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Standard ID | GB/T 20118-2017 (GB/T20118-2017) | Description (Translated English) | Steel wire ropes for general purposes | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | H49 | Classification of International Standard | 77.140.65 | Word Count Estimation | 50,513 | Date of Issue | 2017-12-29 | Date of Implementation | 2018-09-01 | Older Standard (superseded by this standard) | GB/T 20118-2006 | Drafting Organization | Guizhou Steel Wire Co., Ltd. | Administrative Organization | National Steel Standardization Technical Committee | Regulation (derived from) | National Standards Bulletin 2017 No. 32 | Proposing organization | China Iron and Steel Association | Issuing agency(ies) | People's Republic of China General Administration of Quality Supervision, Inspection and Quarantine, China National Standardization Administration | Standard ID | GB/T 20118-2006 (GB/T20118-2006) | Description (Translated English) | Steel wire ropes for general purpose | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | H49 | Classification of International Standard | 77.140.65 | Word Count Estimation | 51,534 | Date of Issue | 2006-03-01 | Date of Implementation | 2006-09-01 | Older Standard (superseded by this standard) | GB/T 8918-1996 | Quoted Standard | GB/T 228; GB/T 238; GB/T 239; GB/T 2104; GB/T 2973 | Adopted Standard | ISO/DIS 2408-2002, MOD | Drafting Organization | Guizhou Wire Rope Co., Ltd. | Administrative Organization | National Steel Standardization Technical Committee | Regulation (derived from) | National Standard Approval Announcement 2006 No.3 (Total No.90) | Proposing organization | China Iron and Steel Association | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This standard specifies the classification of wire rope, ordering content, materials, technical requirements, inspection, trial, inspection methods, packaging, marking and quality certification. This standard applies to machinery, construction, ship, various round strand wire rope tramway and other industries use, fisheries, forestry, mining. |
GB/T 20118-2017
Steel wire ropes for general purposes
ICS 77.140.65
H49
National Standards of People's Republic of China
Replace GB/T 20118-2006
General technical conditions for wire rope
(ISO 2408.2017, Steelwireropes-Requirements, NEQ)
Released on.2017-12-29
2018-09-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword I
1 range 1
2 Normative references 1
3 Terms and Definitions 1
4 Category 3
5 mark 4
6 Ordering Content 5
7 Material 5
8 Technical requirements 6
9 inspection 16
10 Test 17
11 Acceptance method 19
12 Packaging, Marking and Quality Certificate 20
13 Wire rope safety use and maintenance 20
Appendix A (Normative Appendix) Minimum breaking force table for wire rope type, diameter and class 21
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 20118-2006 "General Purpose Wire Rope". Compared with GB/T 20118-2006, the main changes are as follows.
---Change the standard name;
---Adjusted the diameter range of part of the wire rope structure;
--- Added wire rope terminology and definition requirements and definitions of key terms;
--- Added steel wire ropes of 11 structural categories;
--- Table 4 increased the tensile strength of 1370, 1470 rope wire, Table 5 canceled 1670, 1870 two wire rope grade;
--- Increased composite core (CC) and solid polymer core (SPC) and technical requirements;
--- Removed the requirement for the lay length of the wire rope and the strand;
---Modified the minimum distance requirement between wire rope joints;
--- Technical requirements for wire rope manufacturing have added wire rope structure and wire rope grade technical requirements;
--- Increased technical requirements for allowable deviation and out-of-round tolerance of profiled strands and single strands;
--- Table 8 added the reference weight coefficient and minimum breaking force coefficient of 11 wire rope categories, adding 4 wire rope categories
The minimum breaking force coefficient of the metal core wire rope;
--- Expanded steel wire nominal diameter range of 0.15mm ≤ d < 4.80mm;
--- Revised the calculation data of the number of low-value steel wires in Table 13, and deleted the low-value steel wire number requirement of 100% test in Table 13, and gave
The calculation method for the number of low-value steel wires of other structural steel wire ropes not included in the table;
--- Modified the minimum graduation value of the vernier caliper;
--- Increased requirements for wire rope core, oil coating, structure, surface quality inspection items;
--- Added the method of calculating the measured breaking force;
--- Increased safety, use and maintenance requirements for wire ropes;
--- Adjusted part of the wire rope structure wire rope grade.
This standard uses the redrafting method to refer to ISO 2408.2017 "wire rope requirements", and the consistency process with ISO 2408.2017
Degree is not equivalent.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Guizhou Steel Rope Co., Ltd., Jiangsu Yuyu Metal Products Co., Ltd., Metallurgical Industry Information Standards Institute,
Jiangsu Saifu Tiangang Cable Co., Ltd., Jiangsu Shenwang Group Steel Cable Co., Ltd., Jianfeng Rigging Co., Ltd., Nantong Songcheng Industrial Co., Ltd.
the company.
The main drafters of this standard. Huang Zhongqu, Wang Xiaogang, He Xiaoyu, Ren Cuiying, Wang Lingjun, Xue Jianjun, Yang Yuemin, Li Lunyou, Huang Wei,
Lin Zhuying, Wang Xiaozhu, Huang Jianming, Yu Shaohong, Cui Zhiqiang, Cai Hong, Cheng Wei.
The previous versions of the standards replaced by this standard are.
---GB/T 1102-1974;
---GB/T 8918-1988, GB/T 8918-1996;
---GB/T 20118-2006.
General technical conditions for wire rope
1 Scope
This standard specifies the terms and definitions, classification, marking, ordering content, materials, technical requirements, inspection of steel wire ropes with a diameter of not more than 60mm.
Inspection, testing, acceptance methods, packaging, marking and quality certificates, wire rope safety, use and maintenance.
This standard applies to the general technical conditions of various structural steel wire ropes made of smooth and coated carbon steel wire.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 238 metal material wire repeated bending test method
GB/T 239.1 Metallic materials and wires - Part 1
GB/T 1839 steel product galvanized layer quality test method
General provisions for GB/T 2104 wire rope packaging, marking and quality certificates
GB/T 8358 wire rope actual breaking tensile force determination method
GB/T 8706 wire rope terminology, marking and classification
GB/T 21965 wire rope acceptance and defect terminology
GB/T 29086 wire rope safety use and maintenance
Numerical correction of YB/T 081 metallurgical technical standard and determination of test data
YB/T 4452 steel wire rope core
YB/T 5343 round wire for rope making
NB/SH/T 0387 Grease for wire rope
3 Terms and definitions
The following terms and definitions as defined in GB/T 8706 apply to this document.
3.1
Wire rope ropelaylength
The outer steel wire of the single-strand steel wire rope, the outer strand of the multi-strand steel wire rope rotates around the axis of the steel wire rope (or a spiral) and is parallel to the steel
The distance between the two points of the axis of the wire (see Figure 1).
Description.
( ). the number of the stock
Figure 1 捻 distance (in the case of 6 strands of wire rope)
3.2
Wire rope's direction to directiondirectionrope
The outer steel wire is in the single twisted steel wire rope or the outer strand is in the twisting direction of the wire rope axis in the multi-strand steel wire rope, ie right 捻 (Z) or left 捻
(S) (see Figure 2).
Figure 2 The direction of the strands in the wire rope
3.3
Twisting type and direction of wire rope directionandtypeoflay
3.3.1
Interactive 捻(sZ zS) ordinarylay
The twist of the wire rope is opposite to the twist of the outer strand. It is divided into right interaction 捻 (sZ) and left interaction 捻 (zS) (see Figure 3).
Note. The first lowercase letter indicates the direction of the strand, and the second capital letter indicates the twist of the wire rope.
Figure 3 Interaction捻
3.3.2
同向捻(zZ sS)langlay
The twist of the wire rope is the same as the twist of the outer strand. It is divided into right-same 捻 (zZ) and left-same 捻 (sS) (see Figure 4).
Note. The first lowercase letter indicates the direction of the strand, and the second capital letter indicates the twist of the wire rope.
Figure 4
4 classification
Wire ropes are classified according to the system given in GB/T 8706. Single-layer strand wire ropes (ie single-layer round strands and shaped strands) are shown in Table 1.
The round wire rope is shown in Table 2, and the single wire rope is shown in Table 3.
Table 1 Single-layer strand wire rope
Category (without cord)
Steel wire outer layer
Number of strands, number of outer strands, number of strands, number of outer wires, number of outer wires, number of strands of steel wire, number of strands
4×19
4×36
15~26
29~57
7~12
12~18
2~3
3~4
Parallel
Parallel
6×7
6×12
6×15
6×19
6×24
6×36
5~9
15~26
29~57
4~8
7~12
12~16
12~18
2~3
2~3
3~4
Single
Single
Single
Parallel
Parallel
Parallel
6×19M
6×24M
6×37M
6×61M
8×19M
8×37M
12~19
27~37
45~61
12~19
27~37
9~12
12~16
16~18
18~24
9~12
16~18
Multi-process point contact
Multi-process point contact
Multi-process point contact
Multi-process point contact
Multi-process point contact
Multi-process point contact
8×7
8×19
8×36
5~9
15~26
29~57
4~8
7~12
12~18
2~3
3~4
Single
Parallel
Parallel
Shaped strand wire rope
6×V7
6×V19
6×V37
6×V8
6×V25
4×V39
7~9
21~24
27~33
8~9
15~31
39~48
7~9
10~14
15~18
8~9
9~18
15~18
Single
Multi-process point contact/parallel 捻
Multi-process point contact/parallel 捻
Single
Parallel
Multi-process composite
Note 1. For 6×V8 and 6×V25 triangular strands, the core of the strand is an independent triangular core, and all the strands are recorded as one. When using 1×7-3,
When a 3×2-3 or 6/core core is used, the number of strands of the core wire is calculated into the wire strand structure.
Note 2. The 6×29F structural steel wire rope is classified into 6×36 types.
Table 2 Rotating round strand wire rope
category
Steel wire outer layer
Number of shares
(except core)
Number of outer strands, number of strands, number of outer strands, number of outer strands, number of strands of steel wire, number of strands
2 times
23×7
18×7
18×19
18×19M
35(W)×7
35(W)×19
21~27
17~18
17~18
17~18
27~40
27~40
15~18
10~12
10~12
10~12
15~18
15~18
5~9
5~9
15~26
12~19
5~9
15~26
4~8
4~8
7~12
9~12
4~8
7~12
2~3
2~3
Single
Single
Parallel
Multi-process point contact
Single
Parallel
3 times
34(M)×7 34~36 17~18 3 5~9 4~8 1 Single
Note. The 4-strand wire rope can also be designed to resist rotating wire rope.
Table 3 Single strand wire rope
Category wire number outer wire number wire layer
1×7 5~9 4~8 1
1×19 17~37 11~16 2~3
1×37 34~59 17~22 3~4
1×61 57~85 23~28 4~5
5 mark
The marking of the wire rope is in accordance with the provisions of GB/T 8706; the structural arrangement of the strands is marked from the center to the outer layer.
An example of a wire rope marker is shown in Figure 5.
Figure 5 Example of wire rope marking
6 Ordering content
The contract for wire rope ordering according to this standard shall include the following main contents.
a) the number of this standard;
b) product name;
c) structure (marker code);
d) nominal diameter;
e) wire rope level;
f) the type of rope core;
g) direction and type of tanning;
h) surface state (glossy or plating);
i) quantity (length, number of rolls, weight);
j) Lubrication requirements (corrosion of ropes, strands and greases);
k) use;
l) Other specific requirements.
7 materials
7.1 Wire for rope making
7.1.1 The technical requirements for steel wire before rope making (including central steel wire, filled steel wire and core wire) shall comply with the general purpose steel in YB/T 5343.
Silk regulations. The surface condition and nominal tensile strength of the steel wire shall comply with the requirements of Table 4.
Table 4 Wire surface state and nominal tensile strength
Surface state nominal tensile strength/(N/mm2)
Smooth and Class B coatings 1370, 1470 1570, 1670 1770, 1870 1960 2160
AB grade plating 1370, 1470 1570, 1670 1770, 1870 1960 2160
Class A plating 1370, 1470 1570, 1670 1770, 1870 1960 -
7.1.2 The tensile strength level of the steel wire for the rope before the tensile strength of the wire rope shall comply with the requirements of Table 5. But the same wire layer
All steel wires of the same diameter should have the same tensile strength grade and plating grade.
Table 5 Tensile strength grade of wire rope for wire rope grade
Wire rope grade steel wire nominal tensile strength range/(N/mm2)
1570 1370~1770
1770 1570~1960
1960 1770~2160
2160 1960~2160
Note. The minimum breaking force value of the wire rope is calculated based on the tensile strength level of the wire rope grade rather than the single steel wire.
7.2 core (C)
The core of the wire rope is usually a fiber core or a steel core, but other types of cores such as a hybrid core and a solid polymer core may also be used. should be
One of the following types.
7.2.1 Fiber core (FC)
Made from natural fiber (NFC) sisal and jute or synthetic fiber (SFC) and other fibers that meet the requirements. Unless otherwise requested by the purchaser,
The fiber core should be coated with anti-corrosion, anti-rust and grease, except for the oil-free wire rope core.
Fiber rope cores with a diameter greater than or equal to 8 mm of single-strand steel wire rope shall be twisted at least twice (ie made of fibres, then by strands)
Made of rope).
7.2.2 Steel core (WC)
A core consisting of a separate wire rope (IWRC) or wire strand (WSC).
Note 1. The outer core of the steel core can also be coated with fibers and solid polymers.
Note 2. Single-layer multi-strand wire rope cores with a diameter greater than 12 mm are usually independent wire ropes, unless otherwise required by the purchaser.
7.2.3 Composite core (CC)
A steel cord core made of steel and fiber or steel and solid polymer composite.
7.2.4 Solid Polymer Core (SPC)
A core made of a circular or grooved circular solid polymer material may also contain steel wires or fibers inside.
7.2.5 Other requirements
The buyer can specify other types of cores.
7.3 Wire rope grease
Grease for wire ropes shall comply with NB/SH/T 0387 or other relevant technical requirements.
8 Technical requirements
8.1 Shareholding system
8.1.1 The steel wire in the strand should be even and tight. There should be no manufacturing defects in the GB/T 21965 standard.
8.1.2 For the strands made of steel wire of the same nominal diameter, the center wire of the strands shall be appropriately enlarged. There should be more uniform between adjacent wires in the same strand
The gap.
8.2 Twisting of wire rope
8.2.1 The wire rope shall be twisted evenly, tightly and not loosely (except for the rotating wire rope). In the unfolded and unloaded condition, the wire rope should not
It is wavy. There should be no staggering, bending and broken wire in the wire rope, and there should be no defects such as sturdy strands, but it is allowed to be processed by the process.
The slight deformation of the steel wire caused by the compression of the preparation and deformation of the clamps exists.
8.2.2 There should be no significant difference in the distance between the same wire ropes.
8.2.3 When the steel wire rope is manufactured, the same diameter steel wire of the same layer shall be the same tensile strength of the same steel wire, and different diameter steel wires shall be allowed to adopt the phase.
Same or meet the requirements of the range of tensile strength of steel wire specified in Table 5, but the minimum breaking force of the wire rope and the minimum breaking force of the steel wire shall be ensured.
The sum meets the requirements of Tables A.1 to A.32.
8.2.4 The core size of the wire rope shall have sufficient supporting effect to make the outer strands of the outer wrap evenly. Between adjacent foreign shares
There is a more even gap.
8.3 wire joint
The joints of the steel wire in the wire rope should be minimized. Wires larger than 0.40 mm in diameter are applied to butt welds with diameters less than and equal to
The 0.4 mm steel wire is connected by butt welding or by plugging and screwing. For multi-strand wire ropes, the minimum distance between the wire joints per share must not be less
18 times the diameter of the wire rope. For a single strand of wire rope, the minimum distance between any wire layer joint shall not be less than the diameter of the wire rope
36 times.
8.4 Oiling of wire rope
At least all stocks should be oiled unless otherwise requested by the purchaser. The wire rope should be evenly coated with rust and grease. Its surface should not
There are places where no grease is applied.
8.5 Surface quality of wire rope
There should be no manufacturing defects in GB/T 21965 on the surface of the wire rope.
8.6 Wire rope structure
The wire rope structure may be one of the structures in Tables A.1 to A.32, or other structural wire ropes specified by the manufacturer. At the buyer
Where only the wire rope category is specified, the wire rope structure shall be determined by the manufacturer as required. Usually the buyer should specify the structure of the wire rope or
category.
8.7 Wire rope grade
8.7.1 Wire rope grade is the level of breaking force of the wire rope expressed by numerical value. Such as. 1770.
8.7.2 The wire rope grade shall comply with the requirements of Tables A.1 to A.32. Wire ropes that meet the requirements can also be provided by the buyer in consultation with the manufacturer.
8.8 Wire surface condition
For steel wire ropes made of coated steel wire, Class A, Class AB and Class B steel wires can be used, but the same diameter of steel wire plating in the same layer should be
the same. The steel wire in the coated steel wire rope shall all have a plating layer, including a steel wire of a metal steel core. The plating level of the wire rope is from the outer strand
The outer steel wire coating level is determined.
8.9 Wire rope method
The multi-strand wire rope shall be one of a)~d), and the single-strand wire rope shall be one of e)~f). The method of wire rope shall be determined by the purchaser.
a) right interaction 捻 (sZ);
b) left interaction 捻 (zS);
c) right same direction (zZ);
d) left-handed 捻 (sS);
e) right (Z);
f) Left (S).
The profiled strands should be in the same direction (4×V39 category should be interactive). The inner layer of the wire rope that resists the rotation category is determined by the supplier.
set. 4×19, 4×36, 6×24M, 6×37M, 6×61M, 6×12, 6×15, 6×24, 8×37M, etc. should be interactive.
8.10 nominal diameter
The nominal diameter is the nominal diameter of the wire rope and should be determined by the supplier and the buyer at the time of signing the contract.
8.10.1 measured diameter
The measured diameter of the wire rope is the diameter measured by the method specified in 9.1.1.
8.10.2 Diameter tolerance and out-of-roundness
The diameter and out-of-roundness of the wire rope shall comply with the requirements of Table 6.
Table 6 Wire rope diameter tolerance and out-of-roundness
Wire rope
Types of
Wire rope
Nominal diameter D/
Mm
Allowable deviation /% Out of roundness is not greater than /%D
Steel core or fiber core
Wire rope
Strand with fiber core
Wire rope
Steel core or fiber core
Wire rope
Strand with fiber core
Wire rope
Round wire rope
0.6≤D< 4
- 7 -
4≤D< 6
6≤D< 8
D≥8
Shaped strand wire rope D≥18
Single strand wire rope D≥0.6
- 3 -
8.11 Length and its allowable deviation
Wire ropes shall be supplied in accordance with the order length, expressed in m, and shall comply with the requirements of Table 7.
Table 7 The length tolerance unit is m
Length L0 allows deviation
L0≤400 0~ 5%L0
400 \u003cL0≤1000 0~ 20
L0 >1000 0~ 2%L0
8.12 Reference weight
The reference weight of the wire rope is expressed in kg/100m and is calculated according to formula (1).
M = WD2 (1)
In the formula.
M --- the reference weight per unit length of the wire rope, in kilograms per 100 meters (kg/100m);
D --- the nominal diameter of the wire rope, in millimeters (mm);
W --- wire rope unoiled a certain structural category wire rope nominal length reference weight coefficient, the unit is kilograms per 100 square meters
Meter [kg/(100m·mm2)], K value is shown in the coefficient given in Table 8;
W1--- is the reference weight coefficient per unit length of the fiber rope wire rope;
W2--- is the reference weight coefficient per unit length of the independent steel cord core (IWRC) steel cord;
W3--- is the reference weight coefficient per unit length of the wire core (WSC) wire rope.
Table 8 Wire rope reference weight coefficient and minimum breaking force coefficient
Wire rope type wire rope category
Natural fiber core wire rope steel core wire rope
Weight coefficient
W1
Minimum breaking force coefficient
K1
Minimum breaking coefficient of tensile coefficient
W2 W3 K2 K3
Single layer wire rope
6×7 0.351 0.332 0.387 0.396 0.359 0.388
6×12 0.251 0.209
6×15 0.200 0.180
6×19 0.380 0.330 0.418 0.356
6×24 0.331 0.291
6×36 0.380 0.330 0.418 0.356
6×19M 0.351 0.307 0.400 0.381 0.332 0.362
6×24M 0.318 0.280
6×37M 0.346 0.295 0.400 0.381 0.319 0.346
6×61M 0.361 0.283 0.398 0.306
8×19M
8×37M
0.356 0.261 0.420 0.310
8×7 0.327 0.291 0.391 0.464 0.359 0.404
8×19 0.357 0.293 0.435 0.346
8×36 0.357 0.293 0.435 0.346
4×19
4×36
0.410 0.360
Shaped stock
Wire rope
6×V7 0.412 0375 0.437 0.398
6×V19
6×V37
0.405 0.360 0.429 0.382
6×V8 0.410 0.362
6×V25 0.410 0.351
4×V39 0.410 0.360
Resistance rotation
Wire rope
23×7 0.470 0.360
18×7
18×19
0.390 0.310 0.430 0.328
35(W)×7
35(W)×19
0.460
0.360a
0.350b
34(M)×7 0.400 0.308 0.430 0.318
Single stock
Wire rope
1×7 0.522 0.540
1×19 0.507 0.530
1×37 0.501 0.512
1×61 0.487 0.510
Table 8 (continued)
Wire rope type wire rope category
Natural fiber core wire rope steel core wire rope
Weight coefficient
W1
Minimum breaking force coefficient
K1
Minimum breaking coefficient of tensile coefficient
W2 W3 K2 K3
The weight coefficient and minimum breaking force coefficient of 6×V21FC and 6×V24FC structural steel ropes should be 8% smaller than the data in the table. 6×V30
The minimum breaking force coefficient of the structural steel wire rope should be 10% smaller than the data in the table. Weight coefficient and minimum breaking force of 6×V37S structural steel wire rope
The number should be 3% larger than the data in the table.
The wire length per unit length of the synthetic fiber core is 2.5% smaller than the data for W1 listed in the table.
Composite core and solid polymer core steel wire rope minimum breaking tensile coefficient K1 is the same as natural fiber core wire rope, weight coefficient than natural fiber core wire rope
The data is 3.5% larger.
Note. The weight factor is for reference only.
a Less than or equal to the 1960 grade wire rope.
b A wire rope greater than 1960 grade but less than or equal to 2160 grade wire rope.
8.13 Broken wire tension
The measured value of the breaking force of the wire rope shall not be lower than the values specified in Table A.1 to Table A.32 or the agreement between the supplier and the buyer. Wire rope minimum
Broken tensile force, expressed in kN, and calculated according to equation (2).
F0=KD2R0/1000 (2)
In the formula.
F0---The minimum breaking force of the wire rope, the unit is kN (kN);
D --- is the nominal diameter of the wire rope, in millimeters (mm);
R0--- is the wire rope grade;
K --- is the minimum breaking force coefficient of a given type of wire rope, K value is shown in Table 8;
K1--- is the minimum breaking force coefficient of the fiber rope wire rope;
K2--- is the minimum breaking tensile wire rope coefficient of the independent steel cord core;
K3---The minimum breaking force coefficient of the steel wire rope with the steel wire strand as the rope core.
8.14 Requirements for the wire removal
8.14.1 Measured diameter
The measured diameter of the wire shall comply with the relevant provisions of YB/T 5343. Allows no more than 3% of the measured wire to exceed YB/T 5343
The regulations are, but cannot exceed 50% of the allowable deviation of the regulation. The measured diameter of the stranded wire rope split wire is not evaluated.
The manufacturer shall provide the customer with the nominal diameter and nominal tensile strength of the steel wire rope.
8.14.2 Tensile strength
The measured tensile strength of the stranded wire rope split wire shall not be lower than that specified in Table A of Table 9. Shaped strand wire rope split wire
The strength value should not be lower than the provisions in column B of Table 9.
8.14.3 Twisting of steel wire
The minimum number of twists of round wire rope wire shall comply with the requirements of Table 10. The minimum number of twists of the profiled strand wire rope is allowed in
Table 10 is reduced by 1 time.
Table 9 Allowable values of tensile strength
Nominal tensile strength/(N/mm2) 1370 1570 1770 1960 2160
Minimum tensile
Strength/(N/mm2)
A 1320 1520 1720 1910 2110
B - 1492 1682 1862 -
C - 1413 1593 1764 -
Note. When using other nominal tensile strength, the column tension is 50N/mm2 for the nominal tensile strength, and the column column is 5% for the nominal tensile strength.
The nominal tensile strength is reduced by 10% (repaired into an integer).
8.14.4 Bending of steel wire
The minimum number of bends of the wire shall comply with the requirements of Table 11.
8.14.5 Stretching and stretching of steel wire
For steel wires with a diameter less than 0.50 mm, the torsion and repeated bending tests are replaced by a steel wire knot tensile test.
9...
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