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JB/T 6374-2020 PDF English


Search result: JB/T 6374-2020_English: PDF (JB/T6374-2020)
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JB/T 6374-2020English110 Add to Cart 0-9 seconds. Auto-delivery. Silicon carbide rings of mechanical seal - Specification Valid
JB/T 6374-2006English279 Add to Cart 3 days Specifications for silicon carbide rings of mechanical seal Obsolete
JB/T 6374-1992English199 Add to Cart 2 days (Silicon carbide mechanical seal ring seals. Technical conditions) Obsolete
BUY with any currencies (Euro, JPY, GBP, KRW etc.): JB/T 6374-2020     Related standards: JB/T 6374-2020

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JB/T 6374-2020: PDF in English (JBT 6374-2020)

JB/T 6374-2020 MACHINERY INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.140 J 22 Replacing JB/T 6374-2006 Silicon carbide rings of mechanical seal - Specification ISSUED ON: AUGUST 31, 2020 IMPLEMENTED ON: APRIL 01, 2021 Issued by: Ministry of Industry and Information Technology of the People's Republic of China Table of Contents Foreword ... 3  1 Scope ... 5  2 Normative references ... 5  3 Product classification ... 6  4 Technical requirements ... 6  5 Test and inspection methods ... 8  6 Inspection regulations ... 8  6.1 Inspection classification ... 8  6.2 Exit-factory inspection ... 9  6.3 Identification inspection ... 9  7 Marks, packaging, transportation and storage ... 9  Bibliography... 11  Silicon carbide rings of mechanical seal - Specification 1 Scope This Standard specifies product classification, technical requirements, test and inspection methods, inspection regulations and marks, packaging, transportation and storage for silicon carbide rings of mechanical seal. This Standard is applicable to reaction sintered silicon carbide for mechanical seal, pressureless sintered silicon carbide (solid phase, liquid phase, added graphite, sealing end face with micropores), hot-pressed sintered silicon carbide seal ring (hereinafter referred to as the seal ring). 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 191, Packaging and storage marks GB/T 1184-1996, Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications GB/T 2828.1-2012, Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3045, Conventional abrasive - Chemical analysis of silicon carbide GB/T 6569, Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for flexural strength of monolithic ceramics at room temperature GB/T 8489, Test method for compressive strength of fine ceramics (advanced ceramics, advanced technical ceramics) GB/T 10700, Test methods for elastic moduli of fine ceramics (advanced ceramics, advanced technical ceramics) - Bending method GB/T 16534, Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for hardness of monolithic ceramics at room temperature GB/T 16535, Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for linear thermal expansion of monolithic ceramics by push-rod and the auxiliary seal ring contact is h7 or H7. 5 Test and inspection methods 5.1 The bulk density shall be determined in accordance with the provisions of GB/T 25995. 5.2 The porosity shall be determined according to the provisions of GB/T 25995. 5.3 The Rockwell hardness is determined according to the provisions of GB/T 230.1. 5.4 The Vickers hardness shall be determined according to the provisions of GB/T 16534. 5.5 The bending strength shall be determined according to the provisions of GB/T 6569. 5.6 The determination of chemical composition shall be carried out in accordance with the provisions of GB/T 3045. 5.7 The flatness is measured by interferometry with level I flat crystal and monochromatic light source. 5.8 The surface roughness is measured with a surface roughness measuring instrument or checked by the surface roughness sample block comparison method. 5.9 The surface defects are inspected with the naked eye and optical microscopy. 5.10 The compressive strength shall be determined according to the provisions of GB/T 8489. 5.11 The elastic modulus shall be determined according to the provisions of GB/T 10700. 5.12 The coefficient of linear expansion shall be determined according to the provisions of GB/T 16535. 5.13 The thermal conductivity shall be determined according to the provisions of GB/T 22588. 6 Inspection regulations 6.1 Inspection classification Inspection is divided into exit-factory inspection and identification inspection. 6.2 Exit-factory inspection 6.2.1 Inspection items The inspection items of the finished seal ring include appearance quality, sealing face flatness and surface roughness, dimensions and tolerances. The hardness, bulk density, and flexural strength are tested with furnace specimens from batches of products. 6.2.2 Sampling method Appearance quality is fully inspected. Use primary normal sampling plan for seal face flatness and surface roughness, dimensions and tolerances according to the provisions of GB/T 2828.1-2012. The special examination level is S-4. The AQL is 4.0. For hardness, bulk density and flexural strength, at least one sample from each batch shall be inspected. 6.3 Identification inspection 6.3.1 Inspection timing In one of the following situations, identification inspection shall be carried out: - Before design finalization and product production; - When there are major changes in product structure, materials and processes; - When the product is transferred to another factory; - When it is required by the user; - When it is required by national quality supervision department. 6.3.2 Inspection items The inspection items are all the items specified in Chapter 4. 6.3.3 Sampling method The sampling quantity is based on the inspection method involved in the inspection item. 7 Marks, packaging, transportation and storage 7.1 The non-working surface of the seal ring shall be marked with the manufacturer's trademark or code. 7.2 The packaging of the seal ring shall ensure that it will not be damaged during transportation and storage. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.