CN114147083A - Preparation method of steel strand for prestressed concrete - Google Patents
Preparation method of steel strand for prestressed concrete Download PDFInfo
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- CN114147083A CN114147083A CN202111461776.XA CN202111461776A CN114147083A CN 114147083 A CN114147083 A CN 114147083A CN 202111461776 A CN202111461776 A CN 202111461776A CN 114147083 A CN114147083 A CN 114147083A
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- Prior art keywords
- steel strand
- preparation
- steel
- wire
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- 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
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
Abstract
The invention provides a preparation method of a steel strand for prestressed concrete, which comprises the following steps: A) pickling the metal raw material, and then carrying out phosphating treatment; B) drawing the metal raw material obtained in the step A) for a plurality of passes to obtain a semi-finished steel wire; C) stranding the semi-finished steel wire, and then installing a drawing die at the joint of the stranded wire for drawing; D) stabilizing the steel wire obtained in the step C). The application provides a preparation method of a steel strand, which is characterized in that after the strand is stranded, a die pull is added to deform steel wires in the steel strand, and finally the cross section density and strength of the steel strand are improved.
Description
Technical Field
The invention relates to the technical field of steel strands, in particular to a preparation method of a steel strand for prestressed concrete.
Background
The steel strand is twisted by several steel wires, so that the strength of the steel strand and the flexibility of the steel strand can be increased, but a certain gap is left between the steel wires in the method. The density of the cross-sectional area of the steel strand is not too high, and is only about 77%.
When constructing a steel strand for prestressed concrete, under the condition of not good working conditions, it is desirable that the preformed hole of the steel strand is smaller and the tensile force of the steel strand with the same diameter is larger. Therefore, under the traditional manufacturing method of the steel strand, part of the manufacturing process needs to be changed, and the density of the cross-sectional area of the steel strand needs to be increased.
Disclosure of Invention
The invention aims to provide a preparation method of a steel strand, which can be used for preparing the steel strand with high strength and large cross section density.
In view of the above, the present application provides a method for preparing a steel strand for prestressed concrete, comprising the following steps:
A) pickling the metal raw material, and then carrying out phosphating treatment;
B) drawing the metal raw material obtained in the step A) for a plurality of passes to obtain a semi-finished steel wire;
C) stranding the semi-finished steel wire, and then installing a drawing die at the joint of the stranded wire for drawing;
D) stabilizing the steel wire obtained in the step C).
Preferably, the metal raw material is 82Mn high-wire rod, the tensile strength is 1200-1300 MPa, the elongation is more than or equal to 12%, and the reduction of area is more than or equal to 25%.
Preferably, the pickling is performed by using sulfuric acid, the concentration of the sulfuric acid is 40-100 g/L, the pickling temperature is 50-80 ℃, and the pickling time is 500-800 s.
Preferably, the total acidity of the phosphorization is 65-80 g/L, the free acidity is 8-10 g/L, and the temperature is 50-100 ℃.
Preferably, the lay length of the stranded wire is 250-300 mm, and the speed is 30-60 m/min.
Preferably, the diameter of the drawing die is 15-20 mm.
Preferably, the temperature of the stabilizing treatment is 350-400 ℃, and the tension is 150-200 KN.
Preferably, the stabilizing treatment is followed by a layer winding, and the diameter of the layer winding is not less than 750 mm.
Preferably, the drawing times are 8-10 times.
The application provides a preparation method of a prestressed concrete steel strand, which comprises the steps of firstly carrying out acid pickling on a metal raw material, then carrying out phosphating treatment to remove an oxide layer on the surface of the metal raw material, then drawing the metal raw material for a plurality of passes to obtain a semi-finished steel wire, then stranding the semi-finished steel wire, installing a drawing die at the folding position of the strand for drawing, and finally carrying out stabilization treatment to obtain the steel strand; in the process, after the stranded wire is pulled by the die, the steel wire in the steel stranded wire is deformed, and the density of the cross section is increased and the strength is higher under the condition that the total diameter of the steel stranded wire is not changed.
Drawings
Fig. 1 is a schematic cross-sectional view (left drawing) of a steel strand after die drawing according to the present invention and a schematic cross-sectional view (right drawing) of a general steel strand.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In view of the requirements of the cross-sectional area density and strength of the steel strand for prestressed concrete in the prior art, the application provides a preparation method of the steel strand for prestressed concrete, which has the characteristics of high strength and large cross-sectional density, and specifically, the embodiment of the invention discloses a preparation method of the steel strand for prestressed concrete, which comprises the following steps:
A) pickling the metal raw material, and then carrying out phosphating treatment;
B) drawing the metal raw material obtained in the step A) for a plurality of passes to obtain a semi-finished steel wire;
C) stranding the semi-finished steel wire, and then installing a drawing die at the joint of the stranded wire for drawing;
D) stabilizing the steel wire obtained in the step C).
In the process of preparing the steel strand, firstly, pickling is carried out on metal raw materials, and then phosphating treatment is carried out; the reagent adopted by the acid washing is sulfuric acid, the concentration of the sulfuric acid is 40-60%, the acid washing temperature is 50-80 ℃, and the acid washing time is 500-800 s; more specifically, the pickling temperature is 60-70 ℃, and the pickling time is 600-650 s. In the application, the metal raw material is specifically 82Mn high-wire rod, the tensile strength is 1200-1300 MPa, the elongation is more than or equal to 12%, and the reduction of area is more than or equal to 25%. The phosphating agent is zinc dihydrogen phosphate solution, the total acidity of the phosphating is 65-85 g/L, the free acidity is 8-10 g/L, and the temperature of the phosphating is 50-100 ℃; more specifically, the total acidity of the phosphating treatment is 65-76 g/L, the free acidity is 8-10 g/L, the acid ratio is 6-9, and the temperature of the phosphating treatment is 65-75 ℃.
After the pretreatment, drawing the obtained metal raw material for at least 8 times; the drawing is performed in a manner known to the person skilled in the art, in the present application the drawn central filament has a diameter larger than the diameter of the side filaments, for example in the example the central filament has a diameter of 6.60mm and the side filaments have a diameter of 6.38 mm.
After the semi-finished steel wire is obtained, stranding the semi-finished steel wire, and installing a drawing die at the joint of the stranded wire for drawing; in this process, the above process is a die drawing process, which can deform the steel wires in the steel strand, but the cross-sectional area is not changed, and the diameter of the steel strand becomes smaller, thereby increasing the cross-sectional density of the steel strand. The twisting distance of the twisted wire is 250-300 mm, the speed is 30-60 m/min, more specifically, the twisting distance of the twisted wire is 260-290 mm, and the speed is 40-50 m/min. The diameter of the drawing die is 15-20 mm.
The steel strand obtained by the method is finally subjected to stabilization treatment; the temperature of the stabilizing treatment is 350-400 ℃, and the tension is 150-200 KN; in a specific embodiment, the temperature of the stabilizing treatment is 370-390 ℃, and the tension is 160-190 KN. According to the invention, a layer winding is also included after the stabilization treatment, the diameter of the layer winding being not less than 750 mm.
The application provides a preparation method of a prestressed concrete steel strand, which comprises the steps of firstly carrying out acid pickling on a metal raw material, then carrying out phosphating treatment to remove an oxide layer on the surface of the metal raw material, then drawing the metal raw material for a plurality of passes to obtain a semi-finished steel wire, then stranding the semi-finished steel wire, installing a drawing die at the folding position of the strand for drawing, and finally carrying out stabilization treatment to obtain the steel strand; in the process, after the stranded wire is pulled by the die, the steel wire in the steel stranded wire is deformed, and the density of the cross section is increased and the strength is higher under the condition that the total diameter of the steel stranded wire is not changed. The tensile strength of the steel strand prepared by the method reaches more than 1700MPa, and the density of the cross-sectional area reaches more than 87.8%.
For further understanding of the present invention, the following examples are provided to illustrate the preparation method of the steel strand for prestressed concrete according to the present invention, and the scope of the present invention is not limited by the following examples.
Examples
Raw materials: xiang steel products
Raw materials, namely 82Mn high-wire rod, with the tensile strength of 1250-1300 MPa, the elongation of more than or equal to 12 percent and the reduction of area of more than or equal to 25 percent;
the process comprises the following steps: acid washing, phosphorization, drawing, stranding (die drawing), stabilizing treatment and wire winding, which specifically comprises the following steps:
1) pickling the raw materials by using sulfuric acid, wherein the concentration of acid liquor is 40-60%, the ferrous content is less than or equal to 200g/L, the pickling temperature is 60-70 ℃, and the pickling time is as follows: 600s to 650 s;
2) phosphorization: total acidity: 65-76 g/L, free acidity: 8-10 g/L, acid ratio: 6-9, temperature: 65-75 ℃;
3) diameter of semi-finished steel wire: center wire: 6.60mm, side wire: 6.38mm, 8-pass dry wire drawing machines are used for drawing, and the drawing routes are respectively as follows: 13mm-11.98mm-10.72mm-9.59mm-8.58mm-7.67mm-6.95mm-6.38 mm; 13mm-11.98mm-10.72mm-9.59mm-8.58mm-7.67mm-6.95mm-6.60 mm;
4) stranding: lay length was set to 288mm, speed was set to: 50 m/min;
5) a drawing die with the diameter of 18mm is additionally arranged at the folding position of the twisted steel wire, and the diameter of the steel strand is controlled;
6) and (3) stabilizing treatment: the temperature is set to 385 plus or minus 5 ℃, and the tension is set to 170 KN;
7) layer winding: the diameter of the layer is not less than 750 mm.
Step 5) is omitted in the preparation method of the steel strand in the prior art, specifically as shown in fig. 1, the left drawing in fig. 1 is a schematic cross-sectional view of the steel strand in the prior art, and the right drawing is a schematic cross-sectional view of the steel strand in the application. Experimental results show that the tensile strength of the steel strand for the prestressed concrete prepared by the method reaches 1700MPa or more, and the density of the cross-sectional area reaches 87.8% or more.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A preparation method of a steel strand for prestressed concrete comprises the following steps:
A) pickling the metal raw material, and then carrying out phosphating treatment;
B) drawing the metal raw material obtained in the step A) for a plurality of passes to obtain a semi-finished steel wire;
C) stranding the semi-finished steel wire, and then installing a drawing die at the joint of the stranded wire for drawing;
D) stabilizing the steel wire obtained in the step C).
2. The preparation method of claim 1, wherein the metal raw material is 82Mn high-wire rod, the tensile strength is 1200-1300 MPa, the elongation is more than or equal to 12%, and the reduction of area is more than or equal to 25%.
3. The preparation method of claim 1, wherein the acid washing is performed by sulfuric acid, the concentration of the sulfuric acid is 40-100 g/L, the temperature of the acid washing is 50-80 ℃, and the time of the acid washing is 500-800 s.
4. The preparation method according to claim 1, wherein the total acidity of the phosphating is 65-80 g/L, the free acidity is 8-10 g/L, and the temperature is 50-100 ℃.
5. The method according to claim 1, wherein the strand has a lay length of 250 to 300mm and a speed of 30 to 60 m/min.
6. The method according to claim 1, wherein the diameter of the drawing die is 15 to 20 mm.
7. The method according to claim 1, wherein the temperature of the stabilizing treatment is 350 to 400 ℃ and the tension is 150 to 200 KN.
8. The method of claim 1, further comprising a layer winding after the stabilizing treatment, wherein the diameter of the layer winding is not less than 750 mm.
9. The method according to claim 1, wherein the number of times of drawing is 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111461776.XA CN114147083A (en) | 2021-12-02 | 2021-12-02 | Preparation method of steel strand for prestressed concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111461776.XA CN114147083A (en) | 2021-12-02 | 2021-12-02 | Preparation method of steel strand for prestressed concrete |
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| Publication Number | Publication Date |
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| CN114147083A true CN114147083A (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111461776.XA Pending CN114147083A (en) | 2021-12-02 | 2021-12-02 | Preparation method of steel strand for prestressed concrete |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469657A (en) * | 2013-08-19 | 2013-12-25 | 昆山乔锐金属制品有限公司 | Preparation method of die drawing steel strand |
| CN103669056A (en) * | 2013-12-30 | 2014-03-26 | 天津市津博发金属制品有限公司 | Die-drawing pre-stress steel strand production line |
| CN104741399A (en) * | 2015-04-07 | 2015-07-01 | 奥盛新材料股份有限公司 | Prestress steel strand manufacturing tool and steel strand manufacturing method |
| CN105312341A (en) * | 2015-12-02 | 2016-02-10 | 贵州钢绳股份有限公司 | Production process of high-strength pre-stressed steel strands |
-
2021
- 2021-12-02 CN CN202111461776.XA patent/CN114147083A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469657A (en) * | 2013-08-19 | 2013-12-25 | 昆山乔锐金属制品有限公司 | Preparation method of die drawing steel strand |
| CN103669056A (en) * | 2013-12-30 | 2014-03-26 | 天津市津博发金属制品有限公司 | Die-drawing pre-stress steel strand production line |
| CN104741399A (en) * | 2015-04-07 | 2015-07-01 | 奥盛新材料股份有限公司 | Prestress steel strand manufacturing tool and steel strand manufacturing method |
| CN105312341A (en) * | 2015-12-02 | 2016-02-10 | 贵州钢绳股份有限公司 | Production process of high-strength pre-stressed steel strands |
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