CN1203959A - Case hardening steel - Google Patents
Case hardening steel Download PDFInfo
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- CN1203959A CN1203959A CN 98108743 CN98108743A CN1203959A CN 1203959 A CN1203959 A CN 1203959A CN 98108743 CN98108743 CN 98108743 CN 98108743 A CN98108743 A CN 98108743A CN 1203959 A CN1203959 A CN 1203959A
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- case hardening
- hardening steel
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Abstract
A case hardening steel with a minimum of grain boundary oxidation, suitable for use in the manufacture of mechanical elements with high demands on fatigue resistance and wear resistance, comprising, in % by weight:C0.12-0.25, Si<=0.30,Mn0.30-0.80, Cr0.30-0.80, Ni0.20-0.80, Mo0.10-0.50, Ti0.020-0.080, Al0.005-0.10, B0.001-0.006, the remainder Fe and impurities.
Description
The present invention relates to the case hardening steel of grain boundary oxidation minimum, it is applicable to the mechanical component that manufacturing has higher requirements to fatigue resistance and wear resistance.
For example in the geartransmission process, rotatable parts are subjected to very big stress.In order to obtain the material of higher-strength, steel has carried out alloying.Have been found that Si, Mn and Cr in the alloying element are harmful to grain boundary oxidation, because these elements increase the degree of depth of oxidation.For improving the alloying effect, can directly increase content such as the Ni and the Mo of some material, but they cost an arm and a leg.
One of purpose of the present invention is by reducing inner grain boundary oxidation, to compare improved purpose with conventional steel to reach the internal oxidation characteristic that makes case hardening steel.
Another object of the present invention is the demand that reduces as the noble alloy element of Ni, Mo and so on, still can obtain the very low oxidation depth value of comparing with conventional steel.
Reached this purpose with steel of the present invention, its composition is as follows, (% weight):
C?????0．12-0．25
Si????????≤0．30
Mn????0．30-0．80
Cr????0．30-0．80
Ni????0．20-0．80
Mo????0．10-0．50
Ti????0．020-0．080
Al????0．005-0．10
B?????0．001-0．006
Surplus is Fe and impurity.
According to the preferred embodiments of the invention, the composition of this steel is as follows, (% weight):
C?????0．15-0．22
Si?????????≤0．15
Mn????0．40-0．70
Cr????0．40-0．70
Ni????0．30-0．60
Mo????0．25-0．40
Ti????0．030-0．070
Al????0．03-0．06
B?????0．002-0．004
Surplus is Fe and impurity.
Fig. 1 represents the grain boundary oxidation of two kinds of known steel and steel of the present invention.
Fig. 2 represents the oxidation depth of steel 20MnCr5 and the relation of carburized depth.
Fig. 3 represents the oxidation depth of steel of the present invention and the relation of carburized depth.
Be not to adopt high-load expensive alloy element Ni and the Mo that benefits internal oxidation, ladle of the present invention has contained the B of lower concentration.And, the deleterious alloying element Si of internal oxidation, Mn and Cr are remained on the low levels level.Steel of the present invention has the grain boundary oxidation (internal oxidation) of extraordinary hardening capacity and minimum degree.
Internal oxidation is harmful to fatigue property, and this is because the crystal boundary that has weakened, bad tissue, the reduction of surface hardness, disadvantageous stress.
Below by comparison, the present invention has been carried out detailed explanation to the anti-internal oxidation ability of conventional steel and steel of the present invention.
Table 1 has been listed the composition of two kinds of conventional steel and steel of the present invention, represents with weight percent:
Table 1
| Material | C | Mn | Cr | Ni | Al | Ti | B |
| 20NiCrMo6-4 | 0.19 | 0.58 | 0.79 | 1.65 | 0.036 | 0.001 | - |
| 20MnCr5 | 0.18 | 1.28 | 1.13 | 0.10 | 0.036 | 0.001 | - |
| Steel of the present invention | 0.22 | 0.55 | 0.54 | 0.49 | 0.029 | 0.042 | 0.003 |
Table 2 expression is included in the Hardening Of Steel ability in the table 1.
Table 2
| Material | The J5 value | The J10 value |
| 20NiCrMo6-4 | 44 | 40 |
| 20MnCr5 | 41 | 33 |
| Steel of the present invention | 45 | 43 |
The grain boundary oxidation of having showed the surface cementation sample of material in the table 1 among Fig. 1.This figure has clearly illustrated the improvement that obtains with material of the present invention.Carburizing time is 8 hours 30 minutes.
Fig. 2 represents the internal oxidation degree of depth of reference material 20MnCr5 and the relation of the surface cementation degree of depth.Fig. 3 is the corresponding relation figure of material of the present invention.Can find out significantly that from the result who discloses the oxidation depth of reference material is in the order of magnitude of 0.010mm, depth of material of the present invention is in the 0.003mm or the littler order of magnitude simultaneously.
Claims (1)
1. case hardening steel with minimum grain boundary oxidation, it is applicable to that manufacturing to the mechanical component that fatigue resistance and wear resistance have higher requirements, has following composition (% weight):
C?????0．12-0．25
Si????????≤0．30
Mn????0．30-0．80
Cr????0．30-0．80
Ni????0．20-0．80
Mo????0．10-0．50
Ti????0．020-0．080
Al????0．005-0．10
B?????0．001-0．006
Surplus is Fe and impurity.
2. according to the steel of claim 1, have following composition (% weight):
C?????0．15-0．22
Si????????≤0．15
Mn????0．40-0．70
Cr????0．40-0．70
Ni????0．30-0．60
Mo????0．25-0．40
Ti????0．030-0．070
Al????0．03-0．06
B?????0．002-0．004
Surplus is Fe and impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98108743 CN1203959A (en) | 1997-04-29 | 1998-04-29 | Case hardening steel |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE97015945 | 1997-04-29 | ||
| CN 98108743 CN1203959A (en) | 1997-04-29 | 1998-04-29 | Case hardening steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1203959A true CN1203959A (en) | 1999-01-06 |
Family
ID=5219774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98108743 Pending CN1203959A (en) | 1997-04-29 | 1998-04-29 | Case hardening steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1203959A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463997C (en) * | 2007-05-30 | 2009-02-25 | 太原理工大学 | Supersaturated carburizing steel |
| CN100586632C (en) * | 2004-05-21 | 2010-02-03 | 特诺颜料有限公司 | Particle bed roller mill |
| CN105814230A (en) * | 2013-12-12 | 2016-07-27 | 丰田自动车株式会社 | Method of manufacturing ferrous metal component |
-
1998
- 1998-04-29 CN CN 98108743 patent/CN1203959A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100586632C (en) * | 2004-05-21 | 2010-02-03 | 特诺颜料有限公司 | Particle bed roller mill |
| CN100463997C (en) * | 2007-05-30 | 2009-02-25 | 太原理工大学 | Supersaturated carburizing steel |
| CN105814230A (en) * | 2013-12-12 | 2016-07-27 | 丰田自动车株式会社 | Method of manufacturing ferrous metal component |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |