MT/T 716-2019 English PDF (MTT716-2019)

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MT/T 716-2019: Technical delivery requirements of steel wire ropes for coal mine hoisting
MT/T 716-2019
MT
NATIONAL COAL INDUSTRY OF THE
PEOPLE’S REPUBLIC OF CHINA
Replacing MT/T 716-2005
Technical delivery requirements of steel wire ropes for coal
mine hoisting
ISSUED ON: DECEMBER 29, 2018
IMPLEMENTED ON: JULY 01, 2019
Issued by: State Coal Mine Safety Supervision Bureau
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Wire rope material ... 6
4 Requirements ... 7
5 Inspection and testing ... 20
6 Inspection rules ... 24
7 Packaging, marking, quality certificates and safety signs ... 26
Annex A (normative) Wire rope twist quality and surface quality ... 27
Technical delivery requirements of steel wire ropes for coal
mine hoisting
1 Scope
This document specifies the requirements for acceptance, pre-hanging inspection,
inspection and testing, inspection rules, packaging, marking, quality certificates and
safety signs, etc. of steel wire ropes for coal mine hoisting.
Steel wire ropes for coal mine hoisting include: shaft hoisting wire ropes, inclined shaft
hoisting wire ropes, hanging hoist wire ropes, inclined wire ropes for transporting
personnel, traction belt conveyor wire ropes and tilted stepless rope winch wire ropes
and wire ropes for overhead passenger installations.
This Standard applies to various round strand wire ropes, special-shaped strand wire
ropes and compacted strand wire ropes for coal mine hoisting.
This Standard does not apply to balancing flat wire ropes and sealed wire ropes.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1, Metallic materials -- Tensile testing -- Part 1: Method of test at room
temperature
GB/T 238, Metallic materials -- Wire -- Reverse bend test
GB/T 239.1, Metallic materials -- Wire -- Part 1: Simple torsion test
GB/T 1839, Test method for gravimetric determination of the mass per unit area of
galvanized coatings on steel products
GB/T 2104, Steel wire ropes -- Packing, marking and certificate -- General
requirements
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 8358, Steel wire ropes -- Determination of breaking force
GB/T 8706, Steel wire ropes -- Vocabulary, designation and classification
GB/T 8918, Steel wire ropes
GB/T 8919, Wire for steel wire ropes use
GB/T 15030, Sisal wire rope core
GB/T 21965, Steel wire ropes -- Vocabulary for acceptance and defect
AQ 1043, Mining Products Safety Label
YB/T 5343, Steel wire for ropes
YB/T 5359, Compacted strand ropes
NB/SH/T 0387, Wire rope greases
Coal Mine Safety Regulations (Edition 2016)
3 Wire rope material
3.1 Steel wire for rope making
The steel wire used for rope making shall comply with the requirements for important
purpose steel wire in GB/T 8919. Compacted strand wire rope wires shall comply with
the requirements for important purpose steel wires in YB/T 5343.
3.2 Rope core
3.2.1 Fiber core
The fiber core shall comply with the requirements of GB/T 15030 or be made of jute,
synthetic fiber or other fibers that meet the requirements. Unless otherwise required by
the purchaser, the fiber core shall be soaked with lubricating grease with anti-corrosion
and anti-rust properties.
3.2.2 Steel core
The steel core is divided into independent steel wire rope core [IWR, IWRC, IWRC(K)],
compacted strand parallel twisted steel wire rope core [PWRC(K)] and steel wire strand
core (IWS, WSC). For compacted strand steel wire ropes, if the purchaser has no special
requirements, the supplier shall determine whether the steel core is a compacted strand
core.
3.3 Grease
Unless otherwise required by the purchaser, the surface of the wire rope shall be evenly
and continuously coated with anti-rust lubricating grease. When the purchaser requires
the steel wire rope to have friction-increasing performance, the steel wire rope shall be
coated with friction-increasing grease and there shall be no leakage.
The grease and hemp core grease used for steel wire ropes shall comply with NB/SH/T
0387 or other relevant requirements.
4 Requirements
4.1 Basic requirements
4.1.1 Wire ropes shall have mining product safety signs.
4.1.2 Wire ropes shall have quality certificates. Among them, the requirements for steel
wire ropes shall comply with the implementation standards and requirements for safety
signs of mining products.
4.1.3 After the new wire rope arrives, it shall be inspected for performance according
to this Standard and can only be used after passing the test.
4.1.4 Steel wire ropes stored for more than 1 year shall be tested again according to this
Standard before being hung, and can only be used after passing the test.
4.1.5 The safety factor when hanging wire ropes for various purposes (the ratio of the
measured sum of the breaking tension of qualified steel wires to the maximum static
tension it bears) shall comply with the relevant provisions of the "Coal Mine Safety
Regulations".
4.2 Requirements for wire ropes
4.2.1 Diameter
4.2.1.1 Nominal diameter
The nominal diameter shall comply with the requirements of GB/T 8918 and YB/T
5359, otherwise it shall be agreed upon by both parties. The nominal diameter shall be
indicated on the wire rope quality certificate.
4.2.1.2 Diameter deviation and out-of-roundness
Diameter deviation and out-of-roundness are shown in Table 1.
breaking tension of the steel wire and the corresponding conversion factor between the
sum of the minimum breaking tension of the steel wire and the minimum breaking
tension of the steel wire in GB/T 8918 or the product of the conversion factor
corresponding to the sum of the minimum breaking tensile forces in the table of
mechanical property in YB/T 5359.
NOTE: When the typical structure of the wire rope is inconsistent with GB/T 8918 or YB/T 5359,
the minimum total wire breaking tension confirmed by the mining product safety mark shall be
followed.
4.2.7.2.2 Method 2 -- Wire rope breaking tension
The measured breaking force of the wire rope shall not be less than the minimum
breaking force of the wire rope corresponding to the nominal tensile strength of the wire
rope in the mechanical property table of GB/T 8918 or the mechanical property table
of YB/T 5359.
NOTE: When the nominal diameter and nominal tensile strength of the wire rope are inconsistent
with the mechanical properties table of GB/T 8918 or YB/T 5359, the minimum breaking tension
of the wire rope shall be calculated according to the method of GB/T 8918 or YB/T 5359. When the
typical structure of the steel wire rope is inconsistent with GB/T 8918 or YB/T 5359, and the
minimum breaking tension of the steel wire rope confirmed by the mining product safety mark is
greater than the calculated value, the minimum breaking tension of the steel wire rope confirmed by
the mining product safety mark shall be followed.
4.3 Requirements for split steel wire
4.3.1 General
Remove the steel wire from the wire rope specimen. The tensile strength, breaking
tension, repeated bending and torsion of the steel wire are assessed based on the
nominal tensile strength and nominal diameter of the steel wire. Or take steel wires with
the same nominal diameter as a group (the nominal diameter of the steel w...