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GB 8903-2024 PDF English (GB/T 8903-2018: Older version)Search result: GB 8903-2024 (GB/T 8903-2018 Older version)
GB8903-2024: PDF in EnglishGB 8903-2024 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 includ.......Source: https://www.ChineseStandard.net/PDF.aspx/GB8903-2024 |