This standard specifies the grades and representation methods of sintered high-speed steel products, the technical requirements, test methods and inspection rules of products. This standard applies to powder metallurgy high-speed steel products produced by cold pressing and vacuum sintering using atomized powder as raw materials. JB/T 5965-1991 Technical conditions for sintered high-speed steel products JB/T5965-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5965-91
Technical Conditions for Sintered High-Speed ​​Steel Products
Published on December 11, 1991
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Implemented on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Sintered High-Speed ​​Steel ProductsbZxz.net
1 Subject Content and Scope of Application
JB/T5965---91
This standard specifies the grades and representation methods of sintered high-speed steel products, the technical requirements, test methods and inspection rules for products. This standard applies to powder metallurgy high-speed steel products produced by cold pressing and vacuum sintering using water atomized powder as raw materials. 2 Reference standards
GBn224
GB4309
GB3850
GB2828
GB5957
F3701X(FT15)Technical conditions for powder metallurgy high-speed tool steelClassification and grade designation of powder metallurgy materialsStandard methods for chemical analysis of steel
Metal Rockwell hardness test method
Metal Brinell hardness test method
Density determination method for dense sintered metal materials and cemented carbideBatch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)Sampling of sintered metal materials (excluding cemented carbide)Technical conditions for high-speed tool steel Conditions
Methods for chemical analysis of steel
3 Grades and their representation methods
M is medium density (relative density 78~84%)
State or characteristics of materials+H is high density (relative density>84~98%)LF is full density (relative density>98%)
Sequence number
Tool steel
r(01~09) is ordinary type
L(11~19) is superhard type
Tool materials
Powder metallurgy
4 Technical requirements
4.1 The grade, chemical composition, density and annealed hardness of the product shall comply with the provisions of Table 1. 4.2 There shall be no cracks, inclusions, interlayers and other defects visible to the naked eye on the surface of the product. 4.3 The microstructure of sintered high-speed steel products delivered in heat-treated state is tempered martensite + carbide + a small amount of residual austenite, in which the carbides should be fine and uniform, and the maximum carbide size should be less than 25μm (Figure a, b). Local semi-net carbides are allowed (Figure c, d), but continuous net carbides or ledeburite structure are not allowed (Figure e). 4.4 The hardness of sintered high-speed steel products after quenching and tempering shall comply with the requirements of Table 2. Approved by the Ministry of Machinery and Electronics Industry on December 11, 1991 and implemented on July 1, 1992
JB/T596591
Figure Microstructure of Sintered High Speed ​​Steel Products 400× Brand
F3702M
F3702H
F3702F
F3703M
F3703H
F3703F
F3711F
Note: The contents of Mn, P and S are not limited indicators. Brand
F3702M
F3702H
F3702F
F3703M
F3703H
F3703F
F3711F
Test method
Fire temperature℃
1150~1200
1180~1230
1150~1200||t t||1180~1230
1210~1250
JB/T5965-91
Coolant
Oil or nitrogen
Oil or salt bath
Oil or nitrogen
Oil or salt bath
Oil or salt bath
Tempering temperature℃
540~560
Each batch of sintered high-speed steel products shall be tested as specified in Table 3. Table 3
Test items
Chemical analysis
Microstructure
Test method
GB223, YB35(1), YB35(2)
GB230, GB231
GB3850
Caliper or other measuring tools
Visual observation
Tempering time and number
2h2 times
1h3 times
2h2 times
1h3 times
1h3~4 times
Sample requirements
Each batch
Each furnace
Each furnace
Each batch
Fire state
≤251
≤283
HardnessHRC
Sampling quantity
6 Inspection rules
6.1Each batch of products is made of powder with the same batch number. JB/T5965—91
6.2The products shall be inspected and accepted by the inspection department and issued with a certificate before they can leave the factory6.3The factory test items and sampling methods shall be carried out in accordance with the provisions of Table 3. 6.4 Each inspection result shall comply with the provisions of the corresponding technical requirements. Unqualified items shall be sampled and re-inspected according to the provisions of GB5957. If qualified after re-inspection, it can be judged as qualified. If unqualified after re-inspection, it shall be judged as unqualified, and the batch of products shall be treated as scrap. 6.5 The purchaser may sample the received products according to GB2828 and accept them according to the test methods specified in this standard. If the inspection results do not meet the requirements of this standard, it shall be reported to the supplier within three months from the date of receipt of the product, and the two parties shall negotiate to resolve the problem. Marking, packaging, transportation and storage
7.1＇Each product shall be coated with anti-rust oil, wrapped with moisture-proof paper, and placed in a wooden box. The net weight of each box shall not exceed 30kg. 7.2 The packing list shall indicate the following:
Manufacturer name;
Product name and brand:
Factory number, factory date;
Product inspection certificate or warranty,
7.3 The outside of the packaging box shall indicate: product brand, product name, batch number and net weight, and have words or signs such as "moisture-proof". 7.4 The product shall be protected from moisture during transportation and shall not be subjected to severe magnetic shock. 7.5 The product shall be stored in a dry coal, ventilated and acid-free, alkali-free atmosphere to prevent oxidation. Additional remarks:
This standard is proposed and managed by Beijing Powder Metallurgy Research Institute. This standard is provided by Shanghai Materials Research Institute. Responsible for drafting, the main drafter of this standard is Dai Xingyi.
People's Republic of China
Mechanical Industry Standard
Technical Conditions for Sintered High-Speed ​​Steel Products
IB/T5965-91
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (Box 8144, Beijing
Zip Code 100081)
Copyright Exclusive Reproduction
Printed in Qinghe County, Hebei Province
Format 880×12301/16 Printing Sheet 1/2 Number of Words 8000 First Edition in February 1992
First Printing in February 1992
Number 0491
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