CN112981255A - Pickling and EPS steel plate for automobile hollow stabilizer bar steel pipe and manufacturing method thereof - Google Patents
Pickling and EPS steel plate for automobile hollow stabilizer bar steel pipe and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 239000003381 stabilizer Substances 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000005554 pickling Methods 0.000 title claims description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 229910052796 boron Inorganic materials 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 14
- 238000009749 continuous casting Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 abstract description 4
- 238000005261 decarburization Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000010936 titanium Substances 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000712 Boron steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/028—Slabs
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Hollow stability of automobileThe acid-washing EPS steel plate for the fixed-rod steel pipe and the manufacturing method thereof are characterized in that the steel pipe comprises the following components in percentage by weight: 0.30 to 0.42 percent of C, less than or equal to 0.050 percent of Si, 1.20 to 1.50 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.015 to 0.040 percent of Als0.08 to 0.40 percent of Cr0.015 to 0.050 percent of Nb0.010 to 0.080 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.004 percent of N, and the balance of Fe and inevitable impurities. The invention is mainly used for manufacturing the transverse stabilizer bar of the passenger car to prevent the car from turning over when the car turns. The invention has good tube forming property and hardenability, no decarburization is generated on the surface of the steel plate, the full martensite structure can be obtained by heat treatment after tube making, and the tensile strength can reach 1700N/mm2The above.
Description
Technical Field
The invention relates to the technical field of metal materials and steel rolling, in particular to an acid-washed EPS steel plate for a steel pipe of an automobile hollow stabilizer bar and a manufacturing method thereof.
Background
The automobile transverse stabilizer bar is widely applied to an independent suspension, has the functions of preventing the automobile from turning over when turning or the left/right wheels are subjected to different loads, improves the operation stability of the automobile, can improve the riding comfort of the automobile, and can be designed into a hollow stabilizer bar according to the stress characteristics of the stabilizer bar in actual work to obtain a weight reduction effect of 30-45 percent, so that the hollow stabilizer bar becomes a research hotspot in the field of the conventional stabilizer bar.
The solid stabilizer bar is mainly made of spring steel and is mainly made of: 60Si2Mn (SUP7), 60Si2MnA, 55CrMn, 50CrVA, etc. The specification of the material is generally different from that of round steel with the diameter of 18mm to 40 mm. The material is forged, processed, heat treated and the like to manufacture the automobile stabilizer bar. In order to reduce the weight of automobiles, germany, japan and other enterprises currently manufacture hollow stabilizer bars from steel sheets having good hardenability. Some spring manufacturers in China are also manufacturing hollow stabilizer bars, but all adopt imported stabilizer bar steel pipes, and simultaneously try-manufacture of domestic steel pipes, and at present, the hollow stabilizer bar steel plates applied in batches are not reported.
Patent application No. 201710328672.9, "a fatigue resistant steel pipe material for an automotive hollow stabilizer bar", provides alloy components of the steel pipe material and provides a weight reduction effect achieved by manufacturing the hollow stabilizer bar, but the components thereof contain more noble metal elements, particularly Mo element, which inevitably leads to increase of material cost; patent application No. 201710761716.7 "a steel pipe for a hollow stabilizer bar of an automobile and a method for manufacturing the same" also provides a material composition of the steel pipe, which contains a large amount of precious metals and still has a high cost.
Disclosure of Invention
The invention aims to provide a pickling EPS steel plate for an automobile hollow stabilizer bar steel pipe and a manufacturing method thereof. The steel plate has excellent surface quality, good forming performance, no oxidation decarburized layer and good hardenability; the heat treatment strength of the steel plate after forming and pipe welding can reach more than 1700MPa, and the steel plate is used for automobile stabilizer bar components.
In order to achieve the purpose, the invention adopts the following technical scheme:
the acid-washing EPS steel plate for the automobile hollow stabilizer bar steel pipe comprises the following components in percentage by weight: 0.30 to 0.42 percent of C, less than or equal to 0.050 percent of Si, 1.20 to 1.50 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.015 to 0.040 percent of Als, 0.08 to 0.40 percent of Cr, 0.015 to 0.050 percent of Nb, 0.010 to 0.080 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.004 percent of N, and the balance of Fe and inevitable impurities.
Description of the action of the alloy elements:
carbon mainly determines hardenability of steel and is an element forming martensite. In medium and low carbon steel, the CCT curve of the steel is shifted to the right along with the increase of the carbon content, the hardenability of the steel is increased, but the effect is very small compared with elements such as manganese, chromium, boron and the like. The carbon content is increased, the AC3 point is lowered, austenite formation at low temperature is promoted, quenching treatment is facilitated, and in addition, the C content of more than 0.42 wt% causes quenching cracking tendency. The optimal C content is between 0.3 and 0.4 weight percent.
Si is an element for improving the hardenability and the strength of the steel plate, but the surface quality of the hot rolled steel plate is influenced by too high Si, so the invention adopts the design of lower Si component.
Manganese is an element that expands the austenite region, increases the amount of manganese, improves hardenability, and is very effective for stabilizing strength after quenching. The Mn content is increased, the AC3 point is reduced, the austenite is promoted to form at low temperature, the quenching treatment is facilitated, and the optimal Mn content is 1.20-1.50%.
Cr is an effective element for improving the hardenability of steel and, after quenching, contributing to stable securing of strength. The optimal Cr content is between 0.08 and 0.40 percent.
Titanium is mainly used for fixing nitrogen in boron steel so as to ensure that the through-hardening effect of boron is exerted. In addition, the toughness of the quenched part is improved. However, if the Ti content is less than 0.010%, the effect is not significant, and if the Ti content exceeds 0.10%, saturation is reached, and the effect is not significant and the cost increases. Preferably, the Ti content is between 0.010% and 0.080%.
Niobium can improve the recrystallization temperature of steel, is a refined grain strengthening and precipitation strengthening element, and has the main function of refining grains and making the structure uniform, and the preferable Nb content is 0.015-0.050%.
The hardenability can be obviously improved by adding boron into the steel. The stability of the strength can be ensured after quenching. When the content of B is less than 0.001%, the effect is not significant, and when the content of B is more than 0.005%, the excessive B and N in the steel form a B compound, which degrades the performance of the steel sheet. The content of B in the steel is preferably between 0.001% and 0.005%.
S, P is an element which has an adverse effect on the properties of the steel sheet, and the lower the steel sheet, the better the steel sheet can be produced.
Al is a deoxidizing element in steel and has a certain strengthening effect, but the Al is higher than a determined upper limit, so that smelting production is difficult, and the cost is increased.
In the steel for hot stamping containing B, the lower the content of N, the better, but too low causes difficulty in production and increases cost, and therefore, the upper limit or less is secured.
The thickness of the steel plate is 2.5mm-8.0 mm.
The microstructure of the steel for the steel pipe of the stabilizer bar of the invention should have uniform ferrite and pearlite structures (see fig. 1), and the surface of the steel plate is free from decarburization (see fig. 2), and the prior austenite grain size of the steel plate is more than 8 grades; the steel plate has the following properties: relIs 300-500N/mm2、RmIs 550-750N/mm2、A80≥14％。
A manufacturing method of an acid-washing EPS steel plate for an automobile hollow stabilizer bar steel pipe comprises the following steps:
1) smelting control: adopting a conventional converter for smelting, and in order to ensure the purity of steel and control the content of N, S elements, N is less than or equal to 0.0040 and S is less than or equal to 0.0050; molten steel RH and LF external refining treatment is adopted; in order to ensure that the casting blank has uniform structure and no center segregation, light reduction and electromagnetic stirring equipment are put into the continuous casting process for treatment;
2) and (3) rolling control: heating the continuous casting blank to 1100-1200 ℃, preserving heat for 2-3 hours, then carrying out rough rolling, directly carrying out finish rolling without waiting for temperature after rough rolling, wherein the finish rolling temperature is 840-930 ℃, cooling to the coiling temperature at a cooling speed of more than 15 ℃/s by adopting front-section laminar flow after rolling, and the coiling temperature is 600-650 ℃; in order to ensure that the original austenite grain size of the steel plate is more than 8 grades, the heating of the steel billet adopts the low-temperature and short-time heat preservation design; in order to ensure the heating of reducing atmosphere, the air-fuel ratio of the heating section of the heating furnace is as follows: 2.0-2.1:1, soaking zone air-fuel ratio: 1.8-1.9: 1, thereby avoiding billet decarburization;
3) pickling and oiling the steel strip with the thickness of less than or equal to 5.0mm after hot rolling to obtain a hot-rolled pickled plate finished product;
the production route of the hot-rolled pickled plate is as follows: converter smelting → external refining → slab continuous casting → heating → rolling → coiling → acid cleaning → oiling → packaging;
removing the iron scale of the steel plate from the steel strip which is more than 5.0mm after hot rolling through an EPS treatment process, and coating oil and packaging to obtain a finished product of the hot-rolled EPS plate;
hot rolling of EPS-treated sheet: converter smelting → external refining → slab continuous casting → heating → rolling → coiling → EPS unit → oiling → packaging.
EPS (eco Pickled surface) eco-friendly Pickled surface: the physical rust removal technology is a physical rust removal technology for removing iron scales on the surfaces of a steel plate and a steel belt by using a special medium formed by mixing water, angle steel grit and a water-based rust inhibitor, and can treat the steel plate with the maximum thickness of 13 mm.
A heat treatment process for an automobile hollow stabilizer bar steel pipe is characterized in that the steel pipe is prepared from an automobile hollow stabilizer bar steel pipe through acid pickling and an EPS steel plate, heating is carried out at the temperature of 850-900 ℃, the heat preservation time is 5-15 min, and then water quenching is carried out to room temperature.
The steel pipe with the full martensite structure is obtained through heat treatment, and the tensile strength is 1700N/mm2The above.
Compared with the prior art, the invention has the beneficial effects that:
the steel for the steel pipe of the stabilizer bar is mainly used for manufacturing a transverse stabilizer bar of a passenger car so as to prevent the car from turning over when the car turns.
The steel plate provided by the invention has good pipe-making formability and hardenability, the substrate structure is ferrite and pearlite, the surface of the steel plate is not decarburized, the decarburized layer is 0, the steel plate can obtain a full-martensite structure after pipe-making and heat treatment, and the tensile strength can reach 1700N/mm2The above. The stabilizer bar is an ideal material for the transverse stabilizer bar of the automobile, and the hollow stabilizer bar replaces the traditional solid stabilizer bar, so that the effects of reducing weight and saving energy of the automobile can be achieved.
Drawings
FIG. 1 is a microstructure view (X100) of a steel sheet;
FIG. 2 is a cross-sectional profile (x 100) of the steel plate.
Detailed Description
The following examples further illustrate embodiments of the present invention.
As a raw material for a steel pipe of an automobile hollow stabilizer bar, hot rolling a steel plate, and then producing a hot-rolled pickled plate or a hot-rolled EPS surface treatment plate, wherein the steel plate with the thickness of less than or equal to 5.0mm is subjected to pickling process treatment, and the steel plate with the thickness of less than or equal to 8.0mm and less than or equal to 5.0mm is subjected to EPS process surface treatment.
The hot-rolled pickled plate process route is as follows: converter smelting → external refining → slab continuous casting → heating → rolling → coiling → acid washing → oiling → packaging.
The process route of the hot-rolled EPS treatment plate is as follows: converter smelting → external refining → slab continuous casting → heating → rolling → coiling → EPS unit → oiling → packaging.
The steel grades of the steel sheets of the examples have the melting compositions shown in table 1;
table 1 examples steel plate chemistry wt%
In the embodiment, the continuous casting blank is heated, heat-preserved, roughly rolled and finely rolled, laminar cooling is adopted after rolling, the steel strip is cooled to the coiling temperature at a corresponding cooling speed, and the steel strip after hot rolling is packaged after acid pickling or EPS surface treatment and oil coating; the specific rolling schedule is shown in Table 2. Table 3 shows the heat treatment process of the steel pipe for the hollow stabilizer bar.
TABLE 2 Rolling Process of Steel sheet for stabilizer Bar
TABLE 3 Heat treatment process of steel pipe for hollow stabilizer bar
The properties of the steel sheets of examples are shown in Table 4;
TABLE 4 Properties of the steel sheets of examples
The properties of the steel pipes of the examples after heat treatment are shown in Table 5, and the tensile strength reaches 1700N/mm2The above.
TABLE 5 post heat treatment Properties of hollow stabilizer Steel tube
| Steel grade | Rp0.2，N/mm2 | Rm，N/mm2 |
| 1-1 | 1200 | 1750 |
| 1-2 | 1210 | 1850 |
| 2-1 | 1250 | 1820 |
| 2-2 | 1230 | 1720 |
| 3-1 | 1260 | 1730 |
| 3-2 | 1210 | 1820 |
| 4-1 | 1230 | 1830 |
| 4-2 | 1270 | 1870 |
| 5-1 | 1280 | 1860 |
| 5-2 | 1255 | 1810 |
Note: the steel numbers "1-", "2-", "3-", "4-", and "5-" in tables 2, 3, 4, and 5 correspond to the steel sheets rolled in the original steel numbers 1, 2, 3, 4, and 5 of table 1, respectively.
Claims (6)
1. The acid-washed EPS steel plate for the automobile hollow stabilizer bar steel pipe is characterized in that the steel pipe comprises the following components in percentage by weight: 0.30 to 0.42 percent of C, less than or equal to 0.050 percent of Si, 1.20 to 1.50 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.015 to 0.040 percent of Als, 0.08 to 0.40 percent of Cr, 0.015 to 0.050 percent of Nb, 0.010 to 0.080 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.004 percent of N, and the balance of Fe and inevitable impurities.
2. The pickled and EPS steel plate for the automotive hollow stabilizer bar steel tube as claimed in claim 1, wherein the steel plate has a thickness of 2.5mm-8.0 mm.
3. The acid-washed EPS steel plate for the automotive hollow stabilizer bar steel tube according to claim 1, wherein the original austenite grain size of the steel plate is more than grade 8; the steel plate has the following properties: relIs 300-500N/mm2、RmIs 550-750N/mm2、A80≥14％。
4. A method for manufacturing a pickled, EPS steel sheet for an automotive hollow stabilizer bar steel pipe according to claim 1 or 2, characterized by comprising the steps of:
1) smelting control: molten steel RH and LF external refining treatment is adopted; putting the steel into a soft press and an electromagnetic stirring device for treatment during continuous casting;
2) and (3) rolling control: heating the continuous casting blank to 1100-1200 ℃, preserving heat for 2-3 hours, then carrying out rough rolling, directly carrying out finish rolling without waiting for temperature after rough rolling, wherein the finish rolling temperature is 840-930 ℃, cooling to the coiling temperature at a cooling speed of more than 15 ℃/s by adopting front-section laminar flow after rolling, and the coiling temperature is 600-650 ℃; air-fuel ratio of heating section of heating furnace: 2.0-2.1:1, soaking zone air-fuel ratio: 1.8-1.9: 1;
3) pickling and oiling the steel strip with the thickness of less than or equal to 5.0mm after hot rolling to obtain a hot-rolled pickled plate finished product;
and removing the iron scale of the steel plate from the steel strip which is more than 5.0mm after hot rolling through an EPS treatment process, and coating oil and packaging to obtain a finished product of the hot-rolled EPS plate.
5. A heat treatment process for an automobile hollow stabilizer bar steel pipe is characterized in that the steel pipe is prepared from the automobile hollow stabilizer bar steel pipe according to claim 1 through acid pickling and EPS steel plate, heating to 850-900 ℃, keeping the temperature for 5-15 min, and then water quenching to room temperature.
6. The heat treatment process of the steel pipe of the hollow stabilizer bar of the automobile as claimed in claim 5, wherein the steel pipe with the full martensite structure is obtained through heat treatment, and the tensile strength is 1700N/mm2The above.
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Application publication date: 20210618 |