GB/T 41750-2022 English PDF (GBT41750-2022)

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GB/T 41750-2022: Titanium and titanium alloy square and rectangular tubes
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;