CN1492939A - Steel article - Google Patents

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Publication number
CN1492939A
CN1492939A CNA028053222A CN02805322A CN1492939A CN 1492939 A CN1492939 A CN 1492939A CN A028053222 A CNA028053222 A CN A028053222A CN 02805322 A CN02805322 A CN 02805322A CN 1492939 A CN1492939 A CN 1492939A
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Prior art keywords
steel
goods
feature
carbide
maximum
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Chinese (zh)
Inventor
奥德・桑德伯格
奥德·桑德伯格
・琼森
伦纳特·琼森
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UDDEHOLM TOOLING AG
Uddeholms AB
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UDDEHOLM TOOLING AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

A steel article consists of an alloy which contain in weight-%: 1.7 - 2.5 C; 0.1 - 2.0 Si; 0.1 - 2.0 Mn; max 0.2 N; max 0.2 S; 12 16 Cr; 2.1 - 3.5 (Mo + W/2); 5 - 8 V; max 0.1 Nb, balance essentially only iron and unavoidable impurities. The steel has a micro-structure obtainable by a manufacturing of the steel which comprises spray forming of an ingot, the micro-structure of which contains 14 -25 vol-% carbides of mainly MC-type, where M substantially consists of vanadium, of which carbides at least 80 vol-% have a substantially rounded shape and a size in the longest extension of the carbides amounting to 1 - 10 mu m, and M7C3-carbides, where M substantially consists of chromium, which carbides typically have a more elongated shape than the MC-carbides, of which MC-carbides at least 80 vol-% have a maximal extension amounting to 3-50 mu m.

Description

Steel work
Technical field
The invention relates to the steel work that has applicable to the steel manufacturing of the mold feature that steel requires of following any Application Areas.
Part for example is used for the screw rod and the cylindrical shell of feed and conducting plastic material in making the machine of plastic paste, as the parts of casting and compression assemblies and
The mould and the accessory that are used for the plastic material casting.
Especially the present invention is about having excellent abrasive resistance, good corrosion resistance, hardenability, and tempering resistance, and enough flexible steel bodies, and the feature that steel can be suitable in said Application Areas.Yet, application according to steel work of the present invention, not only be defined in described Application Areas, and can be used for other various types of application, here said feature is need or require, for example be used for carrying the pump component of wear medium and the worn parts of machine or other equipment, as mentioned those.
Technical background
For the parts in the above-mentioned Application Areas, still a kind of known in use so far, trade name is ELMAX TMSteel, it is a kind of heavy alloyed, the chromium-vanadium-molybdenum steel by powder metallurgy is made has good wear resistance and solidity to corrosion.This steel has following nominal chemical constitution, in weight %: 1.7C, and 0.8Ci, 0.3Mn, 18.0Cr, 1.0Mo, 3.0V, the iron of equal amount and impurity.This steel has high-wearing feature and solidity to corrosion, and this just makes it can make the mould with long service live that is used for plastic shaping.For example this steel can be used in the electronic industry, is used to make coupling part, contact element, resistance unit and unicircuit, but also can be used for foodstuffs industry, wherein because of the reason of health, requires solidity to corrosion, and simultaneously, wear resistance also is a principal element.
Yet, requiring to have excellent abrasive resistance, the hardenability of better combination, tempering resistance and corrosion proof steel are in the injection molding machine in particular for plastic material, such as parts such as the screw rod of feed and conducting plastic and cylindrical shells.
Disclosure of an invention
The purpose of this invention is to provide a kind of steel work that can satisfy above-mentioned requirements.This can reach, and this steel work can be by spraying the steel manufacturing form, this material have described in the claims in the chemical constitution of weight % and microstructural.
And then, have following purposes about the alloying element that contains in this steel.
Carbon is present in the steel with normal capacity, at the quenching and the annealing conditions of steel, combines formation 3-8vol%MC-carbide with vanadium, and wherein M is vanadium basically, combines with chromium, forms 10-20vol%M 7C 3-carbide, wherein M is chromium, MC-carbide and M basically 7C 3The total amount of-carbide adds up to 14-25vol%, and in the martensite matrix of the steel under curing condition, carbon is also with the solid solution form, and with 0.2-0.7 weight %, preferably the amount of 0.3-0.6 weight % exists.Suitable dissolved carbon amount is about 0.5% in the steel matrix.The total amount of carbon in the steel, that is, the carbon that is dissolved in the steel matrix adds with carbide bonded carbon, is 1.7% at least, is preferably 1.8%, the maximum level of carbon can reach 2.5%, preferably is not more than 2.3%.
Utilization comprises that the technology of reaction-injection moulding makes goods of the present invention, and wherein molten metal drips facing to the matrix of rotation and sprays, and drop solidifies rapidly on matrix, to form the ingot of continuous growth.Then with ingot, make and/or rolling being thermally processed into is desired shape by forging.When drop solidifies, form said carbide.This carbide is evenly distributed in the ingot, and is evenly distributed in the finished product thus.Because drop solidified control speed, be slower than by atomized molten metal flow and the rapid formed speed of dripping when making metal-powder of melting of cooling, but in fact will be faster than common ingot processing, continuous casting and/or the ESR-speed during fusion again, according to the present invention, carbide is the size that has time enough to grow into to be very beneficial for goods.Therefore, can make the MC-carbide obtain rounded basically shape, the MC-carbide of 80vol% reaches the carbide that the result is the longest extension of 1-10 μ m so at least, at least 5 μ m preferably, and M 7C 3The general acquisition of-carbide shape longer than MC-carbide, the MC-carbide of 80vol% has obtained maximum extension so at least, and its amount reaches 3-50 μ m, preferably at least 10 μ m.
In conjunction with reaction-injection moulding, but nitrogen randomly the Xiang Gangzhong maximum of adding be 0.20%.Yet according to the preferred embodiments of the invention, nitrogen does not have a mind to add in the steel, but still as inevitable element, the maximum with 0.15% exists, and is 0.12% usually to the maximum, yet it is not a kind of deleterious composition.On the contrary, nitrogen combines the carbonitride that forms vanadium and chromium with carbon, have good effect.Therefore, at the MC-and the M of above-mentioned volume content 7C 3The carbonitride that can comprise few share in the-carbide.
Silicon exists as the resistates of making from steel, and amount is at least 0.1% usually, and preferably at least 0.2%.Silicon can increase the activity of carbon in the steel, and therefore, silicon helps to make steel to have sufficient hardness, and can not produce the problem of embrittlement.Yet silicon is a very strong ferrite former, and therefore, amount can not surpass 2.0%, and preferably silicone content is not more than 1.0% in the steel.
Manganese also is to exist with the resistates of making from steel, and in conjunction with the sulphur of low levels, is present in the steel with the form that forms manganese sulfide.Therefore the amount of manganese is at least 0.1%, at least 0.2% amount preferably, and manganese also can promote hardenability, this is favourable, but amount can not surpass 2.0%, to avoid the problem of embrittlement, contains the Mn amount in the steel and preferably is not more than 1.0%, and specified manganese content is 0.5%.
The amount of chromium is at least 12%, and preferred amount is at least 13%, so that desired corrosion stability to be provided to steel.And then chromium is very important carbide former, forms the M7C3-carbide with carbon, and this carbide combines with the MC-carbide, can promote desired wear resistance, and chromium also can promote hardenability consumingly.The term hardenability means the ability of different depths place acquisition high rigidity in wanting the hardened goods.Even goods have sizable size, hardenability all is enough to the whole hardened goods of wanting, and needn't use cooling rapidly in oil or water in cure operations, and cooling might cause dimensional change fast.The hardness of steel is at least 55HRC after annealing, and that suitable is 58-64HRC.Yet chromium is a kind of very strong ferrite former.For fear of forming ferrite after the sclerosis down at 1020-1150 ℃, chromium content must be no more than 16%, preferably is 15.5% to the maximum.Suitable chromium content is 13.2-14.5%, is rated for 14.0%.
The amount of vanadium in steel normally is 5.0-8.0%, under sclerosis and annealing conditions, with carbon, perhaps with nitrogen, forms said MC-carbide or carbonitride in the martensite matrix of steel.The content at least 6.1% of vanadium in the steel preferably, maximum 7.5%.Suitable content of vanadium is 6.3-7.3%, is rated for 6.8%.
Say that in principle can replace vanadium with niobium for forming the CM-carbide, but for this reason, compare the duple niobium amount that needs with vanadium, this is a big shortcoming.Moreover niobium has a kind of effect, makes carbide form more clear-cut shape exactly, and bigger than pure vanadium carbide, and this phenomenon can cause fracture or peel off, and therefore reduces the toughness of material.This situation is particularly serious in steel of the present invention, with regard to the mechanical features of material, for the purpose of the excellent wear that obtains to combine with high rigidity and anti-tempering, select its best composition.Therefore, the content of niobium in the steel otherwise, preferably be 0.04% to the maximum greater than 0.1% of maximum.According to optimum implementation, niobium only can be with from making the relict element form of used related raw material with steel, exists as unavoidable impurities.
The amount of molybdenum is at least 2.1%, preferably is at least 2.3%, for steel being combined with the manganese of chromium and limited amount and having desired hardenability.Molybdenum also can promote the solidity to corrosion of steel, but it is a very strong ferrite former.Therefore, the content of molybdenum must be no more than 3.5% in the steel, preferably is 3.0% to the maximum, and optimum is maximum 2.5%.
In principle, molybdenum can replace with tungsten whole or in part, but, compares with molybdenum for this reason, needs 2 times tungsten amount, and this is a shortcoming.Use any smear metal also to become difficult more.Therefore the amount maximum of tungsten is no more than 1.0%, is preferably maximum 0.5%.Most convenient be, do not contain any tungsten that have a mind to add in the steel, according to optimum implementation of the present invention, tungsten can be since the relict element form of the used relevant raw material of self-control steel, exist as unavoidable impurities.
Except above-mentioned alloying element, do not need should not contain any alloying element of how obvious amount in the steel yet.Some element is clear and definite unwanted, because they cause undesirable influence to the characteristic of steel.This is certain, for example, with regard to phosphorus, should remain on minimum level as much as possible, preferably is 0.03% to the maximum, to prevent that the toughness of steel is caused bad influence.With regard to major part sulphur also is a kind of unwanted element, at first is that it causes negatively influencing to toughness, mainly is that it can be neutralized by manganese, and forms harmless manganese sulfide, and for improving the machinability of steel, allowing the maximum amount of sulphur is 0.2%.But preferably, the sulphur content maximum is no more than 0.1% in the steel usually, preferably is 0.05% to the maximum.
From the description of the following experiment of finishing and appended claim, will be more readily apparent from feature of the present invention and viewpoint.
The summary of accompanying drawing
In the following description of finishing experiment, with reference to the accompanying drawings, wherein
Fig. 1 is the microstructure photograph of expression part goods of the present invention,
Fig. 2 is the tempering curve of a plurality of detected Steel Alloys of expression,
Fig. 3 is the enlarged view of presentation graphs 2 middle part component curves,
Fig. 4 is with diagram shows steel of the present invention and 2 kinds of hardenabilitys with reference to material that have from the CCT-diagram data,
Fig. 5 be expression steel of the present invention and 2 kinds with reference to the wear resistance of material and
Fig. 6 is the polarization curve according to material, with corrosion current I CrThe solidity to corrosion of the detected material of formal specification.
Finish the description of test
Material
Listed the chemical constitution that is included in material in the test sequence in the table 1.Steel No.1 and 2 is reference materials.Two kinds all is powder metallurgy manufacturing.Steel No.1 is ELMAX TMThe industrial steel of type was mentioned in the technology of the present invention background is described, and steel No.2 is another kind of commercial available steel.Steel No.3A and No.4A are that target is formed, and steel No.3 and No.4 to be the analysis of 2 kinds of steel form, wherein the content of vanadium lays respectively at the low and higher part in the wide region of the chemical constitution of made goods steel according to the present invention.Steel No.3 and No.4 utilize so-called spray forming technology manufacturing, this technology is also referred to as the OSPRAY-method, according to this method, blank round its longitudinal axis rotation, is produced by the molten materials of drop form continuously, this drop sprays with respect to the growth end of quantity-produced blank, in a single day these drops strike matrix and can quite promptly solidify, yet and fast when producing powder, slow during also unlike relevant common manufacturing blank or relevant continuous casting.More specifically, cause that drop solidifies so rapidly, so that make the MC-and the M of formation 7C 3-carbide growth becomes size of the presently claimed invention.The steel No.3 of the blank of reaction-injection moulding and steel No.4 have about 2.9 and about 2.2 tons quality respectively.The diameter of blank is about 500mm.
The reaction-injection moulding blank heating of steel No.3 and steel No.4 is made 1100 ℃ of temperature to forging, and forge and cause the blank shape that is used for further detection.
Table 1 chemical constitution, weight-%
Steel, No. ??C ??Si ???Mn ????S ???Cr ???Mo ???V ???Nb ????N Balance
????1 1.71 0.84 ?0.30 0.019 ?17.9 ??1.08 ?3.01 ?0.015 0.104 Fe and unavoidable impurities
????2 2.41 0.29 ?0.43 0.019 ?13.1 ??1.12 ?7.91 ?0.003 0.083 ??-＂-
????3A * 1.85 0.50 ?0.40 ≤0.020 ?14.0 ??2.30 ?6.00 ?- ≤0.10 ??-＂-
????3 1.93 0.61 ?0.39 0.019 ?13.7 ??2.32 ?5.64 ?0.02 ?0.10 ??-＂-
????4A * 2.35 0.50 ?0.40 ≤0.020 ?14.4 ??2.30 ?8.20 ?- ≤0.10 ??-＂-
????4 ??-＂-
*The feeling the pulse with the finger-tip mark is formed
In the following research that will explain, to steel No.1,2 and 3 with reference to following the test
Microstructure
Form the influence of austenitizing and tempering temperature to hardness
Hardenability
Ductility
Wear resistance
Solidity to corrosion
Microstructure
Steel No, 1 and 2 microstructure is the steel that typical powder metallurgy is made, and it is all very little to mean all carbide, and maximum is about 3 μ m, is evenly distributed in the steel matrix, and is irrelevant with its thermal treatment.Be clear that from Fig. 1, steel No.3 at T AMicrostructure under back and the 525 ℃/2 * 2h tempered condition of hardening in=1120 ℃/30 minutes, the centre portions that demonstrates at test bar has cross section 350 * 63.5mm.In steel matrix, constitute by tempered martensite, mainly be to have typically round-shapedly, 1 μ m is to the MC-type carbide of the size of maximum 10 μ m and the M with the shape that more extends 7C 3The chromium carbide of type.In the center of rod, the size of chromium carbide is 15 * 50 μ m to the maximum.On the surface of rod, also detect, but do not show that in any picture MC-carbide and chromium carbide are a little littler, be about 6 μ m and 8 * 30 μ m at the most at the most respectively.The macro etch cross section of rod points out that significantly the structure in whole cross section is very smooth.
Detect carbide content by the some computing method in scanning electron microscope.The total content of the carbide among the steel No.3 of surveying is 20.4%, and wherein 15.4% is the (M that is rich in chromium 7C 3), the 5%th, be rich in (MC) of vanadium.With regard to steel No.2, the carbide total amount of being surveyed is 23.9vol%, and wherein 13.1% is (M7C3) that is rich in chromium, the 10.8%th, be rich in (MC) of vanadium.The carbide total amount of the steel No.1 that surveys is 14%, and wherein 13% is the (M that is rich in chromium 7C 3), the 1%th, be rich in (MC) of vanadium.All carbide contents all are meant vol-%.Heat-treat condition to steel No.2 and steel No.3, is T A=1120 ℃/30 minutes ,+250 ℃/2 * 2h,, be T to steel No.1 A=1050 ℃/30 minutes ,+250 ℃/2 * 2h.
Hardness after the thermal treatment
Under the soft annealing condition, steel of the present invention has the hardness (Brinell hardness) of 200-300HB, is generally 250HB.Illustrated among Fig. 2 after forming austenite between 1080-1150 ℃, tempering temperature is to the influence of hardness.Steel No.3 than 2 reference steel 1 and 2, presents the stronger sclerosis second time behind 1120 and 1150 ℃ of formation austenites, after 525 ℃/2 * 2h tempering, hardness reaches 63HRC.Show the A section that comprises tempering curve epirelief peak district with the amplification form among Fig. 3.Steel No.2 has identical hardness with steel No.1 behind 1120 ℃ of formation austenites, but in fact tempering resistance is lower than steel No.1 and No.3.
Hardenability
With curve form the relation of hardness to being cooled to 500 ℃ of required times from 800 ℃ is shown among Fig. 4.The hardenability that is clear that steel No.3 from this figure is better than steel No.1 significantly, and is more much better than steel No.2.
Toughness
Respectively to steel No.2 and No.3, by T A=1120 ℃/30 minutes and to steel No.1, by T AAfter hardening in=1100 ℃/30 minutes, after different tempering temperatures between 200～550 ℃, utilize the not specimen of otch, detect impact energy.Yet the rod iron size of detection changes, and therefore the result who obtains can not fully compare.Yet, the impact energy that can determine all detected steel to all vertically samples all surpass 10J, with regard to the impelling strength of approving, this has just satisfied the requirement that goods of the present invention are wanted Application Areas.
Abrasion
Utilize SiO 2Make abrasive,, detect wear resistance with the form of pin to pin (pin to pin) test.With regard to the size and stiffening temperature of detected sample, following getting final product on probation.Steel No.1:  38mm/T A=1100 ℃/30 minutes, steel No.2:  37mm/T A=1120 ℃/30 minutes, steel No.3:350 * 63.5mm/T A=1120 ℃/30 minutes.From the bar graph of Fig. 5, the result is very clear.This figure illustrates steel No.3, and all tempering temperatures are all presented best wear resistance.
Solidity to corrosion
By at 0.05M H 2SO 4, the potential curve in the pH=1.2 solution is measured solidity to corrosion.At the I that is defined as relevant place, corrosion proof active peak CT, this just means that corrosion current should be low as much as possible.In the bar graph of Fig. 6, different materials compares with the function of heat-treat condition.Steel No.3 has best solidity to corrosion after at least 400 ℃ tempering, after carrying out tempering under 525 ℃, the solidity to corrosion of all detected materials all reduces, and steel No.3 is a bit larger tham steel No.2, and significantly greater than steel No.1.Yet should see that comparatively speaking just this, after tempering, the hardness of steel No.3 is higher than comparative material basically.
Conclusion
Described test shows according to steel of the present invention can make the goods with very high wear resistance, and this is the result who combines because of with the hardness of steel, the carbide content that capacity is arranged and enough sizes.The hardenability that another important factor is a steel is very good, is better than comparative steel.Measuring with the good corrosion-resistant hardness that combines after 200 and 400 ℃ of following tempering is 59-62HRC, and after 500 ℃ of following tempering, hardness is 61-63HRC.525 ℃ of following tempering, obtain the hardness peak of 61-64HRC.Under latter event, can lose some solidity to corrosions, but high rigidity can be used for not existing in some application of excessive demand for solidity to corrosion.Therefore the present invention is by selecting suitable thermal treatment, and to various application, the application adaptability according to steel provides significant flexibility.Another important factor for the applicability of steel is its manufacturing, and this manufacturing is based on spray forming technology, and this technology is more more economical than powder metallurgy manufacturing.
It should further be appreciated that, article according to the invention can have any possible shape, the blank that comprises reaction-injection moulding, various forms of blanks such as plate, rod, piece for example, this blank is provided by steel manufacturers usually, has the hardness of 200-300HB under the soft annealing condition, the general 250HB that is about, be used for machining and become final shape of product for client, and final product, these products are hardened and are tempered to the hardness that above-mentioned application is scheduled to.

Claims (23)

1. steel work, feature is, contain the following alloy of forming in weight % and form 1.7-2.5C, 0.1-2.0Si, 0.1-2.0Mn, maximum 0.2N, maximum 0.2S, 12-16Cr, 2.1-3.5 (Mo+W/2), 5-8V, maximum 0.1Nb by a kind of, basically only with iron balance and unavoidable impurities, this steel has microstructure, and it is to make by the steel of reaction-injection moulding blank to obtain.The microstructure of this blank contains the MC-type that the is mainly carbide of 14-25vol%, and wherein M mainly is made up of vanadium, and wherein this carbide of 80vol% has the size that rounded basically shape and the longest extension of carbide reach 1-10 μ m at least, and M 7C 3-carbide, wherein M mainly is made up of chromium, this carbide has the shape longer than MC-carbide usually, wherein the MC-carbide at least 80vol% have the maximum that reaches 3-50 μ m and extend.
2. according to the goods of claim 1, feature is that microstructure contains the MC-carbide of 3-8vol% and the M of 10-20vol% 7C 3-carbide.
3. according to the goods of claim 2, feature is after sclerosis and tempering, to have the hardness of 55-64HRC.
4. according to the goods of claim 3, feature is after sclerosis and tempering, with the solid solution form, to contain the C of 0.2-0.7 weight % in the martensite matrix of steel.
5. according to each goods among the claim 1-4, feature is that the total amount of C is at least 1.8% in the steel.
6. according to each goods among the claim 1-4, feature is that the total amount of C is 2.3% to the maximum in the steel.
7. according to each goods among the claim 1-6, feature is that steel contains the Si of 0.2-1.0%.
8. according to each goods among the claim 1-7, feature is that steel contains the Mn of 0.2-1.0%.
9. according to each goods among the claim 1-8, feature is, steel contains and is at least 13% Cr.
10. according to each goods among the claim 1-9, feature is that steel contains and is 15.5% Cr to the maximum.
11. according to the goods of claim 10, feature is that steel contains the Cr of 13.2-14.5%.
12. according to the goods of claim 1-10, feature is, steel contains and is at least 6.1%V.
13. according to the goods of claim 1-11, feature is that steel contains and is 7.5% V to the maximum.
14. according to the goods of claim 12 and 14, feature is that steel contains the V of 6.3-7.3%.
15. according to each goods among the claim 12-14, feature is that steel does not contain the Nb greater than 0.04.
16. according to each goods among the claim 1-15, feature is that steel contains at least 2.3% Mo.
17. according to each goods among the claim 1-15, feature is that steel contains and is 3.0% Mo to the maximum.
18. according to each goods among the claim 1-17, feature is that steel does not contain the W greater than maximum 1.0%, preferably is 0.5% W to the maximum.
19. according to each goods among the claim 1-18, feature is that steel does not contain the S greater than maximum 0.1%, preferably is 0.05% S to the maximum.
20. according to each goods among the claim 3-19, feature is, under 180-220 ℃ after sclerosis and tempering, have the hardness of 55-62HRC, preferably be at least 59HRC.
21. according to each goods among the claim 3-19, feature is, under 380-450 ℃ after sclerosis and tempering, have the hardness of 55-62HRC, preferably be at least 59HRC.
22. according to each goods among the claim 3-19, feature is after hardening under the temperature between 480-520 ℃, to have the hardness of 60-63HRC.
23. according to each goods among the claim 3-19, feature is after hardening under the temperature between 510-530 ℃, to have the hardness of 61-64HRC.
CNA028053222A 2001-03-06 2002-03-05 Steel article Pending CN1492939A (en)

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CN109295382A (en) * 2018-10-22 2019-02-01 河南科技大学 A kind of high nitrogen antifriction anticorrosion alloy and preparation method thereof

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SE521150C2 (en) * 2002-02-15 2003-10-07 Uddeholm Tooling Ab Steel material containing carbides and use of this material
JP4999328B2 (en) * 2003-07-31 2012-08-15 株式会社小松製作所 Sintered sliding member
JP5122068B2 (en) 2004-04-22 2013-01-16 株式会社小松製作所 Fe-based wear-resistant sliding material
AT501794B1 (en) * 2005-04-26 2008-06-15 Boehler Edelstahl PLASTIC FORM
US20060249230A1 (en) * 2005-05-09 2006-11-09 Crucible Materials Corp. Corrosion and wear resistant alloy
SE528991C2 (en) 2005-08-24 2007-04-03 Uddeholm Tooling Ab Steel alloy and tools or components made of the steel alloy

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FR2405749A1 (en) * 1977-10-14 1979-05-11 Thome Cromback Acieries NEW FORGED CRUSHING BODIES, ESPECIALLY CRUSHING BALLS, AND THEIR MANUFACTURING PROCESS
FR2690166A1 (en) * 1992-04-16 1993-10-22 Creusot Loire A method of manufacturing a plated sheet having an abrasion-resistant layer of tool steel and plated sheet obtained.
US5679908A (en) * 1995-11-08 1997-10-21 Crucible Materials Corporation Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and a method for producing the same
US5900560A (en) * 1995-11-08 1999-05-04 Crucible Materials Corporation Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and method for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109295382A (en) * 2018-10-22 2019-02-01 河南科技大学 A kind of high nitrogen antifriction anticorrosion alloy and preparation method thereof
CN109295382B (en) * 2018-10-22 2020-01-24 河南科技大学 High-nitrogen wear-resistant corrosion-resistant alloy and preparation method thereof

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EP1366204A1 (en) 2003-12-03
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WO2002070769A8 (en) 2004-06-03
WO2002070769A1 (en) 2002-09-12
US20040094239A1 (en) 2004-05-20
JP2004523656A (en) 2004-08-05
SE0100737D0 (en) 2001-03-06
SE518678C2 (en) 2002-11-05
SE0100737L (en) 2002-09-07
CA2436423A1 (en) 2002-09-12

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