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GB/T 16508.2-2013 (GB/T16508.2-2013)

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GB/T 16508.2-2013: PDF in English (GBT 16508.2-2013)
GB/T 16508.2-2013
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
J 98
Partially replacing GB/T 16507-1996
Shell Boilers -- Part 2: Material
ISSUED ON: DECEMBER 31, 2013
IMPLEMENTED ON: JULY 1, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 General Requirements ... 7
4 Steel Plate ... 9
5 Steel Tube ... 11
6 Steel Forging ... 13
7 Steel Casting ... 16
8 Iron Casting ... 18
9 Suspender and Tension Brace ... 19
10 Fastener ... 20
11 Welding Material ... 20
Appendix A (Informative) Metallographic Inspection for Steel forging ... 21
Appendix B (Informative) High-temperature Property of the Common Material
... 23
Shell Boilers -- Part 2: Material
1 Scope
This Part of GB/T 16508 specifies material designation and its standard, basic
technical requirements (including steel plate, steel tube, steel forging, steel casting,
iron casting, suspender and tension brace, fastener, welding material), application
scope (temperature and pressure), and permissible stress allowed to be used for
pressure part of shell boiler, as well as material designation and its standard allowed
to be used for non-pressure part of shell boiler.
This Part is applicable for selection and application of materials for pressure parts and
non-pressure parts of the shell boiler as defined in GB/T 16508.1.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated reference, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB 150.2 Pressure Vessels - Part 2: Materials
GB/T 699 Quality Carbon Structural Steels
GB/T 700 Carbon Structural Steels
GB/T 711 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide
Strips
GB 713 Steel Plates for Boilers and Pressure Vessels
GB/T 1220 Stainless Steel Bars
GB/T 1221 Heat-resistant Steel Bars
GB/T 1348 Spheroidal Graphite Iron Castings
GB/T 3077 Alloy Structure Steels
GB 3087 Seamless Steel Tubes for Low and Medium Pressure Boiler
GB/T 3274 Hot-rolled Plates and Strips of Carbon Structural Steels and High
Strength Low Alloy Structural Steels
GB/T 4338 Metallic Materials - Tensile Testing at Elevated Temperature
GB 5310 Seamless Steel Tubes and Pipes for High Pressure Boiler
GB/T 6394 Metal - Methods for Estimating the Average Grain Size
GB/T 6803 Test method for Drop-weight Test to Determine Nil-ductility
Transition Temperature of Ferritic Steels
GB/T 8163 Seamless Steel Tubes for Liquid Service
GB/T 9439 Grey Iron Castings
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions-
Micrographic Method Using Standards Diagrams
GB/T 11352 Carbon Steel Castings for General Engineering Purpose
GB/T 13298 Metal - Inspection Method of Microstructure
GB/T 16507.2 Water-tube Boilers - Part 2: Materials
GB/T 16508.1 Shell Boilers - Part 1: General Requirements
JB/T 2637 Specification for Pressure-containing Nodular Iron Castings of
Boiler
JB/T 2639 Pressure Grey Iron Castings of Boiler - Specification
JB/T 4730.3 Nondestructive Testing of Pressure Equipment - Part 3: Ultrasonic
Testing
JB/T 9625 Specification for Pressure Retaining Casting of Boiler Pipe Fittings
JB/T 9626 Specification for Boiler Forging
NB/T 47008 Carbon and Low-alloy Steel Forgings for Pressure Equipment
NB/T 47018 Technical Permission of Welding Materials for Pressure Equipment
3.3 Quality certificate
Steel for pressure part shall be accompanied with material quality certificate of material
fabrication organization. The material quality certificate shall meet the following
requirements:
a) The material fabrication organization shall provide the user with the original
quality certificate as specified in the material standard and the order contract;
and shall provide distinct and firm steel stamp or other marking on the obvious
part of material. The material quality certificate shall be complete and distinct
in contents and shall be stamped with the quality inspection seal of the material
fabrication organization;
b) Where the boiler material is not directly supplied by the material fabrication
organization, the supplier shall provide the original material quality certificate or
the copies with its official seal and signature of its operator.
3.4 Material acceptance
The boiler fabrication organization shall carry out acceptance according to material
quality certificate, and the material may only be used after being regarded as
acceptable. Foreign designation material shall be accepted according to the technical
standards and technical conditions specified in order contract, where necessary,
compared with the boiler material standard in China, the lacking inspection item shall
be redone, and it may only be used after being regarded as acceptable.
Physicochemical and corresponding non-destructive testing and re-inspection may be
omitted for the material under any of the following conditions:
a) The acceptance personnel of the material using organization carries out
acceptance at the material fabrication organization according to the
procurement technical requirements and make a witnessed signature on the
inspection report for confirmation;
b) The carbon steel plate, tube and welding material for boiler under pressure
below 3.8MPa shall be provided with distinct and complete physical mark and
material quality certificate in accordance with the specified requirements. In
addition, the quality certificate shall conform to the physical object.
3.5 Basic requirements
3.5.1 Steel for pressure part and steel for non-pressure part welded to pressure part
shall be killed steel.
3.5.2 For the steel plate, steel tube, steel forging and round steel for suspender etc.
for pressure part, where they are directly made by rolling and forging with steel billet
casting (including ingot casting and continuous casting billet), their compression ratio
shall not be less than 3.
3.5.3 After tensile test is carried out on standard specimen of steel (steel plate, steel
tube, steel forging and its welded joints etc.) for pressure part, the post-fracture
percentage elongation (A) of the steel shall not be less than 18%; impact absorbed
energy value KV2 obtained from V-shaped Charpy impact test shall not be lower than
27J.
3.5.4 Permissible stress of steel for pressure part is determined according to the
principle of GB/T 16508.1. Permissible stress value between two adjacent calculating
temperatures listed in permissible stress table may be determined through arithmetic
interpolation method, and its value is rounded off as an integer.
3.5.5 Under use conditions, welding material shall be provided with enough strength,
plasticity, toughness and favorable anti-fatigue property and corrosion resistance
property.
3.5.6 See Appendix B for non-proportional elongation strength value (Rp0.2) of steel
at high temperature, mean value of 105h endurance strength, elasticity modulus and
mean linear expansion coefficient, etc.
4 Steel Plate
4.1 Application Scope for common steel plate is in accordance with those specified
in Table 1.
4.2 Permissible stress of the steel plate material is in accordance with those specified
in Table 2.
4.3 Where heat treatment like normalizing and normalizing plus tempering are
needed to be carried out on steel plate material during boiler fabrication, steel plate
fabrication organization may deliver steel plate with its delivery state different from the
heat treatment specified in Table 2. Where the steel plate fabrication organization and
the boiler fabrication organization carry out delivery inspection and receiving
acceptance for mechanical property of steel plate respectively, rough specimen after
heat treatment is used for the test.
4.4 For 20 steel plate purchased according to GB/T 711, the lower yield strength
value (ReL) specified in its material quality certificate or after receiving re-inspection for
tensile test shall not be less than 245MPa.
suspension device (U-shaped clamp and pin roll etc.) are in accordance with those
specified in Table 7 and Table 8 respectively.
6.3 The rating for steel forging is determined by the design document and noted in
the drawing.
6.4 Where required by user, Grades III and IV steel forging of pressure part shall
additionally be subject to metallographic inspection by reference to the requirements
in Appendix A.
6.5 For steel forging with the design calculating temperature above 300°C, a high-
temperature tensile test at the design calculating temperature may be additionally
required in the design document and shall comply with GB/T 4338; see Appendix B for
the specified value of non-proportional elongation strength at high temperature Rp0.2.
6.6 Slip-on-welding steel tube flange with operating pressure not exceeding 2.5MPa
may be fabricated with the steel plate given in Table 1.
6.7 Parts such as tube fittings (tee junction, elbow and reducer union etc.) and header
head may be processed and fabricated by hot processing with corresponding materials
of steel tube given in Table 3.
6.8 Except for various flanges, hollow cylindrical tube fittings or tube cape fittings may
be processed by rolled or forged round steel with the corresponding materials
designation given in Table 5, with the round steel not allowed to be substituted by steel
plate. Where rolled or forged round steel is used for processing hollow cylindrical tube
fittings or tube cape fittings, the following requirements shall be complied with:
a) The outside diameter of carbon steel tube fittings shall not be larger than
160mm and that of alloy steel tube fittings or tube cap fittings shall not be larger
than 114mm;
b) The longitudinal axis of tube fittings shall be in line with the axis of round steel;
c) The heat treatment state of processed fittings shall comply with the
requirements of drawing;
d) The processed fittings shall be subject to non-destructive testing according to
requirements of drawing.
tempering
8 Iron Casting
8.1 The application scope of iron casting shall be in accordance with those specified
in Table 12.
8.2 The safety coefficient for the tensile strength of grey iron casting at room
temperature is not less than 10.0, and that for spheroidal graphite iron casting at room
temperature is not less than 8.0. Permissible stress of common iron casting material
(with nominal thickness ≤30mm) is in accordance with those specified in Table 13.
8.3 Grey iron casting shall not be used to fabricate the blowdown valve and
blowdown bent tube.
8.4 For boiler with the rated operating pressure less than or equal to 1.6MPa and
superheater with the steam temperature less than or equal to 300°C, the spheroidal
graphite iron casting listed in Table 12 may be adopted for the fabrication of their blow-
off valve and blowdown valve.
8.5 For the square cast-iron economizer and elbow of the boiler with the rated
operating pressure less than or equal to 2.5MPa, grey iron casting with the designation
not less than HT 300 is allowed to be adopted; for the square cast-iron economizer
and elbow of the boiler with the rated operating pressure less than or equal to 1.6MPa,
the grey iron casting with the designation not less than HT 300 is allowed to be adopted.
8.6 Repair welding is forbidden to be carried out on the iron casting used for the
bearing part.
Table 12 -- Application Scope for Iron Casting
Material
category Material designation Material standard
Application scope
Nominal diameter
dimension
mm
Operating pressure
MPa
Medium
temperature
°C
Grey iron
casting HT300, HT350
GB/T 9439 ≤300 ≤0.8
< 230
JB/T 2639 ≤200 ≤1.6
Spheroidal
graphite iron
casting
QT400-18, QT450-10
GB/T 1348 ≤150 ≤1.6
< 300
JB/T 2637 ≤100 ≤2.5
Appendix A
(Informative)
Metallographic Inspection for Steel forging
A.1 General
A.1.1 This appendix is a supplement to the text of the standard, specifying the
requirements for metallographic inspection of steel forging for pressure part.
A.1.2 Steel forging for pressure part shall not only comply with this appendix, but also
meet the relevant requirements of this Standard.
A.2 Metallographic inspection
A.2.1 Additional metallographic inspection may be carried out on Grade III and IV
steel forging used for boiler pressure part.
A.2.2 The sampling position for metallographic inspection is the same as that for
mechanical property test.
A.2.3 Actual grain size
The actual grain size of steel forging shall be inspected as GB/T 6394 and shall be in
accordance with that specified in Table A.1.
Table A.1 -- Actual Grain Size of Steel Forging
Material designation Grain size rating
Two testing areas
Difference between the maximum rating and the
minimum rating of grain size
20
Grades 4~10 Shall not exceed Grade 3
16Mn
15CrMo, 14Cr1Mo
12Cr1MoV, 12Cr2Mo1
A.2.4 Nonmetallic inclusion
The nonmetallic inclusion of steel forging is rated according to Method A of GB/T 10561;
Classes A, B, C, D and DS inclusions (regardless of fine or rough) individually shall be
rated at 2.5 or less; the overall class of various fine and rough inclusions respectively
shall be 6.5 or less.
......
 
(Above excerpt was released on 2019-08-17, modified on 2022-02-20, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT16508.2-2013