CN105312341A - Production process of high-strength pre-stressed steel strands - Google Patents

Production process of high-strength pre-stressed steel strands Download PDF

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Publication number
CN105312341A
CN105312341A CN201510865701.6A CN201510865701A CN105312341A CN 105312341 A CN105312341 A CN 105312341A CN 201510865701 A CN201510865701 A CN 201510865701A CN 105312341 A CN105312341 A CN 105312341A
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China
Prior art keywords
wire
steel
steel strands
strand wires
steel strand
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Pending
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CN201510865701.6A
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Chinese (zh)
Inventor
张宗前
万小松
江渝
吴光虎
胡邮邮
王国平
张青
吴丽
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Guizhou Steel Rope Co Ltd
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Guizhou Steel Rope Co Ltd
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Priority to CN201510865701.6A priority Critical patent/CN105312341A/en
Publication of CN105312341A publication Critical patent/CN105312341A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
    • B21C1/04—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series
    • 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
    • B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
    • B21C43/02—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • 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
    • B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
    • B21C43/02—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • B21C43/04—Devices for de-scaling wire or like flexible work
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C23C22/73—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 characterised by the process
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Ropes Or Cables (AREA)

Abstract

The invention discloses a production process of high-strength pre-stressed steel strands. The produced steel strands are structurally characterized in that the steel strands are 1mm in length and 7mm in width; the diameter of the steel strands is 15.20mm; the tensile strength of the steel strands is 2000MPa; the steel strands are produced by 82B coil rod high-carbon wires with diameter phi being 14mm which serve as the raw materials; the coil rods are pickled for 420 seconds by hydrochloric acid to carry out phosphorization; the maximum speed of drawing finished coils is 4m/s; the maximum part compression ratio and the absolute deformation cannot occur in the same pass during drawing; the stabilization treatment tension of the steel strands is 44-47% of the breakage tension of the steel strands; the tempering temperature is 385+/-5 DEG C; the strength loss of the steel strands remains 1.5-3.5% so as to ensure that the steel strands obtain high relaxation resistance; the high strength loss is avoided.

Description

A kind of high-strength prestress cable production line technique
Technical field
The present invention relates to a kind of high-strength prestress cable production line technique, belong to metallic article production and processing technical field.
Background technology
Domestic production 1 × 7-15.20-1860MPa steel strand wires technology is ripe, and steel strand wires diameter is 15.28-15.36mm, and the auxiliary facilities such as steel strand anchorage specifications and models form specification.The prestress wire of existing domestic demands more high strength, better toughness, lower loose rate, to meet the needs of highway, railway and bridge engineering construction, particularly 2000MPa grade high-strength prestress wire is in great demand, but current domestic 2000MPa grade high-strength prestress wire production technology is immature, production product strength is low, poor toughness, loose rate is large, can not meet market demand.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of high-strength prestress cable production line technique is provided, solve the deficiency of pre existing prestress steel strand production technology, meet the demand of market to 2000MPa grade high-strength prestress wire.
High-strength prestress steel strand wires of the present invention, structure is 1 × 7, and diameter is 15.20mm, and tensile strength is 2000MPa.Production technology is as follows:
(1) raw material is selected
Adopt diameter phi 14mm, 82B wire rod high-carbon wire rod, wire rod chemical composition is: C:0.82-0.84%, S≤0.025%, P≤0.0255%, Si:0.15-0.3%, Mn:0.6-0.9%, Cr:0.22-0.30%, V:0.05-0.1%, wire rod tensile strength 1200-1250MPa, contraction percentage of area > 30%;
(2) wire rod surface treatment
1) wire rod adopts chlorohydric acid pickling, pickling time 420s, simultaneously in order to reduce the corrosion of acid solution to base steel, promotes pickling effect, and when environment temperature 25 DEG C, corrosion inhibiter and hydrochloric acid add than being 0.012-0.015; Chlorohydric acid pickling adopts five descaling bath pickling, and each groove technological parameter is as follows:
2) wire rod phosphatization
Phosphating process parameters is as follows:
Promote phosphoric acid total acidity in parkerizing process to 48-53 point, improve speed and the quality of phosphorization filming with position, guarantee that phosphatization face quality reaches 9-10g/mm 2left and right, phosphatization smooth surface, densification;
(3) steel wire drawing
1) drawn steel wire diameter 5.05mm, drawing total draught 86%, the absolute deformation amount between wire rod and finished product steel wire is 8.95mm;
2) for making steel wire obtain high strength and good plasticity and toughness, adopt 11/1270 straight drawing machine to carry out drawing, drawing passes is 11 passages, and 1,4,8,11 passage diaphragm capsules adopt molding boxes, final capstan maximum speed 4m/s;
3) drawing process is as follows:
In drawing process, largest portion compression ratio, absolute deformation amount can not appear at same a time;
4) on reel, wire temperature controls: the wire temperature controlled on first, second volume reel must not more than 100 DEG C, on all the other reels, wire temperature must not more than 130 DEG C, because of when producing large gauge, high tensile steel wire, because deflection is comparatively large and be out of shape under DRY SLIDING, temperature rise phenomenon is serious, and higher temperature reduces making the plasticity of steel wire;
5) drawn steel wire mechanical property
Tensile strength 2050-2250MPa, torsion >=20 time, bending >=12;
(4) steel strand wires twisting and stabilization processes
1) steel strand wires twisting cover wire diameter is 5.05mm, and steel wire of internal layer diameter is 5.26mm, and twisting steel strand wires diameter is 15.40-15.34mm, lay pitch 230mm, and after steel strand wires tempering stabilization processes, diameter is 15.36-15.30mm;
2) steel strand wires stabilization processes tension force is the 44-47% of the disrumpent feelings tension force of steel strand wires, and stabilization processes temperature is 385 ± 5 DEG C, and steel strand wires loss of strength remains between 1.5-3.5%, guarantees that steel strand wires obtain good relaxation property, avoids large loss of strength;
(5) steel strand wires mechanical property
Tensile strength 2015-2110MPa, rupture pull force 282-295kN, yield force 247-253kN, percentage elongation 4-5.5%, relaxation rate 1.6%.
The beneficial effect of employing technique scheme is: steel strand wires tensile strength is high, and tensile strength reaches 2000MPa, and relaxation rate is low, good toughness, and steel strand surface quality is good.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail:
To produce strand structure for 1 × 7, diameter is 15.20mm, and tensile strength is 2000MPa is example:
(1) raw material is selected
Adopt diameter phi 14mm, 82B wire rod high-carbon wire rod, wire rod chemical composition is: C:0.82-0.84%, S≤0.025%, P≤0.0255%, Si:0.15-0.3%, Mn:0.6-0.9%, Cr:0.22-0.30%, V:0.05-0.1%, wire rod tensile strength 1200-1250MPa, contraction percentage of area > 30%;
(2) wire rod surface treatment
1) wire rod adopts chlorohydric acid pickling, pickling time 420s, simultaneously in order to reduce the corrosion of acid solution to base steel, promotes pickling effect, and when environment temperature 25 DEG C, corrosion inhibiter and hydrochloric acid add than being 0.012-0.015; Chlorohydric acid pickling adopts five descaling bath pickling, and each groove technological parameter is as follows:
2) wire rod phosphatization
Phosphating process parameters is as follows:
Promote phosphoric acid total acidity in parkerizing process to 48-53 point, improve speed and the quality of phosphorization filming with position, guarantee that phosphatization face quality reaches 9-10g/mm 2left and right, phosphatization smooth surface, densification;
(3) steel wire drawing
1) drawn steel wire diameter 5.05mm, drawing total draught 86%, the absolute deformation amount between wire rod and finished product steel wire is 8.95mm;
2) for making steel wire obtain high strength and good plasticity and toughness, adopt 11/1270 straight drawing machine to carry out drawing, drawing passes is 11 passages, and 1,4,8,11 passage diaphragm capsules adopt molding boxes, final capstan maximum speed 4m/s;
3) drawing process is as follows:
In drawing process, largest portion compression ratio, absolute deformation amount can not appear at same a time;
4) on reel, wire temperature controls: the wire temperature controlled on first, second volume reel must not more than 100 DEG C, on all the other reels, wire temperature must not more than 130 DEG C, because of when producing large gauge, high tensile steel wire, because deflection is comparatively large and be out of shape under DRY SLIDING, temperature rise phenomenon is serious, and higher temperature reduces making the plasticity of steel wire;
5) drawn steel wire mechanical property
Tensile strength 2050-2250MPa, torsion >=20 time, bending >=12;
(4) steel strand wires twisting and stabilization processes
1) steel strand wires twisting cover wire diameter is 5.05mm, and steel wire of internal layer diameter is 5.26mm, and twisting steel strand wires diameter is 15.40-15.34mm, lay pitch 230mm, and after steel strand wires tempering stabilization processes, diameter is 15.36-15.30mm;
2) steel strand wires stabilization processes tension force is the 44-47% of the disrumpent feelings tension force of steel strand wires, and stabilization processes temperature is 385 ± 5 DEG C, and steel strand wires loss of strength remains between 1.5-3.5%, guarantees that steel strand wires obtain good relaxation property, avoids large loss of strength;
(5) steel strand wires mechanical property
Tensile strength 2015-2110MPa, rupture pull force 282-295kN, yield force 247-253kN, percentage elongation 4-5.5%, relaxation rate 1.6%.

Claims (1)

1. a high strength steel strand production technology, strand structure is 1 × 7, and diameter is 15.20mm, and tensile strength is 2000MPa, it is characterized in that comprising following implementation step:
(1) raw material
Adopt diameter phi 14mm, 82B wire rod high-carbon wire rod, wire rod chemical composition is: C:0.82-0.84%, S≤0.025%, P≤0.0255%, Si:0.15-0.3%, Mn:0.6-0.9%, Cr:0.22-0.30%, V:0.05-0.1%, wire rod tensile strength 1200-1250MPa, contraction percentage of area > 30%;
(2) wire rod surface treatment
1) wire rod adopts chlorohydric acid pickling, pickling time 420s, simultaneously in order to reduce the corrosion of acid solution to base steel, promotes pickling effect, and when environment temperature 25 DEG C, corrosion inhibiter and hydrochloric acid add than being 0.012-0.015; Chlorohydric acid pickling adopts five descaling bath pickling, and each groove technological parameter is as follows:
2) wire rod phosphatization
Phosphating process parameters is as follows:
Promote phosphoric acid total acidity in parkerizing process to 48-53 point, improve speed and the quality of phosphorization filming with position, guarantee that phosphatization face quality reaches 9-10g/mm 2left and right, phosphatization smooth surface, densification;
(3) steel wire drawing
1) drawn steel wire diameter 5.05mm, drawing total draught 86%, the absolute deformation amount between wire rod and finished product steel wire is 8.95mm;
2) for making steel wire obtain high strength and good plasticity and toughness, adopt 11/1270 straight drawing machine to carry out drawing, drawing passes is 11 passages, and 1,4,8,11 passage diaphragm capsules adopt molding boxes, final capstan maximum speed 4m/s;
3) drawing process is as follows:
In drawing process, largest portion compression ratio, absolute deformation amount can not appear at same a time;
4) on reel, wire temperature controls: the wire temperature controlled on first, second volume reel must not more than 100 DEG C, on all the other reels, wire temperature must not more than 130 DEG C, because of when producing large gauge, high tensile steel wire, because deflection is comparatively large and be out of shape under DRY SLIDING, temperature rise phenomenon is serious, and higher temperature reduces making the plasticity of steel wire;
5) drawn steel wire mechanical property
Tensile strength 2050-2250MPa, torsion >=20 time, bending >=12;
(4) steel strand wires twisting and stabilization processes
1) steel strand wires twisting cover wire diameter is 5.05mm, and steel wire of internal layer diameter is 5.26mm, and twisting steel strand wires diameter is 15.40-15.34mm, lay pitch 230mm, and after steel strand wires tempering stabilization processes, diameter is 15.36-15.30mm;
2) steel strand wires stabilization processes tension force is the 44-47% of the disrumpent feelings tension force of steel strand wires, and stabilization processes temperature is 385 ± 5 DEG C, and steel strand wires loss of strength remains between 1.5-3.5%, guarantees that steel strand wires obtain good relaxation property, avoids large loss of strength;
(5) steel strand wires mechanical property
Tensile strength 2015-2110MPa, rupture pull force 282-295kN, yield force 247-253kN, percentage elongation 4-5.5%, relaxation rate 1.6%.
CN201510865701.6A 2015-12-02 2015-12-02 Production process of high-strength pre-stressed steel strands Pending CN105312341A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106180223A (en) * 2016-08-02 2016-12-07 贵州钢绳股份有限公司 A kind of production method of high intensity Z-shape steel silk
CN106180221A (en) * 2016-07-19 2016-12-07 奥盛（九江）新材料有限公司 Mould method is joined in a kind of high-strength prestressed steel wire drawing
CN106216427A (en) * 2016-08-02 2016-12-14 贵州钢绳股份有限公司 The production method of 1 × 7 21.6mm, 1860MPa high strength steel strand
CN108176720A (en) * 2017-12-18 2018-06-19 贵州钢绳股份有限公司 1 × 7-21.6mm, 1860MPa cable production line techniques
CN108252133A (en) * 2017-12-08 2018-07-06 天津冶金集团中兴盛达钢业有限公司 Super large-scale low relaxed prestress steel strand and its manufacturing method
CN109174985A (en) * 2018-08-14 2019-01-11 江阴法尔胜泓昇不锈钢制品有限公司 Promote the cold-drawing process of stainless steel wire tensile strength
CN109332546A (en) * 2018-02-18 2019-02-15 兰州斯凯特路桥预应力技术开发有限公司 A kind of novel steel strand wires production method
CN109853274A (en) * 2018-12-26 2019-06-07 天津冶金钢线钢缆集团有限公司 HDPE hot dip allumen prestress wire production technology
CN110421018A (en) * 2019-07-19 2019-11-08 江阴市建鑫金属有限公司 A kind of manufacturing method for the high tenacity welded steel fabric mated formation for bridge
CN111112353A (en) * 2019-12-16 2020-05-08 天地科技股份有限公司 Steel strand and manufacturing method and application thereof
CN111304537A (en) * 2020-03-25 2020-06-19 中国铁道科学研究院集团有限公司 Strength 2200 MPa-level prestressed steel strand and production process thereof
CN113814289A (en) * 2021-09-02 2021-12-21 贵州钢绳股份有限公司 Production method of Z-shaped sealing steel wire
CN114054529A (en) * 2021-11-15 2022-02-18 南通华东特种钢丝有限公司 Processing technology of special-shaped steel wire
CN114147083A (en) * 2021-12-02 2022-03-08 湖南湘钢金属材料科技有限公司 Preparation method of steel strand for prestressed concrete
CN114350913A (en) * 2021-12-27 2022-04-15 江苏省沙钢钢铁研究院有限公司 Steel strand stabilizing treatment process and treated steel strand
CN114653765A (en) * 2022-03-31 2022-06-24 宣化钢铁集团有限责任公司 1860Mpa steel strand production method
CN116145444A (en) * 2023-01-31 2023-05-23 张家港荣盛特钢有限公司 Preparation method of steel strand with fatigue stress amplitude above 300MPa

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* Cited by examiner, † Cited by third party
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106180221A (en) * 2016-07-19 2016-12-07 奥盛（九江）新材料有限公司 Mould method is joined in a kind of high-strength prestressed steel wire drawing
CN106180221B (en) * 2016-07-19 2018-10-26 奥盛（九江）新材料有限公司 Mould method is matched in a kind of high-strength prestressed steel wire drawing
CN106180223A (en) * 2016-08-02 2016-12-07 贵州钢绳股份有限公司 A kind of production method of high intensity Z-shape steel silk
CN106216427A (en) * 2016-08-02 2016-12-14 贵州钢绳股份有限公司 The production method of 1 × 7 21.6mm, 1860MPa high strength steel strand
CN108252133A (en) * 2017-12-08 2018-07-06 天津冶金集团中兴盛达钢业有限公司 Super large-scale low relaxed prestress steel strand and its manufacturing method
CN108176720A (en) * 2017-12-18 2018-06-19 贵州钢绳股份有限公司 1 × 7-21.6mm, 1860MPa cable production line techniques
CN109332546A (en) * 2018-02-18 2019-02-15 兰州斯凯特路桥预应力技术开发有限公司 A kind of novel steel strand wires production method
CN109174985A (en) * 2018-08-14 2019-01-11 江阴法尔胜泓昇不锈钢制品有限公司 Promote the cold-drawing process of stainless steel wire tensile strength
CN109853274A (en) * 2018-12-26 2019-06-07 天津冶金钢线钢缆集团有限公司 HDPE hot dip allumen prestress wire production technology
CN110421018A (en) * 2019-07-19 2019-11-08 江阴市建鑫金属有限公司 A kind of manufacturing method for the high tenacity welded steel fabric mated formation for bridge
CN111112353A (en) * 2019-12-16 2020-05-08 天地科技股份有限公司 Steel strand and manufacturing method and application thereof
CN111112353B (en) * 2019-12-16 2021-10-01 天地科技股份有限公司 Steel strand and manufacturing method and application thereof
CN111304537A (en) * 2020-03-25 2020-06-19 中国铁道科学研究院集团有限公司 Strength 2200 MPa-level prestressed steel strand and production process thereof
CN113814289A (en) * 2021-09-02 2021-12-21 贵州钢绳股份有限公司 Production method of Z-shaped sealing steel wire
CN113814289B (en) * 2021-09-02 2024-01-09 贵州钢绳股份有限公司 Z-shaped seal steel wire production method
CN114054529A (en) * 2021-11-15 2022-02-18 南通华东特种钢丝有限公司 Processing technology of special-shaped steel wire
CN114147083A (en) * 2021-12-02 2022-03-08 湖南湘钢金属材料科技有限公司 Preparation method of steel strand for prestressed concrete
CN114350913A (en) * 2021-12-27 2022-04-15 江苏省沙钢钢铁研究院有限公司 Steel strand stabilizing treatment process and treated steel strand
CN114653765A (en) * 2022-03-31 2022-06-24 宣化钢铁集团有限责任公司 1860Mpa steel strand production method
CN114653765B (en) * 2022-03-31 2024-03-22 宣化钢铁集团有限责任公司 Production method of 1860 Mpa-level steel strand
CN116145444A (en) * 2023-01-31 2023-05-23 张家港荣盛特钢有限公司 Preparation method of steel strand with fatigue stress amplitude above 300MPa

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