• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    -25 A quenched steel plate is disclosed. The plate has a thickness of at least 6 mm, a martensite or tempered martensite 5 microstructure, and the following composition, in wt%: C: at least 0.3 Mn: < 0.8 Ti: < 0.08 Si: < 0.8 10 Ni: < 2.0 Cr: < 1.5 Mo: < 0.5 Cu: < 0.3 Al: < 0.12 15 Ca: < 0.005 B: < 0.005 P: < 0.040 V: < 0.10 S: < 0.02 20 Fe: balance and incidental impurities 42519221 (GHMatters) P91313.AU.1 12/04/13
    公开号:AU2013204206A1
    申请号:U2013204206
    申请日:2013-04-12
    公开日:2014-05-08
    发明作者:Jim Williams
    申请人:BlueScope Steel Ltd；
    IPC主号:C22C38-00
    专利说明:
    -1 STEEL PLATE The present invention relates to wear resistant 5 quenched and tempered steel plate that is suitable for use in the mining and the construction industries in applications including wear liners, such as dump truck wear liners, chutes, earth moving buckets, cutting edges, and ground engaging tools. 10 Important properties for steel plate for the above applications include abrasion resistance, tensile strength, toughness, formability, and weldability. The present invention provides an alternative steel 15 plate to steel plate that is currently available in Australia that has an advantageous combination of the properties of abrasion resistance, tensile strength, toughness, formability and weldability. 20 The present invention is based on a realization from extensive research and development work that the use of low Mn concentrations (and low Carbon Equivalent (CET) values) is a basis for a quenched steel plate that has an advantageous combination of the properties of abrasion resistance, tensile 25 strength, toughness, formability and weldability. According to the present invention there is provided a quenched steel plate having a thickness of at least 6 mm, a martensite or tempered martensite microstructure, the following 30 composition, in wt%: 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -2 C: at least 0.3 Mn: < 0.8 Ti: < 0.08 5 Si: < 0.8 Ni: < 2.0 Cr: < 1.5 Mo: < 0.5 Cu: < 0.3 10 Al: < 0.12 Ca: < 0.005 B: < 0.005 P: < 0.040 V: < 0.10 15 S: < 0.02 Fe: balance and incidental impurities. The term "incidental impurities" is understood herein to mean impurities that are the result of the steelmaking 20 process and the feed materials used in the steelmaking process and are not deliberate additions to the composition and are not already in the list of elements. Sn is one such element. The quenched steel plate may have any suitable a 25 Carbon Equivalent (CET) value. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -3 The quenched steel plate may have a CET value not exceeding 0.55 for plate thicknesses in the range 20 <t<= 60mm. The quenched steel plate may have a CET value not 5 exceeding 0.53 for plate thicknesses in the range 20 <t<= 60mm. The quenched steel plate may have a CET value not exceeding 0.51 for plate thicknesses in the range of t <= 20mm. 10 The quenched steel plate may have a CET value not exceeding 0.49 for plate thicknesses in the range of t <= 20mm. CET provides a measure of the weldability of the steel and is determined as follows: 15 CET (in wt%) = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40 In any given situation, the selection of the steel chemistry of the quenched steel plate includes consideration of 20 achieving required properties, such as any one or more of abrasion resistance, tensile strength, toughness, formability, and weldability, for an end use application on a cost effective basis. 25 The composition of the quenched steel plate may include less than 0.55 wt.% C. The composition may include less than 0.5 wt.% C. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -4 The composition may include less than 0.4 wt.% C. The composition may include greater than 0.32 wt.% C. 5 The composition may include greater than 0.35 wt.% C. The composition may include 0.32-0.5 wt.% C. 10 The composition may include 0.32-0.38 wt.% C. The composition may include less than 0.7 wt.% Mn. The composition may include less than 0.6 wt.% Mn. 15 The composition may include less than 0.4 wt.% Mn. The composition may include less than 0.3 wt.% Mn. 20 The composition may include at least 0.15 wt.% Mn. The composition may include greater than 0.55 wt.% Mn. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -5 The composition may include at least 0.001 wt.% Ti. The composition may include at least 0.01 wt.% Ti. 5 The composition may include 0.01-0.035 wt.% Ti. The composition may include less than 0.035 wt.% Ti. The composition may include less than 0.6 wt.% Ni. 10 The composition may include less than 0.5 wt.% Ni. The composition may include less than 0.2 wt.% Ni. 15 The composition may include greater than 0.03 wt.% Ni. The composition may include less than 1.3 wt.% Cr. 20 The composition may include less than 1.0 wt.% Cr. The composition may include greater than 0.2 wt.% Cr. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -6 The composition may include less than 0.3 wt.% Mo. 5 The composition may include greater than 0.05 wt.% Mo. The composition may include less than 0.1 wt.% Al. 10 The composition may include less than 0.07 wt.% Al. The composition may include less than 15 0.06 wt.% Al. The composition may include greater than 0.01 wt.% Al. 20 The composition may include less than 0.005 wt.% Ca. The composition may include less than 0.0015 wt% Ca. According to the present invention there is also 25 provided a product made from the above-described steel plate. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -7 The product may include, by way of example, wear liners such as dump truck wear liners. 5 According to the present invention there is also provided equipment for the mining and the construction industries that includes the above-described steel plate. The equipment may include any one or more of dump 10 trucks, chutes, earth moving buckets, and ground engaging tools. The applicant has found that the above-described quenched steel plate has comparable or superior toughness, hardness, weldability, and formability to steel plate available 15 in Australia. The toughness of the above-described steel plate, after quenching and as measured in a Charpy impact test in a longitudinal direction with a 10 mm x 10 mm test sample, may be 20 typically 15J at a test temperature of -40*C. The toughness of the above-described steel plate, after quenching and as measured in a Charpy impact test in a transverse direction with a 10 mm x 10 mm test sample, may be 25 typically 10J at a test temperature of -40*C. The hardness of the above-described steel plate after quenching may be at least 450 Brinell through the thickness of the plate. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -8 The hardness of the above-described steel plate after quenching may be at least 500 Brinell through the thickness of the plate. 5 The hardness of the above-described steel plate after quenching may be at least 570 Brinell through the thickness of the plate. 10 The hardness of the above-described steel plate after quenching may vary through the thickness of the plate, with the hardness at the surface of the plate being at least 570 Brinell. The hardness of the above-described steel plate after 15 quenching may be at least 570-630 Brinell through the thickness of the plate. The Proof Stress of the above-described steel plate after quenching may be at least 1400 MPa. 20 The Proof Stress of the above-described steel plate after quenching may be at least 1450 MPa. The tensile strength of the above-described steel 25 plate after quenching may be at least 1800 MPa. The tensile strength of the above-described steel plate after quenching may be at least 1900 MPa. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -9 The thickness of the above-described steel plate may be at least 6 mm. 5 The thickness of the above-described steel plate may be 6-60 mm. The thickness of the above-described steel plate may be 6-50 mm. 10 The thickness of the above-described steel plate may be 6-25 mm. The above-described quenched steel plate may be 15 manufactured by the following process: (a) continuously casting slabs of steel having a required composition; 20 (b) hot rolling the slabs to form pattern plate having a required thickness, typically 6-60 mm or coil plate having a required thickness, typically 6-8 mm; (c) treating the hot rolled steel plate by: 25 (i) heating the steel plate to the austenising temperature range and holding the steel plate in 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -10 the temperature range for a predetermined time; and (ii) quenching the steel plate, typically with water 5 sprays. The objective of the above-described heat treatment step (c) is to form a martensite or tempered martensite microstructure. 10 Treatment step (c) may include a further step of tempering the quenched steel plate as required at a predetermined temperature. 15 The tempering temperature may be at least 150*C. The tempering temperature may be in a range of 150 200 *C. 20 In general terms, one quenched and tempered steel plate in accordance with the present invention is made from steel comprising 0.38-0.42% C, 0.30-0.34% Mn, 0.20-0.30% Mo, 0.02-0.06% Al, 0.02-0.03% Ti, 0-7-1.3% Cr, 0.2-0.6% Ni, 0.01 0.02% P and 0.001-0.002% B by quenching the plate from an 25 austenising temperature and tempering the quenched plate under mild conditions, with the plate having a hardness of 600 Brinell and a Yield Stress of at least 1800 MPa and a Tensile Strength of at least 2000 MPa. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -11 More particularly, the quenched and tempered steel plate in accordance with the present invention is made from steel comprising 0.38-0.42% C, 0.30-0.34% Mn, 0.20-0.30% Mo, 0.02-0.06% Al, 0.02-0.03% Ti, 0-7-1.3% Cr, 0.2-0.6% Ni, 0.01 5 0.02% P and 0.001-0.002% B by quenching the plate from an austenising temperature of around 900*C and tempering the quenched plate at 150-200*C for 30 minutes, with the plate having a hardness of 600 Brinell and a Yield Stress of at least 1800 MPa and a Tensile Strength of at least 2000 MPa. 10 The applicant has carried out extensive research and development work in the field of wear resistant quenched and tempered steel plate and made the invention as part of that work. 15 The work included research and development work as described below. Samples of steel comprising 0.38-0.42% C, 0.30-0.34% 20 Mn, 0.20-0.30% Mo, 0.02-0.06% Al, 0.02-0.03% Ti, 0-7-1.3% Cr, 0.2-0.6% Ni, 0.01-0.02% P and 0.001-0.002% B. in thicknesses ranging from 12-50 mm (specifically 12, 16, 20, 25, 32, 40, and 50 mm) were manufactured from the steel composition by quenching from an austenising temperature of around 900*C and lightly 25 tempering the quenched plate at 150-200*C for 30 minutes. Samples of quenched steel plates made to the above mentioned chemistry limits were tested for tensile properties, impact properties, formability and hardness. 30 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -12 The toughness of 12 mm, 20 mm, 32 mm and 50 mm thick samples of the quenched and lightly tempered steel plates having the above compositions was tested in standard Charpy toughness tests in accordance with Australian Standard AS 1544.2. Tensile 5 testing was carried out on the 12 and 20 mm plates. The results of the test work are summarized in Table 2. Table 2: Tensile and Charpy impact results Thickness PS (MPa) UTS (MPa) Elongation% Cv L @ - Cv T @ 40'C 40'C 12mm 1483 2084 6 Ave 15J Ave 11J 20mm 1406 2073 7 Ave 16J Ave 11J 32mm Ave 15J Ave 15J 50mm Ave 10J Ave 11J 10 Formability was assessed using a 3 point bend test, and the results are shown in Table 3. Table 3: Bend tests Thickness Transverse Longitudinal Bent angle Radius Result Radius Result 12mm 3.6t/dia Failed 4.25t/dia Passed 90 12mm 4.25t/dia Passed 5.3t/dia Passed 90 20mm 5t/dia Passed Na na 90 15 Through hardening characteristics are shown in Figure 1 for the 32 mm plate, which showed through hardening above 600 BH. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -13 Table 4 shows the variation in sub-surface hardness for 12 mm, 16 mm, 20 mm, 25 mm, 32 mm, 40 mm and 50 mm quenched plates, where all plates were within a range of 575-620 BH. 5 Table 4: Sub surface hardiness Thickness 12mm 16mm 20mm 25mm 32mm 40mm 50mm Hardness 575-620 574-599 579-615 576-596 579-607 572-592 579-606 HB During the course of the work, the applicant has developed the following alloy design philosophy that is based on the use of low Mn concentrations and a low Carbon Equivalent 10 (CET) value. Low Mn (low CET) Alloy Design Philosophy Key features of the low Mn (low CET) alloy design are as 15 follows: 1. Low Mn is essential since it imparts: a. Improved weldability (via low CET Carbon Equivalent) since Mn exerts a relatively strong penalty for the CET value. The improved weldability is primarily evident in 20 lower weld HAZ cracking sensitivity and reduced requirements for minimum preheat and weld interpass temperature restrictions. b. Reduced centreline segregation (arising from Mn enrichment in continuously cast slab production) which 25 directly reduces susceptibility to delayed cracking after gas cutting (especially in the hardened quenched condition). 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -14 c. Reduced microstructural banding (arising from Mn microsegregation) which directly enhances isotropic bending performance, Charpy toughness and through thickness tensile ductility. 5 d. Smaller sulphide inclusions at a given sulphur content in the steel so that higher Charpy toughness levels, improved bendability and through thickness tensile ductility are attainable in comparison to high Mn steels. This means that high Mn steels must exercise 10 more severe limitations on both the S content and inclusion morphology than is necessary for low Mn steels to produce equivalent toughness. 2. Ti additions may be used for: 15 a. Combining N in the steel as TiN to minimise the risk for transverse cracking that might otherwise arise from the embrittling formation of grain boundary precipitates of AlN or BN during continuous casting and thereby ensure excellent surface quality. 20 b. Combining N so that boron can be effective in the enhancement of through hardening of the plate during the quenching cycle of the plate heat treatment. c. Partially combining with MnS inclusions to increase their deformation resistance during hot rolling and 25 thereby optimise toughness, bendability and through thickness tensile ductility. d. Provides control of austenite grain size in the austenitising phase of the Q&T heat treatment cycle and in the coarse grained weld heat affected zone thereby 30 enhancing both parent metal plate and weld zone toughness. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -15 3. V additions may be used for: a. Assisting in the risk abatement of delayed cracking in the hardened plate through H trapping mechanisms. b. Controlling the resistance to high temperature 5 softening in wear applications where temperature increases due to abrasive wear, hot environments or the handling of hot materials such as coke can elevate the steel plate temperatures. c. Controlling the balance of toughness and strength 10 required for high strength structural Q&T plates via secondary hardening behaviour. Mo additions may also be used in conjunction with V for this purpose. 4. Ni additions may be used for enhancing low 15 temperature plate toughness. 5. Cr additions may be used as a primary alloying element for ensuring adequate hardenability for through hardening of plates during heat treatment. It is preferred to Mn 20 because of its relatively lower segregating tendencies in steelmaking and its much smaller penalty to the CET carbon equivalent (weldability) than Mn. Basic Method Applied to Low CET Quench and Temper Wear Plates 25 1. Select minimum C content required to achieve a target BHN in quenched condition (after J. M. Hodge and M. A. Orehoski, "Relationship Between Hardenability and Percentage of Martensite in Some Low Alloy Steels," J. AIME, 167 (1946), p. 627.). 30 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -16 2. Select primary aim chemical analysis (based on the above low Mn (and low CET) alloy design philosophy) for the required critical plate thickness consideration (maximum plate thickness to be produced from the selected chemistry range). 5 This key step determines the basic disposition of the steel in relation to weldability (preheat levels, crack resistance), delayed cracking resistance after gas cutting, bendability and through thickness tensile ductility. 10 3. Adjust critical steelmaking parameters, including primary aim chemical analysis to further tailor specific requirements such as for isotropic and low temperature toughness, heat resistance and optimised manufacturability. 15 Basic Method Applied to Tempered Structural Steel Plates 1. Select aim C content required to optimise strength, weldability, and toughness requirements. For a 690 MPa (750 20 MPa tensile strength), this will generally be in the range of 0.12-0.17% C. 2. For nominated C level, select primary aim chemical analysis (based on the above low Mn (and low CET) alloy design 25 philosophy) for the required critical plate thickness consideration (maximum plate thickness to be produced from the selected chemistry range). 3. Adjust critical steelmaking parameters, including 30 primary aim chemical analysis to further tailor specific requirements such as for isotropic and low temperature 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -17 toughness, through tensile ductility, heat resistance and optimised manufacturability. The research and development work carried out using 5 the above-described low Mn (and low CET) approach included the development and assessment of 400, 450 and 500 BH, quench and tempered wear grades, and structural quench and tempered grades with minimum yield strength of 690 MPa (750 MPa tensile strength). 10 Assessment work carried out included, but was not limited to; 1. Surface hardness and through thickness hardness 15 profiles. 2. Tensile properties to determine yield, tensile strength and elongation. 20 3. Bend tests to quantify formability performance. 4. Weldability assessment, which included, but was not limited to: 25 i. Weld bead-on-plate (BOP) tests to determine the parent, heat affected zone (HAZ) and fusion line hardness, 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -18 ii. Transverse weld tensile properties, iii. Weld HAZ Charpy V notch impact properties to determine the toughness of weld fusion line and 5 HAZ at various distances from fusion line, iv. Cold cracking resistance was determined using RRC (Ridged Restraint Cracking) weld tests. 10 Typical chemistries of grades developed via the low Mn philosophy are shown in Table 1. Table 1: Typical chemical composition of quench and tempered grades based on low Mn design. 15 Grade C P Mn Si S Ni Cr Mo Ti B 500HB 0.29 0.015 0.3 0.3 0.003 0.2 1 0.25 0.02 0.0014 450HB 0.2 0.021 0.3 0.5 0.003 0.15 0.8 0.1 0.025 0.0012 450HB 0.23 0.021 0.4 0.6 0.003 0.15 1 0.2 0.025 0.0012 400HB/69OMPa 0.16 0.021 0.35 0.5 0.006 0.027 1 0.1 0.025 0.0014 690MPa 0.14 0.014 0.45 0.5 0.003 0.5 1.1 0.35 0.02 0.0012 In addition to the above grades, the applicant has developed a 600 Brinell Hardness grade via the low Mn philosophy. This grade is particularly suitable for use in the 20 manufacture of armored vehicles and in hard rock mining applications. As described above, the grade is made from steel comprising 0.38-0.42% C, 0.30-0.34% Mn, 0.20-0.30% Mo, 0.02 0.06% Al, 0.02-0.03% Ti, 0-7-1.3% Cr, 0.2-0.6% Ni, 0.01-0.02% P and 0.001-0.002% B. Steel plate in thicknesses ranging from 12 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -19 50 mm (specifically 12, 16, 20, 25, 32, 40, and 50 mm) is manufactured from the steel composition by quenching from an austenising temperature of around 900*C and tempering the quenched plate at 150-200*C for 30 minutes. The plate has a 5 hardness of 600 Brinell and a Yield Stress of 1800 MPa and a Tensile Strength of 2000 MPa. Many modifications may be made to the present invention described above without departing from the spirit and 10 scope of the invention. 4251922_1 (GHMatters) P91313.AU.1 12/04/13
    权利要求:
    Claims (28)
    [1] 1. A quenched steel plate having a thickness of at least 6 mm, a martensite or tempered martensite microstructure, the 5 following composition, in wt%, C: at least 0.3 Mn: < 0.8 Ti: < 0.08 Si: < 0.8 10 Ni: < 2.0 Cr: < 1.5 Mo: < 0.5 Cu: < 0.3 Al: < 0.12 15 Ca: < 0.005 B: < 0.005 P: < 0.040 V: < 0.10 S: < 0.02 20 Fe: balance and incidental impurities.
    [2] 2. The steel plate defined in claim 1 having a CET value not exceeding 0.55 for plate thicknesses in the range 20 <t<= 60mm. 25 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -21
    [3] 3. The steel plate defined in claim 1 having a CET value not exceeding 0.51 for plate thicknesses in the range of t <= 20mm. 5
    [4] 4. The steel plate defined in any one of the preceding claims includes less than 0.55 wt.% C.
    [5] 5. The steel plate defined in any one of the preceding claims includes less than 0.5 wt.% C. 10
    [6] 6. The steel plate defined in any one of the preceding claims includes greater than 0.32 wt.% C.
    [7] 7. The steel plate defined in any one of the preceding 15 claims includes less than 0.7 wt.% Mn.
    [8] 8. The steel plate defined in any one of the preceding claims includes less than 0.3 wt.% Mn. 20
    [9] 9. The steel plate defined in any one of the preceding claims includes greater than 0.15 wt.% Mn.
    [10] 10. The steel plate defined in any one of the preceding claims includes at least 0.01 wt.% Ti. 25
    [11] 11. The steel plate defined in any one of the preceding claims includes 0.01-0.035 wt.% Ti. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -22
    [12] 12. The steel plate defined in any one of the preceding claims includes less than 0.2 wt.% Ni. 5
    [13] 13. The steel plate defined in any one of the preceding claims includes less than 1.0 wt.% Cr.
    [14] 14. The steel plate defined in any one of the preceding claims includes less than 0.3 wt.% Mo. 10
    [15] 15. The steel plate defined in any one of the preceding claims includes less than 0.0015 wt.% Ca.
    [16] 16. The steel plate defined in any one of the preceding 15 claims having a toughness, after quenching and as measured in a Charpy impact test in a longitudinal direction with a 10 mm x 10 mm test sample, of typically 15J at a test temperature of -40*C.
    [17] 17. The steel plate defined in any one of the preceding 20 claims having a toughness, after quenching and as measured in a Charpy impact test in a transverse direction with a 10 mm x 10 mm test sample, of typically 10J at a test temperature of -40*C.
    [18] 18. The steel plate defined in any one of the preceding 25 claims having a hardness after quenching of at least 570 Brinell through the thickness of the plate. 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -23
    [19] 19. The steel plate defined in any one of claims 1 -17 wherein the hardness of the steel plate after quenching varies through the thickness of the plate, with the hardness at the surface of the plate being at least 570 Brinell. 5
    [20] 20. The steel plate defined in any one of the preceding claims having a tensile strength after quenching of at least 1800 MPa. 10
    [21] 21. The steel plate defined in any one of the preceding claims having a thickness of 6-60 mm.
    [22] 22. A process for manufacturing the steel plate defined in any one of the preceding claims includes: 15 (a) continuously casting slabs of steel having a required composition; (b) hot rolling the slabs to form pattern plate or coil 20 plate having a required thickness; (c) treating the hot rolled steel plate by: (i) heating the steel plate to the austenising 25 temperature range and holding the steel plate in the temperature range for a predetermined time; and 4251922_1 (GHMatters) P91313.AU.1 12/04/13 -24 (ii) quenching the steel plate.
    [23] 23. The process defined in claim 22 wherein treatment step (c) includes tempering the quenched steel plate at a 5 predetermined temperature.
    [24] 24. A quenched and tempered steel plate made from steel comprising 0.38-0.42% C, 0.30-0.34% Mn, 0.20-0.30% Mo, 0.02 0.06% Al, 0.02-0.03% Ti, 0-7-1.3% Cr, 0.2-0.6% Ni, 0.01-0.02% P 10 and 0.001-0.002% B by quenching the plate from an austenising temperature and tempering the quenched plate under mild conditions, with the plate having a hardness of 600 Brinell and a Yield Stress of at least 1800 MPa and a Tensile Strength of at least 2000 MPa. 15
    [25] 25. A product made from the steel plate defined in any one of claims 1-21.
    [26] 26. The product defined in claim 25 includes a wear liner 20 such as a dump truck wear liner.
    [27] 27. Equipment for the mining and the construction industries that includes the steel plate defined in any one of claims 1-21. 25
    [28] 28. The equipment defined in claim 27 includes any one or more of dump trucks, chutes, earth moving buckets, and ground engaging tools. 4251922_1 (GHMatters) P91313.AU.1 12/04/13
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    法律状态:
    2016-09-08| DA3| Amendments made section 104|Free format text: THE NATURE OF THE AMENDMENT IS: AMEND THE NAME OF THE INVENTOR TO READ WILLIAMS, JIM |
    2017-01-19| FGA| Letters patent sealed or granted (standard patent)|
    优先权:
    申请号 | 申请日 | 专利标题
    AU2012904577||2012-10-19||
    AU2012904577A|AU2012904577A0||2012-10-19|Steel Plate|
    AU2013204206A|AU2013204206B2|2012-10-19|2013-04-12|Steel Plate|AU2013204206A| AU2013204206B2|2012-10-19|2013-04-12|Steel Plate|
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