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.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 5310-2008 Seamless Steel Pipe for High Pressure Boiler, the following main technical changes have been made with respect to GB/T 5310-2008:
——The grade of steel is added;
——The smelting method of stainless steel is modified;
——Total elongation coefficient requirement is added;
——The heat treatment system of 15CrMoG steel pipe is modified;
——Hardness requirements are modified;
——Requirements for surface hardness are added;
——Requirements for flattening and bending tests are modified;
——The grain size requirement is modified;
——The microstructure requirements are modified;
——Depth requirements for decarburization layer are modified;
——Surface quality requirements are modified;
——Specified plastic elongation strength under high temperature of 10Cr9MoW2VNbBN and 07Cr25Ni21NbN are modified;
——Recommended data about endurance strength of 10Cr9MoW2VNbBN, 07Cr25Ni21NbN and 08Cr18Ni11NbFG are modified.
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Technical Committee on Steel of Standardization Administration of China (SAC/ TC 183).
The previous versions of the standards replaced by this standard are as follows:
——GB 5310-1985, GB 5310-1995 and GB/T 5310-2008
Contents
1 Scope 2
2 Normative References 2
3 Classification Code 5
4 Order 5
5 Dimension, Shape, Weight and Deviation 6
6 Technical Requirements 10
7 Sample 31
8 Inspection and Test Method 32
9 Inspection Rules 34
10 Packaging, Marking and Quality Certificate 35
Annex A (Normative) Specified Plastic Elongation Strength at High Temperature 36
Annex B (Informative) Recommended Data on 100,000h Endurance Strength / MPa 38
Amendment No. 1 for National Standard GB/T 5310-2017 Seamless steel tubes and pipes for high pressure boiler
In the original standard: Concerning the mechanical properties of steel tubes in Table 7, clause 6.4.1, for steel tubes with designation of 15CrMoG in the row of No.7, the required Brinell hardness is 125HBW~170HBW and the required Vickers hardness is 125HV~170HV; and for steel tubes with designation of 07Cr25Ni21NbN in the row of No.21, the required Brinell hardness is 175HBW~256 HBW and the required Vickers hardness is 85HRB~100HRB.
Modifications: Concerning the mechanical properties of steel tubes in Table 7, clause 6.4.1, for steel tubes with designation of 15CrMoG in the row of No.7, the required Brinell hardness is 125HBW~195HBW and the required Vickers hardness is 125HV~195HV; and for steel tubes with designation of 07Cr25Ni21NbN in the row of No.21, the required Brinell hardness is 150HBW~256 HBW and the required Vickers hardness is 80HRB~100HRB.
Seamless Steel Tubes and Pipes for High Pressure Boilers
1 Scope
This standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, inspection rules as well as packaging, marking and quality certificate.
This standard is applicable to seamless tubes for manufacturing high-pressure steam boiler or above and seamless tubes used as pipelines.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Allowable Deviation of Chemical Composition of Finished Products
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel And Alloy - Determination of Aluminium Content - Chrom Azurol Sphotometric Method
GH/T 223.11 Determination of Chromium Content in Steel and Alloys - Visual Titration or Potentiometric Titration
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium Content
GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy The Chromotropic Acid Photometric Method for The Determination Of Titanium Content
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content
GB/T 223.23 Iron Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Iron Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method
GB/T 223.29 Iron Steel And Alloy - Determination of Lead Content - Carrier Precipitation-Xylenol Orange Spectrophotometric Method
GB/T 223.30 Methods for Chemical Analysis of Iron, Steel and Alloy - The Arsenazo III Spectrophotometric Method for the Determination of Zirconium Content after Separation by P-Bromomandelic Acid
GB/T 223.31 Iron Steel and Alloy - Determination of Arsenic Content - Distillation-molybdenum Blue Spectrophotometric Method
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neutral Titration Method for the Determination of Nitrogen Content After Distillation Separation
GB/T 223.38 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion-Exchange Separation-Gravimetric Method for the Determination of Niobium Content
GB/T 223.40 Iron Steel and Alloy - Detetmination of Niobium Content by the Sulphochlorophenol Spectrophotometric Method
GB/T 223.43 Iron Steel and Alloy - Determination of Tungsten Content - Gravimetryc Method and Spectrophotometric Method
GB/T 223.47 Methods for Chemical Analysis of Iron, Steel and Alloy - The Carrier Precipitation-Molybdenum Blue Potometric Method for the Determination of Antimony Content
GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy The phenylfuorone-CTMAB Direct Photometric Method for the Determination of Tin Content
GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium Arsenite-Sodium Nitrite Titrimetric Method for the Determination of Manganese Content
GB/T 223.59 Iron Steel and Alloy - Determination of Phosphorus Content - Bismuth phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.67 Iron Steel and Alloy - Determination of Sulfur Content -Methylene Blue Spectrophotometric Method
GB/T 223.69 Iron Steel and Alloy - Determination of Carbon Contents - Gas-volumetric Method after Combustion in the Pipe Furnace
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin Spectrophotometric Method for the Determination of Boron content
GB/T 223.80 Iron Steel and Alloy - Determination of Trace Bismuth and Arsenic Contents - Hydride Generation-atomic Fluorescence Spectrometric Method
GB/T 224 Determination of Depth of Decarburization of Steels
GB/T 226 Low-power Microstructure and Defect Etching Test of Steel
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 228.2 Metallic Materials - Tensile testing - Part 2: Method of Test at Elevated Temperature
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (scales A, B, C, D, E, F, G, H, K, N and T)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method
GB/T 232 Metallic Materials - Bend Test
GB/T 241 Metal Materials - Tube - Hydrostatic Pressure Test
GB/T 242 Metal Materials - Tube - Drift-expending Test
GB/T 246 Metal Materials - Tube - Flattening Test
GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels
GB/T 2102 Acceptance Packing Marking and Quality Certification of Steel Pipe
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1:Test Method
GB/T 5777-2008 Seamless Steel Pipe and Tubing Methods for Ultrasonic Testing
GB/T 6394-2017 Determination of Estimating the Average Grain Size of Metal
GB/T 7735-2016 Automated Eddy Current Testing of Seamless and Welded(except Submerged Arc-welded) Steel Tubes for Detection of Imperfections
GB/T 10561-2005 Steel Determination of Content of Nonmetallic Inclusions Micrographic Method Using Standards Diagrams
GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 12606-2016 Automated Full Peripheral Flux Leakage Testing of Seamless and Welded(except Submerged Arc-Welded) Ferromagnetic Steel Tubes for the Detection of Longitudinal and/or Transverse Imperfections
GB/T 1329S Inspection Methods of Microstructure for Metals
GB/T 15822 Non-destructive Testing - Magnetic Particle Testing
GB/T 17395 Dimensions Shapes Masses and Tolerances of Seamless Steel Tubes
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content Infrared Absorption Method after Combustion in an Induction Furnace (Routine Method)
GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal conductimetric Method after Fusion in a Current of Inert Gas
GB/T 31925-2015 Ultrasonic Test Methods of Heavy Wall Thickness Seamless Steel Pipes and Tubes
NB/T 47013.5 Nondestructive Testing of Pressure-Bearing Equipment - Part 5: Penetrant Testing
YB/T 4149 Continuously Cast Round Billet for Seamless Steel tube and pipe Rolling
YB/T 5137 Classification and Designation of Round Tube Blank 3 for Hot Rolling and Forging Seamless Steel Tubes for High Pressure Application
3 Classification Code
3.1 Seamless steel pipe of this standard is divided into two classes according to the product manufacturing method; its class and code are as follows:
a) Hot rolled (extruded, expanded) steel tubes, with code name of W-H ;
b) Cold drawn (rolled) steel pipe., with code name of W-C.
3.2 For the purpose of this document, the following codes apply.
D——the outside Diameter, (including the outside diameter in mm, unless otherwise stated)
S——the wall thickness (including the nominal wall thickness and the average wall thickness in mm, unless otherwise stated)
Smin——the minimum wall thickness
d——the nominal inside diameter
Dc——the calculated outside diameter (outside diameter value in millimeters calculated by the sum of nominal inside diameter and nominal wall thickness)
Sc——the average wall thickness (the average of the maximum and minimum wall thicknesses, in millimeters, calculated by the minimum wall thickness and its allowable deviation)
4 Order
Contracts or orders for steel pipes ordered in accordance with this standard shall include, but not be limited to the followings:
a) Product name;
b) Standard number;
c) Grade of steel;
d) Quantity ordered (total weight or total length);
e) Dimension and specification;
f) Special requirements
5 Dimension, Shape, Weight and Deviation
5.1 Outside diameter and wall thickness
5.1.1 Unless otherwise specified in the contract, the steel tubes are delivered by outside diameter and wall thickness. Upon request by the purchaser and after negotiation between the purchaser and the supplier, the steel tubes may be delivered by nominal outside diameter and minimum wall thickness, nominal inside diameter and nominal wall thickness or other dimensions and specifications.
5.1.2 Outside diameter and wall thickness of steel tubes shall be in accordance with those specified in GB/T 17395. Upon the request by the purchaser and after negotiation between the purchaser and the supplier, the steel tubes with dimensions beyond those specified in GB/T 17395 can be supplied. If delivered by nominal inside diameter and nominal wall thickness, the dimension and specification shall be agreed by both sides.
5.1.3 If delivered by nominal outside diameter and nominal wall thickness, the permissible deviations shall be in accordance with those specified in Table 1.
5.1.4 If delivered by nominal outside diameter and minimum wall thickness, the permissible deviations of outside diameter shall be in accordance with those specified in Table 1, and the permissible deviations of wall thickness shall be in accordance with those specified in Table 2.
5.1.5 If delivered by nominal inside diameter and nominal wall thickness, the permissible deviations of nominal inside diameter shall be ±1%d, and that of nominal wall thickness shall be in accordance with those specified in Table 1.
5.1.6 If the purchaser doesn’t indicate the permissible deviations of steel tubes in the contract, the permissible deviations of outside diameter and wall thickness shall meet the requirements for normal grades. Upon request by the purchaser, after the negotiation between the purchaser and the supplier and in accordance with those stated in the contract, the steel tubes with permissible deviations of dimensions other than those specified in Table 1 and Table 2 can be supplied.
1 Scope
2 Normative References
3 Classification Code
4 Order
5 Dimension, Shape, Weight and Deviation
6 Technical Requirements
7 Sample
8 Inspection and Test Method
9 Inspection Rules
10 Packaging, Marking and Quality Certificate
Annex A (Normative) Specified Plastic Elongation Strength at High Temperature
Annex B (Informative) Recommended Data on 100,000h Endurance Strength / MPa
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.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 5310-2008 Seamless Steel Pipe for High Pressure Boiler, the following main technical changes have been made with respect to GB/T 5310-2008:
——The grade of steel is added;
——The smelting method of stainless steel is modified;
——Total elongation coefficient requirement is added;
——The heat treatment system of 15CrMoG steel pipe is modified;
——Hardness requirements are modified;
——Requirements for surface hardness are added;
——Requirements for flattening and bending tests are modified;
——The grain size requirement is modified;
——The microstructure requirements are modified;
——Depth requirements for decarburization layer are modified;
——Surface quality requirements are modified;
——Specified plastic elongation strength under high temperature of 10Cr9MoW2VNbBN and 07Cr25Ni21NbN are modified;
——Recommended data about endurance strength of 10Cr9MoW2VNbBN, 07Cr25Ni21NbN and 08Cr18Ni11NbFG are modified.
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Technical Committee on Steel of Standardization Administration of China (SAC/ TC 183).
The previous versions of the standards replaced by this standard are as follows:
——GB 5310-1985, GB 5310-1995 and GB/T 5310-2008
Contents
1 Scope 2
2 Normative References 2
3 Classification Code 5
4 Order 5
5 Dimension, Shape, Weight and Deviation 6
6 Technical Requirements 10
7 Sample 31
8 Inspection and Test Method 32
9 Inspection Rules 34
10 Packaging, Marking and Quality Certificate 35
Annex A (Normative) Specified Plastic Elongation Strength at High Temperature 36
Annex B (Informative) Recommended Data on 100,000h Endurance Strength / MPa 38
Amendment No. 1 for National Standard GB/T 5310-2017 Seamless steel tubes and pipes for high pressure boiler
In the original standard: Concerning the mechanical properties of steel tubes in Table 7, clause 6.4.1, for steel tubes with designation of 15CrMoG in the row of No.7, the required Brinell hardness is 125HBW~170HBW and the required Vickers hardness is 125HV~170HV; and for steel tubes with designation of 07Cr25Ni21NbN in the row of No.21, the required Brinell hardness is 175HBW~256 HBW and the required Vickers hardness is 85HRB~100HRB.
Modifications: Concerning the mechanical properties of steel tubes in Table 7, clause 6.4.1, for steel tubes with designation of 15CrMoG in the row of No.7, the required Brinell hardness is 125HBW~195HBW and the required Vickers hardness is 125HV~195HV; and for steel tubes with designation of 07Cr25Ni21NbN in the row of No.21, the required Brinell hardness is 150HBW~256 HBW and the required Vickers hardness is 80HRB~100HRB.
Seamless Steel Tubes and Pipes for High Pressure Boilers
1 Scope
This standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, inspection rules as well as packaging, marking and quality certificate.
This standard is applicable to seamless tubes for manufacturing high-pressure steam boiler or above and seamless tubes used as pipelines.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Allowable Deviation of Chemical Composition of Finished Products
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel And Alloy - Determination of Aluminium Content - Chrom Azurol Sphotometric Method
GH/T 223.11 Determination of Chromium Content in Steel and Alloys - Visual Titration or Potentiometric Titration
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium Content
GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy The Chromotropic Acid Photometric Method for The Determination Of Titanium Content
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content
GB/T 223.23 Iron Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Iron Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method
GB/T 223.29 Iron Steel And Alloy - Determination of Lead Content - Carrier Precipitation-Xylenol Orange Spectrophotometric Method
GB/T 223.30 Methods for Chemical Analysis of Iron, Steel and Alloy - The Arsenazo III Spectrophotometric Method for the Determination of Zirconium Content after Separation by P-Bromomandelic Acid
GB/T 223.31 Iron Steel and Alloy - Determination of Arsenic Content - Distillation-molybdenum Blue Spectrophotometric Method
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neutral Titration Method for the Determination of Nitrogen Content After Distillation Separation
GB/T 223.38 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion-Exchange Separation-Gravimetric Method for the Determination of Niobium Content
GB/T 223.40 Iron Steel and Alloy - Detetmination of Niobium Content by the Sulphochlorophenol Spectrophotometric Method
GB/T 223.43 Iron Steel and Alloy - Determination of Tungsten Content - Gravimetryc Method and Spectrophotometric Method
GB/T 223.47 Methods for Chemical Analysis of Iron, Steel and Alloy - The Carrier Precipitation-Molybdenum Blue Potometric Method for the Determination of Antimony Content
GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy The phenylfuorone-CTMAB Direct Photometric Method for the Determination of Tin Content
GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium Arsenite-Sodium Nitrite Titrimetric Method for the Determination of Manganese Content
GB/T 223.59 Iron Steel and Alloy - Determination of Phosphorus Content - Bismuth phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.67 Iron Steel and Alloy - Determination of Sulfur Content -Methylene Blue Spectrophotometric Method
GB/T 223.69 Iron Steel and Alloy - Determination of Carbon Contents - Gas-volumetric Method after Combustion in the Pipe Furnace
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin Spectrophotometric Method for the Determination of Boron content
GB/T 223.80 Iron Steel and Alloy - Determination of Trace Bismuth and Arsenic Contents - Hydride Generation-atomic Fluorescence Spectrometric Method
GB/T 224 Determination of Depth of Decarburization of Steels
GB/T 226 Low-power Microstructure and Defect Etching Test of Steel
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 228.2 Metallic Materials - Tensile testing - Part 2: Method of Test at Elevated Temperature
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (scales A, B, C, D, E, F, G, H, K, N and T)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method
GB/T 232 Metallic Materials - Bend Test
GB/T 241 Metal Materials - Tube - Hydrostatic Pressure Test
GB/T 242 Metal Materials - Tube - Drift-expending Test
GB/T 246 Metal Materials - Tube - Flattening Test
GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels
GB/T 2102 Acceptance Packing Marking and Quality Certification of Steel Pipe
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1:Test Method
GB/T 5777-2008 Seamless Steel Pipe and Tubing Methods for Ultrasonic Testing
GB/T 6394-2017 Determination of Estimating the Average Grain Size of Metal
GB/T 7735-2016 Automated Eddy Current Testing of Seamless and Welded(except Submerged Arc-welded) Steel Tubes for Detection of Imperfections
GB/T 10561-2005 Steel Determination of Content of Nonmetallic Inclusions Micrographic Method Using Standards Diagrams
GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 12606-2016 Automated Full Peripheral Flux Leakage Testing of Seamless and Welded(except Submerged Arc-Welded) Ferromagnetic Steel Tubes for the Detection of Longitudinal and/or Transverse Imperfections
GB/T 1329S Inspection Methods of Microstructure for Metals
GB/T 15822 Non-destructive Testing - Magnetic Particle Testing
GB/T 17395 Dimensions Shapes Masses and Tolerances of Seamless Steel Tubes
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content Infrared Absorption Method after Combustion in an Induction Furnace (Routine Method)
GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal conductimetric Method after Fusion in a Current of Inert Gas
GB/T 31925-2015 Ultrasonic Test Methods of Heavy Wall Thickness Seamless Steel Pipes and Tubes
NB/T 47013.5 Nondestructive Testing of Pressure-Bearing Equipment - Part 5: Penetrant Testing
YB/T 4149 Continuously Cast Round Billet for Seamless Steel tube and pipe Rolling
YB/T 5137 Classification and Designation of Round Tube Blank 3 for Hot Rolling and Forging Seamless Steel Tubes for High Pressure Application
3 Classification Code
3.1 Seamless steel pipe of this standard is divided into two classes according to the product manufacturing method; its class and code are as follows:
a) Hot rolled (extruded, expanded) steel tubes, with code name of W-H ;
b) Cold drawn (rolled) steel pipe., with code name of W-C.
3.2 For the purpose of this document, the following codes apply.
D——the outside Diameter, (including the outside diameter in mm, unless otherwise stated)
S——the wall thickness (including the nominal wall thickness and the average wall thickness in mm, unless otherwise stated)
Smin——the minimum wall thickness
d——the nominal inside diameter
Dc——the calculated outside diameter (outside diameter value in millimeters calculated by the sum of nominal inside diameter and nominal wall thickness)
Sc——the average wall thickness (the average of the maximum and minimum wall thicknesses, in millimeters, calculated by the minimum wall thickness and its allowable deviation)
4 Order
Contracts or orders for steel pipes ordered in accordance with this standard shall include, but not be limited to the followings:
a) Product name;
b) Standard number;
c) Grade of steel;
d) Quantity ordered (total weight or total length);
e) Dimension and specification;
f) Special requirements
5 Dimension, Shape, Weight and Deviation
5.1 Outside diameter and wall thickness
5.1.1 Unless otherwise specified in the contract, the steel tubes are delivered by outside diameter and wall thickness. Upon request by the purchaser and after negotiation between the purchaser and the supplier, the steel tubes may be delivered by nominal outside diameter and minimum wall thickness, nominal inside diameter and nominal wall thickness or other dimensions and specifications.
5.1.2 Outside diameter and wall thickness of steel tubes shall be in accordance with those specified in GB/T 17395. Upon the request by the purchaser and after negotiation between the purchaser and the supplier, the steel tubes with dimensions beyond those specified in GB/T 17395 can be supplied. If delivered by nominal inside diameter and nominal wall thickness, the dimension and specification shall be agreed by both sides.
5.1.3 If delivered by nominal outside diameter and nominal wall thickness, the permissible deviations shall be in accordance with those specified in Table 1.
5.1.4 If delivered by nominal outside diameter and minimum wall thickness, the permissible deviations of outside diameter shall be in accordance with those specified in Table 1, and the permissible deviations of wall thickness shall be in accordance with those specified in Table 2.
5.1.5 If delivered by nominal inside diameter and nominal wall thickness, the permissible deviations of nominal inside diameter shall be ±1%d, and that of nominal wall thickness shall be in accordance with those specified in Table 1.
5.1.6 If the purchaser doesn’t indicate the permissible deviations of steel tubes in the contract, the permissible deviations of outside diameter and wall thickness shall meet the requirements for normal grades. Upon request by the purchaser, after the negotiation between the purchaser and the supplier and in accordance with those stated in the contract, the steel tubes with permissible deviations of dimensions other than those specified in Table 1 and Table 2 can be supplied.
Contents of GB/T 5310-2017
1 Scope
2 Normative References
3 Classification Code
4 Order
5 Dimension, Shape, Weight and Deviation
6 Technical Requirements
7 Sample
8 Inspection and Test Method
9 Inspection Rules
10 Packaging, Marking and Quality Certificate
Annex A (Normative) Specified Plastic Elongation Strength at High Temperature
Annex B (Informative) Recommended Data on 100,000h Endurance Strength / MPa
