CN109609838A - A kind of high intensity torsional shear type bolt Alloy Cold Heading Steel and its production method - Google Patents
A kind of high intensity torsional shear type bolt Alloy Cold Heading Steel and its production method Download PDFInfo
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- CN109609838A CN109609838A CN201811359775.2A CN201811359775A CN109609838A CN 109609838 A CN109609838 A CN 109609838A CN 201811359775 A CN201811359775 A CN 201811359775A CN 109609838 A CN109609838 A CN 109609838A
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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
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of high-intensitive torsional shear type bolt Alloy Cold Heading Steel and its production methods, the Alloy Cold Heading Steel chemical component composition and its mass percentage are as follows: C:0.19~0.24%, Mn:1.30~1.60%, Si:0.18~0.22%, Ti:0.04~0.10%, B:0.0005~0.0035%, Als:0.02~0.04%, remaining is Fe and inevitable impurity element；The production method includes converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process.High intensity torsional shear type bolt of the invention is designed with Alloy Cold Heading Steel by reasonable ingredient, in conjunction with heating temperature, heating time, into the control of final rolling temperature, laying temperature and roll groove service life, final products surface hardness and the narrow fluctuation range of torsional shear meet man, Standard Component Factory user and require, and have stronger competitive advantage in type of industry.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of high intensity torsional shear type bolt Alloy Cold Heading Steel and its life
Production method.
Technical background
ML20MnTiB torsion shear type high tensile bolt is the important foundation element of the seventies exploitation, the company as steel construction
Fitting has been widely used；In order to guarantee used in steel construction that link Bolt Tightening Force is consistent, avoid a part of bolt due to
Tighten excessive, stress is big, is easy to appear fracture；And part Bolt Tightening Force is small, loosens, and does not stress, and eventually causes steel knot
There are quality problems in structure；Country's Steel Structure Installation is typically all with high-intensitive torsional shear type bolt at present, it is common to use 10.9 grades of steel
Structure torsional shear type bolt.
10.9 grades of steel construction torsional shear type bolts, big (by taking M20 as an example, the mushroom head outer diameter of bolt reaches for deformation when cold working
Require base material there must be good cold-heading to Φ 37mm), base material there must be good inherent, surface quality；Because of it
Used in the link of steel construction, intensity and toughness with higher are also wanted.Therefore to the wire rod ML20MnTiB Composition Control used,
Surface quality has very strict requirements.
By optimizing ML20MnTiB chemical component, in conjunction with the improvement of heating stove heating, controlled rolling technique, one kind is developed
High-intensitive torsional shear type bolt Alloy Cold Heading Steel and its production method reach the high-intensitive torsional shear type bolt Alloy Cold Heading Steel of increase
Ferrite content, reduce ferrite hardness, reduce processing hardening, improve quenching, temper resistance purpose, make bolt hardness and
The requirement that torsional shear meets user is imperative.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-intensitive torsional shear type bolt Alloy Cold Heading Steel and its productions
Method.
To solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of high intensity torsional shear type bolt is used
Alloy Cold Heading Steel, the Alloy Cold Heading Steel chemical component composition and its mass percentage are as follows: C:0.19~0.24%, Mn:
1.30~1.60%, Si:0.18~0.22%, Ti:0.04~0.10%, B:0.0005~0.0035%, Als:0.02~
0.04%, remaining is Fe and inevitable impurity element.
Alloy Cold Heading Steel chemical component mass percentage of the present invention is preferred are as follows: C:0.20~0.23%, Mn:1.40
~1.48%, Ti:0.04~0.07%, B:0.0014~0.0024%.
Alloy Cold Heading Steel specification of the present invention is 16~22mm of Φ.
Alloy Cold Heading Steel of the present invention: hardness: 33~39HRC, torsional shear: 155~180KN.
The present invention also provides a kind of production method of high-intensitive torsional shear type bolt Alloy Cold Heading Steel, the production methods
Including molten iron pre-desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The heating furnace adds
Thermal process, 1080~1120 DEG C of soaking section temperature, 90~130min of heating time；The controlled rolling process, into finishing mill temperature
880~920 DEG C, 850~880 DEG C of laying temperature of degree.
Continuous casting working procedure of the present invention, liquid fluctuating control control the degree of superheat≤30 DEG C in ± 15mm；Strict control two is cold
The cooling uniformity in area, using weak cold, specific water is 0.25~0.35L/min.
Controlled rolling process of the present invention, the control of groove service life are as follows: 1#-4#≤10000t, 5#-10#≤
6000t, 11#-12#≤5000t, 13#-14#≤3000t, 27#-30#≤2000t；28 frame guide and guard using the time control for≤
2h。
The quick test stage requirement of the process and finished product of the method for the invention production: 2# is cut, 800 cut every batch of head Zhi Jinhang
Sample pickling；At least two progress pickling cold upsetting inspections of finished product every batch of.
Mentality of designing of the present invention:
Chemical component effect of the present invention and content:
Carbon is mainly present in steel in the form of carbide (Fe3C), is the essential element for determining the intensity of steel.Therefore carbon
It should guarantee certain intensity in control, consider the plasticity of steel, toughness reguirements again, while carbon content is too low can reduce hot place
Harden ability when reason, so carbon control is advisable 0.19~0.24% in the middle upper limit.
Silicon is solid-solution in matrix, and the effect for improving ferrite flow harden rate is very strong, plays solution strengthening effect, thus
Intensity and hardness are improved, plasticity is reduced, increases the brittleness of steel, causes the cold working of steel difficult.Therefore reducing silicone content can show
Writing reduces ferrite hardness, it is desirable that silicone content should reduce as far as possible, while the harden ability in order to guarantee bolt, and silicon is controlled in middle line
0.18~0.22%.
Manganese is intensified element, is existed in steel with substitutional solid solution, and the raising of manganese content can improve the plasticity of steel
Do not reduce the toughness of steel again, while the affinity of manganese and sulphur is stronger, when two be combined into manganese sulfide after, can eliminate significantly
The negative effect of sulphur.
Titanium is one of strong ferrite former, admittedly molten titanium improves the harden ability of steel.Titanium can improve carbon steel and steel alloy
Heat resistance, improve their creep rupture strength and creep resistance.Titanium slightly improves the toughness of steel, especially low-temperature impact toughness
Effect.
(975~1000 DEG C or more) part aluminium and nitrogen combination generate stable aluminum nitride particle and are in disperse aluminium at high temperature
Distribution prevents Austenite Grain Growth, to obtain inherent fine grain steel, while also eliminating the adverse effect of nitrogen.Therefore aluminium
In the presence of being very important, when control, is considered as nitrogen content and determines molten steel aluminium content.It is not more than the line of 80ppm for nitrogen content
Material, if aluminium content is more than after 0.06%, the brittleness of steel is sharply increased, therefore guarantees there there is aluminium content 0.02~0.04% in steel
Conducive to the improvement of plasticity.
Boron is micro alloying element, if containing micro boron element in steel, so that it may significantly improve the harden ability of steel, improve
The effect of harden ability is equivalent to 1.6% nickel, 0.3% chromium or 0.2% molybdenum, but has no significant effect to other performance.
Process design thinking of the present invention:
The abundant diffusion of heating temperature and heating time to the abundant austenitizing of the steel billet of Alloy Cold Heading Steel and alloying element
Direct influence, the high temperature thermoplasticity after heating steel billet, it is desirable that the resistance of deformation of steel is as low as possible, while section shrinkage can be generated
Rate is as high as possible, obtains the high temperature thermoplasticity curve graph (see Fig. 1) of ML20MnTiB by Gleebie test, can be with from Fig. 1
Find out, the control of ML20MnTiB billet heating temperature is at 850~1140 DEG C, and the tensile strength of steel billet is close to minimum, and section shrinkage
Rate highest；And it is also contemplated that heating temperature is high, be conducive to the abundant diffusion dissolution of steel grade alloying element Ti and B, so heating temperature
It is 1080~1120 DEG C by upper limit control；Heating time is longer, and billet surface decarburization can be more serious, heating time control for 90~
130min；Not only guaranteed that steel billet had good plasticity, but also controlled the depth of billet surface decarburized layer as far as possible；
The performance of steel is determined by its metallographic structure, and ML20MnTiB metallographic structure is F+P, in order to guarantee product
Mechanical performance index, the crystal grain of steel is as uniformly tiny as possible, to obtain tiny crystal grain, in the crystalline substance of original austenite before phase change
Grain wants tiny, and the crystal grain that the Recovery and recrystallization Jing Guo the operation of rolling is transformed into F+P body so just can be tiny, so finishing temperature
As low as possible with laying temperature control, finishing temperature and laying temperature will be controlled by lower limit；The high temperature thermoplasticity of ML20MnTiB
1 lower limit temperature of curve graph is 850 DEG C, thus into the control of finishing mill temperature be 880~920 DEG C, laying temperature control for 850~
880℃；
The surface quality of roll groove directly affects the size and surface quality of rolled piece in the operation of rolling, if groove is excessive
Abrasion, will result in oval rolled piece and circle rolled piece becomes with stupefied " rectangular ", and workpiece measurement will become larger, in subsequent rolling
The ears or side handles of a utensil are initially formed, and then fold defect occur；If groove surface " chip off-falling " occurs or is cracked, it equally will cause wire surface and go out
It now scabs and crack defect；It is compared by a large amount of groove surface quality and rolled piece surface quality, it should strict control groove
Service life；Guarantee the surface quality of rolled piece；The control of groove service life are as follows: 1#-4#≤10000 ton, 5#-10#≤6000 ton,
11#-12#≤5000 ton, 13#-14#≤3000 ton, 27#-30#≤2000 ton；28 frame guide and guard are≤2h using time control；
ML20MnTiB wire surface flawless, meets user usage requirements；
The surface quality of wire rod be by many rolling mills roll guarantee, no matter which group milling train goes wrong, wire rod at
Product can all generate defect, so needing to carry out regular monitoring to the surface quality of each group of milling train, it is necessary to it is sampled inspection,
2# cuts to cut to take with 800 to be rolled and leader bar in thick；Finishing finished product, which goes to cut end to end, may be taken as product rolled piece, the rolled piece taken
It needs to carry out pickling and cold forging test；So being mounted with the acid dip pickle using rolled piece preheating at 2#, 800 places of cutting；In finished product
Inspection area is mounted with high-frequency heating acid dip pickle and cold upsetting equipment, realizes the quick inspection of process rolled piece and finished product, in time
The surface quality of wire rod is monitored, timely adjustment of finding the problem guarantees the surface quality of wire rod.
A kind of high-intensitive torsional shear type bolt of the present invention refers to GB/T6478-2015 with Alloy Cold Heading Steel product standard；Product
Method for testing performance canonical reference GB/T230；Pickling and cold heading test method standard refer to GB/T233.
The beneficial effects of adopting the technical scheme are that 1, Design of Chemical Composition of the present invention, carbon presses the middle upper limit
Control, silicon, manganese press middle line traffic control；Boron and titanium descend line traffic control in pressing, and all carry out close limit control, are guaranteeing the same of wire strength
When, improve the harden ability and cold-forming property of wire rod.2, the present invention by heating temperature, heating time, into final rolling temperature
It is controlled with laying temperature, ensure that high-intensitive torsional shear type bolt Alloy Cold Heading Steel high temperature thermoplasticity, grain size and mechanical property
Energy；By the service life of strict control roll groove, good wire surface quality is obtained, roll changing time is reduced.3,
The present invention is mounted with to be mounted with high-frequency heating pickling in product inspection area using the acid dip pickle of rolled piece preheating at 2#, 800 places of cutting
Device and cold upsetting equipment realize the quick inspection of process rolled piece and finished product, monitor the surface quality of wire rod in time, and discovery is asked
Topic adjustment in time, guarantees the surface quality of wire rod and the stability of performance.4, the high-intensitive torsional shear type bolt alloy of the present invention is cold
Upsetting steel is designed by reasonable ingredient, is made in conjunction with heating temperature, heating time, into final rolling temperature, laying temperature and roll groove
The harden ability of wire rod is improved under the premise of proof strength with the control in service life, ensure that user's final products surface hardness
The narrow fluctuation range with torsional shear meets man, Standard Component Factory user and requires, has stronger competitive advantage in type of industry.
Detailed description of the invention
Fig. 1 is the high temperature thermoplasticity curve graph of ML20MnTiB wire rod；
Fig. 2 is the high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod metal lographic examination figure of embodiment 1；
Fig. 3 is the high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod metallographic structure figure of embodiment 1；
Fig. 4 is that figure is examined in the high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod pickling of embodiment 1；
Fig. 5 is the high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod product figure of embodiment 1；
Fig. 6 is torsional shear type bolt made of the high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod of embodiment 1
Figure；
Fig. 7 is 1 groove surface quality figure of embodiment；
Fig. 8 is 1 groove surface quality figure of embodiment.
Specific embodiment
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 16mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes converter smelting
Refining, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating is in ± 15mm, control
The degree of superheat is 25 DEG C；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.27L/min；Heating temperature,
Heating time is shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-2, pickling and cold-heading
Test result is shown in Table 3, and bolt hardness and torsional shear performance test results are shown in Table 4.
Fig. 2 is high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod metal lographic examination figure；Fig. 3 is high intensity
Torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod metallographic structure figure；Fig. 4 is high-intensitive torsional shear type bolt alloy cold-heading
Figure is examined in steel ML20MnTiB wire rod pickling；Fig. 5 is high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod product
Figure；Fig. 6 is torsional shear type bolt figure made of high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod；Fig. 7 is groove
Surface quality figure；Fig. 8 is groove surface quality figure.(embodiment 2-8 accordingly scheme it is similar to Example 1, therefore omit)
Embodiment 2
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 20mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 8mm, the control degree of superheat are 20 DEG C；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.29L/min；
Heating temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-2, acid
It washes and cold heading test the results are shown in Table 3, bolt hardness and torsional shear performance test results are shown in Table 4.
Embodiment 3
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 22mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 12mm, the control degree of superheat are 22 DEG C；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.31L/
min；Heating temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-
2, pickling and cold heading test the results are shown in Table 3, and bolt hardness and torsional shear performance test results are shown in Table 4.
Embodiment 4
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 20mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 6mm controls 18 DEG C of the degree of superheat；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.33L/min；Add
Hot temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-2, pickling
And cold heading test the results are shown in Table 3, bolt hardness and torsional shear performance test results are shown in Table 4.
Embodiment 5
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 16mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 3mm, the control degree of superheat are 30 DEG C；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.32L/min；
Heating temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-2, acid
It washes and cold heading test the results are shown in Table 3, bolt hardness and torsional shear performance test results are shown in Table 4.
Embodiment 6
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 22mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 15mm, the control degree of superheat are 21 DEG C；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.28L/
min；Heating temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-
2, pickling and cold heading test the results are shown in Table 3, and bolt hardness and torsional shear performance test results are shown in Table 4.
Embodiment 7
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 20mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 5mm controls 23 DEG C of the degree of superheat；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.25L/min；Add
Hot temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-2, pickling
And cold heading test the results are shown in Table 3, bolt hardness and torsional shear performance test results are shown in Table 4.
Embodiment 8
The present embodiment high intensity torsional shear type bolt ML20MnTiB wire rod that Alloy Cold Heading Steel is Φ 22mm, chemistry at
It is grouped as and mass percentage is shown in Table 1；
The production method of the present embodiment high intensity torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB wire rod includes that molten iron is pre-
Desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, controlled rolling, cooling process；The control of continuous casting working procedure liquid fluctuating exists
± 7mm, control are superheated to 15 DEG C；The cooling uniformity of strict control secondary cooling zone, using weak cold, specific water 0.35L/min；Add
Hot temperature, heating time are shown in Table 2-1 into final rolling temperature, laying temperature, and roll working life and guide and guard replacement are shown in Table 2-2, pickling
And cold heading test the results are shown in Table 3, bolt hardness and torsional shear performance test results are shown in Table 4.
The chemical component of 1 embodiment 1-8ML20MnTiB wire rod of table forms and mass percentage (%)
| Embodiment | C | Mn | Si | Ti | B | Als |
| Embodiment 1 | 0.21 | 1.44 | 0.20 | 0.05 | 0.0018 | 0.020 |
| Embodiment 2 | 0.22 | 1.46 | 0.21 | 0.06 | 0.0020 | 0.021 |
| Embodiment 3 | 0.22 | 1.42 | 0.20 | 0.06 | 0.0019 | 0.022 |
| Embodiment 4 | 0.19 | 1.40 | 0.18 | 0.04 | 0.0014 | 0.025 |
| Embodiment 5 | 0.23 | 1.48 | 0.19 | 0.07 | 0.0024 | 0.033 |
| Embodiment 6 | 0.20 | 1.30 | 0.22 | 0.08 | 0.0005 | 0.028 |
| Embodiment 7 | 0.24 | 1.35 | 0.21 | 0.09 | 0.0035 | 0.036 |
| Embodiment 8 | 0.21 | 1.60 | 0.22 | 0.10 | 0.0009 | 0.040 |
Ingredient surplus is Fe and inevitable impurity element in table 1.
The heating temperature of table 2-1 embodiment 1-8 ML20MnTiB wire rod, heating time, into final rolling temperature and laying temperature
| Embodiment | Heating temperature (DEG C) | Heating time (min) | Into final rolling temperature (DEG C) | Laying temperature (DEG C) |
| Embodiment 1 | 1115 | 110 | 902 | 870 |
| Embodiment 2 | 1120 | 109 | 908 | 865 |
| Embodiment 3 | 1105 | 113 | 900 | 864 |
| Embodiment 4 | 1100 | 120 | 903 | 880 |
| Embodiment 5 | 1117 | 105 | 895 | 862 |
| Embodiment 6 | 1080 | 90 | 880 | 870 |
| Embodiment 7 | 1086 | 130 | 920 | 850 |
| Embodiment 8 | 1092 | 112 | 904 | 860 |
The groove service life (t) of table 2-2 embodiment 1-8 ML20MnTiB wire rod and guide and guard use the time (h)
The pickling of 3 embodiment 1-8 ML20MnTiB wire rod of table, cold-heading surface quality
| Inspection project | 2# cuts pickling | 800 cut pickling | Finished product acid-washing | Cold upsetting |
| Embodiment 1 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 2 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 3 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 4 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 5 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 6 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 7 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
| Embodiment 8 | The smooth flawless in surface | The smooth flawless in surface | The smooth flawless in surface | 1/3 is qualified |
Bolt hardness and torsional shear are cut in the torsion of 4 embodiment 1-8 ML20MnTiB wire rod of table
Above-described embodiment shows high-intensitive torsional shear type bolt Alloy Cold Heading Steel ML20MnTiB metallographic produced by the invention
Examine that flawless, metallographic structure P+F be normal, wire rod pickling flawless, surface quality is good, performance is stable, meets Standard Component Factory
Family user requires, and has stronger competitive advantage in type of industry.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (8)
1. a kind of high intensity torsional shear type bolt Alloy Cold Heading Steel, which is characterized in that the Alloy Cold Heading Steel chemical component composition
And its mass percentage are as follows: C:0.19~0.24%, Mn:1.30~1.60%, Si:0.18~0.22%, Ti:0.04~
0.10%, B:0.0005~0.0035%, Als:0.02~0.04%, remaining is Fe and inevitable impurity element.
2. a kind of high-intensitive torsional shear type bolt Alloy Cold Heading Steel according to claim 1, which is characterized in that the alloy
Cold-heading steel chemical composition mass percentage is preferred are as follows: C:0.20~0.23%, Mn:1.40~1.48%, Ti:0.04~0.07%,
B:0.0014~0.0024%.
3. a kind of high-intensitive torsional shear type bolt Alloy Cold Heading Steel according to claim 1, which is characterized in that the alloy
Cold-forging steel specification is 16~22mm of Φ.
4. a kind of high-intensitive torsional shear type bolt Alloy Cold Heading Steel according to claim 1, which is characterized in that the alloy
Cold-forging steel: hardness: 33~39HRC, torsional shear: 155~180KN.
5. the producer based on a kind of high intensity torsional shear type bolt Alloy Cold Heading Steel described in claim 1-4 any one
Method, which is characterized in that the production method includes molten iron pre-desulfurization, converter smelting, LF refining, continuous casting, heating stove heating, control
Rolling, cooling process；The heating furnace heating process, 1080~1120 DEG C of soaking section temperature, 90~130min of heating time；Institute
Controlled rolling process is stated, into 880~920 DEG C of finishing mill temperature, 850~880 DEG C of laying temperature.
6. a kind of production method of high-intensitive torsional shear type bolt Alloy Cold Heading Steel according to claim 5, feature exist
In the continuous casting working procedure, liquid fluctuating control controls the degree of superheat≤30 DEG C in ± 15mm；Strict control secondary cooling zone cools down equal
Even property, using weak cold, specific water is 0.25~0.35L/min.
7. a kind of production method of high-intensitive torsional shear type bolt Alloy Cold Heading Steel according to claim 5, feature exist
In, the controlled rolling process, the control of groove service life are as follows: 1#-4#≤10000t, 5#-10#≤6000t, 11#-12#≤
5000t, 13#-14#≤3000t, 27#-30#≤2000t；28 frame guide and guard are≤2h using time control.
8. a kind of producer of high intensity torsional shear type bolt Alloy Cold Heading Steel according to claim 5-7 any one
Method, which is characterized in that the quick test stage requirement of the process and finished product of the method production: 2# is cut, 800 cut every batch of head Zhi Jinhang
Sample pickling；At least two progress pickling cold upsetting inspections of finished product every batch of.
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| CN201811359775.2A CN109609838A (en) | 2018-11-15 | 2018-11-15 | A kind of high intensity torsional shear type bolt Alloy Cold Heading Steel and its production method |
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| CN201811359775.2A CN109609838A (en) | 2018-11-15 | 2018-11-15 | A kind of high intensity torsional shear type bolt Alloy Cold Heading Steel and its production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261729A (en) * | 2022-08-12 | 2022-11-01 | 河北普阳钢铁有限公司 | Method for producing fastener |
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|---|---|---|---|---|
| CN101775546A (en) * | 2010-03-19 | 2010-07-14 | 江苏省沙钢钢铁研究院有限公司 | High strength boron-containing cold heading steel for fastener and preparation process thereof |
| JP2015189987A (en) * | 2014-03-27 | 2015-11-02 | 株式会社神戸製鋼所 | Case hardening steel having excellent cold forgeability with suppressable abnormal grain growth upon carburizing |
| CN105063480A (en) * | 2015-08-25 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Method for producing high-strength cold-forged steel containing boron |
| CN105063479A (en) * | 2015-08-25 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Production method for boron-containing cold heading steel |
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2018
- 2018-11-15 CN CN201811359775.2A patent/CN109609838A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775546A (en) * | 2010-03-19 | 2010-07-14 | 江苏省沙钢钢铁研究院有限公司 | High strength boron-containing cold heading steel for fastener and preparation process thereof |
| JP2015189987A (en) * | 2014-03-27 | 2015-11-02 | 株式会社神戸製鋼所 | Case hardening steel having excellent cold forgeability with suppressable abnormal grain growth upon carburizing |
| CN105063480A (en) * | 2015-08-25 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Method for producing high-strength cold-forged steel containing boron |
| CN105063479A (en) * | 2015-08-25 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Production method for boron-containing cold heading steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115261729A (en) * | 2022-08-12 | 2022-11-01 | 河北普阳钢铁有限公司 | Method for producing fastener |
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