CN105177421A - Special steel plate with yield strength being 500 MPa and for forklift cross beam and preparation method of steel plate - Google Patents
Special steel plate with yield strength being 500 MPa and for forklift cross beam and preparation method of steel plate Download PDFInfo
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Abstract
The invention relates to a special steel plate with the yield strength being 500 MPa and for a forklift cross beam and a preparation method of the steel plate. The steel plate comprises, by mass, 0.08%-0.18% of C, 0.03%-0.55% of Si, 0.80%-1.70% of Mn, 0%-0.012% of P, 0%-0.005% of S, 0.01%-0.05% of Nb, 0.015%-0.075% of V, 0.005%-0.035% of Ti, 0.003%-0.012% of N, and the balance Fe and unavoidable impurities. The preparation method of the steel plate includes the steps that desulphurization and deoxidation are carried out on blast-furnace molten iron; continuous casting is carried out by introducing argon, and cast blanks are stacked for slow cooling; two-stage rolling is adopted for the cast blanks; after rolling, controlled cooling is carried out through an accelerated cooling control (ACC) process; and the normalizing and accelerated cooling processes are adopted for the steel plate. The production procedure is simple and easy to control, the production cost is low, and the steel plate is suitable for various welding modes of the forklift cross beam and has broad market prospects.
Description
Technical field
The invention belongs to low-alloy high-tensile structural steel plate manufacturing technology field, particularly, the present invention relates to a kind of yield strength is 500MPa rank forklift truck transverse beam steel plate special and preparation method thereof.
Background technology
Yield strength is 500MPa rank forklift truck transverse beam steel plate special, is on Nippon Standard JISG3106 standard SM570 trade mark basis, requires lower carbon equivalent further, improves intensity and toughness rank simultaneously.For ensureing low-carbon-equivalent requirement, when Composition Design, C, Mn constituent content is unsuitable too high, and in normalizing heat treatment process, the factors such as normal C, Mn element because of of steel plate itself is on the low side, cause intensity lower than standard and user's requirement.The domestic steel mill method of adding the elements such as Cu, Cr, Ni that adopts improves intensity of normalized steel plate and toughness more.But adopt the method production cost of above-mentioned interpolation alloying element significantly to raise, and made Plate Welding performance does not reach requirement.
Summary of the invention
The object of the invention is to; providing a kind of yield strength is 500MPa rank forklift truck transverse beam steel plate special, and this Plate Production process is simple, be easy to control, and production cost is low; be adapted to the multiple welding manufacture technique of manual metal-arc welding, union-melt weld and shielded welding, there is after welding excellent mechanical property.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of yield strength is 500MPa rank forklift truck transverse beam steel plate special, by percentage to the quality, the chemical composition of described steel plate comprises: C:0.08 ~ 0.18, Si:0.03 ~ 0.55, Mn:0.80 ~ 1.70, P :≤0.012, S :≤0.005, Nb:0.01 ~ 0.05, V:0.015 ~ 0.075, Ti:0.005 ~ 0.035, N:0.003 ~ 0.012, all the other are for Fe and be inevitably mingled with;
Carbon equivalent calculation formula is: [CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] × 100%, carbon equivalent controls 0.36% ~ 0.40%.
Present invention also offers the preparation method that a kind of yield strength is 500MPa rank forklift truck transverse beam steel plate special, described preparation method comprises the steps:
1) blast-melted desulfurization, adopts oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carries out alloying; Oxygen level≤the 60ppm of molten steel after deoxidation;
2) refining, adopt TiFe alloy final deoxygenation, keep oxygen level 10ppm ~ 40ppm, temperature controls, at 1595 DEG C ~ 1565 DEG C, then to connect argon gas, protection continuous casting, casting blank stacking slow cooling 36h ~ 48h, slab thickness 200 ~ 300mm;
3) rolling, strand heating zone temperature 1150 DEG C ~ 1230 DEG C, rate of heating 8min/cm ~ 11min/cm; Adopt two-stage rolling, the steel plate of rolling thickness 50mm ~ 120mm;
4) roll the control of rear employing ACC technique cold, the upper and lower water of speed of cooling 6 DEG C/S ~ 10 DEG C/S, Mulpic accelerating cooling than in 1:1.1 ~ 1:1.80 scope, steel plate red temperature 630 DEG C ~ 700 DEG C;
5) normalizing+accelerated cooling process, normalizing temperature 850 DEG C ~ 900 DEG C, normalizing time 1.2min/mm ~ 2.0min/mm, speed of cooling 5 DEG C/S ~ 8 DEG C/S, steel plate red temperature 630 DEG C ~ 700 DEG C, obtaining yield strength is 500MPa rank forklift truck transverse beam steel plate special.
Step 2 of the present invention) in, argon flow amount 1.0m
3/ min ~ 2.0m
3/ min.
Step 3 of the present invention) in, roughing start rolling temperature 1110 DEG C ~ 1170 DEG C, roughing finishing temperature 1040 DEG C ~ 1110 DEG C, workpiece thickness 120mm ~ 160mm; Finish rolling start rolling temperature 840 DEG C ~ 930 DEG C, finish to gauge start rolling temperature 780 DEG C ~ 850 DEG C.
Compared with prior art, advantage of the present invention is as follows:
1, the chemical composition design of steel is based on C, Si, Mn, P, S element, and auxiliary one or more microalloy elements added in Nb, V, Ti, do not add other noble elements, thus reduce cost of alloy; Carry out Clean Steel smelting simultaneously, reduce foreign impurity, ensure steel plate inspection qualification rate.
2, meeting thickness specification is 50mm ~ 120mm; yield strength is the forklift truck transverse beam steel plate special of 500MPa ,-40 DEG C of low temperature impact properties >=100J; the multiple welding manufacture technique of manual metal-arc welding, union-melt weld and shielded welding can be adapted to, there is after Plate Welding excellent mechanical property.
3, production process simple, be easy to control, production cost is low, is applicable to forklift truck transverse beam and manufactures field, steel plate comprehensive mechanical property and and welding property excellent, create good economic benefit and social benefit.
4, the R of steel plate of the present invention
eH>=500Mpa, R
m630 ~ 720MPa, A/%>=26, A
kV>=60J, C
eq≤ 0.40%.
5, this product is delivered goods with as-normalized condition, is mainly used in forklift truck transverse beam and manufactures field, can replace part shaped steel after mechanical workout, and improve material use efficiency further and reduce purchase cost, wherein 50mm ~ 120mm usage quantity is maximum.
6, the present invention adopts the Composition Design system of not adding noble element, reduces production cost on the one hand, avoids the elements such as Cu, Cr, Ni on the other hand to the difficulty of smelting and continuous casting brings, improves welding property simultaneously.
7, the steel plate adopting the present invention to produce, can be adapted to the multiple welding manufacture technique of manual metal-arc welding, union-melt weld and shielded welding.Welding conditions is: heat input≤50KJ/cm, and welding current is 48A ~ 680A, weldingvoltage is 24V ~ 35V, and welding speed is 100cm/min ~ 30cm/min.There is after Plate Welding excellent mechanical property.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
The specific chemical composition of embodiment 1-3 steel plate is in table 1.
The chemical composition (%, wt, heat analysis) of table 1 steel
Embodiment 1
Yield strength is a preparation method for 500MPa rank forklift truck transverse beam steel plate special, and described preparation method comprises the following steps:
1) blast-melted desulfurization, adopts oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carries out alloying; Oxygen level≤the 60ppm of molten steel after deoxidation;
2) refining, adopt TiFe alloy final deoxygenation, keep oxygen level 10ppm, temperature controls, at 1595 DEG C ~ 1565 DEG C, then to connect argon gas (flow 1.0m
3/ min ~ 2.0m
3/ min) protect continuous casting, casting blank stacking slow cooling 36h, slab thickness 200mm;
3) rolling, strand heating zone temperature 1150 DEG C, rate of heating 8min/cm; Adopt two-stage rolling, rough rolling step austenite recrystallization, start rolling temperature 1110 DEG C, roughing finishing temperature 1040 DEG C, workpiece thickness 120mm; Finish rolling stage austenite non-recrystallization, start rolling temperature 930 DEG C, finish to gauge start rolling temperature 780 DEG C; The steel plate of rolling thickness 50mm;
4) roll the control of rear employing ACC technique cold, speed of cooling 6 DEG C/upper and lower water of S, Mulpic accelerating cooling than 1:1.80, steel plate red temperature 700 DEG C;
5) steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature 850 DEG C, normalizing time 1.2min/mm, speed of cooling 5 DEG C/S, steel plate red temperature 700 DEG C.Obtain finished product thickness 50mm, yield strength is the forklift truck transverse beam steel plate special of 500MPa rank.
Embodiment 2
Yield strength is a preparation method for 500MPa rank forklift truck transverse beam steel plate special, and described preparation method comprises the following steps:
1) blast-melted desulfurization, adopts oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carries out alloying; Oxygen level≤the 60ppm of molten steel after deoxidation;
2) refining, adopt TiFe alloy final deoxygenation, keep oxygen level 40ppm, temperature controls, at 1595 DEG C ~ 1565 DEG C, then to connect argon gas (flow 1.0m
3/ min ~ 2.0m
3/ min) protect continuous casting, casting blank stacking slow cooling 36h, slab thickness 250mm;
3) rolling, strand heating zone temperature 1190 DEG C, rate of heating 10min/cm; Adopt two-stage rolling, rough rolling step austenite recrystallization, start rolling temperature 1140 DEG C, roughing finishing temperature 1070 DEG C, workpiece thickness 140mm; Finish rolling stage austenite non-recrystallization, start rolling temperature 880 DEG C, finish to gauge start rolling temperature 860 DEG C; The steel plate of rolling thickness 80mm;
4) roll the control of rear employing ACC technique cold, speed of cooling 8 DEG C/upper and lower water of S, Mulpic accelerating cooling than 1:1.60, steel plate red temperature 660 DEG C;
5) steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature 870 DEG C, normalizing time 1.4min/mm, speed of cooling 6 DEG C/S, steel plate red temperature 660 DEG C.Obtain finished product thickness 80mm, yield strength is the forklift truck transverse beam steel plate special of 500MPa rank.
Embodiment 3
Yield strength is a preparation method for 500MPa rank forklift truck transverse beam steel plate special, and described preparation method comprises the following steps:
1) blast-melted desulfurization, adopts oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carries out alloying; Oxygen level≤the 60ppm of molten steel after deoxidation;
2) refining, adopt TiFe alloy final deoxygenation, keep oxygen level 20ppm, temperature controls, at 1595 DEG C ~ 1565 DEG C, then to connect argon gas (flow 1.0m
3/ min ~ 2.0m
3/ min) protect continuous casting, casting blank stacking slow cooling 48h, slab thickness 300mm;
3) rolling, strand heating zone temperature 1230 DEG C, rate of heating 11min/cm; Adopt two-stage rolling, rough rolling step austenite recrystallization, start rolling temperature 1170 DEG C, roughing finishing temperature 1110 DEG C, workpiece thickness 160mm; Finish rolling stage austenite non-recrystallization, start rolling temperature 840 DEG C, finish to gauge start rolling temperature 830 DEG C; The steel plate of rolling thickness 120mm;
4) roll the control of rear employing ACC technique cold, speed of cooling 10 DEG C/upper and lower water of S, Mulpic accelerating cooling than 1:1.10, steel plate red temperature 630 DEG C;
5) steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature 900 DEG C, normalizing time 2.0min/mm, speed of cooling 8 DEG C/S, steel plate red temperature 630 DEG C.Obtain finished product thickness 120mm, yield strength is the forklift truck transverse beam steel plate special of 500MPa rank;
The steel plate produced in batches according to embodiment 1 ~ embodiment 3 carries out detecting a flaw and mechanical properties test, the results are shown in Table 2.Also carried out submerged arc welding to the steel plate that embodiment 1 ~ embodiment 3 is produced, weldprocedure and joint performance are in table 3.
Table 2 mechanical property of steel plate and flaw detection result
Table 3 steel plate submerged-arc welding process and joint-40 DEG C of impelling strength
Shown by table 2 and table 3 result, the yield strength adopting the present invention to produce is that 500MPa rank forklift truck transverse beam steel plate special has excellent mechanical property, the welding property of steel plate meets the working condition of use and manufacturer completely, can be widely used in forklift truck transverse beam and manufacture field.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to embodiment to invention has been detailed description, will be understood by those skilled in the art that, modify to technical scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. yield strength is a 500MPa rank forklift truck transverse beam steel plate special, it is characterized in that, by percentage to the quality, the chemical composition of described steel plate comprises: C:0.08 ~ 0.18, Si:0.03 ~ 0.55, Mn:0.80 ~ 1.70, P :≤0.012, S :≤0.005, Nb:0.01 ~ 0.05, V:0.015 ~ 0.075, Ti:0.005 ~ 0.035, N:0.003 ~ 0.012, all the other are for Fe and be inevitably mingled with;
Carbon equivalent calculation formula is: [CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] × 100%, carbon equivalent controls 0.36% ~ 0.40%.
2. yield strength is a preparation method for 500MPa rank forklift truck transverse beam steel plate special, and described preparation method comprises the steps:
1) blast-melted desulfurization, adopts oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carries out alloying; Oxygen level≤the 60ppm of molten steel after deoxidation;
2) refining, adopt TiFe alloy final deoxygenation, keep oxygen level 10ppm ~ 40ppm, temperature controls, at 1595 DEG C ~ 1565 DEG C, then to connect argon gas, protection continuous casting, casting blank stacking slow cooling 36h ~ 48h, slab thickness 200 ~ 300mm;
3) rolling, strand heating zone temperature 1150 DEG C ~ 1230 DEG C, rate of heating 8min/cm ~ 11min/cm; Adopt two-stage rolling, the steel plate of rolling thickness 50mm ~ 120mm;
4) roll the control of rear employing ACC technique cold, the upper and lower water of speed of cooling 6 DEG C/S ~ 10 DEG C/S, Mulpic accelerating cooling than in 1:1.1 ~ 1:1.80 scope, steel plate red temperature 630 DEG C ~ 700 DEG C;
5) normalizing+accelerated cooling process, normalizing temperature 850 DEG C ~ 900 DEG C, normalizing time 1.2min/mm ~ 2.0min/mm, speed of cooling 5 DEG C/S ~ 8 DEG C/S, steel plate red temperature 630 DEG C ~ 700 DEG C, obtaining yield strength is 500MPa rank forklift truck transverse beam steel plate special.
3. a kind of yield strength according to claim 2 is the preparation method of 500MPa rank forklift truck transverse beam steel plate special, it is characterized in that, step 2) in, argon flow amount 1.0m
3/ min ~ 2.0m
3/ min.
4. a kind of yield strength according to claim 2 is the preparation method of 500MPa rank forklift truck transverse beam steel plate special, it is characterized in that, step 3) in, roughing start rolling temperature 1110 DEG C ~ 1170 DEG C, roughing finishing temperature 1040 DEG C ~ 1110 DEG C, workpiece thickness 120mm ~ 160mm; Finish rolling start rolling temperature 840 DEG C ~ 930 DEG C, finish to gauge start rolling temperature 780 DEG C ~ 850 DEG C.
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Cited By (6)
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| CN106011647A (en) * | 2016-07-21 | 2016-10-12 | 唐山钢铁集团有限责任公司 | 460MPa-level extra-thick plate and production method thereof |
| CN109161799A (en) * | 2018-09-20 | 2019-01-08 | 山东钢铁股份有限公司 | A kind of pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
| CN109321838A (en) * | 2018-08-30 | 2019-02-12 | 南京钢铁股份有限公司 | High silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method |
| CN109930074A (en) * | 2019-04-09 | 2019-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | The composite brake beam steel of railway freight-car containing Nb and its manufacturing method with corrosion resisting property |
| CN109930073A (en) * | 2019-04-09 | 2019-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Railway freight-car composite brake beam steel and its manufacturing method containing V, Ti |
| CN109930072A (en) * | 2019-04-09 | 2019-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Railway freight-car composite brake beam steel and its manufacturing method containing Nb, Ni |
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| CN102330020A (en) * | 2011-10-20 | 2012-01-25 | 武汉钢铁(集团)公司 | Manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011647A (en) * | 2016-07-21 | 2016-10-12 | 唐山钢铁集团有限责任公司 | 460MPa-level extra-thick plate and production method thereof |
| CN109321838A (en) * | 2018-08-30 | 2019-02-12 | 南京钢铁股份有限公司 | High silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method |
| CN109161799A (en) * | 2018-09-20 | 2019-01-08 | 山东钢铁股份有限公司 | A kind of pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
| CN109930074A (en) * | 2019-04-09 | 2019-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | The composite brake beam steel of railway freight-car containing Nb and its manufacturing method with corrosion resisting property |
| CN109930073A (en) * | 2019-04-09 | 2019-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Railway freight-car composite brake beam steel and its manufacturing method containing V, Ti |
| CN109930072A (en) * | 2019-04-09 | 2019-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Railway freight-car composite brake beam steel and its manufacturing method containing Nb, Ni |
| CN109930072B (en) * | 2019-04-09 | 2020-08-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Nb and Ni-containing steel for railway wagon combined brake beam and manufacturing method thereof |
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