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GB 8903-2024 PDF English

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GB 8903-2024: Steel wire ropes for lifts
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GB 8903: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB 8903-2024English610 Add to Cart 0-9 seconds. Auto-delivery Steel wire ropes for lifts Valid
GB/T 8903-2018English1319 Add to Cart 5 days Steel wire ropes for lifts Obsolete
GB 8903-2005EnglishRFQ ASK 5 days [GB/T 8903-2005] Steel wire ropes for elevators Obsolete
GB 8903-1988English239 Add to Cart 2 days Steel wire ropes for elevators Obsolete

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GB/T 5224   GB/T 9944   GB/T 8919   GB/T 4357   

GB 8903-2024: Steel wire ropes for lifts

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.65 CCS H 49 Replacing GB/T 8903-2018 Steel wire ropes for lifts Issued on: JUNE 25, 2024 Implemented on: SEPTEMBER 25, 2024 Issued by. State Administration for Market Regulation; National Standardization Administration.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Classification and marking... 6 5 Ordering content... 7 6 Technical requirements... 7 7 Verification requirements and test methods... 17 8 Sampling and acceptance rules... 19 9 Usage information and marking... 20 Appendix A (Normative) Table of minimum breaking tensions of wire ropes of common categories, diameters, tensile strength levels... 22 Appendix B (Normative) Calculation of minimum breaking force of wire rope... 37 Appendix C (Informative) Reference weight per unit length of wire rope, nominal metal cross-sectional area, approximate diameter of outer steel wire... 38 Appendix D (Normative) Method for determining the elongation of wire rope... 39 Appendix E (Informative) Information on selection, storage, transportation, installation, maintenance of steel wire ropes for lifts... 41 Appendix F (Informative) Conditions for replacement and scrapping of wire ropes for lifts... 43 Steel wire ropes for lifts

1 Scope

This document specifies the classification and marking, ordering content, technical requirements, verification requirements and test methods, sampling and acceptance rules, usage information and identification of carbon steel smooth or plated wire ropes for lifts, which have nominal diameters of 6 mm ~ 38 mm and different structures. This document applies to suspension wire ropes for traction drive, hydraulic drive, forced drive lifts. It also applies to compensation wire ropes and speed limiter wire ropes for passenger lifts, freight lifts, sundries lifts running between guide rails.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document. 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 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 8358 Steel wire ropes - Determination of breaking force GB/T 8706 Steel wire ropes - Vocabulary, designation and classification GB/T 15030 Sisal main cores in steel wire ropes GB/T 21965 Steel wire ropes - Vocabulary for acceptance and defect NB/SH/T 0387 Wire rope greases YB/T 081 Rule for rounding off of numerical values and judgement of testing values for technical standards of metallurgy YB/T 4182 Steel wire ropes - Determination of lubricant content YB/T 4452-2015 Fiber cores for steel wire ropes YB/T 5198 Steel wire for lift ropes YB/T 5343 Steel wire for ropes

3 Terms and definitions

The terms and definitions as defined in GB/T 8706, as well as the following terms and definitions, apply to this document. 3.1 Single tensile rope A steel wire rope with the same tensile strength grade for the outer wire and inner wire of the outer strand (excluding the center wire and the filling wire). 3.2 Dual tensile rope A steel wire rope with different tensile strength grades for the outer wire and inner wire of the outer strand (excluding the center wire and the filling wire). Example. 1370/1770 grade means that the tensile strength grade of the outer wire of the outer strand is 1370, whilst the tensile strength grade of the inner wire is 1770. 3.3 Steel-based composite core; SCC A rope core made of steel wire and fiber or polymer composite. 3.4 Composite steel core; CSC A type of steel-based composite core, which is a rope core made by twisting steel strands with fiber core or polymer core.

4 Classification and marking

The classification and marking of wire ropes shall comply with the requirements of GB/T 8706.

5 Ordering content

The contract for ordering according to this document shall include the following. a) Quantity, in meters (m); b) Nominal diameter, in millimeters (mm); c) Deviation requirement category (only applicable to steel core wire rope); d) Wire rope category or structure; e) Surface condition; f) Strength level or minimum breaking tension; g) Twisting type; h) Rope core type, fiber core oil content category; i) Application. 1) Suspension wire rope, 2) Speed limiter wire rope, 3) Compensation wire rope; j) Others (if any).

6 Technical requirements

6.1 Materials 6.1.1 Steel wire 6.1.1.1 Steel wire properties and strength levels The properties and strength levels of steel wire used for rope making shall comply with the requirements of Table 1. 6.1.1.2 Surface condition Unless otherwise required by the buyer, the wire rope shall be made of smooth steel wire. When the buyer has plating requirements, it shall be indicated in the contract or order. - Polyester or polyamide. Composite fiber cores may be composited by sisal fiber with one or more of the above materials; The oil content of synthetic fiber cores and composite fiber cores in suspension wire ropes is divided into two categories. When measured according to the method of YB/T 4182, it shall be 3% ~ 10% for category I and 8% ~ 16% for category II. The oil content of synthetic fiber core and solid polymer core in speed limiter wire rope and compensation wire rope is divided into two categories, where category I has low oil content, which shall not be greater than 10%; category II has high oil content, which shall be 10% ~ 20%. c) The grease used to make the fiber core shall be compatible with the grease used to twist the wire rope. d) When natural fiber core wire rope is selected as speed limiter wire rope and compensation wire rope, the influence of environmental humidity and temperature changes in the use area shall be considered, to avoid abnormal expansion and contraction of the wire rope, resulting in lift failure. 6.1.2.3 Wire core The type of wire core shall be one of the following categories. a) Independent wire rope core (IWRC); b) Parallel lay compact rope core (PWRC); c) Wire strand core (WSC). The specific structure of each wire core is determined by the manufacturer based on the use conditions. 6.1.2.4 Steel-based composite core Typical steel-based composite cores include composite steel core (CSC) and polymer- coated steel core (EPIWRC). The synthetic fibers or polymers in the steel-based composite core shall be made of one or more of the following materials. - Polypropylene; - Polyethylene; - Polyester or polyamide. 6.1.3 Grease The grease for wire rope shall comply with the provisions of NB/SH/T 0387 for lubricants for wire ropes for lifts. 6.2 Wire rope manufacturing 6.2.1 General All steel wires in the same layer of wire rope shall have the same twist direction; all steel wires in the same layer of any strand shall have the same tensile strength level. Under tension on the rope closing machine, uniform gaps are allowed between the outer strands of the wire rope. The wire rope shall be twisted evenly and tightly. Except for parallel-twisted dense wire ropes and wire ropes with more than 9 strands in the outer layer, other wire ropes shall not be loose when inspected according to the method of 7.7. The steel wire rope shall not have manufacturing defects specified in GB/T 21965. Indentations of the steel wire caused by compression of the deformation tool are allowed. In the uncoiled unloaded state, the steel wire rope shall not be wavy. For plated steel wire ropes, all steel wires shall be plated. 6.2.2 Steel wire joints For steel wires with a diameter greater than 0.40 mm, butt welding shall be used for joints. For steel wires with a diameter less than or equal to 0.40 mm, butt welding or inserting the steel wire into the correct forming position in the strand can be used for joints. The distance between any two steel wire joints in the strand shall not be less than 10 m. 6.2.3 Fiber rope core joints Fiber rope core joints shall be spliced and braided; the diameter of the joint shall meet the allowable deviation requirements. The splicing length shall not be less than 30 times the nominal diameter of the fiber rope core. 6.2.4 Oiling For suspension wire ropes, speed limiter wire ropes, compensation wire ropes, all strands shall be oiled during the twisting process; they shall not be oiled when the ropes are finally tied. 6.2.9 Wire rope strength level 6.2.9.1 General The wire rope strength level is expressed by the strength level of the outer wire and inner wire of the outer strand, including single tensile rope and dual tensile rope. The commonly used strength level of the wire rope shall be one of 6.2.9.2 ~ 6.2.9.4.Other wire rope levels shall be determined by negotiation between the buyer and the manufacturer. For commonly used categories of wire ropes (see Table A.1 ~ Table A.11), Rr is the equivalent value for calculating the minimum breaking tension of single tensile ropes; Rdt is the equivalent value for calculating the minimum breaking tension of dual tensile ropes. The Rdt value is as shown in Appendix B. 6.2.9.2 Suspension wire ropes The strength levels of commonly used categories of wire ropes for traction-driven lifts are in accordance with Table A.1 ~ Table A.8. The strength levels of commonly used types of wire ropes for hydraulic-driven and forced-driven lifts are in accordance with Table A.1 ~ Table A.4. Other structural wire ropes not included in Appendix A. - Multi-layer polymer coated steel core wire rope. 1570/1770, 1620/2160, 1570, 1770, 1960, 2160; - Compacted strand wire rope. 1570/1770, 1620/2160, 1570, 1770, 1960, 2160. 6.2.9.3 Speed limiter wire rope The strength level of the speed limiter wire rope shall be in accordance with Table A.1 ~ Table A.9. 6.2.9.4 Compensation wire rope The strength level of the compensation wire rope shall be in accordance with Table A.1 ~ Table A.11. 6.2.10 Twist type The twist type of the wire rope shall be one of the following, as shown in Figure 1. a) Right alternating lay (sZ); b) Left alternating lay (zS); of the nominal tensile strength of the steel wire of the same diameter specified in YB/T 5198 or YB/T 5343; c) The tensile strength of the low-value steel wire shall not be lower than 92% of the lower limit of the nominal tensile strength of the steel wire of the same diameter specified in YB/T 5198 or YB/T 5343. 6.6.3 Repeated bending At least 95% of the test wires shall be subjected to the number of repeated bending in accordance with the provisions of YB/T 5198 or YB/T 5343 for important purpose wires. The number of repeated bending of low-value wires shall not be less than 80% (rounded to an integer) of the number specified in the corresponding standards. 6.6.4 Knotting tension For wires with a diameter of less than 0.50 mm, the knotting tensile test shall be used instead of the bending test. At least 95% of the test wires shall be subjected to repeated bending in accordance with the provisions of YB/T 5198 or YB/T 5343.The knotting tensile force of low-value wires shall not be less than 80% (rounded to an integer) of the value specified in the corresponding standards. 6.6.5 Plating weight At least 95% of the test steel wires shall comply with the provisions of Grade B plated steel wire in YB/T 5198 or YB/T 5343.The plating weight of low-value steel wires shall not be less than 80% of the specified value (rounded to an integer). 6.6.6 Calculation of low-value steel wires When the number of low-value steel wires allowed is less than 1, it shall be calculated as 1.When there are multiple low values in the test of 1 steel wire, only 1 is calculated. 6.7 Elongation When measured according to the method in Appendix D, the elongation of the suspension wire rope shall meet the following requirements. a) The structural elongation of fiber core steel wire rope shall not be greater than 0.60%; the elastic elongation shall not be greater than 0.25%; b) The structural elongation of steel core and steel-based composite core steel wire rope shall not be greater than 0.45%; the elastic elongation shall not be greater than 0.20%. 6.8 Measured weight per unit length

Appendix E

(Informative) Information on selection, storage, transportation, installation, maintenance of steel wire ropes for lifts E.1 Selection The hardness of the rope groove of the traction sheave shall match the hardness of the steel wire rope. In particular, when the strength level of the outer layer of the steel wire rope used reaches or exceeds 1770 MPa, the surface of the traction sheave groove shall be hardened or made of matching hard materials, such as QT-700 or equivalent. The diameter of the sheave groove of the traction sheave shall match the diameter of the steel wire rope. When designing the lift, the deflection angle should not be too large, to prevent eccentric wear of the steel wire rope, which will reduce the life of the steel wire rope. E.2 Storage The steel wire rope should be stored in a ventilated and dry place, avoiding rain, immersion, exposure to humid environment, direct sunlight, contact with acid and alkali, to prevent rust, grease loss, surface damage, shortening the life of the steel wire rope and continuous elongation of the natural fiber core steel wire rope after installation due to moisture. E.3 Transportation During loading and unloading, ensure that the wire rope is not damaged by forklift or falling. During transportation, the wire rope shall be kept away from rain or exposure to humid environment. It can be contained in a container or covered with waterproof material. E.4 Installation During installation, avoid surface damage of the wire rope and excessive forward and reverse rotation, to prevent shortening the life of the wire rope. The following methods of releasing the rope are recommended. a) For wire rope coiling, use a coiling pay-off rack, as shown in Figure E.1; b) For wire rope on the shaft, use a wheel axle pay-off rack, as shown in Figure E.2.

Appendix F

(Informative) Conditions for replacement and scrapping of wire ropes for lifts F.1 General In general, lift wire ropes are scrapped mainly because of broken wires and wear; however, other factors such as diameter reduction, corrosion or excessive elongation can also cause lift ropes to be scrapped. When conducting inspections, maintenance personnel need to consider all these factors, to decide whether a set of wire ropes is suitable for continued use or shall be scrapped. Even if only one wire rope reaches the scrap condition, the entire set of wire ropes must be replaced together, unless in special circumstances where the wire rope is damaged during installation or acceptance before the normal delivery of the lift, it can be replaced separately (see F.6). When the traction sheave or traction machine is replaced as a whole, the traction wire rope used must also be replaced at the same time. F.2 ~ F.5 are general scrapping guidelines for lift wire ropes. When used, they can be referred to the relevant national lift maintenance specifications and standards. For wire ropes that are not running in cast iron or cast steel pulleys, maintenance personnel must be aware that the possibility of early internal damage to the wire rope is greater than the possibility of obvious external damage. F.2 Broken wires The number of visible broken wires at the worst part of the wire rope given in Table F.1 is the criteria for the number of visible broken wires for replacement or special inspection and replacement of wire ropes used during lift operation and scrapping of wire ropes. It is applicable to commonly used suspension wire ropes, speed limiter wire ropes, compensation wire ropes. For other types of wire ropes, they can be replaced or scrapped in accordance with the requirements of relevant national lift maintenance specifications and standards. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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