HIGH-STRENGTH HIGH-TOUGHNESS AND WEAR-RESISTANT COMPOSITE STEEL PLATE AND MANUFACTURING METHOD THEREFOR

Abstract

Disclosed is a high-strength high-toughness and wear-resistant composite steel plate, comprising a substrate layer and a composite layer of which a single side or double sides are composited on the substrate layer; the substrate layer is a carbon steel layer; the composite layer is a ultra-high manganese steel layer, and a content of Mn element in the composite layer is 16.0025.00 wt. %. Further disclosed is a manufacturing method for the high-strength high-toughness and wear-resistant composite steel plate, comprising: (1) making a substrate layer plate blank and a composite layer plate blank; (2) assembling; (3) heating: the heating temperature is 11501250 C. and the heat preservation is performed for 13 hours; (4) composite rolling: the starting rolling temperature is 11201220 C.; the finishing rolling temperature is 10501200 C.; and the reduction rate is controlled to be more than or equal to 50%; and (5) cooling after rolling. With high strength and hardness, high wear resistance and high toughness, the high-strength high-toughness and wear-resistant composite steel plate has excellent comprehensive performance.

Claims

1. A high-strength, high-toughness and wear-resistant composite steel plate, comprising a substrate layer and a compounding layer compounded on one or both surfaces of the substrate layer, wherein the substrate layer is a carbon steel layer, and the compounding layer is an ultra-high manganese steel layer, wherein the composite layer has a Mn element content of 16.00-25.00 wt %.

2. The high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the substrate layer comprises the following chemical elements in mass percentage: C: 0.10-0.25 wt. %; Si: 0.10-1.00 wt. %; Mn: 0.40-2.00 wt. %; Cr: 0.01-2.00 wt. %; Mo: 0.01-1.00 wt. %; Ni: 0.01-2.00 wt. %; Nb: 0.001-0.080 wt. %; B: 0.0005-0.0040 wt. %; Al: 0.010-0.080 wt. %; and the balance of Fe and other unavoidable impurities.

3. The high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the substrate layer further comprises at least one of the following chemical elements: 0<23 0.080 wt. % and 0<Ti0.060 wt. %.

4. The high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the chemical elements of the substrate layer further meet at least one of 0.20%(Cr/5+Mn/6+50B)0.55%, 0.10%(Mo/3+Ni/5+2Nb)0.42% and 0.02%(Al+Ti)0.12%.

5. The high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the substrate layer comprises a microstructure of martensite +residual austenite.

6. The high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the substrate layer has a tensile strength of 1200 MPa, a yield strength of 1000 MPa, an elongation of 14%, a Brinell hardness of 400 HB, and a Charpy V-notch longitudinal impact energy at 40 C. of 60 J.

7. The high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the compounding layer comprises the following chemical elements in mass percentage: C: 1.30-1.80 wt. %; Si: 0.20-1.50 wt. %; Mn: 16.00-25.00 wt. %; Cr: 0.01-3.00 wt. %; Mo: 0.01-1.00 wt. %; Ti: 13.060%, Al: 0.010-0.080 wt. %; and the balance of Fe and other unavoidable impurities.

8. The high-strength, high-toughness and wear-resistant composite steel plate of claim 7, wherein the compounding layer comprises a microstructure of austenite.

9. The high-strength, high-toughness and wear-resistant composite steel plate of claim 7, wherein the compounding layer has a tensile strength of 500 MPa, an elongation of 12%, a Brinell hardness of 170 HB, and a Charpy U-notch longitudinal impact energy at 40 C. of 40 J.

10. A method for manufacturing the high-strength, high-toughness and wear-resistant composite steel plate of claim 1, wherein the method comprises the following steps: (1) Preparing a substrate layer slab and a compounding layer slab; (2) Assembling the slabs; (3) Heating: heating temperature: 1150-1250 C., holding time: 1-3 hours; (4) Compounding rolling: rolling-start temperature: 1120-1220 C., rolling-end temperature: 1050-1200 C., reduction rate being controlled at 50%, and (5) Post-rolling cooling.

11. The method for manufacturing the high-strength, high-toughness and wear-resistant composite steel plate according to claim 10, wherein water cooling is used in step (5) to cool the composite steel plate to room temperature 300 C. at a cooling rate of 10 C/s.

12. The method for manufacturing the high-strength, high-toughness and wear-resistant composite steel plate according to claim 10, wherein air cooling is used in step (5) to cool the composite steel plate to room temperature, followed by step (6): offline quenching.

13. The method for manufacturing the high-strength, high-toughness and wear-resistant composite steel plate according to claim 12, wherein, in step (6), quenching temperature is 1050-1100 C., and holding time is (1.5t) min, where t represents plate thickness in mm.

14. The high-strength, high-toughness and wear-resistant composite steel plate of claim 2, wherein the compounding layer comprises the following chemical elements in mass percentage: C: 1.30-1.80 wt. %, Si: 0.20-1.50 wt. %, Mn: 16.00-25.00 wt. %, Cr: 0.01-3.00 wt. %, Mo: 0.01-1.00 wt. %, Ti: 0.060%, Al: 0.010-0.080 wt. %, and the balance of Fe and other unavoidable impurities.

15. The high-strength, high-toughness and wear-resistant composite steel plate of claim 3, wherein the compounding layer comprises the following chemical elements in mass percentage: C: 1.30-1.80 wt. %, Si: 0.20-1.50 wt. %, Mn: 16.00-25.00 wt. %, Cr: 0.01-3.00 wt. %, Mo: 0.01-1.00 wt. %, Ti: 0.060%, Al: 0.010-0.080 wt. %, and the balance of Fe and other unavoidable impurities.

16. The high-strength, high-toughness and wear-resistant composite steel plate of claim 4, wherein the compounding layer comprises the following chemical elements in mass percentage: C: 1.30-1.80 wt. %, Si: 0.20-1.50 wt. %, Mn: 16.00-25.00 wt. %, Cr: 0.01-3.00 wt. %, Mo: 0.01-1.00 wt. %, Ti: 0.060%, Al: 0.010-0.080 wt. %, and the balance of Fe and other unavoidable impurities.

17. The high-strength, high-toughness and wear-resistant composite steel plate of claim 5, wherein the compounding layer comprises the following chemical elements in mass percentage: C: 1.30-1.80 wt. %, Si: 0.20-1.50 wt. %, Mn: 16.00-25.00 wt. %, Cr: 0.01-3.00 wt. %, Mo: 0.01-1.00 wt. %, Ti: 0.060%, Al: 0.010-0.080 wt. %, and the balance of Fe and other unavoidable impurities.

18. The high-strength, high-toughness and wear-resistant composite steel plate of claim 6, wherein the compounding layer comprises the following chemical elements in mass percentage: C: 1.30-1.80 wt. %, Si: 0.20-1.50 wt. %, Mn: 16.00-25.00 wt. %, Cr: 0.01-3.00 wt. %, Mo: 0.01-1.00 wt. %, Ti: 0.060%, Al: 0.010-0.080 wt. %, and the balance of Fe and other unavoidable impurities.

19. The high-strength, high-toughness and wear-resistant composite steel plate of claim 14, wherein the compounding layer comprises a microstructure of austenite, and the compounding layer has a tensile strength of 500 MPa, an elongation of 12%, a Brinell hardness of 170 HB, and a Charpy U-notch longitudinal impact energy at 40 C. of 40 J.

20. The high-strength, high-toughness and wear-resistant composite steel plate of claim 18, wherein the compounding layer comprises a microstructure of austenite, and the compounding layer has a tensile strength of 500 MPa, an elongation of 12%, a Brinell hardness of 170 HB, and a Charpy U-notch longitudinal impact energy at 40 C. of 40 J.

Description

DETAILED DESCRIPTION

[0064] The high-strength, high-toughness and wear-resistant composite steel plate and the method for manufacturing the same according to the disclosure will be further explained and illustrated with reference to the specific examples. Nonetheless, the explanation and illustration are not intended to unduly limit the technical solution of the disclosure.

EXAMPLES 1-10

[0065] Table 1-1 and Table 1-2 list the mass percentage of each chemical element in the substrate layers in the high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10.

TABLE-US-00001 TABLE 1-1 (wt %, the balance is Fe and other unavoidable impurities except for S, P, N, H and O) C Si Mn P S Cr Mo Ni Micro structure Ex. 1 0.1 0.76 1.75 0.013 0.008 0.25 0.36 0.49 Martensite + residual austenite Ex. 2 0.13 0.55 1.62 0.011 0.006 0.49 0.21 0.01 Martensite + residual austenite Ex. 3 0.15 0.27 1.45 0.01 0.003 0.33 0.26 0.01 Martensite + residual austenite Ex. 4 0.17 0.45 1.52 0.012 0.004 0.26 0.33 0.01 Martensite + residual austenite Ex. 5 0.19 0.33 1.26 0.008 0.005 1 0.45 0.01 Martensite + residual austenite Ex. 6 0.2 0.19 1.38 0.01 0.003 0.01 0.29 0.01 Martensite + residual austenite Ex. 7 0.21 0.42 1.13 0.011 0.002 0.55 0.53 0.01 Martensite + residual austenite Ex. 8 0.23 0.26 1.28 0.009 0.005 0.46 0.01 0.88 Martensite + residual austenite Ex. 9 0.24 0.13 1.05 0.01 0.004 0.66 0.32 0.01 Martensite + residual austenite Ex. 10 0.25 0.35 0.82 0.008 0.003 0.38 0.29 1.21 Martensite + residual austenite

TABLE-US-00002 TABLE 1-2 (wt %, the balance is Fe and other unavoidable impurities except for S, P, N, H and O) Cr/5 + Mo/3+ Nb V Ti Al B N O H Mn/6 + 50B Ni/5 + 2Nb Al + Ti Ex. 1 0.065 0.075 0.015 0.056 0.003 0.0053 0.0042 0.0003 0.49 0.35 0.07 Ex. 2 0.025 0.001 0.021 0.044 0.0015 0.0042 0.0035 0.0003 0.44 0.12 0.07 Ex. 3 0.016 0.001 0.008 0.020 0.0011 0.0055 0.00638 0.0002 0.36 0.12 0.03 Ex. 4 0.037 0.001 0.001 0.051 0.0017 0.0062 0.0038 0.0004 0.39 0.19 0.05 Ex. 5 0.001 0.001 0.031 0.049 0.002 0.0031 0.0021 0.0002 0.51 0.15 0.08 Ex. 6 0.028 0.001 0.020 0.035 0.0005 0.0051 0.0035 0.0002 0.26 0.15 0.06 Ex. 7 0.001 0.052 0.015 0.065 0.0016 0.0038 0.0041 0.0002 0.38 0.18 0.08 Ex. 8 0.001 0.001 0.049 0.052 0.0013 0.0041 0.0025 0.0003 0.37 0.18 0.10 Ex. 9 0.033 0.001 0.010 0.041 0.0018 0.0050 0.0037 0.0003 0.40 0.17 0.05 Ex. 10 0.019 0.001 0.016 0.039 0.002 0.0029 0.0021 0.0002 0.31 0.38 0.06

[0066] Table 2 lists the mass percentage of each chemical element in the compounding layers in the high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10.

TABLE-US-00003 TABLE 2 (wt %, the balance is Fe and other unavoidable impurities except for S and P) C Si Mn P S Cr Mo Ti Al Microstructure Ex. 1 1.3 0.33 22 0.012 0.002 1.35 0.01 0.001 0.033 Austenite Ex. 2 1.35 0.36 21.5 0.011 0.003 2.5 0.53 0.012 0.031 Austenite Ex. 3 1.4 0.45 16 0.008 0.006 1.88 0.21 0.001 0.015 Austenite Ex. 4 1.45 0.62 25 0.012 0.005 2.3 0.01 0.001 0.025 Austenite Ex. 5 1.5 0.38 22 0.011 0.003 1.2 0.15 0.011 0.033 Austenite Ex. 6 1.55 0.25 22 0.009 0.007 1.0 0.01 0.001 0.041 Austenite Ex. 7 1.6 0.41 24.5 0.009 0.003 1.30 0.27 0.015 0.021 Austenite Ex. 8 1.65 0.33 23 0.012 0.005 1.38 0.01 0.001 0.041 Austenite Ex. 9 1.7 0.22 21 0.009 0.003 2.0 0.21 0.001 0.011 Austenite Ex. 10 1.8 0.55 18 0.011 0.005 0.93 0.01 0.01 0.056 Austenite

[0067] The high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10 were prepared using the following steps:

[0068] (1) Smelting according to Tables 1-1, 1-2 and 2 to obtain the substrate layer slabs and compounding layer slabs;

[0069] (2) Assembling the slabs;

[0070] (3) Heating: heating temperature: 1150-1250 C., holding time: 1-3 hours;

[0071] (4) Compounding rolling: rolling-start temperature: 1120-1220 C., rolling-end temperature: 1050-1200 C., reduction rate being controlled at 50%; and

[0072] (5) Post-rolling cooling.

[0073] It should be noted that when water cooling was used in step (5), the plates were cooled to room temperature 300 C. at a cooling rate of 10 C./s; if the plates were cooled by air cooling to room temperature in step (5), it should be followed by step (6): offline quenching, wherein the quenching temperature was 1050-1100 C., and the holding time was (1.5t) min, where t represented the thickness of the steel plate in mm.

[0074] Table 3 lists the specific process parameters in each step for the high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10.

TABLE-US-00004 TABLE 3 Step (5) Step (6) Step (3) Step (4) End Quenching Steel Heating Holding Rolling-start Rolling-end Reduction Cooling Cooling Quenching holding plate temperature time temperature temperature rate Cooling rate Temperature Temperature time thickness ( C.) (h) ( C.) ( C.) (%) mode ( C./s) ( C.) ( C.) (min) (mm) Ex. 1 1170 2 1150 1100 82 Air / Room 1080 22.5 15 cooling Temperature Ex. 2 1150 2.5 1130 1050 66 Air / Room 1100 30 20 cooling Temperature Ex. 3 1230 2 1200 1150 73 Water 28 255 / / 20 cooling Ex. 4 1250 2 1200 1130 76 Water 35 193 / / 30 cooling Ex. 5 1230 2 1200 1120 69 Water 40 235 / / 20 cooling Ex. 6 1170 2 1150 1100 77 Air / Room 1080 24 16 cooling Temperature Ex. 7 1200 2.5 1180 1115 71 Air / Room 1060 34.5 23 cooling Temperature Ex. 8 1210 2.5 1190 1110 82 Water 37 175 / / 15 cooling Ex. 9 1230 3 1210 1120 83 Water 29 Room / / 22 cooling Temperature Ex. 10 1250 3 1220 1135 60 Water 36 256 / / 18 cooling

[0075] The high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10 were sampled for tests of mechanical properties. The test results are listed in Table 4 and Table 5.

[0076] Table 4 lists the mechanical property parameters of the substrate layers in the high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10.

TABLE-US-00005 TABLE 4 Charpy V-notch Lateral tensile properties longitudinal impact Hardness Yield strength Tensile strength Elongation energy at 40 C. (HBW) (MPa) (MPa) (%) (J) Ex. 1 412 1005 1265 15 82 Ex. 2 416 1065 1295 15 78 Ex. 3 415 1065 1280 15 73 Ex. 4 416 1070 1300 15 71 Ex. 5 417 1075 1280 15 72 Ex. 6 425 1075 1320 15 78 Ex. 7 427 1095 1325 15 79 Ex. 8 430 1105 1350 14 71 Ex. 9 452 1120 1450 14 72 Ex. 10 431 1100 1355 14 76

[0077] Table 5 lists the mechanical property parameters of the compounding layers in the high-strength, high-toughness and wear-resistant composite steel plates of Examples 1-10.

TABLE-US-00006 TABLE 5 Charpy U-notch Lateral tensile properties longitudinal impact Hardness Yield strength Tensile strength Elongation energy at 40 C. (HBW) (MPa) (MPa) (%) (J) Ex. 1 255 575 800 13 85 Ex. 2 265 560 810 13 80 Ex. 3 285 585 825 13 76 Ex. 4 280 580 835 13 75 Ex. 5 300 600 835 12 72 Ex. 6 310 625 845 12 66 Ex. 7 305 600 845 12 65 Ex. 8 315 610 870 12 58 Ex. 9 310 615 860 12 60 Ex. 10 320 605 875 12 66

[0078] As shown by Tables 4 and 5, in the high-strength, high-toughness and wear-resistant composite steel plates of the various Examples according to the present disclosure, the substrate layer has high strength, high hardness, and high toughness, wherein the mechanical properties of the substrate layer include: tensile strength 1200 MPa, yield strength 1000 MPa, elongation 14%, Brinell hardness 400 HB, and Charpy V-notch longitudinal impact energy at 40 C. 60 J; and the mechanical properties of the compounding layer include: hardness 170 HB, tensile strength 500 MPa, elongation 12%, and Charpy U-notch longitudinal impact energy at 40 C.40 J.

[0079] It's to be noted that the prior art portions in the protection scope of the present disclosure are not limited to the examples set forth in the present application file. All the prior art contents not contradictory to the technical solution of the present disclosure, including but not limited to prior patent literature, prior publications, prior public uses and the like, may all be incorporated into the protection scope of the present disclosure.

[0080] In addition, the ways in which the various technical features of the present disclosure are combined are not limited to the ways recited in the claims of the present disclosure or the ways described in the specific examples. All the technical features recited in the present disclosure may be combined or integrated freely in any manner, unless contradictions are resulted.

[0081] It should also be noted that the Examples set forth above are only specific examples according to the present disclosure. Obviously, the present disclosure is not limited to the above Examples. Similar variations or modifications made thereto can be directly derived or easily contemplated from the present disclosure by those skilled in the art. They all fall in the protection scope of the present disclosure.