CN109881100A - A kind of anti-corrosion spring steel and its production method of tensile strength >=2000MPa - Google Patents
A kind of anti-corrosion spring steel and its production method of tensile strength >=2000MPa Download PDFInfo
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Abstract
The invention belongs to spring steel and its field of production, more particularly to a kind of anti-corrosion spring steel and its production method of tensile strength >=2000MPa, its chemical component and weight percent are as follows: C 0.40~0.45%, Si 2.00~2.50%, Mn 0.40~0.60%, Cr 0.80~1.00%, V 0.20~0.30%, Ni 0.05~0.15%, Cu 0.05~0.15%, Re 0.01~0.03%, P trace~0.015%, S trace~0.015%, O≤0.0015%, N≤0.006%, [H]≤0.00015%, remaining is Fe and other inevitable impurity, its production method includes: to smelt, refining, Vacuum outgas, continuous casting, wire rod rolling route；After it is heat-treated, grain size >=10 grade of steel；After the heat treatment for carrying out+400 DEG C of tempering of 870 DEG C of quenchings, tensile strength >=2000MPa, elongation after fracture >=10%, the contraction percentage of area >=42%, anti-fatigue performance and elasticity attenuation resistance can be excellent, and have good corrosion resisting property.
Description
Technical field
The invention belongs to the anti-corrosion of spring steel and its field of production more particularly to a kind of tensile strength >=2000MPa
Spring steel and its production method.
Background technique
Spring steel is widely used in the machine-building such as railway, automobile, engineering machinery, along with the lightweight to motor vehicles
Change, high performance requirement are higher and higher, support the suspension of car body with spring also by high intensity.Furthermore domestic train speed-raising, goods
Vehicle develops to high-speed overload direction, the bogie spring that also there is an urgent need to intensity is high, light-weight, the service life is long.In addition, in some chlorine
The higher wet environment of ion concentration, such as coastal environments, it is also necessary to which spring components have good corrosion resisting property.
But while automotive suspension has been carried out high stress design with helical spring, further improve the strong of steel
Degree index has been very limited.Because commercial spring steel is when tensile strength is more than 1800MPa, material plasticity index is drawn
The contraction percentage of area Z (%) and elongation after fracture A (%) for stretching test have biggish decline (by existing standard oil Q-tempering bullet
Its contraction percentage of area of spring steel wire Φ 10.0mm or more can only achieve the then no standard of 30%, Φ 14.0mm or more), how into one
The quality of the raising spring steel of step is the unremitting pursuit of people.
With the continuous deepening of research, the prior art also discloses many high-strength spring steel and its production method, such as China
Patent CN103725984B discloses a kind of high-toughness high-strength spring steel, it is characterised in that the chemical component composition (weight of material
Measure percentage) are as follows: C 0.35~0.50, Si 1.50~2.50, Mn 0.35~1.00, P≤0.025, S≤0.015, Cr
0.50~1.20, Ni 0.15~0.50, Cu 0.10~0.30, V 0.04~0.10, Ti 0.03~0.10, remaining for Fe and
Other inevitable impurity.The grain size of the spring steel is 8.0 grades or more, and tensile strength is in 1920MPa or more, section
Shrinking percentage Z >=40%, elongation after fracture >=10%.But the intensity phase of the trades mark such as the spring steel tensile strength and national standard 55SiCrV
Than not being significantly increased, and do not have apparent corrosion resistance.
The present invention is directed in view of the above technical problems, provide the spring steel of tensile strength >=2000MPa a kind of, heat treatment
Afterwards, the grain size of steel is high, and the grain size of steel is thin, and intensity and plasticity are high, and anti-fatigue performance and elasticity attenuation resistance can be excellent, and have
There is good corrosion resisting property.
Summary of the invention
In order to achieve the above objectives, the present invention provides the anti-corrosion spring steel of tensile strength >=2000MPa a kind of, chemistry
Ingredient and weight percent are as follows: C 0.40%~0.45%, Si 2.00%~2.50%, Mn 0.40%~0.60%, Cr
0.80%~1.00%, V 0.20%~0.30%, Ni 0.05%~0.15%, Cu 0.05%~0.15%, Re 0.01%
~0.03%, P trace~0.015%, S trace~0.015%, O≤0.0015%, N≤0.006%, [H]≤0.00015%,
Remaining is Fe and other inevitable impurity.
Preferably, Si weight percent is 2.20%~2.50%.
Preferably, Mn weight percent is 0.50%~0.60%.
Preferably, Cr weight percent is 0.90%~1.00%.
Preferably, V weight percent is 0.25%~0.30%.
Preferably, Ni weight percent is 0.10%~0.15%.
Preferably, Cu weight percent is 0.10%~0.15%.
Preferably, Re weight percent is 0.015%~0.025%.
As preferred means, grain size >=10 grade of steel；After the heat treatment for carrying out+400 DEG C of tempering of 870 DEG C of quenchings, resist
Tensile strength >=2000MPa, elongation after fracture >=10%, the contraction percentage of area >=42%, by 10 samples with 60% or more probability
Occur 107The maximum load stress in the secondary above service life has good anti-corrosion as fatigue strength, fatigue strength >=800MPa
Performance.
The invention further relates to a kind of method of the anti-corrosion spring steel of tensile strength >=2000MPa, step packets
It includes:
(1) conventional electric furnace or converter smelting: oxygen, strict control tapping process slag are determined before tapping；
(2) conventional refinery furnace refines: the elements such as C, Si, Mn, Cr, V, Ni, Cu, Re are adjusted to target value；
(3) vacuum outgas: pure degassing time >=15 minute guarantee [H] content≤1.5ppm after being vacuum-treated；
(4) continuous casting: Baogang's water target temperature is 10~40 DEG C more than liquidus temperature in control, continuous casting 150mm × 150mm
~250mm × 250mm square billet；
(5) wire rod rolling route: 150mm × 150mm~250mm × 250mm square billet → strips off the skin → heats, and heating temperature is
950~1030 DEG C, preferably 980~1010 DEG C, square billet time inside furnace≤2h, preferably 90~110min → high-speed rod controlled rolling
The control of → Stelmor cooling line is cold → 12~25mm of Φ, preferably 16~22mm wire-rod roll finished product；Wherein when wire rod rolling, open rolling
Temperature is 890~930 DEG C, preferably 900~920 DEG C；Finishing temperature is 780~820 DEG C, preferably 800~820 DEG C；Spinning
Temperature is 810~830 DEG C, preferably 810~820 DEG C.
The effect and mechanism of each element and main technique in the present invention:
C: carbon is most basic effective intensified element in steel, in spring steel moderate heat hardness, ensures the important member of wear resistance
Element is necessary to obtaining high-intensitive and hardness spring steel.Excessively high carbon content is unfavorable for the plasticity and toughness of steel, and makes
Yield tensile ratio reduces, and the toughness of spring steel is greatly reduced, and reduces fatigue behaviour.In the present invention, C content control 0.40%~
0.45%.
Si: silicon is mainly solution strengthening effect in steel, is to influence maximum alloy to the elastoresistance of spring decline performance
Element.But the excessively high activity for making carbon of Si increases and promotes the decarburization of steel and be graphitized and influence the anti-fatigue performance of steel.But Si member
The raising of element will increase Carbon diffusion in steel, aggravate the decarburization of steel.In the present invention, the control of Si content 2.00%~
2.50%, preferably 2.20%~2.50%.
Mn: manganese and iron form solid solution, improve the hardness and strength of ferrite and austenite in steel, while Mn is to improve Austria
The stability of family name's body tissue significantly improves the harden ability of steel.But excessive Mn can reduce the plasticity of steel.The addition of Mn helps simultaneously
In forming corrosion layer in steel surface, the corrosion resisting property of steel is improved, but excessive Mn will lead to growing up for corrosion product particle, mention
High corrosion rate.In the present invention, the control of Mn content is 0.40%~0.60%, preferably 0.50%~0.60%.
Cr: chromium and carbon can form stable compound, prevent the segregation of C or impurity, improve the stability of matrix, significantly
The antioxidation for improving steel, increases the resistance to corrosion of steel.Chromium can dramatically increase the harden ability and elasticity attenuation resistance energy of steel, but mistake
The Cr of amount increases steel belt roof bolt brittleness tendency.In the present invention, the control of Cr content 0.80%~1.00%, 0.90%~
1.00%.
V: vanadium is the excellent deoxidier of steel, in steel plus vanadium can thinning microstructure crystal grain, it is compound in the form of tiny carbide
It is precipitated, improves the obdurability of spring steel, while hindering the dislocation migration of camber of spring Shi Gangzhong, improve elasticity attenuation resistance energy.V with
C forms carbide, and hydrogen attack resistance can be improved.In the present invention, V content control is 0.20%~0.30%, preferably
0.25%~0.30%.
Ni: nickel can generate the solid solution of infinitely dissolve with iron, have the function of expanding phase region, do not form carbide.Nickel energy
Stable austenite enhances the harden ability of steel.The addition of Ni element can improve Rust Layer Structure simultaneously, improve consistency and to steel surface
Caking property, improve the corrosion resisting property of steel.But excessive nickel is added in steel, and hot-short sexual orientation of the steel in hot environment increases
Add.In the present invention, the control of Ni content is 0.05%~0.15%, preferably 0.10%~0.15%.
Cu: outstanding role of the copper in steel is the corrosion resisting property for improving steel.The yin between Cu that steel and surface second are precipitated
Pole contact, can promote the anodization of steel, and form the preferable rusty scale of protectiveness.Copper can also change the hygroscopicity of rusty scale, from
And improve critical humidity.But Cu generates high crack sensitivity in steel.In the present invention, the control of Cu content 0.05%~
0.15%, preferably 0.10%~0.15%.
Re: suitable rare earth rhenium is added in steel, can make MnS, A12O3It is mingled with etc. being mingled with to go bad for rare earth, to improve steel
Mechanical property.Re is added in steel, fine and close complex rare-earth oxidate containing valuable metal continuous, adhesion is good can be formed.Suitable Re content passes through
Oxide type, the forming process for improving rusty scale, are remarkably improved the corrosion resistance of steel, and including promoting other microalloy elements
Enrichment in rusty scale.In addition, Re goes bad and is mingled with, so as to improve spot corrosion and intercrystalline corrosion by cleaning molten steel.Re is dissolved in steel
The corrosion resistance of steel matrix is improved, and promotes to stablize the formation of fine and close rusty scale.In the present invention, the control of Re content 0.01%~
0.03%, preferably 0.015%~0.025%.
S and P: Sulfur capacity forms MnS with manganese easily in steel and is mingled with, harmful to the twisting property of snap ring；P is that have strong segregation
The element of tendency usually also causes the common segregation of sulphur and manganese, harmful to the uniformity of product tissue and performance.In the present invention
In, control P≤0.015%, S≤0.015%.
O and N: oxygen forms oxide in steel and is mingled with, and in the present invention, controls T.O≤0.0015%；N is precipitated in steel
Fe4N, diffusion velocity is slow, causes steel to generate timeliness, while N can also reduce the cold-forming property of steel, in the present invention, controls N
≤ 0.006%.
H: hydrogen is most harmful element in steel, and hydrogen solubility in solid steel is minimum, molten steel is dissolved at high temperature, when cooling
Have little time to escape and gather and form the subtle stomata of high pressure in the tissue, drops the plasticity, toughness and fatigue strength of spring steel sharply
It is low, lead to the hydrogen embrittlement of spring steel, controls [H]≤0.00015%.
Compared with prior art, the present invention grain size >=10 grade of steel；At the heat for carrying out+400 DEG C of tempering of 870 DEG C of quenchings
After reason, tensile strength >=2000MPa, elongation after fracture >=10%, the contraction percentage of area >=42%, anti-fatigue performance and elasticity attenuation resistance
Can be excellent, and there is good corrosion resisting property, fully meet the production demand of high-strength spring in wet environment.
Specific embodiment
The present invention will be further described with reference to the examples below.Described embodiment and its result are merely to illustrate
The present invention, without the present invention described in detail in claims should will not be limited.
Various embodiments of the present invention press following technique production:
(1) conventional electric furnace or converter smelting: oxygen, strict control tapping process slag are determined before tapping；
(2) conventional refinery furnace refines: the elements such as C, Si, Mn, Cr, V, Ni, Cu, Re are adjusted to target value；
(3) vacuum outgas: pure degassing time >=15 minute guarantee [H] content≤1.5ppm after being vacuum-treated；
(4) continuous casting: Baogang's water target temperature is 10~40 DEG C more than liquidus temperature in control, continuous casting 150mm × 150mm
~250mm × 250mm square billet；
(5) wire rod rolling route: 150mm × 150mm~250mm × 250mm square billet → strips off the skin → heats, and heating temperature is
950~1030 DEG C, preferably 980~1010 DEG C, square billet time inside furnace≤2h, preferably 90~110min → high-speed rod controlled rolling
The control of → Stelmor cooling line is cold → 12~25mm of Φ, preferably 16~22mm wire-rod roll finished product；Wherein when wire rod rolling, open rolling
Temperature is 890~930 DEG C, preferably 900~920 DEG C；Finishing temperature is 780~820 DEG C, preferably 800~820 DEG C；Spinning
Temperature is 810~830 DEG C, preferably 810~820 DEG C.
Performance detection test:
Autstenitic grain size: 870 ± 20 DEG C of quenchings, oily cold, 18-35 DEG C of hardening media temperature carry out metallographic system after cooling
Sample and autstenitic grain size grading, grain size >=10.0 grade.
Wire rod: being processed as the standard tension sample of Φ 10mm by obdurability detection, using following quenching and tempering treatment technique:
870 DEG C of quenchings, oily cold, 18-35 DEG C of hardening media temperature, 400 DEG C of tempering, with air natural cooling, mechanical property after heat treatment
It is shown in Table 3.The intensity of embodiment reaches 2000MPa, and elongation reaches 10% or more, and reduction of area reaches 42% or more, says
Bright embodiment has preferable obdurability.
Fatigue strength detection: carrying out tempering of quenching to wire rod, superficial oxidation iron sheet is removed production sample, then carry out tired
Labor bend test.10 samples are occurred 10 with 60% or more probability7The maximum load stress in the secondary above service life is as fatigue
Intensity.Embodiment all has the excellent fatigue properties of fatigue strength 800MPa or more, and the fatigue strength of comparative example is only
751MPa。
Corrosion test: the corrosion resisting property in order to verify steel samples on the square billet of embodiment and comparative example respectively, passes through
After 870 DEG C of+400 DEG C of quenching and tempering treatments, according to GB/T 19746-2018, " the corrosion salting liquid week of metal and alloy soaks respectively
Test " and GB/T 10125-2012 " artificial atmosphere corrosion test salt spray test " method, carry out 288h weeks leaching corrosion test with
72h salt spray corrosion test, comparative example are that common high-strength spring steel, embodiment in contrast, are soaked and tested in week currently on the market
Relatively corrosive rate 50% or so, the relatively corrosive rate of salt spray test is lower than 47%.
Anti- bullet subtracts test: using to characterize embodiment with Bao Xinge torsion hysteresis loop method reverse back area under the curve obtained
With the sag resistance property of comparative example, the size of area can represent the size of material sag resistance property, and the elasticity attenuation resistance of embodiment can be bright
It is aobvious to be better than comparative example.
The chemical component and organized list (wt%) of 1 embodiment of the present invention of table and comparative example
The specific process parameter situation list of 2 embodiment of the present invention of table and comparative example
The performance text list of 3 embodiment of the present invention of table and comparative example
Claims (10)
1. a kind of anti-corrosion spring steel of tensile strength >=2000MPa, chemical component and weight percent are as follows: C 0.40%~
0.45%, Si 2.00%~2.50%, Mn 0.40%~0.60%, Cr 0.80%~1.00%, V 0.20%~
0.30%, Ni 0.05%~0.15%, Cu 0.05%~0.15%, Re 0.01%~0.03%, P trace~0.015%, S
Trace~0.015%, O≤0.0015%, N≤0.006%, [H]≤0.00015%, remaining for Fe and it is other inevitably
Impurity.
2. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: Si weight
Percentage is 2.20%~2.50%.
3. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: Mn weight
Percentage is 0.50%~0.60%.
4. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: Cr weight
Percentage is 0.90%~1.00%.
5. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: V weight hundred
Divide than being 0.25%~0.30%.
6. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: Ni weight
Percentage is 0.10%~0.15%.
7. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: Cu weight
Percentage is 0.10%~0.15%.
8. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: Re weight
Percentage is 0.015%~0.025%.
9. a kind of anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, it is characterised in that: the material
After heat treatment, grain size >=10 grade of steel；After the heat treatment for carrying out+400 DEG C of tempering of 870 DEG C of quenchings, tensile strength >=
2000MPa, elongation after fracture >=10%, the contraction percentage of area >=42%, fatigue strength >=800MPa, and there is good corrosion resistance
Energy.
10. producing a kind of method of the anti-corrosion spring steel of tensile strength >=2000MPa as described in claim 1, step
Include:
(1) conventional electric furnace or converter smelting: oxygen, strict control tapping process slag are determined before tapping；
(2) conventional refinery furnace refines: the elements such as C, Si, Mn, Cr, V, Ni, Cu, Re are adjusted to target value；
(3) vacuum outgas: pure degassing time >=15 minute guarantee [H] content≤1.5ppm after being vacuum-treated；
(4) continuous casting: in control Baogang's water target temperature 10~40 DEG C more than liquidus temperature, continuous casting 150mm × 150mm~
250mm × 250mm square billet；
(5) wire rod rolling route: 150mm × 150mm~250mm × 250mm square billet → strips off the skin → heats, heating temperature 950
~1030 DEG C, preferably 980~1010 DEG C, square billet time inside furnace≤2h, preferably 90~110min → high-speed rod controlled rolling →
Stelmor cooling line control is cold → 12~25mm of Φ, preferably 16~22mm wire-rod roll finished product；Wherein when wire rod rolling, open rolling temperature
Degree is 890~930 DEG C, preferably 900~920 DEG C；Finishing temperature is 780~820 DEG C, preferably 800~820 DEG C；Spinning temperature
Degree is 810~830 DEG C, preferably 810~820 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111321346A (en) * | 2020-03-05 | 2020-06-23 | 马鞍山钢铁股份有限公司 | Ultrahigh-strength spring steel with excellent hydrogen-induced delayed fracture resistance and production method thereof |
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| CN105121680A (en) * | 2013-04-23 | 2015-12-02 | 新日铁住金株式会社 | Spring steel having excellent fatigue characteristics and process for manufacturing same |
| CN108559910A (en) * | 2018-05-31 | 2018-09-21 | 马鞍山钢铁股份有限公司 | A kind of whole process TMCP thermal mechanical rolling 55SiCr spring steel and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003105485A (en) * | 2001-09-26 | 2003-04-09 | Nippon Steel Corp | High strength spring steel having excellent hydrogen fatigue cracking resistance, and production method therefor |
| CN101365820A (en) * | 2006-01-23 | 2009-02-11 | 株式会社神户制钢所 | High-strength spring steel excellent in brittle fracture resistance and method for producing same |
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| CN105121680A (en) * | 2013-04-23 | 2015-12-02 | 新日铁住金株式会社 | Spring steel having excellent fatigue characteristics and process for manufacturing same |
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| CN111321346A (en) * | 2020-03-05 | 2020-06-23 | 马鞍山钢铁股份有限公司 | Ultrahigh-strength spring steel with excellent hydrogen-induced delayed fracture resistance and production method thereof |
| CN111321346B (en) * | 2020-03-05 | 2021-12-24 | 马鞍山钢铁股份有限公司 | Ultrahigh-strength spring steel with excellent hydrogen-induced delayed fracture resistance and production method thereof |
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Application publication date: 20190614 |