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GB/T 41750-2022 PDF English


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GB/T 41750-2022: PDF in English (GBT 41750-2022)

GB/T 41750-2022 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.150.50 CCS H 64 Titanium and titanium alloy square and rectangular tubes ISSUED ON: OCTOBER 12, 2022 IMPLEMENTED ON: MAY 1, 2023 Issued by: State Administration for Market Regulation; Standardization Administration of PRC. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 5 4 Categories ... 5 5 Technical requirements ... 6 6 Test method ... 8 7 Inspection rules ... 9 8 Marking, packaging, transportation, storage, and accompanying documents ... 11 9 Order form contents ... 12 Titanium and titanium alloy square and rectangular tubes 1 Scope This document specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, accompanying documents, and order form contents of titanium and titanium alloy square and rectangular tubes. This document applies to titanium and titanium alloy square tubes and rectangular tubes. 2 Normative references The following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document. GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 3620.1 Designation and composition of titanium and titanium alloys GB/T 3620.2 Titanium and titanium alloys. Permissible variations of chemical composition for wrought product analysis GB/T 3621 Titanium and titanium alloy plate and sheet GB/T 4698 (all parts) Methods for chemical analysis of titanium sponge, titanium and titanium alloys GB/T 6611 Terminology and metallographs for titanium and titanium alloys GB/T 8180 Wrought titanium and titanium alloy products packing, marking, transporting and storing GB/T 38982 Method of measuring shape and dimension for wrought titanium and titanium alloy products NB/T 47013.5-2015 Nondestructive testing of pressure equipment - Part 5: Penetrant testing Description of indexing symbols: b --- Pipe width; h --- Pipe height; t --- Pipe wall thickness; R --- Radius of the outer fillet. Figure 1 -- Schematic diagram of the cross-sectional shape of a pipe 5 Technical requirements 5.1 Base metal The plates used for welding square tubes and rectangular tubes shall meet the requirements of the corresponding grades of plates in GB/T 3621, and shall be accompanied by a quality certificate. 5.2 Chemical composition 5.2.1 The chemical composition of the product shall meet the requirements of GB/T 3620.1. 5.2.2 When the buyer takes samples from the product for chemical composition retesting, the allowable deviation of the chemical composition shall comply with the provisions of GB/T 3620.2. 5.3 Dimensions and their allowable deviations 5.3.1 The dimensions of the product and their allowable deviations shall comply with the provisions in Table 2. 5.3.2 The side concavity and convexity X1 and X2 of the product shall not exceed 1.5% of the side length. Indented dimensions are not included in the dimension tolerances. 5.3.3 The curvature of the product shall not exceed 2 mm/m, and the total curvature shall not exceed 0.15% of its length. 6.3 Tensile properties The test of the tensile properties of the product at room temperature shall be carried out according to the method specified in GB/T 228.1. 6.4 Penetration test The penetration test of the product shall be carried out according to the method specified in NB/T 47013.5-2015. 6.5 Appearance quality The test of the appearance quality of the product shall be carried out by visual inspection. 7 Inspection rules 7.1 Inspection and acceptance 7.1.1 Products shall be inspected by the supplier or a third party. 7.1.2 The buyer can inspect the received products according to the provisions of this document. When the inspection results are inconsistent with the provisions of this document or the purchase order, it shall be reported to the supplier in written form, and the supplier and the buyer shall negotiate to resolve it. Objections pertaining to dimensions and their allowable deviations, penetration test and appearance quality shall be raised within one month from the date of receipt of the product; objections pertaining to chemical composition and tensile properties shall be raised within three months from the date of receipt of the product. If arbitration is required, the supply and demand parties shall sample jointly on the demand side, or it shall be negotiated by the supply and demand parties. 7.2 Batching double samples shall be taken from this batch of products for repeated inspection. If there is still an unqualified sample in the repeated inspection, the batch of products shall be judged as unqualified. However, the supplier can inspect the pipes one by one, and the qualified ones can be delivered in batches again. 8 Marking, packaging, transportation, storage, and accompanying documents 8.1 Marking 8.1.1 Product marking Labels or tags shall be attached to the products that have passed the inspection, and the following contents shall be indicated at least on them: a) The name and trademark of the manufacturer; b) Grade; c) Specifications; d) State; e) Batch number; f) Number of this document. 8.1.2 Packaging marks The packaging marks of the products shall comply with the provisions of GB/T 8180. 8.2 Packaging, transportation, and storage The packaging, transportation, and storage of the products shall comply with the provisions of GB/T 8180. 8.3 Accompanying documents Each batch of products shall be attached with accompanying documents, which shall not only include supplier information, product information, serial number of this document, date of manufacture or date of packaging, but also include: a) Quality certificate, the contents are as follows:  Product name, grade, specification, and state; ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.