US20040103959A1 - Steel article - Google Patents

Steel article Download PDF

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Publication number
US20040103959A1
US20040103959A1 US10/473,230 US47323003A US2004103959A1 US 20040103959 A1 US20040103959 A1 US 20040103959A1 US 47323003 A US47323003 A US 47323003A US 2004103959 A1 US2004103959 A1 US 2004103959A1
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Prior art keywords
steel
article according
max
carbides
hardness
Prior art date
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Abandoned
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US10/473,230
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English (en)
Inventor
Odd Sandberg
Lennart Jonson
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Uddeholms AB
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Uddeholms AB
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Filing date
Publication date
Application filed by Uddeholms AB filed Critical Uddeholms AB
Priority claimed from PCT/SE2002/000714 external-priority patent/WO2002086177A1/en
Assigned to UDDEHOLM TOOLING AKTIEBOLAG reassignment UDDEHOLM TOOLING AKTIEBOLAG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JONSON, LENNART, SANDBERG, ODD
Publication of US20040103959A1 publication Critical patent/US20040103959A1/en
Priority to US11/441,085 priority Critical patent/US7563333B2/en
Abandoned legal-status Critical Current

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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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C22C38/22—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
    • C22C38/36—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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")

Definitions

  • the invention concerns a steel article having excellent wear resistance, good hardenability and tempering resistance, and adequate hardness and good toughness not only in the longitudinal direction of the steel material, i.e. in its working direction, but also in the transversal direction, and which also is favourable from a cost point of view; features which make the steel suitable to be used within several fields of application, including the following:
  • elements e.g. screws and barrels for feeding and conducting plastic masses in machines for the manufacturing of plastic components, e.g. elements in injecting moulding and extrusion assemblies,
  • wear parts e.g. details in pumps for feeding wearing media, as well as other wear parts in machines
  • knives with good toughness for disintegrating e.g., plastic materials and wood, comprising also chipper knives,
  • trimming tools for burring cast or pressed articles which may be hot or cold
  • the purpose of the invention to provide a steel article which satisfies the above mentioned demands.
  • the article is made of a spray-formed steel material having a chemical composition in weight-% and a micro-structure which is stated in the appending patent claims.
  • Carbon shall exist in a sufficient amount in the steel in order, in the hardened and tempered condition of the steel, to form 8 - 15 vol-%, preferably 10-14.5 vol-%, MC-carbides, where M substantially is vanadium, and also exist in solid solution in the martensitic matrix of the steel in the hardened condition of the steel in an amount of 0.1-0.5 weight-%, preferably 0.15-0.35 weight-%.
  • the content of the dissolved carbon in the matrix of the steel is about 0.25%.
  • the total amount of carbon in the steel i.e.
  • carbon that is dissolved in the matrix of the steel plus that carbon which is bound in the carbides shall be at least 1.2%, preferably at least 1.3%, while the maximal content of carbon may amount to 2.0%, preferably max 1.9%.
  • the carbon content is 1.4-1.8%, nominally 1.60-1.70%.
  • the article according to the invention is manufactured by a technique which comprises spray forming, in which drops of molten metal is sprayed against a rotating substrate on which the drops rapidly solidify in order to form a successively growing ingot.
  • the ingot subsequently can be hot worked by forging and/or rolling to desired shape.
  • the said carbides are formed at the solidification of the drops, and as the ingot is formed of the drops, the carbides are evenly distributed in the ingot and thence in the finished product.
  • the carbides Due to the controlled rate of solidification, which is slower than when metal powder is produced by atomising a stream of molten metal and rapid cooling of the formed drops, but essentially more rapid than in conventional ingot manufacturing, continuous casting and/or ESR-remelting, the carbides have sufficient time to grow to a size which has turned out to be very advantageous for the article of the invention.
  • the MC-carbides which consist of primary carbides which are difficult to dissolve, are caused to achieve an essentially rounded shape.
  • Individual carbides may be larger than 20 ⁇ m in the longest extension of the carbide, and many carbides may be smaller than 1 ⁇ m, but at least 80 vol-% of the MC-carbides get a size in the longest extension of the carbides amounting to 1-20 ⁇ m, preferably larger than 3 ⁇ m.
  • a typical size is 6-8 ⁇ m.
  • Nitrogen optionally may be added to the steel in connection with the spray forming in a maximal amount of 0.20%. According to the preferred embodiment of the invention, however, nitrogen is not intentionally added to the steel but nevertheless exists as an unavoidable element in an amount of max. 0.15%, normally max. 0.12%, and is at that level not any harmful ingredient. In the above mentioned volume content of MC-carbides, thus also a minor fraction of carbonitrides may be included.
  • Silicon is present as a residue from the manufacturing of the steel and normally exists in an amount of at least 0.1%, possibly at least 0.2%.
  • the silicon increases the carbon activity in steel and may therefore contribute to the achievement of an adequate hardness of the steel. If the content is higher, embrittlement problems may arise.
  • silicon is a strong ferrite former and must therefore not exist in amounts exceeding 1.5%.
  • the steel does not contain more than 1.0% silicon, suitably max. 0.65% silicon.
  • a nominal silicon content is 0.35%.
  • manganese is present as a residue from the manufacturing of the steel and binds those amounts of sulphur which may exist in low amounts in the steel by forming manganese sulphide.
  • Manganese therefore should exist in an amount of at least 0.1%, preferably in an amount of at least 0.2%.
  • Manganese also improves the hardenability, which is favourable, but must not be present in amounts exceeding 2.0% in order that embrittlement problems shall be avoided.
  • the steel does not contain more than max. 1.0% Mn.
  • a nominal manganese content is 0.5%.
  • Chromium shall exist in an amount of at least 4%, preferably in an amount of at least 4.2%, suitably at least 4.5%, in order to provide a desired hardenability to the steel.
  • the term hardenability means the capacity to provide a high hardness more or less deep in the article which is being hardened.
  • the hardenability shall be sufficient in order that the article shall be able to be through hardened even when the article has large dimensions, without the employment of very rapid cooling in oil or water at the hardening operation, which might cause dimension changes.
  • the working hardness i.e. the hardness of the steel after hardening and tempering, shall be 45-60 HRC.
  • Chromium is a strong ferrite former. In order to avoid ferrite in the steel after hardening from 980 to 1150° C., the chromium content must not exceed 8%, preferably max. 6.5%, suitably max. 5.5%.
  • a suitable chromium content is 5.0%.
  • Vanadium shall exist in the steel in an amount of 5.0-8.0% in order together with carbon and optionally nitrogen to form said MC-carbides or carbonitrides in the martensitic matrix of the steel in the hardened and tempered condition of the steel.
  • the steel contains at least 6.0 and max. 7.8% V.
  • a suitable vanadium content is 6.8-7.6%, nominally 7.3%.
  • vanadium may be replaced by niobium for the formation of MC-carbides, but for this twice as much niobium is required a compared with vanadium, which is a drawback
  • niobium has the effect that the carbides will get a more edgy shape and be larger that pure vanadium carbides, which may initiate ruptures or chippings and therefore reduce the thoughness of the material. This may be particularly serious in the steel of the invention, the composition of which has been optimised for the purpose of providing an excellent wear resistance in combination with a high hardness and tempering resistance, as far as the mechanical features of the material are concerned.
  • the steel therefore, according to an aspect of the invention, must not contain more than max 0.1% niobium, preferably max 0.04% niobium. Further, according to the same aspect of the invention, niobium may be tolerated only as an unavoidable impurity in the form of a residual element from the raw materials which are used in connection with the manufacturing of the steel.
  • the steel may contain niobium in an amount up to max. 1.0%, preferably max. 0.5%, suitably max. 0.3%. It can namely be assumed, that the harmful effect of niobium essentially can be inhibited by the high content of vanadium of the steel. This idea is based on the assumption that pure niobium carbides and/or carbonitrides hardly will appear in the steel.
  • niobium carbides and/or niobium carbonitrides may be formed initially in the steel, but it is believed that vanadium carbides and/or vanadium carbonitrides will be built to such an extent on such initially formed niobium carbides and/or niobium carbonitrides that the harmful effect which would be due to the more egdy shape of the pure niobium carbides and/or carbonitrides essentially is eliminated.
  • MC-carbides are formed in the form of mixed compounds of vanadium, niobium and carbon as well as corresponding mixed carbonitrides, wherefore in both cases the content of niobium is considered to be so small that, according to said variant of the invention, the negative roll of the niobium can be neglected.
  • Molybdenum shall exist in an amount of at least 0.5%, preferably at least 1.5%, in order to afford the steel a desired hardenability in combination with chromium and the limited amount of manganese.
  • molybdenum is a strong ferrite former. The steel therefore must not contain more than 3.5% Mo, preferably max. 2.8%. Nominally, the steel contains 2.3% Mo.
  • molybdenum may completely or partly be replaced by tungsten, but for this twice as much tungsten is required as compared with molybdenum, which is a drawback. Also the use of any produced scrap will become more difficult. Therefore tungsten should not exist in an amount of more than max. 1.0%, preferably max. 0.5'%. Most conveniently, the steel should not contain any intentionally added tungsten, which according to the most preferred embodiment of the invention is tolerated only as an unavoidable impurity in the form of a residue from the raw materials which are used in connection with the manufacturing of the steel.
  • the steel does not need, and should not, contain any more alloy elements in significant amounts. Some elements are definitely undesired, because they may have undesired influence on the features of the steel. This is true, e.g., as far as phosphorus is concerned, which should be kept at as low level as possible, preferably at max 0.03%, in order not to have an unfavourable effect on the toughness of the steel. Also sulphur in most respects is an undesired element, but its negative effect on, in the first place, the toughness, essentially can be neutralised by means of manganese, which forms essentially harmless manganese sulphides, wherefore sulphur may be tolerated in a maximal amount of 0.25%, preferably max. 0.15%, in order to improve the machinability of the steel. Normally the steel, however, does not contain more than max. 0.08%, preferably max. 0.03%, and most conveniently max. 0.02% S.
  • FIG. 1 is a photography which shows the micro-structure of a portion of an article according to the invention
  • FIG. 2 shows the micro-structure of a portion of an article of a reference steel at the same scale as FIG. 1,
  • FIG. 3 in the form of a bar chart shows the size distribution of carbides in a material according to the invention and in a reference material
  • FIG. 4 shows a number of tempering curves, which illustrate the influence of the austenitising and the tempering temperatures on the hardness of a steel according to the invention
  • FIG. 5 shows a number of tempering curves which illustrate the influence of the austenitising and tempering temperatures on the hardness of a steel according to the invention and of two examined reference materials
  • FIG. 6 shows CCT-diagrams, which illustrate the hardenability of a steel according to the invention and of a reference steel
  • FIG. 7 shows the influence of heat treatment and dimensions of the articles on the ductility of some examined materials
  • FIG. 8 in the form of a bar chart illustrates the abrasive wear resistances of a steel according to the invention and of a reference steel.
  • the material—the steel/the article—according to the invention may have the following nominal, chemical composition in weight-% according to a preferred embodiment: 1.60 C, 0.25 Si, 0.75 Mn, ⁇ 0.020 P, ⁇ 0.060 S, 5.00 Cr, 2.30 Mo, 7.30 V, ⁇ 0.005 Ni, ⁇ 0.005 Ti, ⁇ 0.30 Ni, ⁇ 0.25 Cu ⁇ 0.020 Al ⁇ 0.10 N balance iron and other impurities than the above mentioned.
  • the performed tests aim at evaluating a material which closely corresponds with the above nominal composition, by comparing the material with some known reference materials which represent closest prior art.
  • Steel No. 1 has a composition according to the invention.
  • This steel has been manufactured according to the so called spray forming technique, which also is known as the OSPRAY-method, according to which an ingot, which rotates about its longitudinal axis, successively is established from a molten material which in the form of drops which are sprayed against the growing end of the ingot that is produced continuously, the drops being caused to solidify comparatively rapidly once they have hit the substrate, however not as fast as when powder is produced and not as slow as in connection with conventional manufacturing of ingots or in connection with continuous casting.
  • spray forming technique which also is known as the OSPRAY-method
  • the spray-formed ingot of steel No. 1 had a mass of about 2380 kg.
  • the diameter of the ingot was about 500 mm.
  • the spray-formed ingot was heated to a forging temperature of 1100° C.-1150° C. and was forged to the shape of blanks having the final diamention ⁇ 330, 105, and 76.5 mm, respectively.
  • Table 1 gives the analyzed composition of the spray-formed ingot according to the invention, steel No. 1, and of the analyzed composition of a commercially available steel, steel No. 2.
  • Steel No. 3 is the nominal composition of the last mentioned steel according to the specification of the manufacturer.
  • Steel No. 4 states the composition of still another commercially available steel.
  • Steels No. 2, 3 and 4 are powder metallurgy manufactured steels. Besides the elements stated in Table 1, the steels only contain iron and other, unavoidable impurities than those which are stated in the Table.
  • FIG. 1 shows a scanning electron microscopical picture of the micro-structure of a rod having the dimension ⁇ 105 mm made of steel No. 1.
  • Primary carbides of MC-type could be observed in the spray-formed material, FIG. 1, where M substantially consists of vanadium.
  • the main part of the carbide volume thus represents carbide sizes between 2.0 and 10.0 ⁇ m and within that range there is a clear tendency that the carbides typically, i.e. the main part of the carbides with reference to volume, have a size between 3.0 and 7.5 ⁇ m.
  • the total carbide volume was determined by the manual point counting method in a scanning electron microscope to be 13.1 vol-% MC-carbides in steel No. 1 and to be 15.4 vol-% in steel No. 2, respectively. In steel No.
  • the micro-structure was of a type which is typical for powder metallurgy manufactured steels, which means that all carbides were very small, max. about 3 ⁇ m.
  • the great majority of the carbides had sizes within the range 0.5-2.0 ⁇ m and were evenly distributed in the matrix of the steel independent of the heat treatment. This can be observed visually by studying the micro photograph, FIG. 2, and is also evident from the bar chart in FIG. 3.
  • the bar chart shows that the great majority of the MC-carbides in steel No. 2 had sizes between 0.5 and 2.0 ⁇ m.
  • the blanks which were made of steel No. 1 had a hardness (Brinell hardness) of 190-230 HB, typically about 200-215 HB in the soft annealed condition, independent of the dimensions of the blanks.
  • the hardness of steel No. 2 was somewhat higher in the soft annealed condition; about 235 HB.
  • FIG. 5 illustrates the difference in response to tempering between steels No. 1 and No. 4.
  • the curve of steel No. 2 is based on only two points. The curves in the diagram show that steel No. 1 gives a higher hardness than at least steel No. 4 after hardening from essentially the same austenitising temperatures.
  • the tempering resistance of steel No. 1 also was better than that of steel No. 4.
  • the article made of steel No. 1 consisted of a blank with the dimension ⁇ 105 mm.
  • the impact energy was measured using un-notched test specimens after hardening from 1050° C./30 min+1150° C./10 min for steel No. 1 and varying tempering temperatures, and after hardening from 1060° C./60 min+540° C./2 ⁇ 2 h and 1180° C./10 min+550° C./2 ⁇ 2 h for steel No. 2 for varying rod dimensions of the two steels.
  • the test specimens were taken in the centre of the rods in the most critical direction, i.e. the transversal direction. The results are apparent from FIG. 7, which shows that the ductility is slightly reduced when the hardness is increased, but generally speaking the ductility of the two steels is equally good.
  • the impact energy at all measurements exceeded 10 J for all test specimens in the transversal direction, which satisfies the criteria of acceptable impact toughness as far as the intended fields of application of the article of the steel are concerned.
  • the article according to the invention may have any conceivable shape, including spray formed ingots, blanks in the form of, e.g., plates, bars, blocks, or the like, which normally are delivered by the steel manufacturer in the soft annealed condition with a hardness of 190-230 HB, typically about 200-215 HB to the customers for machining to final product shape, as well as the final product which has been hardened and tempered to intended hardness for the application in question.
  • the following heat treatments may be suitable:

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Coating By Spraying Or Casting (AREA)
US10/473,230 2001-04-25 2002-04-11 Steel article Abandoned US20040103959A1 (en)

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US11/441,085 US7563333B2 (en) 2001-04-25 2006-05-26 Process for producing steel article

Applications Claiming Priority (3)

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SE0101438-0 2001-04-25
SE0101438A SE518958C2 (sv) 2001-04-25 2001-04-25 Föremål av stål
PCT/SE2002/000714 WO2002086177A1 (en) 2001-04-25 2002-04-11 Steel article

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT500728B1 (de) * 2005-02-21 2006-03-15 Boehler Edelstahl Schneidwerkzeug
US20090180917A1 (en) * 2007-06-21 2009-07-16 Chih-Ching Hsieh High strength alloy
US20150013518A1 (en) * 2013-07-15 2015-01-15 Ford Global Technologies, Llc Composition And Tool For Cutting Metal Sheets
US20170016099A1 (en) * 2014-04-14 2017-01-19 Uddeholms Ab Cold work tool steel
CN114086070A (zh) * 2021-11-22 2022-02-25 河南科技大学 一种耐磨合金及其制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210262050A1 (en) * 2018-08-31 2021-08-26 Höganäs Ab (Publ) Modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221612A (en) * 1977-10-14 1980-09-09 Acieries Thome Cromback Grinding members
US5316596A (en) * 1991-09-12 1994-05-31 Kawasaki Steel Corporation Roll shell material and centrifugal cast composite roll
US5514065A (en) * 1993-03-31 1996-05-07 Hitachi Metals, Ltd. Wear- and seizing-resistant roll for hot rolling and method of making the roll
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
US6348109B1 (en) * 1998-03-23 2002-02-19 Uddeholm Tooling Aktiebolag Steel material and method for its manufacturing
US6511554B1 (en) * 2001-07-05 2003-01-28 Yutaka Kawano Stainless spheroidal carbide cast iron material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221612A (en) * 1977-10-14 1980-09-09 Acieries Thome Cromback Grinding members
US5316596A (en) * 1991-09-12 1994-05-31 Kawasaki Steel Corporation Roll shell material and centrifugal cast composite roll
US5514065A (en) * 1993-03-31 1996-05-07 Hitachi Metals, Ltd. Wear- and seizing-resistant roll for hot rolling and method of making the roll
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
US6348109B1 (en) * 1998-03-23 2002-02-19 Uddeholm Tooling Aktiebolag Steel material and method for its manufacturing
US6511554B1 (en) * 2001-07-05 2003-01-28 Yutaka Kawano Stainless spheroidal carbide cast iron material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT500728B1 (de) * 2005-02-21 2006-03-15 Boehler Edelstahl Schneidwerkzeug
US20090180917A1 (en) * 2007-06-21 2009-07-16 Chih-Ching Hsieh High strength alloy
US20150013518A1 (en) * 2013-07-15 2015-01-15 Ford Global Technologies, Llc Composition And Tool For Cutting Metal Sheets
US20170016099A1 (en) * 2014-04-14 2017-01-19 Uddeholms Ab Cold work tool steel
US10472704B2 (en) * 2014-04-14 2019-11-12 Uddeholms Ab Cold work tool steel
CN114086070A (zh) * 2021-11-22 2022-02-25 河南科技大学 一种耐磨合金及其制备方法

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SE0101438L (sv) 2002-10-26
SE0101438D0 (sv) 2001-04-25
SE518958C2 (sv) 2002-12-10
TW574382B (en) 2004-02-01

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