GB/T 14975-2012 English PDF (GBT14975-2012)
GB/T 14975-2012 English PDF (GBT14975-2012)
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GB/T 14975-2012: Seamless stainless steel tubes for structure
GB/T 14975-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 14975-2002
Seamless stainless steel tubes for structure
ISSUED ON: NOVEMBER 05, 2012
IMPLEMENTED ON: MAY 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Classification and code ... 7
4 Order content ... 8
5 Size, shape and weight ... 8
6 Technical requirements ... 12
7 Test methods ... 22
8 Inspection rules ... 23
9 Packaging, marks and quality certificate ... 24
Annex A (informative) Comparison on stainless steel designation ... 25
Seamless stainless steel tubes for structure
1 Scope
This Standard specifies the classification and code, order content, size, shape,
weight, technical requirements, test methods, inspection rules, packaging,
marks and quality certificate for seamless stainless steel tubes for structure.
This Standard is applicable to seamless stainless steel tubes for general
structure or mechanical structure (hereinafter referred to as steel tubes).
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, Permissible tolerances for chemical composition of steel products
GB/T 223.9, Iron steel and alloy - Determination of aluminium content -
Chrome azurol S photometric method
GB/T 223.11, Iron, Steel and Alloy - Determination of Chromium Content -
Visual Titration or Potentiometric Titration Method
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 223.28, Methods for chemical analysis of iron, steel and alloy - The α-
benzoin oxime gravimetric method for the determination of molybdenum
GB/T 246, Metallic materials – Tube - Flattening test
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 4334-2008, Corrosion of metals and alloys - Test methods for
intergranular corrosion of stainless steels
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 7735-2004, Steel tubes - The Inspection Method on Eddy Current Test
GB/T 11170, Stainless steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (Routine method)
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 20878-2007, Stainless and heat-resisting steels - Designation and
chemical composition
3 Classification and code
3.1 Steel tubes are divided into two categories according to product processing
methods. The category and code name are:
- Hot rolled (extruded, expanded) steel tubes W-H;
- Cold drawn (rolled) steel tubes W-C.
3.2 Steel tubes are divided into two levels according to the dimensional
6.1.2 When the purchaser requires finished product analysis, it shall be
indicated in the contract. The allowable deviation of the chemical composition
of the finished steel tubes shall meet the requirements of GB/T 222.
6.2 Manufacturing method
6.2.1 Steel smelting method
Steel shall be smelted with crude molten steel through external refining method.
Agreed by the supplier and the purchaser, other smelting methods may be used.
6.2.2 Manufacturing method of steel tubes
Steel tubes shall be manufactured by hot rolled (extruded, expanded) or cold
drawn (rolled) seamless method. Hot-expanded steel tubes shall refer to a
larger diameter steel tubes formed by expansion and deformation of the blank
steel tubes after being heated as a whole. When the purchaser specifies a
certain manufacturing method, it shall be indicated in the contract.
6.3 Delivery status
6.3.1 Steel tubes shall be delivered in a heat-treated and pickled state. All steel
tubes that have been integrally ground, bored or heat-treated in a protective
atmosphere can be delivered without pickling. Refer to Table 4 for the
recommended heat treatment system for finished steel tubes.
6.3.2 For austenitic hot extruded steel tubes, if the heat treatment temperature
range specified in Table 4 is followed by direct water cooling or other rapid
cooling, it shall be considered that the heat treatment requirements of steel
tubes have been met.
6.3.3 Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, austenitic cold drawn (rolled) steel tubes can also be
delivered in cold working condition. The curvature, mechanical properties,
flattening test shall be negotiated between the supplier and the purchaser.
6.3.4 Agreed by the supplier and the purchaser and indicated in the contract,
steel tubes can use other heat treatment systems other than those specified in
Table 4.
6.4 Mechanical properties
6.4.1 The longitudinal mechanical properties (tensile strength Rm and
elongation after fracture A) of the heat-treated steel tubes shall meet the
requirements of Table 4.
6.4.2 Required by the purchaser, agreed by the supplier and the purchaser and
P - The test pressure, in megapascals (MPa), rounded off to the nearest 0.5MPa;
S - The nominal wall thickness of steel tubes, in millimeters (mm);
D - The nominal outer diameter of steel tubes, in millimeters (mm);
R - The allowable stress, 60% of the minimum plastic elongation strength
specified in Table 4, in megapascals (MPa).
Under the test pressure, the voltage stabilization time shall be no less than 5s,
and leakage of the steel tubes is not allowed.
6.6.2 Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, other test pressures can be used for hydraulic test.
6.6.3 The supplier can replace the hydraulic test with ultrasonic test or eddy
current test. When ultrasonic flaw detection is used, the artificial defects of the
comparison sample tube shall meet the requirements of the acceptance level
L3 in GB/T 5777-2008. When using eddy current flaw detection, the artificial
defect of the control sample tube shall meet the requirements of the acceptance
level A in GB/T 7735-2004.
6.7 Intergranular corrosio...
Get QUOTATION in 1-minute: Click GB/T 14975-2012
Historical versions: GB/T 14975-2012
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GB/T 14975-2012: Seamless stainless steel tubes for structure
GB/T 14975-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 14975-2002
Seamless stainless steel tubes for structure
ISSUED ON: NOVEMBER 05, 2012
IMPLEMENTED ON: MAY 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Classification and code ... 7
4 Order content ... 8
5 Size, shape and weight ... 8
6 Technical requirements ... 12
7 Test methods ... 22
8 Inspection rules ... 23
9 Packaging, marks and quality certificate ... 24
Annex A (informative) Comparison on stainless steel designation ... 25
Seamless stainless steel tubes for structure
1 Scope
This Standard specifies the classification and code, order content, size, shape,
weight, technical requirements, test methods, inspection rules, packaging,
marks and quality certificate for seamless stainless steel tubes for structure.
This Standard is applicable to seamless stainless steel tubes for general
structure or mechanical structure (hereinafter referred to as steel tubes).
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, Permissible tolerances for chemical composition of steel products
GB/T 223.9, Iron steel and alloy - Determination of aluminium content -
Chrome azurol S photometric method
GB/T 223.11, Iron, Steel and Alloy - Determination of Chromium Content -
Visual Titration or Potentiometric Titration Method
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 223.28, Methods for chemical analysis of iron, steel and alloy - The α-
benzoin oxime gravimetric method for the determination of molybdenum
GB/T 246, Metallic materials – Tube - Flattening test
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 4334-2008, Corrosion of metals and alloys - Test methods for
intergranular corrosion of stainless steels
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 7735-2004, Steel tubes - The Inspection Method on Eddy Current Test
GB/T 11170, Stainless steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (Routine method)
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 20878-2007, Stainless and heat-resisting steels - Designation and
chemical composition
3 Classification and code
3.1 Steel tubes are divided into two categories according to product processing
methods. The category and code name are:
- Hot rolled (extruded, expanded) steel tubes W-H;
- Cold drawn (rolled) steel tubes W-C.
3.2 Steel tubes are divided into two levels according to the dimensional
6.1.2 When the purchaser requires finished product analysis, it shall be
indicated in the contract. The allowable deviation of the chemical composition
of the finished steel tubes shall meet the requirements of GB/T 222.
6.2 Manufacturing method
6.2.1 Steel smelting method
Steel shall be smelted with crude molten steel through external refining method.
Agreed by the supplier and the purchaser, other smelting methods may be used.
6.2.2 Manufacturing method of steel tubes
Steel tubes shall be manufactured by hot rolled (extruded, expanded) or cold
drawn (rolled) seamless method. Hot-expanded steel tubes shall refer to a
larger diameter steel tubes formed by expansion and deformation of the blank
steel tubes after being heated as a whole. When the purchaser specifies a
certain manufacturing method, it shall be indicated in the contract.
6.3 Delivery status
6.3.1 Steel tubes shall be delivered in a heat-treated and pickled state. All steel
tubes that have been integrally ground, bored or heat-treated in a protective
atmosphere can be delivered without pickling. Refer to Table 4 for the
recommended heat treatment system for finished steel tubes.
6.3.2 For austenitic hot extruded steel tubes, if the heat treatment temperature
range specified in Table 4 is followed by direct water cooling or other rapid
cooling, it shall be considered that the heat treatment requirements of steel
tubes have been met.
6.3.3 Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, austenitic cold drawn (rolled) steel tubes can also be
delivered in cold working condition. The curvature, mechanical properties,
flattening test shall be negotiated between the supplier and the purchaser.
6.3.4 Agreed by the supplier and the purchaser and indicated in the contract,
steel tubes can use other heat treatment systems other than those specified in
Table 4.
6.4 Mechanical properties
6.4.1 The longitudinal mechanical properties (tensile strength Rm and
elongation after fracture A) of the heat-treated steel tubes shall meet the
requirements of Table 4.
6.4.2 Required by the purchaser, agreed by the supplier and the purchaser and
P - The test pressure, in megapascals (MPa), rounded off to the nearest 0.5MPa;
S - The nominal wall thickness of steel tubes, in millimeters (mm);
D - The nominal outer diameter of steel tubes, in millimeters (mm);
R - The allowable stress, 60% of the minimum plastic elongation strength
specified in Table 4, in megapascals (MPa).
Under the test pressure, the voltage stabilization time shall be no less than 5s,
and leakage of the steel tubes is not allowed.
6.6.2 Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, other test pressures can be used for hydraulic test.
6.6.3 The supplier can replace the hydraulic test with ultrasonic test or eddy
current test. When ultrasonic flaw detection is used, the artificial defects of the
comparison sample tube shall meet the requirements of the acceptance level
L3 in GB/T 5777-2008. When using eddy current flaw detection, the artificial
defect of the control sample tube shall meet the requirements of the acceptance
level A in GB/T 7735-2004.
6.7 Intergranular corrosio...