Standard No.:	YB/T 4251-2011
English Name:	Steel wire ropes for lift door operator
Chinese Name:	电梯门机用钢丝绳
Chinese Classification:	H49    Steel wire and wire rope
Professional Classification:	YB    Professional Standard - Metallurgy
ICS Classification:	77.140.65 77.140.65    Steel wire, wire ropes and link chains 77.140.65
Issued by:	Ministry of Industry and Information Technology
Issued on:	2011-12-20
Implemented on:	2012-7-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	3500 words
Price(USD):	204.0
Delivery:	via email in 1 business day

Steel wire ropes for lift door operator 1 Scope This standard specifies the minimum technical requirements for the production and inspection of steel wire ropes for lift door operator. 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 1839 Zinc coated steel wire test method for gravimetric determination of zinc coating (GB/T 1839-2009, ISO 1460: 1992, MOD) GB/T 2104 Steel wire ropes - Packing, marking and certificate - General requirements GB/T 4354 Hot rolled quality carbon steel wire rods GB/T 8358 Method of breaking tensile test for steel wire rope (GB/T 8358-2006, ISO 3108: 1974, NEQ) GB/T 8706 Steel wire ropes - Vocabulary, designation and classification (GB/T 8706-2006, ISO 17893: 1974, IDT) GB/T 12347 Steel wire ropes - Bending fatigue testing GB/T 21965 Steel wire ropes - Vocabulary for acceptance and defect (GB/T 21965-2008, ISO 2532: 1974, NEQ) SH/T 0387 Surface grease for steel wire ropes 3 Terms and definitions For the purposes of this standard, the terms and definitions given in GB/T 8706 apply. 4 Classification 4.1 The steel wire rope structure is classified into 6×7-WSC and 6×19-WSC. 4.2 The designation of steel wire ropes shall meet the requirements of GB/T 8706.

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 Order information 6 Materials of steel wire ropes 7 Technical requirements 8 Inspection and test 9 Inspection rules 10 Packing, marking and quality certificate

*GB/T 1839-2008 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products
*GB/T 2104-2008 Steel wire ropes - Packing，marking and certificate - General requirements
*GB/T 4354-2008 Hot rolled quality carbon steel wire rods
*GB/T 8358-2014 Steel wire ropes—Determination of measured breaking force
*GB/T 8706-2017 Steel wire ropes-Vocabulary,designation and classification
*GB/T 12347-2008 Steel wire ropes - Bending fatigue testing
*GB/T 21965-2020
*SH/T 0387-1992 Surface Grease for Steel Wire Ropes