CN109536829A - A kind of automobile axle shaft applies seamless steel pipe and its production method - Google Patents
A kind of automobile axle shaft applies seamless steel pipe and its production method Download PDFInfo
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- CN109536829A CN109536829A CN201811320791.0A CN201811320791A CN109536829A CN 109536829 A CN109536829 A CN 109536829A CN 201811320791 A CN201811320791 A CN 201811320791A CN 109536829 A CN109536829 A CN 109536829A
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- steel pipe
- axle shaft
- seamless steel
- automobile axle
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to axle tube manufacture fields more particularly to a kind of automobile axle shaft to apply seamless steel pipe and its production method.Count by weight percentage, including following component: C, 0.42-0.49%, Si, 0.17-0.37%, Mn, 1.40-1.80%, P≤0.030%, S≤0.030%, Cr≤0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.30%.In this way, automotive axle housing tube, according to its handling characteristics, other than more demanding to geometric dimension, should also have certain hardness, wearability and high fatigue behaviour, therefore more demanding to the comprehensive mechanical performance of steel pipe, in order to make steel reach above-mentioned performance, by drop C, mentions Mn plus Cr etc. and improve intensity, hardness, toughness and wearability, simultaneously by reducing P, S content, purity of steel is promoted, the hot-short, cold short of steel is reduced, improves plasticity, the toughness of steel.It is had the advantage, that in terms of existing technologies by being adjusted to automotive axle housing tube optimization of Chemical Composition, it is ensured that steel pipe uniformity of hardness.
Description
Technical field
The present invention relates to axle tube manufacture fields more particularly to a kind of automobile axle shaft to apply seamless steel pipe and its producer
Method.
Background technique
Currently, seamless steel pipe is that one kind has hollow section, circumference weldless round or special section, it is a large amount of to be used as stream
Body pipeline or structural member, compared with solid steel, it is a kind of economy that the weight for bearing identical bending resistance torsional strength steel pipe can be lighter
Cross-section steel.
Automotive axle housing tube belongs to one kind of seamless steel pipe, is the wheel side bearing for automobile drive axle both ends, it is in vapour
In vehicle operation, the weight of entire vehicle body is not only born, the effect of Various Complex alternate stress, therefore automobile axle shaft are still suffered from
Set has high requirement to the intensity, rigidity and fatigue resistance of tube material, to guarantee vehicle safety.
Automotive axle housing tube is using the production of the steel such as 45Mn2,40Cr, 45, and outer diameter of steel pipes is usually in Φ 114mm hereinafter, diameter wall
Than (i.e. diameter/wall thickness) generally in 4-8, general only machining outer diameter and internal diameter does not machine, for such small-diameter thick-walled steel
Pipe generallys use small-sized oblique milling unit or the production of medium-sized Continuous mill train.But the production of small-sized oblique milling unit, steel pipe internal-surface pitted skin and
, easily there is spiral shape wall unevenness in the bad control of spiral, simultaneously because being influenced by charge length, fished pipe length is limited
System, production efficiency are low；And medium-sized Continuous mill train production, since base type is larger, in steel pipe, six sides and both ends are thickened obviously, in steel pipe
Diameter is unable to ensure.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of automobile axle shafts to apply seamless steel pipe and its production method, solution
Certainly the problem of conventionally produced low efficiency.
The technical scheme to solve the above technical problems is that a kind of automobile axle shaft applies seamless steel pipe, by weight
Percentage calculates, including following component:
C, 0.42-0.49%, Si, 0.17-0.37%, Mn, 1.40-1.80%, P≤0.030%, S≤0.030%, Cr
≤ 0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.30%.
Including following component further, count by weight percentage:
C, 0.43-0.47%, Si, 0.17-0.37%, Mn, 1.60-1.80%, P≤0.020%, S≤0.010%, Cr,
0.10-0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.20%.
Including following component further, count by weight percentage:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.010-0.020%, S, 0.005-0.010%, Cr, 0.15-
0.25%, Mo, 0.02-0.10%, Cu, 0.05-0.15%, Ni, 0.06-0.12%.
Including following component further, count by weight percentage:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.015%, S, 0.007%, Cr, 0.20%, Mo, 0.04%,
Cu, 0.06%, Ni, 0.08%.
A kind of automobile axle shaft applies the production method of seamless steel pipe, including applies seamless steel pipe preparation by the automobile axle shaft
Made of pipe；Specific steps are as follows:
S1: smelting pipe, using refining treatment；
S2: continuous casting, perforation and continuous rolling process processing are successively carried out to the pipe after refining；
S3: again by cooling after stretch reducing progress sizing processing；
S4: post-processing is carried out to pipe after cooling.
Further, in the step 1, refining treatment is carried out using ladle refining furnace.
Further, in the step S4, post-processing includes Pipe Cutting, aligning, flaw detection and inspection.
The present invention provides a kind of automobile axle shaft and applies seamless steel pipe, count by weight percentage, including following component:
C, 0.42-0.49%, Si, 0.17-0.37%, Mn, 1.40-1.80%, P≤0.030%, S≤0.030%, Cr
≤ 0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.30%.In this way, automotive axle housing tube is removed according to its handling characteristics
Except more demanding to geometric dimension, should also have certain hardness, wearability and high fatigue behaviour, therefore to steel pipe
Comprehensive mechanical performance is more demanding, in order to make steel reach above-mentioned performance, by drop C, mention Mn plus Cr etc. improve intensity, hardness,
Toughness and wearability, while by reducing P, S content, purity of steel is promoted, the hot-short, cold short of steel is reduced, improves the modeling of steel
Property, toughness.It has the advantage, that in terms of existing technologies by being adjusted to automotive axle housing tube optimization of Chemical Composition, really
Protect steel pipe uniformity of hardness.
A kind of automobile axle shaft applies the production method of seamless steel pipe, including applies seamless steel pipe preparation by the automobile axle shaft
Made of pipe；Specific steps are as follows: being smelted to pipe, using refining treatment；Successively to the pipe after refining
Carry out continuous casting, perforation and continuous rolling process processing；Again by cooling after stretch reducing progress sizing processing；To pipe after cooling into
Row post-processing.In this way, automobile axle shaft is applied, the stable mechanical property of seamless steel pipe, hardness are uniform, steel is pure, dimensional accuracy
Height, surface quality is good, without interior six side, fully meets automotive axle housing tube high intensity, high rigidity, high tenacity and high dimensional accuracy
Very special quality requirement.
Detailed description of the invention
Fig. 1 is the production method flow diagram that a kind of automobile axle shaft of the present invention applies seamless steel pipe.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
The present invention provides a kind of automobile axle shaft and applies seamless steel pipe, count by weight percentage, including following component:
C, 0.42-0.49%, Si, 0.17-0.37%, Mn, 1.40-1.80%, P≤0.030%, S≤0.007%, Cr
≤ 0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.30%.In this way, automotive axle housing tube is removed according to its handling characteristics
Except more demanding to geometric dimension, should also have certain hardness, wearability and high fatigue behaviour, therefore to steel pipe
Comprehensive mechanical performance is more demanding, in order to make steel reach above-mentioned performance, by drop C, mention Mn plus Cr etc. improve intensity, hardness,
Toughness and wearability, while by reducing P, S content, purity of steel is promoted, the hot-short, cold short of steel is reduced, improves the modeling of steel
Property, toughness.It has the advantage, that in terms of existing technologies by being adjusted to automotive axle housing tube optimization of Chemical Composition, really
Protect steel pipe uniformity of hardness.
Embodiment 1:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.42%, Si, 0.17%, Mn, 1.40%, P, 0.030%, S, 0.030%, Cr, 0.25%, Mo, 0.10%,
C, 0.20%, Ni, 0.30%.
Embodiment 2:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.43%, Si, 0.177%, Mn, 1.60%, P, 0.020%, S, 0.010%, Cr, 0.10%, Mo,
0.10%, Cu, 0.20%, Ni, 0.20%.
Embodiment 3:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.010, %, S, 0.005%, Cr, 0.15, Mo, 0.02%,
Cu, 0.05%, Ni, 0.06%.
Embodiment 4:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.015%, S, 0.007%, Cr, 0.20%, Mo, 0.04%,
Cu, 0.06%, Ni, 0.08%.
Embodiment 5:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.42%, Si, 0.28%, Mn, 1.71%, P, 0.018%, S, 0.007%, Cr, 0.19%, Mo, 0.02%,
Cu, 0.06%, Ni, 0.09%.
Embodiment 6:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.45%, Si, 0.25%, Mn, 1.62%, P, 0.015%, S, 0.006%, Cr, 0.21%, Mo, 0.04%,
Cu, 0.05%, Ni, 0.08%.
Embodiment 7:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.47%, Si, 0.30%, Mn, 1.75%, P, 0.012%, S, 0.008%, Cr, 0.20%, Mo, 0.05%,
Cu, 0.07%, Ni, 0.07%.
Embodiment 8:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.020%, S, 0.010%, Cr, 0.25%, Mo, 0.10%,
Cu, 0.15%, Ni, 0.12%
Embodiment 9:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.47%, Si, 0.37%, Mn, 1.80%, P, 0.020%, S, 0.010%, Cr, 0.25%, Mo, 0.10%,
Cu, 0.20%, Ni, 0.20%.
Embodiment 10:
A kind of automobile axle shaft applies seamless steel pipe, count by weight percentage, including following component:
C, 0.49%, Si, 0.37%, Mn, 1.80%, P, 0.030%, S, 0.030%, Cr, 0.25%, Mo, 0.10%,
Cu, 0.20%, Ni, 0.30%.
The present invention is illustrated below in conjunction with 77*10 45Mn2.
1, pipe is smelted
By smelting and continuous casting, the pipe of example 1 to 3 is obtained.The chemical component of the pipe of example 1 to 3 is as shown in table 1.
The chemical component (wt%) of the pipe of embodiment 1 to 10
Table 1
In converter smelting, external refining, continuous casting production process, operated in strict accordance with specification, make steel chemistry at
Point uniformly, steel it is pure.
2, steel pipe rolling
Using 89 Continuous mill train of Φ (six racks, three roller retained mandrel), using Φ 150mm round billet, in annular furnace 1240 ± 10
DEG C heating, heating time 120min, by perforation, tandem rolling (using system of fining away end to end), by stretch-reducing mill (use CEC
System) 750-800 DEG C of finishing temperature of the circular hole (ellipse coefficient 1.02-1.03) specially designed and control are installed, then exist
Walking beam cooler carries out air-cooled.
3, steel tube performance detects
The performance test results that the automobile axle shaft of example 1-3 applies seamless steel pipe are shown in Table 2~table 3.
Embodiment 1-10 ambient temperature mechanical properties inspection result
Table 2
Embodiment 1-10 examination of nonmetallic inclusion result
Table 3
From table 2- table 3 as can be seen that automobile axle shaft of the invention to apply seamless steel pipe steel pure, it is with higher strong
Degree, hardness and toughness, and performance is uniform, fully meets automobile axle shaft and applies wanting for seamless steel pipe (YB/T 5035-2010)
It asks.
The detection of steel pipe geometric dimension
The geometric dimension testing result that the automobile axle shaft of embodiment 1-10 applies seamless steel pipe is shown in Table 4.
Table 4
| Embodiment | Specification (mm) | Outer diameter (mm) | Internal diameter (mm) |
| 1 | 77*10 | 76.7-77.2 | 57.2-58.1 |
| 2 | 77*10 | 76.8-77.2 | 57.1-58.1 |
| 3 | 77*10 | 76.9-77.3 | 57.3-58.0 |
| 4 | 77*10 | 76.8-77.1 | 57.2-57.8 |
| 1 | 77*10 | 76.7-77.0 | 57.1-58.0 |
| 2 | 77*10 | 76.9-77.3 | 57.0-57.8 |
| 3 | 77*10 | 76.8-77.2 | 57.2-58.2 |
| 8 | 77*10 | 76.9-77.3 | 57.2-58.0 |
| 9 | 77*10 | 76.8-77.2 | 57.1-58.0 |
| 10 | 77*10 | 76.7-77.2 | 57.2-58.2 |
From table 4, it can be seen that outer diameter of steel pipes is between 76.7-77.3mm, ovality maximum 0.4mm, internal diameter between
Between 57.0-58.2mm, ovality maximum 1.0mm, fully meet user's outer diameter ± 0.5mm, internal diameter -0.5mm/+1.5mm is wanted
It asks.
A kind of automobile axle shaft of the invention applies the production method of seamless steel pipe, as shown in Figure 1: includes by the automobile half
The pipe that axle sleeve is prepared with seamless steel pipe；Specific steps are as follows: being smelted to pipe, using refining treatment；
Continuous casting, perforation and continuous rolling process processing are successively carried out to the pipe after refining；Again by cold after stretch reducing progress sizing processing
But；Post-processing is carried out to pipe after cooling.In this way, to apply the stable mechanical property of seamless steel pipe, hardness equal for automobile axle shaft
It is even, steel is pure, dimensional accuracy is high, surface quality is good, without interior six side, and it is high-intensitive, high hard to fully meet automotive axle housing tube
The very special quality requirement of degree, high tenacity and high dimensional accuracy.
A kind of automobile axle shaft of the invention applies the production method of seamless steel pipe, as shown in Figure 1, the technology described in front
On the basis of scheme it may also is that in the step 1, refining treatment is carried out using ladle refining furnace.
A kind of automobile axle shaft of the invention applies the production method of seamless steel pipe, as shown in Figure 1, the technology described in front
It may also is that post-processing includes Pipe Cutting, aligning, flaw detection and inspection in the step S4 on the basis of scheme.
Converter smelting → LF furnace refining → continuously cast billet for pipe-making → perforation → tandem rolling → stretch reducing → cold bed → Pipe Cutting → aligning
→ flaw detection → inspection → steel pipe finished product
According to the present invention a kind of production method of 45Mn2 automotive axle housing tube comprising steps of
A, pipe is smelted, the chemical component of the pipe is by being calculated as: C 0.42-0.49%, Si 0.17-0.37%, Mn
1.40-1.80%, P≤0.030%, S≤0.030%, Cr≤0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.30%
And the Fe and inevitable impurity of surplus.
B, chemical component is preferred: C 0.43-0.47%, Si 0.17-0.37%, Mn 1.60-1.80%, P≤
0.020%, S≤0.010%, Cr 0.10-0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.20%.
C, course of hot rolling controls: utilizing 89 Continuous mill train of Φ, using Φ 150mm round billet, adds at 1240 ± 10 DEG C of annular furnace
Heat, heating time 120min pass through stretch-reducing mill (being equipped with CEC system) by perforation, tandem rolling (being equipped with system of fining away end to end)
750-800 DEG C of finishing temperature of circular hole (ellipse coefficient 1.02-1.03) and control for installing special designing, then in step-by-step movement
Cold bed carries out air-cooled.
Automotive axle housing tube other than more demanding to geometric dimension, should also have certain according to its handling characteristics
Hardness, wearability and high fatigue behaviour, thus it is more demanding to the comprehensive mechanical performance of steel pipe.In order to make steel reach above-mentioned property
Can, it by drop C, mentions Mn plus Cr etc. and improves intensity, hardness, toughness and wearability, while by reducing P, S content, promoting steel
Matter degree of purity reduces the hot-short, cold short of steel, improves plasticity, the toughness of steel.Therefore the chemical component of steel is set by preferred component
Meter.
The best match of intensity, hardness, toughness and wearability in order to obtain, it is desirable that steel pipe should be using rolling normalizing molding side
Formula, therefore ring oven heating temperature, mill speed, finishing temperature etc. are controlled, since the Ar3 of 45Mn2 steel is at 704 DEG C or so,
Therefore by steel pipe finishing temperature control at 750-800 DEG C.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of automobile axle shaft applies seamless steel pipe, which is characterized in that count by weight percentage, including following component:
C, 0.42-0.49%, Si, 0.17-0.37%, Mn, 1.40-1.80%, P≤0.030%, S≤0.030%, Cr≤
0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.30%.
2. automobile axle shaft according to claim 1 applies seamless steel pipe, which is characterized in that count by weight percentage, packet
Include following component:
C, 0.43-0.47%, Si, 0.17-0.37%, Mn, 1.60-1.80%, P≤0.020%, S≤0.010%, Cr,
0.10-0.25%, Mo≤0.10%, Cu≤0.20%, Ni≤0.20%.
3. automobile axle shaft according to claim 2 applies seamless steel pipe, which is characterized in that count by weight percentage, packet
Include following component:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.010-0.020%, S, 0.005-0.010%, Cr, 0.15-
0.25%, Mo, 0.02-0.10%, Cu, 0.05-0.15%, Ni, 0.06-0.12%.
4. automobile axle shaft according to claim 3 applies seamless steel pipe, which is characterized in that count by weight percentage, packet
Include following component:
C, 0.45%, Si, 0.27%, Mn, 1.7%, P, 0.015%, S, 0.007%, Cr, 0.20%, Mo, 0.04%, Cu,
0.06%, Ni, 0.08%.
5. the production method that a kind of automobile axle shaft applies seamless steel pipe, which is characterized in that including by claim 1-4 any one
The automobile axle shaft applies the pipe that seamless steel pipe is prepared；Specific steps are as follows:
S1: smelting pipe, using refining treatment；
S2: continuous casting, perforation and continuous rolling process processing are successively carried out to the pipe after refining；
S3: again by cooling after stretch reducing progress sizing processing；
S4: post-processing is carried out to pipe after cooling.
6. the production method that automobile axle shaft according to claim 5 applies seamless steel pipe, it is characterised in that: the step 1
In, refining treatment is carried out using ladle refining furnace.
7. the production method that automobile axle shaft according to claim 5 applies seamless steel pipe, it is characterised in that: the step S4
In, post-processing includes Pipe Cutting, aligning, flaw detection and inspection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320791.0A CN109536829A (en) | 2018-11-07 | 2018-11-07 | A kind of automobile axle shaft applies seamless steel pipe and its production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320791.0A CN109536829A (en) | 2018-11-07 | 2018-11-07 | A kind of automobile axle shaft applies seamless steel pipe and its production method |
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| Publication Number | Publication Date |
|---|---|
| CN109536829A true CN109536829A (en) | 2019-03-29 |
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ID=65844965
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043935A (en) * | 2002-07-15 | 2004-02-12 | Sumitomo Metal Ind Ltd | Martensitic stainless steel seamless steel tube and method of producing the same |
| CN101956137A (en) * | 2010-10-12 | 2011-01-26 | 衡阳华菱钢管有限公司 | Seamless steel tube for manufacturing hollow core rod and production method |
| CN102527767A (en) * | 2011-11-22 | 2012-07-04 | 玛切嘉利（中国）有限责任公司 | Cold drawing welded tube manufacture process for high-accuracy hydraulic oil cylinder |
| CN202845437U (en) * | 2012-09-29 | 2013-04-03 | 湖北新冶钢有限公司 | Hole pattern of micro tension tube reducing unit |
-
2018
- 2018-11-07 CN CN201811320791.0A patent/CN109536829A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043935A (en) * | 2002-07-15 | 2004-02-12 | Sumitomo Metal Ind Ltd | Martensitic stainless steel seamless steel tube and method of producing the same |
| CN101956137A (en) * | 2010-10-12 | 2011-01-26 | 衡阳华菱钢管有限公司 | Seamless steel tube for manufacturing hollow core rod and production method |
| CN102527767A (en) * | 2011-11-22 | 2012-07-04 | 玛切嘉利（中国）有限责任公司 | Cold drawing welded tube manufacture process for high-accuracy hydraulic oil cylinder |
| CN202845437U (en) * | 2012-09-29 | 2013-04-03 | 湖北新冶钢有限公司 | Hole pattern of micro tension tube reducing unit |
Non-Patent Citations (1)
| Title |
|---|
| 李平凡: "圆坯连铸生产45Mn2钢的工艺实践", 《炼钢》 * |
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