This standard specifies the technical requirements, test methods, inspection rules, packaging, transportation, storage, etc. of boron carbide sealing rings for mechanical seals. This standard is applicable to hot-pressed boron carbide sealing rings. The working conditions are water, oil, organic solvents, strong acids and alkalis, and media with solid particles at a pressure of no more than 6.3MPa and a temperature of -20~200℃. JB/T 6615-1993 Technical conditions for boron carbide sealing rings for mechanical seals JB/T6615-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6615-1993
Boron carbide sealing ring for mechanical seal
Technical conditions
Published on 1993-05-07
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Boron carbide sealing ring for mechanical seal
Technical conditions
Subject content and scope of application
JB/T 66151993
This standard specifies the technical requirements, test methods, inspection rules, packaging, transportation, storage, etc. of boron carbide sealing rings for mechanical seals.
This standard applies to hot-pressed boron carbide sealing rings (hereinafter referred to as boron carbide sealing rings). Working conditions are water, oil, organic solvent, strong acid and alkali and medium with solid particles at a pressure not exceeding 6.3MPa and a temperature between -20 and +200℃. 2
Reference standards
GB1184
GB2828
GB2997
GB9255
Technical requirements
Metal Rockwell hardness test method
Shape and position tolerance Provisions for tolerances not noted Batch inspection Count sampling procedures and sampling tables (applicable to continuous batch inspection) Test methods for apparent porosity, water absorption, bulk density and true porosity of dense shaped refractory products Boron carbide chemical analysis method
Boron carbide sealing rings shall comply with the provisions of this standard and be manufactured according to drawings and technical documents approved by the prescribed procedures. The chemical composition of boron carbide sealing rings shall comply with the provisions of Table 1. Table 1
Boron carbide content
Free carbon content
Free carbon content
The main physical and mechanical properties of boron carbide sealing rings shall comply with the requirements of Table 2 Table 2
Bulk density
Apparent porosity
Compressive strength
Elastic modulus
Expansion coefficient
Thermal shock stability
Approved by the Ministry of Machinery Industry on 1993-05-07
Performance index
≥180
2.96×105
Implementation on 1994-01-01
JB/T 6615-1993
Boron carbide sealing rings are not allowed to have defects such as cracks and inclusions that affect their performance. 3.4
The flatness of the end face of the boron carbide sealing ring is 0.0009mm, and the surface roughness R. value is 0.2um. 3.5
The surface roughness R of the contact part between the boron carbide sealing ring and the auxiliary sealing ring is 3.2μm. 3.7
The parallelism of the sealing end face of the boron carbide sealing ring to the end face in contact with the auxiliary sealing ring is the 7th grade tolerance specified in GB1184. The verticality of the outer circle or inner hole of the boron carbide sealing ring contacting the auxiliary sealing ring is in accordance with the 7th grade tolerance specified in GB1184. 3.8
The outer circle or inner hole size tolerance zone of the boron carbide sealing ring contacting the auxiliary sealing ring is h8 or H8. Test method
The chemical composition of the boron carbide sealing ring is determined according to the method specified in GB9255. 4.2 The volume density and porosity of the boron carbide sealing ring are determined according to the method specified in GB2997. The surface hardness of the boron carbide sealing ring shall be determined according to the method specified in GB230. 4.37
The compressive strength of the boron carbide sealing ring shall be determined according to the relevant standards. 4.47
5The thermal shock stability determination method is to heat the rough boron carbide sealing ring to 800℃, and then put it into the running cold water at room temperature, and repeat it for 4.5
5 times continuously without cracks. Three samples are taken for each inspection. 4.6The flatness of the boron carbide sealing ring is measured by a Class I precision flat crystal and a monochromatic light source spectrum. The surface roughness of the boron carbide sealing ring is measured by a roughness measuring instrument, and can also be checked by the sample comparison method. 4.7
4.8The surface quality of the boron carbide sealing ring is checked by the intuitive method. 5Inspection rules
Boron carbide sealing rings can only be shipped after being inspected and qualified by the quality inspection department of the manufacturer. 5.2
Factory inspection items are: hardness, dimensional tolerance, geometric tolerance, and appearance quality. When any of the following circumstances occurs, the items in Articles 3.2 and 3.3 shall be inspected. 5.3
Products are transferred to another factory for production;
The production process, raw material composition, etc. have changed; b.
Continuous production for 5 years:
The suspension time exceeds 18 months;
The factory inspection result is significantly different from the last type inspection result: The superior quality supervision agency requires inspection. 5.4 Boron carbide sealing ring products are sampled and inspected according to the one-time sampling plan specified in GB2828, with a special inspection level of S-4 and an AQL of 4.0. Marking, packaging, transportation and storage
The non-working surface of the boron carbide sealing ring shall be marked with the manufacturer's trademark or code, model, etc. 6.2
The packaging of the boron carbide sealing ring shall ensure that it will not be damaged during transportation and storage. The packaging box (box) of boron carbide sealing ring should have the words "handle with care" in a conspicuous place. There should be a packing list inside the box, which should indicate: 6.3
Manufacturer name or trademark:
b. Product name and model specification:
Batch number:
Quantity and weight:
e. Standard number:
f. Date of manufacture.
6.4 Products should be accompanied by a certificate of conformity before leaving the factory.
6.5 Products should be stored in a clean and dry warehouse. Additional instructions;
JB/T6615-1993
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Mudanjiang Abrasives and Grinding Tools Industry Company and the 704th Institute of the 7th Institute of China Shipbuilding Industry Corporation. The main drafters of this standard are Zeng Jiuzheng and Li Xuehu. 3
People's Republic of China
Mechanical Industry Standard
Boron Carbide Sealing Ring for Mechanical Seal
Technical Conditions
JB/T 66151993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Format 880×12301/16
First edition in October 1993
Postal Code 100044)www.bzxz.net
Sheet 1/2Number of words 4.000
First edition in October 1993
Sold once
Number of prints 1-500
Price 2.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_199
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