NB/T 47010-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| NB/T 47010-2017 | English | 245 |
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Stainless and heat-resisting steel forgings for pressure equipment
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| NB/T 47010-2010 | English | 95 |
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Stainless and heat-resisting steel forgings for pressure equipment
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NB/T 47010-2017: Stainless and heat-resisting steel forgings for 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/NBT47010-2017
NB
ENERGY INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.85
J 32
Replacing NB/T 47010-2010, JB/T 9626-1999
Stainless and heat-resisting steel forgings for
pressure equipment
Issued on. MARCH 28, 2017
Implemented on. AUGUST 01, 2017
Issued by. National Energy Administration
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Order content... 8
5 Technical requirements... 9
6 Test method... 16
7 Inspection rules... 17
8 Markings and quality certificates... 20
Appendix A (Informative) Forgings for boiler's matching valves AND special
components... 21
Appendix B (Normative) Additional requirements... 22
Appendix C (Informative) High temperature mechanical properties... 24
1 Scope
This standard specifies the terms and definitions, order content, technical
requirements, test methods, inspection rules, markings and quality certificates,
of stainless steel and heat-resisting steel forgings for pressure equipment.
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 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Steel, iron and alloy - Chemical analysis method (applicable part)
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at
room temperature
GB/T 228.2 Metallic materials - Tensile testing - Part 2.Method of test at
elevated temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
3 Terms and definitions
3.1
Hollow forging
Axisymmetric hollow forgings, which have an axial length L greater than its
outer diameter D, as shown in Figure 1a). t is the nominal thickness.
3.2
Ring forging
Axisymmetric hollow forgings, which have an axial length L less than or equal
to its outer diameter D, as shown in Figure 1 b). The smaller of L and t is the
nominal thickness.
3.3
Disk forging
Axisymmetric solid forgings, which have an axial length L less than or equal
to its outer diameter D, as shown in Figure 1c). L is the nominal thickness.
3.4
Bowl forging
Axisymmetric forgings, which have a concave cross-section AND an axial
length H less than or equal to its outer diameter D, as shown in Figure 1 d).
The larger of t1 and t2 is the nominal thickness.
4 Order content
The order contract, which adopts this standard, shall include the following
contents.
5 Technical requirements
5.1 Smelting method
The steel, which is used for forgings, shall be killed steel, which is smelted in
an electric furnace or oxygen converter AND refined outside the furnace. After
negotiation between the supplier and the buyer, it may use the smelting
methods, such as electroslag remelting.
5.2 Chemical composition
5.2.1 The designation and chemical composition (melting analysis) of the steel,
which is used for forgings, shall meet the requirements of Table 1.
5.4 Forging level
5.4.1 Forgings are divided into four levels. I, II, III, IV. The inspection items and
inspection quantities of each level shall meet the requirements of Table 2.
5.5 Delivery status
5.5.1 Forgings shall be delivered, in accordance with the heat treatment
conditions, which are specified in Table 3.The codes of the heat treatment state
are. A - Annealing, S - Solid solution, Ag - Aging, T - Tempering.
5.5.2 When the supplier changes the heat treatment state, it shall obtain the
consent of the buyer.
5.6 Mechanical properties
5.6.1 The mechanical properties of the finished forgings shall meet the
requirements of Table 3.For the mechanical properties of other supporting
valves and special component forgings, please refer to Appendix A.
5.6.2 The three measured values of the hardness test shall not exceed the
range, which is specified in Table 3.
5.8 Metallographic inspection
5.8.1 The grain size, non-metallic inclusions, microstructure of level III and level
IV forgings, for boiler pressure components, shall meet the requirements of
Appendix B.5.
5.8.2 The ferrite or austenite content of duplex steel forgings shall be within the
range of 40% ~ 60%.
5.9 Non-destructive testing
5.9.1 The internal defects of the forgings shall be inspected ultrasonically; level
I is qualified.
5.9.2 According to the requirements of the buyer, as negotiated between the
supplier and the buyer, AND indicated in the contract, it may add other non-
destructive testing (for example, non-destructive testing such as penetration).
5.11 Welding repairs
5.11.1 Welding repairs for steel forgings are not allowed, without the consent of
the buyer.
5.12 Additional requirements
According to the requirements of the buyer, as negotiated between the supplier
and the buyer, AND indicated in the contract, it may add other inspection items
in Appendix B.
6 Test method
6.1 Chemical analysis
Chemical analysis is in accordance with GB/T 223 or GB/T 11170, GB/T 20123,
GB/T 20124.The arbitration test is in accordance with GB/T 223.
6.2 Tensile test
The room temperature tensile test is in accordance with the provisions of GB/T
228.1.The high temperature tensile test is in accordance with the provisions of
GB/T 228.2.
6.5 Metallographic inspection
The grain size inspection is in accordance with the provisions of GB/T 6394.
The inspection of non-metallic inclusions shall be graded in accordance with
the method A in GB/T 10561.The microstructure inspection shall be in
accordance with the provisions of GB/T 13298.For the phase ratio inspection
of duplex steel, it may use GB/T 13305 to determine the ferrite content.
6.6 Ultrasonic testing
Ultrasonic testing is in accordance with NB/T 47013.3.
7 Inspection rules
7.1 Inspection
The inspection of forgings is carried out by the supplier's inspection department.
7.2 Specimen requirements
7.3 Sampling quantity
7.3.1 Chemical analysis
For chemical analysis, one specimen shall be taken for each furnace number.
7.3.2 Tension and impact
7.3.3 Macroscopic inspection
For macroscopic inspection, it shall take 1 specimen from each batch.
7.3.4 Metallographic inspection
For metallographic inspection, it shall take 1 specimen from each batch.
7.4 Sampling direction
For forgings (excluding bar forgings), it should take tangential specimens.
When tangential specimens cannot be obtained, take longitudinal or radial
specimens. For bar forgings, it should take longitudinal specimens.
7.5 Sampling location
7.6 Reinspection
7.6.1 When the buyer needs a re-inspection, the supplier shall provide the
purchaser's re-inspection samples; the validity period of the re-inspection shall
be negotiated by both parties.
7.6.2 When the tensile test is unqualified, it shall take double quantity of tensile
test specimens, from the vicinity of the original sampling location of the
inspected forging, for re-inspection. All data of the re-inspection result shall
meet the requirements of Table 3.
8 Markings and quality certificates
8.1 The marking shall be printed on the obvious part of the forging OR the place
designated by the purchaser. The position and method, of printing the mark,
shall not affect the final use of the forging. For small forgings, a mark can be
affixed on the packing box.
8.2 Forgings, which are inspected and delivered, according to this standard,
shall have the following marks.
8.3 When the forgings are delivered, they shall be accompanied by a quality
certificate, which includes.
NB/T 47010-2017
NB
ENERGY INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.85
J 32
Replacing NB/T 47010-2010, JB/T 9626-1999
Stainless and heat-resisting steel forgings for
pressure equipment
Issued on. MARCH 28, 2017
Implemented on. AUGUST 01, 2017
Issued by. National Energy Administration
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Order content... 8
5 Technical requirements... 9
6 Test method... 16
7 Inspection rules... 17
8 Markings and quality certificates... 20
Appendix A (Informative) Forgings for boiler's matching valves AND special
components... 21
Appendix B (Normative) Additional requirements... 22
Appendix C (Informative) High temperature mechanical properties... 24
1 Scope
This standard specifies the terms and definitions, order content, technical
requirements, test methods, inspection rules, markings and quality certificates,
of stainless steel and heat-resisting steel forgings for pressure equipment.
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 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Steel, iron and alloy - Chemical analysis method (applicable part)
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at
room temperature
GB/T 228.2 Metallic materials - Tensile testing - Part 2.Method of test at
elevated temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
3 Terms and definitions
3.1
Hollow forging
Axisymmetric hollow forgings, which have an axial length L greater than its
outer diameter D, as shown in Figure 1a). t is the nominal thickness.
3.2
Ring forging
Axisymmetric hollow forgings, which have an axial length L less than or equal
to its outer diameter D, as shown in Figure 1 b). The smaller of L and t is the
nominal thickness.
3.3
Disk forging
Axisymmetric solid forgings, which have an axial length L less than or equal
to its outer diameter D, as shown in Figure 1c). L is the nominal thickness.
3.4
Bowl forging
Axisymmetric forgings, which have a concave cross-section AND an axial
length H less than or equal to its outer diameter D, as shown in Figure 1 d).
The larger of t1 and t2 is the nominal thickness.
4 Order content
The order contract, which adopts this standard, shall include the following
contents.
5 Technical requirements
5.1 Smelting method
The steel, which is used for forgings, shall be killed steel, which is smelted in
an electric furnace or oxygen converter AND refined outside the furnace. After
negotiation between the supplier and the buyer, it may use the smelting
methods, such as electroslag remelting.
5.2 Chemical composition
5.2.1 The designation and chemical composition (melting analysis) of the steel,
which is used for forgings, shall meet the requirements of Table 1.
5.4 Forging level
5.4.1 Forgings are divided into four levels. I, II, III, IV. The inspection items and
inspection quantities of each level shall meet the requirements of Table 2.
5.5 Delivery status
5.5.1 Forgings shall be delivered, in accordance with the heat treatment
conditions, which are specified in Table 3.The codes of the heat treatment state
are. A - Annealing, S - Solid solution, Ag - Aging, T - Tempering.
5.5.2 When the supplier changes the heat treatment state, it shall obtain the
consent of the buyer.
5.6 Mechanical properties
5.6.1 The mechanical properties of the finished forgings shall meet the
requirements of Table 3.For the mechanical properties of other supporting
valves and special component forgings, please refer to Appendix A.
5.6.2 The three measured values of the hardness test shall not exceed the
range, which is specified in Table 3.
5.8 Metallographic inspection
5.8.1 The grain size, non-metallic inclusions, microstructure of level III and level
IV forgings, for boiler pressure components, shall meet the requirements of
Appendix B.5.
5.8.2 The ferrite or austenite content of duplex steel forgings shall be within the
range of 40% ~ 60%.
5.9 Non-destructive testing
5.9.1 The internal defects of the forgings shall be inspected ultrasonically; level
I is qualified.
5.9.2 According to the requirements of the buyer, as negotiated between the
supplier and the buyer, AND indicated in the contract, it may add other non-
destructive testing (for example, non-destructive testing such as penetration).
5.11 Welding repairs
5.11.1 Welding repairs for steel forgings are not allowed, without the consent of
the buyer.
5.12 Additional requirements
According to the requirements of the buyer, as negotiated between the supplier
and the buyer, AND indicated in the contract, it may add other inspection items
in Appendix B.
6 Test method
6.1 Chemical analysis
Chemical analysis is in accordance with GB/T 223 or GB/T 11170, GB/T 20123,
GB/T 20124.The arbitration test is in accordance with GB/T 223.
6.2 Tensile test
The room temperature tensile test is in accordance with the provisions of GB/T
228.1.The high temperature tensile test is in accordance with the provisions of
GB/T 228.2.
6.5 Metallographic inspection
The grain size inspection is in accordance with the provisions of GB/T 6394.
The inspection of non-metallic inclusions shall be graded in accordance with
the method A in GB/T 10561.The microstructure inspection shall be in
accordance with the provisions of GB/T 13298.For the phase ratio inspection
of duplex steel, it may use GB/T 13305 to determine the ferrite content.
6.6 Ultrasonic testing
Ultrasonic testing is in accordance with NB/T 47013.3.
7 Inspection rules
7.1 Inspection
The inspection of forgings is carried out by the supplier's inspection department.
7.2 Specimen requirements
7.3 Sampling quantity
7.3.1 Chemical analysis
For chemical analysis, one specimen shall be taken for each furnace number.
7.3.2 Tension and impact
7.3.3 Macroscopic inspection
For macroscopic inspection, it shall take 1 specimen from each batch.
7.3.4 Metallographic inspection
For metallographic inspection, it shall take 1 specimen from each batch.
7.4 Sampling direction
For forgings (excluding bar forgings), it should take tangential specimens.
When tangential specimens cannot be obtained, take longitudinal or radial
specimens. For bar forgings, it should take longitudinal specimens.
7.5 Sampling location
7.6 Reinspection
7.6.1 When the buyer needs a re-inspection, the supplier shall provide the
purchaser's re-inspection samples; the validity period of the re-inspection shall
be negotiated by both parties.
7.6.2 When the tensile test is unqualified, it shall take double quantity of tensile
test specimens, from the vicinity of the original sampling location of the
inspected forging, for re-inspection. All data of the re-inspection result shall
meet the requirements of Table 3.
8 Markings and quality certificates
8.1 The marking shall be printed on the obvious part of the forging OR the place
designated by the purchaser. The position and method, of printing the mark,
shall not affect the final use of the forging. For small forgings, a mark can be
affixed on the packing box.
8.2 Forgings, which are inspected and delivered, according to this standard,
shall have the following marks.
8.3 When the forgings are delivered, they shall be accompanied by a quality
certificate, which includes.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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