This standard specifies the classification, technical requirements, test methods, inspection rules, acceptance, packaging, marking and quality certificates of smooth steel wire and galvanized steel wire for building cables. This standard is applicable to smooth and hot-dip galvanized round steel wire for cables in cable-stayed bridges, suspension bridges and other cable structure projects. Other civil engineering steel wires can be used as a reference. CJ 3077-1998 Steel Wire for Building Cables CJ3077-1998 Standard Download Decompression Password: www.bzxz.net

CJ3077-1998
This standard is equivalent to the main technical indicators of galvanized steel wire in the American Society for Testing and Materials standard ASTMA421-91 "Prestressed concrete stress relief smooth steel wire" and the French industrial standard NFA35-035-93 "Prestressed hot-dip galvanized round steel wire and steel strand", and can cover the steel wire technical terms and requirements in CJ3058-1996 "Plastic sheathed semi-parallel steel wire cable", making the level of this standard reach the international advanced level.
This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the Beijing Municipal Engineering Design Institute, the technical unit responsible for urban road and bridge standards of the Ministry of Construction. This standard is drafted by Shanghai Municipal Engineering Design Institute and Shanghai Shenjia Metal Products Co., Ltd., and Shanghai Cable Research Institute and Shanghai Pujiang Jisuo Co., Ltd. participated in the preparation. The main drafters of this standard are: Sun Jinmao, Weng Sirong, Ding Xinkang, Luo Guoqiang, Mao Qingchuan. This standard is entrusted to Shanghai Municipal Engineering Design Institute for interpretation. 402
1 Scope
Standard of Urban Construction Industry of the People's Republic of China Steel-wire for Construction Cable
Steel-wire for construction cableCJ 3077—1998
This standard specifies the classification, technical requirements, test methods, inspection rules, acceptance, packaging marks and quality certificates of smooth steel wire and galvanized steel wire for construction cables.
This standard applies to smooth and hot-dip galvanized round steel wire (hereinafter referred to as steel wire) for cables in cable-stayed bridges, suspension bridges and other cable structure projects. Other steel wires for civil engineering can be used as a reference. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T228-1987Methods for tensile testing of metalsGB/T238-1984Methods for repeated bending test of metal wiresGB/T2103-1988General provisions for acceptance, packaging, marking and quality certification of steel wiresTest method for copper sulfate of zinc layer on galvanized steel wire
GB/T 2972-1991
GB/T 2973-1991
Test method for weight of zinc layer on galvanized steel wire
Test method for winding of metal wires
GB/T 2976--1988
GB/T 8653—19881
Test method for Young's modulus, chord modulus, tangent modulus and Poisson's ratio of metals (static method) 3 Classification of steel wire
This standard divides steel wire into two categories according to its surface state: smooth steel wire (B) and galvanized steel wire (G). It is divided into normal relaxation (Grade I) and low relaxation (Grade II) according to its relaxation performance. Each surface state and relaxation performance contains two size specifications and two strength levels for selection. The marking examples are as follows:
Galvanized steel wire with a nominal diameter of 7.0mm, a nominal tensile strength of 1570MPa, and a relaxation level of I is marked as: Steel Wire 7.0-15701-G-CJ3077-1998The smooth steel wire with a nominal diameter of 5.0mm, a nominal tensile strength of 1670MPa, and a relaxation level of II is marked as: Steel Wire 5.0-1670I-B-CJ3077-19984Basic requirements for steel wire manufacturing
4.1The steel grade of the wire rod used to manufacture the steel wire shall be selected by the manufacturer, and its sulfur and phosphorus content shall not exceed 0.025%, and the copper content shall not exceed 0.20%.
4.2The wire rod used to manufacture the steel wire shall be treated with sorbitization. 4.3The galvanizing process of the steel wire must be hot-dip galvanized. Approved by the Ministry of Construction of the People's Republic of China on December 3, 1998 and implemented on May 1, 1999
5 Technical requirements
5.1 Mechanical properties
CJ 3077--1998
5.1.1 The mechanical properties of steel wire shall comply with the provisions of Table 1. Steel wires with mechanical properties of other strength levels other than those in Table 1 may be agreed upon by both the supplier and the buyer based on actual project needs.
Mechanical properties of steel wire
Nominal tensile strength
Nominal diameter
≥1570
≥1 670
≥1570
≥1670
Specified non-proportional elongation
Stress (kitchen strength)
Opo.2,MPa
Grade I relaxation
Grade II relaxation
≥1250
≥1330bzxZ.net
≥1 250
≥1330
≥1330
≥1410
≥1330
≥1410
Elongation
(., -- 250mm)
Number of bends
Bending radius
Number/180°
3dx8 turns
No break
No break
Initial stress
Percentage of nominal strength, %
Relaxation rate
1000h stress loss
Grade I relaxation
Grade II relaxation
The elastic modulus of the steel wire for Grade I relaxation should be (1.90~~2.10)×105MPa; for Grade I relaxation, it should be (1.95~5.12
2.10)X105MPa.
5.1.3 The supplier shall ensure that the 1000h relaxation performance is qualified. A 120h relaxation test can be carried out, and the 1000h relaxation value can be calculated from it.
5.1.4 The steel wire used for the cable of the cable-stayed bridge and the suspension bridge sling should not break after bearing 2 million times of 0.45Fm~~ (0.45Fm-△F) load.
The stress amplitude is required to be:
AF./A, = 360 MPa
Where: F.---Nominal breaking tension of the steel wire, N; AF.
Equivalent load amplitude of the stress amplitude, N;
A,--Nominal cross-sectional area of ​​the steel wire, mm2.
5.2 Diameter and allowable deviation
5.2.1 The diameter and deviation of the steel wire shall comply with the provisions of Table 2. Dimensions and allowable deviations of steel wire
Nominal diameter of steel wire
Allowable deviation of diameter
Note: When calculating the theoretical mass of steel wire, the density of steel is 7.85g/cm. Out-of-roundness
5.2.2 The nominal diameter of galvanized steel wire shall include the thickness of the zinc layer. 5.2.3 Steel wires of other sizes and allowable deviations may also be supplied upon negotiation between the supplier and the buyer. 5.3 Galvanized layer of steel wire
5.3.1 The weight of the zinc layer shall not be less than 300g/m2. Nominal cross-sectional area
Theoretical mass per meter
5.3.2 Zinc layer adhesion test After being tightly wound 2 times on a core with a diameter of 5 times the nominal diameter of the steel wire, the zinc layer of the steel wire shall not peel, crack or flake off to the extent that it can be wiped off with bare fingers (without nails). 5.3.3 Uniformity of zinc layer Copper sulfate test, not less than 4 times (once per minute). If the user needs, we can also provide 404 galvanized steel wire with no less than 5 times.
CJ3077—1998
5.3.4 The surface of the steel wire should have a continuous galvanized layer, which should be smooth and even, without cracks, spots or places without galvanized layer. Local slight scratches that do not affect the quality of the zinc layer are allowed. 5.4 Process performance and finished product quality
5.4.1 Straightening performance
Take a steel wire sample with a chord length of 1000mm and place it freely on a flat surface. Both ends must be in contact with the flat surface. The maximum vertical distance between the chord and the arc shall not be greater than 30mm.
5.4.2 Cold properties
The steel wire should be able to be cold-forged into a drumstick shape. The outer diameter of the drum is generally (1.5±0.1) times the diameter. Non-penetrating longitudinal cracks parallel to the axis of the steel wire are allowed on the forging head without affecting the requirements for anchoring, but transverse cracks are not allowed. 5.4.3 The steel wire should not have kinks.
5.4.4 The steel wire is supplied in bundles, with a minimum inner diameter of 15(00mm. Each coil should consist of one steel wire. 5.4.5 The finished steel wire should not have welding points. The electrical joints welded for connection work should be cut off when the finished steel wire is finished. 5.4.6 The tempering color and local slight rust of the smooth steel wire after stabilization heat treatment are allowed. 5.4.7 Unless otherwise specified, the weight of the steel wire coil is generally ≥800kg, accounting for 95%, and the rest is ≥400kg. 6 Test method
6.1 The surface of the steel wire is visually inspected.
6.2 The minimum graduation value of the steel wire diameter is 0.01mm gauge, select a section on the straight part of the tension-free steel wire, and measure the wire diameter in two mutually perpendicular directions. The wire sagittal height is measured by a gauge with a minimum graduation value of 1mm. The wire coil diameter is measured by a gauge with a minimum graduation value of 1cm. 6.3 Tensile test
6.3.1 The tensile test of steel wire shall comply with the provisions of GB/T228, the gauge length is 250mm, and the cross-sectional area of ​​the steel wire is calculated according to the nominal diameter of the steel wire.
6.3.2 In order to facilitate the supplier's daily inspection, the specified total elongation stress n of the steel wire can also be measured as its yield strength. That is, the stress when the elongation of the original gauge length of the steel wire reaches 1% under load. The value can be delivered when it meets the provisions of this standard, but the pm.2 should be measured as the yield strength of the steel wire during the arbitration test. The preload during the measurement is 10% of the nominal yield load, and the elongation caused by the preload on the specimen should be added to the total elongation. 6.4 The repeated bending test of steel wire shall comply with the provisions of GB/T238. 6.5 The copper sulfate test of steel wire shall comply with the provisions of GB/T2972. 6.6 The zinc layer weight test of steel wire shall comply with the provisions of GB/T2973. 6.7 The winding test and zinc layer adhesion test of steel wire shall comply with the provisions of GB/T2976, but the winding speed shall not exceed 15r/min. 6.8 Relaxation test
6.8.1 The ambient temperature of the sample shall be maintained within the range of (20±2)°C during the test. 6.8.2 No heat treatment or cold processing shall be performed after the sample is prepared. 6.8.3 The initial load applied to the sample shall be 70% of the nominal tensile strength multiplied by the nominal cross-sectional area of ​​the steel wire. 6.8.4 The initial load shall be evenly loaded within 3 to 5 minutes, and the length shall be kept constant. For level 1 relaxation, the load shall be held for 2 minutes, and for level 2 relaxation, the relaxation value shall be recorded after holding the load for 1 minute. 6.8.5 During the loading operation, there should be no overload phenomenon. 6.8.6 The gauge length of the specimen should not be less than 60 times the nominal diameter of the steel wire. 6.9 The elastic modulus test of the steel wire should comply with the provisions of GB/T8653. 6.10 Fatigue test
CJ 3077 -- 1998
6.10.1 The pulsating tensile fatigue test is to subject the specimen to pulsating tensile stress between two loads (predetermined pulsating tensile maximum load and minimum load).
6.10.2 The specimen size (i.e. free length) between the two anchor-shaped chucks should be as long as possible, at least 200mm. 6.10.3 In order to avoid the specimen from breaking at the chuck of the testing machine, appropriate cold working is allowed in the clamped area of ​​the specimen, but no treatment shall be performed in the middle section of the specimen, and the length of the middle section shall not be less than 150mm. 6.10.4 During the whole process of the test, the maximum load and minimum load of the pulsating tension shall remain constant. Therefore, the appropriate method is to consider a device that can periodically check the load or record it. The law of the pulsating load should be a sine wave, and the load control accuracy should be within 1%.
6.10.5 The frequency of the pulsating load should be 3.3~～167Hz (i.e. 200~10000 times/min), and the number of cycles can differ by 103. 6.10.6 The test device should make the specimen axially stressed. During the pulsating loading process, the specimen should not have any slippage in the anchor clamp. When the specimen breaks within 3 times the nominal diameter of the steel wire from the anchor clamp or in the clamp, the test is considered invalid and the test should be restarted.
7 Inspection rules
7.1 Steel wires should be inspected in batches, and each batch consists of steel wires of the same steel grade, the same furnace number, the same specification, and the same production process. 7.2 Sampling and inspection requirements
7.2.1 Take samples from the end of each coil of steel wire for tensile strength, bending, elongation, size and deviation, and surface quality tests. 7.2.2 Take samples from the end of 10% of the coils for yield strength, winding, zinc layer weight, adhesion, copper sulfate, etc., but there shall be no less than three coils in each contract.
7.2.3 Take at least one sample for elastic modulus test for every 50t; take at least one sample for relaxation test for every 200-300t, and steel wire fatigue test shall be conducted once per batch or every 500t, or as agreed by both parties. 7.2.4 The number of inspection samples shall generally be implemented in accordance with the above terms, and may be agreed by both parties under special circumstances. 8 Acceptance, packaging, marking and quality certificate The acceptance, packaging, marking and quality certificate of steel wire shall comply with the provisions of GB/T2103, and shall generally be packaged as Class C. Special requirements shall be stated in the contract.4. The number of samples for inspection shall generally be in accordance with the above provisions. Special circumstances may be agreed upon by both parties. 8. Acceptance, packaging, marking and quality certificate The acceptance, packaging, marking and quality certificate of steel wire shall comply with the provisions of GB/T2103. Generally, it shall be packaged in Class C. Special requirements shall be indicated in the contract.4. The number of samples for inspection shall generally be in accordance with the above provisions. Special circumstances may be agreed upon by both parties. 8. Acceptance, packaging, marking and quality certificate The acceptance, packaging, marking and quality certificate of steel wire shall comply with the provisions of GB/T2103. Generally, it shall be packaged in Class C. Special requirements shall be indicated in the contract.
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