This standard specifies the technical requirements, test methods and inspection rules for silicon carbide sealing rings for mechanical seals. JB/T 6374-1992 Technical requirements for silicon carbide sealing rings for mechanical seals JB/T6374-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6374-1992
Silicon carbide sealing ring for mechanical seal
Technical conditions
Published on July 15, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Silicon carbide sealing ring for mechanical seal
Technical conditions
Subject content and scope of application
JB/T 63741992
This standard specifies the technical requirements, test methods and inspection rules for silicon carbide sealing rings for mechanical seals. This standard applies to reaction sintered, pressureless sintered and hot pressed silicon carbide sealing rings (hereinafter referred to as sealing rings) for mechanical seals. Reference standards
GB1184
GB2828
GB2997
GB3045
GB6569
Product classification
Metal Rockwell hardness test method
Shape and position tolerancebzxz.net
Provisions for tolerances not specified
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Test methods for apparent porosity, bulk density and true porosity of dense shaped refractory products Chemical analysis methods for silicon carbide
Test methods for bending strength of engineering ceramics
The classification and codes of sealing rings manufactured according to different processes are shown in Table 1. Table 1
Seal ring categories
Technical requirements
Reaction sintered silicon carbide
The chemical composition of various types of sealing rings shall comply with the provisions of Table 2. The main mechanical properties of various sealing rings shall comply with the provisions of Table 3. Pressureless sintered silicon carbide
Hot pressed silicon carbide
The sealing ring is not allowed to have defects such as cracks and impurities that affect the performance, and the sealing end face of the sealing ring is not allowed to have scratches. The flatness tolerance of the sealing end face of the sealing ring is 0.0009mm, and its surface roughness parameter R. The value is 0.2uμm. Table 2
Chemical composition
Silicon carbide content
Free silicon content
The surface roughness parameter R value of the contact part between the sealing ring and the auxiliary sealing ring is 3.2um. HPSC
The parallelism of the sealing end face of the sealing ring to the contact end face of the auxiliary sealing ring is the 7th grade tolerance specified in GB1184. %
The verticality of the sealing end face of the sealing ring to the outer circle or inner hole contacted by the auxiliary sealing ring is the 7th grade tolerance specified in GB1184. 4.7
The size tolerance zone of the outer circle or inner hole of the sealing ring in contact with the auxiliary sealing ring is h8 or H8. Approved by the Ministry of Machinery and Electronics Industry on July 15, 1992 and implemented on January 1, 1993
Bulk density
Apparent porosity
Bending strength
Test method
HRA(HS)
JB/T6374-1992
2.95~3.10
>88(100)
Chemical composition determination shall be carried out in accordance with the provisions of GB3045. Bulk density and apparent porosity determination shall be carried out in accordance with the provisions of GB2997. Bending strength determination shall be carried out in accordance with the provisions of GB6569. Hardness determination shall be carried out in accordance with the provisions of GB230.
Flatness is measured by the interferometry method of level I plane flat crystal and monochromatic light source. The surface roughness is measured by a roughness measuring instrument or checked by the sample comparison method. Surface defects are checked by the visual method.
Inspection rules
3.10~3.17
The sealing ring is inspected by the quality inspection department of the manufacturer for hardness, dimensional tolerance, form and position tolerance, appearance quality, etc., and can only be shipped after the technical requirements are met.
The product is sampled and inspected according to the normal inspection and sampling plan specified in GB2828, with a special inspection level of S-4 and an AQL of 4.0. It can only be shipped after the inspection is qualified.
6.2
When the process or raw materials are changed, the measurement should be carried out according to all the contents of the technical requirements. 7
Marking, packaging, transportation and storage
The non-working surface of the sealing ring should be marked with the manufacturer's trademark or code. The packaging of the sealing ring should ensure that it will not be damaged during transportation and storage. 7.2
7.3 Products should be packed in wooden boxes or cartons before leaving the factory. The outside of the boxes should have the words "Handle with care" and "Prevent moisture". There should be a packing list inside the box, which should indicate:
b. Manufacturer name and trademark;
c. Product name and model specifications;
d. Quantity and weight;
e. Standard number:
f. Date of shipment.
Products should be accompanied by a certificate of conformity before leaving the factory.
7.5 Products should be stored in a clean and dry warehouse. 2
People's Republic of China
Mechanical Industry Standard
Silicon Carbide Sealing Ring for Mechanical Seal
Technical Conditions
JB/T 63741992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Sheet 1/4Number of words 4.000
First printing in January 1993
First edition in January 1993
Print run 1-500
Price 2.00 Yuan
Mechanical Industry Standard Service Network: http=//www.JB.ac.cn6619
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