GB/T 35088-2018 English PDF (GBT35088-2018)

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GB/T 35088-2018: Plain bearings -- Tin casting alloys for multilayer plain bearings
GB/T 35088-2018
Plain bearings--Tin casting alloys for above plain bearings
ICS 21.100.10
J12
National Standards of People's Republic of China
Sliding bearing
Tin-based casting alloy for multi-layer sliding bearings
(ISO 4381.2011, IDT)
Published on.2018-05-14
2018-12-01 implementation
State Market Supervisory Administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard uses the translation method equivalent to ISO 4381.2011 "Silicon cast alloy for sliding bearing multi-layer sliding bearings".
This standard has made the following editorial changes.
--- Added the scope of Chapter 1 "Note. In addition to the materials specified in this standard, the chemical composition and technical requirements of other grades of tin-based casting alloys
See Appendix A. ”
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Sliding Bearing Standardization Technical Committee (SAC/TC236).
This standard is drafted by. China National Machinery Productivity Promotion Center, Hefei Bolin New Materials Co., Ltd., Changzhou Hengye Bearing Materials
Limited company.
Participated in the drafting of this standard. Hunan Chongde Industrial Technology Co., Ltd., Linan Oriental Sliding Bearing Co., Ltd., Shanghai Nuclear Power Industry Co., Ltd.
Limited company, Jinhua Chengkai Alloy Materials Co., Ltd., Hunan UFO New Materials Co., Ltd.
This standard is interpreted by the National Standardization Technical Committee for Plain Bearings.
Sliding bearing
Tin-based casting alloy for multi-layer sliding bearings
1 Scope
This standard specifies the technical requirements for tin-based cast bearing alloys for multi-layer plain bearings. Chemical composition and material properties refer to raw materials
Raw materials should be tested using representative samples. Due to the influence of bearing manufacturing, the test results of finished bearings may be related to the detection of raw materials.
Inconsistent. Therefore, the test results of finished bearings should not be used as the basis for determining the material performance indicators.
Note. In addition to the materials specified in this standard, the chemical composition and technical requirements of other grades of tin-based casting alloys are given in Appendix A.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
ISO 1143 Metallic material slewing beam bending fatigue test (Metalicmaterials-Rotatingbarbendingfatigue
Testing)
ISO 4384-2 Plain bearings bearing alloys - Determination of hardness - Part 2. Single layer materials (Plainbearings-Hardnesstes-
Tingofbearingmetals-Part 2. Solidmaterials)
Plain bearings - Multilayer plain bearings with sliding bearings - Part 2. Bearing alloys with a thickness greater than or equal to 2 mm
Non-destructive testing of layer bond strength (Plainbearings-Metalicmultilayerplainbearings-Part 2. Destructive
Testingofbondforbearingmetallayerthicknessesgreaterthanorequalto2mm)
3 requirements
3.1 Chemical composition
The chemical composition of the alloying elements shall be within the range specified in Table 1. When there is a dispute, chemical analysis is an arbitration method.
3.2 Mechanical properties
Material properties shall comply with the requirements of Table 1.
All performance values for a material are averages or ranges as typical values at design time. Due to the large range of certain alloys and cold
However, the condition has a significant effect on the mechanical properties. In some cases, some performance values will deviate significantly from the given values.
3.3 Selection of materials
Guidelines for bearing alloy applications and bearing pair (shaft) hardness are given in Appendix A.
Table 1 Tin-based casting alloy
chemical element
Chemical composition (mass fraction) /%
SnSb8Cu4
Sn rest
Sb 7~8
Cu 3~4
Impurity
Pb < 0.35
As < 0.1
Bi < 0.08
Fe < 0.1
Al < 0.01
Zn < 0.01
Cd < 0.05
Other total amount 0.2
Mechanical behavior
Brinell hardness
According to ISO 4384-2, HBW10/250/180
20°C 22
100 ° C 10
0.2% tensile yield stress Rp0.2
N/mm2
20°C 46
Tensile strength Rm
N/mm2
20°C 77
0.2% compression yield stress σd0.2
N/mm2
20°C 47
100°C 27
Bond strength RCh
N/mm2
See 8.1 and 8.2 in ISO 4386-2.2012
Rotary beam bending fatigue Rrbf
According to ISO 1143, 107 cycles
N/mm2
±29
Linear thermal expansion coefficient α
10-6/K
23.9
Melting temperature
233~360
Casting temperature
440~460
Density ρ
Kg/dm3
7.3
4 mark
Example. The bearing alloy with the chemical composition code SnSb8Cu4 is marked as follows.
Bearing alloy GB/T 35088-SnSb8Cu4
Appendix A
(informative appendix)
Guide to bearing alloy applications and bearing pair (shaft) hardness
Bearing alloy characteristics and the minimum hardness of the main purpose shaft a
SnSb8Cu4
Good slidability, compliance and high toughness; good embedding; suitable for hydrodynamic pressure
High sliding speed, medium load in the range; low frequency impact stress; no alternating bending stress
sensitive.
Suitable for high load rolling mill bearings; for the manufacture of rolled bushings up to 3 mm left
Right thin wall bearing bush and thrust washer
160HBW
a In multi-layer plain bearings, the difference between the bearing material and the shaft material hardness should be safe to avoid seizure under working conditions. Working conditions,
In particular, the lubrication conditions have a considerable influence on the selection of the shaft material. Therefore, the recommended shaft material hardness value is the minimum value. Usually, tin-based bearings
The material is used to match un-quenched and untempered shafts.
references
[1] ISO 4386-1 Plainbearings-Metalicmultilayerplainbearings-Part 1. Non-destructrive
Ultrasonictestingofbond
[2] ISO 4386-3 Plainbearings-Metalicmultilayerplainbearings-Part 3. Non-destructive
Penetranttesting
OSI/
8102-
T/