CN106086636A - A kind of auto parts and components steel of antiwear heat resisting and preparation method thereof - Google Patents
A kind of auto parts and components steel of antiwear heat resisting and preparation method thereof Download PDFInfo
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- CN106086636A CN106086636A CN201610421024.3A CN201610421024A CN106086636A CN 106086636 A CN106086636 A CN 106086636A CN 201610421024 A CN201610421024 A CN 201610421024A CN 106086636 A CN106086636 A CN 106086636A
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
-
- 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
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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
- C22C38/06—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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
nullAuto parts and components steel that the invention discloses a kind of antiwear heat resisting and preparation method thereof，Relate to auto parts machinery raw material field，It is prepared from including by the raw material of following percentage by weight: carbon 0.18 0.22%、Silicon 0.05 0.44%、Manganese 1 1.5%、Phosphorus ＜ 0.01%、Sulfur ＜ 0.002%、Aluminum 0.02 0.07%、Titanium 0.001 0.01%、Nickel 0.001 0.15%、Molybdenum 0.01 0.1%、Calcium silicide 0.0001 0.03%、Niobium 0.001 0.01%、Zirconium 0.001 0.01%，Surplus is ferrum and inevitable impurity，Wherein，Gas content in steel is: [N]=200 280ppm，[H]≤2ppm，[O]=20 50ppm，Processing preparation process includes the making of alloy block、Casting、Forging and heat treatment three step，The Steel material formula of the present invention is reasonable，Use low-carbon (LC) principle，Nickel is added in formula、Titanium、Niobium and zircaloy steel element，Steel material is made to have preferable comprehensive mechanical property，Especially there is intensity and hardness is high、Wearability is good，Also retains the toughness that low-carbon (LC) is own，Suitably preparation method can improve the toughness of ultra high strength alloy steel forging，Reduce the decline degree of ultra high strength alloy steel forging fatigue strength/tensile strength ratio.
Description
Technical field
The present invention relates to auto parts machinery raw material field, be specifically related to a kind of antiwear heat resisting auto parts and components steel and
Its preparation method.
Background technology
The metal kit of automobile, not only structural strength with functionally have higher requirement, simultaneously in machining
Upper no less important, such requirement is not only and is met the primary condition that automobile uses, and is also that safe and reliable prolongation uses simultaneously
The guarantee in life-span.In prior art, the steel producing auto parts machinery are common middle low content steel alloy, because of these automobile metals
Accessory is using functionally moving component the most frequently, and wear rate is the highest, changes frequently, adds maintenance cost；Find
Strong to a kind of combination property, i.e. hardness and anti-wear performance is excellent, the alloy of the middle low content that piece surface heat resistance is high simultaneously
Steel just seems extremely important.
Summary of the invention
Problem to be solved by this invention is to provide the strong auto parts and components steel of a kind of combination property and preparation side thereof
Method.
To achieve these goals, the technical scheme that the present invention takes is:
The auto parts and components steel of a kind of antiwear heat resisting, are prepared from including by the raw material of following percentage by weight: carbon
0.18-0.22%, silicon 0.05-0.44%, manganese 1-1.5%, phosphorus ＜ 0.01%, sulfur ＜ 0.002%, aluminum 0.02-0.07%, titanium
0.001-0.01%, nickel 0.001-0.15%, molybdenum 0.01-0.1%, calcium silicide 0.0001-0.03%, niobium 0.001-0.01%,
Zirconium 0.001-0.01%, surplus is ferrum and inevitable impurity, and wherein, the gas content in steel is: [N]=200-
280ppm, [H]≤2ppm, [O]=20-50ppm.
Preferably, the percentage by weight of described raw material is carbon 0.2%, silicon 0.35%, manganese 1%, phosphorus 0.008%, sulfur
0.001%, aluminum 0.04%, titanium 0.006%, nickel 0.009%, molybdenum 0.07%, calcium silicide 0.003%, niobium 0.01%, zirconium
0.001%, surplus is ferrum and inevitable impurity, and wherein, the gas content in steel is: [N]=230ppm, [H]=
1ppm, [O]=35ppm.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting, comprises the following steps:
(1) making of alloy block: after the pig iron is broken into little granule, puts in vaccum sensitive stove and melts, add steel scrap,
Originate as ferrous substrate；Add calcium silicide and carry out desulfurization, deoxidation；Then carry out respectively being broken into little granule by carbon, the silicon of 1/2,
Being then placed in ball mill, under being passed through noble gas state, ball milling 20-40min, obtains composite powder；In vacuum induction furnace
Put into composite powder, be heated to melting completely, fusion process uses refining agent refine, casts, cast after-baking etc., make after cooling
Become steel billet；
(2) casting: put into by the steel billet of step (1) and be melted to molten condition in electric arc furnace, is incubated 0.5-1h, then to it
The carbon of middle addition surplus and silicon alloy element, stir, and is incubated 20-30min, then is added thereto to other residue composition conjunction
Gold element, stirs, and samples after 1530-1620 DEG C of refine 60-75min, insulation 25-35min, after analysis ingredient,
Adjusting component, melts 15-20min, and casting, tapping temperature is 1250-1520 DEG C；
(3) forging and heat treatment: forge the profiled member in step (2), the profiled member after forging by foundry goods liter
Temperature carries out normalizing to 950 DEG C-980 DEG C, sends in the chamber type electric resistance furnace of full nitrogen and be heated to 850 DEG C after normalized treatment,
Insulation 0.5-1h, then takes out air cooling by foundry goods, continues to be fed in chamber type electric resistance furnace and is tempered, be heated to after being cooled to room temperature
450-550 DEG C is incubated 90 minutes, takes out and naturally cools to room temperature and get final product.
Preferably, the forging condition in described step (3): open forging temperature >=1250 DEG C, final forging temperature >=800 DEG C, forging
Deflection >=35%.
Preferably, the noble gas that described step (1) uses is argon.
The beneficial effects of the present invention is: the Steel material formula of the present invention is reasonable, use low-carbon (LC) principle, add in formula
Nickel, titanium, niobium and zircaloy steel element so that Steel material has preferable comprehensive mechanical property, especially have intensity and hardness high,
Wearability is good, also retains the toughness that low-carbon (LC) is own, and wherein carbon acts primarily as solution strengthening effect in steel, improves the hardness of steel
And hardenability, carbon content is too low, and after heat treatment hardness is the lowest, and steel is too soft.Carbon content is too high, and steel hardness is the highest, processing
The problems such as process is the most cracking, processing characteristics is poor.Silicon plays solution strengthening effect in steel, and content is too low, invigoration effect
The least；Too high levels, easily forms Fe at product surface2SiO4, cause surface defect.Manganese plays solution strengthening effect in steel, carries
The hardness of high steel and quenching degree, content is too low, and invigoration effect is the least；Too high levels easily causes in slab in casting process
Heart segregation, reduces the serviceability of material.P and s is the impurity element in steel, it is easy at Grain Boundary Segregation, affect the tough of product
Property, therefore its content is the lowest more good, reduces the toughness of steel, should fully remove during steel-making.Aluminum is combined with oxygen in steel, acts primarily as
To the effect of deoxidation, but too high levels easily forms continuous casting and produces difficulty.
In preparation method, the present invention first makes alloy block and passes through to melt and add alloying element to make foundry goods, to reach again
To the toughness of raising ultra high strength alloy steel forging, reduce ultra high strength alloy steel forging fatigue strength/tensile strength ratio
Decline degree, simultaneously compared with conventional industrial method method, has added a step normalized treatment in Technology for Heating Processing so that combine
Conjunction mechanical performance is obviously improved, but does not improve too much integrated cost, is fully able to meet auto parts machinery alloy steel material
Use requirement, wherein, by adding calcium silicide as deoxidizer in the preparation technology of cast steel, it is possible to quickly react with molten steel,
There is good deoxidation, desulfurization, the effect of carburetting, fluidity molten steel can be improved simultaneously, effectively remove inclusion content in melting steel, improve
Molten Steel Cleanliness, by ball milling can crystal grain thinning, improve the form of field trash, make carbon and silicon form the carbon of small and dispersed with ferrum
Compound, is uniformly distributed in matrix, the high intensity that obtains, high abrasion, the cast steel material of length in service life.
Detailed description of the invention
Embodiment 1: the auto parts and components steel of a kind of antiwear heat resisting, prepares including by the raw material of following percentage by weight
Form: carbon 0.22%, silicon 0.05%, manganese 1.5%, phosphorus 0.009%, sulfur 0.0004%, aluminum 0.07%, titanium 0.001%, nickel
0.15%, molybdenum 0.01%, calcium silicide 0.03%, niobium 0.01%, zirconium 0.01%, surplus is ferrum and inevitable impurity, wherein,
Gas content in steel is: [N]=200ppm, [H]=2ppm, [O]=50ppm.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting, comprises the following steps:
(1) making of alloy block: after the pig iron is broken into little granule, puts in vaccum sensitive stove and melts, add steel scrap,
Originate as ferrous substrate；Add calcium silicide and carry out desulfurization, deoxidation；Then carry out respectively being broken into little granule by carbon, the silicon of 1/2,
Being then placed in ball mill, under being passed through argon state, ball milling 20min, obtains composite powder；Put into multiple in vacuum induction furnace
Close powder, be heated to melting completely, fusion process uses refining agent refine, casts, cast after-baking etc., after cooling, make steel
Base；
(2) casting: put into by the steel billet of step (1) and be melted to molten condition in electric arc furnace, is incubated 1h, adds the most wherein
Enter carbon and the silicon alloy element of surplus, stir, be incubated 30min, then be added thereto to other remaining set alloying element,
Stir, sample after 1530 DEG C of refine 60min, insulation 35min, after analysis ingredient, adjusting component, fusing
20min, casting, tapping temperature is 1250 DEG C；
(3) forging and heat treatment: forge the profiled member in step (2), opens forging temperature 1430 DEG C, final forging temperature
820 DEG C, forging deformation amount 35%, foundry goods is warming up to 980 DEG C by the profiled member after forging and carries out normalizing, after normalized treatment
Send into be full of in the chamber type electric resistance furnace of nitrogen and be heated to 850 DEG C, be incubated 0.5h, then foundry goods taken out air cooling, be cooled to room
Continue to be fed into after temperature in chamber type electric resistance furnace and be tempered, be heated to 450 DEG C and be incubated 90 minutes, take out and naturally cool to room temperature and get final product.
Embodiment 2: the auto parts and components steel of a kind of antiwear heat resisting, the percentage by weight of described raw material be carbon 0.2%,
Silicon 0.35%, manganese 1%, phosphorus 0.008%, sulfur 0.001%, aluminum 0.04%, titanium 0.006%, nickel 0.009%, molybdenum 0.07%, silication
Calcium 0.003%, niobium 0.01%, zirconium 0.001%, surplus is ferrum and inevitable impurity, wherein, the gas content in steel
For: [N]=230ppm, [H]=1ppm, [O]=35ppm.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting, comprises the following steps:
(1) making of alloy block: after the pig iron is broken into little granule, puts in vaccum sensitive stove and melts, add steel scrap,
Originate as ferrous substrate；Add calcium silicide and carry out desulfurization, deoxidation；Then carry out respectively being broken into little granule by carbon, the silicon of 1/2,
Being then placed in ball mill, under being passed through argon state, ball milling 30min, obtains composite powder；Put into multiple in vacuum induction furnace
Close powder, be heated to melting completely, fusion process uses refining agent refine, casts, cast after-baking etc., after cooling, make steel
Base；
(2) casting: put into by the steel billet of step (1) and be melted to molten condition in electric arc furnace, is incubated 1h, adds the most wherein
Enter carbon and the silicon alloy element of surplus, stir, be incubated 20min, then it is first to be added thereto to other residue component alloy
Element, stirs, and samples after 1620 DEG C of refine 75min, insulation 35min, after analysis ingredient, and adjusting component, fusing
15min, casting, tapping temperature is 1250 DEG C；
(3) forging and heat treatment: forge the profiled member in step (2), opens forging temperature 1250 DEG C, final forging temperature
800 DEG C, forging deformation amount 38%, foundry goods is warming up to 950 DEG C by the profiled member after forging and carries out normalizing, after normalized treatment
Send into be full of in the chamber type electric resistance furnace of nitrogen and be heated to 850 DEG C, be incubated 0.5h, then foundry goods taken out air cooling, be cooled to room
Continue to be fed into after temperature in chamber type electric resistance furnace and be tempered, be heated to 550 DEG C and be incubated 90 minutes, take out and naturally cool to room temperature and get final product.
Embodiment 3: the auto parts and components steel of a kind of antiwear heat resisting, prepares including by the raw material of following percentage by weight
Form: carbon 0.18%, silicon 0.44%, manganese 1.3%, phosphorus 0.001%, sulfur 0.001%, aluminum 0.02%, titanium 0.01%, nickel
0.001%, molybdenum 0.1%, calcium silicide 0.0001%, niobium 0.001%, zirconium 0.01%, surplus is ferrum and inevitable impurity, its
In, the gas content in steel is: [N]=280ppm, [H]=2ppm, [O]=20ppm.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting, comprises the following steps:
(1) making of alloy block: after the pig iron is broken into little granule, puts in vaccum sensitive stove and melts, add steel scrap,
Originate as ferrous substrate；Add calcium silicide and carry out desulfurization, deoxidation；Then carry out respectively being broken into little granule by carbon, the silicon of 1/2,
Being then placed in ball mill, under being passed through argon state, ball milling 40min, obtains composite powder；Put into multiple in vacuum induction furnace
Close powder, be heated to melting completely, fusion process uses refining agent refine, casts, cast after-baking etc., after cooling, make steel
Base；
(2) casting: put into by the steel billet of step (1) and be melted to molten condition in electric arc furnace, is incubated 40min, then to it
The carbon of middle addition surplus and silicon alloy element, stir, and is incubated 25min, then is added thereto to other residue component alloy
Element, stirs, and samples after 1600 DEG C of refine 70min, insulation 30min, after analysis ingredient, and adjusting component, molten 15-
20min, casting, tapping temperature is 1430 DEG C；
(3) forging and heat treatment: forge the profiled member in step (2), opens forging temperature 1380 DEG C, final forging temperature
850 DEG C, forging deformation amount 40%, foundry goods is warming up to 960 DEG C by the profiled member after forging and carries out normalizing, after normalized treatment
Send into be full of in the chamber type electric resistance furnace of nitrogen and be heated to 850 DEG C, be incubated 40min, then foundry goods taken out air cooling, be cooled to room
Continue to be fed into after temperature in chamber type electric resistance furnace and be tempered, be heated to 500 DEG C and be incubated 90 minutes, take out and naturally cool to room temperature and get final product.
After process above step, obtain following data:
| Sequence number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Tensile strength sigma<sub>b</sub>(MPa) | 1173 | 1211 | 1259 |
| Yield strength σ 0.2 (MPa) | 1182 | 1168 | 1223 |
| Elongation percentage δ 5 (‰) | 14 | 12 | 17 |
| Contraction percentage of area ψ (‰) | 28 | 26 | 24 |
| Room temperature impact toughness α<sub>ku</sub>(42℃)(J/cm<sup>2</sup>) | 69 | 71 | 67 |
| Low-temperature impact toughness σ<sub>ku</sub>(-40℃) | 35 | 33 | 34 |
| Hardness | 30 | 36 | 31 |
Obviously the present invention implements and is not subject to the restrictions described above, as long as have employed method design and the skill of the present invention
The improvement of the various unsubstantialities that art scheme is carried out, or the most improved design by the present invention and technical scheme directly apply to it
Its occasion, all within protection scope of the present invention.
Claims (5)
1. the auto parts and components steel of an antiwear heat resisting, it is characterised in that include by the raw material system of following percentage by weight
For forming: carbon 0.18-0.22%, silicon 0.05-0.44%, manganese 1-1.5%, phosphorus ＜ 0.01%, sulfur ＜ 0.002%, aluminum 0.02-
0.07%, titanium 0.001-0.01%, nickel 0.001-0.15%, molybdenum 0.01-0.1%, calcium silicide 0.0001-0.03%, niobium
0.001-0.01%, zirconium 0.001-0.01%, surplus is ferrum and inevitable impurity, and wherein, the gas content in steel is:
[N]=200-280ppm, [H]≤2ppm, [O]=20-50ppm.
The auto parts and components steel of a kind of antiwear heat resisting the most according to claim 1, it is characterised in that: described raw material
Percentage by weight is carbon 0.2%, silicon 0.35%, manganese 1%, phosphorus 0.008%, sulfur 0.001%, aluminum 0.04%, titanium 0.006%, nickel
0.009%, molybdenum 0.07%, calcium silicide 0.003%, niobium 0.01%, zirconium 0.001%, surplus is ferrum and inevitable impurity, its
In, the gas content in steel is: [N]=230ppm, [H]=1ppm, [O]=35ppm.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting the most according to claim 1, it is characterised in that:
Comprise the following steps:
(1) making of alloy block: after the pig iron is broken into little granule, puts in vaccum sensitive stove and melts, add steel scrap, as
Ferrous substrate is originated；Add calcium silicide and carry out desulfurization, deoxidation；Then carbon, the silicon of 1/2 are carried out being broken into little granule, then respectively
Putting in ball mill, under being passed through noble gas state, ball milling 20-40min, obtains composite powder；Put in vacuum induction furnace
Composite powder, is heated to melting completely, uses refining agent refine, casts, casts after-baking etc., make steel after cooling in fusion process
Base；
(2) casting: put into by the steel billet of step (1) and be melted to molten condition in electric arc furnace, is incubated 0.5-1h, adds the most wherein
Enter carbon and the silicon alloy element of surplus, stir, be incubated 20-30min, then it is first to be added thereto to other residue component alloy
Element, stirs, and samples after 1530-1620 DEG C of refine 60-75min, insulation 25-35min, after analysis ingredient, adjusts
Composition, melts 15-20min, and casting, tapping temperature is 1250-1520 DEG C；
(3) forging and heat treatment: forge the profiled member in step (2), is warming up to foundry goods the profiled member after forging
950 DEG C-980 DEG C carry out normalizing, send in the chamber type electric resistance furnace of full nitrogen and be heated to 850 DEG C after normalized treatment, insulation
0.5-1h, then takes out air cooling by foundry goods, continues to be fed in chamber type electric resistance furnace and is tempered, be heated to 450-after being cooled to room temperature
550 DEG C are incubated 90 minutes, take out and naturally cool to room temperature and get final product.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting the most according to claim 3, it is characterised in that:
Forging condition in described step (3): open forging temperature >=1250 DEG C, final forging temperature >=800 DEG C, forging deformation amount >=35%.
The preparation method of the auto parts and components steel of a kind of antiwear heat resisting the most according to claim 3, it is characterised in that:
The noble gas that described step (1) uses is argon.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164628A (en) * | 2014-07-25 | 2014-11-26 | 合肥市瑞宏重型机械有限公司 | High-strength automobile engine cover steel material and manufacturing method thereof |
| CN104164630A (en) * | 2014-07-25 | 2014-11-26 | 合肥市瑞宏重型机械有限公司 | High-strength corrosion-resistant automobile accessory alloy steel material and manufacturing method thereof |
| CN104762440A (en) * | 2015-03-25 | 2015-07-08 | 芜湖华炀炉料科技有限公司 | Calcium deoxidizer using nano graphite powder as carrier and preparation method thereof |
| CN105463297A (en) * | 2015-12-30 | 2016-04-06 | 安徽悦众车身装备有限公司 | Cast steel axle housing for heavy truck |
-
2016
- 2016-06-12 CN CN201610421024.3A patent/CN106086636A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164628A (en) * | 2014-07-25 | 2014-11-26 | 合肥市瑞宏重型机械有限公司 | High-strength automobile engine cover steel material and manufacturing method thereof |
| CN104164630A (en) * | 2014-07-25 | 2014-11-26 | 合肥市瑞宏重型机械有限公司 | High-strength corrosion-resistant automobile accessory alloy steel material and manufacturing method thereof |
| CN104762440A (en) * | 2015-03-25 | 2015-07-08 | 芜湖华炀炉料科技有限公司 | Calcium deoxidizer using nano graphite powder as carrier and preparation method thereof |
| CN105463297A (en) * | 2015-12-30 | 2016-04-06 | 安徽悦众车身装备有限公司 | Cast steel axle housing for heavy truck |
Non-Patent Citations (1)
| Title |
|---|
| 曾正明主编: "《实用钢材手册》", 31 July 2015 * |
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