Standard No.:	YB 4068-1991
English Name:	Hot-rolled ring
Chinese Name:	热轧环件
Chinese Classification:	H44    Profile steel and deformed steel
Professional Classification:	YB    Professional Standard - Metallurgy
Issued by:	Ministry of Metallurgical Industry
Issued on:	1991-9-18
Implemented on:	1992-1-1
Status:	abolished
Abolished on:	2023-11-03
Language:	English
File Format:	PDF
Word Count:	3500 words
Price(USD):	105.0
Delivery:	via email in 1 business day

1 Subject content and application scope This standard specifies the dimensions, shapes, weights and permissible deviations, technical requirements, test methods, inspection rules, marking and quality certificate of hot-rolled rings made of low alloy structural steel, quality carbon structural steel and alloy structural steel, which are used as gear rings, bearing rings, grinding rings and flanges. This standard is applicable to the manufacturing of hot-rolled rings made of low alloy structural steel, quality carbon structural steel and alloy structural steel which are used as gear rings, bearing rings, grinding rings as well as pressure vessel flat welding flanges, welding neck flanges, floating head hook ring flanges and welding neck enamel flanges. 2 Normative references GB 222 Method of sampling steel for determination of chemical composition and permissible variations for product analysis GB 223 Methods for chemical analysis of iron, steel and alloy GB 226 Etch test for macrostructure and defect of steels GB 228 Metallic materials - Tensile testing GB 229 Metallic materials - Charpy impact test (U-notch) GB 231 Metallic materials - Brinell hardness test GB 699 Quality carbon structure steel - Technical requirements GB 1591 High strength low alloy structural steels GB 3077 Alloy structural steel - Technical requirements GB 6394 Determination of estimating the average grain size of metal GB 6397 Metallic materials - Test pieces for tensile testing GB 8602 Rough-rolled tyres for railway GB 10561 Steel - Determination of content of non-metallic inclusion - Micrographic method using standard diagrams 3 Dimensions, shapes, weights and permissible deviations 3.1 Sectional dimensions and permissible deviations 3.1.1 The sectional shapes of the rings are classified into rectangular shape and irregular shape. Wherein, the shape of irregular section shall be negotiated between the supplier and the purchaser. 3.1.2 Dimensions of rings Outer diameter: 600~2,000mm; height: 70~220mm Inner diameter: ≥500mm; wall thickness: 50~160mm The specific dimensions of the rings shall be indicated in the contract. 3.1.3 The permissible dimensional deviations of rings shall meet those specified in Table 1.

1 Subject content and application scope 2 Normative references 3 Dimensions, shapes, weights and permissible deviations 4 Weight 5 Technical requirements 6 Test methods 7 Inspection rules 8 Marking and quality certificate Additional explanation