JB/T 7921-1995 Cast copper alloys for sliding bearings, single-layer and multi-layer bearings
Some standard content:
National Standard of the People's Republic of China
Plain bearings
Cast copper alloys for solid and multilayer plain bearings
Plain bearings-Copper alloys-Cast copper alloys for solid and multilayer plain bearings This standard refers to ISO4382/1-1982 "Copper alloys for plain bearings".
1. Subject content
Copper alloys
GB10448-89
Complete as: DIN B/>921-! 995
Part 1: Cast copper alloys for solid and multilayer plain bearings This standard specifies the chemical composition, mechanical and physical properties, test methods and marking of cast copper alloys used to manufacture single-layer and multilayer plain bearings.
2 Reference standards
GB228 Metal tensile test method
Sliding bearings Metal multilayer materials for thin-walled bearings GB10451
GB10452 Sliding bearings Single-layer bearings Hardness test method for anti-friction alloys GB10453 Sliding bearings Multilayer bearings Hardness test method for anti-friction alloys 3 Chemical composition and mechanical and physical properties
3.1 Chemical composition
The chemical composition of cast copper alloys is shown in Tables 1 and 2. The single value in the table represents the maximum allowable content. Other cast copper alloy materials are negotiated by the supply and demand parties. The analysis of chemical elements can be carried out in accordance with relevant standards or negotiated by the supply and demand parties. 3.2 Mechanical and physical properties
The mechanical and physical properties of cast copper alloy standard test bars are shown in Tables 1 and 2. The yield strength 6a2, elastic modulus E, thermal expansion coefficient α1, thermal conductivity λ, and density β in the table are recommended values for designers to choose. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on February 10, 1989 and implemented on January 1, 1990
GB10448-89
Table 1 Chemical composition of copper-lead-tin and copper-aluminum casting alloys for sliding bearings of single-layer and multi-layer materials, %
Chemical elements and properties
Gu+Fe+Ni+Al+Mn
GS sand casting
Brinell hardness
HB10/1000/10
Tensile strength|| tt||Elongation 81a
Metal strength a.
GM metal mold casting
GZ centrifugal casting
GC continuous casting
GS sand casting
GM metal mold casting
GZ high-center casting
GC continuous casting
GS sand casting
GM metal mold casting
GZ centrifugal casting
GC continuous casting
GS sand casting
GM metal mold casting
GZ centrifugal casting
GC continuous casting
GS sand casting
GM Mould casting
GZ high-center casting
GC continuous casting
CuPb9Sn5
Allowance\
CuPb10Sn10
Allowance\
Mechanical and physical properties of standard drop test
CuPb15Sn8
Allowance》
13.0~17.0
CuPb20Sn5
18.0~23.0
CuAl10Fe5N i5
Chemical elements and properties
Elastic modulus E, kN/mm*
Coefficient of thermal expansion a, 10-/K
Thermal conductivity R, at 15°C
W/(m·K)
Density p, .kg/dm
Note: 1) Contains Ni
GB10448—89
Continued Table 1
CuPb9Sn5
2) For continuous casting, the phosphorus content can be increased to 1.5% by negotiation. CuPb10Sn10%
Chemical composition, %
CuPb15Sn8
3) The chemical element content of this alloy is different from that of the alloy for thin-walled multilayer bearings (see GB10451). Table 2 Chemical composition of copper-tin-zinc casting alloy for single-layer sliding bearing, %
Chemical elements and properties
CuSn8Pb2
CuSn1oP
Remainder1
10.0~11.5
CuSn12Pb2
11.0~13.0
0.05~0.402)3)
CuPb20Sn5
CuPb5Sn5Zn5||tt| |Residue\
CuAl10Fe5Ni5
CuSn7Pb7Zn3
Residue 12
Chemical elements and properties
Brinell hardness
10/1:000/10
Tensile strength Oni
Elongation 3h
Yield limit g2
GS sand casting
GM metal mold
GZ centrifugal casting
GC continuous casting| |tt||GS sand castingWww.bzxZ.net
GM metal mold casting
GZ centrifugal casting
GC continuous casting
GS sand casting
GM metal mold casting
GZ centrifugal casting
GC continuous casting
GS sand mold casting
GM metal mold casting
GZ centrifugal casting
GC continuous casting
Elastic modulus E,
kN/mm2||tt ||Coefficient of thermal expansion,
10\/K'
Thermal conductivity in
At 15℃
W/(m·K)s
Density p,
GB10448—89
Continued Table 2
CuSn1oP
CuSn8Pb2
Chemical composition, %
CuSn12Pb2
Mechanical and physical properties of standard test bars
Note: 1) Contains Ni.
2) For continuous casting, the phosphorus content may be increased to 1.5% by negotiation. 3) The phosphorus content may be determined by negotiation.
Mechanical property test methods
The tensile test of cast copper alloy shall be carried out in accordance with the provisions of GB228. 80
CuPb5Sn5Zn5
CuSn7Pb7Zn3
GB1044889
The hardness test of cast copper alloy shall be carried out in accordance with the provisions of GB10452 and GB10453. 5 Codes and markings
5.1 Codes
GS-sand casting;
GM-metal casting;
GZ——high-center casting;
GC-—continuous casting;
G-—tensile strength test;
8 tensile strength and elongation test;
HB—Brinell hardness test.
5.2 Marking example
Marking example for bearing alloy CuPb10Sn10, process continuous casting (GC), and requirement of tensile strength and elongation test (co): Bearing alloy GB10448-GC-CuPb10Sn10-g8 General use
For the general uses of cast copper alloys, see Appendix A (reference part), 378
For the general uses of cast copper alloys, see Table A1. Alloy grade
CuPb9Sn5
CuPbioSn10
CuPb15Sn8
GB10448—89
Appendix A
General uses of cast copper alloys
(reference part)
Bearing bimetal
General manufacturing method
Casting or sintering on steel back
(strip), or metal mold casting
Casting or sintering on steel back
(strip), or metal mold casting
Has high fatigue strength and load-bearing capacity, high hardness and wear resistance, good
corrosion resistance. Increasing the tin content can improve the hardness and wear resistance of the alloy, and increasing the lead content can improve the alloy's ability to withstand poor assembly and intermittent lubrication. Suitable for bearings with medium speed, medium to high speed and large impact cases caused by swinging or rotating motion. The hardness of the pure shaft matching collar is not less than HB250. It has high fatigue strength and load-bearing capacity, high hardness and wear resistance, and corrosion resistance. Increasing the tin content can improve the hardness and wear resistance of the alloy, and increasing the lead content can improve the alloy's ability to withstand poor assembly and intermittent lubrication. It can be lubricated with water. The hardness of the matching journal is generally not less than HB200. General purpose. Generally used for steam turbines, engines, machine tool bearings, internal combustion engine piston pins, automobile steering gears and differential shafts, sleeves, thrust washers, etc. Suitable for medium and high speed single-layer and double-layer metal bearings, sleeves and single-layer metal thrust washers, cold rolling mills, bearings. Alloy grades: CuPb20Sn5, CuAl10Fe, CuSn8Pb2, CuSn7Pb7, CuSn1 oP
Bearing bimetal
General manufacturing method
GB10448-89
Continued Table A1
Casting or sintering on steel back
(strip)
Metal mold casting
Casting or sintering on steel back
(strip) or metal mold porcelain casting
Casting on steel back or metal
mold casting
Has higher load-bearing capacity and fatigue
strength, higher lead content can improve
the surface properties of the alloy at high speed, but the
corrosion resistance is slightly reduced; increasing the
pot content can improve the alloy hardness and
wear resistance, and can be lubricated with water. Suitable for medium load, medium to high speed, and due to swing or impact load. The new cat bearing matching box collar is generally not less than HB150. It is a very hard bearing alloy, resistant to seawater corrosion and poor embedding. It has high hardness, wear resistance and good corrosion resistance. The hardness of the matching journal is not less than HB280. It has high hardness and corrosion resistance, good wear resistance. General purpose. Generally used for The gearbox of automobiles, agricultural machinery and rocker shafts of internal combustion engines are suitable for manufacturing structural elements for sliding motion, bearings working in marine environments, high-load sleeves, but the journals must be hardened and the hardness should not be lower than that of the sleeves used for bearings with low to high loads and non-critical uses. They need to be fully suitable for bearings working under medium to heavy loads, high speeds and impact load conditions. The journals should be hardened and the hardness is generally not less than HB300. Requires good
lubrication and assembly
Alloy grade
CuSn12Pb2
CuPb5Sn5Zn5
Additional instructions:
Auxiliary bimetal
General manufacturing method
GB1044889
Continued Table A1
Casting or sintering on steel back
Or metal mold casting
Casting or sintering on steel back
Or metal mold casting
This standard is proposed by the Ministry of Machinery and Electronics Industry. It has high hardness and corrosion resistance, good wear resistance, high hardness, wear resistance and corrosion resistance, high impact resistance and high temperature resistance, poor abrasion resistance, and the hardness of the matching journal is generally not less than HB250. This standard is under the jurisdiction of the Mechanical Standardization Institute of the Ministry of Machinery and Electronics Industry. General use: It is suitable for bearings working under medium to heavy loads, high speeds, and impact load conditions. The journal should be hard, and the hardness is generally not less than HB300. It requires good lubrication and assembly. It is a general-purpose bearing material, suitable for bearings and thrust washers working under low-load and non-critical working conditions, such as automobile engine piston pins, gearbox sleeves, etc. This standard was drafted by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry and the Changchun Automobile Research Institute. The main drafters of this standard are Wan Ma and Zhang Baoyi.
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