1 Scope of Application The provisional technical conditions of this provision stipulate the dimensions, shape, weight, technical requirements, inspection and test, packaging, marking and quality certificates of 40CrB structural hot-rolled seamless steel tubes. Gate Valves,Sea Water Gate Valve,Stainless Steel Gate Valve,Steel Gate Valve ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztpipevalve.com
This provisional technical condition applies to 40CrB hot-rolled seamless steel tubes used for the manufacture of track pin bushings or other structures produced by Baoshan Iron and Steel Co., Ltd.
2 Normative references The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to reach an agreement based on this standard to study whether the latest version of these documents can be used . For undated references, the latest version is applicable to this standard.
GB/T 222 steel chemical analysis sample sampling method and finished product chemical composition allowable deviation
Decarburization depth of GB/T 224 steel
Hardenability end quenching test method for GB/T 225 steel
GB/T 5777 seamless steel pipe ultrasonic flaw detection method
GB/T 7735 eddy current inspection method for steel pipe
Q/BQB 203 Seamless Steel Pipes for Pipes, Containers and Equipment Structures
ASTM E45 Test Method for Determination of Inclusions in Steel
ASTM E112 Determination of Average Grain Size
3 Size, shape and weight
3.1 The outer diameter and wall thickness of the steel pipe are to comply with the requirements in Tables 1 and 2 of Q/BQB 203. The allowable deviations are to be implemented in accordance with Table 3 and Table 4 of Q/BQB 203.
3.2 The length, shape and weight of the steel pipe are to comply with the requirements of Q/BQB 203.
4 Technical requirements
4.1 Grades and Chemical Composition
4.1.1 The steel grade and chemical composition (smelting analysis) shall comply with the requirements of Table 1.
4.1.2 The allowable deviation of the chemical composition of the finished steel pipe shall comply with the relevant provisions of GB/T 222.
Table 1 
4.2 Smelting method The steel used for the steel pipe is smelted by an electric furnace and refined outside the furnace.
4.3 Delivery status The finished steel pipe is delivered in hot rolled condition.
4.4 Hardenability The circular billet is forged and processed at 870°C to 880°C for normalizing, and processed into standard specimens according to the requirements of GB/T 225. The top quenching is performed at 845±5°C. The hardenability of the round billets is to satisfy:
Special requirements can be negotiated between the supplier and the buyer.
4.5 Each sample of decarburized layer shall be taken on each of two steel pipes, and the inner and outer surface decarburized layer shall be inspected according to GB/T 224. The depth of the total decarburized layer on the inner and outer surfaces is not more than 0.5mm and 1.2mm, respectively.
4.6 Austenite grain size The supplier shall check the austenite grain size according to ASTM E112 using a 930°C 3 hour quenching method and shall ensure that the austenite grain size is less than 5 grades.
4.7 Non-metallic inclusions of non-metallic inclusions shall be tested in accordance with ASTM E45, Method A. Non-metallic inclusions Class A ≤ 3.0, Class B ≤ 2.5, Class C ≤ 2.0, Class D ≤ 2.0. Special requirements can be negotiated between the supplier and the buyer.
4.8 Dense steel pipes shall be tested by eddy current testing in accordance with level B in GB/T 7735, in order to test the compactness of the steel pipes.
4.9 Non-destructive testing of steel pipes shall be carried out by ultrasonic testing at the C8 level in GB/T 5777.
4.10 Surface quality The inner and outer surfaces of steel tubes shall be free of cracks, folds, pleats, delamination, and scabs. These defects shall be completely removed, but the actual wall thickness of the clearing area shall not be less than the minimum allowed by the wall thickness. Special requirements can be negotiated with the user.
Permissible slight bulges, depressions or shallow roll marks due to the manufacturing method, but the outer diameter and wall thickness of the steel tube must be within the allowable dimensional deviation and does not affect the serviceability of the steel tube.
5 Inspection and testing, packaging, marking and quality certification Inspection and testing of steel pipes, packaging, markings and quality certificates shall comply with Q/BQB 203 regulations. 1 Scope of Application The provisional technical conditions of this provision stipulate the dimensions, shape, weight, technical requirements, inspection and test, packaging, marking and quality certificates of 40CrB structural hot-rolled seamless steel tubes.
This provisional technical condition applies to 40CrB hot-rolled seamless steel tubes used for the manufacture of track pin bushings or other structures produced by Baoshan Iron and Steel Co., Ltd.
2 Normative references The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to reach an agreement based on this standard to study whether the latest version of these documents can be used . For undated references, the latest version is applicable to this standard.
GB/T 222 steel chemical analysis sample sampling method and finished product chemical composition allowable deviation
Decarburization depth of GB/T 224 steel
Hardenability end quenching test method for GB/T 225 steel
GB/T 5777 seamless steel pipe ultrasonic flaw detection method
GB/T 7735 eddy current inspection method for steel pipe
Q/BQB 203 Seamless Steel Pipes for Pipes, Containers and Equipment Structures
ASTM E45 Test Method for Determination of Inclusions in Steel
ASTM E112 Determination of Average Grain Size
3 Size, shape and weight
3.1 The outer diameter and wall thickness of the steel pipe are to comply with the requirements in Tables 1 and 2 of Q/BQB 203. The allowable deviations are to be implemented in accordance with Table 3 and Table 4 of Q/BQB 203.
3.2 The length, shape and weight of the steel pipe are to comply with Q/BQB 203.
4 Technical requirements
4.1 Grades and Chemical Composition
4.1.1 The steel grade and chemical composition (smelting analysis) shall comply with the requirements of Table 1.
4.1.2 The allowable deviation of the chemical composition of the finished steel pipe shall comply with the relevant provisions of GB/T 222.
Table 1
Brand chemical composition % C Si Mn P S Cr B 40CrB 0.38 to 0.43 0.15 to 0.35 0.60 to 0.85 ≤ 0.025 0.010 to 0.030 0.90 to 1.20 0.0005 to 0.003
4.2 Smelting method The steel used for the steel pipe is smelted by an electric furnace and refined outside the furnace.
4.3 Delivery status The finished steel pipe is delivered in hot rolled condition.
4.4 Hardenability The circular billet is forged and processed at 870°C to 880°C for normalizing, and processed into standard specimens according to the requirements of GB/T 225. The top quenching is performed at 845±5°C. The hardenability of the round billets is to satisfy:
Special requirements can be negotiated between the supplier and the buyer.
4.5 Each sample of decarburized layer shall be taken on each of two steel pipes, and the inner and outer surface decarburized layer shall be inspected according to GB/T 224. The depth of the total decarburized layer on the inner and outer surfaces is not more than 0.5mm and 1.2mm, respectively.
4.6 Austenite grain size The supplier shall check the austenite grain size according to ASTM E112 using a 930°C 3 hour quenching method and shall ensure that the austenite grain size is less than 5 grades.
4.7 Non-metallic inclusions of non-metallic inclusions shall be tested in accordance with ASTM E45 A. Non-metallic inclusions Class A ≤ 3.0, Class B ≤ 2.5, Class C ≤ 2.0, Class D ≤ 2.0. Special requirements can be negotiated between the supplier and the buyer.
4.8 Dense steel pipes shall be tested by eddy current testing in accordance with level B in GB/T 7735, in order to test the compactness of the steel pipes.
4.9 Non-destructive testing of steel pipes shall be carried out by ultrasonic testing at the C8 level in GB/T 5777.
4.10 Surface quality The inner and outer surfaces of steel tubes shall be free of cracks, folds, pleats, delamination, and scabs. These defects shall be completely removed, but the actual wall thickness of the clearing area shall not be less than the minimum allowed by the wall thickness. Special requirements can be negotiated with the user.
Permissible slight bulges, depressions or shallow roll marks due to the manufacturing method, but the outer diameter and wall thickness of the steel tube must be within the allowable dimensional deviation without affecting the serviceability of the steel tube.
5 Inspection and testing, packaging, marking and quality certification Inspection and testing of steel pipes, packaging, markings and quality certificates shall comply with Q/BQB 203 regulations. 1 Scope of Application The provisional technical conditions of this provision stipulate the dimensions, shape, weight, technical requirements, inspection and test, packaging, marking and quality certification of 40CrB structural hot-rolled seamless steel tubes.
This provisional technical condition applies to 40CrB hot-rolled seamless steel tubes used for the manufacture of track pin bushings or other structures produced by Baoshan Iron and Steel Co., Ltd.
2 Normative references The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to reach an agreement based on this standard to study whether the latest version of these documents can be used . For undated references, the latest version is applicable to this standard.
GB/T 222 steel chemical analysis sample sampling method and finished product chemical composition allowable deviation
Decarburization depth of GB/T 224 steel
Hardenability end quenching test method for GB/T 225 steel
GB/T 5777 seamless steel pipe ultrasonic flaw detection method
GB/T 7735 eddy current inspection method for steel pipe
Q/BQB 203 Seamless Steel Pipes for Pipes, Containers and Equipment Structures
ASTM E45 Test Method for Determination of Inclusions in Steel
ASTM E112 Determination of Average Grain Size
3 Size, shape and weight
3.1 The outer diameter and wall thickness of the steel pipe are to comply with the requirements in Tables 1 and 2 of Q/BQB 203. The permissible deviations are to be implemented in accordance with Table 3 and Table 4 of Q/BQB 203.
3.2 The length, shape and weight of the steel pipe are to comply with the requirements of Q/BQB 203.
4 Technical requirements
4.1 Grades and Chemical Composition
4.1.1 Steel grades and chemical composition (smelting analysis) shall comply with the requirements of Table 1.
4.1.2 The allowable deviation of the chemical composition of the finished steel pipe shall comply with the relevant provisions of GB/T 222.
Table 1
Brand chemical composition % C Si Mn P S Cr B 40CrB 0.38 to 0.43 0.15 to 0.35 0.60 to 0.85 ≤ 0.025 0.010 to 0.030 0.90 to 1.20 0.0005 to 0.003
4.2 Smelting method The steel used for the steel pipe is smelted by an electric furnace and refined outside the furnace.
4.3 Delivery status The finished steel pipe is delivered in hot rolled condition.
4.4 Hardenability The circular billet is forged and processed at 870°C to 880°C for normalizing, and processed into standard specimens according to the requirements of GB/T 225. The top quenching is performed at 845±5°C. The hardenability of the round billets is to satisfy:
Special requirements can be negotiated between the supplier and the buyer.
4.5 Each sample of decarburized layer shall be taken on each of two steel pipes, and the inner and outer surface decarburized layer shall be inspected according to GB/T 224. The depth of the total decarburized layer on the inner and outer surfaces is not more than 0.5mm and 1.2mm, respectively.
4.6 Austenite grain size The supplier shall check the austenite grain size according to ASTM E112 using a 930°C 3 hour quenching method and ensure that the austenite grain size is less than 5 grades.
4.7 Non-metallic inclusions of non-metallic inclusions shall be tested in accordance with ASTM E45, Method A. Non-metallic inclusions Class A ≤ 3.0, Class B ≤ 2.5, Class C ≤ 2.0, Class D ≤ 2.0. Special requirements can be negotiated between the supplier and the buyer.
4.8 Dense steel pipes shall be tested by eddy current testing in accordance with level B in GB/T 7735, in order to test the compactness of the steel pipes.
4.9 Non-destructive testing of steel pipes shall be carried out by ultrasonic testing at the C8 level in GB/T 5777.
4.10 Surface quality The inner and outer surfaces of steel tubes shall be free of cracks, folds, pleats, delamination, and scabs. These defects shall be completely removed, but the actual wall thickness of the clearing area shall not be less than the minimum allowed by the wall thickness. Special requirements can be negotiated with the user.
Permissible slight bulges, depressions or shallow roll marks due to the manufacturing method, but the outer diameter and wall thickness of the steel tube must be within the allowable dimensional deviation without affecting the serviceability of the steel tube.
5 Inspection and testing, packaging, marking and quality certification Inspection and testing of steel pipes, packaging, markings and quality certificates shall comply with Q/BQB 203 regulations.
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