Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
Cast bearing metals
1 Subject content and applicable scope
This standard specifies the technical requirements and inspection rules for cast tin-based, lead-based, copper-based and aluminum-based bearing metals.
This standard is applicable to the manufacture of metallic multilayer plain bearings with tin and aluminum-based integral plain bearings.
2 Normative references
GB 228 Metallic tensile testing
GB 231 Metallic materials - Brinell hardness test
GB 1173 Specification for cast aluminium metals
GB/T 1176 Specification for cast copper metals
GB 1198 Methods for chemical analysis of aluminum
GB 3260.1~3260.9 Methods for chemical analysis of tin
GB 4103.1~4103.12 Methods for chemical analysis of lead-base metals
GB 8002 Methods for chemical analysis of tin bronze
YB 55 Methods for chemical analysis of aluminum bronze
3 Designation representation of metals
The designation of cast bearing metals is composed of the chemical symbols of base metal elements and main metal elements. The main metal element is followed by a number indicating its nominal percent content, which is the round-off integer of this element's average percent content. If the nominal percentage content of metal elements is not less than 1, the number is expressed as an integer. If the nominal percentage content of metal elements is less than 1, the number is generally not marked. If necessary, it can be expressed as one decimal.
The letters "Z" is respectively (the first letter of Chinese phonetic alphabets "Zhu” indicates the cast metal] added before the metal designation.
In case of more than two metal elements, it is not necessary to list all metal elements in the designation except for the essential characteristics of the metals.
The main metal elements in the designation are arranged in descending order of nominal percentage content. When their nominal percent content is equal, they are arranged alphabetically according to their chemical symbols, but for copper-based metals, the elements characterizing the metal series shall be followed closely by the base elements.
4 Technical requirements
4.1 See Table 1 for chemical composition of cast bearing metals
4.2 See Table 2 for the mechanical properties of cast bearing metals.
4.2.1 Separately cast specimens for cast tin-based and lead-based bearing metal hardness shall be as shown in the Figure.
Requirements for hardness determination: HB10/250/60
Diagram of cast tin-based and lead-based bearing metal hardness
4.2.2 The allowable bond defects (stripper) in the bond transition layer between cast tin-based and lead-based bearing metals and backings (bad bond or no bond between tin-based and lead-based bearing metals and backings) can be inspected in accordance with Sub-clause A7 of Annex A (Reference).
4.2.3 Separately cast specimens with the mechanical properties of cast copper-based bearing metal shall be in accordance with GB 1176.
4.2.4 Separately cast specimens with mechanical properties of cast aluminium-based bearing metal shall be in accordance with GB 1173.
4.2.5 The cast-on specimens can also be used for testing the mechanical properties of cast bearing metals.
4.3 In addition to the above, other special requirements such as mechanical properties and physical properties shall be put forward for the bearing metals by the buyer in the drawings or related technical documents or agreed between the supplier and the buyer.
5 Test methods and inspection rules
5.1 Chemical composition
5.1.1 The chemical composition of metals shall be tested in accordance with GB 3260.1~3260.9, GB 4103.1~4103.12, GB 8002 and YB 55. Other methods may be adopted under guaranteed analysis. In case of any dispute, chemical method is adopted for arbitration.
5.1.2 The chemical composition shall be inspected as per smelting furnace or according to the requirements of the buyer. The specimens of the chemical composition can be taken from castings (including cast-on specimens).
5.1.3 For chemical composition inspection, one specimen shall be delivered for the first time. If the analysis result meets the requirements of Table 1, the chemical composition is qualified. Otherwise, another specimen is allowed to be delivered. If the analysis results meet the requirements in Table 1, the chemical composition of the metal in smelting furnace is qualified; otherwise, unqualified.
5.1.4 Only the main elements are analyzed for chemical composition inspection, and the content of other elements can be checked as required by the buyer.
1 Subject content and applicable scope 2 Normative references 3 Designation representation of metals 4 Technical requirements 5 Test methods and inspection rules Annex A Metallic multilayer plain bearings - Bond test - Non-destructive ultrasonic testing of bond defects of bearing metal layer thickness greater than or equal to 2 mm (Reference) Annex B Multilayer plain bearings - Bond test - Determination of bond strength for bearing metal layer thickness greater than or equal to 2 mm (Reference) Additional explanation
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
Cast bearing metals
1 Subject content and applicable scope
This standard specifies the technical requirements and inspection rules for cast tin-based, lead-based, copper-based and aluminum-based bearing metals.
This standard is applicable to the manufacture of metallic multilayer plain bearings with tin and aluminum-based integral plain bearings.
2 Normative references
GB 228 Metallic tensile testing
GB 231 Metallic materials - Brinell hardness test
GB 1173 Specification for cast aluminium metals
GB/T 1176 Specification for cast copper metals
GB 1198 Methods for chemical analysis of aluminum
GB 3260.1~3260.9 Methods for chemical analysis of tin
GB 4103.1~4103.12 Methods for chemical analysis of lead-base metals
GB 8002 Methods for chemical analysis of tin bronze
YB 55 Methods for chemical analysis of aluminum bronze
3 Designation representation of metals
The designation of cast bearing metals is composed of the chemical symbols of base metal elements and main metal elements. The main metal element is followed by a number indicating its nominal percent content, which is the round-off integer of this element's average percent content. If the nominal percentage content of metal elements is not less than 1, the number is expressed as an integer. If the nominal percentage content of metal elements is less than 1, the number is generally not marked. If necessary, it can be expressed as one decimal.
The letters "Z" is respectively (the first letter of Chinese phonetic alphabets "Zhu” indicates the cast metal] added before the metal designation.
In case of more than two metal elements, it is not necessary to list all metal elements in the designation except for the essential characteristics of the metals.
The main metal elements in the designation are arranged in descending order of nominal percentage content. When their nominal percent content is equal, they are arranged alphabetically according to their chemical symbols, but for copper-based metals, the elements characterizing the metal series shall be followed closely by the base elements.
4 Technical requirements
4.1 See Table 1 for chemical composition of cast bearing metals
4.2 See Table 2 for the mechanical properties of cast bearing metals.
4.2.1 Separately cast specimens for cast tin-based and lead-based bearing metal hardness shall be as shown in the Figure.
Requirements for hardness determination: HB10/250/60
Diagram of cast tin-based and lead-based bearing metal hardness
4.2.2 The allowable bond defects (stripper) in the bond transition layer between cast tin-based and lead-based bearing metals and backings (bad bond or no bond between tin-based and lead-based bearing metals and backings) can be inspected in accordance with Sub-clause A7 of Annex A (Reference).
4.2.3 Separately cast specimens with the mechanical properties of cast copper-based bearing metal shall be in accordance with GB 1176.
4.2.4 Separately cast specimens with mechanical properties of cast aluminium-based bearing metal shall be in accordance with GB 1173.
4.2.5 The cast-on specimens can also be used for testing the mechanical properties of cast bearing metals.
4.3 In addition to the above, other special requirements such as mechanical properties and physical properties shall be put forward for the bearing metals by the buyer in the drawings or related technical documents or agreed between the supplier and the buyer.
5 Test methods and inspection rules
5.1 Chemical composition
5.1.1 The chemical composition of metals shall be tested in accordance with GB 3260.1~3260.9, GB 4103.1~4103.12, GB 8002 and YB 55. Other methods may be adopted under guaranteed analysis. In case of any dispute, chemical method is adopted for arbitration.
5.1.2 The chemical composition shall be inspected as per smelting furnace or according to the requirements of the buyer. The specimens of the chemical composition can be taken from castings (including cast-on specimens).
5.1.3 For chemical composition inspection, one specimen shall be delivered for the first time. If the analysis result meets the requirements of Table 1, the chemical composition is qualified. Otherwise, another specimen is allowed to be delivered. If the analysis results meet the requirements in Table 1, the chemical composition of the metal in smelting furnace is qualified; otherwise, unqualified.
5.1.4 Only the main elements are analyzed for chemical composition inspection, and the content of other elements can be checked as required by the buyer.
Contents of GB/T 1174-1992
1 Subject content and applicable scope
2 Normative references
3 Designation representation of metals
4 Technical requirements
5 Test methods and inspection rules
Annex A Metallic multilayer plain bearings - Bond test - Non-destructive ultrasonic testing of bond defects of bearing metal layer thickness greater than or equal to 2 mm (Reference)
Annex B Multilayer plain bearings - Bond test - Determination of bond strength for bearing metal layer thickness greater than or equal to 2 mm (Reference)
Additional explanation
