CN109913767A - A kind of anti-corrosion spring steel and its production method of tensile strength >=2100MPa - Google Patents
A kind of anti-corrosion spring steel and its production method of tensile strength >=2100MPa 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 >=2100MPa, its chemical component and weight percent are as follows: C 0.57%~0.63%, Si 1.50%~2.00%, 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: smelting, refining, vacuum outgas, continuous casting, wire rod rolling route；After heat treatment, tensile strength >=2100MPa, grain size >=10 grade of steel, elongation after fracture >=13%, the contraction percentage of area >=45%, fatigue strength >=850MPa, and there is good corrosion resisting property, meet the needs of spring manufactures in wet environment.
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 >=2100MPa
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 >=2100MPa a kind of, heat treatment
Afterwards, the grain size of steel is high, and plasticity is strong, intensity is big, and has 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 >=2100MPa a kind of, chemistry
Ingredient and weight percent are as follows: C 0.57%~0.63%, Si 1.50%~2.00%, 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, C weight percent is 0.57%~0.60%.
Preferably, Cr weight percent is 0.90%~1.00%.
Preferably, V weight percent is 0.20%~0.25%.
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, after the material heat treatment, tensile strength >=2100MPa, grain size >=10 grade of steel are had no progeny
10 samples 10 with 60% or more probability by elongation >=13%, the contraction percentage of area >=45% occur7The secondary above service life is most
Heavy load stress has good corrosion resisting property as fatigue strength, fatigue strength >=850MPa.
The invention further relates to a kind of method of the anti-corrosion spring steel of tensile strength >=2100MPa, 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, Cr, Mn, V, Ni, Cu, Re are adjusted to target value；
(3) vacuum outgas: pure degassing time >=15 minute, guarantee be vacuum-treated after [H] content≤1.5ppm (i.e.≤
0.00015%)；
(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 980~1000 DEG C；Square billet time inside furnace≤2h, preferably 80~110min → high-speed rod controlled rolling
The control of → Stelmor cooling line is cold → 12~25mm of Φ, preferably 12~18mm wire-rod roll finished product, and 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 guarantee strong hardness, ensures the important of wear resistance
Element is necessary to obtaining high-intensitive and hardness spring steel.Although high carbon content to the intensity of steel, hardness, elasticity and
It is advantageous that bullet subtracts performance etc., but is unfavorable for the plasticity and toughness of steel, and reduce yield tensile ratio, and Decarburization Sensitivity increases, and deteriorates steel
Anti-fatigue performance and processing performance.In the present invention, C content control 0.57%~0.63%, preferably 0.57%~
0.60%.
Si: silicon is the important element strengthened in steel, the strong hardness for improving steel is acted on by solid solution, while improving spring steel
Decline drag.The stability of rusty scale can be improved in silicon, improves corrosion resisting property.But the raising of Si element will increase the expansion of carbon in steel
It dissipates, aggravates the decarburization of steel.In the present invention, the control of Si content is 1.50%~2.00%.
Mn: manganese and iron form solid solution, improve the hardness and strength of ferrite and austenite in steel, while Mn can be improved
The stability of austenite structure can also significantly improve the harden ability of steel.But excessive Mn can reduce the plasticity of steel.The addition of Mn
Facilitate to form corrosion layer in steel surface simultaneously, improves the corrosion resisting property of steel, but excessive Mn will lead to corrosion product particle
Grow up, improve rate of corrosion.In the present invention, the control of Mn content is 0.40%~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.Cr can dramatically increase the harden ability of steel, but excessive Cr has increase
Steel belt roof bolt brittleness tendency.In the present invention, the control of Cr content is 0.80%~1.00%, preferably 0.90%~1.00%.
V: vanadium is the excellent deoxidier of steel, adds vanadium can thinning microstructure crystal grain, raising intensity and toughness in steel.V and C forms carbon
Hydrogen attack resistance can be improved in compound.In the present invention, V content control 0.20%~0.30%, preferably 0.20%~
0.25%.
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.
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 O≤0.0015%；Nitrogen 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 after steel is heat-treated, tensile strength >=2100MPa, the grain sizes of steel >=
10 grades, elongation after fracture >=13%, the contraction percentage of area >=45%, fatigue strength >=850MPa, and there is good corrosion resisting property,
Meets the needs of spring manufactures in wet environment.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 be embodiment 2 autstenitic grain size figure, 10.5 grades of autstenitic grain size
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, Cr, Mn, 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 980~1000 DEG C, square billet time inside furnace≤2h, preferably 80~110min → high-speed rod controlled rolling
The control of → Stelmor cooling line is cold → 12~25mm of Φ, preferably 12~18mm wire-rod roll finished product, wire rod rolled tissue is shown in Table
1；Wherein when wire rod rolling, start rolling temperature is 890~930 DEG C, preferably 900~920 DEG C；Finishing temperature is 780~820 DEG C,
Preferably 800~820 DEG C；Laying temperature is 810~830 DEG C, preferably 810~820 DEG C.
Performance detection test:
Autstenitic grain size: 880 ± 30 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；Autstenitic grain size is shown in Table 1.
Wire rod: being processed as the standard tension sample of Φ 10mm by obdurability detection, using following quenching and tempering treatment technique:
880 DEG C of quenchings, oily cold, 18-35 DEG C of hardening media temperature, 450 DEG C of tempering, with air natural cooling, mechanical property after heat treatment
It is shown in Table 3.The intensity of embodiment reaches 2100MPa, and elongation reaches 13% or more, and reduction of area reaches 45% or more, says
Bright embodiment has preferable obdurability.
Fatigue strength detection: carrying out tempering of quenching to gren rod, and superficial oxidation iron sheet is removed and makes sample, then into
Row fatigue bending test.10 samples are occurred 10 with 60% or more probability7The maximum load stress conduct in the secondary above service life
Fatigue strength.Embodiment all has the excellent fatigue properties of fatigue strength 850MPa or more, and the fatigue strength of comparative example is only
For 763MPa.
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 880 DEG C of+450 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, carries out 288h weeks leaching corrosion test and 72h salt spray corrosion test, and comparative example is to commonly use currently on the market
High-strength spring steel, embodiment in contrast, the relatively corrosive rate of week leaching test 50% or so, salt spray test it is relatively rotten
Erosion rate is lower than 44%.
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 (9)
1. a kind of anti-corrosion spring steel of tensile strength >=2100MPa, chemical component and weight percent are as follows: C 0.57%~
0.63%, Si 1.50%~2.00%, 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 >=2100MPa as described in claim 1, it is characterised in that: C weight hundred
Divide than being 0.57%~0.60%.
3. a kind of anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, it is characterised in that: Cr weight
Percentage is 0.90%~1.00%.
4. a kind of anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, it is characterised in that: V weight hundred
Divide than being 0.20%~0.25%.
5. a kind of anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, it is characterised in that: Ni weight
Percentage is 0.10%~0.15%.
6. a kind of anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, it is characterised in that: Cu weight
Percentage is 0.10%~0.15%.
7. a kind of anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, it is characterised in that: Re weight
Percentage is 0.015%~0.025%.
8. a kind of anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, it is characterised in that: the material
After heat treatment, tensile strength >=2100MPa, grain size >=10 grade of steel, elongation after fracture >=13%, the contraction percentage of area >=
45%, fatigue strength >=850MPa, and there is good corrosion resisting property.
9. producing a kind of method of the anti-corrosion spring steel of tensile strength >=2100MPa as described in claim 1, step packet
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, Cr, Mn, 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 980~1000 DEG C, square billet time inside furnace≤2h, preferably 80~110min → high-speed rod controlled rolling →
Stelmor cooling line control is cold → 12~25mm of Φ, preferably 12~18mm 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111334708A (en) * | 2020-03-05 | 2020-06-26 | 马鞍山钢铁股份有限公司 | High-strength spring steel with tensile strength of more than or equal to 2250MPa and excellent fatigue performance and production method thereof |
| CN111690875A (en) * | 2020-06-29 | 2020-09-22 | 马鞍山钢铁股份有限公司 | Spring steel with good heat-resistant and impact-resistant properties and production method thereof |
| CN111748739A (en) * | 2020-06-29 | 2020-10-09 | 马鞍山钢铁股份有限公司 | Heat-resistant spring steel with tensile strength of more than 2100MPa and production method thereof |
| CN114807728A (en) * | 2022-06-30 | 2022-07-29 | 江苏省沙钢钢铁研究院有限公司 | 2100MPa grade spring steel wire and production method thereof |
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| CN102634735A (en) * | 2012-04-09 | 2012-08-15 | 广州市奥赛钢线科技有限公司 | Spring steel used for automobile suspension as well as preparation method and application thereof |
| 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 |
|---|---|---|---|---|
| CN111334708A (en) * | 2020-03-05 | 2020-06-26 | 马鞍山钢铁股份有限公司 | High-strength spring steel with tensile strength of more than or equal to 2250MPa and excellent fatigue performance and production method thereof |
| CN111690875A (en) * | 2020-06-29 | 2020-09-22 | 马鞍山钢铁股份有限公司 | Spring steel with good heat-resistant and impact-resistant properties and production method thereof |
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| CN114807728A (en) * | 2022-06-30 | 2022-07-29 | 江苏省沙钢钢铁研究院有限公司 | 2100MPa grade spring steel wire and production method thereof |
| CN114807728B (en) * | 2022-06-30 | 2022-11-18 | 江苏省沙钢钢铁研究院有限公司 | 2100MPa grade spring steel wire and production method thereof |
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Application publication date: 20190621 |