CN106119729A - A kind of hot investment casting bearing steel - Google Patents
A kind of hot investment casting bearing steel Download PDFInfo
- Publication number
- CN106119729A CN106119729A CN201610679406.6A CN201610679406A CN106119729A CN 106119729 A CN106119729 A CN 106119729A CN 201610679406 A CN201610679406 A CN 201610679406A CN 106119729 A CN106119729 A CN 106119729A
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- CN
- China
- Prior art keywords
- bearing steel
- steel
- investment casting
- hot investment
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- C21D2211/008—Martensite
Abstract
The invention discloses a kind of hot investment casting bearing steel, it is to comprise the following components in percentage by weight: C:0.95 1.02%, Si:0.15 0.25%, Mn:0.55 0.75%, S:0.03 0.05%, Cr:14 17%, P:0.01 0.02%, Al:0.020 0.035%, N:0.30 0.40%, Mo:0.8 1.0%, surplus is Fe and inevitable impurity, its decay resistance of bearing steel of the prior art and the performance such as wear-resisting all can not meet use requirement, the present invention is by carbon, nitrogen, chromium, molybdenum rational proportion, material is made well to be provided with corrosion-proof wear heat resistance, good mechanical performance and fatigue strength.
Description
Technical field
The invention belongs to bearing steel field, be specifically related to a kind of hot investment casting bearing steel.
Background technology
Bearing is the device allowing to carry out between two parts constrained relative motion.It is widely used in Aeronautics and Astronautics, state
The fields such as anti-, heavy mechanical equipment, most important parts in various mechanical mechanisms.Bearing life is to pass judgment on bearing quality key
Index, current bearing commonly uses casting method molding, and precision casting is a kind of to exempt from processing or the least foundry goods of allowance
Product, prescription is higher.Bearing is connection member parts important in mechanical part.But, the bearing precision of prior art
There is following point in casting: the metallographic of product and hardness, intensity and elongation percentage all do not reach use requirement.
Along with present equipment manufacture industry develops, bearing is gradually by the research of the research steering material of precision, so the highest
End bearing research is basically the research of bearing material.Along with machinery manufacturing industry, particularly automobile, aviation, atomic energy industry
Deng develop rapidly, the performance requirement of bearing is improved constantly, if desired for high temperature, at a high speed, under high load capacity, the harsh conditions such as anti-corrosion
The special bearing of work.For adapting to the demand of these bearings, various countries in succession develop and develop a collection of has the new of property
Steel grade, defines the bearing materials such as high-carbon-chromium bearing steel, carburizing bearing steel, stainless bearing steel, high-temperature bearing steel.
Roll shaft parts to contract containing interior raceway and outer raceway and the rolling part being disposed there between in a large number.Different zero
Part, to rolling contact fatigue, abrasion and creep toleration, depends on required product made from steel application, and modern steel uses ferrum and alloy unit
Element various combinations and manufacture.Although common stainless bearing steel anticorrosion effect in air and weak corrosive medium is pretty good, and tool
There are good resistance to elevated temperatures and contact fatigue strength, but under some badly applying working condition, its decay resistance and wear-resisting
Performance all can not meet use requirement.
At present, the bearing material being on active service in a corrosive environment, the hardness of major part austenitic stainless steel is low, even if cold-working
Hardening, hardness is the highest, and producting process difficulty is big；Precipitation-hardening stainless steel, its hardness can not meet use, heat treatment very well
Complex process, this two classes steel can not meet the requirement of service condition under corrosive atmosphere.Partial martensite stainless bearing steel is stainless
Although steel has the feature that hardness is high, but phosphorus content is higher, and in tissue, eutectic carbide is formed more, and granule is thick, skewness
Even, major part is distributed on crystal boundary, and eutectic carbide peels off from finished surface, forms pit, affects surface quality and processing essence
Degree, and in use, form stress at eutectic carbide and concentrate and produce fatigue crack.
Summary of the invention
Defect based on prior art, it is an object of the invention to provide and a kind of can improve the wear-resisting of bearing, corrosion-resistant, resistance to
High temperature, low cost, easily the rust-proofing hot investment casting bearing steel of processing.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of hot investment casting bearing steel, it is by following
The component composition of percentage by weight: C:0.95-1.02%, Si:0.15-0.25%, Mn:0.55-0.75%, S:0.035-0.05%,
Cr:14-17%, P:0.01-0.02%, Al:0.020-0.035%, N:0.30-0.40%, Mo:0.8-1.0%, surplus is Fe and not
Evitable impurity.
The most described hot investment casting bearing steel, it is to comprise the following components in percentage by weight: C:0.99%, Si:
0.20%, Mn:0.65%, S:0.04%, Cr:15%, P:0.015%, Al:0.025%, N:0.35%, Mo:0.9%, surplus be Fe and
Inevitably impurity.
Preferred described hot investment casting bearing steel is to sequentially pass through 910-1000 DEG C of quenching, 165 DEG C of tempering heat treatment, tempering
Tissue matrix is tempered martensite, Dispersed precipitate eutectic carbide on tempered martensite matrix.
The effect of its each component of the bearing steel of the present invention and the restriction reason of scope are as described below:
Carbon: the carbon content hardness to the parts of bearings after quenching, maintains the intensity under parts of bearings room temperature, high temperature, and improves
The necessary element of cold-workability.The relation that Carbon Solubility and chromium concn are inversely proportional to, inventor finds through overtesting: if carbon weight
Percentage ratio increases, then the carbon content in final composition is likely to reduced, when the carbon content in bearing steel is more than 0.95%,
Without introducing substantial amounts of carbon in steel by heat treatment, also can obtain the amount of enough hardness and carbide, when carbon content exceedes
When 1.02%, forming big carbide when the manufacture of steel, this carbide can have a strong impact on the rolling contact fatigue characteristic of parts of bearings
And mar proof.
Silicon: the element that silicon is useful with improving hardenability to the solution strengthening of base material, inventor finds through overtesting: work as bearing
The hold-up of the hydrogen in steel can be made when silicone content in steel is 0.15%-0.25% to increase and accelerate hydrogen embrittlement, and when in bearing steel
When silicone content is more than 0.25%, hydrogen is easily accessible in steel, is susceptible to the peeling caused by hydrogen embrittlement, and cold-workability significantly reduces.
Manganese: manganese is the solution strengthening to base material and improves the useful element of hardenability, before manganese is to the quenching degree of steel and quenching
The hardness of steel have contribution.Inventor finds through overtesting: when Fe content is 0.55%-0.75%, and the hardness of quenched materials is high,
When Fe content is more than 0.75%, cold-workability reduces.
Phosphorus: phosphorus is the element contained as inevitable impurity, and it is at cyrystal boundary segregation, makes cold-workability low, should use up
Amount reduces the content of phosphorus, but, too much reduction can cause steel cost processed to increase, and the phosphorus selected by the present invention is in the range of 0.01-
0.02%, the bearing steel combination property prepared is optimum.
Sulfur: sulfur is the element contained as inevitable impurity, it separates out at crystal boundary as FeS, is to make cold working
The element that property is low.It addition, the chemical bonding such as sulfur and manganese, forming the non-metallic inclusions such as such as Manganese monosulfide. and separate out, this is nonmetal
Field trash can have a strong impact on the life-span of bearing, makes rolling contact fatigue characteristic low, therefore, should reduce its content as far as possible, but, mistake
Many reductions can cause steel cost processed to increase, and the phosphorus selected by the present invention is in the range of 0.035-0.05%, and prepared bearing steel is comprehensive
Can be optimum.
Chromium: chromium is conventional alloying element, for against corrosion and rust-proofing.Chromium and carbon combine and form carbide, are that raising is wear-resisting
Damage property and the element of cold-workability, chromium is the element of easy segregation, and therefore, when chromium content is more than 17%, thick carbide is raw
Becoming, rolling contact fatigue characteristic is the lowest.
Aluminum: aluminum is effective as deoxidant element, reduces the oxygen amount in steel, has the effect improving rolling contact fatigue characteristic, improves
The element of rolling contact fatigue characteristic, control Al content is in the range of 0.020 0.035%, in the effect ensureing Al crystal grain thinning
While, be unlikely to have too much Al, form oxide, nitride reduces the performance of material.
Molybdenum: molybdenum gives the toughness of the bearing steel in heavy service, and provides heat-resisting alloy especially.Inventor is through examination
Issuing after examination and approval existing: when molybdenum content is 0.8-1.0%, molybdenum can combine other alloying elements, improves bearing steel mechanical performance such as hardness
Deng.
Nitrogen: nitrogen forms nitride non-metallic inclusion by being combined with aluminum, makes austenite crystal miniaturization, thus carries
High tenacity and rolling fatigue life characteristic, when high temperature, during steel processing, the nitrogen concentration in austenite depends on chromium, manganese and molybdenum
Concentration, therefore, it is difficult to introduce in compositions by more nitrogen, unless increased the content of these alloying elements.Inventor is through examination
Issue after examination and approval existing: when adding more than 0.4%, steel exists nitride field trash in large quantities, therefore causes rolling fatigue life
Characteristic reduces.It addition, there is the nitrogen not generated with nitride form in steel in large quantities, thus toughness is caused to reduce.
The present invention, by carbon, nitrogen, chromium, molybdenum rational proportion, makes material well be provided with corrosion-proof wear heat resistance, Reasonable
The carbon of ratio can guarantee that quench tempering hardness and the toughness of material, for increasing the hardness of the steel part formed, the nitrogen of rational proportion
Solid solution strength and the corrosion resisting property of steel can be improved, be simultaneously introduced appropriate chromium, molybdenum further increases the intensity of steel, hardness, anti-corrosion,
The physico mechanical characteristics such as heatproof, while ensureing cryogenic property, also ensure that good hardness and wearability, and good
Mechanical performance and fatigue strength；By to constituting the chromium that bearing steel interpolation is appropriate, it is possible to suppression fragility is peeled off, therefore, it is possible to real
The prolongation of existing bearing life, and it is capable of reducing the effect of cost；Stainless bearing steel of the present invention is through 910-
1000 DEG C of hardening heats, under the temperature of 165 DEG C, have stable Rockwell hardness, and meansigma methods maintains 60 HRC；This
Bright bearing steel also has excellent resistance to rolling characteristic, it is possible to meets the manufacture of the bearing steel of various functional requirement, thus brings
Industrially beneficial effect.And bearing steel structural homogenity is good, machining accuracy is high；Compared with other high alloy materials,
The cost of the bearing steel of the present invention is relatively low.
Detailed description of the invention
Being described in further details the present invention below by embodiment, embodiment is only used for the present invention is described, does not limit
The scope of the present invention processed.
Embodiment 1: a kind of hot investment casting bearing steel, it is to comprise the following components in percentage by weight: C:0.95%, Si:
0.15%, Mn:0.55%, S:0.035%, Cr:14%, P:0.01%, Al:0.020%, N:0.30%, Mo:0.8%, surplus be Fe and
Inevitably impurity, described hot investment casting bearing steel is to sequentially pass through 910 DEG C of quenchings, 165 DEG C of tempering heat treatment, tempered structure
Matrix is tempered martensite, Dispersed precipitate eutectic carbide on tempered martensite matrix.
Embodiment 2: a kind of hot investment casting bearing steel, it is to comprise the following components in percentage by weight: C:0.99%, Si:
0.20%, Mn:0.65%, S:0.04%, Cr:15%, P:0.015%, Al:0.025%, N:0.35%, Mo:0.9%, surplus be Fe and
Inevitably impurity, described hot investment casting bearing steel is to sequentially pass through 990 DEG C of quenchings, 165 DEG C of tempering heat treatment, tempered structure
Matrix is tempered martensite, Dispersed precipitate eutectic carbide on tempered martensite matrix.
Embodiment 3: a kind of hot investment casting bearing steel, it is to comprise the following components in percentage by weight: C:1.02%, Si:
0.25%, Mn:0.75%, S:0.05%, Cr:17%, P:0.02%, Al:0.035%, N:0.40%, Mo:1.0%, surplus is Fe and not
Evitable impurity, described hot investment casting bearing steel is to sequentially pass through 1000 DEG C of quenchings, 165 DEG C of tempering heat treatment, tempered structure
Matrix is tempered martensite, Dispersed precipitate eutectic carbide on tempered martensite matrix.
Embodiment 4: this embodiment is widely used conventional bearings steel 9Cr18 in prior art, and it is by following weight
The component composition of percentage ratio: C:0.9-1.0%, Si :≤0.8, Mn :≤0.8, S :≤0.030, Cr:17.00-19.00%, surplus
For Fe and inevitable impurity.
Table one is the contact fatigue life of each embodiment bearing steel, decay resistance result of the test:
Table one
The performance test results of the embodiment 1,2,3,4 from table one it can be seen that embodiment of the present invention 1,2,3 not
Rust Contact Fatigue Life of Bearing Steel is far above the 9Cr18 bearing steel of embodiment 4, and corrosion resistance is also superior to comparative example's 4
9Cr18 bearing steel.
Claims (3)
1. a hot investment casting bearing steel, it is characterised in that it is to comprise the following components in percentage by weight: C:0.95-
1.02%, Si:0.15-0.25%, Mn:0.55-0.75%, S:0.035-0.05%, Cr:14-17%, P:0.01-0.02%, Al:
0.020-0.035%, N:0.30-0.40%, Mo:0.8-1.0%, surplus is Fe and inevitable impurity.
Hot investment casting bearing steel the most according to claim 1, it is characterised in that it is by the group of following weight percents
It is grouped into: C:0.99%, Si:0.20%, Mn:0.65%, S:0.04%, Cr:15%, P:0.015%, Al:0.025%, N:0.35%,
Mo:0.9%, surplus is Fe and inevitable impurity.
The bearing steel of hot investment casting the most according to claim 1, it is characterised in that: described hot investment casting bearing steel is successively
Through 910-1000 DEG C of quenching, 165 DEG C of tempering heat treatment, tempered structure matrix is tempered martensite, on tempered martensite matrix
Dispersed precipitate eutectic carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679406.6A CN106119729A (en) | 2016-08-18 | 2016-08-18 | A kind of hot investment casting bearing steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679406.6A CN106119729A (en) | 2016-08-18 | 2016-08-18 | A kind of hot investment casting bearing steel |
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| CN106119729A true CN106119729A (en) | 2016-11-16 |
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| CN201610679406.6A Pending CN106119729A (en) | 2016-08-18 | 2016-08-18 | A kind of hot investment casting bearing steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109891A (en) * | 2022-07-14 | 2022-09-27 | 中北大学 | High-carbon high-chromium nitrogen-containing martensitic stainless steel and carbide refining method thereof |
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| JP2000226641A (en) * | 1999-02-05 | 2000-08-15 | Nsk Ltd | Rolling device |
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| CN101033527A (en) * | 2007-04-16 | 2007-09-12 | 大连伯新特钢制品有限公司 | High-chromium medium-carbon stainless steel and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109891A (en) * | 2022-07-14 | 2022-09-27 | 中北大学 | High-carbon high-chromium nitrogen-containing martensitic stainless steel and carbide refining method thereof |
| CN115109891B (en) * | 2022-07-14 | 2022-12-20 | 中北大学 | High-carbon high-chromium nitrogen-containing martensitic stainless steel and carbide refining method thereof |
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Application publication date: 20161116 |