CN109182954A - A kind of plasma surfacing alloy powder and its preparation method and application - Google Patents
A kind of plasma surfacing alloy powder and its preparation method and application Download PDFInfo
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- CN109182954A CN109182954A CN201811356815.8A CN201811356815A CN109182954A CN 109182954 A CN109182954 A CN 109182954A CN 201811356815 A CN201811356815 A CN 201811356815A CN 109182954 A CN109182954 A CN 109182954A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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Abstract
The present invention relates to a kind of plasma surfacing alloy powders and its preparation method and application, belong to field of material technology.A kind of plasma surfacing alloy powder, including Fe base alloy powder and cast tungsten carbide powder.Fe base alloy powder includes: C 1~4%, Mo 1~4%, Ni 0.5~10%, Ti 0.1~0.5%, V 0.1~0.5%, Co 0.1~0.3%, Mn 0.1~0.3%, B 1~5%, Si 2~7%, Cr 10~40%, surplus Fe.Plasma surfacing wear resistant alloy powders of the invention are well combined with matrix, and hardness is high, and pore-free is mingled with inside built-up welding, smooth surface.Without obvious crackle shock resistance with higher, wear-resisting property is excellent.It can be widely applied to the wear-resisting intensive treatment of plasma surfacing of metal surface.
Description
Technical field
The present invention relates to field of material technology, and in particular to a kind of plasma surfacing alloy powder and preparation method thereof and
Using.
Background technique
With the development of the modernization of industry, the requirement to various equipment component surface propertys is higher and higher, such as abrasion,
The local damage on the surfaces such as burn into high-temperature oxydation often results in entire components failure again, eventually leads to equipment halt production, such as shield
Machine knife disk, coal pulverizer mill, concrete pump eye slab, many components such as cut ring ferrous metal surface, by bamboo wood chip, lime,
The lasting and violent mutual extrusion of the hard materials such as sandstone grain, iron filings, coal cinder, rubber-plastic particle, quartz mills, washes away etc.
Effect, leads to serious wear phenomenon, causes these components service lifes to greatly shorten, cause huge economic loss.
Tungsten carbide grain reinforced metal base composite material has high intensity, high rigidity, wear-resisting, corrosion-resistant, low thermal expansion system
The advantages that several, higher thermal conductivity, is widely used in the row such as mine, petroleum, geology, metallurgy, machinery, building materials, papermaking, power generation
Industry.Workpiece surface wearability can be significantly improved in workpiece surface heap postwelding, and then in petroleum geology probing, engineering machinery, water
The national economy key areas such as mud building materials and rail traffic plays an increasingly important role.In recent years in aerospace, automobile
And other structures material application field, tungsten carbide grain reinforced metal base composite material are considered as most promising function material
One of material.Plasma surfacing can prepare thicker layer because preparation method is simple, and high relative to other method deposition efficiencies,
It is at low cost, it is considered to be one of ideal surface reinforcing method.
Common plasma surfacing wear resistant alloy powders have nickel cobalt base and two kinds iron-based, and nickel cobalt base alloy powder such as Ni60 can
The performances such as wear-resistant are improved for component surface, due to China's nickel, cobalt raw material resource shortage and the factors limitations such as price is more expensive
Its use.Iron(-)base powder is cheap, but there is wear no resistance.Increase though having and adding carbide etc. in alloy powder
The strong technology for mutually improving wearability, but there is crack resistances it is poor, impact resistance is poor the disadvantages of.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention includes providing a kind of plasma surfacing alloy powder, the alloy
Powder has high-wearing feature, and crack resistance is good, shock proof performance.
The purpose of the present invention further includes the preparation method of above-mentioned plasma surfacing alloy powder, and this method is easy to operate, can
Control property is strong, it can be achieved that industrialized production.
The purpose of the present invention further includes providing above-mentioned plasma surfacing alloy powder in the wear-resisting intensive treatment of metal surface
In application.
The present invention solves its technical problem and adopts the following technical solutions to realize.
The present invention proposes a kind of plasma surfacing alloy powder, including Fe base alloy powder and cast tungsten carbide powder.
Fe base alloy powder includes: C 1~4%, Mo 1~4%, Ni 0.5~10%, Ti0.1~0.5%, and V 0.1~
0.5%, Co 0.1~0.3%, Mn 0.1~0.3%, B 1~5%, Si 2~7%, Cr 10~40%, surplus Fe.
A kind of preparation method of above-mentioned plasma surfacing alloy powder, comprising: by Fe base alloy powder and cast tungsten carbide
Powder mixing.
The invention proposes application of the above-mentioned plasma surfacing alloy powder in the wear-resisting intensive treatment of metal surface.
The beneficial effect comprise that
The present invention is added to Fe based alloy using Fe base alloy powder and cast tungsten carbide powder as raw material, by cast tungsten carbide
In powder, inhibit the dissolution of tungsten carbide by elements such as titanium vanadium in alloy powder, so that the wearing layer of this powder preparation has
Wearability is good, and crack resistance is good, while shock resistance with higher.The element that contains by adjusting Fe base alloy powder and its
Proportion improves the hardness of alloy powder, and then adjusts the hardness of overlay cladding, with cast tungsten carbide powder collective effect, improves heap
Layer wearability, crack resistance and shock resistance.Plasma surfacing wear resistant alloy powders of the invention are well combined with matrix,
Hardness is high, and pore-free is mingled with inside built-up welding, smooth surface.Without obvious crackle shock resistance with higher, wear-resisting property is excellent
It is different.It can be widely applied to the wear-resisting intensive treatment of plasma surfacing of metal surface.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
A kind of plasma surfacing alloy powder of the embodiment of the present invention and its preparation method and application is carried out below specific
Explanation.
The present invention provides a kind of plasma surfacing alloy powders, including Fe base alloy powder and cast tungsten carbide powder.
Cast tungsten carbide is added in Fe base alloy powder, inhibits the dissolution of tungsten carbide by elements such as titanium vanadium in alloy powder,
So that the wearing layer of this powder preparation has wearability good, crack resistance is good, while shock resistance with higher.Suitable casting
The wearability that tungsten carbide helps to improve overlay cladding is made, very few tungsten carbide improves limited, the excessive carbon of overlay cladding wear-resisting property
Changing tungsten will cause the cracking of overlay cladding by the experimental study of inventor, and the quality of cast tungsten carbide powder is Fe base alloy powder
Quality 1~20% when, obtained plasma surfacing alloy powder has preferable abrasion resistance and shock resistance.
Further, in the present invention preferably embodiment, Fe base alloy powder granularity is 45~150 microns, and shape is
It is subsphaeroidal.Cast tungsten carbide powder is irregular shape cast tungsten carbide or subsphaeroidal cast tungsten carbide, preferably spherical cast carbon
Change tungsten.Cast tungsten carbide powder in the embodiment of the present invention is tungsten carbide and ditungsten carbide (WC, W2C) eutectic structure, granularity
It is 38~420 microns.In the particle size range, Fe base alloy powder can preferably inhibit the dissolution of tungsten carbide.Optionally, Fe
Base alloy powder granularity is 50 microns, 60 microns, 75 microns, 85 microns, 90 microns, 95 microns, 100 microns, 110 microns, 115
Micron, 120 microns, 130 microns, 140 microns.The granularity of cast tungsten carbide powder can for 45 microns, 65 microns, 80 microns,
95 microns, 120 microns, 150 microns, 200 microns, 240 microns, 280 microns, 300 microns, 350 microns, 400 microns.
The element and its proportion that present inventor is contained by adjusting Fe base alloy powder, improve the hard of alloy powder
Degree, specifically, by weight percentage, Fe base alloy powder includes: C 1~4%, Mo 1~4%, Ni 0.5~10%, Ti
0.1~0.5%, V 0.1~0.5%, Co 0.1~0.3%, Mn 0.1~0.3%, B 1~5%, Si 2~7%, Cr 10
~40%, surplus Fe.
The addition of C contributes to form carbide reinforced phase, improves material built-up welding wearability, but the content of C should be in certain model
In enclosing, excessively high carbon content will be so that overlay cladding intensity declines.Further, the mass percent of C is 2~4%, wherein C's
Mass percent is 3%.
The addition of Mo can improve the high-temperature behavior and corrosion resistance of alloy.Further, the mass percent of Mo can for 2~
4%, wherein the mass percent of Mo can be 3%.
The addition of Ni and Cr can produce solution strengthening while improve the corrosion resistance of overlay cladding.Further, the quality hundred of Ni
Divide than being 3~7%, wherein the mass percent of Ni can be 4%, 5%, 6%.The mass percent of Cr is 20~30%,
In, the mass percent of Cr can be 23%, 24%, 25%, 26%, 28%.
The addition of Co and Cr also contributes to improving the performances such as alloy high-temp is anti-oxidant.The mass percent of Co be 0.1~
0.3%, wherein the mass percent of Co can be 0.2%.
The addition of B and Si can play fluxing fluxing effect, and can improve self-fluxing nature, increase the wet of hardfacing alloy and matrix
Property, reduce the defects of weld overlay cracking, stomata are mingled with.Further, the mass percent of B is 1~3%, wherein the quality of B
Percentage can be 2%.The mass percent that the mass percent of Si is 2~4%, B can be 3%.
Content by controlling Mn, Co, B, Si, C adjusts the hardness of overlay cladding, acts synergistically with cast tungsten carbide powder,
Tungsten carbide reinforced phase is formed, overlay cladding wearability is improved.
The present invention also provides the preparation methods of above-mentioned plasma surfacing alloy powder, comprising: by Fe base alloy powder and
The mixing of cast tungsten carbide powder.
Specifically, preparing Fe base alloy powder using gas atomization.According to the Fe base alloy powder chemical component to be prepared,
The scaling loss for considering melting atomization process, determines the ratio of the raw materials such as ferroalloy, nickel and chromium, raw material is put into smelting furnace with the short time
The laggard promoting the circulation of qi powder by atomization of melted alloyization will be atomized obtained powder and sieve.It should be noted that the embodiment of the present invention is adopted
Gas atomization is the general technology of the art.
After obtaining the Fe base alloy powder of certain particle size, pass through being mixed after Fe base alloy powder with cast tungsten carbide powder
Mechanical mixture is uniform.It can such as be mixed by blender, which is the general technology of this field, and the present invention does not do it
It limits.
Plasma surfacing alloy powder provided by the invention is suitable for plasma surfacing technique, and processing performance is good.Overlay cladding
Hardness number is greater than 60HRC, is well combined with matrix, and pore-free is mingled with inside built-up welding, and tungsten carbide particle is compared with smooth surface.Without obvious
Crackle shock resistance with higher, wear-resisting property are excellent.Plasma surfacing alloy powder can be widely applied to metal surface
The wear-resisting intensive treatment of plasma surfacing.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
A kind of plasma surfacing alloy powder is present embodiments provided, by weight percentage, comprising: Fe base alloy powder
With cast tungsten carbide powder, cast tungsten carbide powder content is the 5% of Fe base alloy powder quality.
The ingredient of Fe base alloy powder are as follows: C 1%, Mo 1%, Ni 0.5%, Ti 0.1%, V 0.5%, Co 0.1%,
Mn 0.1%, B 1%, Si 7%, Cr 20%, Fe 68.5%.
It uses gas atomization to prepare Fe base alloy powder: raw material being put into smelting furnace by said ratio, conjunction is melted with the short time
The laggard promoting the circulation of qi powder by atomization of aurification will be atomized obtained powder and sieve, and obtain the Fe based alloy that granularity is about 45~60 microns
Powder.It with granularity is about that 38~100 microns of mechanical mixtures are uniform by the Fe base alloy powder.
Embodiment 2
A kind of plasma surfacing alloy powder is present embodiments provided, by weight percentage, comprising: Fe base alloy powder
With cast tungsten carbide powder, cast tungsten carbide powder content is the 10% of Fe base alloy powder quality.
The ingredient of Fe base alloy powder are as follows: C 3%, Mo 3%, Ni 5%, Ti 0.2%, V 0.3%, Co 0.2%, Mn
0.2%, B 2%, Si 3%, Cr 25%, Fe 58%.
It uses gas atomization to prepare Fe base alloy powder: raw material being put into smelting furnace by said ratio, conjunction is melted with the short time
The laggard promoting the circulation of qi powder by atomization of aurification will be atomized obtained powder and sieve, and obtain the Fe based alloy that granularity is about 80~100 microns
Powder.It with granularity is about that 100~150 microns of mechanical mixtures are uniform by the Fe base alloy powder.
Embodiment 3
A kind of plasma surfacing alloy powder is present embodiments provided, by weight percentage, comprising: Fe base alloy powder
With cast tungsten carbide powder, cast tungsten carbide powder content is the 20% of Fe base alloy powder quality.
The ingredient of Fe base alloy powder are as follows: C 3.7%, Mo 4%, Ni 10%, Ti 0.5%, V 0.1%, Co
0.3%, Mn 0.3%, B 4.7%, Si 5.6%, Cr 38%, Fe 32.6%.
It uses gas atomization to prepare Fe base alloy powder: raw material being put into smelting furnace by said ratio, conjunction is melted with the short time
The laggard promoting the circulation of qi powder by atomization of aurification will be atomized obtained powder and sieve, and obtain the Fe base that granularity is about 100~120 microns and close
Bronze end.It with granularity is about that 200~300 microns of mechanical mixtures are uniform by the Fe base alloy powder.
Embodiment 4
A kind of plasma surfacing alloy powder is present embodiments provided, by weight percentage, comprising: Fe base alloy powder
With cast tungsten carbide powder, cast tungsten carbide powder content is the 1% of Fe base alloy powder quality.
The ingredient of Fe base alloy powder are as follows: C 4%, Mo 2.5%, Ni 4%, Ti 0.38%, V 0.3%, Co
0.2%, Mn 0.2%, B 2.5%, Si 3.5%, Cr 40%, Fe 43.2%.
It uses gas atomization to prepare Fe base alloy powder: raw material being put into smelting furnace by said ratio, conjunction is melted with the short time
The laggard promoting the circulation of qi powder by atomization of aurification will be atomized obtained powder and sieve, and obtain the Fe base that granularity is about 120~140 microns and close
Bronze end.It with granularity is about that 300~400 microns of mechanical mixtures are uniform by the Fe base alloy powder.
Embodiment 5
A kind of plasma surfacing alloy powder is present embodiments provided, by weight percentage, comprising: Fe base alloy powder
With cast tungsten carbide powder, cast tungsten carbide powder content is the 8% of Fe base alloy powder quality.
The ingredient of Fe base alloy powder are as follows: C 3.2%, Mo 2%, Ni 4%, Ti 0.4%, V 0.3%, Co 0.2%,
Mn 0.2%, B 2.5%, Si 3.5%, Cr 40%, Fe 43.2%.
It uses gas atomization to prepare Fe base alloy powder: raw material being put into smelting furnace by said ratio, conjunction is melted with the short time
The laggard promoting the circulation of qi powder by atomization of aurification will be atomized obtained powder and sieve, and obtain the Fe base that granularity is about 130~150 microns and close
Bronze end.It with granularity is about that 400~420 microns of mechanical mixtures are uniform by the Fe base alloy powder.
Comparative example 1
This comparative example provides Ni60.
Test example
It chooses the plasma surfacing alloy powder that Examples 1 to 5 provides and the Ni60 that comparative example 1 provides carries out room temperature hardness
Value and wear volume performance test, as a result such as following table.
1 the performance test results of table
As shown in Table 1, comparative example is compared, the alloy rigidity of plasma surfacing alloy powder provided by the invention is high, wear-resisting
Property is good.The wear-resisting reinforcing in metal surface of various working can be met.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of plasma surfacing alloy powder, which is characterized in that including Fe base alloy powder and cast tungsten carbide powder；
By mass percentage, the Fe base alloy powder includes: C 1~4%, Mo 1~4%, Ni 0.5~10%, Ti
0.1~0.5%, V 0.1~0.5%, Co 0.1~0.3%, Mn 0.1~0.3%, B 1~5%, Si 2~7%, Cr 10
~40%, surplus Fe.
2. plasma surfacing alloy powder according to claim 1, which is characterized in that by mass percentage, the Fe
Base alloy powder includes: the C 2~4%, the Mo 2~4%, the Ni 3~7%, the Ti 0.1~0.3%, institute
State V 0.2~0.4%, the Co 0.1~0.3%, the Mn 0.1~0.3%, the B 1~3%, the Si 2~
4%, the Cr 20~30%, the Fe of surplus.
3. plasma surfacing alloy powder according to claim 2, which is characterized in that by mass percentage, the Fe
Base alloy powder includes: the C 3%, the Mo 3%, the Ni 5%, the Ti 0.2%, the V 0.3%, described
Co 0.2%, the Mn 0.2%, the B 2%, the Si 3%, the Cr 25%, the Fe 58%.
4. plasma surfacing alloy powder according to claim 1, which is characterized in that the matter of the cast tungsten carbide powder
Amount is the 1~20% of the Fe base alloy powder quality.
5. plasma surfacing alloy powder according to claim 4, which is characterized in that the matter of the cast tungsten carbide powder
Amount is the 10~20% of the Fe base alloy powder quality.
6. plasma surfacing alloy powder according to claim 1, which is characterized in that the cast tungsten carbide powder is not
Regular shape or subsphaeroidal structure, the granularity of the cast tungsten carbide powder are 38~420 microns.
7. plasma surfacing alloy powder according to claim 1, which is characterized in that the granularity of the Fe base alloy powder
It is 45~150 microns.
8. a kind of preparation method of plasma surfacing alloy powder as described in any one of claim 1 to 7, which is characterized in that
It include: to mix the Fe base alloy powder and the cast tungsten carbide powder.
9. the preparation method of plasma surfacing alloy powder according to claim 8, which is characterized in that the Fe based alloy
Powder is prepared using gas atomization.
10. plasma surfacing alloy powder as described in any one of claim 1 to 7 is in the wear-resisting intensive treatment of metal surface
Application.
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Cited By (2)
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| CN112921236A (en) * | 2021-01-14 | 2021-06-08 | 上海欣冈贸易有限公司 | Metal composition for high-strength welding |
| CN113547192A (en) * | 2021-07-08 | 2021-10-26 | 自贡硬质合金有限责任公司 | Hard alloy wear-resistant block and preparation method thereof |
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| CN105297005A (en) * | 2015-10-22 | 2016-02-03 | 宁国市南方耐磨材料有限公司 | Method for preparing high-hardness and high-toughness abrasion resistant balls through laser cladding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112921236A (en) * | 2021-01-14 | 2021-06-08 | 上海欣冈贸易有限公司 | Metal composition for high-strength welding |
| CN113547192A (en) * | 2021-07-08 | 2021-10-26 | 自贡硬质合金有限责任公司 | Hard alloy wear-resistant block and preparation method thereof |
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Application publication date: 20190111 |