CN109763062A - A kind of environment-protective free-cutting stainless steel and preparation method thereof - Google Patents
A kind of environment-protective free-cutting stainless steel and preparation method thereof Download PDFInfo
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- CN109763062A CN109763062A CN201810446794.2A CN201810446794A CN109763062A CN 109763062 A CN109763062 A CN 109763062A CN 201810446794 A CN201810446794 A CN 201810446794A CN 109763062 A CN109763062 A CN 109763062A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of environment-protective free-cutting stainless steels, by weight percentage comprising 0.04% or more C, 1.0% Si below, 2.0% Mn below, 0.060% P below, 0.25~0.35% S, 0.05~1.0% Cu, 8.5~10.0% Ni, 17.0~19.0% Cr, 0.5% Mo, 0.070% N and iron below and inevitable impurity below.Its technology that is quality stabilization, can produce in batches is mainly used for the free cutting stainless steel 303F of iron and steel enterprise's quality of production qualification.
Description
Technical field
The present invention relates to stainless steels, more specifically refer to a kind of environment-protective free-cutting stainless steel and preparation method thereof.
Background technique
With the development in stainless steel market, need to further increase the processing performance and environmental-protecting performance of material, current is easy
The kind that cuts stainless steel is not able to satisfy the requirement of environmental-protecting performance.The low manganese environment protection type easy of low copper cuts stainless steel increasingly by market
Favor, has a extensive future.All the time, Baosteel special steel Chang Cai Co., Ltd is produced using the technique of electroslag furnace addition copper and manganese
303CuS2 steel grade, Cu content 2.0~2.5%, Mn content 2.0~3.0%, sulfur content control are cut 0.25~0.30%
Better performances, but Cu, Mn higher, element are easily precipitated and are harmful to the human body.
Summary of the invention
The object of the present invention is to provide a kind of environment-protective free-cutting stainless steel and preparation method thereof, the stainless steel quality is stable,
It can produce in batches, meet ecological requirements.
To achieve the goals above, the present invention uses following technical scheme.
On the one hand, a kind of environment-protective free-cutting stainless steel, by weight percentage comprising 0.04% or more C, 1.0% or less
Si, 2.0% Mn below, 0.060% P below, 0.25~0.35% S, 0.05~1.0% Cu, 8.5~10.0%
Ni, 17.0~19.0% Cr, 0.5% Mo, 0.070% N and iron below and inevitable impurity below.
The C is 0.04~0.08%.
The Si is 0.05~1.0%.
The Mn is 1.0~2.0%.
On the other hand, a kind of preparation method of environment-protective free-cutting stainless steel is successively smelted by EAF, and AOD smelts, LF smelting
Refining, continuous casting, high speed wire rolling, annular furnace solution treatment, pickling are packed to complete to prepare.
During AOD smelts, terminal C content≤0.020% is restored again before control AOD is restored；The lime for controlling AOD is added
Amount is 40~50kg/t molten steel；AOD whole process Argon obtains finished product N≤0.07% to reduce nitrogen content.
In LF smelting, carbon content smelts control range 0.03~0.05%；LF line feeding uses high S core-spun yarn, and sulphur contains
Amount control sampling analysis after 45%~50%, line feeding carries out bull ladle continuous casting when S is 0.025~0.035%.
In high speed wire rolling, using intermediate base on-line heating, heating temperature sets 1050 ± 50 DEG C, bites and is rolled using dry head
Technology processed.
In annular furnace solution treatment,
When annular furnace temperature >=700 DEG C are into annular furnace, temperature is kept the temperature after reaching 1050 DEG C, and holding temperature control exists
1040~1070 DEG C, 30~80min of soaking time, then direct hardening to room temperature.
It is also handled by salt bath before pickling.
It is easy to operate using environment-protective free-cutting stainless steel and preparation method thereof of the invention, meet mass production requirement, is not required to
Great deal of investment is wanted, using existing stainless steel equipment and wire feeder, carries out feeding S alloying.It is online using intermediate base when rolling
The technology of heating and the rolling of dry head, guarantees material processing performance.It meets the requirements and stablizes using this technique quality of production.Steel
Sulfur content control is stablized in liquid, and the recovery rate of S is relatively high, and qualification rate has reached 100%, and more environmentally friendly.
Detailed description of the invention
Fig. 1 is the temperature line chart of annular furnace solution treatment of the invention.
Specific embodiment
Technical solution of the present invention is further illustrated with reference to the accompanying drawing.
Environment-protective free-cutting stainless steel of the invention, by weight percentage comprising 0.04% or more C, 1.0% below
Si, 2.0% Mn below, 0.060% P below, 0.25~0.35% S, 0.05~1.0% Cu, 8.5~10.0%
Ni, 17.0~19.0% Cr, 0.5% Mo, 0.070% N and iron below and inevitable impurity below.
In order to reduce Material Strength, guarantee to generate austenite structure and nonmagnetic, preferably, the C be 0.04~
0.08%.
In order to guarantee enough cutting abilities, preferably, the Si is 0.05~1.0%.
Preferably, the Mn is 1.0~2.0%.
Above-mentioned environment-protective free-cutting stainless steel is smelted the preparation method comprises the following steps: successively passing through electric furnace (abbreviation EAF), Ar-O_2 furnace
(abbreviation AOD) smelt, ladle refining furnace (abbreviation LF) smelt, continuous casting, high speed wire rolling, annular furnace solution treatment, pickling, packaging with
Complete preparation.
Before ladle refining furnace (LF) feeds S line, clear reducing slag is first taken off as far as possible；Steel rolling, which bites, rolls skill using dry head
Art；Annular furnace is dissolved system using the common 1050 DEG C of solid solutions of stainless steel wire rod.It is handled before pickling by salt bath, guarantees surface matter
Amount.
Also, in smelting process,
1) it is 0.04% that ladle refining furnace (LF) carbon content, which smelts control target, and scope control is 0.03~0.05%.Control
Terminal C content≤0.020% restores again before Ar-O_2 furnace (AOD) processed restores.Control Ar-O_2 furnace (AOD) lime adding amount be
40~50kg/t molten steel, it is ensured that the preferable quantity of slag and basicity of slag.
2) whole Argon in Ar-O_2 furnace (AOD) smelting process, reduces nitrogen content, guarantees finished product N≤0.07%.
3) the high S core-spun yarn of ladle refining furnace (LF) line feeding is used, sulfur content control is fed low 45%~50% with replacement
S core-spun yarn, sampling analysis after line feeding carry out bull ladle casting when S is 0.025~0.035%.
4) continuous casting: when temperature reaches 1523~1528 DEG C, ladle turret is hung on, is poured using bow type continuous casting machine
Note.
In high speed wire rolling, using intermediate base on-line heating, heating temperature sets 1050 ± 50 DEG C, bites and is rolled using dry head
Technology processed guarantees material processing performance.
In annular furnace solution treatment, annular furnace temperature >=700 DEG C reach into annular furnace, heating rate without limitation, temperature
It is kept the temperature after 1050 DEG C, 1070 DEG C of maximum temperature, 1040 DEG C of minimum temperature, soaking time 30~40min of hot charging, cold charge 50
~80min, then direct hardening to room temperature, is shown in Fig. 1.
Solid solubility temperature is lower, and not only intensity is high after wire rod heat treatment, and strength fluctuation range is also big, unstable quality.Gu but
Solubility temperature is too high, will cause surface oxide layer and thickens, and corresponding pickling time lengthens, and rough surface influences the use of user.By
Multiple comparison test and data accumulation.Solid solubility temperature controls 1040-1070 DEG C, adjusts solution time according to the specification of wire rod, right
Surface quality after pickling has no adverse effects, and is handled by salt bath, has good surface quality after making pickling.
Embodiment 1
Sulfur-bearing cupric free cutting stainless steel BT303F is successfully smelted using invention, key step is as follows:
1) ultra high electric arc furnace (slot type pitch furnace lining) is first passed through, using certain voltage and current melting waste steel.The
Two basket material are powered after fusing, and oxygen blast is fluxing after the melting down > 80% of the second basket material.Oxygen consumes 205m3, is added 200kg's before tapping
SiFe reduction, and draw slag abundant, slag discharge amount≤500kg is controlled, tapping temperature is controlled at 1650 DEG C.Composition Control C when tapping:
1.02%, P:0.036%.According to sampling ingredient, tapping process is added electrolytic copper plate 1050kg with steel stream, Cu content is adjusted
To 2.8%, tap 55.0t.
2) AOD is operated: after AOD converts steel, 1000kg lime and the light-burned Mg ball of 800kg is added.It is carried out by AOD blowing model
Blowing.Sampling analysis C content, C content are restored when being 0.02%.Reduction process calculates needs according to blowing oxygen quantity
The lime of 980kgSiFe (usually in 700~1200kg), 400kg fluorite and 1200kg, 3/4 cinder ladle of manually skimming after reduction
(the bits weight of 3/4 cinder ladle is 3000kg).
3) ladle refining: after AOD tapping, ladle LF in place.When it is 1580 DEG C that temperature, which reaches, start to feed high S sulphur line (sulphur
Content >=50%), wire-feeding velocity 2.0m/s, according to initial 0.04% feed quantity of sulfur content in 1250m.Sampling point after line feeding
Analysis, when S is 0.028%, bull ladle casting.
4) even note: when temperature reaches 1525 DEG C, hang on ladle turret, using 160 side, 3 machine 3 flow bow type continuous casting machine into
Row casting.
5) long profiles roll: the dry head rolling of technology when rolling using intermediate base on-line heating guarantees material processing performance.
Based on contract need to be rolled into the coiling of φ 5.5~30.
6) annular furnace solution treatment: temperature is 730 DEG C into annular furnace, and heating rate is without limitation, after temperature reaches 1050 DEG C
It is kept the temperature, 1070 DEG C of maximum temperature, 1040 DEG C of minimum temperature, soaking time 30min is finally cooled to room temperature.Pass through salt bath
Processing has good surface quality after making pickling.
In conclusion smelting (EAF+AOD+LF smelting) is combined using electric arc furnaces, AOD and the concise equipment of ladle,
Process characteristic is: sulphur: 0.25~0.35%, Cu:0.5~1.0%, Ni:8..5~10.0%, Ni, S content is improved, when rolling
Technology using the heating of intermediate base and the rolling of dry head guarantees materials hot working performance, that is, has extension property more carefully, also have very
Good cutting ability, dense structure.The recovery rate of S is relatively high, can organize to produce in batches, has good cutting, belongs to
Environment-protective free-cutting stainless steel.And solid solution strength is met the requirements, and surface quality is good.It efficiently solves harmful because reducing copper, manganese
Element roll when poor processability and other smelting process sulfur contents control it is unstable, recovery rate it is relatively low and the problem of.Rolling
It is later up-to-standard, it is fully able to meet performance requirements, the performances such as steel grade environmental protection and cutting and meets the requirement of user, there is environmental protection
Property, steel product quality is improved, can be produced in batches.Have no adverse effects to the surface quality after pickling, properties of product it is steady
It is fixed.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as the change in spirit of the invention, to embodiment described above
Change, modification will all be fallen within the scope of claims of the present invention.
Claims (10)
1. a kind of environment-protective free-cutting stainless steel, it is characterised in that: by weight percentage comprising 0.04% or more C, 1.0% with
Under Si, 2.0% Mn below, 0.060% P below, 0.25~0.35% S, 0.05~1.0% Cu, 8.5~
10.0% Ni, 17.0~19.0% Cr, 0.5% Mo below, 0.070% N and iron below and inevitably miscellaneous
Matter.
2. environment-protective free-cutting stainless steel as described in claim 1, it is characterised in that: the C is 0.04~0.08%.
3. environment-protective free-cutting stainless steel as described in claim 1, it is characterised in that: the Si is 0.05~1.0%.
4. environment-protective free-cutting stainless steel as described in claim 1, it is characterised in that: the Mn is 1.0~2.0%.
5. the preparation method of the stainless steel such as any one of Claims 1 to 4, it is characterised in that: successively smelted by EAF, AOD
It smelts, LF smelts, continuous casting, high speed wire rolling, annular furnace solution treatment, pickling, packs to complete to prepare.
6. such as the preparation method of the stainless steel in claim 5, it is characterised in that: in AOD smelting, before control AOD reduction eventually
Point C content≤0.020% restores again；The lime adding amount for controlling AOD is 40~50kg/t molten steel；AOD whole process Argon with
Nitrogen content is reduced, finished product N≤0.07% is obtained.
7. such as the preparation method of the stainless steel in claim 5, it is characterised in that: in LF smelting, carbon content smelts control model
It is trapped among 0.03~0.05%；LF line feeding uses high S core-spun yarn, and sulfur content controls the sampling analysis after 45%~50%, line feeding, when
When S is 0.025~0.035%, bull ladle continuous casting is carried out.
8. such as the preparation method of the stainless steel in claim 5, it is characterised in that: online using intermediate base in high speed wire rolling
Heating, heating temperature set 1050 ± 50 DEG C, bite using dry head rolling technique.
9. such as the preparation method of the stainless steel in claim 5, it is characterised in that: in annular furnace solution treatment,
When annular furnace temperature >=700 DEG C are into annular furnace, temperature is kept the temperature after reaching 1050 DEG C, holding temperature control 1040~
1070 DEG C, 30~80min of soaking time, then direct hardening to room temperature.
10. such as the preparation method of the stainless steel in claim 5, it is characterised in that: also handled by salt bath before pickling.
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| CN201810446794.2A CN109763062A (en) | 2018-05-11 | 2018-05-11 | A kind of environment-protective free-cutting stainless steel and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819913A (en) * | 2019-11-27 | 2020-02-21 | 攀钢集团江油长城特殊钢有限公司 | Chalcogenide free-cutting stainless steel and preparation method thereof |
| CN114959470A (en) * | 2022-05-19 | 2022-08-30 | 盐城市联鑫钢铁有限公司 | Production process of S32168 high-quality stainless steel continuous casting billet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS613872A (en) * | 1984-06-15 | 1986-01-09 | Aichi Steel Works Ltd | Free-cutting austenitic stainless steel having excellent drawability |
| CN101397633A (en) * | 2007-09-30 | 2009-04-01 | 宝山钢铁股份有限公司 | Sulphur and copper-containing free-cutting stainless steel and preparation method thereof |
| CN106636893A (en) * | 2016-11-25 | 2017-05-10 | 邢台钢铁有限责任公司 | Stainless steel wire rod easy to cut and manufacturing method thereof |
-
2018
- 2018-05-11 CN CN201810446794.2A patent/CN109763062A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS613872A (en) * | 1984-06-15 | 1986-01-09 | Aichi Steel Works Ltd | Free-cutting austenitic stainless steel having excellent drawability |
| CN101397633A (en) * | 2007-09-30 | 2009-04-01 | 宝山钢铁股份有限公司 | Sulphur and copper-containing free-cutting stainless steel and preparation method thereof |
| CN106636893A (en) * | 2016-11-25 | 2017-05-10 | 邢台钢铁有限责任公司 | Stainless steel wire rod easy to cut and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819913A (en) * | 2019-11-27 | 2020-02-21 | 攀钢集团江油长城特殊钢有限公司 | Chalcogenide free-cutting stainless steel and preparation method thereof |
| CN114959470A (en) * | 2022-05-19 | 2022-08-30 | 盐城市联鑫钢铁有限公司 | Production process of S32168 high-quality stainless steel continuous casting billet |
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Application publication date: 20190517 |