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[GB/T 8918-2006] Steel wire ropes for important purpose
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GB 8918-2006: [GB/T 8918-2006] Steel wire ropes for important purpose
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB8918-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing relevant parts of GB/T8918-1996
Steel wire ropes for important purposes
(ISO 3154.1988, Stranded wire ropes for mine hoisting -- Technical delivery requirements,
MOD)
Since March 23, 2017, this Standard has been converted to a recommendary standard and its number
was changed to GB/T 8918-2006.
Issued on: MARCH 01, 2006
Implemented on: SEPTEMBER 01, 2006
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Classification... 6
4 Ordering content... 8
5 Wire rope material... 9
6 Technical requirements... 9
7 Inspection and test... 17
8 Acceptance... 20
9 Packaging, marks and quality certificate... 21
Annex A (normative)... 47
Annex B (informative)... 49
Annex C (informative)... 52
Annex D (informative) Recommended main uses of steel wire rope... 54
Steel wire ropes for important purposes
1 Scope
This Standard specifies the classification, ordering information, materials, technical
requirements, inspection and test, acceptance methods, packaging, marks, and quality
certificates for steel wire ropes for important purposes.
This Standard applies to round and irregularly shaped wire ropes used in mine hoisting,
blast furnace winches, large-scale casting, oil drilling, large-scale lifting, heavy lifting,
cableways, ground cable cars, ships and offshore facilities.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to this
Standard. However, the parties who enter into agreement based on this Standard are
encouraged to investigate whether the latest versions of these documents are applicable.
For undated reference documents, the latest versions apply to this Standard.
GB/T 228, Metallic materials -- Tensile testing at ambient temperature (GB/T 228-
2002, ISO 6892.1998, eqv)
GB/T 238, Metallic materials -- Wire -- Reverse bend test (GB/T 238-2002, ISO
7801.1984, idt)
GB/T 239, Metallic materials – Wire -- Torsion test (GB/T 239-1999, ISO 7800.1984,
ISO 9649.1990, eqv)
GB/T 2104, Steel wire ropes -- Packing, marking and certificate -- General
requirements
GB/T 2973, Zinc coated steel wire -- Test method for gravimetric determination of
zinc coating
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 8358, Method of breaking tensile test for steel wire rope (GB/T 8358-1987,
ISO 3108.1974, eqv)
GB/T 8706, Steel wire ropes -- Terminology (GB/T 8706-1988, ISO 2532.1974, eqv)
GB/T 8707, Steel wire ropes -- Standard designations (GB/T 8707-1988, ISO
3578.1980, idt)
GB/T 8919, Wire for steel wire ropes use
GB/T 15030, Sisal wire rope core
YB/T 081, Rule for rounding off of numerical values and judgement of testing values
for technical standards of metallurgy
SH/T 0387, Surface Grease for Steel Wire Ropes
SH/T 0388, Hemp Core Grease for Steel Wire Ropes
3 Classification
3.1 Wire ropes are classified according to the cross-section of their strands, the number
of strands, and the number of outer layer wires, as shown in Table 1.For round strand
and irregular strand wire ropes, if the purchaser does not explicitly require a specific
structure, the supplier shall determine the structure within the same group.
Groups 10~12 and 14 of irregularly shaped wire ropes are all-directionally twisted. The
inner and outer strands of Group 14 wire rope shall have opposite strand directions, and
the inner strands shall be all-directionally twisted.
3.2 Wire ropes are classified into four types based on their twist method. right-hand
cross-twist, left-hand cross-twist, right-hand same-direction twist, and left-hand same-
direction twist, as shown in Figures 1~4.In Figures 1 and 2, the rope and strand twist
directions are opposite. In Figures 3 and 4, the rope and strand twist directions are the
same.
3.3 The marking codes for wire ropes shall conform to the provisions of GB/T 8707.
The strand structure shall be marked from the center outwards.
4 Ordering content
Contracts for orders placed in accordance with this standard shall include the following
main contents.
a) Standard number;
b) Product name;
c) Structure (marking code);
d) Nominal diameter;
e) Twist method;
f) Surface condition;
g) Nominal tensile strength;
h) Quantity (length);
i) Application;
j) Other requirements.
5 Wire rope material
5.1 Steel wire for rope making
5.1.1 The steel wire used for rope making shall comply with the requirements for steel
wire for important purposes in GB/T 8919.
5.1.2 The steel wire used for rope making includes core wire and filler wire (excluding
low carbon steel wire, filler wire and reinforcing wire that make up the triangular core).
5.2 Rope core
The core of a wire rope is divided into fiber core and steel core.
5.2.1 Fiber core
The fiber core shall conform to the requirements of GB/T 15030 or be made of jute,
synthetic fibers, or other fibers that meet the requirements. Unless otherwise required
by the purchaser, the fiber core shall be impregnated with a lubricating grease that has
anti-corrosion and anti-rust properties.
5.2.2 Steel core
The steel core is divided into independent wire rope core (IWR) and wire strand core
(IWS).
5.3 Grease
The grease used for wire ropes shall comply with the requirements of SH/T 0387 or
other relevant requirements.
The core resin shall comply with the requirements of SH/T 0388 or other relevant
regulations.
6 Technical requirements
6.1 Strand
6.1.1 The strands shall be twisted evenly and tightly.
6.1.2 The core strand and fiber core shall provide sufficient support to ensure uniform
twisting of the outer twisted wires. Uniform gaps are allowable between adjacent wires
within a strand. For strands and ropes made of wires of the same diameter, the central
wire and central strand shall be appropriately enlarged.
6.2 Steel wire rope
6.2.1 Twisting
6.2.1.1 The wire rope shall be evenly, tightly, and without looseness. It shall not be
wavy when unloaded or under no-load conditions. The wires in the rope shall not have
defects such as crossing, bending, or broken wires, but flattening of the wires due to the
clamping of the deformation tool is allowable.
6.2.1.2 When manufacturing wire ropes, wires of the same diameter shall have the same
nominal tensile strength. Wires of different diameters are allowed to use the same or
adjacent nominal tensile strengths, but the minimum breaking strength of the wire rope
shall comply with the relevant provisions in Tables 9~23.
6.2.1.3 The core of the wire rope shall provide sufficient support to ensure that the outer
strands are twisted evenly. A relatively uniform gap between adjacent strands is
allowable.
6.2.1.4 All wires in a galvanized steel wire rope shall be galvanized.
6.2.1.5 The number of splices in the wire rope shall be minimized. When splicing wires,
butt welding shall be used. During the same twisting of the strand, the distance between
each splice point within the strand shall not be less than 10 m.
6.2.2 Applying oil
Unless otherwise required by the purchaser, the wire rope shall be uniformly and
continuously coated with anti-rust lubricating grease. If the purchaser requires the wire
rope to have anti-friction properties, the wire rope shall be coated with anti-friction
grease.
6.2.3 Diameter
6.2.3.1 Nominal diameter D
The nominal diameter of the wire rope shall conform to the provisions of Tables 9~23.
6.2.3.2 Measured diameter
The measured diameter of the wire rope is the diameter obtained according to the
method specified in Clause 7.1.1.The deviation is. for round strands; for
irregular strands.
6.2.3.3 Out-of-roundness
The out-of-roundness of the wire rope shall not exceed 4% of the nominal diameter of
the wire rope.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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