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GB/T 40393-2021 English PDF (GBT40393-2021)

GB/T 40393-2021 English PDF (GBT40393-2021)

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GB/T 40393-2021: Corrosion of metals and alloys -- Accelerated corrosion test for intergranular corrosion susceptibility of austenitic stainless steels
GB/T 40393-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.060
CCS H 25
Corrosion of metals and alloys -- Accelerated corrosion test
for intergranular corrosion susceptibility of austenitic
stainless steels
(ISO 21610:2009, MOD)
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Specimens ... 6
5 Test methods ... 11
6 Evaluation of intergranular corrosion ... 13
7 Test report ... 17
Appendix A (Informative) The technical differences between this document and ISO
21610:2009 (including their reasons) ... 18
Appendix B (Informative) Recommended sizes of standard specimens and the chemical
and electrolytic cleaning steps to remove corrosion products ... 20
References ... 23
Corrosion of metals and alloys -- Accelerated corrosion test
for intergranular corrosion susceptibility of austenitic
stainless steels
Warning -- Some of the reagents used in this test method are corrosive and shall
be handled with care. If the skin is splashed by it, rinse immediately with water;
severe cases shall be treated immediately.
1 Scope
This document specifies an accelerated test method for determining the susceptibility
to intergranular corrosion of austenitic stainless steel.
This document applies to the testing of a variety of metal products, including double
rolled metal, welded joints, deposited metal, and weld metal.
Note 1: The results obtained by this method are the same as those obtained by the methods in the ISO
3651-1 and ISO 3651-2 standards, but the accelerated corrosion test cycle is shorter.
Note 2: This document specifies two test methods:
--- Method A: Corrosion test in copper sulfate and concentrated sulfuric acid solutions in the presence
of metallic copper;
--- Method B: Corrosion test in copper sulfate, sulfuric acid, and copper fluoride solutions in the
presence of metallic copper.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 10123 Corrosion of metals and alloys -- Basic terms and definitions (GB/T
10123-2001, ISO 8044:1999, IDT)
ISO 3651(all parts) Determination of resistance to intergranular corrosion of
stainless steels
a) For plate specimens, segmental specimens, cylindrical specimens with a diameter
not exceeding 5 mm, and tubular specimens with a diameter not exceeding 5 mm,
angle bending should be (90±3)°;
b) Annular and tubular specimens with a diameter exceeding 5 mm should be
flattened and formed into cones;
c) Examine the curved surfaces in cross-sectional regions with sufficient thickness
to identify intergranular cracks.
4.4 Machining the blank to prepare the specimen of the required thickness:
a) The metal plate should be sampled from one side only; if one of the sides is treated,
then take samples from the treated side;
b) The rolled metal (rolled sections and profiles), forgings, castings, and tubular
samples should be sampled from a suitable surface;
c) The hot-deformed or cold-deformed pipe should be sampled from the outside;
d) The hot-rolled pipe should be sampled from the inner or outer surface;
e) The pipe that has been exposed to the service environment should be sampled
from the side that is in contact with the service environment.
4.5 The following kinds and types of specimens should be prepared from welded joints
(see Table 2):
--- Prepare Type I or Type II plate specimens from welded joints of plate metal, rolled
sections, castings or forgings;
--- Prepare Type II annular, tubular, or segmental specimens from electric welded
pipes;
--- Prepare Type I segmental, annular, or tubular specimens from girth welded joints
of pipe sections;
--- Prepare Type I or II plate specimens, or Type I segmental, annular, or tubular
specimens from welded joints of double-wall tubes.
4.6 For welded specimens (Table 2, Type I and Type II), the weld reinforcement should
be removed with a depth not exceeding 1 mm.
The required thickness of the specimen should be achieved by machining, and the metal
should be removed from the side that is not in contact with the corrosive medium. If it
is not sure which side is in contact with the corrosive medium, the machining should be
processed on the side where the weld metal is least heated during the welding process.
If it is necessary to reduce the wall thickness of the specimen, sampling should be
carried out in accordance with 4.4.
4.7 The inspection of electrodes, filler wires, and strips shall be carried out through the
fabricated surfacing or weld metal.
The surfacing metal shall be tested with plate specimens (see Table 2). The specimen
shall be cut from the multi-layer surfacing metal made of the inspected welding material
(the surfacing metal substrate is not used for specimen preparation, and can be prepared
from materials with similar chemical compositions). When the chemical composition
of the metal substrate is similar to that of the surfacing metal, the number of surfacing
metal substrates not used for specimen preparation can be reduced to 3 layers.
The weld metal is tested with plate specimens cut from the upper layer of the multi-
layer welded seam of the welded joint. The welded seam thickness of the cut specimen
area should not be less than 15 mm. The chemical composition of the plate used for the
welded joint should be similar to the chemical composition of the weld metal.
Welded backing plates can be used when using thin plates to obtain the welded seam of
desired thickness. The chemical composition of the steel for welded backing plate is
similar to the thin plate. When welding the edge of the thin plate specimen initially, the
entire surface of the welded backing plate should be similarly treated.
Weld metal testing should be carried out on plate welded specimens (see Types I and II
in Table 2) prepared from specially-made welded joints. The welded joints are made of
intergranular-corrosion-resistant steel and welding consumables to be evaluated.
4.8 The recommended size of the specimen is shown in Appendix B, and different
specimen sizes can also be used.
4.9 When testing plates, pipes, metal profiles, wires, and strips, at least two specimens
should be prepared for each group.
For all types of steels and alloys, at least 4 specimens (two of which are used for
comparison) should be prepared for each forging, casting, and weldment.
The control specimen should be bent 90°±3° and not be exposed to the boiling test
solution. If the specimen needs to be inspected from both sides, then the specimen
should be bent into a “Z” shape.
4.10 The sensitization treatment of unstabilized steel is as follows: on the premise of no
special requirements in the technical documents, if the unstabilized steel does not
contain titanium or niobium, the maximum carbon content is greater than 0.03% and it
is used under the delivery conditions, then the sensitization treatment test should be
carried out on the specimen of the delivery conditions.
 (11±1)mL HNO3 (ρ20=1.35 g/mL);
 (955±3)mL H2O;
 Temperature: 40 °C~50 ...
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