CN106834639A - The method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high - Google Patents
The method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high Download PDFInfo
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- CN106834639A CN106834639A CN201710215163.5A CN201710215163A CN106834639A CN 106834639 A CN106834639 A CN 106834639A CN 201710215163 A CN201710215163 A CN 201710215163A CN 106834639 A CN106834639 A CN 106834639A
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- China
- Prior art keywords
- steel
- control
- strength bolt
- micro alloying
- ferrite
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Classifications
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
A kind of method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high, belongs to deep processing drawing technique control field.Processing step and the technical parameter for controlling are：The air-cooled control of stelmor, by adding a cover stay-warm case, 13 DEG C/s of rear cooling rate is rolled in control, and it is 45 55% to obtain ferrite content；Ferritic-pearlitic type hot-finished material, is cold work reinforced through deep processing drawing process, and drawing draft is controlled 20 25%.Advantage is：Control ferritic-pearlitic type Micro Alloying high-strength bolt steel ferritic ratio and cold drawing draft, obtain the optimal positive dislocation density of organization internal, obtain Bauschinger effect value higher.
Description
Technical field
The invention belongs to deep processing drawing technique control field, a kind of control ferrite-pearlite class is in particular, provided
The control method of type Micro Alloying high-strength bolt steel Bauschinger effects high, the line traffic control high for producing control non-hardened and tempered steel
With user's process control technology.
Background technology
With the high speed development of society, in order to meet the sustainable development in future, low energy consumption, low stain and high performance steel
Material turns into the direction of development.Direction of the deep processing industry gradually to high efficiency, low cost and work flow minimizing is fast-developing,
So that the new material exploitation for adapting to new technological process is extremely urgent.
High-strength (the 8.8 grades and more than) bolt of domestic tradition, is carried out using medium carbon steel, low-carbon alloy steel or medium carbon alloy steel
Quenched (quenching+tempering) treatment.And high-strength bolt product is manufactured using cold work reinforced non-quenched cold heading steel can save steel
The modifier treatment after the shaping of annealing and bolt before cold-drawn, only cancels modifier treatment one, the cost-effective 800- of ton steel
1000 yuan, production process is considerably simplify, shorten the production cycle, reduce energy resource consumption, while also avoid
Because heat treatment and caused by surface oxidation, decarburization and workpiece deform the problems such as, thus imitated with significant economic benefit and society
Benefit, cold work reinforced non-quenched cold heading steel is the new technology route of high-intensity fasteners, is developing direction from now on.
Study more both at home and abroad on cold work reinforced non-hardened/tempered steel, external nippon NHF-S (Nippon Steel
Low Carbon High Tensile Cold Forming Wire Rod-Special) Series Steel, Kobe KNCH (Kobe
Non Heat Treatment Cold Heading Wire Rod), Japan Datong District MC8 and domestic horse steel Ultra-fine Grained Micro Alloying
One of the directions such as steel, the direction as the development of high-strength cold-forging steel.But the key link of restriction non-hardened and tempered steel development is due to logical
Cross the cold work reinforced rear intensity of drawing and reached high strengthening, intensity is high during deep processing bolt heading, grinding tool loss is big and easily
Problems of crack limits a large amount of of non-hardened and tempered steel high-strength bolt and uses.And traditional high-strength bolt is that drawing heading is laggard into bolt
Row modifier treatment obtains high-strength performance, but there are problems that high cost and skin decarburization,.Therefore, research Micro Alloying is high-strength
The Bauschinger effects high of heading after bolt drawing, reduce the loss of user's heading grinding tool, are obtained as Micro Alloying high-strength bolt steel
To the key technology that market is approved.
Study more on cold work reinforced Micro Alloying high-strength bolt steel, mainly there is following several organization types, including iron element
Body-pearlite type, ferrite-bainite type, ferrite-martensite Bipolar Type and Ultra-fine Grained types of steel.Patent
The milling method of 10.9 grade chromium-containing non-quenched cold heading steels and its gren rod is proposed in 200910144282.1, is closed by adding
The optimizing components design of golden Cr elements and the method for 750~830 DEG C of zerolling, obtain the granular bainite microstructure of refinement.
Its technical thought is to obtain ultra-fine grain bainite structure by zerolling, so as to obtain good cold-workability and toughness.
The milling method of 10.9 grade niobium-containing non-quenched cold heading steels and its gren rod is proposed in patent 200910144284.0, is proposed logical
The optimizing components design and the method for 750~830 DEG C of zerolling of addition alloy Nb elements are crossed, the granular bayesian of refinement is obtained
Body tissue.Its technical thought is to obtain ultrafine crystal bainite tissue by the precipitation crystal grain thinning of zerolling and Nb, so as to obtain
Obtain cold-workability and toughness well.In patent 201010223245.2 propose non-hardened bainite cold heading steel for fastener and
Its manufacture method, using C-Mn steel on the basis of, by adding trace element B, acquisition bainite type non-quenched cold heading steel, the above is special
Profit is bainite type non-quenched cold heading steel.Patent 201510401847.5 proposes the line high of boron-containing non-quenching and tempering double-phase cold heading steel
Milling method, using C-Mn steel on the basis of, by adding micro B, obtain the line high of ferrite-martensite type double-phase cold heading steel
Milling method.Non-quenched cold heading steel for high-strength fasteners and its manufacture method are proposed in patent 201010127852.9, is adopted
With Cr elements are added on C-Mn component bases, the conventional organization of ferrite+pearlite is obtained by stelmor line traffic control, but
Method without research control Bauschinger effects high.High-intensity fasteners use is proposed in patent 200710036254.9
Non-quenching and tempering double-phase cold heading steel and its manufacture method, the patent are combined on the basis of C-Mn elements by adding V, Nb or V-Nb
Schedule of reinforcement, by Stanermo wind-cooling linear control ferrite+martensite duplex structure.It is non-that above patent is different type
Quenched steel grades controlling technical method, mainly studies ferrite-pearlite types of steel by way of predeformation-heading herein
Obtain a kind of deep processing control method of low processing hardening Bauschinger effects high.
The content of the invention
The anger ground of invention is to provide one kind to control ferrite-pearlite type Micro Alloying high-strength bolt steel high
The method of Bauschinger effect, solves the loss of ferrite-pearlite type Micro Alloying high-strength bolt steel process heading grinding tool
High, the easy problems of crack of heading, is adapted to the control of the low processing hardening of cold work reinforced non-hardened/tempered steel heading, concrete technology step and
The technical parameter for controlling is：
1st, the air-cooled control of stelmor, by adding a cover stay-warm case, 1-3 DEG C of rear cooling rate/s is rolled in control, obtains ferrite content
It is 45-55%；
The size of Bauschinger effects is relevant with many factors.For ferrite-pearlite shaped steel, with increase wire rod
Cooling velocity after rolling is closely related with cold drawing draft.Wherein, by controlling cooling velocity after rolling, ferrite content is reduced,
So that dislocation density locally increases, thus obtain the increase of Bauschinger effect values.
2nd, ferrite-pearlite type hot-finished material, through deep processing drawing process (cold work reinforced), the control of drawing draft
In 20-25%；
Bauschinger effects are that the plastic strain reinforcing that positive loading causes during Metal Forming causes gold
Category material is presented the phenomenon of Plastic strain softening (yield limit reduction) during subsequent Opposite side loading.When by metal material
Be offloaded to zero, then Opposite side loading after being first stretched to plastic period, that is, when being compressed deformation, the compression yield limit of material
Yield limit than original state (being directly compressed without advance stretching plastic deformation) is substantially low.High-strength bolt is processed
Technique is hot-finished material, and --- pickling --- drawing deformation --- heading, hot-finished material drawing process belongs to positive loading and causes strain
Reinforcing, heading process belongs to Opposite side loading process.It is Micro Alloying to make full use of the reduction heading grinding tool loss of steel grade Bauschinger characteristic
The key factor of high-strength bolt steel control.
In forward direction deformation, dislocation motion forms dislocation tangle or cellular structure.This dislocation structure is phase on mechanics
When stabilization, if now unloading and then loading in the same direction, dislocation line can not proceed significantly motion.If but unloading after-applied
Reversed load, dislocation counter motion.On reverse path, dislocation hinder negligible amounts, dislocation can moved down compared with low stress it is dynamic
Relatively large distance.Therefore forward and reverse dislocation superposition or counteracting are the mechanism that high-strength bolt non-hardened and tempered steel forms Bauschinger effect.Cause
This, drawing process predegeneration amount (drawing draft) is the key factor for controlling positive dislocation amount in non-hardened and tempered steel microstructure.
Optimal cold drawing draft selection principle strain hardening exponent not yet increased stage for Bauschinger effect is maximum.In this rank
Section, correspond to dislocation and fully rises in value and tangle in microstructure, but material original slip system starts difficult do not deform upon also
Twin, though or there is twin dislocation not rise in value further the stage.
Ferrite-pearlite type Micro Alloying high-strength bolt steel drawing predeformation amount is controlled to be imitated for 20%, Bauschinger
Acquisition should be worth maximum, reach 200Mpa.
The advantage of the invention is that：Control ferrite-pearlite type Micro Alloying high-strength bolt with steel ferritic ratio and
Cold drawing draft, obtains the optimal positive dislocation density of organization internal, obtains Bauschinger effect value higher.
Brief description of the drawings
Fig. 1 is ferrite-pearlite Micro Alloying high-strength bolt steel micro-organization chart.
Fig. 2 is the predeformation and heading compressive stress strain curve figure of ferrite pearlific steel predeformation 5%.
Fig. 3 is the predeformation and heading compressive stress strain curve figure of ferrite pearlific steel predeformation 15%.
Fig. 4 is heading analog compression stress-strain curve after ferrite pearlific steel predegeneration 25-55%.
Fig. 5 is the graph of relation of ferrite pearlific steel predeformation amount and Bauschinger effect value.
Specific embodiment
Embodiment 1
The present invention is in line 160mm high2It is applied in production Φ 6.5mm wire rods, obtains the non-hardened and tempered steel of excellent performance.
The air-cooled control of 1 stelmor, lid stay-warm case 5-22# controls slow cooling 1 DEG C/s of cooling rate, and ferrite contains in being organized
It is 50-55% to measure；
2. gren rod is through user's deep processing drawing processThe control of drawing single pass draft exists
25%.
Table 1 is steel wire properties after the mechanical property of ￠ 6.5mm ferrite-pearlite types of steel gren rods and drawing.
Embodiment 2
The present invention is in Shoudu Iron and Steel Co line 160mm high2It is applied in production Φ 6.5mm wire rods, obtains the non-tune of excellent performance
Matter steel.
The air-cooled control of 1 stelmor, lid stay-warm case 5-18# controls slow cooling 3 DEG C/s of cooling rate, and acquisition ferrite content is 45-
50%；
2. by hot-finished material through user's deep processing drawing processDrawing single pass draft is controlled
20%.
Table 1 is steel wire properties after the mechanical property of φ 6.5mm ferrite-pearlite types of steel gren rods and drawing.
Claims (1)
1. a kind of method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high, it is characterised in that processing step and control
Technical parameter is as follows：
(1) the air-cooled control of stelmor, by adding a cover stay-warm case, 1-3 DEG C of rear cooling rate/s is rolled in control, obtains ferrite content and is
45-55%；
(2) ferrite-pearlite type hot-finished material, is cold work reinforced through deep processing drawing process, and the control of drawing draft exists
20-25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710215163.5A CN106834639A (en) | 2017-04-02 | 2017-04-02 | The method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710215163.5A CN106834639A (en) | 2017-04-02 | 2017-04-02 | The method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high |
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| CN106834639A true CN106834639A (en) | 2017-06-13 |
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| CN201710215163.5A Pending CN106834639A (en) | 2017-04-02 | 2017-04-02 | The method for controlling Micro Alloying high-strength bolt steel Bauschinger effect high |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041362A (en) * | 2019-12-16 | 2020-04-21 | 首钢集团有限公司 | Method for improving steel ladle simmer effect of non-quenched and tempered bolt |
| CN111088415A (en) * | 2020-02-12 | 2020-05-01 | 首钢集团有限公司 | Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof |
| CN111485087A (en) * | 2020-05-18 | 2020-08-04 | 南京钢铁股份有限公司 | Preparation method of 10.9-grade SCM435 non-quenched and tempered bolt steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0976469A2 (en) * | 1998-07-27 | 2000-02-02 | Institut für Verformungskunde und Hüttenmaschinen | Process for linear stretching |
| CN101812644A (en) * | 2010-03-19 | 2010-08-25 | 江苏省沙钢钢铁研究院有限公司 | Non-quenched cold heading steel for high-strength fasteners and manufacturing method thereof |
| CN105821191A (en) * | 2016-03-25 | 2016-08-03 | 首钢总公司 | Method for controlling low guarantee load of ferrite-martensite non-quenched and tempered steel high-strength bolt |
-
2017
- 2017-04-02 CN CN201710215163.5A patent/CN106834639A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0976469A2 (en) * | 1998-07-27 | 2000-02-02 | Institut für Verformungskunde und Hüttenmaschinen | Process for linear stretching |
| CN101812644A (en) * | 2010-03-19 | 2010-08-25 | 江苏省沙钢钢铁研究院有限公司 | Non-quenched cold heading steel for high-strength fasteners and manufacturing method thereof |
| CN105821191A (en) * | 2016-03-25 | 2016-08-03 | 首钢总公司 | Method for controlling low guarantee load of ferrite-martensite non-quenched and tempered steel high-strength bolt |
Non-Patent Citations (2)
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| 沈德山等: ""细晶非调质钢紧固件生产现状"", 《金属制品》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041362A (en) * | 2019-12-16 | 2020-04-21 | 首钢集团有限公司 | Method for improving steel ladle simmer effect of non-quenched and tempered bolt |
| CN111041362B (en) * | 2019-12-16 | 2021-05-25 | 首钢集团有限公司 | Method for improving steel ladle simmer effect of non-quenched and tempered bolt |
| CN111088415A (en) * | 2020-02-12 | 2020-05-01 | 首钢集团有限公司 | Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof |
| CN111088415B (en) * | 2020-02-12 | 2021-11-19 | 首钢集团有限公司 | Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof |
| CN111485087A (en) * | 2020-05-18 | 2020-08-04 | 南京钢铁股份有限公司 | Preparation method of 10.9-grade SCM435 non-quenched and tempered bolt steel |
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