CN107217200A - A kind of deformed bar and its processing method - Google Patents

A kind of deformed bar and its processing method Download PDF

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Publication number
CN107217200A
CN107217200A CN201710479736.5A CN201710479736A CN107217200A CN 107217200 A CN107217200 A CN 107217200A CN 201710479736 A CN201710479736 A CN 201710479736A CN 107217200 A CN107217200 A CN 107217200A
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Prior art keywords
reinforcing bar
cooled
quenching
weight
deformed bar
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解正来
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Hefei Hui Xin Machinery Technology Co Ltd
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Hefei Hui Xin Machinery Technology Co Ltd
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Priority to CN201710479736.5A priority Critical patent/CN107217200A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/005Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20Ferrous alloys, e.g. steel alloys containing chromium with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

It is the invention provides a kind of parts by weight chemical constituent of deformed bar:Carbon 0.34 0.44%, silicon 0.42 0.52%, manganese 0.73 0.75%, chromium 0.70 0.74%, molybdenum 0.30 0.31%, tungsten 0.37 0.57%, copper≤0.21%, phosphorus≤0.026%, sulphur≤0.014%, lanthanide rare 0.13 0.15%, residual elements 0 0.03%, surplus is iron.The present invention uses special formula, reinforcing bar is had the basis of preferable mechanical characteristic.Present invention also offers the preparation method of above-mentioned deformed bar, on traditional " drawing tube reducing → indentation → quenching → tempering " Process ba- sis, strengthen in the control of temperature time protocols, cooling step especially after tempering, be used alternatingly with water cooling and air cooling mode.Intensity of the reinforcing bar finally processed itself has exceeded 2000MPa, and elongation percentage is more than 8%, and with preferable ductility and anti-delayed fracture characteristic.

Description

A kind of deformed bar and its processing method
Technical field
The present invention relates to metal material processing and field shaping technique, and in particular to a kind of deformed bar and its processing side Method.
Background technology
Deformed bar be it is a kind of efficiently, the novel building metal material of energy-conservation, develop and promote the use of and see earliest Century eight, the Japan of the nineties, it is using gren rod as raw material, using " drawing tube reducing → indentation → quenching → tempering " work Skill is produced, and product has high-strength tenacity, underrelaxation, good solderability, good upsetting, good concrete binding The features such as, it is widely used in the high pre-stress component of all kinds of architectural engineerings, such as:High-strength prestressed concrete centrifugation pile tube, In electric pole, overhead bridge pier, railroad sleeper high pre-stress component.Due to the raising of intensity and performance, can substantially reduce steel makes Consumption, improves steel service efficiency, is conducive to creating conservation-minded society.Market demand rising, steel with deformed bar Muscle production line increases, and the crudy of reinforcing bar increasingly becomes the restricted key link of the production of deformed bar, existing Deformed bar is caused some problems occur due to steel bar meter method in technology, such as reinforcing bar is during drawing tube reducing Frequently fracture, reinforced steel bar strength fluctuation is big, elongation is relatively low, and delayed fracture etc. occurs in use for reinforcing bar.
The content of the invention
In view of above-mentioned defect of the prior art, the technical problem to be solved in the present invention is to provide a kind of deformed bar Chemical constituent and its processing method, it is desirable to the deformed bar intensity that processes is high, and elongation percentage is high, and with good anti-stagnant Fracture characteristics afterwards.
In view of the above-mentioned technical problem to be solved, the present invention provides following technical solution:A kind of deformed bar, Include the chemical composition of following parts by weight:Carbon 0.34-0.44%, silicon 0.42-0.52%, manganese 0.73-0.75%, chromium 0.70-0.74%, Molybdenum 0.30-0.31%, tungsten 0.37-0.57%, copper≤0.21%, phosphorus≤0.026%, sulphur≤0.014%, lanthanide rare 0.13-0.15%, Residual elements 0-0.03%, surplus is iron.
It is preferred that, include the chemical composition of following parts by weight:Carbon 0.38%, silicon 0.45%, manganese 0.72%, chromium 0.73%, molybdenum 0.31%th, tungsten 0.45%, copper 0.15%, phosphorus 0.015%, sulphur 0.013%, lanthanide rare 0.13%, residual elements 0-0.03%, surplus is Iron.
It is preferred that, include the chemical composition of following parts by weight:Carbon 0.41%, silicon 0.43%, manganese 0.74%, chromium 0.72%, molybdenum 0.30%th, tungsten 0.50%, copper 0.13%, phosphorus 0.017%, sulphur 0.011%, lanthanide rare 0.14%, residual elements 0-0.03%, surplus is Iron.
It is preferred that, the lanthanide rare includes following parts by weight chemical composition:Lanthanum 16-20%, cerium 22-24%, praseodymium 24-27%, Neodymium 16-18%, dysprosium 13-16%, remaining lanthanide series 4-5%, lanthanide rare each component sum is 100%.
It is further preferred that the lanthanide rare includes following parts by weight chemical composition:Lanthanum 18%, cerium 23%, praseodymium 25%, neodymium 17%th, dysprosium 13%, remaining lanthanide series 4%.
It is further preferred that the lanthanide rare includes following parts by weight chemical composition:Lanthanum 17%, cerium 24%, praseodymium 24%, neodymium 16%th, dysprosium 14%, remaining lanthanide series 5%.
The present invention also provides a kind of method for processing above-mentioned deformed bar, comprises the following steps:
(1)Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
(2)The reinforcing bar rolled feeding induction heater is heated to 965-988 DEG C, heating-up temperature duration is kept 4-6 minutes;
(3)The reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 205-218 DEG C/s, quenching cool time position 10-27s, reinforcing bar temperature is cooled to below martensitic transformation initial temperature 13-23 DEG C;
(4)Reinforcing bar after quenching is heated to 525-575 DEG C by tempering, 10-20s is incubated;
(5)Reinforcing bar after tempering is cooled to room temperature, 357- is cooled to 2-3 DEG C/s cooling velocity with water-cooling method first 367 DEG C, then it is air-cooled to 283-303 DEG C, then with 2-3 DEG C/s cooling velocity 233-243 DEG C is cooled to water-cooling method, finally Room temperature is air-cooled to, deformed bar is obtained.
It is preferred that, comprise the following steps:
(1)Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
(2)The reinforcing bar rolled feeding induction heater is heated to 976 DEG C, heating-up temperature duration is kept 5 minutes;
(3)Reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 209 DEG C/ S, quenches cool time 17s, reinforcing bar temperature is cooled to below martensitic transformation initial temperature 17 DEG C;
(4)Reinforcing bar after quenching is heated to 545 DEG C by tempering, 15s is incubated;
(5)Reinforcing bar after tempering is cooled to room temperature:360 DEG C are cooled to 2.5 DEG C/s cooling velocity with water-cooling method first, Then it is air-cooled to 295 DEG C, then with 2.5 DEG C/s cooling velocity 240 DEG C is cooled to water-cooling method, is finally air-cooled to room temperature, obtains To deformed bar.
Compared with prior art, beneficial effects of the present invention are:The present invention uses special formula, has reinforcing bar preferable Mechanical characteristic basis;Plus processing technology of the present invention using strict control processing conditions, it is traditional " drawing tube reducing → On indentation → quenching → tempering " Process ba- sis, strengthen in the control of temperature time protocols, cooling step especially after tempering, It is used alternatingly with water cooling and air cooling mode.Intensity of the reinforcing bar finally processed itself has exceeded 2000MPa, and elongation percentage is more than 8%, and with preferable ductility and anti-delayed fracture characteristic, this reinforcing bar is applied in prestressed reinforced concrete component, The disconnected muscle rate of reinforcing bar can be substantially reduced during tension reinforcing steel bar, the service life of deformed bar is extended, saves cost.
Embodiment
With reference to specific embodiment, technical scheme is expanded on further.These embodiments are merely to illustrate this The optimal case of invention rather than limit the scope of the invention.
Embodiment 1,
A kind of deformed bar and its processing method, include the chemical composition of following parts by weight:Carbon 0.38%, silicon 0.45%, manganese 0.72%th, chromium 0.73%, molybdenum 0.31%, tungsten 0.45%, copper 0.15%, phosphorus 0.015%, sulphur 0.013%, lanthanide rare 0.13%, remaining member Plain 0-0.03%, surplus is iron.
Wherein lanthanide rare includes following parts by weight chemical composition:Lanthanum 18%, cerium 23%, praseodymium 25%, neodymium 17%, dysprosium 13%, remaining Lanthanide series 4%.
The above-mentioned pre- processing method for answering reinforcing bar, comprises the following steps:
(1)Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
(2)The reinforcing bar rolled feeding induction heater is heated to 965 DEG C, heating-up temperature duration is kept 6 minutes;
(3)Reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 205 DEG C/ S, quenching cool time position 10s, makes reinforcing bar temperature be cooled to below martensitic transformation initial temperature 13 DEG C;
(4)Reinforcing bar after quenching is heated to 525 DEG C by tempering, 10s is incubated;
(5)Reinforcing bar after tempering is cooled to room temperature:357 DEG C are cooled to 2 DEG C/s cooling velocity with water-cooling method first, so After be air-cooled to 283 DEG C, then with 2 DEG C/s cooling velocity be cooled to 233 DEG C with water-cooling method, be finally air-cooled to room temperature, obtain pre- Stress reinforcing bar.
Embodiment 2,
A kind of deformed bar, includes the chemical composition of following parts by weight:Carbon 0.41%, silicon 0.43%, manganese 0.74%, chromium 0.72%, Molybdenum 0.30%, tungsten 0.50%, copper 0.13%, phosphorus 0.017%, sulphur 0.011%, lanthanide rare 0.14%, residual elements 0-0.03%, surplus For iron.
Wherein lanthanide rare includes following parts by weight chemical composition:Lanthanide rare includes following parts by weight chemical composition:Lanthanum 17%th, cerium 24%, praseodymium 24%, neodymium 16%, dysprosium 14%, remaining lanthanide series 5%.
The above-mentioned pre- processing method for answering reinforcing bar, comprises the following steps:
(1)Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
(2)The reinforcing bar rolled feeding induction heater is heated to 988 DEG C, heating-up temperature duration is kept 4 minutes;
(3)Reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 218 DEG C/ S, quenching cool time position 27s, makes reinforcing bar temperature be cooled to below martensitic transformation initial temperature 23 DEG C;
(4)Reinforcing bar after quenching is heated to 575 DEG C by tempering, 20s is incubated;
(5)Reinforcing bar after tempering is cooled to room temperature:367 DEG C are cooled to 3 DEG C/s cooling velocity with water-cooling method first, so After be air-cooled to 303 DEG C, then with 3 DEG C/s cooling velocity be cooled to 243 DEG C with water-cooling method, be finally air-cooled to room temperature, obtain pre- Stress reinforcing bar.
Embodiment 3,
A kind of deformed bar, includes the chemical composition of following parts by weight:Carbon 0.34%, silicon 0.42%, manganese 0.73%, chromium 0.70%, Molybdenum 0.30%, tungsten 0.37%, copper 0.21%, phosphorus 0.026%, sulphur 0.014%, lanthanide rare 0.13%, residual elements 0-0.03%, surplus For iron.
Wherein lanthanide rare includes following parts by weight chemical composition:Lanthanum 16%, cerium 24%, praseodymium 25%, neodymium 16%, dysprosium 15%, remaining Lanthanide series 4%.
The above-mentioned pre- processing method for answering reinforcing bar, comprises the following steps:
(1)Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
(2)The reinforcing bar rolled feeding induction heater is heated to 976 DEG C, heating-up temperature duration is kept 5 minutes;
(3)Reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 209 DEG C/ S, quenches cool time 17s, reinforcing bar temperature is cooled to below martensitic transformation initial temperature 17 DEG C;
(4)Reinforcing bar after quenching is heated to 545 DEG C by tempering, 15s is incubated;
(5)Reinforcing bar after tempering is cooled to room temperature:360 DEG C are cooled to 2.5 DEG C/s cooling velocity with water-cooling method first, Then it is air-cooled to 295 DEG C, then with 2.5 DEG C/s cooling velocity 240 DEG C is cooled to water-cooling method, is finally air-cooled to room temperature, obtains To deformed bar.
Embodiment 4,
A kind of deformed bar, includes the chemical composition of following parts by weight:Carbon 0.44%, silicon 0.52%, manganese 0.75%, chromium 0.74%, Molybdenum 0.31%, tungsten 0.57%, copper 0.15%, phosphorus 0.015%, sulphur≤0.011%, lanthanide rare 0.15%, residual elements 0-0.03%, it is remaining Measure as iron.
Wherein lanthanide rare includes following parts by weight chemical composition:Lanthanum 20%, cerium 22%, praseodymium 24%, neodymium 16%, dysprosium 13%, remaining Lanthanide series 5%, lanthanide rare each component sum is 100%.
The above-mentioned pre- processing method for answering reinforcing bar, comprises the following steps:
(1)Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
(2)The reinforcing bar rolled feeding induction heater is heated to 972 DEG C, heating-up temperature duration is kept 5 minutes;
(3)Reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 212 DEG C/ S, quenching cool time position 22s, makes reinforcing bar temperature be cooled to below martensitic transformation initial temperature 21 DEG C;
(4)Reinforcing bar after quenching is heated to 540 DEG C by tempering, 16s is incubated;
(5)Reinforcing bar after tempering is cooled to room temperature, 360 DEG C are cooled to water-cooling method with 2 DEG C/s cooling velocity first, so After be air-cooled to 294 DEG C, then with 2 DEG C/s cooling velocity be cooled to 240 DEG C with water-cooling method, be finally air-cooled to room temperature, obtain pre- Stress reinforcing bar.
Deformed bar prepared by above-described embodiment carries out Experiments of Machanics, and wherein contrast experiment's example is to use existing processing The deformed bar that technique makes.Experimental result is as follows:
Test result indicates that, the deformed bar of processing and fabricating of the present invention is compared with the deformed bar of prior art, in resistance to compression There are obvious advantage, especially embodiment 1 and the pre- of the making in embodiment 2 should in the disconnected muscle rate of intensity, elongation percentage and tensioning The advantage of power reinforcing bar is more obvious, therefore embodiment 1 and the chemical composition of the deformed bar in embodiment 2 are with when processing work Skill is than more preferably scheme.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality Apply example the present invention is described in detail, for those skilled in the art, it still can be to previous embodiment Described technical scheme is modified, or carries out equivalent substitution to which part technical characteristic.All spirit in the present invention Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.

Claims (8)

1. a kind of deformed bar, it is characterised in that:Include the chemical composition of following parts by weight:Carbon 0.34-0.44%, silicon 0.42- 0.52%th, manganese 0.73-0.75%, chromium 0.70-0.74%, molybdenum 0.30-0.31%, tungsten 0.37-0.57%, copper≤0.21%, phosphorus≤ 0.026%th, sulphur≤0.014%, lanthanide rare 0.13-0.15%, residual elements 0-0.03%, surplus is iron.
2. deformed bar according to claim 1, it is characterised in that:Include the chemical composition of following parts by weight:Carbon 0.38%th, silicon 0.45%, manganese 0.72%, chromium 0.73%, molybdenum 0.31%, tungsten 0.45%, copper 0.15%, phosphorus 0.015%, sulphur 0.013%, group of the lanthanides Rare earth 0.13%, residual elements 0-0.03%, surplus is iron.
3. deformed bar according to claim 1, it is characterised in that:Include the chemical composition of following parts by weight:Carbon 0.41%th, silicon 0.43%, manganese 0.74%, chromium 0.72%, molybdenum 0.30%, tungsten 0.50%, copper 0.13%, phosphorus 0.017%, sulphur 0.011%, group of the lanthanides Rare earth 0.14%, residual elements 0-0.03%, surplus is iron.
4. deformed bar according to claim 1, it is characterised in that:The lanthanide rare includes following parts by weight chemistry Composition:Lanthanum 16-20%, cerium 22-24%, praseodymium 24-27%, neodymium 16-18%, dysprosium 13-16%, remaining lanthanide series 4-5%, lanthanide rare are each Component sum is 100%.
5. deformed bar according to claim 3, it is characterised in that:The lanthanide rare includes following parts by weight chemistry Composition:Lanthanum 18%, cerium 23%, praseodymium 25%, neodymium 17%, dysprosium 13%, remaining lanthanide series 4%.
6. deformed bar according to claim 3, it is characterised in that:The lanthanide rare includes following parts by weight chemistry Composition:Lanthanum 17%, cerium 24%, praseodymium 24%, neodymium 16%, dysprosium 14%, remaining lanthanide series 5%.
7. a kind of processing method of deformed bar as any one of claim 1 to 6, it is characterised in that:Including such as Lower step:
Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
The reinforcing bar rolled feeding induction heater is heated to 965-988 DEG C, heating-up temperature duration is kept 4-6 minutes;
Reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 205-218 DEG C/ S, quenching cool time position 10-27s, makes reinforcing bar temperature be cooled to below martensitic transformation initial temperature 13-23 DEG C;
Reinforcing bar after quenching is heated to 525-575 DEG C by tempering, 10-20s is incubated;
Reinforcing bar after tempering is cooled to room temperature:357-367 is cooled to 2-3 DEG C/s cooling velocity with water-cooling method first DEG C, then it is air-cooled to 283-303 DEG C, then with 2-3 DEG C/s cooling velocity 233-243 DEG C is cooled to water-cooling method, it is last empty It is cooled to room temperature, obtains deformed bar.
8. the method for processing deformed bar according to claim 7, it is characterised in that:Comprise the following steps:
Smelted according to percentage by weight in steel mill and roll into reinforcing bar;
The reinforcing bar rolled feeding induction heater is heated to 976 DEG C, heating-up temperature duration is kept 5 minutes;
The reinforcing bar that sensing heating is completed directly carries out Quenching Treatment with quenching liquid, and quenching cooling velocity control is 209 DEG C/s, is quenched Fiery cool time 17s, makes reinforcing bar temperature be cooled to below martensitic transformation initial temperature 17 DEG C;
Reinforcing bar after quenching is heated to 545 DEG C by tempering, 15s is incubated;
Reinforcing bar after tempering is cooled to room temperature:360 DEG C are cooled to 2.5 DEG C/s cooling velocity with water-cooling method first, so After be air-cooled to 295 DEG C, then with 2.5 DEG C/s cooling velocity be cooled to 240 DEG C with water-cooling method, be finally air-cooled to room temperature, obtain Deformed bar.
CN201710479736.5A 2017-06-22 2017-06-22 A kind of deformed bar and its processing method Withdrawn CN107217200A (en)

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CN201710479736.5A CN107217200A (en) 2017-06-22 2017-06-22 A kind of deformed bar and its processing method

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Application Number Priority Date Filing Date Title
CN201710479736.5A CN107217200A (en) 2017-06-22 2017-06-22 A kind of deformed bar and its processing method

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643125A (en) * 2013-11-21 2014-03-19 江苏天舜金属材料集团有限公司 Steel bar for prestress concrete, and production process thereof
CN106088479A (en) * 2016-08-16 2016-11-09 重庆市晟庄建材有限责任公司 A kind of processing method of prestressed high strength concrete steel reinforcement cage
CN106272953A (en) * 2016-08-16 2017-01-04 重庆市晟庄建材有限责任公司 A kind of processing method of prestressed concrete reinforcing steel stake

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643125A (en) * 2013-11-21 2014-03-19 江苏天舜金属材料集团有限公司 Steel bar for prestress concrete, and production process thereof
CN106088479A (en) * 2016-08-16 2016-11-09 重庆市晟庄建材有限责任公司 A kind of processing method of prestressed high strength concrete steel reinforcement cage
CN106272953A (en) * 2016-08-16 2017-01-04 重庆市晟庄建材有限责任公司 A kind of processing method of prestressed concrete reinforcing steel stake

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Application publication date: 20170929