GB/T 12771-2019 English PDF
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GB/T 12771: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 12771-2019 | 185 | Add to Cart | Auto, 9 seconds. | Welded Stainless Steel Pipes for Fluid Transport | Valid |
| GB/T 12771-2008 | 85 | Add to Cart | Auto, 9 seconds. | Welded stainless steel pipes for liquid delivery | Obsolete |
| GB/T 12771-2000 | 559 | Add to Cart | 4 days | Welded stainless steel pipes for liquid delivery | Obsolete |
| GB/T 12771-1991 | 479 | Add to Cart | 4 days | Welded stainless steel pipes for liquid delivery | Obsolete |
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GB/T 12771-2019: Welded Stainless Steel Pipes for Fluid Transport
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12771-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.75 H 48 Replacing GB/T 12771-2008 Welded Stainless Steel Pipes for Fluid Transport Issued on. OCTOBER 18, 2019 Implemented on. SEPTEMBER 1, 2020 Issued by. State Administration for Market Regulation; 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 Dimensions, Appearance and Weight... 8 6 Technical Requirements... 12 7 Test Methods... 20 8 Inspection Rules... 21 9 Packaging, Marking and Quality Certificate... 221 Scope
This Standard stipulates the classification, code, order content, dimensions, appearance and weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of welded stainless steel pipes for fluid transport. This Standard is applicable to welded stainless steel pipes for fluid transport (hereinafter referred to as steel pipes).2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products; GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum 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 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content; GB/T 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neocuproine Chloroform Extraction Photometric 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;3 Classification and Code
3.1 In accordance with manufacturing method and radiographic testing, the classification and code of steel pipes are as follows. 3.2 In accordance with delivery status, the classification and code of steel pipes are as follows.4 Order Content
Contract or order form that purchase steel pipes in accordance with this Standard shall include the following content.5 Dimensions, Appearance and Weight
5.1 External Diameter and Wall Thickness Nominal external diameter (D) and nominal wall thickness (S) of steel pipes shall comply with the stipulations in GB/T 21835.In accordance with the demand-side’s demands, through the negotiation between the demand-side and the supply-side, steel pipes of other external diameters and wall thicknesses may also be provided. 5.2 Allowable Deviation of External Diameter and Wall Thickness 5.3 Length 5.3.1 Generally speaking, the length of steel pipes is 3,000 mm ~ 12,000 mm. 5.3.2 In accordance with the demand-side’s demands, through the negotiation between the demand-side and the supply-side, and statement in the contract, steel pipes may be delivered in accordance with specified length or multiple length. The specified length of total multiple length of steel pipes shall be within a general range; the full-length allowable deviation is. In terms of steel pipes which are delivered in accordance with multiple length, each incision shall retain a margin of 5 mm ~ 10 mm. 5.4 Out-of-roundness Out-of-roundness of steel pipes shall not exceed the allowable tolerance of external diameter. The difference between the maximum value and the minimum value of external diameter actually measured on any cross section of thin-wall steel pipes shall not exceed 1% of nominal external diameter. 5.5 Curvature Curvature of steel pipes shall be not more than 1.5 mm/m; full-length curvature shall be not more than 0.2% of the total length of steel pipes. 5.7 Weight Steel pipes may be delivered in accordance with the theoretical weight, or, the actual weight. When steel pipes are delivered in accordance with the theoretical weight, theoretical weight shall be calculated in accordance with Formula (1).6 Technical Requirements
6.1 Designation and Chemical Composition of Steel 6.1.1 Designation and chemical composition (smelting analysis) of steel shall comply Designation Formula (1) after Conversion Density /(kg/dm3) No. Type Uniform Digital Code 6.1.2 When the demand-side requests for analysis of finished products, it shall be indicated in the contract. The allowable deviation of chemical composition of finished steel pipes shall comply with the stipulations in GB/T 222. 6.2 Manufacturing Methods 6.2.1 Smelting methods of steel Steel shall adopt the smelting method of converter plus secondary furnace refining, or, electric-arc furnace plus secondary furnace refining. Through the negotiation between the demand-side and the supply-side, and statement in the contract, other smelting methods with more rigorous requirements may also be adopted. 6.2.2 Manufacturing methods of steel pipes 6.3 Delivery Status 6.3.1 Steel pipes shall be delivered under the status of thermal treatment and acid pickling. Through the negotiation between the demand-side and the supply-side, and statement in the contract, steel pipes may also be delivered under the status of welding. Please refer to Table 4 for the recommended thermal treatment systems of steel pipes. 6.3.2 Steel pipes that go through overall polishing, boring or thermal treatment with protective atmosphere may be delivered without acid pickling. 6.4 Mechanical Properties 6.4.1 Tensile Steel pipes shall receive tensile test on base metals. The room-temperature longitudinal tensile performance of base metals shall comply with the stipulations in Table 4. 6.5 Process Performance 6.5.1 Flattening Steel pipes whose external diameter is not more than 168 mm shall receive flattening test. During the test, welding seam shall be located in a location that is 90 of the force- bearing direction. In terms of steel pipes which receive thermal treatment, samples shall be flattened to 1/3 of the external diameter of steel pipes. In terms of steel pipes which do not receive thermal treatment, samples shall be flattened to 2/3 of the external diameter of steel pipes. After flattening, samples shall not manifest any cracks or breakages. 6.6 Intergranular Corrosion Except from designations, the remaining Austenitic stainless steel pipes shall receive intergranular corrosion test in accordance with the stipulations of Method E in GB/T 4334-2008.After the test,7 Test Methods
7.1 The analysis and sampling for the chemical composition test of steel pipes shall be conducted in accordance with the rules in GB/T 20066.Generally speaking, the analysis of chemical composition shall be conducted in accordance with GB/T 11170, GB/T 20123, GB/T 20124, or other universal methods. The arbitration shall comply with the stipulations in GB/T 223.9, GB/T 223.11, GB/T 223.18, GB/T 223.19, GB/T 223.23, GB/T 223.25, GB/T 223.26, GB/T 223.28, GB/T 223.36, GB/T 223.37, GB/T 223.40, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223.68, GB/T 223.69, GB/T 223.84, GB/T 223.85, GB/T 223.86. 7.2 Dimensions and appearance of steel pipes shall be measured one by one through measuring instruments that comply with the requirements of accuracy. 7.3 The internal and external surface quality of steel pipes shall be visually inspected one by one under the condition of thorough illumination. The surplus height of welding seam shall be measured through measuring instruments that comply with the requirements of accuracy. 7.4 The sampling methods and test methods of other tests of steel pipes shall comply with the stipulations in Table 5.8 Inspection Rules
8.1 Inspection and Acceptance Inspection The inspection and acceptance inspection of steel pipes shall be conducted by the supply-side’s quality and technology supervision department. 8.2 Batch Rules The chemical composition of steel pipes may be inspected and accepted in accordance with furnace. The remaining inspection items of steel pipes shall be inspected and accepted in accordance with batch. Each batch shall be constituted of steel pipes of the same designation, the same furnace No., the same dimensions, the same welding process and the same thermal treatment system. The quantity of each batch of steel pipes shall not exceed the following stipulations. 8.3 Sampling Quantity The sampling quantity of steel pipes for each inspection item shall comply with the stipulations in Table 5. 8.4 Re-inspection and Determination Rules Re-inspection and determination rules of steel pipes shall comply with the stipulations in GB/T 2102.9 Packaging, Marking and Quality Certificate
9.1 The marking of steel pipes shall include the code, which is classified in accordance with manufacturing method and radiographic testing. The remaining requirements shall comply with the stipulations in GB/T 2102.Example 1 and Example 2 provide marking examples of steel pipes. 9.2 The packaging and quality certificate of steel pipes shall comply with the stipulations in GB/T 2102. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
