CN106480372A - Non-quenched and tempered cold-heading steel wire rod for 8.8-grade fastener and production method thereof - Google Patents
Non-quenched and tempered cold-heading steel wire rod for 8.8-grade fastener and production method thereof Download PDFInfo
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- CN106480372A CN106480372A CN201510548362.9A CN201510548362A CN106480372A CN 106480372 A CN106480372 A CN 106480372A CN 201510548362 A CN201510548362 A CN 201510548362A CN 106480372 A CN106480372 A CN 106480372A
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- 239000010959 steel Substances 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000000930 thermomechanical effect Effects 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 229910001562 pearlite Inorganic materials 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 229910001339 C alloy Inorganic materials 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910004688 Ti-V Inorganic materials 0.000 description 1
- 229910010968 Ti—V Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a non-quenched and tempered cold heading steel wire rod for an 8.8-grade fastener, which is characterized by comprising the following components in percentage by weight: [C] 0.25 to 0.30 percent of Si, 0.40 to 0.60 percent of Mn, 1.10 to 1.30 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.10 to 0.15 percent of Cr, 0.06 to 0.10 percent of V, 0.01 to 0.03 percent of Ti, and the balance of Fe, wherein the content of inevitable impurities is not higher than 0.1 percent.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, it is related to a kind of 8.8 grades of securing member non-quenched cold heading steel wire rods and its producer
Method.
Background technology
Generally high-intensity fasteners (8.8 grades and more than) are produced using medium carbon steel or middle low-carbon alloy steel wire rod, due to medium carbon steel and
Low-alloy steel has good toughness, the steel wire gently drawing after spheroidizing, has the characteristics that resistance of deformation is low, cold upset forming is good,
But the tensile strength of wire after cold forming is usually no more than 700MPa, need to obtain back by quenched (quenching-high tempering) process
Fiery sorbite tissue, can be only achieved the mechanical property needed for high-strength bolt.
High-intensity fasteners are produced using medium carbon steel or middle low-carbon alloy steel wire rod, before cold-drawn and cold upset forming, needs to be consumed
When, power consumption spheroidizing process, and cold-drawn shape after need to carry out modifier treatment, complex manufacturing, time consumption and energy consumption.
Therefore using cold work reinforced type non-hardened and tempered steel wire rod to manufacture high-strength bolt product can save the spheroidizing before cold-drawn process and
Modifier treatment after shaping, considerably simplify production process, shortens the production cycle, reduces energy resource consumption, with
When the problems such as also avoid the surface oxidation causing because of heat treatment, decarburization and workpiece and deform, thus there is significant economic benefit
And social benefit.
Non-quenched cold heading steel is the new varieties developed in recent years, wire rod cold drawn front do not carry out spheroidizing process, securing member cold-heading becomes
Without carrying out quenched (quenching Gao-temperature tempering) process after shape, can reach all good effect of obdurability as long as carrying out low temperature aging and processing
Really, be mainly used in replacing medium carbon steel and middle low-carbon alloy steel, manufacture intensity rank be 8.8 grades, 9.8 grades and 10.9 grades even
12.9 grade high-strength fasteners.At present, cold-heading non-hardened and tempered steel is broadly divided into ferrite-pearlite type, bainite type and geneva
Build, wherein 8.8,9.8 grades of securing members mainly use ferrite+pearlite type non-quenched cold heading steel, 10.9 grades and above securing member
Substantially bainite type or martensite type non-quenched cold heading steel are used.
Technical scheme
The technical problem to be solved there is provided a kind of 8.8 grades of securing member non-quenched cold heading steel wire rods, by alloy
The careful design of composition, cooperation smeltings, continuous casting, tandem rolling and wire rod cooling controlling and rolling controlling process, realize the accurate of wire rod tissue and performance
Control, 8.8 grades of securing members of production with non-quenched cold heading steel wire rod composition uniformly, are organized as ferrite+pearlite, intensity and plasticity
Excellent, satisfaction produces 8.8 grade high-strength fasteners using non-tempering process.
The feature of the present invention be by composition design with reference to production technology produce satisfaction 8.8 grade high-strength fastener Micro Alloying cold
Upsetting steel wire rod, the composition of the wire rod being related to is：[C]:0.25%～0.30%, [Si]:0.40%～0.60%, [Mn]:1.10%～
1.30%, [P]≤0.020%, [S]≤0.015%, [Cr]:0.10%～0.15%, [V]:0.06%～0.10%,
[Ti]:0.01%～0.03%, inevitable impurity is not higher than 0.1%, and remaining is ferrum.
The range set reason of these compositions is as described below：
C content increases, and the intensity of steel and hardness raise, and plasticity and toughness reduce, and on the basis of proof strength, reduces carbon
Content is conducive to improving the toughness of steel and cold-forming property, therefore controls carbon C 0.25%～0.30%.
Si is ferrite former, the notable reinforced ferrite of energy, increases ferrite volume fraction in steel, fining ferrite is brilliant
Grain, though Si too high levels are conducive to the raising of intensity, but can make the toughness of steel decline, and so that cold upset forming difficulty is increased, because
This, under the conditions of ensureing tensile strength, should reduce its content, therefore control Si 0.40%～0.60%.
Mn is to improve non-hardened and tempered steel intensity, improves the important alloying element of non-hardened and tempered steel toughness, the main table of invigoration effect of Mn
Increase now with Mn content, perlitic transformation temperature constantly reduces, transition temperature reduces and means the pearlite that air cooling obtains
Group is more tiny, and pearlite interlamellar spacing is less, and in pearlite, carburizing piece is accordingly thinning, and the obdurability of steel is improved；Simultaneously in steel
Pearlite volume fraction is consequently increased, and the cold-forming property of steel decreases, and therefore controls Mn 1.10%～1.30%.
Phosphorus, sulfur are all objectionable impurities elements in steel, and phosphorus can separate out the very big Fe of fragility in steel3P, intensity carries at room temperature to make steel
Height, fragility increases, that is, increase the cold brittleness of steel.Sulfur does not almost dissolve in ferrum, and forms FeS with ferrum, and FeS is formed with Fe
The eutectic of low melting point, in hot-working, due to being distributed in the eutectic of crystal boundary, easily thawing leads to ftracture, that is, increase the hot-short of steel
Property.For ensureing that wire rod has good performance it is desirable to [P]≤0.020%, [S]≤0.015% in steel, do not causing other influences
In the case of, more low better.
Cr, with solution strengthening mode reinforced ferrite and pearlite, has the effect of refinement pearlite interlamellar spacing, increases the strong of steel
Toughness；Cr strongly reduces bainite transformation temperature, promotes the C curve of steel to move to right, and is decomposed into perlitic transformation and bayesian
Body changes two parts, can effectively improve the quenching degree of steel, therefore control Cr 0.10%～0.15%.
Effect in steel for the V is mainly crystal grain thinning, by the disperse educt of its carbonitride particle and the solid solution of V, greatly
Ground improve steel obdurability, V in steel in addition to grain refining intensificatiom, also very strong precipitation enhancement, the carbide of V,
Nitride and carboritride generation temperature range ratio are relatively low, and dissolubility is high, separates out wide ranges.V suppresses austenite at high temperature
The effect that crystal grain is grown up is smaller, but under low temperature in ferrite disperse educt, the contribution of precipitation strength is maximum, therefore by V
Control 0.06%～0.10%.
Effect in steel for the Ti is mainly crystal grain thinning, by the disperse educt of its carbonitride particle and the solid solution of Ti, greatly
Ground improves the obdurability of steel, Ti in steel in addition to grain refining intensificatiom, also very strong precipitation enhancement, multiple in Ti-V
Close in strengthening steel, Ti (CN) is preferential to be separated out, and V is subsequently deposited on the chemical combination of Ti, forms stable (TiV) (CN) particle, can
Obtain the good non-hardened and tempered steel of obdurability.Separate out because Ti (CN) is preferential, part C and N can be taken, make the V (CN) subsequently forming
Middle N dilution, reduces precipitation strength effect, so Ti content is unsuitable too high, Ti content excessively also can reduce the toughness of steel, because
This controls Ti 0.01%～0.03%.
The 8.8 grade high-strength fasteners non-quenched cold heading steel wire rod technological process of production：Molten iron pretreatment-converter smelting-LF stove essence
Refining-bloom continuous casting-tandem rolling cogging-wire rod heating, rolling, control are cold.Converter adopt double slag process smelt, slag-stopping tapping, control into
LF stove P≤0.010%；LF stove makes high basicity slag depth desulfurization, submerged arc heating, Argon, alloying；Continuous casting square billet specification 280
× 380mm, 25 DEG C -30 DEG C of the Metal in Tundish degree of superheat, electromagnetic agitation electric current 400-450A, pulling rate 0.6-0.7m/min；Line
Material rolling adopts thermo-mechanical rolling technique, wire rod heating-up temperature 1100-1200 DEG C, rolls into 800 DEG C -820 DEG C of finish rolling, spins
750 DEG C -780 DEG C of temperature, roller table speed 6-9m/min, front 2～4 thermal insulation covers are opened, and remaining thermal insulation cover is closed, and blower fan is whole
Close, by obtaining using the cold technique of the rolling control, there is thin ferrite and degenerate perlite tissue, this tissue has well
Cold-workability and toughness, meet 8.8 grade high-strength Micro Alloying securing member production requirements.
8.8 grades of securing member non-quenched cold heading steel wire rods of the present invention, can save securing member and produce the annealing before cold-drawn and become
Modifier treatment after shape, simplifies production process, shortens the production cycle, reduces energy resource consumption, also avoid because of heat simultaneously
The problems such as surface oxidation, decarburization and the workpiece processing and causing deforms, thus there is significant economic benefit and social benefit.
Specific embodiment
Below by some embodiments, the present invention is further described.
Converter adopts double slag process to smelt slag-stopping tapping, controls into LF stove P≤0.010%；The depth desulfurization of LF stove high basicity slag, submerged arc
Heating, Argon, alloying；Continuous casting square billet specification 280 × 380mm, 25 DEG C -30 DEG C of the Metal in Tundish degree of superheat, electromagnetism stirs
Mix electric current 400-450A, pulling rate 0.6-0.7m/min；Wire rod heating-up temperature 1150-1200 DEG C, wire rod rolling enters 800 DEG C of finish rolling
- 820 DEG C, 750 DEG C -780 DEG C of laying temperature, roller table speed 6-9m/min, 1#-2#Thermal insulation cover is opened, and remaining thermal insulation cover is closed,
Blower fan Close All, rolls wire rod diameter Φ 5.5- Φ 25mm.
Claims (2)
1. a kind of 8.8 grades of securing member non-quenched cold heading steel wire rods are it is characterised in that composition is by weight percentage：
[C]:0.25%～0.30%, [Si]:0.40%～0.60%, [Mn]:1.10%～1.30%, [P]≤0.020%,
[S]≤0.015%, [Cr]:0.10%～0.15%, [V]:0.06%～0.10%, [Ti]:0.01%～0.03%,
Inevitably impurity is not higher than 0.1%, and remaining is ferrum.
2. a kind of 8.8 grades of securing member non-quenched cold heading steel Production method for wire rod according to claim 1,
It is characterized in that：Add including molten iron pretreatment-converter smelting-LF stove refine-bloom continuous casting-tandem rolling cogging-wire rod
Heat, rolling, control are cold；Converter adopts double slag process to smelt, slag-stopping tapping, controls into LF stove P≤0.010%；
LF stove makes high basicity slag depth desulfurization, submerged arc heating, Argon, alloying；25 DEG C -30 of the Metal in Tundish degree of superheat
DEG C, electromagnetic agitation electric current 400-450A, pulling rate 0.6-0.7m/min；Wire rod rolling adopts thermo-mechanical rolling technique,
Wire rod heating-up temperature 1100-1200 DEG C, rolls into 800 DEG C -820 DEG C of finish rolling, 750 DEG C -780 DEG C of laying temperature,
Roller table speed 6-9m/min, front 2～4 thermal insulation covers are opened, and remaining thermal insulation cover is closed, blower fan Close All.
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| CN201510548362.9A CN106480372A (en) | 2015-08-31 | 2015-08-31 | Non-quenched and tempered cold-heading steel wire rod for 8.8-grade fastener and production method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136757A (en) * | 2018-09-05 | 2019-01-04 | 包头钢铁（集团）有限责任公司 | The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod |
| CN109913738A (en) * | 2019-03-19 | 2019-06-21 | 江阴华西钢铁有限公司 | The production technology of high-performance 35K cold-forging steel continuous casting square billet |
| CN109957728A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof |
| CN110238192A (en) * | 2019-07-19 | 2019-09-17 | 中天钢铁集团有限公司 | Utilize the method for mini milling train production prestress wire wire rod |
| CN115261727A (en) * | 2022-08-05 | 2022-11-01 | 江苏永钢集团有限公司 | MnV series non-quenched and tempered cold heading steel wire rod for 9.8-grade fastener and production method thereof |
| CN117535587A (en) * | 2023-10-12 | 2024-02-09 | 南京钢铁股份有限公司 | Non-quenched and tempered cold-heading steel and preparation method thereof |
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| CN109957728A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof |
| CN109957728B (en) * | 2017-12-14 | 2021-02-23 | 鞍钢股份有限公司 | Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof |
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| CN110238192A (en) * | 2019-07-19 | 2019-09-17 | 中天钢铁集团有限公司 | Utilize the method for mini milling train production prestress wire wire rod |
| CN115261727A (en) * | 2022-08-05 | 2022-11-01 | 江苏永钢集团有限公司 | MnV series non-quenched and tempered cold heading steel wire rod for 9.8-grade fastener and production method thereof |
| CN115261727B (en) * | 2022-08-05 | 2023-10-17 | 江苏永钢集团有限公司 | MnV-series non-quenched and tempered cold heading steel wire rod for 9.8-grade fastener and production method thereof |
| CN117535587A (en) * | 2023-10-12 | 2024-02-09 | 南京钢铁股份有限公司 | Non-quenched and tempered cold-heading steel and preparation method thereof |
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