Skip to product information
1 of 7

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 21832.2-2018 English PDF (GBT21832.2-2018)

GB/T 21832.2-2018 English PDF (GBT21832.2-2018)

Regular price $150.00 USD
Regular price Sale price $150.00 USD
Sale Sold out
Shipping calculated at checkout.
Delivery: 3 seconds (Download full-editable-PDF + Invoice).
Quotation: Click GB/T 21832.2-2018>>Add to cart>>Quote
Editable-PDF Preview (Reload if blank, scroll for next page)

GB/T 21832.2-2018: Welded austenitic-ferritic (duplex) stainless steel tubes and pipes -- Part 2: Pipes for fluid transport
This Part of GB/T 21832 specifies the ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification for welded austenitic-ferritic (duplex) stainless steel pipes for fluid transport. This Part applies to welded austenitic-ferritic (duplex) stainless steel pipes for fluid transport.
GB/T 21832.2-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 21832-2008
Welded austenitic-ferritic (duplex) stainless steel
tubes and pipes -- Part 2. Pipes for fluid transport
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. FEBRUARY 1, 2019
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 Ordering content ... 7
4 Dimensions, shape and weight ... 7
5 Technical requirements ... 9
6 Test methods ... 15
7 Inspection rules ... 16
8 Packaging, marking and quality certification ... 16
Foreword
GB/T 21832, Welded austenitic-ferritic (duplex) grade stainless steel tubes and pipes, comprises two parts.
-- Part 1. Tubes for heat exchanger;
-- Part 2. Pipes for fluid transport.
This Part is Part 2 of GB/T 21832.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part of GB/T 21832 partly replaces GB/T 21832-2008, Austenitic-ferritic (duplex) grade stainless steel welded tubes and pipes; and the content not replaced is Tubes for heat exchanger, which is incorporated into Part 1 of GB/T 21832.
Compared with GB/T 21832-2008, the major technical changes of this Part are as follows.
-- it changes the standard tile;
-- it changes the normative references (see Clause 2; Clause 2 of edition 2008); -- it deletes the classification and codes (see Clause 3 of edition 2008); -- it changes the allowable deviations of nominal outer diameter (see 4.1.2; 5.1.2 of edition 2008);
-- it adds full-length deflection (see 4.2);
-- it changes the smelting method of steels (see 5.2.1; 6.2.1 of edition 2008); -- it changes the manufacturing method of steel tubes and pipes (see 5.2.2; 6.2.2 of edition 2008);
-- it deletes the polished delivery condition (see 6.3.2 of edition 2008); -- it changes the tensile test requirements for welded joints (see 5.4.2; 6.4.2 of edition 2008);
-- it changes the nondestructive testing requirements for welds (see 5.8; 6.8 of edition 2008);
-- it changes the requirements for weld reinforcements (see 5.9.3; 6.9.3 of edition 2008);
Welded austenitic-ferritic (duplex) stainless steel
tubes and pipes -- Part 2. Pipes for fluid transport
1 Scope
This Part of GB/T 21832 specifies the ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification for welded austenitic-ferritic (duplex) stainless steel pipes for fluid transport. This Part applies to welded austenitic-ferritic (duplex) stainless steel pipes for fluid transport (hereinafter referred to as steel pipes).
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 documents (including all amendments) applies to this document.
GB/T 222, Permissible tolerances for chemical composition of steel products 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 223.25, Methods for chemical analysis of iron, steel and alloy -- The dimethylglyoxime gravimetric method for the determination of nickel content GB/T 223.26, Iron, steel and alloy -- Determination of molybdenum content -- The thiocyanate spectrophotometric method
GB/T 223.28, Methods for chemical analysis of iron steel and alloy -- The α- denzoinoxime gravimetric method for the determination of molybdenum content GB/T 11170, Stainless steel -- Determination of multi-element contents -- Spark discharge atomic emission spectrometric method (Routine method)
GB/T 13305, Micrographic method for determining area content of the α-phases in stainless steels
GB/T 20066, Steel and iron-sampling and preparation of samples for the
determination of chemical composition
GB/T 20123, Steel and iron -- Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20124, Steel and iron -- Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas
GB/T 21835, Dimensions and masses per unit length of welded steel pipes NB/T 47013.2, Nondestructive testing of pressure equipment - Part 2. Radiographic testing
NB/T 47013.11, Nondestructive testing of pressure equipment - Part 11. Standard practice for X-ray digital radiography
3 Ordering content
Contracts or orders for purchase of steel pipes based on this Part shall include the following content.
a) a reference to this Part;
b) product name;
c) steel designation;
d) dimensions (outer diameter × wall thickness, in mm);
e) quantity ordered;
f) special requirements.
4 Dimensions, shape and weight
4.1 Outer diameter and wall thickness
5.4.3 Hardness
5.4.3.1 Rockwell hardness or Brinell hardness test for based metals can be carried out for steel pipes of wall thickness not less than 1.7 mm in accordance with the requirements of the purchaser, which shall be as agreed on by the purchaser and the supplier and stated in contracts. When hardness test is specified in contracts, their hardness number shall be as specified in Table 3.
5.4.3.2 Vickers hardness test can be carried out for steel pipes in accordance with the requirements of the purchaser, which shall be as agreed on by the purchaser and the supplier and stated in contracts. Their hardness number shall be as agreed on by the supplier and the purchaser.
5.5 Processing properties
5.5.1 Flattening
Flattening test shall be carried out for steel pipes of outer diameter not greater than 219 mm. During the flattening test, welds shall be located at a location forming an angle 90° to the force application direction. Sample shall be pressed until the distance between two plates is H. H is calculated in accordance with Formula (2). After the flattening test, sample shall be free from cracks and gaps.
where.
H -- the distance between parallel pressing plates after flattening, in mm; α -- the deformation coefficient per unit length, taking 0.07;
S -- the nominal wall thickness of steel pipes, in mm;
D -- the nominal outer diameter of steel pipes, in mm.
5.5.2 Bend of welded joints
5.5.2.1 Bend test of welded joints shall be carried out for steel pipes of outer diameter greater than 219 mm. Bend samples shall be cut along the lateral direction of steel pipes or from test pieces for welding. Test pieces for welding and steel pipes shall be of the same designation, heat number, welding process and heat treatment system. 5.5.2.2 A bend test shall include one face bend test and one back bend test (i.e. the outer weld and inner weld of steel pipes are located at the maximum bend surface respectively). For steel pipes of wall thickness greater than 10 mm, one group of two side bend tests can be used to replace face bend test and back bend test. 5.8.2 Radiographic testing can be carried out before heat treatment.
5.9 Surface quality
5.9.1 Surface defects
The inner-outer surfaces of steel pipes shall be smooth, without cracks, lack of penetration, weld sags, folds and layers. These defects shall be removed completely; the removing depth shall not exceed the lower deviation of nominal wall thickness; the actual wall thickness at the removing spots shall not be less than the minimum value allowed by wall thickness.
5.9.2 Repair welding
Repair welding is allowed for weld defects of steel pipes. After repair welding, the welds shall be subjected to local radiographic testing and surface quality inspection. The steel pipes to be delivered in the heat-treated condition shall be subjected to heat treatment after repair welding.
5.9.3 Weld reinforcements
5.9.3.1 The outer weld reinforcements of steel pipes shall not exceed 2 mm. 5.9.3.2 The reinforcements of inner welds shall comply with the following specifications. a) not greater than 10% of wall thickness for steel pipes of D < 140 mm; b) not greater than 15% of wall thickness and not greater than 2 mm for steel pipes of D ≥ 140 mm ~ 325 mm;
c) not greater than 20% of wall thickness and not greater than 3 mm for steel pipes of D > 325 mm.
5.10 Special requirements
When the purchaser has the following special requirements, they shall be as agreed on by the supplier and the purchaser and stated in contracts.
a) corrosion test;
b) impact test of welded joints;
c) detrimental intermetallic phase detection.
View full details