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JB/T 6374-2020 PDF in English


JB/T 6374-2020 (JB/T6374-2020, JBT 6374-2020, JBT6374-2020)
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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.