WO2017095049A1 - 저온 충격 인성이 우수한 선재 및 그 제조방법 - Google Patents
저온 충격 인성이 우수한 선재 및 그 제조방법 Download PDFInfo
- Publication number
- WO2017095049A1 WO2017095049A1 PCT/KR2016/013365 KR2016013365W WO2017095049A1 WO 2017095049 A1 WO2017095049 A1 WO 2017095049A1 KR 2016013365 W KR2016013365 W KR 2016013365W WO 2017095049 A1 WO2017095049 A1 WO 2017095049A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- impact toughness
- wire rod
- temperature impact
- manganese
- carbon
- Prior art date
Links
Classifications
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
Definitions
- the present invention relates to a steel wire having excellent low temperature impact toughness used in industrial machinery or automobile parts and the like and a method of manufacturing the same.
- Ferrite or pearlite structures in wire rods have limitations in securing high strength and high impact toughness.
- Materials with these textures usually have high impact toughness but relatively low strength, and cold drawing to increase the strength can yield high strength, but impact toughness drops sharply in proportion to the increase in strength. have.
- the present invention is to provide a wire rod having a high strength and excellent impact toughness even in a low temperature environment and a method of manufacturing the same.
- the present invention is in weight%, carbon (C): 0.40 to 0.90%, silicon (Si): 0.5 to 1.0%, manganese (Mn): 11 to 25%, copper (Cu): 1.0 to 3.0%, phosphorus (P ): 0.020% or less, sulfur (S): 0.020% or less, aluminum (Al): 0.010% to 0.050%, nitrogen (N): 0.0010% to 0.0050%, the remainder includes Fe and unavoidable impurities, and the carbon (C)
- the content of and manganese (Mn) satisfies the following relation 1,
- the microstructure provides a wire rod having excellent low-temperature impact toughness including an austenitic phase of 95% or more in area fraction and having a volume fraction of deformation twin formed in the austenite grains of 1 to 8%.
- the present invention comprises the steps of preparing a steel that satisfies the composition and relationship 1;
- It provides a method of producing a wire with excellent low-temperature impact toughness, including cold drawing the cooled steel at a cross-sectional reduction rate of 10 to 30%.
- the wire rod of the present invention can provide a wire rod having excellent high strength and low temperature impact toughness required for industrial machinery and automotive materials or components by controlling the stacking defect energy and microstructure to a certain level.
- the wire rod of the present invention is by weight, carbon (C): 0.40 to 0.90%, silicon (Si): 0.5 to 1.0%, manganese (Mn): 11 to 25%, copper (Cu): 1.0 to 3.0%, phosphorus (P): 0.020% or less, sulfur (S): 0.020% or less, aluminum (Al): 0.010% to 0.050%, nitrogen (N): 0.0010% to 0.0050%, the rest includes Fe and unavoidable impurities.
- Carbon is an essential element for securing strength, and is dissolved in steel to change the stacking defect energy to change the deformation mode during cold working. If the carbon content is less than 0.40%, the stacking defect energy is too low, thus dislocation propagation and deformation twin formation is not active, so that the target strength is difficult to be obtained. When the carbon content exceeds 0.90%, grain boundary carbide is formed during cooling due to excess carbon content. Due to the grain boundary embrittlement, the ductility and impact toughness can be drastically lowered. For this reason, in this invention, it is preferable to contain carbon content in 0.40 to 0.90%.
- Silicon is an element which is dissolved in austenite upon addition and is effective for enhancing strength through solid solution strengthening, dislocation strengthening, and deformation twin formation of steel.
- the addition of silicon can change the stacking defect energy, the dislocation propagation and the formation of strain twins can be facilitated, thereby increasing the strength.
- the silicon content is less than 0.5%, the effect of the addition of silicon is insignificant, if it exceeds 1.0%, the strength is greatly increased, but the ductility and impact toughness can be drastically reduced.
- the silicon content is 0.5 to 1.0%.
- Manganese is an element that can be dissolved in austenite to make the austenite phase very stable, and increase the stacking defect energy to actively cause dislocation propagation and deformation twin formation.
- the lamination defect energy is low, so that ⁇ -martensite (epsilon martensite) is generated during cold drawing or cold working, and brittleness may occur, and when it exceeds 25%, it is economically disadvantageous and hot.
- ⁇ -martensite epsilon martensite
- the internal oxidation is severe and may cause a problem of poor surface quality.
- the content of manganese is contained in 11 to 25%.
- Copper is one of the main elements to stabilize the austenite phase, which increases the lamination defect energy and contributes to the growth of dislocations and formation of strain twins even during cold drawing.
- copper is an element that greatly increases resistance to hydrogen delayed fracture, which is considered important in high strength steel.
- the content of copper is less than 1.0%, it is difficult to expect the effect by the addition of copper, and when it exceeds 3.0%, the hot rolling property is inferior and may cause surface defects. Therefore, in the present invention, the content of copper is included in 1.0 ⁇ 3.0%.
- Phosphorus (P) 0.020% or less
- phosphorus is segregated at grain boundaries to lower toughness and reduce delayed fracture resistance, it is preferable not to be included as much as possible, and for this reason, the upper limit thereof is limited to 0.020%.
- the sulfur segregates at grain boundaries, lowers toughness, forms low melting emulsions, and inhibits hot rolling, so it is preferably not included. For this reason, the upper limit of the present invention is limited to 0.020%.
- Aluminum is a powerful deoxidation element that removes oxygen from steel to improve cleanliness, and combines with nitrogen dissolved in steel to form AlN, and can improve impact toughness through grain refinement. If the aluminum content is less than 0.010%, it is difficult to expect the effect of the addition, if it exceeds 0.050% a large amount of alumina inclusions are generated can greatly reduce the mechanical properties. Therefore, in the present invention, aluminum is included as 0.010 ⁇ 0.050%.
- the nitrogen is an element that can change the stacking defect energy to cause an increase in strength. If the content of nitrogen is less than 0.0010%, it is difficult to expect the addition effect, if the content exceeds 0.0050% may rather adversely affect the impact toughness. Therefore, in the present invention, the content is preferably set to 0.0010 to 0.0050%.
- the rest includes Fe and unavoidable impurities.
- the present invention does not exclude the addition of alloys other than the alloy compositions mentioned above.
- the wire rod of the present invention is preferably contained so that the carbon and manganese satisfy the following relational formula (1).
- carbon (C) and manganese (Mn) means the content based on the weight of the corresponding element, respectively
- the carbon and manganese increases the stacking fault energy, and the temperature of the stacking fault energy decreases as temperature decreases, thereby controlling the stacking fault energy in the range of 20 to 25 mJ / m 2. do.
- the present invention provides a high-strength non-coarse wire rod by utilizing a twin-twist deformation mechanism (TWIP) at room temperature, and achieves excellent impact toughness through modified organic martensite transformation (TRIP) at low temperatures.
- TWIP twin-twist deformation mechanism
- the wire rod of the present invention can actively dislocation propagation and deformation twin formation through cold working at room temperature, greatly increase the work hardening rate, and obtain the target high strength.
- the wire rod of the present invention when used at low temperature, when external deformation or impact is applied, martensite transformation is more easily generated than dislocation propagation or deformation twin formation, thereby greatly improving impact toughness.
- the present inventors have focused on the above-mentioned contents, and as a result of repeated studies and experiments, when the relationship between carbon and manganese satisfies 9 ⁇ C x Mn ⁇ 11 based on weight%, the wire rod of austenite structure having excellent low-temperature impact toughness is produced. It can be provided that the relation 1 is presented.
- the value of C ⁇ Mn is 9 or less, the lamination defect energy is so low that the deformation mechanism due to twins does not appear at room temperature deformation, and the lamination defect energy is too high at 11 or higher, so the strength improvement effect due to twins at room temperature deformation can be secured.
- a microstructure consists of austenite single phase.
- the area fraction has a microstructure composed of 100% austenite phase.
- the wire rod of the present invention is preferably made of austenite of 95% or more in area fraction.
- ⁇ -martensite or grain boundary carbide is formed in the steel, brittleness is likely to occur in the steel material, and therefore, it is preferable that the above structure is not included.
- the epsilon-martensite or grain boundary carbide is preferably contained in an area fraction of 5% or less in a range that does not impair the physical properties of the present invention.
- the above object can be effectively achieved by controlling the cooling rate during cooling after hot rolling of the steel together with the following appropriate component control.
- the wire rod of the present invention preferably has a grain size of 30 ⁇ m or less of the austenite. If the grain size exceeds 30 ⁇ m the impact toughness improving effect is not sufficient, so that the grain size is controlled to 30 ⁇ m or less through the hot rolling temperature and cooling rate control. On the other hand, when the cold drawing process is performed in the manufacturing method of this invention mentioned later, although a crystal grain is extended in a longitudinal direction, there is no big change in average grain size.
- deformation twins are formed in a volume fraction of 1 to 8% in the austenite grains. If the strained twin is less than 1% by volume fraction, the target strength cannot be secured. If the strained twin is more than 8%, the target toughness may not only exceed the target strength but also the impact toughness may be drastically reduced.
- the strained twins have a thickness of 15-35 nm, and the twin inter-lamellar spacings of the twins are preferably in the range of 40-100 nm, wherein the thickness of the strained twins is less than 15 nm or the lamellar spacing is 40 nm. If it is less than the target strength, it is not preferable.
- the characteristics of the modified twin can be effectively achieved by controlling the reduction rate during cold drawing to 10 to 30%, as will be described later.
- the wire is preferably made of ⁇ 111> and ⁇ 100> fiber-texture. This is because the grains during cold drawing are rotated in the ⁇ 111> and ⁇ 100> directions to facilitate the generation of strain twins, and the active hardening of these strain twins improves the work hardening rate to reach the target strength.
- the wire rod manufacturing method of the present invention comprises the steps of preparing a steel that satisfies the above composition; Reheating the steel; Hot rolling the reheated steel; Cooling the hot rolled steel; And cold drawing the cooled steel.
- a steel material satisfying the above-described composition range is prepared. Thereafter, the steel is reheated. It is preferable to perform the reheating temperature range employ
- the reheated steel is hot rolled. It is preferable to manage the finishing hot rolling temperature of the said hot rolling in the range of 750-850 degreeC. If the finishing hot rolling temperature is less than 750 °C, the surface defects of the steel is likely to be caused, and if the finishing hot rolling temperature is higher than 850 °C, the crystal grains do not become fine, so that the desired mechanical properties cannot be obtained, the finishing hot rolling temperature is 750 ⁇ 850 °C It is preferable to carry out in the temperature range of.
- the hot rolled steel is cooled.
- the section from the cooling start temperature to the cooling end temperature is preferably cooled at a cooling rate of 1 to 5 ° C / s. If the cooling rate is less than 1 °C / s, ductility and impact toughness can be drastically lowered by the formation of grain boundary carbide, and if it exceeds 5 °C / s because it is difficult to ensure a uniform microstructure cooling rate is 1 ⁇ It is preferable to set it as 5 degrees C / s.
- the cooling start temperature is not particularly defined, and means a temperature after finishing hot rolling, and the cooling end temperature means a point where cooling is completed to room temperature.
- the cold working is performed on the cooled steel. It is preferable to use the cold drawing die for the said cold working, and it is preferable to perform cold reduction rate at 10 to 30% at this time. If the cold reduction rate is less than 10%, it is difficult to secure the strength to be implemented in the present invention, if it exceeds 30%, the cold reduction rate is 10 to 30% because it exceeds the required strength range and greatly reduces the ductility It is desirable to.
- a strain twin is formed in austenite grains in a volume fraction of 1 to 8%, and the thickness of the strain twin of the wire is It is preferably 15 to 35 nm, and the twin inter-lamellar spacing of the twin is preferably in the range of 40 to 100 nm. This can be achieved by controlling the cold reduction rate upon cold drawing.
- the wire rod of the present invention has a tensile strength of 1400 to 1600 MPa, and can secure an impact value in the range of 100 to 150 J / cm 2 even at room temperature and -40 ° C.
- the wire rod manufactured as described above was subjected to cold drawing at the reduction ratio of Table 2, and then measured in tensile strength and impact value.
- austenite grain size was measured using an image analyzer, and the thickness, lamellar spacing, and volume fraction of the strained twins were determined using transmission electron microscope (TEM) and backscattering electron diffraction (EBSD) equipment. Aggregates were also analyzed using backscattered electron diffraction (EBSD).
- TEM transmission electron microscope
- EBSD backscattering electron diffraction
- the room temperature tensile test was carried out at a rate of 0.9 mm / min to the yield point, 6 mm / min after that to measure the tensile strength and elongation.
- the impact test was carried out at room temperature and -40 °C using an impact tester having a curvature of the striker edge portion of 2mm and a test capacity of 500J to impact the specimen.
- Equation 1 in Table 1 is C ⁇ Mn, the rest is Fe and inevitable impurities
- the emphasis component is within the scope of the present invention, satisfies the relation 1 (9 ⁇ C x Mn ⁇ 11), and also satisfies the preparation method of the present invention.
- the mechanical properties can also be seen that the tensile strength of 1400 ⁇ 1600MPa and the impact value of 100 ⁇ 150J / cm2. This property is because the lamination defect energy is controlled to a certain level so that the target strength is obtained by high work hardening during cold drawing, and the shock can be absorbed by martensite transformation during cold impact.
- Comparative Examples 7 and 10 are cases in which carbon and manganese contents are outside the scope of the present invention, and do not satisfy the relational formula (1). Therefore, even cold drawing shows that dislocation propagation and deformation twin formation are not active and thus the tensile strength does not reach the target properties.
- Comparative Example 8 is a case where the carbon content is out of the range of the present invention, and greatly out of relation 1, so that the stack defect energy is increased to the extent that dislocation propagation and deformation twin formation occurs very actively. Accordingly, it can be seen that the work hardening proceeds rapidly during cold drawing, so that the tensile strength exceeds the target, but the impact toughness is inferior.
- Comparative Example 9 is a case in which the silicon deviates beyond the scope of the present invention, although it satisfies the relation 1, it can be seen that the impact toughness is inferior due to the reinforcing effect of the silicon.
- Comparative Example 11 is a case in which the emphasis component satisfies the scope of the present invention, but the relational formula 1 does not satisfy the scope of the present invention, while sufficient strength can be secured by work hardening at cold drawing, but martensite at low temperature impact. It can be seen that no site phase transformation occurs and the impact toughness at low temperature is inferior rapidly.
- Comparative Example 12 is a case in which the emphasis component and the relational formula 1 satisfy the scope of the present invention, or the austenite grain size becomes excessively large due to the cooling rate being too slow in the manufacturing process, and as a result, grain boundary carbide is formed and the impact toughness is inferior. Indicates deterioration.
- the stress component satisfies the scope of the present invention and also satisfies the relational formula 1, while the cold drawing amount exceeds 30%, but the strength sharply increases, but the ductility is poor, eventually impact toughness is very inferior. Shows the sunset.
Landscapes
- 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)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Conductive Materials (AREA)
Abstract
Description
구분 | No. | 조성(중량%) | 관계식 1 | |||||||
C | Si | Mn | Cu | P | S | Al | N | |||
발명예 | 1 | 0.40 | 0.7 | 23 | 2.3 | 0.017 | 0.019 | 0.029 | 0.0047 | 9.2 |
2 | 0.49 | 0.5 | 20 | 1.6 | 0.014 | 0.016 | 0.015 | 0.0043 | 9.8 | |
3 | 0.60 | 0.6 | 18 | 2.1 | 0.016 | 0.013 | 0.018 | 0.0045 | 10.8 | |
4 | 0.71 | 0.5 | 14 | 1.4 | 0.015 | 0.014 | 0.034 | 0.0046 | 9.9 | |
5 | 0.82 | 0.8 | 13 | 2.7 | 0.013 | 0.010 | 0.041 | 0.0038 | 10.7 | |
6 | 0.88 | 0.9 | 11 | 2.5 | 0.015 | 0.014 | 0.023 | 0.0039 | 9.7 | |
비교예 | 7 | 0.32 | 0.6 | 26 | 1.5 | 0.011 | 0.009 | 0.018 | 0.0037 | 8.3 |
8 | 1.20 | 0.9 | 17 | 2.2 | 0.014 | 0.014 | 0.019 | 0.0046 | 20.4 | |
9 | 0.53 | 1.8 | 19 | 2.0 | 0.013 | 0.010 | 0.027 | 0.0039 | 10.1 | |
10 | 0.72 | 0.7 | 9 | 0.3 | 0.017 | 0.014 | 0.036 | 0.0042 | 6.5 | |
11 | 0.80 | 0.5 | 15 | 3.4 | 0.017 | 0.017 | 0.017 | 0.0049 | 12.0 | |
12 | 0.89 | 0.8 | 12 | 1.8 | 0.013 | 0.012 | 0.022 | 0.0033 | 10.7 | |
13 | 0.57 | 0.7 | 19 | 2.0 | 0.015 | 0.014 | 0.023 | 0.0041 | 10.8 | |
14 | 0.45 | 0.5 | 22 | 2.1 | 0.012 | 0.017 | 0.025 | 0.0046 | 9.9 | |
15 | 0.61 | 0.6 | 17 | 1.8 | 0.016 | 0.015 | 0.018 | 0.0039 | 10.4 |
구분 | No. | 냉각속도(℃/s) | γ결정입도(㎛) | 냉간 감면율(%) | 쌍정분율(%) | 쌍정두께(㎚) | 쌍정 라멜라 간격(㎚) | 인장강도(MPa) | 연신율(%) | 충격치(J/㎠) | |
상온 | -40℃ | ||||||||||
발명예 | 1 | 5 | 21 | 16 | 4 | 30 | 83 | 1405 | 15 | 141 | 143 |
2 | 3 | 26 | 13 | 3 | 19 | 76 | 1430 | 13 | 129 | 132 | |
3 | 2 | 28 | 27 | 7 | 25 | 57 | 1470 | 12 | 121 | 125 | |
4 | 4 | 23 | 20 | 5 | 28 | 62 | 1525 | 11 | 113 | 114 | |
5 | 3 | 25 | 22 | 6 | 32 | 44 | 1562 | 11 | 109 | 108 | |
6 | 1 | 30 | 18 | 5 | 22 | 50 | 1591 | 10 | 102 | 103 | |
비교예 | 7 | 2 | 28 | 15 | 0.5 | 31 | - | 1070 | 18 | 160 | 135 |
8 | 4 | 22 | 26 | 11 | 23 | 35 | 1684 | 8 | 87 | 33 | |
9 | 1 | 29 | 23 | 4 | 27 | 52 | 1559 | 9 | 85 | 32 | |
10 | 5 | 20 | 18 | 0.3 | 29 | - | 1138 | 17 | 153 | 126 | |
11 | 3 | 25 | 22 | 9 | 25 | 60 | 1573 | 11 | 110 | 46 | |
12 | 0.1 | 42 | 25 | 6 | 35 | 55 | 1586 | 5 | 64 | 24 | |
13 | 3 | 26 | 39 | 10 | 27 | 37 | 1652 | 8 | 84 | 30 | |
14 | 3 | 27 | 61 | 11 | 25 | 34 | 1822 | 7 | 67 | 21 | |
15 | 3 | 25 | 78 | 12 | 22 | 30 | 2035 | 5 | 32 | 10 |
Claims (9)
- 중량%로, 탄소(C): 0.40~0.90%, 실리콘(Si): 0.5~1.0%, 망간(Mn): 11~25%, 구리(Cu): 1.0~3.0%, 인(P): 0.020% 이하, 황(S): 0.020% 이하, 알루미늄(Al): 0.010~0.050%, 질소(N): 0.0010~0.0050%, 나머지는 Fe 및 불가피한 불순물을 포함하고, 상기 탄소(C)와 망간(Mn)의 함량은 하기 관계식 1을 만족하며,미세조직은 면적분율로 95% 이상의 오스테나이트 상을 포함하고, 상기 오스테나이트 결정립내에 형성된 변형 쌍정(deformation twin)의 부피 분율이 1~8%인 저온 충격 인성이 우수한 선재.[관계식 1]9 < C×Mn < 11(단, 상기 관계식 1 중 탄소(C)와 망간 (Mn)은 각각 해당원소의 중량기준 함량을 의미한다)
- 청구항 1에 있어서,상기 오스테나이트의 결정립도는 30㎛ 이하인 저온 충격 인성이 우수한 선재.
- 청구항 1에 있어서,상기 쌍정의 두께는 15~35㎚인 저온 충격 인성이 우수한 선재.
- 청구항 1에 있어서,상기 쌍정의 라멜라 간격은 40~100㎚인 저온 충격 인성이 우수한 선재.
- 청구항 1에 있어서,상기 선재는 <111>과 <100> 섬유 집합조직(fiber texture)를 포함하는 저온 충격 인성이 우수한 선재.
- 중량%로, 탄소(C): 0.40~0.90%, 실리콘(Si): 0.5~1.0%, 망간(Mn): 11~25%, 구리(Cu): 1.0~3.0%, 인(P): 0.020% 이하, 황(S): 0.020% 이하, 알루미늄(Al): 0.010~0.050%, 질소(N): 0.0010~0.0050%, 나머지는 Fe 및 불가피한 불순물을 포함하고, 상기 탄소(C)와 망간(Mn)의 함량은 하기 관계식 1을 만족하는 강재를 준비하는 단계;상기 강재를 재가열하는 단계;상기 재가열된 강재를 열간압연 하는 단계;상기 열간압연된 강재를 냉각하는 단계; 및상기 냉각된 강재를 10~30%의 단면 감소율로 냉간 신선하는 단계를 포함하는 저온 충격 인성이 우수한 선재의 제조방법.[관계식 1]9 < C×Mn < 11(단, 상기 관계식 1 중 탄소(C)와 망간 (Mn)은 각각 해당원소의 중량기준 함량을 의미한다)
- 청구항 6에 있어서,상기 재가열은 950~1050℃의 온도범위로 행하는 저온 충격 인성이 우수한 선재의 제조방법.
- 청구항 6에 있어서,상기 열간압연은 750~850℃의 온도범위에서 마무리 열간압연하는 저온 충격 인성이 우수한 선재의 제조방법.
- 청구항 6에 있어서,상기 냉각은 1~5℃/s의 속도로 행하는 저온 충격 인성이 우수한 선재의 제조방법.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201680070455.8A CN108368588B (zh) | 2015-12-04 | 2016-11-18 | 具有优异的低温冲击韧性的线材及其制造方法 |
DE112016005557.9T DE112016005557T5 (de) | 2015-12-04 | 2016-11-18 | Walzdraht mit ausgezeichneter schlagzähigkeit bei niedriger temperatur und herstellungsverfahren davon |
JP2018520435A JP6600411B2 (ja) | 2015-12-04 | 2016-11-18 | 低温衝撃靭性に優れた線材及びその製造方法 |
US15/772,495 US11136637B2 (en) | 2015-12-04 | 2016-11-18 | Wire rod having excellent low temperature impact toughness and manufacturing method therefor |
MX2018006542A MX2018006542A (es) | 2015-12-04 | 2016-11-18 | Alambron que tiene excelente dureza de impacto a baja temperatura y metodo de manufactura para el mismo. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2015-0172683 | 2015-12-04 | ||
KR1020150172683A KR101726081B1 (ko) | 2015-12-04 | 2015-12-04 | 저온 충격 인성이 우수한 선재 및 그 제조방법 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017095049A1 true WO2017095049A1 (ko) | 2017-06-08 |
Family
ID=58580514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2016/013365 WO2017095049A1 (ko) | 2015-12-04 | 2016-11-18 | 저온 충격 인성이 우수한 선재 및 그 제조방법 |
Country Status (7)
Country | Link |
---|---|
US (1) | US11136637B2 (ko) |
JP (1) | JP6600411B2 (ko) |
KR (1) | KR101726081B1 (ko) |
CN (1) | CN108368588B (ko) |
DE (1) | DE112016005557T5 (ko) |
MX (1) | MX2018006542A (ko) |
WO (1) | WO2017095049A1 (ko) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102020386B1 (ko) * | 2017-12-24 | 2019-09-10 | 주식회사 포스코 | 고 강도 오스테나이트계 고 망간 강재 및 그 제조방법 |
CN113275405B (zh) * | 2021-04-23 | 2024-02-06 | 中国科学院合肥物质科学研究院 | 一种twip钢丝直接拉拔成形的方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001049348A (ja) * | 1999-07-07 | 2001-02-20 | Usinor | 鉄−炭素−マンガン合金からなるストリップを製造するための方法およびそれによって製造されたストリップ |
KR101127532B1 (ko) * | 2003-07-22 | 2012-04-18 | 아르셀러 프랑스 | 높은 강도와 우수한 인성을 갖는 냉간 성형에 적합한오스테나이트 철강/탄소강/망간 강판의 제조 방법 및 그에따라 제조된 강판 |
KR20120104021A (ko) * | 2011-03-11 | 2012-09-20 | 포항공과대학교 산학협력단 | 냉간 압조성이 우수한 고강도 고망간 강선재와 그 제조방법 및 상기 강선재를 이용한 볼트의 제조방법 |
KR20140021165A (ko) * | 2012-08-09 | 2014-02-20 | 주식회사 포스코 | 강도와 연성이 우수한 강선재 및 그 제조방법 |
KR20140083795A (ko) * | 2012-12-26 | 2014-07-04 | 주식회사 포스코 | 용접열영향부 인성이 우수한 고강도 오스테나이트계 강재 및 그 제조방법 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07107187B2 (ja) * | 1990-10-15 | 1995-11-15 | 新日本製鐵株式会社 | 応力腐食割れ感受性の小さい高Mn非磁性鋼 |
EP1900837B1 (en) * | 2005-06-29 | 2020-09-23 | Nippon Steel Corporation | High-strength wire rod excelling in wire drawing performance and high strength steel wire |
KR101280500B1 (ko) | 2010-11-22 | 2013-07-01 | 포항공과대학교 산학협력단 | 수소지연파괴 저항성이 우수한 고강도 고망간 강선재 및 그 제조방법 |
JP2013023742A (ja) * | 2011-07-22 | 2013-02-04 | Kobe Steel Ltd | 非磁性鋼線材又は棒鋼 |
JP5618932B2 (ja) * | 2011-07-22 | 2014-11-05 | 株式会社神戸製鋼所 | 非磁性鋼線材又は棒鋼、及びその製造方法 |
KR101353649B1 (ko) * | 2011-12-23 | 2014-01-20 | 주식회사 포스코 | 내부식성이 우수한 스프링용 선재 및 강선, 스프링용 강선 및 스프링의 제조방법 |
WO2014104706A1 (ko) * | 2012-12-26 | 2014-07-03 | 주식회사 포스코 | 용접열영향부 인성이 우수한 고강도 오스테나이트계 강재 및 그 제조방법 |
BR112016000669B1 (pt) * | 2013-07-26 | 2024-02-15 | Nippon Steel Corporation | Tubo de aço de alta resistência para poço de petróleo e tubos de poço de petróleo |
KR20150075336A (ko) | 2013-12-25 | 2015-07-03 | 주식회사 포스코 | 피로균열 저항성이 우수한 저온용강 |
-
2015
- 2015-12-04 KR KR1020150172683A patent/KR101726081B1/ko active IP Right Grant
-
2016
- 2016-11-18 WO PCT/KR2016/013365 patent/WO2017095049A1/ko active Application Filing
- 2016-11-18 US US15/772,495 patent/US11136637B2/en active Active
- 2016-11-18 DE DE112016005557.9T patent/DE112016005557T5/de not_active Withdrawn
- 2016-11-18 CN CN201680070455.8A patent/CN108368588B/zh not_active Expired - Fee Related
- 2016-11-18 MX MX2018006542A patent/MX2018006542A/es unknown
- 2016-11-18 JP JP2018520435A patent/JP6600411B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001049348A (ja) * | 1999-07-07 | 2001-02-20 | Usinor | 鉄−炭素−マンガン合金からなるストリップを製造するための方法およびそれによって製造されたストリップ |
KR101127532B1 (ko) * | 2003-07-22 | 2012-04-18 | 아르셀러 프랑스 | 높은 강도와 우수한 인성을 갖는 냉간 성형에 적합한오스테나이트 철강/탄소강/망간 강판의 제조 방법 및 그에따라 제조된 강판 |
KR20120104021A (ko) * | 2011-03-11 | 2012-09-20 | 포항공과대학교 산학협력단 | 냉간 압조성이 우수한 고강도 고망간 강선재와 그 제조방법 및 상기 강선재를 이용한 볼트의 제조방법 |
KR20140021165A (ko) * | 2012-08-09 | 2014-02-20 | 주식회사 포스코 | 강도와 연성이 우수한 강선재 및 그 제조방법 |
KR20140083795A (ko) * | 2012-12-26 | 2014-07-04 | 주식회사 포스코 | 용접열영향부 인성이 우수한 고강도 오스테나이트계 강재 및 그 제조방법 |
Also Published As
Publication number | Publication date |
---|---|
US11136637B2 (en) | 2021-10-05 |
CN108368588A (zh) | 2018-08-03 |
US20190078174A1 (en) | 2019-03-14 |
JP6600411B2 (ja) | 2019-10-30 |
KR101726081B1 (ko) | 2017-04-12 |
DE112016005557T5 (de) | 2018-08-23 |
MX2018006542A (es) | 2018-08-15 |
JP2019502814A (ja) | 2019-01-31 |
CN108368588B (zh) | 2020-03-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2017082684A1 (ko) | 냉간단조성이 우수한 선재 및 그 제조방법 | |
WO2018117646A1 (ko) | 극저온 충격인성이 우수한 후강판 및 이의 제조방법 | |
WO2016099191A1 (ko) | 방향성 전기강판 및 그 제조방법 | |
WO2009145563A2 (ko) | 열처리성이 우수한 초고강도 열간성형 가공용 강판, 열처리 경화형 부재 및 이들의 제조방법 | |
WO2018074887A1 (ko) | 고강도 철근 및 이의 제조 방법 | |
WO2018117712A1 (ko) | 저온인성 및 항복강도가 우수한 고 망간 강 및 제조 방법 | |
WO2017082687A1 (ko) | 냉간가공성이 우수한 비조질 선재 및 그 제조방법 | |
WO2015099222A1 (ko) | 용접성 및 버링성이 우수한 열연강판 및 그 제조방법 | |
WO2018117614A1 (ko) | 표면부 nrl-dwt 물성이 우수한 극후물 강재 및 그 제조방법 | |
WO2019132179A1 (ko) | 고강도 고인성 열연강판 및 그 제조방법 | |
WO2017095049A1 (ko) | 저온 충격 인성이 우수한 선재 및 그 제조방법 | |
WO2021172604A1 (ko) | 신선가공성 및 충격인성이 우수한 비조질 선재 및 그 제조방법 | |
WO2021010599A2 (ko) | 강도가 향상된 오스테나이트계 스테인리스강 및 그 제조 방법 | |
WO2016072679A1 (ko) | 강도와 충격 인성이 우수한 선재 및 그 제조방법 | |
WO2019125025A1 (ko) | 고 강도 오스테나이트계 고 망간 강재 및 그 제조방법 | |
WO2011081236A1 (ko) | 열간 프레스 가공성이 우수한 열처리 강화형 강판 및 그 제조방법 | |
WO2018110850A1 (ko) | 충격인성이 우수한 고강도 선재 및 그 제조방법 | |
WO2015060499A1 (ko) | 방진성이 우수한 고강도 고망간 강판 및 그 제조방법 | |
WO2017111303A1 (ko) | 굽힘 가공성이 우수한 고강도 열연 강판 및 그 제조 방법 | |
WO2020085852A1 (ko) | 항복강도가 우수한 오스테나이트계 고망간 강재 및 그 제조방법 | |
WO2020130614A2 (ko) | 구멍확장성이 우수한 고강도 열연강판 및 그 제조방법 | |
WO2019039774A1 (ko) | 저온 충격인성이 개선된 페라이트계 스테인리스강 및 이의 제조 방법 | |
WO2019031681A1 (ko) | 우수한 강도와 연신율을 갖는 열연강판 및 제조방법 | |
WO2021125710A1 (ko) | 신선가공성 및 충격인성이 우수한 비조질 선재 및 그 제조방법 | |
WO2018110851A1 (ko) | 강도 및 연성이 우수한 선재 및 그 제조방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16870945 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2018520435 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: MX/A/2018/006542 Country of ref document: MX |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112016005557 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 16870945 Country of ref document: EP Kind code of ref document: A1 |