CN102691000A - Steel plate for engineering machinery and rolling and heat treatment technologies thereof - Google Patents
Steel plate for engineering machinery and rolling and heat treatment technologies thereof Download PDFInfo
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- CN102691000A CN102691000A CN2012101999790A CN201210199979A CN102691000A CN 102691000 A CN102691000 A CN 102691000A CN 2012101999790 A CN2012101999790 A CN 2012101999790A CN 201210199979 A CN201210199979 A CN 201210199979A CN 102691000 A CN102691000 A CN 102691000A
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Abstract
The invention discloses a steel plate for engineering machinery and rolling and heat treatment technologies thereof, belonging to the field of material forming technology. The plate blank comprises the following chemical components in percentage by weight: 0.05-0.12% of C, 0.15-0.50% of Si, 1.5-1.9% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, greater than or equal to 0.020% of Alt, 0.030-0.060% of Nb, 0.030-0.065% of V, 0.008-0.020% of Ti, 0.150-0.30% of Cr, 0.08-0.20% of Mo, less than or equal to 0.0010% of RE, and the balance of Fe and inevitable impurities. In the rolling technology, the heating temperature is 1,200-1,250 DEG C, the heating time is longer than or equal to 200 minutes, the soaking time is longer than or equal to 30 minutes, the rough rolling start temperature is 1,180-1,230 DEG C, the finish rolling start temperature is 870-920 DEG C, the finishing temperature is 850-890 DEG C, the Acc final cooling temperature is 520-620 DEG C, and the cooling speed is 10-20 DEG C/s. In the heat treatment technology, the tempering temperature is 600-690 DEG C, and a steel plate with the thickness of 60-100mm is produced. In terms of mechanical properties, the tensile strength is greater than or equal to 690MPa, the yield strength is greater than or equal to 550MPa, the elongation is greater than or equal to 18%, the longitudinal impact energy at (-20)-(-40) DEG C is greater than 120J, the Z-direction property is greater than 40%, and the carbon equivalent is not greater than 0.47%; and moreover, the welding property is good, and the production cost is low.
Description
Technical field
A kind of engineering machinery belongs to the forming materials technical field with steel plate and rolling, thermal treatment process thereof, particularly hot-rolled steel plate and thermal treatment process.
Background technology
At present; Engineering machinery is comparatively common with quenched and tempered steel with steel plate, is that 200810041043 " 700MPa grade high strength and high toughness hardened and tempered steel plate and method of manufacture thereof cheaply ", number of patent application are that 200810042124 " good extra-thick quenched and tempered steel plate and the method for manufacture thereof of a kind of obdurability coupling ", number of patent application are 201110337489.8 " a kind of engineering machinery is with high-performance hardened and tempered steel plate and production technique thereof " etc. like number of patent application.With regard to the composition System Design, be main with low-carbon low-alloy steel mostly.This patent is in order to practice thrift the production technique cost; Develop the low-cost engineering machinery of a kind of thick specification and use steel plate, handle, can obtain ys >=550MPa, tensile strength >=690MPa through the TMCP+ tempering process; The impact of collision merit is greater than 120J under-20 ℃~-40 ℃ conditions, Z to performance greater than 40%.Carbon equivalent is not more than 0.47%, and welding property is good, and production cost is low.
Summary of the invention
The objective of the invention is to disclose a kind of engineering machinery with steel plate and rolling, thermal treatment process thereof, the chemical ingredients of its slab and content (weight percent) should meet: C 0.05-0.12%, Si 0.15-0.50%, Mn 1.5-1.9%; P≤0.018%, S≤0.005%, Alt>=0.020%, Nb 0.030-0.060%; V 0.030-0.065%, Ti 0.008-0.020%, Cr 0.150-0.30%; Mo 0.08-0.20%, RE≤0.0010%, surplus is Fe and unavoidable impurities.
Rolling technology is: Heating temperature is 1200-1250 ℃, heat-up time >=200 minute, and soaking time >=30 minute, the roughing start rolling temperature is 1180-1230 ℃, 870-920 ℃ of finish rolling start rolling temperature, finishing temperature 850-890 ℃; 520-620 ℃ of Acc final cooling temperature, speed of cooling 10-20 ℃/s.Thermal treatment process is: tempering temperature 600-690 ℃.
Outstanding advantage of the present invention is that can to produce thickness be the steel plate of 60-100mm specification to the TMCP+ temper and have excellent mechanical property, its tensile strength >=690MPa, ys >=550MPa; Unit elongation >=18%; The impact of collision merit is greater than 120J under-20 ℃~-40 ℃ conditions, and greater than 40%, carbon equivalent is not more than 0.47% to Z to performance; Welding property is good, and production cost is low.
Embodiment
Below in conjunction with embodiment the present invention is done further description.
Embodiment 1:
With intending rolling thickness is that the slab of 300mm is put into process furnace, and the slab tapping temperature is 1240 ℃, and 240 minutes heat-up times, soaking time is 30 minutes, and the chemical ingredients of slab and content (weight percent) are: C 0.087%; Si 0.443%, and Mn 1.75%, and P 0.015%, and S 0.003%; Alt 0.024%, and Nb 0.053%, and V 0.056%, and Ti 0.012%; Cr 0.232%, and Mo 0.118%, and Ce 0.0001%, and surplus is Fe and unavoidable impurities.Be rolled into the steel plate that thickness is 100mm, detailed rolling and thermal treatment process is seen table 1, and its mechanical property is seen table 2.
Rolling and the thermal treatment process of table 1
The mechanical property of table 2 steel plate
Embodiment 2:
With intending rolling thickness is that the slab of 300mm is put into process furnace, and the slab tapping temperature is 1230 ℃, and 240 minutes heat-up times, soaking time is 30 minutes, and start rolling temperature is 1195 ℃; The chemical ingredients of slab and content (weight percent) are: C 0.087%, and Si 0.462%, and Mn 1.74%, and P 0.012%, and S 0.002%; Alt 0.026%, and Nb 0.053%, and V 0.055%, and Ti 0.013%; Cr 0.227%, and Mo 0.116%, and Ce 0.0001%, and surplus is Fe and unavoidable impurities.Be rolled into the steel plate that thickness is 90mm, detailed rolling and thermal treatment process is seen table 3, and its mechanical property is seen table 4.
Rolling and the thermal treatment process of table 3
The mechanical property of table 4 steel plate
Claims (2)
1. an engineering machinery is used steel plate, it is characterized in that chemical composition content is by weight percentage: C 0.05-0.12%, Si 0.15-0.50%, Mn 1.5-1.9%; P≤0.018%, S≤0.005%, Alt>=0.020%, Nb 0.030-0.060%; V 0.030-0.065%, Ti 0.008-0.020%, Cr 0.150-0.30%; Mo 0.08-0.20%, RE≤0.0010%, surplus is Fe and unavoidable impurities.
2. an engineering machinery is with rolling, the thermal treatment process of steel plate; It is characterized in that said steel plate has the described chemical ingredients of claim 1, its rolling technology is following: Heating temperature is 1200-1250 ℃, heat-up time >=200 minute; Soaking time >=30 minute; The roughing start rolling temperature is 1180-1230 ℃, 870-920 ℃ of finish rolling start rolling temperature, finishing temperature 850-890 ℃; 520-620 ℃ of Acc final cooling temperature, speed of cooling 10-20 ℃/s; Its thermal treatment process is: tempering temperature 600-690 ℃, can produce the steel plate that thickness is 60-100mm.
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CN2012101999790A CN102691000A (en) | 2012-06-18 | 2012-06-18 | Steel plate for engineering machinery and rolling and heat treatment technologies thereof |
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CN2012101999790A CN102691000A (en) | 2012-06-18 | 2012-06-18 | Steel plate for engineering machinery and rolling and heat treatment technologies thereof |
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CN2012101999790A Pending CN102691000A (en) | 2012-06-18 | 2012-06-18 | Steel plate for engineering machinery and rolling and heat treatment technologies thereof |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103469086A (en) * | 2013-08-23 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | High-strength and high-toughness thick steel plate and production process thereof |
CN103468902A (en) * | 2013-08-23 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Method for improving through-thickness characteristics of thickness-specification high-strength steel |
CN103468903A (en) * | 2013-08-23 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Method for improving low-temperature impact toughness of high-strength steel |
CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
CN106591714A (en) * | 2016-11-03 | 2017-04-26 | 内蒙古包钢钢联股份有限公司 | Steel plate for yield strength 700 MPa grade construction machinery, and preparation method thereof |
CN108070789A (en) * | 2018-01-17 | 2018-05-25 | 山东钢铁集团日照有限公司 | The special thick steel of not less than 480MPa grades Ultra-fine Graineds of yield strength and preparation method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102418050A (en) * | 2011-12-12 | 2012-04-18 | 秦皇岛首秦金属材料有限公司 | Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel |
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2012
- 2012-06-18 CN CN2012101999790A patent/CN102691000A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102418050A (en) * | 2011-12-12 | 2012-04-18 | 秦皇岛首秦金属材料有限公司 | Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel |
Non-Patent Citations (1)
Title |
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刘晓东等: "《ACC水冷工艺分析及在生产中的应用》", 《山东冶金》, vol. 29, no. 5, 31 October 2007 (2007-10-31), pages 5 - 8 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103469086A (en) * | 2013-08-23 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | High-strength and high-toughness thick steel plate and production process thereof |
CN103468902A (en) * | 2013-08-23 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Method for improving through-thickness characteristics of thickness-specification high-strength steel |
CN103468903A (en) * | 2013-08-23 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Method for improving low-temperature impact toughness of high-strength steel |
CN103468902B (en) * | 2013-08-23 | 2015-04-22 | 内蒙古包钢钢联股份有限公司 | Method for improving through-thickness characteristics of thickness-specification high-strength steel |
CN103468903B (en) * | 2013-08-23 | 2015-06-03 | 内蒙古包钢钢联股份有限公司 | Method for improving low-temperature impact toughness of high-strength steel |
CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
CN106591714A (en) * | 2016-11-03 | 2017-04-26 | 内蒙古包钢钢联股份有限公司 | Steel plate for yield strength 700 MPa grade construction machinery, and preparation method thereof |
CN108070789A (en) * | 2018-01-17 | 2018-05-25 | 山东钢铁集团日照有限公司 | The special thick steel of not less than 480MPa grades Ultra-fine Graineds of yield strength and preparation method |
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Application publication date: 20120926 |