GB/T 30583-2014 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 30583-2014 | English | 485 |
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Specification for post weld heat treatment of pressure equipment
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GB/T 30583-2014: Specification for post weld heat treatment of pressure equipment---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/GBT30583-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.200
J 36
Specification for post weld heat treatment of pressure
equipment
Issued on. MAY 06, 2014
Implemented on. DECEMBER 01, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Basic process... 5
5 Equipment, instruments, temperature measuring supplies and thermal insulation
materials... 13
6 Technical preparation... 15
7 Heating, temperature control... 17
8 Temperature measurement... 18
9 Heat insulation... 20
10 Post weld heat treatment report... 21
Annex A (informative) Diagram of post weld heat treatment thickness (δPWHT)... 22
Annex B (informative) Recommended width of heated band and gradient control band
for partial post weld heat treatment of cylinders... 31
Annex C (normative) Determination method of effective heating area of post weld heat
treatment furnace... 32
Annex D (informative) Record table of overall post weld heat treatment outside the
furnace of pressure equipment (examples)... 35
1 Scope
This document specifies general basic technical requirements for post weld heat
treatment of steel pressure equipment.
This document applies to post weld heat treatment of boilers and pressure vessels
(excluding gas cylinders).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 3375, Welding terminology
GB/T 9452, Testing method for working zone of heat treatment furnace
NB/T 47014, Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 3375,
GB/T 9452 as well as the followings apply.
3.1 weldment
Welded pressure equipment or parts thereof.
3.2 post weld heat treatment
The process that, to eliminate the welding residual stress and improve the structure and
performance of the welded joint, the weldment is uniformly heated to a sufficiently high
temperature below the phase transition point of the metal, kept for a certain period of
time, and then uniformly cooled.
3.3 soak band
During partial post weld heat treatment, the area that the volume range over which the
weldment reaches the specified temperature is on its surface. The soak band includes
the weld zone, fusion zone, heat-affected zone and its adjacent base metal.
3.5 gradient control band
The area that during partial post weld heat treatment, to prevent heat dissipation in the
temperature range and heating range of the weldment, a thermal insulation material is
laid on its surface.
3.7 holding time
The time during which the indicated volume range of the weldment or its local soak
band is maintained at the holding temperature. The holding time is calculated from the
time when the temperature of all temperature measuring points reaches the minimum
holding temperature.
4 Basic process
4.1 General provisions
4.1.1 In addition to complying with this Standard, the post weld heat treatment of
pressure equipment shall also comply with the requirements of product standards,
design documents and contracts.
4.1.4 The constructer of pressure equipment shall have technical personnel, who have
certain professional knowledge and sufficient practical experience, after they master
the following basic conditions, prepare "Process specifications for post weld heat
treatment" for each (piece) weldment.
4.1.5 The welding process evaluation items used for weldments shall include all
important factors and supplementary factors that may occur during the implementation
of the "Process specifications for post weld heat treatment".
4.2 Post weld heat treatment thickness δPWHT
4.2.1 The δPWHT of equal thickness full penetration butt joint is the weld thickness
(excess height is not counted). At this time, δPWHT is the same as the base metal
thickness.
4.2.4 The values of δPWHT when welding pressure components with different
thicknesses are as follows (see Annex A).
4.2.5 Thickness of post weld heat treatment calculation holding time.
4.3 Post weld heat treatment methods
4.3.3 Partial post weld heat treatment
4.4 Specification parameters of post weld heat treatment
4.4.1 The specification parameters of post weld heat treatment are shown in Table 1.
4.4.1.1 For Fe-1 and Fe-3 steel weldments, when the post weld heat treatment is
performed below the minimum holding temperature in Table 1, the holding time can be
extended as specified in Table 2.The holding temperature of Fe-9B steel weldments
shall not exceed 635℃. When the post weld heat treatment is performed below the
minimum holding temperature in Table 1 (up to 55°C reduction is allowed), the holding
time can be extended according to the provisions of Table 2.
4.4.1.5 Limits of post weld heat treatment temperature for Fe-5B-2 steel weldments
under the following conditions.
4.4.2 The holding time of post weld heat treatment can be completed in one heat
treatment process. It can also be the accumulation of multiple heat treatment processes
at the same holding temperature.
4.4.3 Unless otherwise specified, the temperature of each temperature measurement
point is allowed to be within ±20°C of the specified temperature of the heat treatment
process but cannot exceed the specified limit.
5 Equipment, instruments, temperature measuring supplies
and thermal insulation materials
5.1 The post weld heat treatment furnace shall meet the following requirements.
5.2 The effective heating area of the post weld heat treatment furnace shall be
determined according to the provisions of Annex C. The schematic diagram of the
effective heating area shall be placed in a prominent position of the heat treatment
furnace
5.3 Insulation materials, temperature control instruments and temperature measuring
instruments shall meet corresponding standards. The product shall have quality
certificate and instruction manual.
5.4 Manufacturers of thermocouples and compensation wires shall have corresponding
qualifications. The used thermocouple and compensation wire shall have quality
certificate.
5.5 All kinds of measuring instruments shall pass the measurement inspection according
to the standard. Before use, calibrate as specified.
5.6 The post weld heat treatment heating, temperature control, temperature
measurement device and the whole system outside the furnace shall be inspected and
debugged each time before being put into use. Make them in a normal state and meet
the heat treatment requirements.
5.7 The thermal insulation material shall not contain elements and impurities that are
harmful to the weldment. It is advisable to use aluminum silicate fiber and its products,
high silica cloth, alkali-free glass fiber cloth.
6 Technical preparation
6.1 In the case of overall post weld heat treatment or partial post weld heat treatment in
the furnace, the main contents of the specification for the post weld heat treatment
process include.
6.2 For the specification for post weld heat treatment process of the overall post weld
heat treatment outside the furnace (including the overall post weld heat treatment
outside the furnace), an expert review shall be organized if necessary. The main contents
of the specification for post weld heat treatment process include.
6.3 Remove the non-permanent connections on weldments not related to post weld heat
treatment.
6.4 Effective measures shall be taken for finishing surfaces such as sealing surfaces and
screw holes of weldments, so as to prevent high temperature oxidation.
6.5 When performing post weld heat treatment outside the furnace, the heating
equipment shall have sufficient power reserve.
7 Heating, temperature control
7.1 Technical requirements
7.1.1 When performing post weld heat treatment in the furnace, according to the
technical requirements of the weldment, the corresponding type of heat treatment
furnace shall be selected in accordance with the provisions of GB/T 9452.Weldments
shall be placed within the effective heating area.
7.1.3 The heating medium shall avoid spraying the weldment directly.
7.1.4 The heating medium shall not cause oxidation, decarburization, carburization and
corrosion on the surface of the weldment that exceeds the depth specified in the
technical documents.
7.2 Regulations for post weld heat treatment furnaces and instruments
7.2.1 The detection period of the effective heating area of the post weld heat treatment
furnace is 6 months. For the heat treatment furnace of normal use that has passed the
inspection for 3 consecutive cycles, the detection period can be extended to 1 year.
7.2.4 The temperature measurement system of the post weld heat treatment device shall
be regularly calibrated under normal use. During calibration, the distance between the
hot ends of the detection thermocouple, temperature measurement thermocouple and
temperature control thermocouple shall be close.
8 Temperature measurement
8.1 Temperature measuring points and their arrangement
Figure 2 -- Thermocouple arrangement spacing diagram
8.1.4 Additional thermocouples can be added for temperature measurement points in
important parts.
8.1.5 The number of temperature measurement points and their arrangement shall be
indicated in the design drawing or schematic diagram of the weldment.
8.2 Welding requirements for capacitor energy storage points
Use welding methods (such as capacitor energy storage spot welding) to connect
thermocouples to weldments. The welding requirements for capacitor energy storage
points are as follows.
8.3 Temperature measurement
8.3.1 During the post weld heat treatment and heat holding period, the temperature of
any point on the weldment of the overall post weld heat treatment and the temperature
of any point within the volume range shown in the soak band of the weldment of the
partial post weld heat treatment shall be within the specified range.
8.3.2 The post weld heat treatment temperature is subject to direct measurement on the
weldment.
9 Heat insulation
9.1 The thermal insulation material shall be able to maintain the original performance
at the post weld heat treatment temperature and holding time without reducing the
thermal insulation effect.
9.2 The thermal insulation material shall be close to the surface of the weldment during
the entire post weld heat treatment process. Prevent loosening and falling off. When the
thermal insulation material is laid on the weldment, it shall be divided into at least two
layers. The seams between each two layers shall be staggered.
9.4 The temperature of the outer surface of the thermal insulation layer shall not be
higher than 60℃.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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