Detail of GB/T 4437.2-2017

Introduction of GB/T 4437.2-2017

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. GB/T 4437 comprises two parts under the general title of Aluminum and Aluminum Alloy Extruded Tubes: ——Part 1: Seamless Tubes; ——Part 2: Seam Tubes. This is Part 2 of GB/T 4437. This part is developed in accordance with the rules specified in GB/T 1.1-2009. This part replaces GB/T 4437.2-2003 Aluminum and Aluminum Alloy Extruded Tubes—Part 2: Seam Tubes. In addition to editorial changes, the following technical changes have been made with respect to GB/T 4437.2 -2003. ——Added designations 6101, 6101 B, 6105, 6351, 6060, 6082 and 7003 to the product classification (see 3.1.1); ——Added H112 status of alloy 5052, T6 status of alloys 6005 and 6005A, T1 status of alloy 6005A, T5 status of alloy 6061, and T1 status of alloy 6063 to the product classification (see 3.1.1); ——Added tube type of surface treatment, surface treatment method, and specification of coating coding to the product classification (see 3.1.2); ——Added mechanical properties of alloys 6101, 6101B, 6105, 6351, 6060, 6082, and 7003 (see 3.4); ——Added mechanical properties of H112 status of alloy 5052, T6 status of alloy 6005, T1 and T6 status of alloy 6005A, T5 status of alloy 6061, and T1 status of alloy 6063 (see 3.4); ——Added conductivity of T6 and T7 status of alloy 6101 B (see 3.5); ——Added requirements of coating performance (see 3.8); ——Modified indicators of mechanical properties in 1070A, 1060, 1050A, 1035, 1100, 1200, 2A11, 2A11, 2017, 2A12, 2024, 3003, 2A11, 2017, 2A12, 2024, 3003, 6005, 6005A, 6061, 6063, 6063A (see 3.4 hereof and 3.4 in 2003 edition): ——Modified requirements of the standard size, by direct reference to GB/T 4436 (see 3.3 hereof and 3.3 in 2003 edition). This part was proposed by China Nonferrous Metals Industry Association. This standard is under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC 243). Previous edition of the standard replaced by this part is as follows: ——GB/T 4437.2-2003. Aluminum and Aluminum Alloy Extruded Tubes —Part 2：Seam tubes 1 Scope This part of GB/T 4437 specifies requirements, test methods, inspection rules and marking, packaging, transportation, storage and quality certificates and the contents of order (or contract) for aluminum and aluminum alloy extruded tubes produced by shunt single split mold or bridge-type single split mold. This part is applicable to shunt single split mold or bridge type single split mold produced by aluminum and aluminum alloy seamed round tube, rectangular tube and regular polygon pipe (hereinafter referred to as tube). 2 Normative References The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references; the latest edition of the referenced document (including any amendments) applies. GB/T 3190 Wrought Aluminum and Aluminum Alloy—Chemical Composition GB/T 3199 Aluminum and Aluminum Alloy Products—Packaging, Marking, Transportation and Storage GB/T 3246.1 Wrought Aluminum and Aluminum Alloys Products Inspection Method for Structure—Part 1: Inspection Method for Microstructure GB/T 3246.2 Wrought Aluminum and Aluminum Alloys Products Inspection Method for Structure—Part 2: Macroscopic Structure Inspection Method GB/T 4436-2012 Aluminum and Aluminum Alloy Tubes—Dimensions and Deviations GB/T 7999 Optical Emission Spectrometric Analysis Method of Aluminum and Aluminum Alloys GB/T 8013.1 Anodic Oxide Coating and Organic Polymer Coatings on Aluminum And Its Alloys—Part 1: Anode Oxide Film GB/T 8013.2 Anodic Oxide Coating and Organic Polymer Coatings on Aluminum and Its Alloys—Part 2: Composite Anodized Coating GB/T 8013.3 Anodic Oxide Coating and Organic Polymer Coatings on Aluminum and Its Alloys—Part 3: Organic Polymer Spraying Membrane GB/T 8170 Rules of Rounding Off for Numerical Values & Expression and Judgment of Limiting Values GB/T 12966 Test Method of Aluminum Alloy Conductance Eddy Current GB/T 16865 Wrought Aluminum, Magnesium and Its Alloys Processed Products—Tensile Test Sample and Method GB/T 17432 Methods of Sampling for Analyzing the Chemical Composition of Wrought Aluminum and Aluminum Alloy GB/T 20975 (All Parts) Methods for Chemical Analysis of Aluminum And Aluminum Alloys 3 Requirements 3.1 Product classification 3.1.1 Designation and supply status Designation and supply status of tube shall be in accordance with those specified in Table1. When other designation or status is required, it shall be as negotiated between the supplier and the purchaser and be specified in the order form (or contract). Table 1 Designation and Supply Status NO. Supply Status 1050A, 1060, 1070A, 1035, 1100, 1200 O, H112 2017, 2A11, 2A12, 2024 O,T1,T4 3003 O,H112 5A02 H112 5052 O,H112 5A03,5A05 H112 5A06,5083,5454,5086 O,H112 6A02 O,T1,T4,T6 6101 T6 6101B T6,T7 6005 T5,T6 6005A T1,T5,T6 6105 T6 6351 T6 6060 T5,T6,T66 6061 T4,T5,T6 6063 T1,T4,T5,T6 6063A T5,T6 6082 T4,T6 7003 T6 3.1.2 Category, surface treatment mode, and coating code of surface treatment tube See Table 2 for the category, surface treatment mode and coating code of surface treatment tube, .   Table 2 Category, Surface Treatment Mode and Coating Code of Surface Treatment Tube Category Surface treatment mode Coating code Remarks Anodizing tube Anodizing, electrolytic coloring or dyeing AA5, AA10, AA15, AA20, AA25 AA—represents anodizing category; the number after AA represents the minimum average film thickness limit of the anodized film Electrophoretic coating tube Anodizing, coloring and electrophoretic coating (water-soluble varnish or paint) composite treatment EA21, EA16, EA13 EA—represents anodizing + bright or matte clear paint category; the number after EA represents the minimum local film thickness limit value of anodizing and electrophoretic coating composite film ES21 ES—represents anodizing + bright or matte colored paint category; the number after the ES represents the minimum local film thickness limit value of the anodizing and electrophoretic coating composite film Dusting tube Electrostatic spraying with coating of thermosetting polyester, polyurethane, chlorotrifluoroethylene-vinyl ether (FEVE) powder and thermoplastic polyvinylidene fluoride (PVDF) powder GA40 GA—represents the category of powder film of polyester; GU—represents the powder film of polyurethane; GF—represents the category of powder film of fluorocarbon; GO—represents other powder film category; the number after GA, GU, GF and GO represents the minimum local film thickness limit GU40 GF40 GO40 Painting spray tube Electrostatic spraying with coating of acrylic paint LB17 LB—represents the category of acrylic paint spraying; the number after LB represents the minimum local film thickness limit Electrostatic spraying with coating of organic solvent type or aqueous solvent-based polyvinylidene fluoride (PVDF) paint Second coating (primer and topcoat) LF2-25 LF2—represents fluorocarbon paint spraying-second coating categories; the number after LF2 represents the minimum local film thickness limit Third coating (primer, topcoat and varnish) LF3-34 LF3—represents fluorocarbon paint spraying-third coating category; the number after LF3 represents the minimum local film thickness limit Fourth coating (primer, protective coat, topcoat and varnish) LF4-55 LF4—represents fluorocarbon paint spraying—fourth coating category; the number after LF4 represents the minimum local film thickness limit 3.1.3 Marking and example Product markings are expressed in the order of product name or surface treatment tube category, reference of this part, designation, supply status, section size, length, color (or color code), film layer code. Examples of marking are as follows: Example 1: Extruded seam round tube of 6063 designation, T6 status, outer diameter 40.00 mm, wall thickness 6.00 mm, specified lengths 4,000 mm, marked as: Round tube GB/T 4437.2-6063T6-φ40×6×4 000 Example 2: Non-fixed extruded seam tubes of 2A12 designation, T4 status, 20.00 mm long, 15.00 mm wide, and 2.00 mm thick of rectangular section, marked as: Rectangular tube GB/T 4437.2-2A12T4-20×15×2 Example 3: Regular hexagon extruded seamed tube of 1100 designation, H112 status, circumcircle diameter of 140.00 mm, wall thickness of 4.00 mm, and specified length of 3000 mm, marked as: Regular hexagon tube GB/T 4437.2-1100H112-φ140×4×3 000 Example 4: Anodizing round tube of 6063 designation, T6 status, outside diameter of 40.00 mm, wall thickness of 6.00 mm, specified length of 4000 mm, silvery white, coating code of AA10, marked as: Anodizing tube GB/T 4437.2-6063T5-φ40×6×4 000 Silvery white AA10 Example 5: Non-fixed electrophoretic coating tube of 6063 designation, T5 status, rectangular section length of 20.00 mm, width of 15.00 mm, wall thickness of 2.00 mm, black, and coating code of EA 21, marked as: Electrophoretic coating tube GB/T 4437.2-6063T5-20×15×2 Black EA21 Example 6: Dusting tube of 6063 designation, T5 status, circumcircle diameter of 140.00 mm, wall thickness of 4.00 mm, specified lengths of 3000 mm, gray, and coating code of GA40 Dusting tube GB/T 4437.2-6063T5-φ140×4φ3 000 Gray GA40 Example 7: Non-fixed painting spray tube of 6063 designation, T5 status, rectangular section length of 20.00 mm, width of 15.00 mm, wall thickness of 2.00 mm, red, and coating code of LF2-25, marked as: Painting spray tube GB/T 4437.2-6063T5-20×15×2 Red LF2-25 3.2 Chemical composition Chemical composition of tube shall meet the requirements of GB/T 3190.

Contents of GB/T 4437.2-2017

Foreword i 1 Scope 2 Normative References 3 Requirements 4 Test Methods 5 Inspection Rules 6 Marking, Packaging, Transportation and Storage 7 Contents of Order (or Contract)