CN108048750A - A kind of corrosion-resistant tensile type steel alloy and its production technology - Google Patents
A kind of corrosion-resistant tensile type steel alloy and its production technology Download PDFInfo
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- CN108048750A CN108048750A CN201711343705.3A CN201711343705A CN108048750A CN 108048750 A CN108048750 A CN 108048750A CN 201711343705 A CN201711343705 A CN 201711343705A CN 108048750 A CN108048750 A CN 108048750A
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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
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- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
Abstract
The invention discloses a kind of corrosion-resistant tensile type steel alloys, are related to metal smelt technical field.The mass percent of its chemical composition is：C：0.22 0.31%, Cr：4.36 5.24%, Al：0.71 0.74%, Zn：0.33 0.46%, Cu：0.41 0.58%, Ti：0.45 0.49%, Si：0.11 0.19%, W：0.12 0.15%, Nb：0.12 0.14%, Mn：0.14 0.17%, surplus is Fe and inevitable impurity.The invention also discloses a kind of preparation methods of corrosion-resistant tensile type steel alloy, can not only improve the hardness and tensile strength of steel alloy, while can also improve the corrosion resistance of steel alloy, effectively extend the service life of steel alloy.
Description
Technical field
The present invention relates to metal smelt technical field, more particularly to a kind of corrosion-resistant tensile type steel alloy and its production work
Skill.
Background technology
Steel is the general designation of the iron-carbon alloy to phosphorus content mass percent between 0.02% to 2.11%.The change of steel
Studying point can be with great changes have taken place, and the steel containing only carbon is known as carbon steel (carbon steel) or ordinary steel；In actual production, steel is past
It is past to contain different alloying elements according to the difference of purposes, such as：Manganese, nickel, vanadium etc..Application and research history of the mankind to steel
It is quite long, but before the Bessemerizing invention of 19th century, steel produce all be a high efficiency at low cost work.
Nowadays, steel becomes one of most commonly used material in the world with its cheap price, reliable performance, is construction industry, manufacturing industry
With ingredient indispensable in people's daily life, it may be said that steel is the material base of modern society.
Current existing steel hardness generally all meets basic demand, but steel plasticity is poor, is easily sent out when receiving stretching
Raw brittle fracture, and corrosion resistance of steel can be poor, service life is shorter.
The content of the invention
The shortcomings that technical problems to be solved by the invention are, overcome the prior art provides a kind of corrosion-resistant tensile type and closes
Golden steel and its production technology, can not only improve the hardness and tensile strength of steel alloy, while can also improve the resistance to of steel alloy
Corrosive nature effectively extends the service life of steel alloy.
In order to solve the above technical problems, technical scheme is as follows：
A kind of corrosion-resistant tensile type steel alloy, the mass percent of chemical composition are：C：0.22-0.31%, Cr：4.36-
5.24%, Al：0.71-0.74%, Zn：0.33-0.46%, Cu：0.41-0.58%, Ti：0.45-0.49%, Si：0.11-
0.19%, W：0.12-0.15%, Nb：0.12-0.14%, Mn：0.14-0.17%, surplus are Fe and inevitable impurity.
Further, the mass percent of chemical composition is：C：0.26%, Cr：4.79%, Al：0.73%, Zn：
0.39%, Cu：0.49%, Ti：0.47%, Si：0.15%, W：0.14%, Nb：0.13%, Mn：0.16%, surplus for Fe and
Inevitable impurity.
The present invention also provides a kind of preparation methods of corrosion-resistant tensile type steel alloy, it is characterised in that：Including following step
Suddenly：
S1：Each raw material is added according to mass percent in smelting furnace, the temperature of smelting furnace is adjusted to 1580-1680 DEG C, melting
When 1-2 is small, raw material is smelted into alloy solution, and desulfurization, deoxidation treatment are carried out to alloy solution, refining agent is added and carries out essence
Refining slagging-off；
S2：Alloy solution is injected into casting ladle, and microalloy treatment is carried out to the alloy solution in casting ladle using rare earth alloy magnesium,
Alloy solution is poured into mold progress casting mold after processing and obtains steel；
S3：Steel are heat-treated, steel are put into heating furnace, are heated to 810-840 DEG C, keep the temperature 30-45 minutes, then
It cools to 400-450 DEG C with the furnace, then takes out steel, be air-cooled to room temperature, then steel are put into heating furnace again, slowly add
Heat keeps the temperature 45-50 minutes to 500-550 DEG C, then by heat steel to 600-625 DEG C, then air-cooled water cooling combines and is cooled to room
Then steel are put into heating furnace by temperature again, be heated to 200-250 DEG C, are then kept the temperature 60-75 minutes, are finally air-cooled to room temperature；
S4：Steel after heat treatment are positioned in gas nitriding furnace and NH3 is passed through into stove, stove is warming up to 480-510 DEG C,
When keeping 22-24 small；
S5：Steel are taken out, ultrasonic examination is carried out, finished product is obtained after detection is qualified.
A kind of preparation method of preceding corrosion-resistant tensile type steel alloy, the quality of S2 middle rare earth alloys magnesiums are total for raw material
The 14%-16% of quality.
A kind of preparation method of preceding corrosion-resistant tensile type steel alloy, the cooling velocity that S3 hollow colds water cooling combines are
28-32℃/s。
The beneficial effects of the invention are as follows：
(1) in the present invention, C and W is added in the feed, tungsten carbide, tungsten carbide hardness and Buddha's warrior attendant can be formed in high melt
Stone is similar, and wearability is strong, can improve the hardness and wear resistance of steel, adds in silicon as reducing agent and antioxidant, can be notable
The elastic limit of steel is improved, improves tensile property；Al and Zn is added in raw material, Zn can be solid-solubilized in Al based solid solutions in melting
In, distortion of lattice is caused, distortion of lattice increases the resistance of dislocation motion, is difficult to sliding, so that Alloy solid solution
Intensity and hardness all dramatically increase, so as to improve the tensile strength of steel；
(2) in the present invention, microalloy treatment is carried out to alloy solution using rare earth alloy magnesium, it can be with metal in refiner material
Crystal grain makes steel have higher toughness and intensity, so as to improve the tensile property of steel；
(3) in the present invention, to steel anneal-quenching-heat treatment operation being tempered, while steel hardness strength is improved
Toughness can also be improved；
(4) in the present invention, nitrogen treatment is carried out to the steel after heat treatment, makes some metallic elements in raw material in nitriding temperature
In contacted with nitrogen-atoms, form stable nitride, so as to improve cable testing bridge with excellent wearability, fatigue durability and
Corrosion resistance.
Specific embodiment
For present disclosure is made to be easier to be clearly understood, below according to specific embodiment, the present invention is made
Further details of explanation.
Embodiment 1
A kind of corrosion-resistant tensile type steel alloy provided in this embodiment, the mass percent of chemical composition are：C：0.22%,
Cr：4.36%, Al：0.71%, Zn：0.33%, Cu：0.41%, Ti：0.45%, Si：0.11%, W：0.12%, Nb：
0.12%, Mn：0.14%, surplus is Fe and inevitable impurity.
A kind of preparation method of corrosion-resistant tensile type steel alloy provided in this embodiment, comprises the following steps：S1：By each original
Material is added according to mass percent in smelting furnace, and the temperature of smelting furnace is adjusted to 1580 DEG C, when melting 1 is small, raw material is smelted into
Alloy solution, and desulfurization, deoxidation treatment are carried out to alloy solution, it adds refining agent and carries out refining slagging-off；
S2：Alloy solution is injected into casting ladle, and microalloy treatment is carried out to the alloy solution in casting ladle using rare earth alloy magnesium,
Alloy solution is poured into mold progress casting mold after processing and obtains steel, the wherein quality of rare earth alloy magnesium is raw material gross mass
14%；
S3：Steel are heat-treated, steel are put into heating furnace, are heated to 810 DEG C, 30 minutes are kept the temperature, then with furnace cooling
But to 400 DEG C, then steel are taken out, room temperature is air-cooled to, then steel is put into heating furnace again, are slowly heated to 500 DEG C,
Heat preservation 45 minutes, then by heat steel to 600 DEG C, the mode that then air-cooled water cooling combines is by steel with the cooling velocity of 28 DEG C/s
It is cooled to room temperature, then steel is put into heating furnace again, be heated to 200 DEG C, then keep the temperature 60 minutes, be finally air-cooled to room
Temperature；
S4：Steel after heat treatment are positioned in gas nitriding furnace and NH3 is passed through into stove, stove is warming up to 480 DEG C, is kept
22 it is small when；
S5：Steel are taken out, ultrasonic examination is carried out, finished product is obtained after detection is qualified.
Embodiment 2
A kind of corrosion-resistant tensile type steel alloy provided in this embodiment, the mass percent of chemical composition are：C：0.31%,
Cr：5.24%, Al：0.74%, Zn：0.46%, Cu：0.58%, Ti：0.49%, Si：0.19%, W：0.15%, Nb：
0.14%, Mn：0.17%, surplus is Fe and inevitable impurity.
A kind of preparation method of corrosion-resistant tensile type steel alloy provided in this embodiment, comprises the following steps：S1：By each original
Material is added according to mass percent in smelting furnace, and the temperature of smelting furnace is adjusted to 1680 DEG C, when melting 2 is small, raw material is smelted into
Alloy solution, and desulfurization, deoxidation treatment are carried out to alloy solution, it adds refining agent and carries out refining slagging-off；
S2：Alloy solution is injected into casting ladle, and microalloy treatment is carried out to the alloy solution in casting ladle using rare earth alloy magnesium,
Alloy solution is poured into mold progress casting mold after processing and obtains steel, the wherein quality of rare earth alloy magnesium is raw material gross mass
16%；
S3：Steel are heat-treated, steel are put into heating furnace, are heated to 840 DEG C, 45 minutes are kept the temperature, then with furnace cooling
But to 450 DEG C, then steel are taken out, room temperature is air-cooled to, then steel is put into heating furnace again, are slowly heated to 550 DEG C,
Heat preservation 50 minutes, then by heat steel to 625 DEG C, the mode that then air-cooled water cooling combines is by steel with the cooling velocity of 32 DEG C/s
It is cooled to room temperature, then steel is put into heating furnace again, be heated to 250 DEG C, then keep the temperature 75 minutes, be finally air-cooled to room
Temperature；
S4：Steel after heat treatment are positioned in gas nitriding furnace and NH3 is passed through into stove, stove is warming up to 510 DEG C, is kept
24 it is small when；
S5：Steel are taken out, ultrasonic examination is carried out, finished product is obtained after detection is qualified.
Embodiment 3
A kind of corrosion-resistant tensile type steel alloy provided in this embodiment, the mass percent of chemical composition are：C：0.26%,
Cr：4.79%, Al：0.73%, Zn：0.39%, Cu：0.49%, Ti：0.47%, Si：0.15%, W：0.14%, Nb：
0.13%, Mn：0.16%, surplus is Fe and inevitable impurity.
A kind of preparation method of corrosion-resistant tensile type steel alloy provided in this embodiment, comprises the following steps：S1：By each original
Material is added according to mass percent in smelting furnace, the temperature of smelting furnace is adjusted to 1630 DEG C, when melting 1.5 is small, by raw material melting
Desulfurization, deoxidation treatment are carried out into alloy solution, and to alloy solution, refining agent is added and carries out refining slagging-off；
S2：Alloy solution is injected into casting ladle, and microalloy treatment is carried out to the alloy solution in casting ladle using rare earth alloy magnesium,
Alloy solution is poured into mold progress casting mold after processing and obtains steel, the wherein quality of rare earth alloy magnesium is raw material gross mass
15%；
S3：Steel are heat-treated, steel are put into heating furnace, are heated to 825 DEG C, 38 minutes are kept the temperature, then with furnace cooling
But to 425 DEG C, then steel are taken out, room temperature is air-cooled to, then steel is put into heating furnace again, are slowly heated to 525 DEG C,
Heat preservation 48 minutes, then by heat steel to 615 DEG C, the mode that then air-cooled water cooling combines is by steel with the cooling velocity of 30 DEG C/s
It is cooled to room temperature, then steel is put into heating furnace again, be heated to 225 DEG C, then keep the temperature 68 minutes, be finally air-cooled to room
Temperature；
S4：Steel after heat treatment are positioned in gas nitriding furnace and NH3 is passed through into stove, stove is warming up to 495 DEG C, is kept
23 it is small when；
S5：Steel are taken out, ultrasonic examination is carried out, finished product is obtained after detection is qualified.
By common iron as a comparison case, 1~embodiment of embodiment 3 and comparative example are subjected to performance comparison test, it is every
Performance is measured by national standard, and experimental condition and other experiment material all sames, test result are as shown in table 1：
| Pilot project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Brinell hardness/HB | 254 | 256 | 275 | 238 |
| Tensile strength/MPa | 656.5 | 634.8 | 692.5 | 602.4 |
| The contraction percentage of area/% | 25.3 | 25.8 | 26.4 | 22.1 |
| Year corrosion depth | ≤0.05 | ≤0.05 | ≤0.03 | ≤0.06 |
Table 1
As can be seen from Table 1, whether Brinell hardness, tensile strength or the contraction percentage of area, 1~embodiment of embodiment 3 are high
In comparative example, and year corrosion depth is then the respectively less than comparative example of 1~embodiment of embodiment 3, it can thus be seen that prepared by the present invention
Corrosion-resistant tensile type steel alloy, not only intensity higher, tensile property is more preferable, and Corrosion Protection is also more superior.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the present invention claims protection domain.
Claims (6)
1. a kind of corrosion-resistant tensile type steel alloy, it is characterised in that：The mass percent of its chemical composition is：C：0.22-
0.31%, Cr：4.36-5.24%, Al：0.71-0.74%, Zn：0.33-0.46%, Cu：0.41-0.58%, Ti：0.45-0.49%,
Si：0.11-0.19%, W：0.12-0.15%, Nb：0.12-0.14%, Mn：0.14-0.17%, surplus for Fe and inevitably it is miscellaneous
Matter.
2. a kind of corrosion-resistant tensile type steel alloy according to claim 1, it is characterised in that：The quality hundred of its chemical composition
Point ratio is：C：0.26%, Cr：4.79%, Al：0.73%, Zn：0.39%, Cu：0.49%, Ti：0.47%, Si：0.15%, W：0.14%,
Nb：0.13%, Mn：0.16%, surplus is Fe and inevitable impurity.
3. a kind of preparation method of corrosion-resistant tensile type steel alloy as described in claim 1, it is characterised in that：Including following step
Suddenly：
S1：Each raw material is added according to mass percent in smelting furnace, the temperature of smelting furnace is adjusted to 1580-1680 DEG C, melting
When 1-2 is small, raw material is smelted into alloy solution, and desulfurization, deoxidation treatment are carried out to alloy solution, refining agent is added and carries out essence
Refining slagging-off；
S2：Alloy solution is injected into casting ladle, and microalloy treatment is carried out to the alloy solution in casting ladle using rare earth alloy magnesium,
Alloy solution is poured into mold progress casting mold after processing and obtains steel；
S3：Steel are heat-treated, steel are put into heating furnace, are heated to 810-840 DEG C, keep the temperature 30-45 minutes, then
It cools to 400-450 DEG C with the furnace, then takes out steel, be air-cooled to room temperature, then steel are put into heating furnace again, slowly add
Heat keeps the temperature 45-50 minutes to 500-550 DEG C, then by heat steel to 600-625 DEG C, then air-cooled water cooling combines and is cooled to room
Then steel are put into heating furnace by temperature again, be heated to 200-250 DEG C, are then kept the temperature 60-75 minutes, are finally air-cooled to room temperature；
S4：Steel after heat treatment are positioned in gas nitriding furnace and NH3 is passed through into stove, stove is warming up to 480-510 DEG C,
When keeping 22-24 small；
S5：Steel are taken out, ultrasonic examination is carried out, finished product is obtained after detection is qualified.
4. a kind of preparation method of corrosion-resistant tensile type steel alloy according to claim 3, it is characterised in that：In the S1
Raw material adds successively according to the order of fusing point from high to low.
5. a kind of preparation method of corrosion-resistant tensile type steel alloy according to claim 3, it is characterised in that：In the S2
The quality of rare earth alloy magnesium is the 14%-16% of raw material gross mass.
6. a kind of preparation method of corrosion-resistant tensile type steel alloy according to claim 3, it is characterised in that：In the S3
The cooling velocity that air-cooled water cooling combines is 28-32 DEG C/s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055870A (en) * | 2018-08-24 | 2018-12-21 | 江苏华太电力仪表有限公司 | A kind of split-body valve hatpin valve stainless steel material and preparation method thereof |
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|---|---|---|---|---|
| CN101542004A (en) * | 2007-04-18 | 2009-09-23 | 新日本制铁株式会社 | Hot-worked steel material having excellent machinability and impact value |
| CN104404380A (en) * | 2014-11-07 | 2015-03-11 | 江苏天舜金属材料集团有限公司 | High strength steel bar for pre-stressed concrete and production technology thereof |
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2017
- 2017-12-15 CN CN201711343705.3A patent/CN108048750A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101542004A (en) * | 2007-04-18 | 2009-09-23 | 新日本制铁株式会社 | Hot-worked steel material having excellent machinability and impact value |
| CN104404380A (en) * | 2014-11-07 | 2015-03-11 | 江苏天舜金属材料集团有限公司 | High strength steel bar for pre-stressed concrete and production technology thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109055870A (en) * | 2018-08-24 | 2018-12-21 | 江苏华太电力仪表有限公司 | A kind of split-body valve hatpin valve stainless steel material and preparation method thereof |
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