CN104294170A - Alloy material for high-strength steel pull rod and treatment technology thereof - Google Patents
Alloy material for high-strength steel pull rod and treatment technology thereof Download PDFInfo
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- CN104294170A CN104294170A CN201410622554.5A CN201410622554A CN104294170A CN 104294170 A CN104294170 A CN 104294170A CN 201410622554 A CN201410622554 A CN 201410622554A CN 104294170 A CN104294170 A CN 104294170A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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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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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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- 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
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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
The invention discloses an alloy material for a high-strength steel pull rod and a treatment technology thereof. A nickel element is added; the strength and the toughness of the steel pull rod are improved; the hardenability and the corrosion resistance are improved; the atomic activities of a C element and an N element are improved so that an air mass formed by each atom can form a strong interaction with dislocation. Meanwhile, in the treatment process, a vacuum degasification furnace is used for performing degasification; die casting is protected by argon gas so that an air hole is avoided in a product and the quality of the product is further improved. The alloy material for the high-strength steel pull rod and the treatment technology thereof designed by the invention overcome the defect of the prior art and have the advantages of high strength, no pollution, good hardenability, difficulty to crack and low looseness.
Description
Technical field
The present invention relates to a kind of high-strength steel tension rod alloy material and treatment process thereof.
Background technology
Crucial effect is played in a lot of field that is used in of current valve; environment for use due to Steel Rod is subject to the impact of its material, and Steel Rod also existing defects, as: abrasion-resistant ability is low; resistance to elevated temperatures is poor; intensity is low, and work-ing life is short, because the yield strength of Steel Rod is lower; by human activity loading action in construction process; often make the stressed flexural deformation of Steel Rod, the structure restriction of Steel Concrete protection thickness can not be met and produce crack, causing construction quality hidden danger.
In prior art, in steel material composition, the atom active of carbon and nitrogen element is lower, the air mass that each atom is formed can not form strong interaction with dislocation, extraneous without the need to providing larger stress just can start dislocation, thus make performance very unstable, simultaneously in Steel Rod forging stock, hydrogen richness is at more than 2.0ppm, and Steel Rod forging stock easily cracks thus brings out hydrogen induced cracking and hydrogen causes delay delayed fracture.
Summary of the invention
Goal of the invention: the object of the invention is the shortcoming in order to overcome prior art, provides a kind of intensity is high, pollution-free, hardening capacity is good, not easy to crack and degree of relaxation is low high-strength steel tension rod alloy material and treatment process thereof.
In order to solve the problems of the technologies described above, the present invention devises a kind of high-strength steel tension rod alloy material, its weight percent composition is: carbon: 0.30%-0.35%, silicon: 0-0.30%, manganese: 0-0.90%, chromium: 0.80%-1.20%, nickel: 3.50%-4.00%, molybdenum: 0.50%-0.60%, phosphorus: 0-0.015%, sulphur: 0-0.015%, hydrogen: 0-2.0ppm, vanadium: 0.10%-0.20%, titanium: 0-0.020%, copper: 0-0.20%, aluminium: 0-0.05%, rare earth: 0.12-0.15%, trace impurity: 0-0.50%, all the other are Fe;
In rare earth, comprise following component by weight percentage: Eu:5.3-5.5%, Pr:12.4-12.6%, Dy:3.6-3.9%, Ac:7.6-7.8%, Nd:5.8-6.0%, Sm:11.5-11.8%, Ce:15.3-15.5%, Lu:13-15%, surplus is La;
Technique effect: the present invention with chromium nickel-molybdenum alloy structure iron for blank, the toughness of steel, elasticity, wear resistance can be improved and resist performance, and make steel tight, and the vanadium in steel is highly stable, not easily by hydrochloric acid, sulfuric acid decompose, add the steel hardenability after vanadium good, the whole cross section of steel part can be made to obtain the mechanical property of uniformity and the quenching medium that steel part quenching stress is little can be selected, to reduce distortion and cracking;
Nickel element is added in the present invention, firm intensity and toughness can be improved, improve the hardening capacity of steel, some physicalies of steel can be changed, and improve the resistance to corrosion of steel, thus the atom active of C and N element can be improved, the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produces yield point elongation, and making needs the external world to provide larger stress just can start dislocation.
Restriction technical scheme of the present invention is:
Further, aforesaid high-strength steel tension rod alloy material, its weight percent composition is: carbon: 0.30%, silicon: 0.10%, manganese: 0.40%, chromium: 0.80%, nickel: 3.50%, molybdenum: 0.50%, phosphorus: 0.01%, sulphur: 0.01%, hydrogen: 1.0ppm, vanadium: 0.10%, titanium: 0.010%, copper: 0.10%, aluminium: 0.02%, rare earth: 0.12%, trace impurity: 0.20%, all the other are Fe;
In rare earth, comprise following component by weight percentage: Eu:5.3%, Pr:12.4%, Dy:3.6%, Ac:7.6%, Nd:5.8%, Sm:11.5%, Ce:15.3%, Lu:13%, surplus is La.
Aforesaid high-strength steel tension rod alloy material, its weight percent composition is: carbon: 0.35%, silicon: 0.30%, manganese: 0.90%, chromium: 1.20%, nickel: 4.00%, molybdenum: 0.60%, phosphorus: 0.015%, sulphur: 0.015%, hydrogen: 2.0ppm, vanadium: 0.20%, titanium: 0.020%, copper: 0.20%, aluminium: 0.05%, rare earth: 0.15%, trace impurity: 0.50%, all the other are Fe;
In rare earth, comprise following component by weight percentage: Eu:5.4%, Pr:12.5%, Dy:3.7%, Ac:7.8%, Nd:0%, Sm:11.6%, Ce:15.4%, Lu:14%, surplus is La.
The present invention have also been devised a kind for the treatment of process of high-strength steel tension rod alloy material, comprises the steps:
Step (1): in arc furnace smelting procedure, adds alloy material after first furnace temperature being risen to 450-550 DEG C, is then heated to 1400-1450 DEG C, insulation 1-2h;
Step (2): LF stove refining, refining temperature is 1700-1720 DEG C, and composition is finely tuned, and the time is at 2-3h, omnidistance nitrogen blowing stirs, and makes Chemical Composition reach component requirements, carries out degassed with vacuum degassing furnace, degassing temperature is 1520 ~ 1530 DEG C, vacuum tightness 48-50 handkerchief, and pumpdown time is at 4-6h;
Smelt in the refining of LF stove, ensure that the quality of smelting, and carry out degassed at vacuum degassing furnace, use argon shield die casting, avoid in product and produce pore, the quality of further raising product, carries out twice thermal treatment by the blank forged, and significantly improves erosion resistance and the wear resistance of valve, improve the work-ing life of product, reduce costs, and at the surface spraying graphite grinding of valve part, increase wear resistance and the intensity on its surface;
Step (3): adopt after going out process furnace water-cooled with the rate of cooling of 23-25 DEG C/s by water-cooled to 925-935 DEG C, then quench with water or hardening liquid in quenching device, after being then heated to 620-640 DEG C in tempering process furnace, be cooled to normal temperature by the first process for cooling;
Step (4): preliminary hot rolling, preliminary hot-rolled temperature is 1220-1250 DEG C, room temperature is cooled to by the second process for cooling after preliminary hot rolling completes, then backheat to 1150 DEG C carry out second heat and roll, it is 850 DEG C that second heat rolls into temperature, carries out water-cooled/air cooling secondary circulation martemper process after secondary hot rolling to it;
Step (5): use high pressure spray jetting or hardening liquid to be cooled to 150-200 DEG C with the speed of 13-15 DEG C/s, insulation 5-8h, then the air-cooled speed with 20-25 DEG C/s is cooled to room temperature, last clean surface.
The treatment process of aforesaid high-strength steel tension rod alloy material, be first incubated 30-45min after being tempered to 620-640 DEG C in step (3), the first process for cooling is specially: be cooled to room temperature by water-cooled with the speed of 12-15 DEG C/s;
In step (4), the second process for cooling is specially: be cooled to room temperature with oil cooling with the speed of 13-15 DEG C/s.
The treatment process of aforesaid high-strength steel tension rod alloy material, the time of step (4) hollow cold quenching is 1/2 of the water cooling time, and air cooling time is l/3 first time entering the water cooling time for the first time; After this entering the water cooling time in each circulation successively decreases by the 0.8-0.7 of previous circulation, and water outlet air cooling time increases progressively by the 1.5-2 of last circulation, enters in water-cooled process, carries out stir process to water, and wherein, the stirring flow velocity of water is more than or equal to 0.3 meter per second;
Water-cooled/air cooling martemper technique is utilized to carry out in the process of Tempering and Quenching, the water temperature of quenching during beginning is lower than 36 DEG C, by three the circular gap quenchings of water-cooled/air cooling, prevent hardening break and implosion to greatest extent, also obtain even tiny quenching simultaneously, reduce quenching temperature and can effectively prevent reinforcing bar hardening crack to be inclined to;
Carbide can be made fully to dissolve further simultaneously, even diffusion, avoiding carbide causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, ensure that the ferrite content of material is about 35%, material solid solution can be made further abundant, avoid heat treatment mode heating uneven, the erosion rate that solid solution inequality is brought exceeds standard and hardness exceeds standard, and has consolidated the technique effect smelted postheat treatment technique above and produce.
Embodiment
embodiment 1
Present embodiments provide a kind of high-strength steel tension rod alloy material, its weight percent composition is: carbon: 0.30%, silicon: 0.10%, manganese: 0.40%, chromium: 0.80%, nickel: 3.50%, molybdenum: 0.50%, phosphorus: 0.01%, sulphur: 0.01%, hydrogen: 1.0ppm, vanadium: 0.10%, titanium: 0.010%, copper: 0.10%, aluminium: 0.02%, rare earth: 0.12%, trace impurity: 0.20%, all the other are Fe;
In rare earth, comprise following component by weight percentage: Eu:5.3%, Pr:12.4%, Dy:3.6%, Ac:7.6%, Nd:5.8%, Sm:11.5%, Ce:15.3%, Lu:13%, surplus is La;
In the present embodiment, the treatment process of high-strength steel tension rod alloy material is specially:
Step (1): in arc furnace smelting procedure, adds alloy material after first furnace temperature being risen to 450-550 DEG C, is then heated to 1400-1450 DEG C, insulation 1-2h;
Step (2): LF stove refining, refining temperature is 1700-1720 DEG C, and composition is finely tuned, and the time is at 2-3h, omnidistance nitrogen blowing stirs, and makes Chemical Composition reach component requirements, carries out degassed with vacuum degassing furnace, degassing temperature is 1520 ~ 1530 DEG C, vacuum tightness 48-50 handkerchief, and pumpdown time is at 4-6h;
Smelt in the refining of LF stove, ensure that the quality of smelting, and carry out degassed at vacuum degassing furnace, use argon shield die casting, avoid in product and produce pore, the quality of further raising product, carries out twice thermal treatment by the blank forged, and significantly improves erosion resistance and the wear resistance of valve, improve the work-ing life of product, reduce costs, and at the surface spraying graphite grinding of valve part, increase wear resistance and the intensity on its surface;
Step (3): adopt after going out process furnace water-cooled with the rate of cooling of 23-25 DEG C/s by water-cooled to 925-935 DEG C, then quench with water or hardening liquid in quenching device, by being cooled to room temperature by water-cooled with the speed of 12-15 DEG C/s after being then heated to 620-640 DEG C in tempering process furnace;
Step (4): preliminary hot rolling, preliminary hot-rolled temperature is 1220-1250 DEG C, by being cooled to room temperature with oil cooling with the speed of 13-15 DEG C/s after preliminary hot rolling completes, then backheat to 1150 DEG C carry out second heat and roll, it is 850 DEG C that second heat rolls into temperature, carries out water-cooled/air cooling secondary circulation martemper process after secondary hot rolling to it;
Step (5): use high pressure spray jetting or hardening liquid to be cooled to 150-200 DEG C with the speed of 13-15 DEG C/s, insulation 5-8h, then the air-cooled speed with 20-25 DEG C/s is cooled to room temperature, last clean surface.
embodiment 2
Present embodiments provide a kind of high-strength steel tension rod alloy material, its weight percent composition is: carbon: 0.35%, silicon: 0.30%, manganese: 0.90%, chromium: 1.20%, nickel: 4.00%, molybdenum: 0.60%, phosphorus: 0.015%, sulphur: 0.015%, hydrogen: 2.0ppm, vanadium: 0.20%, titanium: 0.020%, copper: 0.20%, aluminium: 0.05%, rare earth: 0.15%, trace impurity: 0.50%, all the other are Fe;
In rare earth, comprise following component by weight percentage: Eu:5.4%, Pr:12.5%, Dy:3.7%, Ac:7.8%, Nd:0%, Sm:11.6%, Ce:15.4%, Lu:14%, surplus is La;
In the present embodiment, the treatment process of high-strength steel tension rod alloy material is specially:
Step (1): in arc furnace smelting procedure, adds alloy material after first furnace temperature being risen to 450-550 DEG C, is then heated to 1400-1450 DEG C, insulation 1-2h;
Step (2): LF stove refining, refining temperature is 1700-1720 DEG C, and composition is finely tuned, and the time is at 2-3h, omnidistance nitrogen blowing stirs, and makes Chemical Composition reach component requirements, carries out degassed with vacuum degassing furnace, degassing temperature is 1520 ~ 1530 DEG C, vacuum tightness 48-50 handkerchief, and pumpdown time is at 4-6h;
Smelt in the refining of LF stove, ensure that the quality of smelting, and carry out degassed at vacuum degassing furnace, use argon shield die casting, avoid in product and produce pore, the quality of further raising product, carries out twice thermal treatment by the blank forged, and significantly improves erosion resistance and the wear resistance of valve, improve the work-ing life of product, reduce costs, and at the surface spraying graphite grinding of valve part, increase wear resistance and the intensity on its surface;
Step (3): adopt after going out process furnace water-cooled with the rate of cooling of 23-25 DEG C/s by water-cooled to 925-935 DEG C, then quench with water or hardening liquid in quenching device, by being cooled to room temperature by water-cooled with the speed of 12-15 DEG C/s after being then heated to 620-640 DEG C in tempering process furnace;
Step (4): preliminary hot rolling, preliminary hot-rolled temperature is 1220-1250 DEG C, by being cooled to room temperature with oil cooling with the speed of 13-15 DEG C/s after preliminary hot rolling completes, then backheat to 1150 DEG C carry out second heat and roll, it is 850 DEG C that second heat rolls into temperature, carry out water-cooled/air cooling secondary circulation martemper process to it after secondary hot rolling, the time of dry quenching is 1/2 of the water cooling time, and air cooling time is l/3 first time entering the water cooling time for the first time; After this entering the water cooling time in each circulation successively decreases by the 0.8-0.7 of previous circulation, and water outlet air cooling time increases progressively by the 1.5-2 of last circulation, enters in water-cooled process, carries out stir process to water, and wherein, the stirring flow velocity of water is more than or equal to 0.3 meter per second;
Step (5): use high pressure spray jetting or hardening liquid to be cooled to 150-200 DEG C with the speed of 13-15 DEG C/s, insulation 5-8h, then the air-cooled speed with 20-25 DEG C/s is cooled to room temperature, last clean surface.
These are only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a high-strength steel tension rod alloy material, it is characterized in that, its weight percent composition is: carbon: 0.30%-0.35%, silicon: 0-0.30%, manganese: 0-0.90%, chromium: 0.80%-1.20%, nickel: 3.50%-4.00%, molybdenum: 0.50%-0.60%, phosphorus: 0-0.015%, sulphur: 0-0.015%, hydrogen: 0-2.0ppm, vanadium: 0.10%-0.20%, titanium: 0-0.020%, copper: 0-0.20%, aluminium: 0-0.05%, rare earth: 0.12-0.15%, trace impurity: 0-0.50%, all the other are Fe;
In described rare earth, comprise following component by weight percentage: Eu:5.3-5.5%, Pr:12.4-12.6%, Dy:3.6-3.9%, Ac:7.6-7.8%, Nd:5.8-6.0%, Sm:11.5-11.8%, Ce:15.3-15.5%, Lu:13-15%, surplus is La.
2. high-strength steel tension rod alloy material according to claim 1, it is characterized in that, its weight percent composition is: carbon: 0.30%, silicon: 0.10%, manganese: 0.40%, chromium: 0.80%, nickel: 3.50%, molybdenum: 0.50%, phosphorus: 0.01%, sulphur: 0.01%, hydrogen: 1.0ppm, vanadium: 0.10%, titanium: 0.010%, copper: 0.10%, aluminium: 0.02%, rare earth: 0.12%, trace impurity: 0.20%, all the other are Fe;
In described rare earth, comprise following component by weight percentage: Eu:5.3%, Pr:12.4%, Dy:3.6%, Ac:7.6%, Nd:5.8%, Sm:11.5%, Ce:15.3%, Lu:13%, surplus is La.
3. high-strength steel tension rod alloy material according to claim 1, it is characterized in that, its weight percent composition is: carbon: 0.35%, silicon: 0.30%, manganese: 0.90%, chromium: 1.20%, nickel: 4.00%, molybdenum: 0.60%, phosphorus: 0.015%, sulphur: 0.015%, hydrogen: 2.0ppm, vanadium: 0.20%, titanium: 0.020%, copper: 0.20%, aluminium: 0.05%, rare earth: 0.15%, trace impurity: 0.50%, all the other are Fe;
In described rare earth, comprise following component by weight percentage: Eu:5.4%, Pr:12.5%, Dy:3.7%, Ac:7.8%, Nd:0%, Sm:11.6%, Ce:15.4%, Lu:14%, surplus is La.
4. a treatment process for high-strength steel tension rod alloy material, is characterized in that, comprises the steps:
Step (1): in arc furnace smelting procedure, adds alloy material after first furnace temperature being risen to 450-550 DEG C, is then heated to 1400-1450 DEG C, insulation 1-2h;
Step (2): LF stove refining, refining temperature is 1700-1720 DEG C, and composition is finely tuned, and the time is at 2-3h, omnidistance nitrogen blowing stirs, and makes Chemical Composition reach component requirements, carries out degassed with vacuum degassing furnace, degassing temperature is 1520 ~ 1530 DEG C, vacuum tightness 48-50 handkerchief, and pumpdown time is at 4-6h;
Step (3): adopt after going out process furnace water-cooled with the rate of cooling of 23-25 DEG C/s by water-cooled to 925-935 DEG C, then quench with water or hardening liquid in quenching device, after being then heated to 620-640 DEG C in tempering process furnace, be cooled to normal temperature by the first process for cooling;
Step (4): preliminary hot rolling, described preliminary hot-rolled temperature is 1220-1250 DEG C, room temperature is cooled to by the second process for cooling after preliminary hot rolling completes, then backheat to 1150 DEG C carry out second heat and roll, it is 850 DEG C that described second heat rolls into temperature, carries out water-cooled/air cooling secondary circulation martemper process after secondary hot rolling to it;
Step (5): use high pressure spray jetting or hardening liquid to be cooled to 150-200 DEG C with the speed of 13-15 DEG C/s, insulation 5-8h, then the air-cooled speed with 20-25 DEG C/s is cooled to room temperature, last clean surface.
5. the treatment process of high-strength steel tension rod alloy material according to claim 4, is characterized in that,
First be incubated 30-45min after being tempered to 620-640 DEG C in step (3), described first process for cooling is specially: be cooled to room temperature by water-cooled with the speed of 12-15 DEG C/s;
In step (4), the second process for cooling is specially: be cooled to room temperature with oil cooling with the speed of 13-15 DEG C/s.
6. the treatment process of high-strength steel tension rod alloy material according to claim 4, is characterized in that,
The time of step (4) hollow cold quenching is 1/2 of the water cooling time, and air cooling time is l/3 first time entering the water cooling time for the first time; After this entering the water cooling time in each circulation successively decreases by the 0.8-0.7 of previous circulation, water outlet air cooling time increases progressively by the 1.5-2 of last circulation, described in enter in water-cooled process, stir process is carried out to water, wherein, the stirring flow velocity of water is more than or equal to 0.3 meter per second.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694852A (en) * | 2015-03-20 | 2015-06-10 | 苏州科胜仓储物流设备有限公司 | High-strength steel plate for light goods shelves and forging process thereof |
| CN106653154A (en) * | 2016-12-23 | 2017-05-10 | 安徽天元电缆有限公司 | High-strength aluminum-clad steel wire and production method thereof |
| CN108034887A (en) * | 2017-12-01 | 2018-05-15 | 宁波诚泰汽车部件有限公司 | A kind of high performance alloys Steel material and preparation method thereof |
| CN114672724A (en) * | 2022-02-21 | 2022-06-28 | 长沙东鑫环保材料有限责任公司 | A kind of rare earth and nitrogen microalloyed molybdenum-containing HRB500E coiled steel bar and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694852A (en) * | 2015-03-20 | 2015-06-10 | 苏州科胜仓储物流设备有限公司 | High-strength steel plate for light goods shelves and forging process thereof |
| CN106653154A (en) * | 2016-12-23 | 2017-05-10 | 安徽天元电缆有限公司 | High-strength aluminum-clad steel wire and production method thereof |
| CN108034887A (en) * | 2017-12-01 | 2018-05-15 | 宁波诚泰汽车部件有限公司 | A kind of high performance alloys Steel material and preparation method thereof |
| CN114672724A (en) * | 2022-02-21 | 2022-06-28 | 长沙东鑫环保材料有限责任公司 | A kind of rare earth and nitrogen microalloyed molybdenum-containing HRB500E coiled steel bar and production method thereof |
| CN114672724B (en) * | 2022-02-21 | 2023-03-10 | 长沙东鑫环保材料有限责任公司 | A kind of rare earth and nitrogen micro-alloyed molybdenum-containing HRB500E spiral steel bar and its production method |
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Application publication date: 20150121 |