2021-06-04 | 浙江鸿途焊接科技有限公司 | Self-protection flux-cored wire for ultralow-temperature high-manganese steel |
| 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 |
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| CN110653518A (en) * | 2019-10-29 | 2020-01-07 | 洛阳双瑞特种合金材料有限公司 | Seamless flux-cored wire for high-manganese low-temperature steel of LNG storage tank and preparation method |
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| CN112894198A (en) * | 2021-01-20 | 2021-06-04 | 浙江鸿途焊接科技有限公司 | Self-protection flux-cored wire for ultralow-temperature high-manganese steel |
| 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 |
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