GB 8918-2006 PDF English
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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
PEOPLE'S REPUBLIC OF CHINA
GB 8918-2006
Replacing GB/T 8918-1996
Steel Wire Ropes for Important Purposes
(ISO 3154:1988, Stranded wire ropes for mine hoisting-Technical delivery
requirements, MOD)
IMPLEMENTED ON: SEPTEMBER 1, 2006ISSUED ON: MARCH 1, 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.
GB
Foreword
The standard is modified from ISO 3154:1988 "Stranded wire ropes for mine hoisting-Technical
delivery requirements", the comparison schedule of the national standard clauses and the
international standard clauses are listed in the Appendix B.
Because the national law requirements and the industrial special needs, the national standard is
amended when the international standard is adopted. These technical differences are marked with
the vertical single line the page margin in the involved clauses. The technical difference and its
cause schedule are presented in Appendix C for your reference.
The national standard is compulsory standard. Therein, clauses 5,6.1, 6.2.1, 6.2.2, 6.2.3, 6.2.4,
6.2.6, 6.2.8, 6.3, 6.5, 7.1.1, 7.1.4, 7.1.6, 7.1.7, 7.2, 7.3, 7.4, 7.5, 8, 9 are compulsory clauses.
The standard still made the following compilation amendment.
a) The international standard is changed into "the national standard". b) The comma ", " as dot is
replaced by ".".
c) The preface of the international standard is deleted.
The corresponding proportion of GB/T 8918-1996 Steel wire ropes is replaced by the national
standard.
In comparison with GB/T 8918- 1996, the technology content change as follows:
- Structure of wire rope, delete Class 6×19(b),6×37(b),18×19 and 6×24, Class 35W×7 is increased,
and the 18×19W and 18×19S is separated from Class 18× 7, and listed as one class.
- Cancel method 2 in the acceptance method (measure aggregate breaking force).
- The lower limit of the steel wire nominal diameter is increased to 0.6 mm.
- Certain kind structure steel wire rope diameter range lower limit is improved properly.
-The allowable deviation upper limit of the steel wire rope diameter is reduced 1%.
- out-of-roundness calculation method is changed and the out-of-roundness allowable value with
fiber strand core and shaped strand wire ropes is decreased to 4% from 6%.
- Strand dismantlement steel wire nominal tensile strength: the lower limit of the polished surface
and Class B galvanized steel wire canceled 1470 MPa. the upper limit improved one nominal
tensile strength level to 1960 MPa. The lower limit of galvanized wire canceled 1470 MPa level.
The upper limit improved one nominal tensile strength to 1870 MPa level. Class A galvanized
wire lower limit canceled 1370 and 1470 MPa level. The upper limit improved two nominal
tensile strength level to 1870 MPa level.
- The strand dismantle steel wire strength allowable error check is increased and the strand
dismantle steel wire tensile strength lower limit is steel wire nominal tensile strength.
Steel Wire Ropes for Important Purposes
1 Scope
The national standard prescribes the classification, order content, material, technical requirement,
inspection and test, acceptance method, packing, label and quality certificate of steel wire ropes
for important purposes.
The national standard is applicable to the round strand and shaped strand wire ropes for mine
hoisting, blast furnace winding, large-scale moulding, petroleum drilling, large-scale hoisting,
heavy hoisting, ropeway, floor cable car, shipping and offshore facility.
2 Normative References
The following documents contain contents which, through reference in this text, composite
provisions of this standard. For dated reference, subsequent amendments (excepting corrigenda
content) to, or revisions of, any of these publications do not apply. Parties to agreements based
on this standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. For undated references, the latest edition of the
normative document referred to applies.
GB/T 228 Evaluation of Measurement Uncertainty of Tensile Test for Metal (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 weight of zinc coating
GB/T 8170 Rules for rounding off of numberical values
GB/T 8358 Method of breaking tensile test for steel wire ropes (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 rope－Standard designations (GB/T 8707-1988, ISO 3578:1980, idt)
GB/T 8919 Steel Wire for Rope
GB/T 15030 Steel wire ropes－Sisal main cores
5 Steel wire rope materials
5.1 Steel wire for rope
5.1.1 The steel wire for ropes shall conform to the prescription of the GB/T 8919 Steel wire
ropes for important purposes.
5.1.2 The steel wire for ropes includes the strand core wire and filling wire (exclusive of
the low-carbon steel wire, filling wire and edge-patching).
5.2 Rope core
Wire rope core is divided into fiber core and steel core.
5.2. 1 Fiber core
Fiber core shall be made from the GB/T15030 prescribed fiber or jute and
synthetic fiber and other conforming to requirements. Except the demand party has
requirements, the fiber core shall be saturated with lubricant grease with corrosion
protection and anti-tarnish performance.
5.2.2 Steel core
The steel core is divided into independent wire rope core (IWR) and independent
wire rope strand core (IWS).
5.3 Grease
The steel wire rope grease shall conform to prescription of SH/T 0387 or miscellaneous
related requirements.
The hemp core grease shall conform to prescription of SH/T 0388 or miscellaneous related
requirements.
6 Technical requirements
6. 1 Strand
6.1.1 The strand shall be twisted in uniformity and tightness.
6.1.2 The strand core wire and strand fiber core shall possess adequate support effect so as
to make the outer layer twisted steel wire be able to uniform twisting; the adjacent
steel wire in strand is allowed to have even clearance. The strand and rope steel core
made from steel wire with the same diameter, its central steel wire and the central
strand shall be increased properly.
6.2 Steel wire rope
6.2. 1 Twist
6.2.1.1 The wire rope shall be twisted in uniformity and tightness and shall not be
loose. In the spreading and no-load condition, the wave shape can't be
presented. The steel wire in the rope shall not have any defect like
overlapping, folding and broken wire. The steel wire squashing
phenomenon resulting from the clamp compaction operation is allowed.
6.2.1.2 In the wire rope manufacturing, the steel wire with same diameter shall be the
identical nominal tensile strength. The identical or adjacent nominal
tensile strength shall be adopted for steel wire with the different diameter.
The wire rope's minimum fracture tensile force shall conform to relevant
regulations in Table 9-13.
6.2.1.3 The wire rope wire shall possess adequate support effects so as to make the
outer layer twisted strand be able to uniform twisting. The adjacent steel
wire in strand is allowed to have even clearance.
6.2.1.4 All steel wires in galvanized wire rope shall be galvanized.
6.2.1.5 The steel wire junctions in the wire rope shall be minimized as far as possible.
In the steel wire junction, the butt welding connection shall be adopted. In
the same twisting of the strand, the distance of connection point in the
strand shall not be less than 10m.
6.2.2 Oil
Unless the demand party has special requirement, the wire rope shall be evenly oiled
with antirust lubricant grease. If the demand requires the wire rope friction performance,
the friction lubricant grease shall be oiled on the wire rope.
6.2.3 Diameter
6.2.3.1 Nominal diameter D
Wire rope nominal diameter shall conform to prescription from Table 9-Table
23.
6.2.3.2 Actual measurement diameter
The wire rope actual measurement diameter is the diameter which is measured
by the prescriptive method of 7.1.1. Its deviation is 0
%5+
and 0
%6+
for
round strand and shaped strand wire ropes respectively.
10
6.2.6 Broken tensile force
The wire rope actual measurement broken tensile force shall not be less than prescription
of Table 9-23. The minimum broken tensile force of the wire rope is expressed by kN
and it is calculated according to formula (2).
F0=K'·D2·R0/1000 (2)
Where,
Fo-The minimum broken tensile force of the wire rope, unit is kN.
D-Wire rope nominal diameter, unit is mm.
R0-Wire rope nominal tensile strength, unit is MPa.
K '-the minimum broken tensile coefficient of the certain appointed structural steel wire
(The K’ value, see Table 2).
Note: The minimum aggregate breaking force and wire rope minimum broken tensile force
conversion coefficient, see Appendix A.
6.2.7 Elongation
For wire ropes for mine hoisting, cableway and other special purposes, the permanent
elongation in service shall be negotiated by both parties.
6.2.8 Appearance
The wire rope appearance shall not have listed manufacturing defect in GB/T 8706.
6.3 Strand dismantlement steel wire
6.3.1 Actual measurement diameter
The steel wire actual measurement diameter shall conform to relevant regulations in
GB/T 8919 (the steel wire squashing because of clamps compaction is allowed to take
larger cross dimension as final).
6.3.2 Surface condition
The steel wire surface condition shall conform to prescription of Table 3.
6.3.3 Tensile strength
6.3.3.1 Nominal tensile strength
The nominal tensile strength of steel wire shall conform to prescription of
Table 3. The tensile strength in the Table is lower limit value. The upper limit
value is equal to the lower limit value plus the prescriptive margin tolerance in
Table 4.
17
7.2.3 Tensile force test
Tensile force test shall conform to prescription of GB/T 228.
7.2.4 Alternating bending test
Alternating bending test shall conform to prescription of GB/T 238.
7.2.5 Torsion testing
Torsion testing shall conform to prescription of GB/T 239.
7.2.6 Zinc coating testing
Steel wire zinc-coating layer testing shall conform to prescription of GB/T 2973.
7.2.7 Qualified condition
The steel wire rope strand dismantles steel wire shall conform to following
requirements:
a) The number of unqualified steel wire of any kind of diameter shall be no more than
one, or
b) If the number of unqualified steel wire of any kind of diameter is two or more than
two, the unqualified item test shall be done for miscellaneous steel wires with this
kind of diameter. If the number of unqualified steel wires is no more than 4% of
the steel wire number with the same diameter (rounding off whole number), the
steel wire rope is qualified.
If the same steel wire has many unqualified items, it is calculated according to one.
7.3 When one piece of steel wire rope is delivered by cutting into several pieces of steel wire
ropes, sampling test is carried out for any piece of the steel wire rope, others are free from
test. Otherwise, the test will be carried out for steel wire ropes one by one.
7.4 The steel wire rope mechanical property check
According to actual measurement steel wire rope broken tensile force, look up Table 9-23
and check nominal tensile strength for steel wire rope.
7.4.1 When the steel wire in the same steel wire rope has the same nominal tensile strength,
the steel wire rope nominal tensile strength id the same to nominal tensile strength of
the steel wire. When the steel wire in steel wire rope has different nominal tensile
strength, the steel wire rope nominal tensile strength shall conform to one of the
nominal tensile strength of steel wire.
36
Appendix C
(Informative Appendix)
Table C.1 The Technical difference and its cause of the national standard and ISO 3154:1988
The Chapter and
Article SN of the
national standard
Technical difference Cause
The classification, steel wire
rope material, technical
requirement, inspection and test,
acceptance method, packing,
label and quality certificate of
the standard prescribed Steel
Wire Ropes for Important
Purposes are increased.
The round strand and shaped
strand steel wire ropes for
large-scale moulding, petroleum
drilling, large-scale hoisting
crane, cableway bearing traction,
and cable car operation are
increased.
It is in accordance with prescription of GB/T
1.1.
The international standard is suitable for the
mine hoisting; the standard is suitable for
important purposes. Except the listed mine
hoisting, the other important purposes are
listed, it is clear.
Quote the national standard
which adopted the international
standard, not the international
standard.
The Chapter is increased, that is
classification
So as to adapt the situation of our country (the
international standard is presented in ISO
2408:2002))
The Chapter is increased, that is
order content
So as to adapt the situation of our country
5.1.2 The steel wire for ropes-making
is increased, including strand
core wire and filling wire.
So as to adapt the situation of our country
5.2.2 Increase steel core So as to adapt the situation of our country
6.1
6.1.1-6.1.2
Increase the strand twisting
requirements
So as to adapt the situation of our country (the
international standard presented in ISO
2408-2002))
6.2.1, Increase the steel wire rope So as to adapt the situation of our country (the
38
and diameter allowable
deviation is replaced by the steel
wire for rope-making national
standard.
definitely prescribe the steel wire nominal
diameter and diameter allowable deviation.
6.3.2 The steel wire surface condition
is polished surface and Class B
zinc coating, Class AB
zinc-coating and Class A
zinc-coating is increased.
It is clearer; Adapt the situation of our
country.
6.3.2.1 The nominal tensile strength for
1670, 1870 MPa Class steel wire
is increased.
Adapt the situation of our country.
6.3.3, 6.3.4,
6.3.5.2
Adapt the situation of our country.
6.3.6.1 The Class AB zinc-coating layer
weight is increased.
Adapt the situation of our country.
6.4 The appearance requirement is
increased.
Adapt the situation of our country.
7.1.3 The weighing apparatus measure
is increased.
More definite
7.1.4 . Delete measuring method of
actual measurement broken
tensile force sum.
”Delete” sample length, sample,
test, testing operation, broken
point, elongation measure" for
steel wire rope broken tensile
force measure.
Measure steel wire rope broken tensile force,
steel wire tensile force is not only measured,
the steel wire rope twisted quality level shall
be checked. It is able to guarantee practical
use performance of the steel wire rope. The
measurement for aggregate breaking force is
not able to reflect the twisted quality level.
The definite prescription for sample, testing
machine and test operation are defined in
"steel wire rope broken tensile force test
method standard".
7.1.5 The mutual agreement for steel
wire rope measuring elongation
is increased.
Adapt the situation of our country.
7.1.6 The non- loosening inspection is
increased.
The non loosening can improve service life
and safety; adapt the situation of our country.
7.1.7 The visual inspection is
increased.
Adapt the situation of our country.
7.2.1.1 Select a certain proportion
number of strands and dismantle
them into steel wire, this is
adopted to do test, the original
test method of selecting 16% of
No matter select a certain proportion sample
from the dismantling steel wire rope; or select
a certain number of strands dismantling steel
wire doing test, its representativeness is the
same. It is random sampling. The working
39
the dismantling steel wire rope
is replaced by this.
quantity of the inspector can be decreased.
7.2.7
Delete the acceptance condition
of test method adopting
aggregate breaking force
Delete test method for aggregate breaking
force
7.3 The multiple lengths productive
sampling method is increased.
Adapt the situation of our country.
7.4 The check method for steel wire
rope mechanical property is
increased.
Be in favor of manufacturer unification,
design and user's comprehension and
acceptance.
8.2 The acceptance testing
department, acceptance basis
and acceptance period of the
demand party are increased.
Let the demand party clear and avoid
unnecessary trouble.
9 It is listed in the international
standard. The standard is
implemented according to
national standard.
The national standard has definite
prescription for packing, label and quality
certificate.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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