CN104451382B - Abrasion-resistant profile steel and abrasion-resistant cutting board - Google Patents
Abrasion-resistant profile steel and abrasion-resistant cutting board Download PDFInfo
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- CN104451382B CN104451382B CN201410683221.3A CN201410683221A CN104451382B CN 104451382 B CN104451382 B CN 104451382B CN 201410683221 A CN201410683221 A CN 201410683221A CN 104451382 B CN104451382 B CN 104451382B
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- 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
- 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
- C21D1/06—Surface hardening
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to an abrasion-resistant profile steel and discloses the abrasion-resistant profile steel, which comprises the following chemical components in percentage by weight: 0.15%-0.30% of C, 0.10%-0.40% of Si, 1.00%-2.00% Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.04%-0.10% of Ti, and 0.0005%-0.00550% of B. After cutting and discharging, and heat treatment is directly performed, an abrasion-resistant cutting board has a tempered martensite hardening layer with the thickness larger than or equal to 10 mm on the surface, and is (40-50) HRC in surface hardness. The hardness gradient of the section is less than or equal to 1 HRC/mm in the hardening layer. The abrasion-resistant profile steel has a surface abrasion-resistant layer and excellent toughness at the central part, so that high surface resistance and impact load resistance are obtained. Meanwhile, the utilization ratio of the material is high, so that the abrasion-resistant cutting board is good in economical efficiency.
Description
Technical field
The present invention relates to a kind of high-abrasive material, more particularly to a kind of wear-resisting shaped steel and resistance to knifeboard.
Background technology
Scraper bowl knife plate is the strength member in engineering machinery equipment, work under bad environment, and in the course of the work Jing is normal
There is strong friction and impact with material.Resistance to knifeboard is arranged on scraper bowl, one on resistance to knifeboard by Type of Welding
As also to install bucket tooth, quick change knife plate etc. opposing high-wearing part.Therefore, resistance to knifeboard is except needing to have good weldering
Connect outside performance, in addition it is also necessary to enough hardness and wearability, in addition it is also necessary to there is higher toughness, prevent knife plate from rupturing and deforming.
In prior art, the production and processing technology of resistance to knifeboard mainly has：
After smelting and being rolled into sheet material, steel mill directly makes up to higher intensity and hard to steel to sheet material heat treatment
Degree, user's buying steel plate is processed into the part of required size；
After smelting and being rolled into sheet material, the sheet material for buying hot-rolled state by user is processed into required size to steel
Carry out being heat-treated the intensity and hardness needed for obtaining after part.
, there are many formulas both at home and abroad in the alloying aspect of resistance to knifeboard, according to resource situation, it is external mainly with chromium, molybdenum,
The alloying elements such as boron carry out alloying；The country mainly carries out alloying with chromium, manganese, silicon etc..
The alloy wear-resisting knife plate being heat-treated after casting, negligible amounts.
It is with the subject matter that the resistance to knifeboard of prior art manufacture is present：
1st, in the way of high intensity hardness steel plate is processed into part, its subject matter is that material hardness is high, following process compared with
It is difficult；The heat affected area of steel plate cutting process can reduce the mechanical property of material, and the knife plate deformation of excision forming is larger, follow-up to add
The more difficult control of working medium amount；
2nd, blade is reprocessed into required size with plate cutting, working (machining) efficiency is low, and stock utilization is low；
3rd, resistance to knifeboard formula is unreasonable, and relatively costly, cost performance is relatively low；
4th, resistance to knifeboard alloying overemphasizes high rigidity and whole cross section is hardened, and makes material welding performance poor, lacks
Obdurability is matched.
The content of the invention
It is an object of the invention to and provide a kind of wear-resisting shaped steel and resistance to knifeboard.
The present invention is such for the technical scheme for realizing its purpose：A kind of wear-resisting shaped steel is provided, its chemical analysis scope
It is by weight percentage：C：0.15 %~0.30 %, Si：0.10 %~0.40 %, Mn：1.00 %~2.00 %, P：≤
0.020 %, S：≤ 0.015 %, Ti：0.04 %~0.10 %, B：0.0005 %~0.00550 %, remaining is Fe and can not keep away
The impurity exempted from.Wherein Design of Chemical Composition main points are as follows（Following content is weight percent content）：
Carbon：Conclusive effect is played to the performance of steel, for the wear-resisting steel plate for having welding performance to require, appropriate carbon content
The requirement of knife plate welding performance can be met, can ensure that knife plate case hardness is required and rational center toughness requirement again.The present invention
Carbon content control is between 0.15 %~0.30 %.
Silicon：It is main with solid solution thereof presence in iron and steel, can drop with stronger solid solution strengthening effect, but too high silicon
The toughness of low steel, therefore silicone content of the present invention control is between 0.10 %~0.40 %.
Manganese：It is the element with solution strengthening effect the most frequently used in ordinary low-alloy steel.Manganese and sulphur can be formed fusing point compared with
High MnS, can prevent the caused hot-short phenomenon because of FeS, manganese from increase can also the hardness of iron and steel and intensity, but with manganese content
Further increase, the toughness of steel is gradually lowered, and has the tendency of grain coarsening, and be easily caused in strand and segregation occur and split
Line, reduces plate property, and accordingly manganese content of the present invention is controlled between 1.00 %~2.00 %.
Phosphorus：Microsegregation can be formed in solidification of molten steel, and segregation, in crystal boundary, reduces the crisp of steel in subsequent high-temperature heating
Property, this steel grade regards phosphorus as harmful element, and content is controlled in 0.020 below %.
Sulphur：Harmful element is equally seen as, content is controlled in 0.015 below %.
Titanium：It is one of more active metallic element, it and nitrogen, oxygen, carbon have extremely strong affinity, and the affinity of sulphur
Also the affinity of iron and sulphur is better than, therefore it is a kind of good deoxidation getter, is the effective element for determining carbon and nitrogen, is added suitable
When titanium can change the quality of steel and improve mechanical performance, the non-oxidizability and heat resistance of heat resisting steel can be improved, and to the weldering of steel
Connect also favourable.The Ti content of the wear-resisting shaped steel of the present invention is controlled between 0.04 %~0.10 %.
Boron：It is the important element of the quenching degree for improving steel, adds trace B, the quenching degree of steel can be improved, so as to improve
The uniformity of part section performance.The scarcity metals such as nickel, chromium, vanadium, molybdenum, tungsten can be saved with boron, China nickel, chromium resource can be made up
Deficiency, the Boron contents of wear-resisting shaped steel of the invention are controlled between 0.0005 %~0.00550 %.
The preferred chemical analysis scope of above-mentioned wear-resisting shaped steel is by weight percentage：C：0.17 %~0.25 %, Si：0.15
%~0.35 %, Mn：1.20 %~1.50 %, P：≤ 0.020 %, S：≤ 0.015 %, Ti：0.04 %~0.08 %, B：
0.0005 %~0.0040 %, remaining is Fe and inevitable impurity；Steel carbon equivalent ce V（%）≤ 0.52, wherein carbon equivalent is pressed
Weight calculates formula：CEV (%)=C (%)+Mn (%)/6+ (Cr (%)+Mo (%)+V (%))/5+ (Cu (%)
+ Ni (%))/15.In above formula, what the symbol of element+(%) was represented is the weight percent content of the element in the wear-resisting shaped steel.Press
The end quenching test method of the steel hardenabilities of GB/T 225 detects its through hardening sexual satisfaction J9 >=38 HRC, J20≤36 HRC.
The present invention is such for the technical scheme for realizing its purpose：A kind of resistance to knifeboard is provided, by foregoing wear shaped steel
Make, wear-resisting shaped steel obtains continuous casting billet by electric arc furnace smelting+refining/vacuum outgas → continuous casting traditional preparation methods, according to reality
Border uses knife plate shape of cross section, designs and manufacture corresponding roll, and strand is rolled into into shaped steel.Type is utilized in the operation of rolling
Steel section it is uneven, in its cooling procedure tissue change uneven generation be conducive to subsequently weld bucket tooth processing reversible deformation
Camber.Every meter of mm of flexibility ＜ 5, per 3 meters of mm of flexibility ＜ 10, and it is curved to there is wave.Thickness tolerance is
± 0.5 mm, in the thickness difference of same section any two points measurement 50 % of thickness deviation are not more than, and thickness direction rolling ratio is extremely
4 should be reached less：1.By the actually used multiple length for needing length（Or scale）Delivery, only needs to be cut according to knife plate length during production
Blanking just can directly carry out heat treatment process, and stock utilization improves 10%~15 %.Reduce the blanking time and cancel knife plate shaping
Manufacturing procedure, improve production efficiency reduces production cost.Eventually form knife plate embryo of the thickness range between 25 mm~45 mm
Body is heat-treated, plate heat treatment method with require：
Technology for Heating Processing is required：It is heated beyond AC3 and quickly cools down, is tempered immediately after；
Quench heating：Whole cross section uniform austenitic is made, coarse grains phenomenon is not produced, protective atmosphere is added, is prevented
Skin decarburization；
Quenching cooling：There are enough cooling velocities to guarantee to obtain martensitic structure, the type of cooling is quenched using high-pressure injection
Liquid is cooled down；
Tempering：It is tempered immediately after quenching, temperature >=180 DEG C, the h of temperature retention time ＞ 2.
After heat treatment there is the martensitic hardening layer of thickness >=10 mm on the surface of resistance to knifeboard.Case hardness is 40
HRC~50HRC, hardness >=35 HRC at the mm of surface 10.The section hardness gradient of resistance to knifeboard is per in effective hardness layer
Every 1 mm hardness ,≤1 HRC drops.It is reheated to original temperature and is incubated at least 1 hour, on surface or section same position
The hardness put reduces being not more than 3 HRC units；Effective hardness layer metallographic structure is lath martensite.
Resistance to knifeboard mechanical property desired value is shown in Table 1.
The resistance to knifeboard mechanical property desired value of table 1 and organizational requirements
The shaped steel of resistance to knifeboard of the present invention, its chemical analysis scope is by weight percentage：C：0.15 %~0.30 %,
Si：0.10 %~0.40 %, Mn：1.00 %~2.00 %, P：≤ 0.020 %, S：≤ 0.015 %, Ti：0.04 %~0.10
%, B：0.0005 %~0.00550 %, remaining is Fe and inevitable impurity.
The present invention compared with prior art, advantages of the present invention：
1. optimize material composition formula, make material cost reduce by 15 % or so, improve the economy of resistance to knifeboard.
2. make resistance to knifeboard that there is rational hardened layer gradient and metallographic structure after being heat-treated by controlling alloy quenching degree,
Guarantee that the resistance to knifeboard under abrasion, impact service condition has good surface abrasion resistance and knife plate entirety obdurability knot
Close, not only obtained good wearability but also prevented from being ftractureed using process.
3. resistance to knifeboard structure design of the invention can 20 % more thinning than common material knife plate thickness or so, and service life
For 2~3 times of common material knife plate, make equipment lightweight, improve the reliability of each system of whole machine, reduce whole engine oil consumption and
Improve operating efficiency.
Description of the drawings
Fig. 1 is the engineering machinery structural representation of resistance to knifeboard；
Fig. 2 is resistance to knifeboard section hardened layer schematic diagram；
Fig. 3 is wear-resisting type steel hardenability curve and characterisitic parameter table；
Fig. 4 is resistance to knifeboard section hardened case distribution curve in embodiment one；
Fig. 5 is resistance to knifeboard section hardened case distribution curve in embodiment two；
Fig. 6 is resistance to knifeboard section hardened case distribution curve in embodiment three.
In figure：Knife plate 1, knife plate cementation zone 11, knife plate core 12.
Specific embodiment
Specific embodiment is illustrated below in conjunction with the accompanying drawings.
Embodiment one
Wear-resisting shaped steel obtains continuous casting billet, root by electric arc furnace smelting+refining/vacuum outgas → continuous casting traditional preparation methods
According to actually used knife plate shape of cross section, corresponding roll is designed and manufactured, strand is rolled into into shaped steel.The profit in the operation of rolling
It is uneven with shaped steel section, in its cooling procedure the uneven generation of tissue change be conducive to subsequently weld bucket tooth processing contravariant
The camber of shape.Every meter of mm of flexibility ＜ 5, per 3 meters of mm of flexibility ＜ 10, and it is curved to there is wave.Thickness allows inclined
Difference is ± 0.5 mm, and in the thickness difference of same section any two points measurement 50 % of thickness deviation, thickness direction rolling are not more than
Than should at least reach 4：1.The component of wherein wear-resisting shaped steel is as follows：
Include following chemical composition by weight percentage：0.23 % C, 0.34 % Si, 1.53 % Mn, 0.018 % P,
0.005 % S, 0.0007 % B, 0.044 %Ti, remaining is Fe and inevitable impurity.
Carbon equivalent ce V（%）=0.485
Its through hardening sexual satisfaction J9=40 HRC, J20=are detected by the end quenching test method of the steel hardenabilities of GB/T 225
20.5 HRC。
By the actually used multiple length for needing length（Or scale）Delivery, only needs according to knife plate length cutting stock during production
Heat treatment process is directly carried out, wherein the thickness of resistance to knifeboard is 40 mm.Heat treatment method and requirement：
Technology for Heating Processing is required：It is heated beyond AC3 and quickly cools down, is tempered immediately after；
Quench heating：Whole cross section uniform austenitic is made, coarse grains phenomenon is not produced, protective atmosphere is added, is prevented
Skin decarburization；
Quenching cooling：There are enough cooling velocities to guarantee to obtain martensitic structure, the type of cooling is quenched using high-pressure injection
Liquid is cooled down；
Tempering：It is tempered immediately after quenching, temperature >=180 DEG C, the h of temperature retention time ＞ 2.
The resistance to knifeboard surface for after heat treatment forming engineering machinery has the martensitic hardening layer of thickness >=10 mm.
Case hardness is 40 HRC~50HRC, hardness >=35 HRC at the mm of surface 10.The section hardness gradient of resistance to knifeboard is having
≤ 1 HRC drops at interval of 1 mm hardness in effect hardened layer.It is reheated to original temperature and is incubated at least 1 hour, surface
Or the hardness of same position reduces being not more than 3 HRC units on section；Effective hardness layer metallographic structure is lath martensite.
Using GBT 228.1-2010 " metal material stretching test part 1s：Room temperature test method ", GB/T 229-
2007 " metal material Charpy pendulum impact test methods " detect to the mechanical property of resistance to knifeboard, the results are shown in Table 2.
The wear-resisting type steel making engineering machinery mechanics properties testing of the resistance to knifeboard result of table 2
Its section hardness distribution of resistance to knifeboard is as shown in Figure 4 in the present embodiment.
Embodiment two
Compared with embodiment one, in the present embodiment unlike the thickness of resistance to knifeboard be 32 mm, the material group of resistance to knifeboard
Divide and include by weight percentage following chemical composition：0.22 % C, 0.28 % Si, 1.41 % Mn, 0.017 % P, 0.011 %
S, 0.0026 % B, 0.06 %Ti, remaining is Fe and inevitable impurity.
Carbon equivalent ce V（%）=0.455
Its through hardening sexual satisfaction J9=44 HRC, J20=23 are detected by the end quenching test method of the steel hardenabilities of GB/T 225
HRC。
Using GBT 228.1-2010 " metal material stretching test part 1s：Room temperature test method ", GB/T 229-
2007 " metal material Charpy pendulum impact test methods " detect to the mechanical property of resistance to knifeboard, the results are shown in Table 3：
The wear-resisting type steel making engineering machinery mechanics properties testing of the resistance to knifeboard result of table 3
Its section hardness distribution of resistance to knifeboard is as shown in Figure 5 in the present embodiment.
Embodiment three
Compared with embodiment one, in the present embodiment unlike the thickness of resistance to knifeboard be 32 mm, the material group of resistance to knifeboard
Divide and include by weight percentage following chemical composition：0.19 % C, 0.19 % Si, 1.47 % Mn, 0.014 % P, 0.003 %
S, 0.0023 % B, 0.05 %Ti, remaining is Fe and inevitable impurity.
Carbon equivalent ce V（%）=0.435
Its through hardening sexual satisfaction J9=42 HRC, J20=20 are detected by the end quenching test method of the steel hardenabilities of GB/T 225
HRC。
Using GBT 228.1-2010 " metal material stretching test part 1s：Room temperature test method ", GB/T 229-
2007 " metal material Charpy pendulum impact test methods " detect to the mechanical property of resistance to knifeboard, the results are shown in Table 4：
The wear-resisting type steel making engineering machinery mechanics properties testing of the resistance to knifeboard result of table 4
Its section hardness distribution of resistance to knifeboard is as shown in Figure 6 in the present embodiment.
Inspection shows that this wear-resisting shaped steel disclosure satisfy that the use requirement of the resistance to knifeboard of engineering machinery.
Claims (8)
1. a kind of wear-resisting shaped steel, for making wear-resisting type knife plate, it is characterised in that its chemical analysis scope is by weight percentage
For：C：0.15%~0.30%, Si：0.10%~0.40%, Mn：1.00%~2.00%, P：≤ 0.020%, S：≤
0.015%, Ti：0.04%~0.10%, B：0.0005%~0.00550%, remaining is Fe and inevitable impurity, is pressed
The end quenching test method of the steel hardenabilities of GB/T 225 detects its through hardening sexual satisfaction J9 >=38HRC, J20≤36HRC.
2. wear-resisting shaped steel according to claim 1, it is characterised in that its chemical analysis scope is by weight percentage：C：
0.17%~0.25%, Si：0.15%~0.35%, Mn：1.20%~1.50%, P：≤ 0.020%, S：≤ 0.015%,
Ti：0.04%~0.08%, B：0.0005%~0.0040%, remaining is Fe and inevitable impurity.
3. wear-resisting shaped steel according to claim 1, it is characterised in that steel carbon equivalent ce V (%)≤0.52, wherein carbon equivalent
Weight percentage calculates formula：CEV (%)=C (%)+Mn (%)/6+ (Cr (%)+Mo (%)+V (%))/5+ (Cu
(%)+Ni (%))/15.
4. a kind of resistance to knifeboard, it is characterised in that the wear-resisting type steel by any one of aforementioned claims 1 to 3 is made, its
Surface has the martensitic hardening layer of thickness >=10mm.
5. resistance to knifeboard according to claim 4, it is characterised in that its case hardness is 40HRC~50HRC, away from surface
Hardness >=35HRC at 10mm.
6. resistance to knifeboard according to claim 4, it is characterised in that the section hardness gradient of resistance to knifeboard is effectively being hardened
At interval of 1mm hardness drop≤1HRC in layer.
7. resistance to knifeboard according to claim 4, it is characterised in that the effective hardness layer of resistance to knifeboard metallographic structure is lath
Martensite.
8. resistance to knifeboard according to claim 4, it is characterised in that the resistance to knifeboard is reheated to resistance to knifeboard and exists
Temperature in manufacture process is simultaneously incubated at least 1 hour, and the hardness of same position reduces being not more than 3 on surface or section
HRC units.
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| CN201410683221.3A CN104451382B (en) | 2014-11-24 | 2014-11-24 | Abrasion-resistant profile steel and abrasion-resistant cutting board |
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| CN104451382B true CN104451382B (en) | 2017-05-17 |
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| CN113718158A (en) * | 2021-08-30 | 2021-11-30 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for high-strength saw blade of mine |
| CN113684421B (en) * | 2021-08-30 | 2022-06-28 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for ultra-wide disk saw blade of mine |
| CN117363989A (en) * | 2023-09-22 | 2024-01-09 | 包头钢铁（集团）有限责任公司 | Low-cost high-toughness HB 400-grade wear-resistant steel plate for mining truck bottom plate and production method thereof |
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|---|---|---|---|---|
| JPH11264016A (en) * | 1998-03-18 | 1999-09-28 | Thk Co Ltd | Method for heat treating stainless steel and heat resistance stainless steel |
| JP2004115840A (en) * | 2002-09-25 | 2004-04-15 | Daido Steel Co Ltd | Ferritic heat-resistant cast steel part with excellent thermal fatigue resistance, and manufacturing method |
| WO2004106574A1 (en) * | 2003-05-27 | 2004-12-09 | Koyo Seiko Co., Ltd. | Steel bar for steering rack, method for producing the same, and steering rack using the same |
| JP4197459B2 (en) * | 2003-05-27 | 2008-12-17 | 株式会社ジェイテクト | Steel bar for steering rack |
| CN102321841A (en) * | 2011-10-08 | 2012-01-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Track shoe steel with tensile strength of up to 1300 MPa and manufacturing method thereof |
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2014
- 2014-11-24 CN CN201410683221.3A patent/CN104451382B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264016A (en) * | 1998-03-18 | 1999-09-28 | Thk Co Ltd | Method for heat treating stainless steel and heat resistance stainless steel |
| JP2004115840A (en) * | 2002-09-25 | 2004-04-15 | Daido Steel Co Ltd | Ferritic heat-resistant cast steel part with excellent thermal fatigue resistance, and manufacturing method |
| WO2004106574A1 (en) * | 2003-05-27 | 2004-12-09 | Koyo Seiko Co., Ltd. | Steel bar for steering rack, method for producing the same, and steering rack using the same |
| JP4197459B2 (en) * | 2003-05-27 | 2008-12-17 | 株式会社ジェイテクト | Steel bar for steering rack |
| CN102321841A (en) * | 2011-10-08 | 2012-01-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Track shoe steel with tensile strength of up to 1300 MPa and manufacturing method thereof |
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