JB/T 4744-2000 PDF English
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| JB/T 4744-2000 | English | 95 |
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[=NB/T 47016-2011] Mechanical property tests of product welded test coupons for steel pressure vessels
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JB/T 4744-2000: [=NB/T 47016-2011] Mechanical property tests of product welded test coupons for steel pressure vessels
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT4744-2000
ICS 19.160
H 22
INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
NB/T 47016-2011 (JB/T 4744)
Replacing JB 4744-2000
Mechanical Property Tests of Product Welded Test
Coupons for Pressure Equipment
ISSUED ON: JULY 01, 2011
IMPLEMENTED ON: OCTOBER 01, 2011
Issued by: National Energy Administration
NB
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative Reference ... 5
3 General Provisions ... 5
4 Coupon Preparation ... 7
6 Inspection Method and Qualified Indexes ... 10
7 Reinspection... 22
Announcement (Corrigendum) ... 24
Mechanical Property Tests of Product
Welded Test Coupons for Pressure Equipment
1 Scope
This standard specifies the preparation, sample preparation, inspection method and
qualified indexes for pressure equipment’s (boiler, pressure vessels and pressure
piping) product welded coupons.
This standard is applicable to the inspection of mechanical property and bending
property for steel, aluminum, titanium, copper and nickel pressure equipment’s
product welded coupons.
The product welded coupons include product weld test plate, product inspection
coupons, simulating loop and certification loop.
This standard is not applicable to gas cylinders.
2 Normative Reference
The following referenced documents are indispensable references, only the edition
cited applies. For dated references, only the dated edition of the normative reference
referred to applies. For the undated normative references, the latest editions
(including all amendments) apply.
GB/T 228 Metallic Materials - Tensile Testing
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 2653 Bend Test Methods on Welded Joints
NB/T 47014 Welding Procedure Qualification for Pressure Equipment
3 General Provisions
3.1 In addition to the requirements of this standard, the inspection of mechanical
property for product welded coupons shall also be in accordance with the relevant
requirements of safety technical codes, standards and design documents.
3.2 Materials used for coupons shall be of the same standard, code (mark and steel
different; three impact samples shall be taken at each side of heat affected zone.
5.4.3 Except for requirements of design documents, the composite metal shall be
prepared of impact sample only at the basement layer.
5.4.4 Impact test at heat affected zone of low carbon steel, Q345R and austenitic
chromium-nickel steel coupons is permissible to be omitted.
5.4.5 Aluminum magnesium alloy whose magnesium content exceeds 3% shall be
prepared of impact samples only at the weld zone.
5.5 Sample position
5.5.1 The sampling position of plate sample is detailed in Figure 1; the impact
sample position used for reinspection remains unchanged.
5.5.2 The sampling position of tubulous coupons is detailed in Figure 2.
5.6 The length of rejection part at both ends of coupons shall be subject to welding
method and plate thickness, it shall not be less than 30mm for manual welding, and
not be less than 40mm for motorized welding and automatic welding. If there are arc
starting plate and run off plate, the parts at the both ends of coupon may be rejected
or not.
5.7 Sample blank shall be made with cold process and hot working method but the
heat affected zone shall be neglected.
5.8 After the sample inspection is qualified and marked with lines, steel seal or
permanent marking shall be printed.
6 Inspection Method and Qualified Indexes
6.1 Tensile test
6.1.1 Tensile samples for joints
6.1.1.1 Sampling and processing requirements:
a) Tensile samples shall be taken from the heat affected zone and each kind of
weld metal of each welding method (or welding process);
b) As for composite metal, where the coating thickness is involved in calculating
the composite board strength, the tensile sample shall include the coating and
basement layer; where the coating thickness is not involved in calculating the
composite board strength, the tensile sample shall omit the coating and its
weld metal;
3) The specified minimum tensile strength value of titanium base metal equals
to the tensile strength lower limiting value specified in the annealed state
standard;
4) The specified minimum tensile strength value of copper base metal equals
to the smaller value of tensile strength lower limiting values specified in the
annealed and other state standard;
Where the tensile strength lower limiting value for extruding copper product
specified in annealed state is not given out in standards, it can be
determined according to 90% of tensile strength lower limiting value
specified in original state or according to the results of experimental
investigation;
5) The specified minimum tensile strength value of nickel base metal equals to
the specified tensile strength lower limiting value of base metal in annealed
state (only for Ni-1 and Ni -2) or solid solution condition (only for Ni -3, Ni -4
and Ni -5);
b) Where the sample base metals are of two kinds of metal material codes, the
tensile strength of each sample shall not be less than the smaller value of the
specified minimum tensile strength values of these two base metals in this
standard:
c) Samples which the coating thickness is involved in calculating the design
strength of composite metallic material, the tensile strength Rm of each sample
shall meet:
21
2m211m
m tt
tRtRR
Where,
Rm1 - The specified minimum tensile strength value of coating, the unit is MPa;
Rm2 - The specified minimum tensile strength value of base metal, the unit is
MPa;
t1 - The coating thickness;
T2 - The basement layer thickness
d) Where weld metal is required whose room-temperature tensile strength is
lower than the base metal, the tensile strength of each sample shall not be
less than the specified minimum value of weld metal tensile strength.
e) If break happens on the above-mentioned samples base metal which excludes
the welding seam or fusion line, the tensile strength value shall not be less
than 95% of the minimum value of base metal tensile strength specified in this
standard; in this way the test can be regarded as qualified.
6.1.4.2 All-welded tensile test:
a) The tensile strength of all-welded metal tensile sample shall not be less than the
specified minimum tensile strength value of the steel base metal;
b) The percentage elongation after fracture of all-welded metal tensile sample shall
not be less than the smaller value of the following two values:
1) 20%;
2) 104820
, where, U refers to the minimum tensile strength value specified by
welding steel base metal.
6.2 Bending test
6.2.1 Test requirement
The surface in tension of bending samples shall include the heat affected zone and
each kind of welding method (or welding process);
6.2.2 The form and processing of samples
a) When removing the weld reinforcement of sample, cold process shall be
adopted; the surface in tension of surface bending and root-bending samples
shall be flush; the surface in tension of samples shall be free from scratches
and damage;
b) Surface bending and root-bending samples are detailed in Figure 9 and Table
3.
1) The base metal category whose number is 1 in Table 3:
Where T >3mm, S=3mm; unnecessary thickness shall be removed from the
sample compression face;
Where T is less than or equal to 3mm, S shall be close to T as much as
possible;
2) The base metal category whose number is exclusive of 1 in Table 3:
Where T >10mm, S=10mm; unnecessary thickness shall be removed
from the sample compression face;
diameter equals
AS
)200( (A refers to the specified lower limiting value of
percentage elongation after fracture multiplied by 100); the spacing of supports
equal to the bend center diameter plus 2S+3mm;
e) When carrying out horizontal sample bending test, the weld metal and heat
affected zone shall be entirely located in the bending parts of the sample.
6.2.4 Qualified indexes
When the sample is bent to a specified angle, the welding seam and heat affected
zone on stretching plane along any direction shall be free from crack opening defect
with single length larger than 3mm, and the edge angle crack of sample shall
generally not be counted, but the edge angle crack length caused by incomplete
fusion, slag inclusion or other internal defects shall be counted.
If adopting two or more samples, each sample shall meet above requirements.
As for the composite metallic material produced by rolling method, exploded rolling
method and explosion method, where there are layering and crack caused by
non-combined defect of side bending sample composite interface, it is permissible to
sample again for testing.
6.3 Impact test
6.3.1 As for the weld zone and heat affected zone which adopt various welding
methods (or welding procedures), Charpy V test shall be carried out.
6.3.2 Sample:
a) Sampling orientation: the longitudinal axis shall be vertical to the weld axis,
and the Charpy V-notch axis shall be vertical to the base metal surface;
b) Sampling position: the sampling position on the coupon thickness is detailed in
Figure 11;
c) The notch position: the notch axis of the weld zone sample shall be located on
the weld center line.
For the distance from the notch axis of the heat affected zone sample to the
longitudinal axis and fusion line, the K is greater than zero and the crossing point shall
pass through the heat affected zone as much as possible, see Figure 12.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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