GB/T 32957-2016 PDF English
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Cold-drawn or Cold-rolled Precision Inside Diameter Seamless Steel Tube for Hydraulic and Pneumatic System Service
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GB/T 32957-2016: Cold-drawn or Cold-rolled Precision Inside Diameter Seamless Steel Tube for Hydraulic and Pneumatic System Service
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Cold-drawn or Cold-rolled Precision Inside
Diameter Seamless Steel Tube for Hydraulic and
Pneumatic System Service
Issued on: AUGUST 29, 2016
Implemented on: JULY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification and Codes ... 6
4 Order Content... 6
5 Dimensions, Shape, Weight and Tolerances ... 6
6 Technical Requirements ... 3
7 Test Method ... 3
8 Inspection Rules ... 3
9 Packaging, Marking and Quality Certification ... 4
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Steel (SAC/TC 183).
The drafting organizations of this Standard. XCMG Hydraulics Co., Pangang Group
Chengdu Iron & Steel Co., Ltd., Hengyang Valin Steel Tube Co., Ltd., Yichang
Zhongnan Precision Steel Tube Co., Ltd., Wuxi Jiangnan High-precision Cold-drawn
Tube Co., Ltd., Jiangsu Huacheng Industry Pipe Making Corporation, Jiangyin
Hongteng Machinery Co., Ltd., Wuxi Dajin High-precision Cold-drawn Steel Tube Co.,
Ltd., Zhangjiagang Huicheng Pipe-making Co., Ltd. and Zhejiang Lunbao Metal Tube
Industry Co., Ltd.
The main drafters of this Standard. Wang Jiacong, Liu Qingjiao, Li Qi, Zhao Bin, Lu
Fengyun, Zhi Xiangjun, Han Bo, Xi Jinfa, Ren Weijiang, Zhang Hezhong and Zheng
Zhongcai.
Cold-drawn or Cold-rolled Precision Inside
Diameter Seamless Steel Tube for Hydraulic and
Pneumatic System Service
1 Scope
This Standard specifies the classification and codes, order content, dimensions, shape,
weight and tolerances, technical requirements, test method, inspection rules,
packaging, marking and quality certification for cold-drawn or cold-rolled precision
inside diameter seamless steel tube for hydraulic and pneumatic system service.
This Standard applies to cold-drawn or cold-rolled precision inside diameter seamless
steel tube for hydraulic and pneumatic system service of an inside diameter 25 mm to
500 mm.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced document (including any
amendments) applies to this Standard.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron – Determination of Acid-Soluble Silicon and Total
Silicon Content – Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy – the Sodium
Carbonate Separation-Diphenyl Carbazide Photometric Method for the
Determination Of Chromium Content
GB/T 223.23 Iron, Steel and Alloy – Determination of Nickel Content – the
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy – Determination of Molybdenum Content – the
Thiocyanate Spectrophotometric Method
GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy – the Flame
Atomic Absorption Spectrophotometric Method for the Determination of Copper
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 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium
(Potassium) Periodate Photometric Method for the Determination of Manganese
Content
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy – the
Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the
Determination of Sulfur Content
GB/T 223.69 Iron, Steel and Alloy – Determination of Carbon Content – Gas-
volumetric Method after Combustion in the Pipe Furnace
GB/T 228.1 Metallic Materials – Tensile Testing – Part 1. Method of Test at Room
Temperature
GB/T 229 Metallic Materials – Charpy Pendulum Impact Test Method
GB/T 242 Metal Materials – Tube – Drift-expanding Test
GB/T 246 Metal Materials – Tube - Flattening Test
GB/T 699 Quality Carbon Structural Steels
GB/T 1031 Geometrical Product Specifications (GPS) – Surface Texture. Profile
Method – Surface Roughness Parameters and Their Values
GB/T 1591-2008 High Strength Low Alloy 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 3077-2015 Alloy Structure Steels
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission
Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 6394 Metal – Methods for Estimating the Average Grain Size
GB/T 7735-2004 Steel Tubes - The Inspection Method on Eddy Current Test
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 17395 Dimensions, Shapes, Masses and Tolerances of Seamless Steel
Tubes
5.1.1 Steel tube is usually delivered in inside diameter and wall thickness. When the
purchaser requires the supplier to deliver in outside diameter and inside diameter or
outside diameter and wall thickness, it shall be specified in the contract.
5.1.2 The inner diameter and wall thickness of steel tube shall be preferentially
selected from the dimensions listed in Table 1. Steel tubes of other dimensions than
those listed in Table 1 may be supplied after consultation between the supplier and the
purchaser.
5.1.3 For the cold worked (+C and +LC) steel tube, the tolerances of inside diameter
and outside diameter shall meet the specifications of Table 1 and Table 2. For the heat
treated (+SR, +A and +N) steel tube, the tolerances of inside diameter and outside
diameter shall meet the specifications of Table 3.
5.1.4 In accordance with the requirements of the purchaser, steel tubes of other
tolerances than those specified in Table 1, Table 2 and Table 3 can be supplied after
consultation between the supplier and the purchaser; it shall be specified in the
contract.
mm and wall thickness is not more than 10 mm; it shall be specified in the contract.
The taper of the expanding top core is 60°. The expanding rate of outside diameter of
the test pieces after expanding shall meet the specifications of Table 9. No crack or
gap shall be allowed on the test pieces after expanding.
Table 9 Expanding Rates of Steel Tube Drift-expanding Test
Designation
Expanding rate / %
Wall thickness S ≤ 4 mm Wall thickness S > 4 mm
Q345 15 10
25Mn 13 8
6.6 Nondestructive test
In accordance with the requirements of the purchaser, nondestructive test can be done
for steel tube after consultation between the supplier and the purchaser; it shall be
specified in the contract. In the nondestructive test, eddy current inspection is
conducted in accordance with the specifications of acceptance level B in GB/T 7735-
2004; or magnetic flux leakage inspection is conducted in accordance with the
specifications of acceptance level F3 in GB/T 12606-2016.
6.7 Surface roughness
When the purchaser has any requirements on the surface roughness of steel tube, it
shall be specified in the contract. The parameters of surface roughness shall be
determined in accordance with the arithmetical mean deviation of the profile Ra
specified in GB/T 1031; its surface roughness value and sampling length value during
determination shall be subjected to the consultation between the supplier and the
purchaser.
6.8 Surface quality
The inner and outer surfaces of steel tube shall be smooth and free from cracks, folds,
creases, separations and scars. These defects shall be removed completely. The
actual wall thickness of steel tube after removing these defects shall not be less than
the minimum value of the tolerances of wall thickness.
The existence of phosphate and lubricating agent adhesion layer from the
manufacturing process is allowed on the inner and outer surfaces of steel tube; an
oxide film is allowed on the inner surface of steel tube delivered in the heat treatment
state, which does not affect the surface inspection.
6.9 Grain size
The actual grain size of steel tube shall not be lower than grade 5.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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