CN109628838A - A kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel - Google Patents
A kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel Download PDFInfo
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The present invention relates to stainless steel manufacturing technology fields, more particularly to a kind of Cutting free, it is high-intensitive, high corrosion-resisting austenite stainless steel, its component with following mass percent: C:0.01-0.12%, Si:0.2-0.8%, Mn:6.0-9.0%, Cr:18.0-20.0%, Ni:2.0-4.0%, Cu:1.0-3.0%, P≤0.060%, S:0.008-0.035%, N:0.16-0.30%, Mo≤0.30%, Nb≤0.10%, V≤0.20%, Ti≤0.10%, O:0.010-0.016%, Bi:0.0010-0.0100%, Sn:0.010-0.050%, Ca:0.0 010-0.0050%, B≤0.0050%, surplus are Fe and inevitable impurity element.The beneficial effects of the present invention are: Cutting free of the invention, high intensity, high corrosion-resisting austenite stainless steel are not only at low cost, have high corrosion resistance and good machinability, and magnetic low after finished product and cold working.
Description
Technical field
The present invention relates to stainless steel manufacturing technology fields, and in particular to a kind of Cutting free, high intensity, high corrosion-resisting austenite are not
Become rusty steel.
Background technique
With the rapid development of our country's economy, the usage amount of stainless steel is increasing, wherein the yield of free cutting stainless steel
Also increasing.Since austenite stainless steel material is soft and tacky, thermal coefficient is low, and (winding is or not the disjunction of chip difficulty when cutting
It is disconnected), point of a knife temperature rises and easily causes processing hardening, and cutting ability is relatively poor, it is therefore desirable to add Cutting free elementary sulfur
Improve cutting ability.Sulphur and manganese form manganese sulfide inclusion, this type impurity can interrupt the continuity of parent metal, promote in cutting
So that chip breaking is formed small and short crimp radius, be easy to exclude, to reduce tool wear, reduces machined surface roughness, improve
Cutter life.
Flow through category is less in the market for free cutting austenite stainless steel, and predominantly 203 and 303 series, main addition is easily cut
Elementary sulfur or selenium are cut, 203 typical compositions are Mn6Cr17Ni6Cu2, and 303 typical compositions are Cr18Ni8Cu2.303 series can also add
Add bismuth and calcium constituent, as application No. is " a kind of low-sulfur foodstuffs without toxicity contacts disclosed in 201611226044.1 Chinese invention patents
With free cutting austenite stainless steel ", 0.06-0.26% bismuth element, but bismuth element boiling point are added on 18-8 stainless steel base
Low, recovery rate of iron is extremely low.Existing free cutting austenite stainless steel nickel content is high simultaneously, causes higher cost, hinders Austria
Application of family name's body free cutting stainless steel in national product and life.
Summary of the invention
Present invention solves the technical problem that are as follows: a kind of Cutting free, high intensity, height are provided by alloying element appropriate design
Corrosion-resisting austenite stainless steel.
To achieve the goals above, the technical solution adopted by the present invention is to provide a kind of Cutting free, high intensity, high anti-corrosion Austria
Family name's body stainless steel, the component with following mass percent: C:0.01-0.12%, Si:0.2-0.8%, Mn:6.0-
9.0%, Cr:18.0-20.0%, Ni:2.0-4.0%, Cu:1.0-3.0%, P≤0.060%, S:0.008-0.035%, N:
0.16-0.30%, Mo≤0.30%, Nb≤0.10%, V≤0.20%, Ti≤0.10%, O:0.010-0.016%, Bi:
0.0010-0.0100%, Sn:0.010-0.050%, Ca:0.0010-0.0050%, B≤0.0050%, surplus is for Fe and not
Evitable impurity element.
The beneficial effects of the present invention are: Cutting free of the present invention, high intensity, high corrosion-resisting austenite stainless steel belong to Cr-Ni-
Mn-N system has stable austenite structure, nonmagnetic.Mn, N cooperation replace part Ni, so that before guaranteeing that Cr is greater than 18%
It puts and remains to obtain the single austenite structure of room temperature, compared with 203 be free cutting stainless steel, chromium content of the invention and nitrogen content
Height, spot corrosion equivalent PREN=Cr+3.3Mo+16N-0.5Mn is higher, and corrosion resistance is stronger.It is free cutting stainless steel phase with 303
Than, the present invention replaces nickel element with manganese and nitrogen, and spot corrosion equivalent and corrosion resistance are suitable, but opposite 303 precious metal Ni contents are low,
Greatly reduce production cost.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, it is explained below in conjunction with embodiment.
The most critical design of the present invention is: in Cutting free of the invention, high intensity, high corrosion-resisting austenite stainless steel, Mn,
N cooperation replaces part Ni, so that guaranteeing to remain to obtain Cutting free, high intensity, high anti-corrosion Austria under the premise of Cr content is greater than 18%
Family name's body stainless steel.
The principle that the Cutting free of system of the present invention, high intensity, high corrosion-resisting austenite stainless steel component percentages limit is as follows:
C is austenite former, can help to obtain austenite structure, excessively high easy formation carbide is most suitable for herein
For 0.03-0.12%.
Si is 0.80% hereinafter, the solution strengthening effect of Si improves material hardness, reduces cutting ability.
Mn is 6.0-9.0%, and manganese is austenite former, and addition Mn can reduce the investment of expensive alloying elements Ni,
Mn has larger help to the solubility for improving N in molten steel simultaneously.Manganese sulfide inclusion object is mainly formed by manganese and whole sulphur simultaneously,
Sulphur is reduced to thermoplastic harm.
Cr:18.0-20.0%；For the main corrosion resistance addition element of the present invention, Cr2O3 passivation protection film is produced, with
The increase of Cr content, corrosion resistance correspondingly increase.
Ni:2.0-4.0%；Stabilization of austenite is improved, good plasticity and toughness are kept.Nickel has soda acid higher resistance to
Corrosive power has antirust and temperature capacity at high temperature.Since nickel belongs to scarce resource, therefore other alloying elements should be used as far as possible
Instead of.
N:0.16-0.3%；Nitrogen can improve the intensity of steel, increase stabilization of austenite, moreover it is possible to improve corrosion resistance, but mistake
High nitrogen content can reduce the low-temperature flexibility of steel.
P:0.060% makes welding and cold hereinafter, under normal circumstances, phosphorus is harmful element in steel, increases the cold brittleness of steel
Curved degradation, but can be improved by the cooperation with copper.
S:0.008-0.035%；Sulphur is main Cutting free additive of the invention, and manganese sulfide inclusion object has cut off matrix
Continuity forms stress riser to keep vehicle bits easily broken, and lubricating action reduces the abrasion of cutter, the higher machinability of sulfur content
Can be better, but mechanical property is poorer.
Cu:1.0-3.0%；The processing hardening of steel can be reduced in the present invention, improve cutting and corrosion resisting property.
Bi:0.0010-0.0100%；Bismuth is auxiliary Cutting free additive of the invention, the processing heat generated in cutting
Keep the Bi in steel in a molten state, is cut using its embrittling effect disjunction and improve cutting ability；Meanwhile in cutting element
There is lubricating action between surface and chip and workpiece.
Sn:0.010-0.050%；Tin is auxiliary Cutting free additive of the invention, and tin is easy to crystal boundary and folder in steel
Segregation near sundries, makes steel brittleness paddy occur in cutting temperature (near 400 DEG C), improves free cutting property.
Ca:0.0010-0.0050%；Calcium is auxiliary Cutting free additive of the invention, and calcium, which can improve oxide morphology, to be made
Nodularization and enlargement, Ca system oxide can also play a protective role to tool surfaces.
B≤0.0050%；Boron can improve hot-workability, and the boron nitride being formed simultaneously can play splitting in cutting
Lubricating action, improve cutter life and machining.
The present invention removes purpose characteristic obtained from above-mentioned necessary element, can also be according to desired characteristic, and selectivity is added
Mo :≤0.30%, Nb≤0.10%；V≤0.20%；Ti≤0.10%.
Embodiment 1
A kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel, the component with following mass percent: C:
0.079%, Si:0.35%, Mn:7.0%, Cr:18.12%, Ni:3.0%, Cu:2.0%, P:0.060%, S:0.008%,
N:0.20%, Mo:0.20%, Nb:0.05%, V:0.10%, Ti:0.05%, O:0.012%, Bi:0.005%, Sn:
0.030%, Ca:0.0030%, B:0.0050%, surplus are Fe and inevitable impurity element.
Manufacturing process of the invention: blast furnace or electric arc furnaces → AOD furnace → LF furnace (or without LF furnace) → CC continuous casting → heat
Roll → be dissolved pickling → cold rolling → annealing and pickling.
Specifically, the smelting of Cutting free of the present invention, high intensity, high corrosion-resisting austenite stainless steel and processing technology are as follows:
(1) blast furnace or electric furnace smelting are passed through to above-mentioned constitutional chemistry ingredient: uses common process smelting in blast furnace or electric furnace
Make steel water.
(2) Alloying Treatment: obtained molten steel will be smelted by way of adding intermediate alloy and carries out Alloying Treatment.
(3) AOD is refined: carrying out decarburization and cr yield processing, i.e. AOD to molten steel using the nitrogen oxygen mixed gas for being passed through setting ratio
Decarburization and cr yield processing.Before tapping plus sulphur iron, (quantity of slag should be controlled at 2~4 tons in furnace), sulphur iron should be dried before being added.
(4) adjusting component: the molten steel that AOD decarburization and cr yield is handled carries out Argon processing, adjusts alloying component and control
Nitrogen processing finally taps molten steel adjusted to ladle.
(5) LF refining: being refined in ladle refining furnace, is carried out trimming and the processing of degassing decontamination, is precisely controlled
Alloyage element within the specified scope, obtains the good molten steel of degree of purity, and LF adds sulphur iron, presses target S content in steel before outbound
Investment.
(6) CC continuous casting: use common process continuous casting for slab or square billet or round billet.
(7) hot rolling: to prevent rolling straight on the head, using 1200-1350 DEG C of elevated heating processes, by slab or square billet or round billet
Rolling is plate or bar.
(8) be dissolved pickling: plate or bar to hot rolling carry out solution heat treatment, carbide are dissolved again to matrix,
Sensitization phenomenon and pickling processes are avoided, the good solid solution state stainless steel of surface quality is obtained.
The austenitic stainless steel rod iron that diameter is 20mm is obtained by the above-mentioned manufacture method.Its room-temperature yield strength Rp0.2
It is 672MPa for 306MPa, tensile strength Rm, elongation after fracture 54.5%, relative permeability 1.0025ur is opposite to cut
Cutting property Kv is 1.82.
Embodiment 2
A kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel, the component with following mass percent: C:
0.01%, Si:0.2%, Mn:6.0%, Cr:18.0%, Ni:2.0%, Cu:1.0%, P:0.060%, S:0.015%, N:
0.16%, Mo:0.30%, Nb:0.10%, V:0.20%, Ti:0.10%, O:0.010%, Bi:0.0010%, Sn:
0.010%, Ca:0.0010%, B:0.0050%, surplus are Fe and inevitable impurity element.Manufacturing method such as embodiment
1。
The austenitic stainless steel rod iron that diameter is 20mm is obtained by the above-mentioned manufacture method.Its room-temperature yield strength Rp0.2
It is 676MPa, elongation after fracture 55%, relative permeability 1.0018ur, opposite machinable for 297MPa, tensile strength Rm
Property Kv be 1.9.
Embodiment 3
A kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel, the component with following mass percent: C:
0.12%, Si:0.8%, Mn:9.0%, Cr:20.0%, Ni:4.0%, Cu:3.0%, P:0.060%, S:0.035%, N:
0.30%, Mo:0.30%, Nb:0.10%, V:0.20%, Ti:0.10%, O:0.016%, Bi:0.0100%, Sn:0.010-
0.050%, Ca:0.0050%, B:0.0050%, surplus are Fe and inevitable impurity element.Manufacturing method such as embodiment
1。
The austenitic stainless steel rod iron that diameter is 20mm is obtained by the above-mentioned manufacture method.Its room-temperature yield strength Rp0.2
For 302MPa, tensile strength Rm is 680MPa, elongation after fracture 53.5%, and relative permeability 1.0021ur is opposite to cut
Cutting property Kv is 1.85.
Embodiment 4
The component with following mass percent: a kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel have
The component of following mass percent: C:0.010%, Si:0.45%, Mn:8.0%, Cr:19.0%, Ni:3.0%, Cu:
1.5%, P:0.050%, S:0.030%, N:0.25%, Mo:0.25%, Nb:0.03%, V:0.15%, Ti:0.06%, O:
0.013%, Bi:0.006%, Sn:0.040%, Ca:0.0030%, B:0.0050%, surplus are Fe and inevitable impurity
Element.Manufacturing method such as embodiment 1.
The austenitic stainless steel rod iron that diameter is 20mm is obtained by the above-mentioned manufacture method.Its room-temperature yield strength Rp0.2
It is 662MPa, elongation after fracture 57%, relative permeability 1.0019ur, opposite machinable for 290MPa, tensile strength Rm
Property Kv be 1.96.
Comparative example
Cutting free, high intensity obtained by the above embodiment of the present invention, high corrosion-resisting austenite stainless steel and SUS303Cu and
Opposite machinability and the mechanical property comparison of S20300 see the table below 1.
Table 1
Cutting free of the present invention, high intensity, high corrosion-resisting austenite stainless steel material has and 304 comparable resistance to spot corrosion
Can, and relative permeability is better than 304 austenitic stainless steels, opposite machinability is slightly below SUS303Cu, this is because 303Cu
Copper content is up to 2.4%, and cold-forming property is good, but its cost is excessively high.Cutting free of the present invention, high intensity, high corrosion-resisting austenite are not
The Steel material spot corrosion equivalent that becomes rusty is higher than S20300, and opposite machinability, relative permeability and mechanical property are superior to S20300.This
Invention Cutting free, high intensity, high corrosion-resisting austenite stainless steel material are with high corrosion-resistant, good machinability and high property
Valence is than with the high market competitiveness.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright description are applied directly or indirectly in relevant technical field, are similarly included in this hair
In bright scope of patent protection.
Claims (5)
1. a kind of Cutting free, high intensity, high corrosion-resisting austenite stainless steel, which is characterized in that with following mass percent
Component: C:0.01-0.12%, Si:0.2-0.8%, Mn:6.0-9.0%, Cr:18.0-20.0%, Ni:2.0-4.0%, Cu:
1.0-3.0%, P≤0.060%, S:0.008-0.035%, N:0.16-0.30%, Mo≤0.30%, Nb≤0.10%, V≤
0.20%, Ti≤0.10%, O:0.010-0.016%, Bi:0.0010-0.0100%, Sn:0.010-0.050%, Ca:
0.0010-0.0050%, B≤0.0050%, surplus are Fe and inevitable impurity element.
2. Cutting free according to claim 1, high intensity, high corrosion-resisting austenite stainless steel, which is characterized in that have as follows
Mass percent component: C:0.079%, Si:0.35%, Mn:7.0%, Cr:18.12%, Ni:3.0%, Cu:2.0%,
P:0.060%, S:0.20%, N:0.008%, Mo:0.20%, Nb:0.05%, V:0.10%, Ti:0.05%, O:
0.012%, Bi:0.005%, Sn:0.030%, Ca:0.0030%, B:0.0050%, surplus are Fe and inevitable impurity
Element.
3. Cutting free according to claim 1, high intensity, high corrosion-resisting austenite stainless steel, which is characterized in that have as follows
Mass percent component: C:0.01%, Si:0.2%, Mn:6.0%, Cr:18.0%, Ni:2.0%, Cu:1.0%, P:
0.060%, S:0.015%, N:0.16%, Mo:0.30%, Nb:0.10%, V:0.20%, Ti:0.10%, O:0.010%,
Bi:0.0010%, Sn:0.010%, Ca:0.0010%, B:0.0050%, surplus are Fe and inevitable impurity element.
4. Cutting free according to claim 1, high intensity, high corrosion-resisting austenite stainless steel, which is characterized in that have as follows
Mass percent component: C:0.12%, Si:0.8%, Mn:9.0%, Cr:20.0%, Ni:4.0%, Cu:3.0%, P:
0.060%, S:0.035%, N:0.30%, Mo:0.30%, Nb:0.10%, V:0.20%, Ti:0.10%, O:0.016%,
Bi:0.0100%, Sn:0.010-0.050%, Ca:0.0050%, B:0.0050%, surplus are Fe and inevitable impurity
Element.
5. Cutting free according to claim 1, high intensity, high corrosion-resisting austenite stainless steel, which is characterized in that have as follows
Mass percent component: C:0.010%, Si:0.45%, Mn:8.0%, Cr:19.0%, Ni:3.0%, Cu:1.5%,
P:0.050%, S:0.030%, N:0.25%, Mo:0.25%, Nb:0.03%, V:0.15%, Ti:0.06%, O:
0.013%, Bi:0.006%, Sn:0.040%, Ca:0.0030%, B:0.0050%, surplus are Fe and inevitable impurity
Element.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111394641A (en) * | 2020-04-16 | 2020-07-10 | 泰州俊宇不锈钢材料有限公司 | Production process of sulfur-containing free-cutting austenitic stainless steel alloy material |
| CN112609134A (en) * | 2020-12-31 | 2021-04-06 | 宁波耀义新材料有限公司 | Novel austenite free-cutting stainless steel material |
| WO2021129836A1 (en) * | 2019-12-26 | 2021-07-01 | 华新丽华股份有限公司 | Corrosion-resistant free-cutting steel |
| CN113235019A (en) * | 2021-05-20 | 2021-08-10 | 成都先进金属材料产业技术研究院股份有限公司 | Fe-Mn-Al-N-S series high-nitrogen low-density free-cutting steel bar and preparation method thereof |
| CN115505846A (en) * | 2022-09-26 | 2022-12-23 | 福建青拓特钢技术研究有限公司 | 303 free-cutting stainless steel wire rod with high surface quality and manufacturing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111394641A (en) * | 2020-04-16 | 2020-07-10 | 泰州俊宇不锈钢材料有限公司 | Production process of sulfur-containing free-cutting austenitic stainless steel alloy material |
| CN112609134A (en) * | 2020-12-31 | 2021-04-06 | 宁波耀义新材料有限公司 | Novel austenite free-cutting stainless steel material |
| CN113235019A (en) * | 2021-05-20 | 2021-08-10 | 成都先进金属材料产业技术研究院股份有限公司 | Fe-Mn-Al-N-S series high-nitrogen low-density free-cutting steel bar and preparation method thereof |
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