EP2873748B1 - Wear-resistant steel plate having excellent low-temperature toughness and corrosion wear resistance - Google Patents

Wear-resistant steel plate having excellent low-temperature toughness and corrosion wear resistance Download PDF

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Publication number
EP2873748B1
EP2873748B1 EP13839513.2A EP13839513A EP2873748B1 EP 2873748 B1 EP2873748 B1 EP 2873748B1 EP 13839513 A EP13839513 A EP 13839513A EP 2873748 B1 EP2873748 B1 EP 2873748B1
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Prior art keywords
steel plate
cooled
content
water
steel
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German (de)
English (en)
French (fr)
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EP2873748A1 (en
EP2873748A4 (en
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Shinichi Miura
Keiji Ueda
Nobuyuki Ishikawa
Naoki Takayama
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JFE Steel Corp
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JFE Steel Corp
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
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    • 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
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    • C21D6/00—Heat treatment of ferrous alloys
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    • C21D6/00—Heat treatment of ferrous alloys
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    • C21D6/00—Heat treatment of ferrous alloys
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    • C21D6/00—Heat treatment of ferrous alloys
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling

Definitions

  • the present invention relates to an abrasion resistant steel plate suitably used for parts of industrial machines, transporting machines and the like.
  • the abrasion resistant steel plate according to the present invention has excellent low temperature toughness and can be suitably used as parts which are used in places where wear or abrasion generated due to a contact of the abrasion resistant steel plate with earth and sand containing water must be particularly taken into consideration.
  • abrasion is generated due to a contact of the part with earth, sand or the like.
  • a steel material having excellent abrasion resistance is used for extending lifetime of the parts.
  • various states such as a dry state or a wet state are considered as a state of earth, sand or the like.
  • patent literature 1 proposes a method of manufacturing a high-hardness abrasion resistant steel having excellent low-temperature toughness, wherein hot rolling is applied to a steel slab having the composition containing by mass%: 0.30% to 0.50% C, proper amounts of Si, Mn, Al, N, Ti, Nb and B respectively, and 0.10% to 0.50% Cr and 0.05% to 1.00% Mo, thereafter, quenching treatment is applied to the hot rolled plate from a temperature of Ar 3 transformation point or above and, subsequently, the quenched plate is tempered thus obtaining high-strength abrasion resistant steel.
  • the improvement of hardenability of the steel and the improvement of low-temperature toughness through strengthening of grain boundaries are achieved by allowing the steel to contain a large amount of Cr and a large amount of Mo. Further, according to the description of the technique described in patent literature 1, the further enhancement of low-temperature toughness is achieved by applying tempering treatment to the steel.
  • Patent literature 2 proposes a high toughness abrasion resistant steel plate which has the composition containing by mass%: 0.18% to 0.25% C, 0.10% to 0.30% Si, 0.03% to 0.10% Mn, proper amounts of Nb, Al, N and B respectively, 1.00% to 2.00% Cr, and Mo more than 0.50% to 0.80%, and exhibits excellent toughness and excellent delayed fracture resistance after water quenching and tempering.
  • Patent literature 3 proposes a high toughness and abrasion resistant steel which has the composition containing by mass%: 0.30% to 0.45% C, 0.10% to 0.50% Si, 0.30% to 1.20% Mn, 0.50% to 1.40% Cr, 0.15% to 0.55% Mo, 0.0005% to 0.0050% B, 0.015% to 0.060% sol. Al, and proper amounts of Nb and/or Ti.
  • the steel contains a large amount of Cr and a large amount of Mo and hence, hardenability of the steel is enhanced and, at the same time, grain boundaries are strengthened thus enhancing low-temperature toughness.
  • Patent literature 4 proposes a method of manufacturing an abrasion resistant steel, wherein hot-rolling is applied to steel having the composition containing by mass% : 0.05% to 0.40% C, 0.1% to 2.0% Cr, further, proper amounts of Si, Mn, Ti, B, Al and N respectively and, further, Cu, Ni, Mo, and V as arbitrary components at a cumulative reduction ratio of 50% or more in an austenitic non-recrystallized temperature range at a temperature of 900°C or below, thereafter, quenching is applied to a hot-rolled plate from a temperature of Ar 3 transformation point or above and, subsequently, the quenched plate is tempered, thus abrasion resistant steel being obtained.
  • directly quenching and tempering elongated austenite grains result the tempered martensitic structure where prior austenite grains are elongated.
  • the tempered martensitic structure of the elongated grains remarkably enhances low-temperature toughness.
  • patent literature 5 proposes an abrasion resistant steel plate having excellent low-temperature toughness and having the composition containing by mass%: 0.10% to 0.30% C, 0.05% to 1.0% Si, 0.1% to 2.0% Mn, 0.10% to 1.40% W, 0.0003% to 0.0020% B, 0.005% to 0.10% Ti and/or 0.035% to 0.1% Al.
  • the abrasion resistant steel plate may further contain one or more kinds of elements selected from a group consisting of Cu, Ni, Cr and V. Due to such composition, it is considered that the abrasion resistant steel plate has high surface hardness and exhibits excellent abrasion resistance and excellent low-temperature toughness.
  • patent literature 6 an abrasion resistant steel plate having excellent bending property is described.
  • the technique described in patent literature 6 is related to an abrasion resistant steel plate having the composition containing by mass%: 0.05% to 0.30% C, 0.1% to 1.2% Ti, and not more than 0.03% solute C, and having the structure wherein a matrix is formed of a ferrite phase and a hard phase is dispersed in the matrix.
  • the abrasion resistant steel plate described in patent literature 6 may further contain one or two kinds of components selected from a group consisting of Nb and V, one or two kinds of components selected from a group consisting of Mo and W, one or two kinds of components selected from a group consisting of Si, Mn and Cu, one or two kinds of components selected from a group consisting of Ni and B, and Cr. Due to such composition, regarding the abrasion resistant steel plate described in patent literature 6, it is considered that both abrasion resistance against abrasion caused by earth and sand and bending property can be enhanced without inducing remarkable increase of hardness.
  • Patent Literature 7 describes a wear resistant steel sheet which is excellent in low temperature toughness and low temperature tempering brittle crack resistance.
  • Patent Literature 8 describes a wear resistant steel sheet which is excellent in low temperature tempering brittle crack resistance.
  • the present invention has been made to overcome the above-mentioned drawbacks of the related art, and it is an object of the present invention to provide an abrasion resistant steel plate which can be manufactured at a low cost, possesses excellent abrasion resistance, and has both of excellent low-temperature toughness and excellent corrosive wear resistance.
  • the inventors also have found that abrasion resistance and corrosive wear resistance against abrasion caused by earth and sand can be remarkably enhanced by maintaining surface hardness of the steel plate at a high level provided that the steel plate has the above-mentioned composition.
  • the inventors also have found that the excellent low-temperature toughness of the steel plate can be surely acquired while the excellent abrasion resistance being assured by allowing the steel plate to contain proper amounts of Cr and Mo as indispensable components and to contain proper amounts of at least C, Si, Mn, P, S, Al, Cr, Mo in a state where DI* defined by the following formula (1) is satisfied 45 or more to enhance hardenability of the steel plate, then by making the structure where an as-quenched martensitic phase forms a main phase with ensuring surface hardness of 450 or more at Brinel hardness HBW 10/3000 and further by making the as-quenched martensitic phase finer so that a grain size of prior austenite ( ⁇ ) grains is 30 ⁇ m or less.
  • DI * 33.85 ⁇ 0.1 ⁇ C 0.5 ⁇ 0.7 ⁇ Si + 1 ⁇ 3.33 ⁇ Mn + 1 ⁇ 0.35 ⁇ Cu+1 ⁇ 0.36 ⁇ Ni + 1 ⁇ 2.16 ⁇ Cr + 1 ⁇ 3 ⁇ Mo + 1 ⁇ 1.75 ⁇ V + 1 (where, C, Si, Mn, Cu, Ni, Cr, Mo and V denote the contents (mass%) of respective elements)
  • the present invention has been made based on the above-mentioned findings and has been completed after further study of the findings. That is, the gist of the invention is as follows.
  • an abrasion resistant steel plate having especially excellent corrosive wear resistance in an earth-and-sand abrasion environment in a wet state, having excellent low temperature toughness, and excellent abrasion resistance in a stable manner without lowering surface hardness.
  • C is an element for increasing hardness of the steel plate and for enhancing abrasive resistance.
  • the content of C is less than 0.23%, the steel plate cannot acquire sufficient hardness .
  • the content of C exceeds 0.35%, weldability, low-temperature toughness and workability of the steel plate are lowered. Accordingly, the content of C is limited to a value which falls within a range from 0.23% to 0.35%.
  • the content of C is preferably limited to a value which falls within a range from 0.25% to 0.30%.
  • Si is an effective element acting as a deoxidizing agent for molten steel. Si is also an element which contributes to the enhancement of strength of the steel plate by increasing solid solution strengthening.
  • the content of Si is set to 0.05% or more to ensure such effects. When the content of Si is less than 0.05%, a deoxidizing effect cannot be sufficiently acquired. On the other hand, when the content of Si exceeds 1.00%, ductility and toughness of the steel plate are lowered, and the content of inclusions in the steel plate is increased. Accordingly, the content of Si is limited to a value which falls within a range from 0.05% to 1.00%.
  • the content of Si is preferably limited to a value which falls within a range from 0.15% to 0.45%.
  • Mn is an element having an action of enhancing hardenability. To ensure such an effect, the content of Mn is set to 0.1% or more. On the other hand, when the content of Mn exceeds 2.0%, temper embrittlement is occurred and weld heat-affected zone become hardened, weldability being lowered. Accordingly, the content of Mn is limited to a value which falls within a range from 0.1% to 2.0%. The content of Mn is preferably limited to a value which falls within a range from 0.4% to 1.7%. It is more preferable that the content of Mn is limited to a value which falls within a range from 0.5% to 1.0%.
  • the content of P in steel When the content of P in steel is large, lowering of low-temperature toughness of the steel plate is induced and hence, it is desirable that the content of P be as small as possible.
  • the permissible content of P is 0.020%.
  • the excessive reduction of the content of P induces the sharp rise in a refining cost. Accordingly, the content of P is 0.005% or more.
  • the permissible content of S is 0.005%. Accordingly, the content of S is limited to 0.005% or less. The excessive reduction of the content of S induces the sharp rise of a refining cost. Accordingly, the content of S is 0.0005% or more.
  • Al is an element acting as a deoxidizing agent for molten steel. Further, Al contributes for the enhancement of low-temperature toughness due to refining of crystal grains. To acquire such an effect, the content of Al is set to 0.005% or more. When the content of Al is less than 0.005%, such an effect cannot be sufficiently acquired. On the other hand, when the content of Al exceeds 0.100%, weldability of the steel plate is lowered. Accordingly, the content of Al is limited to a value which falls within a range from 0.005% to 0.100%. The content of Al is preferably limited to a value which falls within a range from 0.015% to 0.050%.
  • Cr has an effect of increasing hardenability. Cr has also an effect of enhancing low-temperature toughness due to refining of a martensitic phase. Accordingly, in the present invention, Cr is an important element. Further, in a corrosive wear environment where a contact between a steel plate and earth and sand or the like in a wet state becomes a problem, Cr is dissolved as chromate ion due to an anodic reaction, and suppresses corrosion due to an inhibitor effect thus giving rise to an effect of enhancing corrosive wear resistance of the steel plate. To acquire such an effect, the content of Cr is set to 0.03% or more. When the content of Cr is less than 0.03%, the steel plate cannot exhibit such an effect sufficiently.
  • the content of Cr exceeds 2.0%, weldability is lowered and a manufacturing cost is sharply increased. Accordingly, the content of Cr is limited to a value which falls within a range from 0.03% to 2.0%.
  • the content of Cr is preferably limited to a value which falls within a range from 0.07% to 1.0%. It is more preferable that the content of Cr is limited to a value which falls within a range from 0.2% to 0.9%.
  • Mo has an effect of increasing hardenability. Mo has also an effect of enhancing low-temperature toughness due to refining of a martensitic phase. Accordingly, in the present invention, Mo is an important element. Further, in a corrosive wear environment where a contact between a steel plate and earth and sand or the like in a wet state becomes a problem, Mo is dissolved as molybdate ion due to an anodic reaction, and suppresses corrosion by an inhibitor effect thus giving rise to an effect of enhancing corrosive wear resistance. To acquire such an effect, the content of Mo is set to 0.03% or more. When the content of Mo is less than 0.03%, the steel plate cannot exhibit such an effect sufficiently.
  • the content of Mo is limited to a value which falls within a range from 0.03% to 1.0%.
  • the content of Mo is preferably limited to a value which falls within a range from 0.10% to 0.50%. It is more preferable that the content of Mo is limited to a value which falls within a range from 0.20% to 0.40%.
  • One or two kinds of components selected from a group consisting of 0.005% to 0.2% Sn and 0.005% to 0.2% Sb.
  • Both Sn and Sb are elements which enhance corrosive wear resistance.
  • the abrasion resistant steel plate according to the present invention contains one or two kinds of elements selected from a group consisting of Sn and Sb.
  • Sn is dissolved as Sn ion due to an anodic reaction, and suppresses corrosion by an inhibiter effect thus enhancing corrosive wear resistance of a steel plate. Further, Sn forms an oxide film containing Sn on a surface of the steel plate and hence, an anodic reaction and a cathode reaction of the steel plate are suppressed whereby corrosive wear resistance of the steel plate is enhanced.
  • the content of Sn is set to 0.005% or more for acquiring such an effect. On the other hand, when the content of Sn exceeds 0.2%, the deterioration of ductility and toughness of the steel plate may be induced.
  • the content of Sn is limited to a value which falls within a range from 0.005% to 0.2%.
  • the content of Sn is preferably set to a value which falls within a range from 0.005% to 0.1% from a view point of reducing tramp elements.
  • Sb suppresses corrosion of a steel plate by suppressing an anodic reaction of the steel plate and also by suppressing a hydrogen generation reaction which is a cathode reaction thus enhancing corrosive wear resistance of the steel plate.
  • the content of Sb is set to 0.005% or more for sufficiently acquiring such an effect.
  • the content of Sb exceeds 0.2%, the deterioration of toughness of the steel plate may be induced. Accordingly, when the steel contains Sb, the content of Sb is set to a value which falls within a range from 0.005% to 0.2%. It is preferable that the content of Sb is set to a value which falls within a range from 0.005% to 0.1%.
  • the above-mentioned components are the basic components of the steel.
  • the abrasion resistant steel plate according to the present invention further may optionally contain, in addition to the above-mentioned basic components, as an optional element or optional elements, one or two or more kinds of components selected from a group consisting of 0.005% to 0.1% Nb, 0.005% to 0.1% Ti, and 0.005% to 0.1% V, and/or one or two or more kinds of components selected from a group consisting of 0.03% to 1.0% Cu, 0.03% to 2.0% Ni, and 0.0003% to 0.0030% B, and/or one or two or more kinds of components selected from a group consisting of 0.0005% to 0.008% REM, 0.0005% to 0.005% Ca, and 0.0005% to 0.005% Mg.
  • One or two or more kinds of components selected from a group consisting of 0.005% to 0.1% Nb, 0.005% to 0.1% Ti, and 0.005% to 0.1% V
  • the abrasion resistant steel plate according to the present invention when necessary, contains one or two or more kinds of components selected from a group consisting of Nb, Ti and V.
  • Nb is an element which precipitates as carbonitride and contributes to the enhancement of toughness through refining of the structure.
  • the content of Nb may be set to 0.005% or more for obtaining such an effect.
  • the content of Nb exceeds 0.1%, weldability may be lowered.
  • the content of Nb is preferably limited to a value which falls within a range from 0.005% to 0.1%.
  • the content of Nb is more preferably set to a value which falls within a range from 0.012% to 0.03% from a view point of refining of the structure.
  • Ti is an element which precipitates as TiN and contributes to the enhancement of toughness through fixing solid solute N.
  • the content of Ti is set to 0.005% or more for acquiring such an effect.
  • the content of Ti exceeds 0.1%, coarse carbonitride precipitates so that toughness is lowered in some cases.
  • the content of Ti is preferably limited to a value which falls within a range from 0.005% to 0.1%.
  • the content of Ti is preferably limited to a value which falls within a range from 0.005% to 0.03% from a view point of the reduction of a manufacturing cost.
  • V is an element which precipitates as carbonitride and contributes to the enhancement of toughness through an effect of refining the structure.
  • the content of V is set to 0.005% or more for acquiring such an effect.
  • the content of V exceeds 0.1%, weldability is lowered in some cases. Accordingly, when the steel contains V, the content of V is preferably limited to a value which falls within a range from 0.005% to 0.1%.
  • One or two or more kinds of components selected from a group consisting of 0.03% to 1.0% Cu, 0.03% to 2.0% Ni, and 0.0003% to 0.0030% B
  • the abrasion resistant steel plate according to the present invention when necessary, may contain one or two or more kinds of elements selected from a group consisting of Cu, Ni and B.
  • Cu is an element which contributes to the enhancement of hardenability.
  • the content of Cu may be 0.03% or more for acquiring such an effect.
  • the content of Cu exceeds 1.0%, hot workability is lowered, and a manufacturing cost also sharply rises.
  • the content of Cu is preferably limited to a value which falls within a range from 0.03% to 1.0%.
  • the content of Cu is more preferably limited to a value which falls within a range from 0.03% to 0.5% from a view point of further reduction of a manufacturing cost.
  • Ni is an element which contributes also to the enhancement of hardenability and the enhancement of low-temperature toughness of the steel plate.
  • the content of Ni may be 0.03% or more for acquiring such an effect.
  • the content of Ni exceeds 2.0%, a manufacturing cost may rise.
  • the content of Ni is preferably limited to a value which falls within a range from 0.03% to 2.0%.
  • the content of Ni is more preferably limited to a value which falls within a range from 0.03% to 0.5% from a viewpoint of further reduction of a manufacturing cost.
  • B is an element which contributes to the enhancement of hardenability with a small amount in steel.
  • the content of B may be 0.0003% or more for acquiring such an effect.
  • toughness of the steel plate may be lowered.
  • the content of B is preferably limited to a value which falls within a range from 0.0003% to 0.0030%.
  • the content of B more preferably falls within a range from 0.0003% to 0.0015% from a viewpoint of suppressing cold cracking at a welded part formed by low-heat input welding such as CO 2 welding or the like used in general in welding of an abrasion resistant steel plate.
  • One or two or more kinds of components selected from a group consisting of 0.0005% to 0.008% REM, 0.0005% to 0.005% Ca, and 0.0005% to 0.005% Mg
  • All of REM, Ca and Mg are elements which form sulfide inclusions by combining with S and hence, these elements are elements which suppress the formation of MnS.
  • the abrasion resistant steel plate according to the present invention when necessary, contains one or two or more kinds of components selected from a group consisting of REM, Ca and Mg.
  • the content of REM may be 0.0005% or more for acquiring such an effect.
  • the content of REM exceeds 0.008%, the contents of inclusions in the steel plate are increased so that toughness is lowered in some cases.
  • the content of REM is preferably limited to a value which falls within a range from 0.0005% to 0.008%.
  • the content of REM is more preferably set to a value which falls within a range from 0.0005% to 0.0020%.
  • Ca fixes S thus suppressing the formation of MnS which causes lowering of toughness.
  • the content of Ca may be 0.0005% or more for acquiring such an effect.
  • the content of Ca exceeds 0.005%, the content of inclusions in the steel is increased and toughness may be lowered to the contrary.
  • the content of Ca is preferably limited to a value which falls within a range from 0.0005% to 0.005%.
  • the content of Ca is more preferably set to a value which falls within a range from 0.0005% to 0.0030%.
  • Mg fixes S thus suppressing the formation of MnS which causes lowering of toughness of the steel plate.
  • the content of Mg may preferably be 0.0005% or more for acquiring such an effect.
  • the content of Mg exceeds 0.005%, the content of inclusions in the steel plate is increased and toughness may be lowered to the contrary.
  • the content of Mg is preferably limited to a value which falls within a range from 0.0005% to 0.005%. It is more preferable that the content of Mg is set to a value which falls within a range from 0.0005% to 0.0040%.
  • the abrasion resistant steel plate according to the present invention has the above-mentioned components within the above-mentioned rages and in a state where DI* is satisfied 45 or more.
  • DI* is defined by the following formula (1).
  • elements not contained in the steel are calculated as Zero.
  • DI * 33.85 ⁇ 0.1 ⁇ C 0.5 ⁇ 0.7 ⁇ Si + 1 ⁇ 3.33 ⁇ Mn + 1 ⁇ 0.35 ⁇ Cu+1 ⁇ 0.36 ⁇ Ni + 1 ⁇ 2.16 ⁇ Cr + 1 ⁇ 3 ⁇ Mo + 1 ⁇ 1.75 ⁇ V + 1 (where, C, Si, Mn, Cu, Ni, Cr, Mo and V are the contents (mass%) of respective elements.)
  • DI* is set to less than 45, a quenching depth from a surface of the steel plate becomes less than 10 mm and hence, a lifetime of the steel plate as the abrasion resistant steel plate is shortened. Accordingly, DI* is limited 45 or more.
  • the range of DI* is preferably set to 75 or more.
  • Remaining other than the above-mentioned compositions are Fe and unavoidable impurities as a balance.
  • the abrasion resistant steel plate according to the present invention has the above-mentioned composition and the structure wherein an as-quenched martensitic phase forms a main phase and a grain size of prior austenite ( ⁇ ) grains is 30 ⁇ m or less. Further, the abrasion resistant steel plate according to the present invention has surface hardness of 450 or more at Brinel hardness HBW 10/3000. Here, a phase which occupies 90% or more in an area ratio is defined as "main phase".
  • As-quenched martensitic phase 90% or more in area ratio
  • phase fraction of the as-quenched martensitic phase is less than 90% in an area ratio
  • the steel plate cannot ensure desired hardness. Accordingly, when the area ratio is less than 90%, wear resistance of the steel plate is lowered so that desired wear resistance cannot be ensured. Further, the steel plate cannot ensure the sufficient low-temperature toughness.
  • tempered martensite phase Cr and Mo form carbide together with Fe when cementite is formed in tempering. Due to the formation of carbide, solute Cr and solute Mo, which are effective to ensure corrosion resistance, are decreased. Accordingly, the martensitic phase is held in the as-quenched martensitic phase where the martensitic phase is not tempered.
  • a phase fraction of the as-quenched martensitic phase is preferably set to 95% or more in area ratio, and it is more preferable that the phase fraction of the as-quenched martensitic phase is set to 98% or more in area ratio.
  • Grain size of prior austenite ( ⁇ ) grains 30 ⁇ m or less
  • the abrasion resistant steel plate according to the present invention having the above-mentioned composition and structure has surface hardness of 450 or more at Brinel hardness HBW 10/3000.
  • the surface hardness of steel is less than 450 at Brinel hardness HBW 10/3000, the lifetime of the abrasion resistant steel plate becomes short. Accordingly, the surface hardness is set to 450 or more at Brinel hardness HBW 10/3000. Brinel hardness is measured in accordance with the stipulation described in JIS Z 2243.
  • the steel material having the above-mentioned composition is produced by casting and then subjected to hot rolling without cooling when the steel material holds a predetermined temperature or subjected to hot rolling after cooling and reheating, thus manufacturing a steel plate having a desired size and a desired shape.
  • the method of manufacturing the steel material is not particularly limited. It is desirable that molten steel having the above-mentioned composition is produced using a known refining method such as using a converter, and a steel material such as a slab having a predetermined size is manufactured by a known casting method such as a continuous casting method. It goes without saying that a steel material can be manufactured by an ingot casting-blooming method.
  • the reheating temperature is preferably limited to a value which falls within a range from 950 to 1250°C.
  • the reheated steel material or the steel material which holds a predetermined temperature without being reheated is, then, subjected to hot rolling so that a steel plate having a desired size and a desired shape is manufactured.
  • the hot rolling condition is not particularly limited. After the hot rolling is finished, it is preferable that direct quenching treatment where the steel plate is immediately quenched is applied to the steel plate. It is preferable that a quenching start temperature is set to a temperature not below an Ar3 transformation point. To set the quenching start temperature to the Ar3 transformation point or higher, it is preferable that the hot rolling finish temperature is set to 800°C or more not below the Ar3 transformation point. When the hot rolling finish temperature is excessively high, there may be a case where crystal grains become coarse.
  • the hot rolling finish temperature is set to 950°C or below.
  • a quenching cooling rate is not particularly limited provided that the quenching cooling rate is equal to or higher than a cooling rate at which a martensitic phase is formed. It is desirable that the quenching cooling rate is as high as possible to prevent a martensitic phase from being self-tempered.
  • the solute Cr and the solute Mo which are effective for corrosion resistance, form carbide along with Fe when cementite is formed in the self-tempering, so that the amount of solute Cr and solute Mo is reduced. The self-tempering also reduces a volume fraction of martensite.
  • the quenching cooling rate is set to 65 to 75°C/s when a plate thickness is 5 to 15 mm, the quenching cooling rate is set to 40 to 55°C/s when the plate thickness is 16 to 22 mm, the quenching cooling rate is set to 30 to 40°C/s when the plate thickness is 22 to 28 mm, and the quenching cooling rate is set to 20 to 30°C/s when the plate thickness is 29 to 35 mm.
  • the cooling stop temperature is set to 300°C or below. It is more preferable that the cooling stop temperature is 200°C or below.
  • cooling rate is a cooling rate obtained by calculating a temperature of a center portion of a steel plate by heat transfer-heat conduction calculation.
  • treatment may be performed where the steel plate is gradually cooled by air after the hot rolling is finished (air cooling) and, thereafter, the steel plate is reheated to a predetermined heating temperature and, thereafter, the steel plate is quenched. It is desirable that the reheating temperature is set to a value which falls within a range from 850 to 950°C.
  • a quenching cooling rate after reheating is not particularly limited provided that the quenching cooling rate after reheating is equal to or higher than a cooling rate at which a martensitic phase is formed. It is desirable that the quenching cooling rate is as high as possible to prevent a martensitic phase from being self-tempered.
  • the solute Cr and the solute Mo which are effective for corrosion resistance, form carbide along with Fe when cementite is formed in the self-tempering, so that the amount of solute Cr and solute Mo is reduced.
  • the self-tempering also reduces a volume fraction of martensite. It is desirable that the quenching cooling rate is set to 65 to 75°C/s when a plate thickness is 5 to 15 mm, the quenching cooling rate is set to 40 to 55°C/s when the plate thickness is 16 to 22 mm, the quenching cooling rate is set to 30 to 40°C/s when the plate thickness is 22 to 28 mm, and the quenching cooling rate is set to 20 to 30°C/s when the plate thickness is 29 to 35 mm. Further, to prevent a martensitic phase from being self-tempered, it is preferable that the cooling stop temperature is set to 300°C or below. It is more preferable that the cooling stop temperature is set to 200°C or below.
  • tempering treatment is not performed after performing the above-mentioned treatment.
  • Molten steel having the composition described in Table 1 was produced by a vacuum melting furnace, and was cast into a mold so that ingots (steel material) having a weight of 150 kgf respectively were manufactured. These steel materials were reheated at heating temperatures described in Tables 2 (Table 2-1, Table 2-2, and Table 2-3) and, thereafter, the steel materials were subjected to hot rolling under conditions described in Table 2. Then, with respect to some steel plates, direct quenching treatment (DQ) where quenching (direct quenching) is immediately performed after hot rolling is finished was performed under conditions described in Tables 2.
  • DQ direct quenching treatment
  • reheating quenching treatment where a steel plate is cooled by air after hot rolling is finished on the respective conditions described in Table 2 and the steel plate is reheated at a temperature described in Tables 2 and, thereafter, is quenched was performed.
  • cooling rates from 800°C to 500°C at DQ or RQ were also indicated.
  • the transformation during cooling is started at a temperature of approximately 800°C and is completed at a temperature around 500°C. Therefore, a cooling rate from 800°C to 500°C largely influences the transformation behavior of steel. Accordingly, the cooling rate from 800°C to 500°C has been generally used as a representative cooling rate for estimating the transformation behavior of steel.
  • Specimens were sampled from the manufactured steel plates, and the specimens were subject to an observation of the structure, a surface hardness test, a Charpy impact test, and a corrosive wear resistance test. The following test methods were adopted. The results of the observation of the structure, the surface hardness test, the Charpy impact test, and the corrosive wear resistance test are shown in Table 3 (Table 3-1, Table 3-2, and Table 3-3).
  • Specimens for structure observation were sampled from manufactured steel plates at a position of 1/2 plate thickness of the steel plate such that an observation surface becomes a cross section parallel to the rolling direction.
  • the observation surface of the specimens for structure observation was polished and was etched by a picric acid thus exposing prior ⁇ grains. Thereafter, the observation surfaces were observed by an optical microscope (magnification: 400 times).
  • Equivalent circle diameters of respective 100 views of prior ⁇ grains were measured, an arithmetic mean was calculated based on obtained equivalent circle diameters, and the arithmetic mean was set as the prior ⁇ grain size of the steel plate.
  • Thin film specimens (specimens for observation of structure by transmission electron microscope) were sampled from the manufactured steel plates at a position of 1/4 plate thickness of the steel plate in the same way. Next, the thin film specimen was grinded and polished (mechanical polishing, electrolytic polishing) thus forming a thin film. Next, each 20 fields of vision of the thin film were observed by a transmission electron microscope (magnification: 20000 times), a region where cementite does not precipitate was recognized as a martensitic phase region, and the area of the region was measured. The area of the martensitic phase region was indicated by a ratio (%) with respect to the whole structure, and this ratio was set as a martensitic fraction (area ratio) . Also, a kind of a phase where cementite precipitates was determined.
  • Specimens for surface hardness measurement were sampled from the manufactured steel plates, and surface hardness HBW 10/3000 was measured in accordance with JIS Z 2243 (1998) .
  • a tungsten hard ball having a diameter of 10 mm was used, and a weight was set to 3000 kgf.
  • V-notched specimens were sampled from manufactured steel plates at a position of 1/4 plate thickness of the steel plate, in the direction (C direction) perpendicular to the rolling direction, and a Charpy impact test was performed in accordance with the stipulation of JIS Z 2242 (1998) . Absorbed energy vE -40 (J) was obtained under the condition of a test temperature at -40°C. The number of specimens was three for each of the steel plates, and an arithmetic mean of the obtained vales of three specimens is respectively set as the absorbed energy vE -40 of the steel plate. The steel plate having the absorbed energy vE -40 of 30 J or more was evaluated as the steel plate having excellent toughness.
  • Wear specimens (size: thickness of 10 mm, width of 25 mm and length of 75 mm) were sampled from manufactured steel plates at a position 1 mm away from a surface of the manufactured steel plate. These wear specimens were mounted on a wear tester, and a wear test was carried out.
  • the wear specimen was mounted on the wear tester such that the wear specimen was perpendicular to an axis of rotation of a rotor of the tester and a surface of 25 mm ⁇ 75 mm was parallel to the circumferential tangential direction of a rotating circle, the specimen and the rotor were covered with an outer vessel, and a wear material was introduced into the inside of the outer vessel.
  • a wear material a mixture is used where silica sand having an average grain size of 0.65 mm and an NaCl aqueous solution which was prepared such that the concentration becomes 15000 mass ppm were mixed together such that a weight ratio between silica sand and the NaCl aqueous solution becomes 3:2.
  • All of the present invention examples and reference examples exhibit high surface hardness of 450 or more in HBW 10/3000, excellent low-temperature toughness of vE -40 of 30 J or more, and excellent corrosive wear resistance of the wear resistance ratio of 1.5 or more.
  • the steel plate cooled with higher cooling rate has a higher martensitic fraction.
  • the steel plate having martensitic fraction of 98% or more exhibits excellent corrosive wear resistance in particular, as compared with the steel plate having martensitic fraction of less than 98% and having same composition.
  • the comparative examples which fall outside the scope of the present invention exhibit lowering of surface hardness, lowering of low-temperature toughness, lowering of corrosive wear resistance or lowering of two or more of these properties.
EP13839513.2A 2012-09-19 2013-09-13 Wear-resistant steel plate having excellent low-temperature toughness and corrosion wear resistance Active EP2873748B1 (en)

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CL2015000661A1 (es) 2015-08-21
KR20150038590A (ko) 2015-04-08
EP2873748A1 (en) 2015-05-20
CN104685088A (zh) 2015-06-03
BR112015005951A2 (pt) 2017-07-04
US20150232971A1 (en) 2015-08-20
PE20150790A1 (es) 2015-05-30
JPWO2014045552A1 (ja) 2016-08-18
WO2014045552A1 (ja) 2014-03-27
AU2013319621A1 (en) 2015-02-26
IN2015DN00771A (es) 2015-07-03
EP2873748A4 (en) 2015-10-28
AU2013319621B2 (en) 2016-10-13
MX2015003379A (es) 2015-06-05

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