NB/T 47016-2023 English PDF (NB/T47016-2023)

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NB/T 47016-2023: Mechanical property tests of product welded test coupons for pressure equipments
NB/T 47016-2023
NB
ENERGY INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.160
CCS H 22
Replacing NB/T 47016-2011
Mechanical property tests of product welded test coupons
for pressure equipments
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JUNE 28, 2024
Issued by: National Energy Administration
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 General ... 6
5 Test coupon preparation ... 7
6 Mechanical properties test category and specimen of test coupon ... 9
7 Inspection method and qualified index ... 11
8 Retest ... 23
9 Other tests ... 24
Mechanical property tests of product welded test coupons
for pressure equipments
1 Scope
This document specifies the preparation of welded test coupons, specimen preparation,
inspection methods, qualified indicators for pressure equipment (boilers, pressure
vessels and pressure pipes).
This document is applicable to the mechanical and bending performance tests of welded
test coupons (including welded test plates, simulation rings, certification rings) of steel,
aluminum, titanium, copper, nickel, and zirconium pressure equipment products.
This document is not applicable to the mechanical and bending performance tests of
welded test coupons of gas cylinder products.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 228 (all parts) Metallic materials - Tensile testing at ambient temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 2652 Destructive tests on welds in metallic materials - Longitudinal tensile
test on weld metal in fusion welded joints
GB/T 2653 Bend test methods on welded joints
GB/T 3375 Welding terminology
NB/T 47014 Welding procedure qualification for pressure equipments
3 Terms and definitions
The terms and definitions defined in GB/T 3375 and NB/T 47014 apply to this
document. If there is any inconsistency, the terms and definitions of NB/T 47014 shall
prevail.
4 General
4.1 In addition to complying with the provisions of this document, the mechanical
property inspection of product welded test coupons shall also comply with the
provisions of relevant safety technical specifications, standards, design documents.
4.2 The materials used for the test coupons shall be taken from qualified raw materials;
they shall be of the same standard, code (designation, steel grade), specification (limited
thickness), heat treatment state as the materials of the pressure equipment components
they represent. When S11348 (06Cr13Al) steel is used to weld pressure equipment
without post-weld heat treatment, the parent material of the test coupon shall include
steel plates of each heat number.
4.3 Welded test coupons for pressure equipment products are divided into plate test
coupons and tubular test coupons; tubular test coupons refer to pipes and rings.
4.4 Welding of product welded test coupons:
a) Plate test coupons of welded joints of longitudinal seams (including the spliced
joints of heads) shall be placed at the extended position of their welds and welded
at the same time as the welds they represent;
b) Tubular test coupons or plate test coupons used for welded joints of
circumferential seams shall be welded during the welding procedure of the
pressure equipment components they represent;
c) Plate test coupons of welded joints of spherical containers shall be welded during
the welding procedure of the manufacturing stage and installation stage of the
pressure equipment components they represent.
4.5 Test coupon welding procedure
4.5.1 When the inspected welded joints undergo different welding procedures, the
welding procedure and conditions experienced by the test coupon shall be the same as
those of the welded joints they represent.
4.5.2 The welder of the test coupon shall be selected from the welders who weld the
pressure equipment components.
4.5.3 The test coupon shall be prepared according to the prepared special welding
procedure documents. The test coupon code, work order number or pressure equipment
number, and material code shall be clearly stated in the welding procedure documents.
4.5.4 The test coupon shall have welding records.
4.6 After the test coupon has been inspected visually and tested non-destructively, it is
different, 3 impact specimens shall be taken from the heat-affected zone on each
side;
c) For composite metals, only impact specimens shall be made on the base except as
specified in the design documents;
d) Low-carbon steel, Q345R and chromium-nickel austenitic steel test coupons can
be exempted from the heat-affected zone impact test;
e) For aluminum-magnesium alloys with a magnesium content exceeding 3%, only
the weld zone impact specimen shall be taken.
6.5 Specimen position
6.5.1 The sampling position of plate test coupons shall be as shown in Figure 1.
6.5.2 The sampling position of tubular test coupons shall be as shown in Figure 2.
6.6 The length of the discarded part at both ends of the test coupon varies with the
welding method and plate thickness. It shall not be less than 30 mm for manual welding;
it shall be not less than 40 mm for motorized welding and automatic welding.
6.7 The specimen blank is cut by cold working method, or hot working method;
however, the oxide layer and other materials need to be removed by cold working
method to expose the metallic luster.
6.8 After the specimen passes the inspection and marked, it is stamped with a steel
stamp or permanent mark.
7 Inspection method and qualified index
7.1 Tensile test
7.1.1 Joint tensile specimen
7.1.1.1 Sampling and processing requirements:
a) The tensile specimen shall include the welded joints of each welding method (or
welding procedure with different important factors) on the test coupon.
b) For composite metals, when the coating thickness is involved in the strength
calculation of the composite plate, the tensile specimen includes the coating and
the base layer; when the coating thickness is not involved in the strength
calculation of the composite plate, the tensile specimen removes the coating, the
transition layer weld metal in the base layer is not removed.
c) The weld excess of the specimen shall be removed by cold working method, to
the tensile surface of the face bending and back bending specimens shall be flush;
there shall be no scratches and damage on the tensile surface of the specimen.
b) The face bending and back bending specimens shall be in accordance with the
provisions of Figure 7 and Table 3.
1) The parent material category with serial number 1 in Table 3:
When T > 3 mm, take S = 3 mm and remove the excess thickness from the
compressive surface of the specimen;
When T ≤ 3 mm, S is as close to T as possible.
2) The parent material category other than serial number 1 in Table 3:
When T > 10 mm, take S = 10 mm and remove the excess thickness from the
compressive surface of the specimen;
When T ≤ 10 mm, S is as close to T as possible.
3) For plate and tubular test coupons with an outer diameter of Φ > 100 mm, the
specimen width B = 38 mm; when the outer diameter Φ of the tubular test
coupon is 50 mm ~ 100 mm, then and 8 mm ≤ B ≤ 38 mm;
when 10 mm ≤ Φ < 50 mm, then and the minimum is 8 mm; or
when Φ ≤ 25 mm, the test coupon is divided into four equal parts in the
circumferential direction for sampling.
c) See Figure 8 and Table 3 for transverse side bending specimens.
1) The thickness of the specimen with serial number 1 in Table 3 is 3 mm; the
thickness of the specimens other than serial number 1 in Table 3 is 10 mm.
2) When the specimen thickness T ≥ 10 mm, the specimen width B is close to or
equal to the test coupon thickness; however, when the test coupon thickness T
≥ 38 mm, it is allowed to test two or more specimens with a width B of 20 mm
~ 38 mm which is cut in the direction of the specimen thickness in a layered
manner instead of a full-width side bending specimen.
inclusion or other internal defects shall be counted.
If the specimen thickness T ≥ 38 mm and two or more specimens are used, each
specimen shall meet the above requirements.
For composite metal materials produced by rolling composite method and explosive
welding method, re-sampling test is allowed for delamination and cracks caused by
unbonded defects in the composite interface of the side bending specimen.
7.3 Impact test
7.3.1 The weld metal and heat affected zone of each welding method (or welding
procedure with different supplementary factors) shall be subjected to Charpy V-notch
impact test.
7.3.2 Impact specimen:
a) Orientation: The longitudinal axis of the specimen shall be perpendicular to the
weld axis; the Charpy V-notch axis shall be perpendicular to the surface of the
parent material.
b) Sampling position: The sampling position on the thickness of the specimen is
shown in Figure 9; when a combined welding method is used, if the weld metal
and heat affected zone of a certain welding method (or welding procedure with
different supplementary factors) are not within the sampling range of Figure 9,
separate sampling can be performed on the test coupon.
c) Notch position: The notch axis of the weld metal specimen shall be located on the
center line of the weld.
The distance k -- from the notch axis of the heat-affected zone specimen to the
intersection of the longitudinal axis of the specimen and the fusion line -- is > 0
mm; it shall pass through the heat-affected zone as much as possible, see Figure
10 for details.