CN105177421B - A kind of yield strength is 500MPa rank forklift truck transverse beam steel plate specials and preparation method thereof - Google Patents
A kind of yield strength is 500MPa rank forklift truck transverse beam steel plate specials and preparation method thereof Download PDFInfo
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- CN105177421B CN105177421B CN201510645919.0A CN201510645919A CN105177421B CN 105177421 B CN105177421 B CN 105177421B CN 201510645919 A CN201510645919 A CN 201510645919A CN 105177421 B CN105177421 B CN 105177421B
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Abstract
It is 500MPa rank forklift truck transverse beam steel plate specials and preparation method thereof the present invention relates to a kind of yield strength, by percentage to the quality, the chemical composition of the steel plate includes：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, remaining is Fe and is inevitably mingled with.Its preparation method is：Blast-melted desulfating and deoxidation, leads to argon gas continuous casting, casting blank stacking slow cooling；Strand is rolled using the two-stage；It is cold with ACC technique controls after rolling；Steel plate normalizing+accelerated cooling process.Production process of the present invention is simple, easily controllable, low production cost, it is adaptable to the various welding manners of forklift truck transverse beam, wide market.
Description
Technical field
The invention belongs to low-alloy high-tensile structural steel plate manufacturing technology field, in particular it relates to a kind of surrender
Intensity is 500MPa rank forklift truck transverse beam steel plate specials and preparation method thereof.
Background technology
Yield strength is 500MPa rank forklift truck transverse beam steel plate specials, is in Nippon Standard JIS G3106 standard SM570 boards
On the basis of number, the lower carbon equivalent of further requirement, while improving intensity and toughness rank.To ensure low-carbon-equivalent requirement,
C, Mn constituent content are unsuitable too high during composition design, and in normalizing heat treatment process, steel plate is often because C, Mn element of itself are relatively low
Etc. factor, intensity is caused to be required less than standard and user.Improved using the method for the elements such as addition Cu, Cr, Ni more than domestic steel mill
Intensity of normalized steel plate and toughness.But can significantly be raised using the method production cost of above-mentioned addition alloying element, and made steel
Plate weld performance does not reach requirement.
The content of the invention
It is an object of the present invention to provide a kind of yield strength is 500MPa rank forklift truck transverse beam steel plate specials, the steel
Plate production process is simple, easily controllable, low production cost, is adapted to manual metal-arc welding, submerged-arc welding and the various welding systems of gas shielded arc welding
Technique is made, there is excellent mechanical property after welding.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of yield strength is 500MPa rank forklift truck transverse beam steel plate specials, by percentage to the quality, the change of the steel plate
Studying point includes：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, remaining is for Fe and inevitably
It is mingled with；
Carbon equivalent computing formula is：[CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] × 100%, carbon equivalent control
System is 0.36%~0.40%.
It is the preparation method of 500MPa rank forklift truck transverse beam steel plate specials present invention also offers a kind of yield strength, it is described
Preparation method comprises the following steps：
1) blast-melted desulfurization, using oxygen top and bottom combined blown converter smelting into molten steel, is taken off using SiFe, MnFe alloy
Oxygen, and carry out alloying；Oxygen content≤the 60ppm of molten steel after deoxidation；
2) refine, using TiFe alloy final deoxidizings, keep oxygen content 10ppm~40ppm, temperature control 1595 DEG C~
1565 DEG C, argon gas is then turn on, protects continuous casting, casting blank stacking slow cooling 36h~48h, 200~300mm of slab thickness；
3) roll, heating strand 1150 DEG C~1230 DEG C of temperature of section, firing rate 8min/cm~11min/cm；Using two
Stage rolling, the steel plate of rolling thickness 50mm~120mm；
4) cold using ACC technique controls after rolling, 6 DEG C/S~10 DEG C of cooling velocity/S, Mulpic accelerates the upper and lower water ratio of cooling to exist
1:1.1~1:1.80 scopes, 630 DEG C~700 DEG C of steel plate red temperature；
5) normalizing+accelerated cooling process, 850 DEG C~900 DEG C of normalizing temperature, normalizing time 1.2min/mm~2.0min/
Mm, 5 DEG C/S~8 DEG C of cooling velocity/S, 630 DEG C~700 DEG C of steel plate red temperature obtains yield strength for 500MPa rank fork trucks
Crossbeam steel plate special.
Step 2 of the present invention) in, argon flow amount 1.0m3/ min~2.0m3/min。
Step 3 of the present invention) in, 1110 DEG C~1170 DEG C of roughing start rolling temperature, 1040 DEG C~1110 DEG C of roughing finishing temperature,
Workpiece thickness 120mm~160mm；840 DEG C~930 DEG C of finish rolling start rolling temperature, 780 DEG C~850 DEG C of finish to gauge start rolling temperature.
Compared with prior art, advantages of the present invention is as follows：
1st, the Design of Chemical Composition of steel is based on C, Si, Mn, P, S element, and one or more in auxiliary addition Nb, V, Ti is micro-
Alloying element, without other noble elements, so as to reduce cost of alloy；Clean steel smelting is carried out simultaneously, reduces foreing impuritys
Thing, it is ensured that steel plate inspection qualification rate.
2nd, thickness specification is met for 50mm~120mm, and yield strength is 500MPa, -40 DEG C of low temperature impact properties >=100J
Forklift truck transverse beam steel plate special, adapt in manual metal-arc welding, submerged-arc welding and the various welding manufacture techniques of gas shielded arc welding, steel plate welding
There is excellent mechanical property afterwards.
3rd, production process is simple, easily controllable, low production cost, it is adaptable to which forklift truck transverse beam manufactures field, steel plate resultant force
Performance and excellent with welding performance is learned, good economic benefit and social benefit is generated.
4th, the R of steel plate of the present inventioneH>=500Mpa, Rm630~720MPa, A/% >=26, AKV>=60J, Ceq≤ 0.40%.
5th, the product is delivered goods with normalized condition, is mainly used in forklift truck transverse beam manufacture field, can generation after over mechanical processing
For part shaped steel, further improve stock utilization and reduce purchase cost, wherein 50mm~120mm usage amounts are maximum.
6th, on the one hand the present invention reduces production cost, the opposing party using the composition design system without noble element
Face avoids the elements such as Cu, Cr, Ni to the difficulty smelted and continuous casting belt comes, while improve welding performance.
7th, using the steel plate of present invention production, adapt in manual metal-arc welding, submerged-arc welding and the various welding manufactures of gas shielded arc welding
Technique.Welding condition is：Heat input≤50KJ/cm, welding current is 48A~680A, weldingvoltage is 24V~35V, welding speed
It is 100cm/min~30cm/min to spend.There is excellent mechanical property after steel plate welding.
Specific embodiment
With reference to embodiment, the present invention is further detailed explanation.
The specific chemical composition of embodiment 1-3 steel plates is shown in Table 1.
The chemical composition (%, wt, heat analysis) of the steel of table 1
Embodiment 1
A kind of yield strength for 500MPa rank forklift truck transverse beam steel plate specials preparation method, the preparation method include with
Lower step：
1) blast-melted desulfurization, using oxygen top and bottom combined blown converter smelting into molten steel, is taken off using SiFe, MnFe alloy
Oxygen, and carry out alloying；Oxygen content≤the 60ppm of molten steel after deoxidation；
2) refine, using TiFe alloy final deoxidizings, keep oxygen content 10ppm, temperature control at 1595 DEG C~1565 DEG C, so
Argon gas (flow 1.0m is connected afterwards3/ min~2.0m3/ min) protection continuous casting, casting blank stacking slow cooling 36h, slab thickness 200mm；
3) roll, heating strand 1150 DEG C of temperature of section, firing rate 8min/cm；Rolled using the two-stage, rough rolling step is difficult to understand
Family name's body is recrystallized, 1110 DEG C of start rolling temperature, 1040 DEG C of roughing finishing temperature, workpiece thickness 120mm；Finish rolling stage austenite is not
Recrystallization, 930 DEG C of start rolling temperature, 780 DEG C of finish to gauge start rolling temperature；The steel plate of rolling thickness 50mm；
4) cold using ACC technique controls after rolling, cooling velocity 6 DEG C/S, Mulpic accelerate the upper and lower water of cooling to compare 1:1.80, steel plate
700 DEG C of red temperature；
5) steel plate of normalized condition delivery need to use normalizing+accelerated cooling process：850 DEG C of normalizing temperature, normalizing time
1.2min/mm, 5 DEG C/S of cooling velocity, 700 DEG C of steel plate red temperature.Finished product thickness 50mm is obtained, yield strength is 500MPa grades
Other forklift truck transverse beam steel plate special.
Embodiment 2
A kind of yield strength for 500MPa rank forklift truck transverse beam steel plate specials preparation method, the preparation method include with
Lower step：
1) blast-melted desulfurization, using oxygen top and bottom combined blown converter smelting into molten steel, is taken off using SiFe, MnFe alloy
Oxygen, and carry out alloying；Oxygen content≤the 60ppm of molten steel after deoxidation；
2) refine, using TiFe alloy final deoxidizings, keep oxygen content 40ppm, temperature control at 1595 DEG C~1565 DEG C, so
Argon gas (flow 1.0m is connected afterwards3/ min~2.0m3/ min) protection continuous casting, casting blank stacking slow cooling 36h, slab thickness 250mm；
3) roll, heating strand 1190 DEG C of temperature of section, firing rate 10min/cm；Rolled using the two-stage, rough rolling step
Austenite recrystallization, 1140 DEG C of start rolling temperature, 1070 DEG C of roughing finishing temperature, workpiece thickness 140mm；Finish rolling stage austenite
Non-recrystallization, 880 DEG C of start rolling temperature, 860 DEG C of finish to gauge start rolling temperature；The steel plate of rolling thickness 80mm；
4) cold using ACC technique controls after rolling, cooling velocity 8 DEG C/S, Mulpic accelerate the upper and lower water of cooling to compare 1:1.60, steel plate
660 DEG C of red temperature；
5) steel plate of normalized condition delivery need to use normalizing+accelerated cooling process：870 DEG C of normalizing temperature, normalizing time
1.4min/mm, 6 DEG C/S of cooling velocity, 660 DEG C of steel plate red temperature.Finished product thickness 80mm is obtained, yield strength is 500MPa grades
Other forklift truck transverse beam steel plate special.
Embodiment 3
A kind of yield strength for 500MPa rank forklift truck transverse beam steel plate specials preparation method, the preparation method include with
Lower step：
1) blast-melted desulfurization, using oxygen top and bottom combined blown converter smelting into molten steel, is taken off using SiFe, MnFe alloy
Oxygen, and carry out alloying；Oxygen content≤the 60ppm of molten steel after deoxidation；
2) refine, using TiFe alloy final deoxidizings, keep oxygen content 20ppm, temperature control at 1595 DEG C~1565 DEG C, so
Argon gas (flow 1.0m is connected afterwards3/ min~2.0m3/ min) protection continuous casting, casting blank stacking slow cooling 48h, slab thickness 300mm；
3) roll, heating strand 1230 DEG C of temperature of section, firing rate 11min/cm；Rolled using the two-stage, rough rolling step
Austenite recrystallization, 1170 DEG C of start rolling temperature, 1110 DEG C of roughing finishing temperature, workpiece thickness 160mm；Finish rolling stage austenite
Non-recrystallization, 840 DEG C of start rolling temperature, 830 DEG C of finish to gauge start rolling temperature；The steel plate of rolling thickness 120mm；
4) cold using ACC technique controls after rolling, cooling velocity 10 DEG C/S, Mulpic accelerate the upper and lower water of cooling to compare 1:1.10, steel
630 DEG C of plate red temperature；
5) steel plate of normalized condition delivery need to use normalizing+accelerated cooling process：900 DEG C of normalizing temperature, normalizing time
2.0min/mm, 8 DEG C/S of cooling velocity, 630 DEG C of steel plate red temperature.Finished product thickness 120mm is obtained, yield strength is 500MPa
The forklift truck transverse beam steel plate special of rank；
The steel plate produced in batches according to 1~embodiment of embodiment 3 is detected a flaw and mechanical properties test, the results are shown in Table 2.It is right
The steel plate of the production of 1~embodiment of embodiment 3 has also carried out submerged arc welding, and welding procedure and joint performance are shown in Table 3.
The mechanical property of steel plate of table 2 and flaw detection result
- 40 DEG C of impact flexibility of the steel plate submerged-arc welding process of table 3 and joint
Shown by table 2 and the result of table 3, the yield strength for using present invention production is 500MPa rank forklift truck transverse beam special-purpose steels
The welding performance that plate has excellent mechanical property, steel plate is fully met using the working condition with manufacturer, can be answered extensively
Field is manufactured for forklift truck transverse beam.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that to technical side of the invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right in the middle of.
Claims (3)
1. a kind of yield strength is the preparation method of 500MPa rank forklift truck transverse beam steel plate specials, and the preparation method includes as follows
Step：
1) blast-melted desulfurization, using oxygen top and bottom combined blown converter smelting into molten steel, deoxidation is carried out using SiFe, MnFe alloy,
And carry out alloying；Oxygen content≤the 60ppm of molten steel after deoxidation；
2) refine, using TiFe alloy final deoxidizings, keep oxygen content 10ppm~40ppm, temperature control is 1595 DEG C~1565
DEG C, argon gas is then turn on, protect continuous casting, casting blank stacking slow cooling 36h~48h, 200~300mm of slab thickness；
3) roll, heating strand 1150 DEG C~1230 DEG C of temperature of section, firing rate 8min/cm~11min/cm；Using the two-stage
Rolling, the steel plate of rolling thickness 50mm~120mm；
4) cold using ACC technique controls after rolling, 6 DEG C/s~10 DEG C of cooling velocity/s, Mulpic accelerates the upper and lower water ratio of cooling 1:1.1
~1:1.80 scopes, 630 DEG C~700 DEG C of steel plate red temperature；
5) normalizing+accelerated cooling process, 850 DEG C~900 DEG C of normalizing temperature, normalizing time 1.2min/mm~2.0min/mm is cold
But 5 DEG C/s~8 DEG C of speed/s, 630 DEG C~700 DEG C of steel plate red temperature, obtain yield strength for 500MPa rank forklift truck transverse beams
Steel plate special；
The chemical composition of the steel plate includes：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,
Remaining is Fe and is inevitably mingled with；
Carbon equivalent computing formula is：[CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] × 100%, carbon equivalent control exists
0.36%~0.40%.
2. a kind of yield strength according to claim 1 is the preparation method of 500MPa rank forklift truck transverse beam steel plate specials,
Characterized in that, step 2) in, argon flow amount 1.0m3/ min~2.0m3/min。
3. a kind of yield strength according to claim 1 is the preparation method of 500MPa rank forklift truck transverse beam steel plate specials,
Characterized in that, step 3) in, 1110 DEG C~1170 DEG C of roughing start rolling temperature, 1040 DEG C~1110 DEG C of roughing finishing temperature, in
Between base thickness 120mm~160mm；840 DEG C~930 DEG C of finish rolling start rolling temperature, 780 DEG C~850 DEG C of finish to gauge start rolling temperature.
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| 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 |
| CN109161799B (en) * | 2018-09-20 | 2020-04-14 | 山东钢铁股份有限公司 | Hot-rolled H-shaped steel for electrified railway contact net support and preparation method thereof |
| CN109930074B (en) * | 2019-04-09 | 2020-08-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Nb-containing steel for wagon combined brake beam with corrosion resistance and manufacturing method thereof |
| CN109930073B (en) * | 2019-04-09 | 2020-08-18 | 攀钢集团攀枝花钢铁研究院有限公司 | V, Ti-containing steel for railway wagon combined brake beam and manufacturing method thereof |
| 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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