A high damping alloy material and a method for preparing the same

Abstract

This invention discloses a high-damping alloy material and its preparation method, belonging to the field of alloy preparation technology. The material comprises the following raw materials by weight percentage: 2.9%~4.8% nano-HfO2 modified AlCuMn quasicrystalline particles, C: 0.01%~0.03%, Si≤0.8wt%, Mn: 3.5%~4.2%, Al: 16.2%~18.6%, Mo: 0.5%~1.3%, Zn: 0.1%~0.25%, Sc: 0.15%~0.27%, Sb: 0.05%~0.1%, V: 0.01%~0.03%, RE: 0.008%~0.02%, Nb: 0.008%~0.015%, Ti: 0.012%~0.021%, with the balance being Fe and unavoidable impurities. The AlCuMn quasicrystalline particles of this invention are derived from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are formed by bonding nano-HfO2 to the surface. The high-damping alloy steel parts have the following properties: specific damping performance (SDC) of 39.3~39.8%, yield strength of 443~468 MPa, tensile strength of 762~794 MPa, and elongation of 36.9~37.9%. This effectively achieves a synergistic improvement in both damping performance and mechanical strength.

Description

Technical Field

[0001] This invention relates to the field of alloy preparation technology, specifically to a high-damping alloy material and its preparation method. Background Technology

[0002] Damping alloys dissipate mechanical energy by converting it into heat through an internal damping mechanism. Iron-based damping alloys offer higher strength compared to magnesium / copper-based alloys, making them widely used in engineering. However, the specific damping capacity (SDC) of iron-based alloys is significantly lower than that of magnesium and copper-based alloys. Effectively balancing the improvement of damping performance with mechanical strength has become a key research focus and challenge.

[0003] Existing technologies include adding quasicrystalline particles as reinforcing particles to alloys to improve damping performance. However, simply adding quasicrystalline particles results in poor interfacial bonding between the particles and the alloy matrix, and an oxide layer easily forms on the particle surface, thus limiting the improvement in damping performance.

[0004] Based on this, the present invention designs a high-damping alloy material and its preparation method to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a high-damping alloy material and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-damping alloy material comprises the following raw materials in weight percentages: 2.9%~4.8% nano-HfO2 modified AlCuMn quasicrystalline particles, C: 0.01%~0.03%, Si≤0.8wt%, Mn: 3.5%~4.2%, Al: 16.2%~18.6%, Mo: 0.5%~1.3%, Zn: 0.1%~0.25%, Sc: 0.15%~0.27%, Sb: 0.05%~0.1%, V: 0.01%~0.03%, RE: 0.008%~0.02%, Nb: 0.008%~0.015%, Ti: 0.012%~0.021%, with the balance being Fe and unavoidable impurities;

[0008] And it meets the following conditions:

[0009] 3.7 ≤ AlCuMn quasicrystalline particles / Mo ≤ 5.8; 0.17% ≤ Sc + RE ≤ 0.28%; 3.6% ≤ 1.0 × AlCuMn quasicrystalline particles + 0.1 × Mn + 0.3 × Mo + 0.5 × Sb + 0.8 × Sc + 0.4 × V + 0.4 × Nb + 0.6 × Ti ≤ 5.9%;

[0010] The AlCuMn quasicrystalline particles are made from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are formed by bonding nano-HfO2 to the surface.

[0011] Furthermore, the specific preparation method of AlCuMn quasicrystalline particles is as follows:

[0012] (1) The AlCuMn quasicrystalline particles were divided into three parts: AlCuMn-A, AlCuMn-B, and AlCuMn-C. They were placed in a vacuum heat treatment furnace and subjected to different aging treatments under an argon atmosphere. After cooling to room temperature, the dried AlCuMn-A, AlCuMn-B, and AlCuMn-C were placed in a plasma treatment instrument for plasma treatment.

[0013] (2) Preparation of HfO2 nano suspension;

[0014] (3) Add AlCuMn-A, AlCuMn-B and AlCuMn-C to HfO2 nano suspension and stir in a water bath at 40~60℃ for 1.5~2.2h; after centrifugation, wash, dry, crush and sieve to obtain AlCuMn quasi-crystal particles.

[0015] Furthermore, in step (1), the mass ratio of AlCuMn-A, AlCuMn-B, and AlCuMn-C is 2:5:3.

[0016] Furthermore, in step (1), the aging temperatures of AlCuMn-A, AlCuMn-B, and AlCuMn-C are 400 °C, 500 °C, and 560 °C, respectively, and the aging times of AlCuMn-A, AlCuMn-B, and AlCuMn-C are 3h, 2.2h, and 2.5h, respectively.

[0017] Furthermore, in step (1), argon is used as the carrier gas, the plasma power is 125~150W, and the processing time is 3~5min.

[0018] Furthermore, step (2) specifically involves: weighing the nano HfO2 powder and deionized water to prepare an HfO2 suspension with a concentration of 5~10g / L; adding 0.1~0.3% polyethylene glycol PEG-6000 to the suspension, ultrasonically dispersing to form a uniformly dispersed nano suspension, and adjusting the pH value to 5~6.

[0019] Furthermore, in step (3), AlCuMn quasicrystalline particles with a particle size of 10~15μm and an HfO2 layer thickness of 80~100nm are obtained.

[0020] Furthermore, the performance of high-damping alloy steel components is as follows: specific damping capacity (SDC) is 39.3~39.8%, yield strength is 443~468 MPa, tensile strength is 762~794 MPa, and elongation is 36.9~37.9%.

[0021] To better achieve the objectives of this invention, this invention also provides a method for preparing a high-damping alloy material, comprising the following steps:

[0022] Step 1: Ball mill and mix the alloy raw material powder to obtain a mixed powder;

[0023] Step 2: The mixed powder is wrapped with cold-rolled steel strip and then formed and drawn into core wire with a diameter of 1-2 mm and a mixed powder filling rate of 10-30%.

[0024] Step 3: Using arc-fuse additive manufacturing process, high-damping alloy steel parts are prepared using flux-cored wire.

[0025] Step 4: Heat the high-damping alloy steel parts to 850~900℃ in a high-purity argon atmosphere and hold for 3.5~5 hours, then cool with water;

[0026] Step 5: Then, the high-damping alloy steel parts are subjected to hot isostatic pressing: held at 1100~1120 ℃ and 100~150MPa for 3~4.5h, and then cooled.

[0027] Step 6: Finally, temper the high-damping alloy steel parts and then cool them.

[0028] Furthermore, in step six, the high-damping alloy steel parts are subjected to low-temperature tempering treatment at 350~400℃, held at that temperature for 1.8~2.2 hours, and then cooled.

[0029] Compared with the prior art, the beneficial effects of this invention are as follows: the AlCuMn quasicrystalline particles of this invention are made from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are bonded to the surface with nano-HfO2. The high-damping alloy steel components exhibit the following properties: specific damping capacity (SDC) of 39.3-39.8%, yield strength of 443-468 MPa, tensile strength of 762-794 MPa, and elongation of 36.9-37.9%. This effectively achieves a synergistic improvement in both damping performance and mechanical strength. The high-damping alloy of this invention can be applied in the field of building steel processing, such as in the frame profiles of building doors and windows, possessing comprehensive properties of high strength, fire resistance, weather resistance, and high damping. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Example 1: A high-damping alloy material comprising the following raw materials by weight percentage: 2.9% nano-HfO2 modified AlCuMn quasicrystalline particles, C: 0.03%, Si: 0.8wt%, Mn: 3.5%, Al: 18.6%, Mo: 0.5%, Zn: 0.25%, Sc: 0.15%, Sb: 0.1%, V: 0.01%, RE: 0.02%, Nb: 0.008%, Ti: 0.021%, with the balance being Fe and unavoidable impurities;

[0032] The AlCuMn quasicrystalline particles are made from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are formed by bonding nano-HfO2 to the surface; the specific preparation method is as follows:

[0033] (1) The AlCuMn quasicrystalline particles were divided into three parts: AlCuMn-A, AlCuMn-B, and AlCuMn-C. They were placed in a vacuum heat treatment furnace and aged under an argon atmosphere. The mass ratio of AlCuMn-A, AlCuMn-B, and AlCuMn-C was 2:5:3. The aging temperatures of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 400 °C, 500 °C, and 560 °C, respectively. The aging times of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 3 h, 2.2 h, and 2.5 h, respectively. After cooling to room temperature, the dried AlCuMn-A, AlCuMn-B, and AlCuMn-C were placed in a plasma treatment instrument. Argon was used as the carrier gas (flow rate 20 sccm), the power was 125 W, and the treatment time was 5 min.

[0034] (2) Weigh out nano HfO2 powder (particle size 30nm) and deionized water to prepare HfO2 suspension with a concentration of 10g / L; add 0.1% (by weight) of polyethylene glycol PEG-6000 to the suspension, ultrasonically disperse for 30min to form a uniformly dispersed nano suspension, and adjust the pH value to 6.

[0035] (3) Add AlCuMn-A, AlCuMn-B and AlCuMn-C to HfO2 nano suspension, and control the solid-liquid ratio to 1:10 (weight-volume ratio); stir in a water bath at 60℃ for 1.5h; after centrifugation, wash, dry, crush and sieve to obtain AlCuMn quasicrystalline particles with a particle size of 15μm and an HfO2 layer thickness of 80nm.

[0036] Alloy raw material powder was ball-milled to obtain a mixed powder with a ball-to-powder ratio of 10:1, a rotation speed of 200 r / min, and a ball-milling time of 3 h. The mixed powder was wrapped with a 12 mm wide and 2 mm thick cold-rolled steel strip, and after forming and drawing, a core wire with a diameter of 1 mm and a mixed powder filling rate of 30% was obtained. High-damping alloy steel parts were prepared using the core wire through an electric arc wire additive manufacturing process. The high-damping alloy steel parts were heated to 850 °C and held for 5 h in a high-purity argon atmosphere, and then water-cooled. The high-damping alloy steel parts were then subjected to hot isostatic pressing: held at 1100 °C and 150 MPa for 3 h, and then cooled: 1100~800 °C at a cooling rate of 15 °C / min, 800~300 °C at a cooling rate of 30 °C / min, and below 300 °C in the furnace. Finally, the high-damping alloy steel parts were subjected to low-temperature tempering at 350 °C for 2.2 h, and then cooled.

[0037] The properties of this high-damping alloy steel component are as follows: specific damping capacity (SDC) of 39.6%, yield strength of 468 MPa, tensile strength of 775 MPa, and elongation of 36.9%. The yield strength at 600℃ is 329 MPa, and the annual corrosion rate in the salt spray test is 1.102 mm / a.

[0038] Example 2: A high-damping alloy material comprising the following raw materials by weight percentage: 4.8% nano-HfO2 modified AlCuMn quasicrystalline particles, C: 0.01%, Si: 0.5wt%, Mn: 4.2%, Al: 16.2%, Mo: 1.3%, Zn: 0.1%, Sc: 0.27%, Sb: 0.05%, V: 0.03%, RE: 0.008%, Nb: 0.015%, Ti: 0.012%, with the balance being Fe and unavoidable impurities;

[0039] The AlCuMn quasicrystalline particles are made from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are formed by bonding nano-HfO2 to the surface; the specific preparation method is as follows:

[0040] (1) The AlCuMn quasicrystalline particles were divided into three parts: AlCuMn-A, AlCuMn-B, and AlCuMn-C. They were placed in a vacuum heat treatment furnace and aged under an argon atmosphere. The mass ratio of AlCuMn-A, AlCuMn-B, and AlCuMn-C was 2:5:3. The aging temperatures of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 400 °C, 500 °C, and 560 °C, respectively. The aging times of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 3 h, 2.2 h, and 2.5 h, respectively. After cooling to room temperature, the dried AlCuMn-A, AlCuMn-B, and AlCuMn-C were placed in a plasma treatment instrument. Argon was used as the carrier gas (flow rate 20 sccm), the power was 150 W, and the treatment time was 3 min.

[0041] (2) Weigh out nano HfO2 powder (particle size 50nm) and deionized water to prepare HfO2 suspension with a concentration of 5g / L; add 0.3% (by weight) of polyethylene glycol PEG-6000 to the suspension, ultrasonically disperse for 30min to form a uniformly dispersed nano suspension, and adjust the pH value to 5.

[0042] (3) Add AlCuMn-A, AlCuMn-B and AlCuMn-C to HfO2 nano suspension, and control the solid-liquid ratio to 1:15 (weight-volume ratio); stir in a water bath at 40℃ for 2.2h; after centrifugation, wash, dry, crush and sieve to obtain AlCuMn quasicrystalline particles with a particle size of 10μm and an HfO2 layer thickness of 100nm.

[0043] Alloy raw material powder was ball-milled to obtain a mixed powder with a ball-to-powder ratio of 10:1, a rotation speed of 250 r / min, and a ball-milling time of 2 h. The mixed powder was wrapped with a 12 mm wide and 2 mm thick cold-rolled steel strip, and after forming and drawing, a core wire with a diameter of 2 mm and a mixed powder filling rate of 10% was obtained. High-damping alloy steel parts were prepared using the core wire through an arc-fused-wire additive manufacturing process. The high-damping alloy steel parts were heated to 900 °C and held for 3.5 h in a high-purity argon atmosphere, and then water-cooled. The high-damping alloy steel parts were then subjected to hot isostatic pressing: held at 1120 °C and 100 MPa for 4.5 h, and then cooled: 1120~800 °C at a cooling rate of 20 °C / min, 800~300 °C at a cooling rate of 25 °C / min, and below 300 °C in the furnace. Finally, the high-damping alloy steel parts were subjected to low-temperature tempering at 400 °C for 1.8 h, and then cooled.

[0044] The high-damping alloy steel component exhibits the following properties: specific damping capacity (SDC) of 39.3%, yield strength of 443 MPa, tensile strength of 794 MPa, and elongation of 37.4%. At 600℃, the yield strength is 315 MPa. Salt spray test results show an annual corrosion rate of 1.131 mm / a.

[0045] Example 3: A high-damping alloy material comprising the following raw materials by weight percentage: 3.6% nano-HfO2 modified AlCuMn quasicrystalline particles, C: 0.02%, Si: 0.6wt%, Mn: 3.8%, Al: 17.4%, Mo: 0.8%, Zn: 0.15%, Sc: 0.22%, Sb: 0.07%, V: 0.02%, RE: 0.015%, Nb: 0.01%, Ti: 0.016%, with the balance being Fe and unavoidable impurities;

[0046] The AlCuMn quasicrystalline particles are made from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are formed by bonding nano-HfO2 to the surface; the specific preparation method is as follows:

[0047] (1) The AlCuMn quasicrystalline particles were divided into three parts: AlCuMn-A, AlCuMn-B, and AlCuMn-C. They were placed in a vacuum heat treatment furnace and aged under an argon atmosphere. The mass ratio of AlCuMn-A, AlCuMn-B, and AlCuMn-C was 2:5:3. The aging temperatures of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 400 °C, 500 °C, and 560 °C, respectively. The aging times of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 3 h, 2.2 h, and 2.5 h, respectively. After cooling to room temperature, the dried AlCuMn-A, AlCuMn-B, and AlCuMn-C were placed in a plasma treatment instrument. Argon was used as the carrier gas (flow rate 20 sccm), the power was 135 W, and the treatment time was 4 min.

[0048] (2) Weigh out nano HfO2 powder (particle size 40nm) and deionized water to prepare HfO2 suspension with a concentration of 8g / L; add 0.2% (by weight) of polyethylene glycol PEG-6000 to the suspension, ultrasonically disperse for 30min to form a uniformly dispersed nano suspension, and adjust the pH value to 5.5.

[0049] (3) Add AlCuMn-A, AlCuMn-B and AlCuMn-C to HfO2 nano suspension, and control the solid-liquid ratio to 1:10~1:15 (weight-volume ratio); stir in a water bath at 55℃ for 2h; after centrifugation, wash, dry, crush and sieve to obtain AlCuMn quasicrystalline particles with a particle size of 12μm and an HfO2 layer thickness of 95nm.

[0050] Alloy raw material powder was ball-milled to obtain a mixed powder with a ball-to-powder ratio of 10:1, a rotation speed of 220 r / min, and a ball-milling time of 2.5 h. The mixed powder was wrapped with a 12 mm wide and 2 mm thick cold-rolled steel strip, and after forming and drawing, a core wire with a diameter of 1.8 mm and a mixed powder filling rate of 22% was obtained. High-damping alloy steel parts were prepared using the core wire through an arc-fused-wire additive manufacturing process. The high-damping alloy steel parts were heated to 880 °C and held for 4 h in a high-purity argon atmosphere, and then water-cooled. The high-damping alloy steel parts were then subjected to hot isostatic pressing: held at 1110 °C and 135 MPa for 3.5 h, and then cooled: 1110~800 °C at a cooling rate of 18 °C / min, 800~300 °C at a cooling rate of 26 °C / min, and below 300 °C in the furnace. Finally, the high-damping alloy steel parts were subjected to low-temperature tempering at 380 °C for 2 h, and then cooled.

[0051] The high-damping alloy steel component exhibits the following properties: specific damping capacity (SDC) of 39.8%, yield strength of 451 MPa, tensile strength of 762 MPa, and elongation of 37.9%. At 600℃, the yield strength is 318 MPa. Salt spray test results show an annual corrosion rate of 1.117 mm / a.

[0052] Comparative Example 1: Compared with Example 3, step (1) is different:

[0053] (1) The AlCuMn quasi-crystal particles were placed in a vacuum heat treatment furnace and aged under an argon atmosphere. The aging treatment temperature was 500 °C and the aging treatment time was 3h. After cooling to room temperature, the dried AlCuMn was placed in a plasma treatment instrument with argon as the carrier gas (flow rate 20 sccm) and power 150W for 3min.

[0054] The alloy steel component exhibits the following properties: specific damping capacity (SDC) of 28.9%, yield strength of 426 MPa, tensile strength of 717 MPa, and elongation of 32.3%. At 600℃, the yield strength is 299 MPa. Salt spray test results show an annual corrosion rate of 1.132 mm / a.

[0055] Comparative Example 2: Compared with Example 3, the nano-HfO2 modified AlCuMn quasicrystalline particles were replaced with AlCuMn quasicrystalline particles.

[0056] The alloy steel component exhibits the following properties: specific damping capacity (SDC) of 31.6%, yield strength of 434 MPa, tensile strength of 748 MPa, and elongation of 30.5%. At 600℃, the yield strength is 301 MPa. Salt spray test results show an annual corrosion rate of 1.158 mm / a.

[0057] The high-damping alloy of this invention can be applied to components such as frame profiles for building doors and windows, and has comprehensive properties of high strength, fire resistance, weather resistance, and high damping.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-damping alloy material, characterized in that, The raw materials include the following weight percentages: nano-HfO2 modified AlCuMn quasicrystalline particles 2.9%~4.8%, C: 0.01%~0.03%, Si≤0.8%, Mn: 3.5%~4.2%, Al: 16.2%~18.6%, Mo: 0.5%~1.3%, Zn: 0.1%~0.25%, Sc: 0.15%~0.27%, Sb: 0.05%~0.1%, V: 0.01%~0.03%, RE: 0.008%~0.02%, Nb: 0.008%~0.015%, Ti: 0.012%~0.021%, with the balance being Fe and unavoidable impurities; And it meets the following conditions: 3.7 ≤ nano HfO2 modified AlCuMn quasicrystalline particles / Mo ≤ 5.8; 0.17% ≤ Sc + RE ≤ 0.28%; 3.6%≤1.0×nano HfO2 modified AlCuMn quasicrystalline particles +0.1×Mn +0.3×Mo +0.5×Sb +0.8×Sc +0.4×V +0.4×Nb +0.6×Ti≤5.9%; The nano-HfO2 modified AlCuMn quasicrystalline particles are made from Al that has undergone different aging treatments. 65 Cu 20 Mn 15 Quasicrystalline particles are formed by bonding nano-HfO2 to the surface; The specific preparation method of nano-HfO2 modified AlCuMn quasicrystalline particles is as follows: (1) AlCuMn quasicrystalline particles were divided into three parts: AlCuMn-A, AlCuMn-B, and AlCuMn-C. They were placed in vacuum heat treatment furnaces and subjected to different aging treatments under an argon atmosphere. The mass ratio of AlCuMn-A, AlCuMn-B, and AlCuMn-C was 2:5:

3. The aging treatment temperatures of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 400℃, 500℃, and 560℃, respectively. The aging treatment times of AlCuMn-A, AlCuMn-B, and AlCuMn-C were 3h, 2.2h, and 2.5h, respectively. After cooling to room temperature, the dried AlCuMn-A, AlCuMn-B, and AlCuMn-C were placed in a plasma treatment instrument for plasma treatment. (2) Preparation of HfO2 nano suspension: Weigh the nano HfO2 powder and deionized water to prepare an HfO2 suspension with a concentration of 5~10g / L; add 0.1~0.3% polyethylene glycol PEG-6000 to the suspension, and ultrasonically disperse to form a uniformly dispersed nano suspension, and adjust the pH value to 5~6. (3) Add AlCuMn-A, AlCuMn-B and AlCuMn-C to HfO2 nano suspension and stir in a water bath at 40~60℃ for 1.5~2.2h; after centrifugation, wash, dry, crush and sieve to obtain nano HfO2 modified AlCuMn quasi-crystal particles with a particle size of 10~15μm and an HfO2 layer thickness of 80~100nm.

2. The high-damping alloy material according to claim 1, characterized in that, In step (1), argon is used as the carrier gas, the plasma power is 125~150W, and the processing time is 3~5min.

3. A method for preparing a high-damping alloy material according to claim 1 or 2, characterized in that, Includes the following steps: Step 1: Ball mill and mix the alloy raw material powder to obtain a mixed powder; Step 2: The mixed powder is wrapped with cold-rolled steel strip and then formed and drawn into core wire with a diameter of 1-2 mm and a mixed powder filling rate of 10-30%. Step 3: Using arc-fuse additive manufacturing process, high-damping alloy steel parts are prepared using flux-cored wire. Step 4: Heat the high-damping alloy steel parts to 850~900℃ in a high-purity argon atmosphere and hold for 3.5~5 hours, then cool with water; Step 5: Then, the high-damping alloy steel parts are subjected to hot isostatic pressing: held at 1100~1120 ℃ and 100~150 MPa for 3~4.5 hours, and then cooled. Step 6: Finally, temper the high-damping alloy steel parts and then cool them.

4. The method for preparing the high-damping alloy material according to claim 3, characterized in that, In step six, the high-damping alloy steel parts are subjected to low-temperature tempering treatment at 350~400℃, held at that temperature for 1.8~2.2h, and then cooled.

5. The method for preparing the high-damping alloy material according to claim 3, characterized in that, Performance of high-damping alloy steel components: specific damping capacity (SDC) is 39.3~39.8%, yield strength is 443~468MPa, tensile strength is 762~794MPa, and elongation is 36.9~37.9%.