CN108239723A - A kind of MG700 anchor bar steels and its hot rolling production method - Google Patents
A kind of MG700 anchor bar steels and its hot rolling production method Download PDFInfo
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- CN108239723A CN108239723A CN201810176744.7A CN201810176744A CN108239723A CN 108239723 A CN108239723 A CN 108239723A CN 201810176744 A CN201810176744 A CN 201810176744A CN 108239723 A CN108239723 A CN 108239723A
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/04—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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Abstract
A kind of MG700 anchor bar steels and its hot rolling production method, belong to anchor bar steel technical field.Steel billet chemical analysis is by weight percentage：C：0.06 0.08%, Si：0.80 0.90%, Mn：1.5 1.7%, Cr:0.45 0.55%, Nb：0.03 0.05%, Al：0.015 0.040%, B：0.0010 0.0025%, P≤0.025%, S≤0.025%, [O]≤0.0025%, [N]≤0.0060%, surplus Fe.Technological process controls cooling for converter smelting → ladle alloying → LF refining → full guard casting → steel billet inspection → heating stove heat → controlled rolling → after rolling；Beneficial effects of the present invention are：(1) remove heat treatment process from, MG700 High strength bolt steel is produced in direct hot rolling；(2) while obtaining high intensity, higher ballistic work is obtained, improves roadway support safety；(3) MG700 performances meet σ s >=700MPa, σ b >=900MPa, δ 5 >=15%, room temperature AKv >=50J.
Description
Technical field
The invention belongs to anchor bar steel technical field, more particularly to a kind of MG700 anchor bar steels and its hot rolling producer
Method；High strength bolt steel is produced suitable for hot rolling technology.
Background technology
Anchor bar steel is used for mine timbering, and including coal mine and some copper mines etc., coal in China mining depth is just with 8-
The speed of 12m/a increases, and new river in Shangdong Province, Zibo, the mining depth of opening the mining areas such as Luan, Xuzhou already exceed 1000m, it is contemplated that in future 20
The many coal mines in year China will go into the mining depth of 1000-1500m.Every ten thousand tons of the annual requirement 60-80 in anchor bar steel market at present,
The main trade mark has MG335, MG400, MG500, MG600 etc., wherein, High strength bolt steel does not require nothing more than very high-ductility, also requires
There is preferable ballistic work, to the more demanding of purity of steel.
With the increase of coal mine excavation depth, gob side entry, lateral pressure is larger, and the molding of portion of side is poor, and when tunnelling is easy
Wall caving, broken, portion of side supporting difficulty increase, and the mining supports anchor pole of higher intensity rank becomes the new demand of existing market.It is beautiful
The rock bolt steel yield strength of state is mainly more than 500MPa, and Britain reaches 640-720MPa, and Australia has now been developed
The rock bolt steel of 800MPa, Voestalpine produce High strength bolt using heat treatment process.The current MG700 anchor bar steels in China also in
Development phase does not have the application case of production application also.Therefore, it for the safe design of mine and the deficiencies in the prior art, opens
It is trend of the times to send out MG700 rank anchor bar steels, imperative.
The production other anchor bar steel of MG335, MG400, MG500, MG600 grade generally uses hot rolling technology at present, and wants to obtain
The anchor bar steel of the superhigh intensity of 700Mpa ranks is obtained, cannot be reached if continuing traditional hot rolling technology production of above-mentioned rank
Take into account superhigh intensity and the requirement of plasticity and toughness energy.According to the mode of Tempering and Quenching, high intensity and high-plasticity can be obtained
Combination, but MG700 processes are more, and lumber recovery is low for producing for the process system, and production cost is high, is not suitable for the production of bar producing line
The anchor pole steel product of low cost is also unfavorable for batch production and marketing, for this purpose, the present invention provides a kind of novel production anchor
The hot rolling production method of bar steel.
Invention content
The purpose of the present invention is to provide a kind of MG700 anchor bar steels and its hot rolling production methods, overcome lacking for traditional handicraft
It falls into.The coal mine roadway safety anchor bar steel of 700Mpa ranks is obtained, production process can be reduced using this method, reduce production
Cost improves cost performance.
The present invention provides a kind of steel billet chemical analysis of MG700 anchor bar steels：C：0.06-0.08%,
Si：0.80-0.90%, Mn：1.5-1.7%, Cr:0.45-0.55%, Nb：0.03-0.05%, Al：0.015-0.040%, B：
0.0010-0.0025%, P≤0.025%, S≤0.025%, [O]≤0.0025%, [N]≤0.0060%, surplus Fe.
The effect of key element：
C is the essential element of intensity, and improving carbon can cause the intensity of steel significantly to be promoted, and the prior art obtains iron
The tissue of ferritic pearlite cannot take into account intensity and plasticity and toughness can requirement, and the novel components system of low-carbon and alloying+
The mode of rapid cooling obtains bainite structure and can realize.Carbon content is excessively high, the too low requirement that cannot meet the present invention, therefore,
The carbon content that the present invention uses ranging from 0.06-0.08%.
Nb、Al：Niobium, aluminium are the essential elements of precipitation strength and refined crystalline strengthening, and adding a small amount of niobium can be so that steel obtains
The promotion effect of higher strength and toughness.Ranging from 0.03-0.05%, 0.015-0.040% of optimal niobium.
B、Cr：The element is the good element of quenching degree, and the quenching degree of B is best, is equipped with the chromium of certain content, effect is most
It is good.The additive amount of B is excessive, then deteriorates the toughness of steel, is unfavorable for the performance of performance, therefore the preferred scope of B, Cr of this paper point
It Wei not 0.0010-0.0025%, 0.45-0.55%.
The technological process of hot rolling production method of the MG700 anchor bar steels of the present invention is：Converter smelting → ladle alloying →
LF refining → full guard casting → steel billet inspection → heating stove heat → controlled rolling → controls cooling after rolling.Hot rolling technology and
The technical parameter controlled in technique is as follows：
In order to ensure alloy solid solution and abundant austenitizing, heating temperature is set as 1100 DEG C -1200 DEG C, and heating time is not
It obtains less than 2h；1050-1150 DEG C of start rolling temperature, 900-1000 DEG C of entry temperature at finishing；It is cold using two-part grading control after rolling
But mode goes out one cold section of temperature control between 700~750 DEG C, goes out the control of secondary cooling zone temperature between 460-520 DEG C.
The key problem in technology of the present invention mainly has following three points：1st, overcome the conventional anchor composition of steel design of the prior art cannot
Reach MG700 anchor bar steel performance requirement present situations, using novel composition design；2nd, using novel Controlled cooling process so that
Anchor bar steel has the matching between high intensity and good plasticity and toughness.The measure taken is that low-carbon and the cooperation of suitable alloy reach modeling
The good combination of toughness, high-temperature heating promotion alloy solid solution, the precipitation strength of Nb, the quenching degree of B, Cr are quick with reference to rear two-stage is rolled
The strong cold bainite structure for obtaining high intensity and excellent toughness reaches the target comprehensive performance of material.
Advantageous effect using the present invention：
(1) remove heat treatment process from, MG700 High strength bolt steel is produced in direct hot rolling；
(2) while obtaining high intensity, higher ballistic work is obtained, improves roadway support safety；
(3) MG700 performances meet σ s >=700MPa, σ b >=900MPa, δ 5 >=15%, room temperature AKv >=50J.
Specific embodiment
Steel billet ingredient：
Ingredient 1：C:0.077%th, Si:0.87%th, Mn:1.62%th, Cr：0.5%th, Nb：0.045%th, Al：0.037%th, B：
0.0022%th, P:0.017%th, S:0.011%th, O：0.0012%th, N：0.0035%；Surplus：Fe.
Ingredient 2：C:0.06%th, Si:0.8%th, Mn:1.7%th, Cr：0.55%th, Nb：0.03%th, Al：0.015%th, B：
0.0025%th, P:0.010%th, S:0.011%th, O：0.0015%th, N：0.0040%；Surplus：Fe.
Ingredient 3：C:0.08%th, Si:0.9%th, Mn:1.5%th, Cr：0.45%th, Nb：0.055%th, Al：0.040%th, B：
0.0011%th, P:0.014%th, S:0.011%th, O：0.0025%th, N：0.0060%；Surplus：Fe.
Production technology is：1100 DEG C of heating temperature, 1190 DEG C, 1180 DEG C, 1140 DEG C, heating time 2h, start rolling temperature
1050/1150/1100/1120 DEG C, 910/950/1000/970 DEG C of entry temperature at finishing；It is cold using two-part grading control after rolling
But mode goes out one cold section of temperature control between 710/730/750/735 DEG C, goes out the control of secondary cooling zone temperature 460/470/520/
Between 500 DEG C
Stablized using MG700 High strength bolts steel mechanical property produced by the invention, through Beijing's iron and steel industry product matter
It measures supervision and inspection station to examine, intensity rank has reached 700MPa grades, and inspection result see the table below.
Table 1MG700 superhigh intensity anchor pole steel mechanical properties
It should be noted last that more than specific embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of technical solution of the present invention, should all cover
In scope of the presently claimed invention.
Claims (3)
1. a kind of MG700 anchor bar steels, it is characterised in that：The steel billet chemical analysis used by weight percentage for：C：0.06-
0.08%th, Si：0.80-0.90%, Mn：1.5-1.7%, Cr：0.45-0.55%, Nb：0.03-0.05%, Al：0.015-
0.040%th, B：0.0010-0.0025%, P≤0.025%, S≤0.025%, [O]≤0.0025%, [N]≤0.0060%,
Surplus is Fe.
2. a kind of hot rolling production method of the MG700 anchor bar steels described in claim, technological process are：Converter smelting → ladle closes
Aurification → LF refining → full guard casting → steel billet inspection → heating stove heat → controlled rolling → controls cooling after rolling；Its feature
It is：Hot rolling technology and the technical parameter controlled in process are：
(1) heating temperature is set as 1100 DEG C -1200 DEG C, and heating time must not be less than 2h；1050-1150 DEG C of start rolling temperature, essence
Roll 900-1000 DEG C of inlet temperature；
(2) using the two-part grading control type of cooling after roller repairing method is rolled, go out one cold section of temperature control 700~750
Between DEG C, go out the control of secondary cooling zone temperature between 460-520 DEG C.
3. production method according to claim 2, it is characterised in that：MG700 anchor pole Steel Properties meet σ s >=700MPa, σ b
>=900MPa, δ 5 >=15%, room temperature AKv >=50J；It is organized as bainite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810176744.7A CN108239723A (en) | 2018-03-03 | 2018-03-03 | A kind of MG700 anchor bar steels and its hot rolling production method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810176744.7A CN108239723A (en) | 2018-03-03 | 2018-03-03 | A kind of MG700 anchor bar steels and its hot rolling production method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4428781A (en) * | 1981-11-24 | 1984-01-31 | Uddeholms Aktiebolag | Welded steel chain |
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| CN102560248A (en) * | 2012-01-31 | 2012-07-11 | 首钢总公司 | Method for producing bolt steel |
| CN102639734A (en) * | 2009-11-25 | 2012-08-15 | 杰富意钢铁株式会社 | Welded steel pipe for linepipe with superior compressive strength and excellent sour resistance, and process for producing same |
| US20120279881A1 (en) * | 2009-01-08 | 2012-11-08 | Bio Dg, Inc. | Implantable medical devices comprising bio-degradable alloys |
| CN103789620A (en) * | 2012-11-03 | 2014-05-14 | 无锡市森信精密机械厂 | Bainite structural steel used for high strength fastener |
-
2018
- 2018-03-03 CN CN201810176744.7A patent/CN108239723A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4428781A (en) * | 1981-11-24 | 1984-01-31 | Uddeholms Aktiebolag | Welded steel chain |
| US20120279881A1 (en) * | 2009-01-08 | 2012-11-08 | Bio Dg, Inc. | Implantable medical devices comprising bio-degradable alloys |
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| CN102639734A (en) * | 2009-11-25 | 2012-08-15 | 杰富意钢铁株式会社 | Welded steel pipe for linepipe with superior compressive strength and excellent sour resistance, and process for producing same |
| CN102560248A (en) * | 2012-01-31 | 2012-07-11 | 首钢总公司 | Method for producing bolt steel |
| CN103789620A (en) * | 2012-11-03 | 2014-05-14 | 无锡市森信精密机械厂 | Bainite structural steel used for high strength fastener |
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Application publication date: 20180703 |