NB/T 47008-2017 PDF English
US$125.00 · In stock · Download in 9 secondsNB/T 47008-2017: Carbon and alloy steel forgings for pressure equipment Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid NB/T 47008: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| NB/T 47008-2017 | English | 125 |
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Carbon and alloy steel forgings for pressure equipment
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| NB/T 47008-2010 | English | 115 |
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Carbon and alloy steel forgings for pressure equipment
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NB/T 47008-2017: Carbon and alloy 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/NBT47008-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.85
J 32
Replacing NB/T 47008-2010, JB/T 9626-1999
Carbon and alloy 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 methods... 17
7 Inspection rules... 18
8 Markings and quality certificates... 21
Annex A (informative) Forgings for supporting valves and special components
of boilers... 22
Annex B (normative) Additional requirements... 24
Annex C (informative) High temperature mechanical properties... 26
1 Scope
This Standard specifies terms and definitions, order content, technical requirements,
test methods, inspection rules and markings and quality certificates of carbon and alloy
steel forgings for pressure equipment.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated edition cited applies. For undated
references, the latest edition of the referenced document (including all amendments)
applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy (applicable parts)
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (routine method)
3 Terms and definitions
3.1
hollow forging
Axisymmetric hollow forging with an axial length L greater than its outer diameter D,
as shown in Figure 1 a). t is the nominal thickness.
3.2
ring forging
Axisymmetric hollow forging with an axial length L less than or equal to its outer
diameter D, as shown in Figure 1 b). The smaller one of L and t is the nominal thickness.
3.3
disk forging
Axisymmetric solid forging with an axial length L less than or equal to its outer diameter
D, as shown in Figure 1 c). L is the nominal thickness.
3.4
bowl forging
Axisymmetric forging with 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 one of t1 and t2 is the
nominal thickness.
4 Order content
The order contract using this Standard shall include the following.
5 Technical requirements
5.1 Smelting method
Forging steel shall be killed steel smelted using electric furnace or oxygen converter
and subjected to secondary refining. Agreed upon between the supply and demand
parties, electroslag remelting and other smelting methods can be used.
5.2 Chemical composition
5.2.1 Smelting analysis
5.2.2 Finished product analysis
5.2.2.1 The demand party may carry out the finished product analysis, and the analysis
result and the allowable deviation of the specified value in Table 1 shall comply with
the provisions of GB/T 222.
5.3 Forging
5.3.1 Steel ingots, steel billets or rolling materials for forging shall have a quality
certificate of the smelting organization.
5.4 Forging grade
5.4.1 Forgings are divided into 4 grades, i.e. I, II, III and IV. The inspection items and
inspection quantity of each grade shall comply with the provisions of Table 2.
5.6 Mechanical properties
5.6.1 The mechanical properties of finished forgings shall comply with the provisions
of Table 3.The mechanical properties of other forgings for supporting valves and
special components are shown in Annex A.
5.6.2 The three measured values of hardness test shall not exceed the limits specified
in Table 3.
5.12 Repair by welding
5.12.1 Steel forgings are not allowed to be repaired by welding without the consent of
the demand party.
5.12.2 As agreed by the demand party, the repair by welding of steel forgings shall
comply with the provisions of relevant regulations and standards. The position, depth,
area of repair by welding, welding material, welding technology, welder qualification
requirements, nondestructive testing methods and qualification grades before and
after repair by welding shall be agreed upon between the supply and demand parties.
6 Test methods
6.1 Chemical analysis
The chemical analysis shall comply with the provisions of GB/T 223, GB/T 4336, GB/T
20123, GB/T 20124.The arbitration test shall comply with the provisions of GB/T 223.
6.2 Tensile test
The room temperature tensile test shall comply with the provisions of GB/T 228.1, and
the high temperature tensile test shall comply with the provisions of GB/T 228.2.
6.7 Ultrasonic testing
The ultrasonic testing shall comply with the provisions of NB/T 47013.3.
6.8 Appearance inspection
The appearance inspection of forgings shall be visual inspection under full lighting
conditions.
7 Inspection rules
7.1 Inspection
The inspection of forgings is carried out by the supply party’s inspection department.
7.2 Sample requirements
7.3 Sampling quantity
7.3.1 Chemical analysis
TAKE 1 sample form each smelting furnace for chemical analysis.
7.3.2 Tensile and impact
7.3.2.1 For heat treated forgings with a mass less than or equal to 3 500 kg, take 1 set
of samples (1 for room temperature tensile, 3 for impact).
7.3.2.2 For heat treated forgings with a mass greater than 3 500 kg, take 2 sets of
samples (in each set, 1 for room temperature tensile, 3 for impact), and 2 sets of
samples are at an interval of 180 °. If the length of the forging is greater than 1.5 times
the diameter, each take a set of samples at two ends of the forging and at an interval
of 180 °.
7.5.3 Samples of bowl forgings shall be taken at 1/2 of the wall thickness at the open
ends of the forgings, see Figure 2 d).
7.5.4 Samples of neck flange forgings shall be taken at the nominal thickness at a
distance greater than or equal to 20 mm from the outer edge of the forgings (or from
the inner surface), see Figure 2 e).
7.5.5 Samples for bar forgings shall be taken from the ends of the forgings and at 1/4
of the nominal thickness.
7.5.6 In addition to Grade IV forgings, samples for mechanical properties of forgings
can also be prepared from the separately-forged inspection ingots from the same batch.
The inspection ingots shall have the same forging technology with forgings, with the
thickness greater than or equal to the nominal thickness of forgings, and are heat
treated in the same furnace.
7.6.3 When the impact test results are unqualified, take 3 impact test samples from
where near the original sampling part of the inspected forging for re-inspection. The
qualification condition is that the arithmetic mean of the test data of 2 sets of samples,
i.e. 6 samples, shall not be less than the provisions of Table 3, allowing two test data
to be less than the specified value, of which only one is allowed to be less than 70 %
of the specified value.
8 Markings and quality certificates
8.1 The marking shall be printed on the obvious part on forgings or the part specified
by the demand party, and the location and manner of the marking shall not affect the
use of forgings. For small forgings, the label may be stuck on the packaging box.
8.2 Forgings qualified and delivered according to this Standard shall have the following
markings.
NB/T 47008-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.85
J 32
Replacing NB/T 47008-2010, JB/T 9626-1999
Carbon and alloy 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 methods... 17
7 Inspection rules... 18
8 Markings and quality certificates... 21
Annex A (informative) Forgings for supporting valves and special components
of boilers... 22
Annex B (normative) Additional requirements... 24
Annex C (informative) High temperature mechanical properties... 26
1 Scope
This Standard specifies terms and definitions, order content, technical requirements,
test methods, inspection rules and markings and quality certificates of carbon and alloy
steel forgings for pressure equipment.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated edition cited applies. For undated
references, the latest edition of the referenced document (including all amendments)
applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy (applicable parts)
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (routine method)
3 Terms and definitions
3.1
hollow forging
Axisymmetric hollow forging with an axial length L greater than its outer diameter D,
as shown in Figure 1 a). t is the nominal thickness.
3.2
ring forging
Axisymmetric hollow forging with an axial length L less than or equal to its outer
diameter D, as shown in Figure 1 b). The smaller one of L and t is the nominal thickness.
3.3
disk forging
Axisymmetric solid forging with an axial length L less than or equal to its outer diameter
D, as shown in Figure 1 c). L is the nominal thickness.
3.4
bowl forging
Axisymmetric forging with 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 one of t1 and t2 is the
nominal thickness.
4 Order content
The order contract using this Standard shall include the following.
5 Technical requirements
5.1 Smelting method
Forging steel shall be killed steel smelted using electric furnace or oxygen converter
and subjected to secondary refining. Agreed upon between the supply and demand
parties, electroslag remelting and other smelting methods can be used.
5.2 Chemical composition
5.2.1 Smelting analysis
5.2.2 Finished product analysis
5.2.2.1 The demand party may carry out the finished product analysis, and the analysis
result and the allowable deviation of the specified value in Table 1 shall comply with
the provisions of GB/T 222.
5.3 Forging
5.3.1 Steel ingots, steel billets or rolling materials for forging shall have a quality
certificate of the smelting organization.
5.4 Forging grade
5.4.1 Forgings are divided into 4 grades, i.e. I, II, III and IV. The inspection items and
inspection quantity of each grade shall comply with the provisions of Table 2.
5.6 Mechanical properties
5.6.1 The mechanical properties of finished forgings shall comply with the provisions
of Table 3.The mechanical properties of other forgings for supporting valves and
special components are shown in Annex A.
5.6.2 The three measured values of hardness test shall not exceed the limits specified
in Table 3.
5.12 Repair by welding
5.12.1 Steel forgings are not allowed to be repaired by welding without the consent of
the demand party.
5.12.2 As agreed by the demand party, the repair by welding of steel forgings shall
comply with the provisions of relevant regulations and standards. The position, depth,
area of repair by welding, welding material, welding technology, welder qualification
requirements, nondestructive testing methods and qualification grades before and
after repair by welding shall be agreed upon between the supply and demand parties.
6 Test methods
6.1 Chemical analysis
The chemical analysis shall comply with the provisions of GB/T 223, GB/T 4336, GB/T
20123, GB/T 20124.The arbitration test shall comply with the provisions of GB/T 223.
6.2 Tensile test
The room temperature tensile test shall comply with the provisions of GB/T 228.1, and
the high temperature tensile test shall comply with the provisions of GB/T 228.2.
6.7 Ultrasonic testing
The ultrasonic testing shall comply with the provisions of NB/T 47013.3.
6.8 Appearance inspection
The appearance inspection of forgings shall be visual inspection under full lighting
conditions.
7 Inspection rules
7.1 Inspection
The inspection of forgings is carried out by the supply party’s inspection department.
7.2 Sample requirements
7.3 Sampling quantity
7.3.1 Chemical analysis
TAKE 1 sample form each smelting furnace for chemical analysis.
7.3.2 Tensile and impact
7.3.2.1 For heat treated forgings with a mass less than or equal to 3 500 kg, take 1 set
of samples (1 for room temperature tensile, 3 for impact).
7.3.2.2 For heat treated forgings with a mass greater than 3 500 kg, take 2 sets of
samples (in each set, 1 for room temperature tensile, 3 for impact), and 2 sets of
samples are at an interval of 180 °. If the length of the forging is greater than 1.5 times
the diameter, each take a set of samples at two ends of the forging and at an interval
of 180 °.
7.5.3 Samples of bowl forgings shall be taken at 1/2 of the wall thickness at the open
ends of the forgings, see Figure 2 d).
7.5.4 Samples of neck flange forgings shall be taken at the nominal thickness at a
distance greater than or equal to 20 mm from the outer edge of the forgings (or from
the inner surface), see Figure 2 e).
7.5.5 Samples for bar forgings shall be taken from the ends of the forgings and at 1/4
of the nominal thickness.
7.5.6 In addition to Grade IV forgings, samples for mechanical properties of forgings
can also be prepared from the separately-forged inspection ingots from the same batch.
The inspection ingots shall have the same forging technology with forgings, with the
thickness greater than or equal to the nominal thickness of forgings, and are heat
treated in the same furnace.
7.6.3 When the impact test results are unqualified, take 3 impact test samples from
where near the original sampling part of the inspected forging for re-inspection. The
qualification condition is that the arithmetic mean of the test data of 2 sets of samples,
i.e. 6 samples, shall not be less than the provisions of Table 3, allowing two test data
to be less than the specified value, of which only one is allowed to be less than 70 %
of the specified value.
8 Markings and quality certificates
8.1 The marking shall be printed on the obvious part on forgings or the part specified
by the demand party, and the location and manner of the marking shall not affect the
use of forgings. For small forgings, the label may be stuck on the packaging box.
8.2 Forgings qualified and delivered according to this Standard shall have the following
markings.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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