CN106399629A - Magnesium-rare earth alloy core-spun yarn and preparation method thereof - Google Patents
Magnesium-rare earth alloy core-spun yarn and preparation method thereof Download PDFInfo
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- CN106399629A CN106399629A CN201611016233.6A CN201611016233A CN106399629A CN 106399629 A CN106399629 A CN 106399629A CN 201611016233 A CN201611016233 A CN 201611016233A CN 106399629 A CN106399629 A CN 106399629A
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 37
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 239000011777 magnesium Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 34
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 150000002910 rare earth metals Chemical class 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 10
- 229910000742 Microalloyed steel Inorganic materials 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 3
- 229910000861 Mg alloy Inorganic materials 0.000 abstract 1
- 239000012792 core layer Substances 0.000 abstract 1
- 239000011575 calcium Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 229910052593 corundum Inorganic materials 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 description 7
- 239000011572 manganese Substances 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 239000010813 municipal solid waste Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- B22F1/0003—
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an alloy powder core-spun yarn. The outer layer of a magnesium-rare earth alloy core-spun yarn is a common steel strip which is 0.3-0.5 millimeter thick; the core layer of the magnesium-rare earth alloy core-spun yarn is rare earth-magnesium alloy powder; a powder layer with a heat insulating function is arranged between the outer layer and the core part; the alloy powder consists of the following element components in percentage by mass: 9-15% of Mg, 0.5-2.5% of Ca, 1.0-2.5% of Al, 25-35% of Si, 1-2.5% of Ti, 0.5-3.5% of Ba, 2.5-5.0% of Mn, 6.0-9.0% of rare earth elements, less than or equal to 0.1% of P, less than or equal to 0.1% of S and the balance Fe. The core-spun yarn is added into micro-alloyed steel, so that a magnesium treatment process is stable and a relatively high absorption rate is obtained, and therefore, the confronting problems existed are solved better.
Description
Technical field
The present invention relates to a kind of alloyed powder core-spun yarn.
Background technology
China's steel industry is in summit period in history, it is contemplated that China's year output of steel is up in the coming years
1800000000 tons, core-spun yarn market is up to more than 5,000,000,000 yuan.Counted according to IISI, the steel of countries in the world in 2011 always produces
Amount reaches 1,600,000,000 tons, amplification 15%；And China continues to hold a post or title the first in the world with 700,000,000 tons of yield, in addition, with scientific and technical continuous
Progressive, various Structural Designs increasingly tend to high parameter, lightweight and maximization, to the desired strength of ferrous materials performance more
High, toughness is more excellent, and core-spun yarn wire feeding process technology plays indispensable very important effect to this.
Obtain more high cleanliness, the product of more high uniformity is the focus that current iron and steel produces and studies, and is also metallurgical skill
The developing direction of art.With regard to current production specifications, the control of impurity content in steel has reached higher level (in steel
Total impurities:S+P+N+H+T O≤100 × 10-6), and the reduction further with impurity content in molten steel, press from both sides in steel
The harmful effect effect that debris produce to steel products just becomes apparent from, and therefore, the different quality according to product requires to control
Just it is particularly important with the character improving steel inclusion.
The most typical, inclusions class technology that is being most widely used is the Calcium treatment of Al deoxidization steel.Calcium treatment can
So that Al2O3 in steel is mingled with the composite oxides being transformed into low melting point, is conducive to its polymerization to grow up and excludes from molten steel, not only
Can freeze anti-waterstop port, and the quantity that in steel, oxide is mingled with can be reduced；Meanwhile, it is trapped in its shape of field trash in steel
Shape is almost circular and is irregularly distributed in steel, can mitigate the harm to Steel Properties.But the problem that Calcium treatment exists
It is：Although the quantity that in steel, oxide is mingled with can be greatly reduced, often size ratio is larger for the field trash that left behind, by
It is unlikely to deform in CaO Al2O3 field trash, in the operation of rolling, micro-crack, cavity can be formed along deformation direction around field trash,
Lead to a series of deterioration of performances of steel.Particularly those have the steel grade of rigors for fatigue behaviour, aborning then not
Permission adopts Calcium treatment.The pure product made from steel requiring for higher quality, finds new inclusion modification means, to mitigate and to disappear
Except the harm caused by aluminium deoxidation steel inclusion, have become as a problem in the urgent need to address during steel products produce.
At a temperature of steel-making, magnesium not only has a fabulous affinity with oxygen and sulfur, but also have extremely strong to field trash shape
State and the control ability of size.For Al deoxidization steel, magnesium processes while reducing the dissolved oxygen in steel further, can be by steel
In Al2O3 be mingled with and be changed into dystectic MgO Al2O3, because it is existed with solid-state in molten steel, there is no the mistake that polymerization is grown up
Journey, therefore, the size that its oxide is mingled with can be very tiny, and Dispersed precipitate is in steel.Research shows MgO present in steel
Al2O3 is mingled with size and can control within 5 μm, and the mechanical property of steel is had no adverse effect substantially.Equally, add magnesium in steel to exist
While reducing sulfur content further, sulfide in steel is made presented in tiny MgS or MgS-MnS, to mitigate because of MnS folder
The miscellaneous impact that Steel Properties are brought.
Although adopting the advantage that magnesium is processed very prominent on molten steel, due to magnesium elements own characteristic（Low melting point, 650
℃；Low boiling, 1080 DEG C；High vapour pressure, is more than 2.0Mpa during 1600 DEG C of temperature of steel-making）, there is no effective magnesium addition side
Before method, in steelmaking process, molten steel is carried out with magnesium process and also there is very big difficulty.
Content of the invention
It is an object of the invention to provide a kind of magnesium-rare earth alloy core-spun yarn, this alloyed powder by using core-spun yarn method Lai
It is added in micro alloyed steel and can make magnesium processing procedure steadily and obtain higher absorption rate, so that current problems faced is obtained relatively
Good solution.
In order to realize above-mentioned purpose, present invention employs following technical scheme：
A kind of magnesium-rare earth alloy core-spun yarn, this core-spun yarn outer layer is 0.3-0.5 millimeters thick ordinary steel belts, and center portion is magnesium-rare earth
Powder, the marginal powder layer being to have heat insulating function, alloy powder is by mass percentage by elements below group
Divide and constitute：
Mg 9 ~ 15%,
Ca 0.5 ~ 2.5%,
Al 1.0 ~ 2.5%,
Si 25 ~ 35%,
Ti 1 ~ 2.5%,
Ba 0.5 ~ 3.5%,
Mn 2.5 ~ 5.0%,
Rare earth element 6.0 ~ 9.0%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
Preferably, this alloy powder is made up of elements below component by mass percentage：
Mg 10 ~ 12%,
Ca 1.0 ~ 2.0%,
Al 1.5 ~ 2.0%,
Si 28 ~ 32%,
Ti 1.5 ~ 2.0%,
Ba 1.0 ~ 3.0%,
Mn 3.0 ~ 4.0%,
Rare earth element 7.0 ~ 8.0%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
Preferably, the granularity of this alloy powder is 0.1 ~ 2.0mm.
The present invention add aluminum can crystal grain thinning, improve impact flexibility.Aluminum also has non-oxidizability and a corrosion resistance, aluminum with
Chromium, silicon share, and are remarkably improved the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance.Manganese is added not only to have enough tough
Property, and have higher intensity and hardness, improve the quenching property of steel, improve the hot-working character of steel.Titanium is added to make the interior tissue of steel
Densification, crystal grain thinning power；Reduce aging sensitivity and cold brittleness.
Ba is active element, it is possible to decrease inclusion content in melting steel content, increased the flowing of molten steel, makes molten steel more uniform.
Compound use Ca, Ba deoxidation, its product can form polynary mutual solution, reduces activity and the fusing point of deoxidation productss.Ba can play
Promote the effect of Ca, be conducive to deoxidation to carry out, make molten steel purifying effect more preferably, be conducive to steel inclusion to assemble and float.Compound
Using Ca, Ba deoxidation, product is the composite oxides of low melting point, is conducive to steel inclusion to assemble and floats.And can drop
The activity of low deoxidation productss and fusing point, are conducive to deoxidation to carry out, and make molten steel purifying effect more preferable.
The present invention is applied to core-spun yarn.Outer layer is 0.3-0.5 millimeters thick ordinary steel belts, and center portion is magnesium-rare earth powder,
The marginal powder layer being to have heat insulating function.Magnesium core spun yarn using said structure can be by adjusting powder
The thickness of layer and physical property, to adjust its heat-conducting effect, thus adjusting the temperature of magnesium heart yearn during wire feeding process, prevent it from shifting to an earlier date
Fusing vaporization, to reach the purpose that magnesium is sent into molten steel desired depth, thus can make magnesium processing procedure steadily and obtain relatively
High-absorbility, makes current problems faced preferably be solved.Processed using rare earth magnesium core spun yarn, plus magnesium process ratio adopts
Steadily, magnesium can effectively add in molten steel ordinary construction core-spun yarn containing magnesium, and obtains more stable recovery rate.Through magnesium
After process, steel inclusion type, form and size significant change.Large-sized Al2O3 is mingled with and is changed into tiny MgO
Al2O3, makes MnS in steel be mingled with presented in tiny MgS or MgS-MnS simultaneously.By using rare earth magnesium core-spun yarn
Method adding magnesium can not only solve the problems, such as that the response rate is low, but also solve the problems, such as plus magnesium during the big rolling of molten steel, open
Send out the application of rare earth magnesium core-spun yarn, there is significant economic benefit.
Specific embodiment
Embodiment 1
A kind of magnesium-rare earth alloy core-spun yarn, this core-spun yarn outer layer is 0.3-0.5 millimeters thick ordinary steel belts, and center portion is magnesium-rare earth
Powder, the marginal powder layer being to have heat insulating function, alloy powder is by mass percentage by elements below group
Divide and constitute：
Mg 10%,
Ca 2.0%,
Al 1.5%,
Si 25%,
Ti 2.0%,
Ba 3.0%,
Mn 4.0%,
Rare earth element 7.0%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
Wherein choose rare earth magnesium and ferrosilicon and other elements are smelted in a vacuum furnace.Under certain process conditions, carry out
Melting purifies, and then pours into ingot casting.Ingot casting, through broken pure one-tenth certain particle size, is overmolding to a diameter of 13 millimeters of cored using iron sheet
Line.Outer layer be 0.3-0.5 millimeters thick ordinary steel belts, center portion be magnesium-rare earth powder, marginal be have heat-insulated
The powder layer of function.This kind of core-spun yarn was inserted in molten steel with certain payingoff speed in the refine later stage, and the response rate of Mg is average
35%,
Embodiment 2
A kind of magnesium-rare earth alloy core-spun yarn, this core-spun yarn outer layer is 0.3-0.5 millimeters thick ordinary steel belts, and center portion is magnesium-rare earth
Powder, the marginal powder layer being to have heat insulating function, alloy powder is by mass percentage by elements below group
Divide and constitute：
Mg 12%,
Ca 2.5%,
Al 2.0%,
Si 30%,
Ti 25%,
Ba 2.0%,
Mn 3.0%,
Rare earth element 8.0%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
Wherein choose rare earth magnesium and ferrosilicon and other elements are smelted in a vacuum furnace.Under certain process conditions, carry out
Melting purifies, and then pours into ingot casting.Ingot casting, through broken pure one-tenth certain particle size, is overmolding to a diameter of 13 millimeters of cored using iron sheet
Line.Outer layer be 0.3-0.5 millimeters thick ordinary steel belts, center portion be magnesium-rare earth powder, marginal be have heat-insulated
The powder layer of function.This kind of core-spun yarn was inserted in molten steel with certain payingoff speed in the refine later stage, and the response rate of Mg is average
35%,
Embodiment 3
A kind of magnesium-rare earth alloy core-spun yarn, this core-spun yarn outer layer is 0.3-0.5 millimeters thick ordinary steel belts, and center portion is magnesium-rare earth
Powder, the marginal powder layer being to have heat insulating function, alloy powder is by mass percentage by elements below group
Divide and constitute：
Mg 14%,
Ca 1.5%,
Al 2.0%
Si 30%,
Ti 1.5%,
Ba 2.5%,
Mn 3.0%,
Rare earth element 7.5%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
Wherein choose rare earth magnesium and ferrosilicon and other elements are smelted in a vacuum furnace.Under certain process conditions, carry out
Melting purifies, and then pours into ingot casting.Ingot casting, through broken pure one-tenth certain particle size, is overmolding to a diameter of 13 millimeters of cored using iron sheet
Line.Outer layer be 0.3-0.5 millimeters thick ordinary steel belts, center portion be magnesium-rare earth powder, marginal be have heat-insulated
The powder layer of function.This kind of core-spun yarn was inserted in molten steel with certain payingoff speed in the refine later stage, and the response rate of Mg is average
35%.
Claims (4)
1. a kind of magnesium-rare earth alloy core-spun yarn it is characterised in that this core-spun yarn outer layer be 0.3-0.5 millimeters thick ordinary steel belts, center portion
For magnesium-rare earth powder, the marginal powder layer being to have heat insulating function, alloy powder by mass percentage by
Elements below component is constituted：
Mg 9 ~ 15%,
Ca 0.5 ~ 2.5%,
Al 1.0 ~ 2.5%,
Si 25 ~ 35%,
Ti 1 ~ 2.5%,
Ba 0.5 ~ 3.5%,
Mn 2.5 ~ 5.0%,
Rare earth element 6.0 ~ 9.0%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
2. a kind of magnesium-rare earth alloy core-spun yarn according to claim 1 is it is characterised in that percent mass pressed by this alloy powder
Constitute than by elements below component：
Mg 10 ~ 12%,
Ca 1.0 ~ 2.0%,
Al 1.5 ~ 2.0%,
Si 28 ~ 32%,
Ti 1.5 ~ 2.0%,
Ba 1.0 ~ 3.0%,
Mn 3.0 ~ 4.0%,
Rare earth element 7.0 ~ 8.0%,
P≤0.1%,
S ≤0.1%；
Fe surplus.
3. a kind of magnesium-rare earth alloy core-spun yarn according to claim 1 and 2 is it is characterised in that the granularity of this alloy powder is
0.1~2.0mm.
4. a kind of preparation method of magnesium-rare earth alloy core-spun yarn according to claim 1 and 2 is it is characterised in that wherein choose
Rare earth magnesium and ferrosilicon and other elements are smelted in a vacuum furnace；Then carry out melting purification, then pour into ingot casting；Ingot casting is through broken
Pure one-tenth certain particle size, is overmolding to a diameter of 13 millimeters of core-spun yarn using iron sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016233.6A CN106399629A (en) | 2016-11-18 | 2016-11-18 | Magnesium-rare earth alloy core-spun yarn and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016233.6A CN106399629A (en) | 2016-11-18 | 2016-11-18 | Magnesium-rare earth alloy core-spun yarn and preparation method thereof |
Publications (1)
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|---|---|
| CN106399629A true CN106399629A (en) | 2017-02-15 |
Family
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| CN201611016233.6A Withdrawn CN106399629A (en) | 2016-11-18 | 2016-11-18 | Magnesium-rare earth alloy core-spun yarn and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500821A (en) * | 2020-05-20 | 2020-08-07 | 李素坤 | Preparation method of steel for composite cored wire and high heat input welding |
-
2016
- 2016-11-18 CN CN201611016233.6A patent/CN106399629A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500821A (en) * | 2020-05-20 | 2020-08-07 | 李素坤 | Preparation method of steel for composite cored wire and high heat input welding |
| CN111500821B (en) * | 2020-05-20 | 2022-01-18 | 李素坤 | Preparation method of steel for composite cored wire and high heat input welding |
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Application publication date: 20170215 |
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