CN103938092B - A kind of high-fatigue strength thermoforming heavy truck axle housing steel plate - Google Patents
A kind of high-fatigue strength thermoforming heavy truck axle housing steel plate Download PDFInfo
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- CN103938092B CN103938092B CN201410110348.6A CN201410110348A CN103938092B CN 103938092 B CN103938092 B CN 103938092B CN 201410110348 A CN201410110348 A CN 201410110348A CN 103938092 B CN103938092 B CN 103938092B
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Abstract
The present invention relates to a kind of high-fatigue strength thermoforming heavy truck axle housing steel plate and manufacture method thereof, its component by following mass percent forms, carbon 0.1-0.22%; Silicon 0.1-0.65%; Manganese 0.8-1.8%; Copper≤0.55%; Phosphorus≤0.025%; Sulphur≤0.003%; Niobium 0.012-0.06%; Vanadium 0.015-0.07%; Titanium 0.012-0.05%; Aluminium 0.012-0.045%; Chromium 0.1-0.55%; All the other are Fe and inevitable impurity, and the present invention has increased niobium vanadium alloy, crystal grain thinning Strengthening and Toughening, coordinate refining to remove impurity and pernicious gas, steel is purer, has reached excellent obdurability, by controlled rolling process processing, eliminate and organized internal stress, improve plasticity and toughness, there is good welding performance, degassed by desulfurization, significantly improve fatigue strength limit performance, improved service life.
Description
Technical field:
The present invention relates to a kind of steel plate and manufacture method thereof, more specifically a kind of high-fatigue strength thermoforming heavy truck axle housing steel plate and manufacture method thereof.
Background technology:
China's heavy truck is along with the market demand, gradually to alleviating chassis weight, reduce oil consumption, reducing discharge and pollute, improve transport power, extend the direction research and development such as heavy truck service life, comprising adopting high-strength steel to alleviate attenuate chassis automotive frame, axle housing steel plate. High fatigue, high strength easy welding heat roll axle housing steel plate and more and more come into one's own at present; Size to high tired, high strength easy welding steel plate for axle housing, chemical composition, mechanical property, etc. technical requirement make clearly regulation. Adopt yield strength to be greater than the high strength axle housing structure steel plate of 460MPa rank, replace low-level low-grade Q345B deadweight to reduce 7-9%, vehicle bridge is used service life to extend 5-7, adapt to modern heavy duty truck engineer operation construction demand, be beneficial to the raising of energy-saving and emission-reduction, enhancement of environment and whole society's technological progress and quality of life.
And the constituent of Q345B, preparation method and performance parameter: Q345B is except carbon silicomangan, do not contain valuable Nb vanadium chromium, only contain a small amount of titanium aluminium, in technique, do not adopt vacuum outgas to remove and be mingled with, phosphorus sulphur content is not up to 0.032% and 0.023%; In steel, oxygen nitrogen hydrogen content is higher, 60-70ppm respectively, 50-60ppm, 3-5ppm; Basic by hot rolling strengthening, yield strength is compared with the low 120MPa of Q460C, and fatigue strength is compared with the low 80MPa of Q460C. Be mainly that intensity own is low because of disappearance microalloy intensified element, steel impure cause fatigue strength and fatigue life low.
Therefore along with society and the development in market, Q345B shape steel plate more and more can not meet modern heavy duty truck axle housing and use, particularly for the heavy truck of 30-70 ton, all can not meet them yield strength, tensile strength and service life etc. of Q345B shape steel plate and use, therefore need in a hurry steel plate of a kind of superior performance and preparation method thereof.
Summary of the invention:
The object of the invention is for deficiency of the prior art, a kind of high-fatigue strength thermoforming heavy truck axle housing steel plate and manufacture method thereof are provided, especially the heavy truck that meets 30-70 ton uses, the present invention changes the deficiency of the technology such as low level Q345B and cast steel steel strength and fatigue life, design low-carbon (LC), high Mn content, add appropriate niobium vanadium titanium, with 0.18% chromium element, utilize external refining and degassed refining, improve Molten Steel Cleanliness, improve steel interior quality, provide a kind of process controlled rolling technology to improve steel strong, toughness, the method of fatigue strength and steel plate flatness, obtain pearlite, ferrite metallographic structure, the method efficiency is high, easy to operate, easily welding (Pcm≤0.23 and Ceq≤0.42%), plate shape flatness control meets manufacture and the use of modern heavy duty truck shell welding structure.
The present invention is achieved by the following technical solutions:
A kind of high-fatigue strength thermoforming heavy truck axle housing steel plate, is made up of carbon: 0.10-0.22% the component of following mass percent; Silicon: 0.10-0.65%; Manganese: 0.80-1.80%; Copper≤0.55%; Phosphorus≤0.025%; Sulphur≤0.003%; Niobium: 0.012-0.060%; Vanadium: 0.015-0.070%; Titanium: 0.012-0.050%; Aluminium: 0.012-0.045%; Chromium: 0.10-0.55%; All the other are Fe and inevitable impurity.
The thickness of above-mentioned steel plate is 10-16mm.
Pcm≤0.23 of above-mentioned steel plate, it has superior welding performance Ceq≤0.42 explanation.
The manufacture method of steel plate of the present invention comprises the steps: LF external refining; Protection adds the elements such as titanium aluminium; Vacuum outgas; Continuous casting; Heating of plate blank; Roughing; Finish rolling; Finish rolling plate shape is controlled; Leveling; Finished steel plate.
The concrete steps of the manufacture method of above-mentioned steel plate are:
(1) LF external refining: heat time 15-18 minute, make white slag desulfurization, add trace niobium vanadium titanium aluminum chromium;
(2) VD/RH vacuum outgas: vacuum 200Pa processes 18-22 minute below, argon gas soft blow 10 minutes after line feeding;
(3) heating of plate blank: soaking temperature scope 1100-1200 DEG C, soaking time scope 2.5-4.5 hour.
Suppress Austenite Grain Growth by Nb (CN) the TiN particle and the low-temperature heat that utilize small and dispersed, obtain tiny and uniform austenite crystal.
(4) roughing: start rolling temperature 1050-1150 DEG C, single pass reduction ratio is greater than 18%, by 7-9 passage recrystallization softening austenite crystal repeatedly.
(5) finish rolling: start rolling temperature scope 860-920 DEG C, finishing temperature 810-850 DEG C, single pass reduction ratio 15-18%. Impose in crystallization austenitic area not the aximal deformation value that is greater than 18%, make austenite crystal be drawn into Zona transformans.
(6) aligning: the glacing flatness≤3mm/m of steel.
Adopt the 2500 ton of 9 reciprocal 3-5 passage of roller straightener leveling steel plate.
The invention has the beneficial effects as follows: the present invention has increased the design of niobium vanadium alloy, crystal grain thinning Strengthening and Toughening, coordinate refining to remove impurity and pernicious gas element, steel is purer, phosphorus sulphur content is not reduced to 0.025% and 0.003%, reach excellent obdurability coupling, tough brittle transition temperature is below-20 DEG C, glacing flatness 1.7-2.5mm/m, get on the bus ten thousand fatigue lives of the actual 150-210 of reaching, the yield strength 510-560MPa of steel plate, tensile strength 620-720MPa, the controlled rolling process processing of passing through, making steel plate have high intensity has eliminated and has organized internal stress, improve plasticity and toughness index, percentage elongation can reach 17-22%, Pcm≤0.23, Ceq≤0.42, there is good welding performance, 0 DEG C of impact flexibility is greater than 47 joules, degassed by desulfurization, steel plate has significantly improved fatigue strength limit performance, improve service life, 12mm steel plate of the present invention replaces the 14mmQ345B weight reduction 7% of 890,000 fatigue lives, reach fatigue life 1,530,000 times, 14mm steel plate of the present invention substitutes the thick Q345B weight reduction 5% of 16mm of 1,000,000 fatigue lives, reaches fatigue life 2,110,000 times.
Brief description of the drawings
Fig. 1 is the embodiment of the present invention 1 gained steel plate metallographic structure schematic diagram;
Fig. 2 is the embodiment of the present invention 2 gained steel plate metallographic structure schematic diagrames;
Fig. 3 is the embodiment of the present invention 3 gained steel plate metallographic structure schematic diagrames.
Detailed description of the invention:
Below in conjunction with concrete embodiment, the invention will be further described, but be not construed as limiting the invention.
Embodiment 1
Slab melting composition is:
C:0.18%, Si:0.33%, Mn:1.65%, P:0.016%, S:0.001%, Nb:0.027%, V:0.045%, Ti:0.026%, Al:0.021%, Cr:0.32%; All the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1150; Soaking time (hour): 3.8; Roughing temperature (DEG C): 1100; Roughing single pass reduction ratio (%): 22; Finish rolling start rolling temperature (DEG C): 870; The finish rolling of finish rolling finishing temperature (DEG C): 820; Single pass reduction ratio (%): 18.
Mechanical property of steel plate:
Specification: steel plate thickness 12mm; Yield strength (MPa): 525; Tensile strength (MPa): 690; Elongation after fracture (%): 18; Clod wash: qualified; V-type impact of collision merit (0 DEG C): 119J, 123J, 126J, Pcm:0.22; Ceq:0.42.
Metallographic structure: ferrite adds pearlite.
Make axle housing and carry out finished product fatigue test, fatigue limit 1,530,000 times, fatigue strength 485MPa.
Embodiment 2
With above-mentioned steel billet material;
Slab soaking temperature (DEG C): 1120; Soaking time (hour): 3.5; Roughing temperature (DEG C): 1080; Roughing single pass reduction ratio (%): 21; Final rolling temperature (DEG C): 880; The finish rolling of finish rolling finishing temperature (DEG C): 820; Single pass reduction ratio (%): 18, Pcm:0.23; Ceq:0.41.
Mechanical property of steel plate:
Specification: steel plate thickness 16mm; Yield strength (MPa): 515; Tensile strength (MPa): 675; Elongation after fracture (%): 19; Clod wash: qualified; V-type impact of collision merit (0 DEG C): 132J, 136J, 129J;
Metallographic structure: ferrite adds pearlite;
Make axle housing and carry out finished product fatigue test, fatigue limit 1,520,000 times, fatigue strength 480MPa.
Embodiment 3
Slab melting composition is:
C:0.17%, Si:0.27%, Mn:1.55%, P:0.013%, S:0.001%, Nb:0.027%, V:0.045%, Ti:0.017%, Al:0.021%, Cr:0.36%; All the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1150; Soaking time (hour): 3.2; Roughing temperature (DEG C): 1120; Roughing single pass reduction ratio (%): 26; Finish rolling start rolling temperature (DEG C): 860; The finish rolling of finish rolling finishing temperature (DEG C): 820; Finish rolling single pass reduction ratio (%): 17.
Mechanical property of steel plate:
Specification: steel plate thickness 14mm; Yield strength (MPa): 535; Tensile strength (MPa): 685; Elongation after fracture (%): 18; Clod wash: qualified; V-type impact of collision merit (0 DEG C): 140J, 142J, 140J; Pcm:0.22, Ceq:0.40.
Metallographic structure: ferrite adds pearlite.
Make axle housing and carry out finished product fatigue test, fatigue limit 2,110,000 times, fatigue strength 480MPa.
There are embodiment 1-3 and Fig. 1-3 known, the metallographic structure of gained steel plate of the present invention is that ferrite adds pearlite, the yield strength 515-535MPa of its steel plate, tensile strength 675-690MPa, percentage elongation can reach 18-19%, Pcm≤0.23, Ceq≤0.42,0 DEG C of impact flexibility is greater than higher than 47 joules, can reach 142 joules, and service life greatly improve, and alleviated deadweight 7%, met the use of modern heavy duty truck axle housing.
Claims (1)
1. a high-fatigue strength thermoforming heavy truck axle housing steel plate, is made up of the component of following mass percent, C:0.17%, Si:0.27%, Mn:1.55%, P:0.013%, S:0.001%, Nb:0.027%, V:0.045%, Ti:0.017%, Al:0.021%, Cr:0.36%; All the other are Fe and inevitable impurity;
The thickness of above-mentioned steel plate is 14mm;
Pcm≤0.23 of above-mentioned steel plate, Ceq≤0.42;
The manufacture method of above-mentioned steel plate comprises the steps: LF external refining; Protection adds titanium aluminium element; Vacuum outgas; Continuous casting; Heating of plate blank; Roughing; Finish rolling; Finish rolling plate shape is controlled; Leveling; Finished steel plate;
The concrete steps of the manufacture method of above-mentioned steel plate are:
(1) LF external refining: heat time 15-18 minute, make white slag desulfurization, add trace niobium vanadium titanium aluminum chromium;
(2) VD/RH vacuum outgas: vacuum 200Pa processes 18-22 minute below, argon gas soft blow 10 minutes after line feeding;
(3) heating of plate blank: 1150 DEG C of soaking temperature scopes, soaking time scope 3.2 hours;
(4) roughing: 1120 DEG C of start rolling temperatures, single pass reduction ratio 26%, by 7-9 passage recrystallization softening austenite crystal repeatedly;
(5) finish rolling: 860 DEG C of start rolling temperature scopes, 820 DEG C of finishing temperatures, single pass reduction ratio 17%;
(6) aligning: the glacing flatness≤3mm/m of steel.
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| CN201410110348.6A CN103938092B (en) | 2014-03-24 | 2014-03-24 | A kind of high-fatigue strength thermoforming heavy truck axle housing steel plate |
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| CN201410110348.6A CN103938092B (en) | 2014-03-24 | 2014-03-24 | A kind of high-fatigue strength thermoforming heavy truck axle housing steel plate |
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| CN103938092B true CN103938092B (en) | 2016-05-11 |
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Families Citing this family (8)
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| CN104213019B (en) * | 2014-08-28 | 2016-07-06 | 首钢总公司 | A kind of 600MPa level automobile axle housing steel and production method thereof |
| CN105239013B (en) * | 2015-08-11 | 2017-07-18 | 首钢总公司 | A kind of cold machine-shaping axle housing steel and its manufacture method |
| CN106244919A (en) * | 2016-08-03 | 2016-12-21 | 唐山钢铁集团有限责任公司 | A kind of low-alloy high-strength punching press axle shell steel and production method thereof |
| CN106282791B (en) * | 2016-08-18 | 2018-07-06 | 武汉钢铁有限公司 | Low internal stress steel plate for automobile axle housing and its production method |
| CN106544585B (en) * | 2016-10-18 | 2018-11-20 | 安阳钢铁股份有限公司 | Plate and its production method in a kind of high intensity for Wide Band Oxygen Sensors automobile axle housing |
| CN112195403B (en) * | 2020-09-28 | 2021-11-19 | 首钢集团有限公司 | 700 MPa-grade hot-formed axle housing steel and preparation method thereof |
| CN113862565A (en) * | 2021-09-17 | 2021-12-31 | 北京首钢股份有限公司 | High-fatigue high-strength steel for axle housing of axle and preparation method of steel |
| CN115044834A (en) * | 2022-06-20 | 2022-09-13 | 西王金属科技有限公司 | Low-alloy high-strength steel and preparation method thereof |
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