CN106270494B - Nonmagnetic steel product and its powder metallurgically manufacturing method - Google Patents

Nonmagnetic steel product and its powder metallurgically manufacturing method Download PDF

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Publication number
CN106270494B
CN106270494B CN201610858968.7A CN201610858968A CN106270494B CN 106270494 B CN106270494 B CN 106270494B CN 201610858968 A CN201610858968 A CN 201610858968A CN 106270494 B CN106270494 B CN 106270494B
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powder
nonmagnetic steel
metallurgically
prealloy
steel
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CN106270494A (en
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朱权利
肖志瑜
陈家坚
马超
吴苑标
刘军
潘永汉
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Guangdong Guangdong Joaquin Polytron Technologies Inc
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Guangdong Guangdong Joaquin Polytron Technologies Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F1/00Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition
    • B22F1/0003Metallic powders per se; Mixtures of metallic powders; Metallic powders mixed with a lubricating or binding agent
    • B22F1/0059Metallic powders mixed with a lubricating or binding agent or organic material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/60Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Abstract

The present invention relates to a kind of nonmagnetic steel product and its powder metallurgically manufacturing methods.The powder metallurgically manufacturing method includes the following steps: prepared by Fe-Mn prealloy powder: the Fe-Mn prealloy powder includes the ingredient of following weight percent: Mn 20~50%, C 0.2~0.6%, Si 0.5~1.2%, S≤0.05%, P≤0.1%, O≤1.15%, surplus Fe;Other alloy powders and binder are added in the Fe-Mn prealloy powder, is formed after mixing, obtains green compact;The green compact are sintered, the nonmagnetic steel product is obtained.The nonmagnetic steel product size that this method is prepared is stable, density is high, obdurability is good, and manufacturing method is simple, manufacturing cost is low.

Description

Nonmagnetic steel product and its powder metallurgically manufacturing method
Technical field
The present invention relates to powder metallurgical technologies, more particularly to a kind of nonmagnetic steel product and its powder metallurgically manufacturing side Method.
Background technique
The purposes of nonmagnetic steel is very extensive, in automatic control system, precision instrument, telecommunication and motor and many military affairs It is required in field using nonmagnetic steel.Such as with the development of refrigeration industry, the demand of compressor is increasing, flat in compressor Block effect of weighing is great, maintains the steady state of crankshaft when rotating at high speed.Material used in balance weight is from copper at high cost It is iron-based that base gradually uses lower-cost potassium steel instead, and material is required to not carrying magnetic or is not magnetized.
Currently, the nonmagnetic steel product of such as balance weight mainly uses hot investment casting or forging technology to prepare.And hot investment casting Or the production cycle of forging is longer, higher cost, simultaneously because the size of equipment constantly becomes smaller, the size of nonmagnetic steel product also exists Reduce, discomfort shares hot investment casting or forging to produce.Therefore it is increasingly difficult to using traditional hot investment casting or forging technology full The demand in sufficient market.
Existing powder metallurgically manufacturing nonmagnetic steel technique since the intensity of Fe-Mn alloyed powder is high, and has strong processing The characteristic of hardening causes powder briquettability and formability poor, and green strength is low, make sintered metal product density and obdurability compared with Difference, and according to element powder Mn powder and the common compression moulding of Fe powder, distillation generates biggish steam when sintering due to Mn high temperature Pressure, material alloysization are difficult, and the requirement of nonmagnetic, high density and obdurability is not achieved.
Based on this, the part prior art is to improve the density of powder compacting product, and WC element powder is added in Fe-Mn alloyed powder End is suppressed, and improves green density with the high specific gravity of WC element powders, but since WC plasticity difference is difficult to compression moulding, because This need to can just be formed using high velocity compacted, this method pressing process higher cost.
Summary of the invention
Based on this, it is necessary to provide a kind of high density, the nonmagnetic steel product that obdurability is good, method is simple, manufacturing cost is low Powder metallurgically manufacturing method.
A kind of powder metallurgically manufacturing method of nonmagnetic steel product, includes the following steps:
The preparation of Fe-Mn prealloy powder: the Fe-Mn prealloy includes the ingredient of following weight percent: Mn20~50%, C 0.2~0.6%, Si 0.5~1.2%, S≤0.05%, P≤0.1%, O≤1.15%, surplus Fe;
Cu powder, Cr powder, Ni powder, P powder and Fe powder are added in the Fe-Mn prealloy powder, obtains alloy powder;Then at described Binder is added in alloy powder, compression moulding after mixing obtains green compact;Wherein, the alloy powder by weight percentage, Including Fe-Mn prealloy powder 60~90%, Cu powder 10~25%, Cr powder 0~5%, Ni powder 0~5%, P powder 0~2% and Fe powder 0 ~30%;
The green compact are sintered, the nonmagnetic steel product is obtained.
Above-mentioned alloy powder is preferably, by weight percentage, including the Fe-Mn prealloy powder 60~80%, Cu powder 15~25%, Cr powder 1~5%, Ni powder 1~5%, P powder 1~2% and Fe powder 2~4%.
The size distribution of the Fe-Mn prealloy powder is 80~300 mesh in one of the embodiments,.The size distribution Refer to the size distribution of the Fe-Mn prealloy powder under sieving after being sieved.
After the Fe-Mn prealloy is by A3 steel, graphite and the smelting mixing of electrolytic manganese in one of the embodiments, adopt It is prepared with water atomization.
A3 steel refers to that standard chemical ingredient is the steel of Fe and C, and A3 is steel mark, and 3 refer to its phosphorus content 0.003%.
The nonmagnetic steel product includes the ingredient of following weight percent in one of the embodiments: Mn16~30%, Cu 10~25%, C 0.12~0.6%, Si 0.5~1.2%, S≤0.1%, Cr≤5%, Ni≤5%, P≤2%, surplus For Fe.
The green density is 5.8~6.4g/cm in one of the embodiments,3
The temperature of the sintering is 1150 DEG C~1200 DEG C in one of the embodiments, 1~2h of time.
The additional amount of the binder is the 0.6~1.0% of the alloy powder weight in one of the embodiments,.
The binder is zinc stearate in one of the embodiments,.
The nonmagnetic steel product is balance weight in one of the embodiments,.
The present invention also provides the nonmagnetic steel products that the powder metallurgically manufacturing method of the nonmagnetic steel product manufactures.
Compared with prior art, the invention has the following advantages:
The invention discloses a kind of powder metallurgically manufacturing methods of nonmagnetic steel product.This method uses the compound side with powder Method first prepares Fe-Mn prealloy powder, then further add Fe powder, Cu powder (preferably further in Fe-Mn prealloy powder Add P powder, Ni powder, Cr powder) etc. elements powder to prepare alloy powder, and in reasonable disposition alloy powder Fe-Mn prealloy powder with The ingredient of element powder mixes Fe-Mn prealloy powder and element powder since element powder has preferable briquettability and formability Afterwards, it can effectively solve the problem that the problem of prealloy Fe-Mn powder compressibility and formability difference, gained alloy powder compressibility is good, uses Standard machinery press can compression moulding, nonmagnetic steel product size obtained is stable, density can reach 7.3~7.5g/cm3, resist Tensile strength reaches 380~480MPa, and elongation is up to 3~5%.
Compared with prior art, the powder metallurgically manufacturing method of nonmagnetic steel product of the invention not only nonmagnetic steel product properties Height, and it is simple process, at low cost, it can be used for the occasion high to mechanical property requirements, substantially extend existing nonmagnetic steel product Industrial applications range.
In addition, rationally controlling the technological parameter of each step, it can be further ensured that the Optimality of nonmagnetic steel product obtained Energy.
Specific embodiment
Nonmagnetic steel product of the invention and its powder metallurgically manufacturing method are made below in conjunction with specific embodiment further detailed Thin explanation.
The size distribution for the Fe-Mn prealloy powder that the present invention uses for 80~300 mesh, the preparation method is as follows:
According to required Fe-Mn prealloy powder ingredient, A3 steel is placed in intermediate frequency furnace after heating fusing according to a certain ratio, is added Enter electrolytic manganese and graphite;After melting down, with ferrosilicon deoxidation, Fe-Mn prealloy powder is prepared using water atomization.
Embodiment 1
A kind of powder metallurgically manufacturing method of nonmagnetic steel product (balance weight) of the present embodiment, includes the following steps:
A) firstly, being by weight percentage Fe-Mn prealloy powder 60%, Cu powder 25%, Cr powder 5%, Ni powder 5%, P powder 1%, remaining as Fe powder, mixed-powder is prepared, the zinc stearate (binder) of the mixed-powder total weight 0.6% is added, used Mixed powder machine stirs evenly spare;
Wherein, Fe-Mn prealloy powder includes the ingredient of following weight percent: Mn 50%, C 0.2%, Si 1%, S≤ 0.05%, P≤0.1%, O≤1.15%, surplus Fe.
B) it send mixed mixed-powder to standard machinery press compression moulding, the green compact of balance weight is made, density domination exists 6.4g/cm3
C) green compact of compacting are sintered in pushing away boat furnace, sintering temperature is 1150 DEG C~1200 DEG C, sintering time 1.5h。
D) polishing deburring processing is carried out to sintered green compact, gained balance weight includes following weight percent Ingredient: Mn 30%, Cu 25%, C 0.12%, Si 0.6%, S≤0.1%, Cr 5%, Ni 5%, P 1%, surplus are Fe。
Embodiment 2
A kind of powder metallurgically manufacturing method of nonmagnetic steel product (balance weight) of the present embodiment, includes the following steps:
A) firstly, Fe-Mn prealloy powder 80%, Cu powder 15%, Cr powder 1%, Ni powder 1%, P powder 1% by weight percentage, Remaining as Fe powder, mixed-powder is prepared, the zinc stearate (binder) of the mixed-powder total weight 0.8% is added, with mixed powder Machine stirs evenly spare;
Wherein, Fe-Mn prealloy powder includes the ingredient of following weight percent: Mn 30%, C 0.3%, Si0.8%, S ≤ 0.05%, P≤0.1%, O≤1.15%, surplus Fe.
B) it send mixed mixed-powder to standard machinery press compression moulding, the green compact of balance weight is made, density domination exists 6.0g/cm3
C) green compact of compacting are sintered in pushing away boat furnace, sintering temperature is 1150 DEG C~1200 DEG C, sintering time 1.5h。
D) polishing deburring processing is carried out to sintered green compact, gained balance weight includes following weight percent Ingredient: Mn 24%, Cu 15%, C 0.24%, Si 0.64%, S≤0.1%, Cr1%, Ni 1%, P 1%, surplus are Fe。
Embodiment 3
A kind of powder metallurgically manufacturing method of nonmagnetic steel product (balance weight) of the present embodiment, includes the following steps:
A) firstly, it is mixed to add this for Fe-Mn prealloy powder 90%, Cu powder 10%, preparation mixed-powder by weight percentage The zinc stearate (binder) for closing powder total weight 1.0%, is stirred evenly spare with mixed powder machine;
Wherein, Fe-Mn prealloy powder includes the ingredient of following weight percent: Mn 20%, C 0.6%, Si0.6%, S ≤ 0.05%, P≤0.1%, O≤1.15%, surplus Fe.
B) it send mixed mixed-powder to standard machinery press compression moulding, the green compact of balance weight is made, density domination exists 5.8g/cm3
C) green compact of compacting are sintered in pushing away boat furnace, sintering temperature is 1150 DEG C~1200 DEG C, sintering time 1.5h。
D) polishing deburring processing is carried out to sintered green compact, gained balance weight includes following weight percent Ingredient: Mn 18%, Cu 10%, C 0.54%, Si 0.54%, S≤0.1%, surplus Fe.
Comparative example
A kind of powder metallurgically manufacturing method of nonmagnetic steel product (balance weight) of this comparative example, includes the following steps:
A) firstly, according to Mn 20%, Cu 15%, C 0.5%, Si 1%, S≤0.5%, Cr 2%, Ni 2%, P 1%, surplus Fe prepare mixed-powder, are stirred evenly with mixed powder machine spare.
B) it send mixed alloy powder to standard machinery press compression moulding, the green compact of balance weight is made, density domination exists 6.2g/cm3
C) green compact of compacting are sintered in pushing away boat furnace, sintering temperature is 1150 DEG C~1200 DEG C, sintering time 1.5h。
D) polishing deburring processing is carried out to sintered green compact, gained balance weight includes following weight percent Ingredient: Mn 20%, Cu 15%, C 0.5%, Si 1%, S≤0.5%, Cr 2%, Ni 2%, P 1%, surplus Fe.
The performance test results of embodiment 1-3 and comparative example are as shown in table 1.
Table 1
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims (9)

1. a kind of powder metallurgically manufacturing method of nonmagnetic steel product, which comprises the steps of:
The preparation of Fe-Mn prealloy powder: the Fe-Mn prealloy powder includes the ingredient of following weight percent: Mn 20~50%, C 0.2~0.6%, Si 0.5~1.2%, S≤0.05%, P≤0.1%, O≤1.15%, surplus Fe;
Cu powder, Cr powder, Ni powder, P powder and Fe powder are added in the Fe-Mn prealloy powder, obtains alloy powder;Then at the alloy Binder is added in powder, compression moulding after mixing obtains green compact;Wherein, the alloy powder by weight percentage, including The Fe-Mn prealloy powder 60~80%, Cu powder 15~25%, Cr powder 1~5%, Ni powder 1~5%, P powder 1~2% and Fe powder 2 ~4%;
The green compact are sintered, the nonmagnetic steel product is obtained.
2. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 1, which is characterized in that the Fe-Mn is pre- The size distribution of alloyed powder is 80~300 mesh.
3. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 1, which is characterized in that the Fe-Mn is pre- After alloyed powder is by A3 steel, graphite and the smelting mixing of electrolytic manganese, it is prepared using water atomization.
4. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 1, which is characterized in that the green density For 5.8~6.4g/cm3
5. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 1, which is characterized in that the temperature of the sintering Degree is 1150 DEG C~1200 DEG C, 1~2h of time.
6. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 1-5, which is characterized in that described The additional amount of binder is the 0.6~1% of the alloy powder weight.
7. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 6, which is characterized in that the binder is Zinc stearate.
8. the powder metallurgically manufacturing method of nonmagnetic steel product according to claim 1-5, which is characterized in that described Nonmagnetic steel product is balance weight.
9. the nonmagnetic steel system that the powder metallurgically manufacturing method of the described in any item nonmagnetic steel products of claim 1-8 manufactures Product.
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CN107034420B (en) * 2017-06-21 2018-10-23 广东粤海华金科技股份有限公司 Nonmagnetic steel product and its manufacturing method
CN108677098A (en) * 2018-04-16 2018-10-19 华南理工大学 A kind of low nickel and high manganese austenitic nonmagnetic steel and preparation method thereof
CN108580911B (en) * 2018-05-02 2021-04-20 山东鲁银新材料科技有限公司 Preparation method of high-manganese non-magnetic steel powder
CN111468711A (en) * 2019-01-23 2020-07-31 广东粤海华金科技股份有限公司 Composite activation sintered non-magnetic steel material and manufacturing method thereof
CN109811274A (en) * 2019-02-27 2019-05-28 江门市阳浩金属制品有限公司 A kind of nonmagnetic steel and preparation method thereof
CN110000389B (en) * 2019-03-14 2020-07-31 全亿大科技(佛山)有限公司 Method for preparing stainless steel

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