NB/T 47010-2017 English PDF (NB/T47010-2017)

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NB/T 47010-2017: Stainless and heat-resisting steel forgings for pressure equipment
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 
Stainless and heat-resisting steel forgings for
pressure equipment
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
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 10561 Steel - Determination of content of non-metallic inclusion -
Micrographic method using standard diagrams
GB/T 11170 Stainless steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (Routine method)
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13305 Micrographic method for determining area content of the α-
phases in stainless steels
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3:
Ultrasonic testing
NB/T 47013.5 Nondestructive testing of pressure equipment - Part 5:
Penetrant testing
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.
5.10.1 The shape, size, surface quality of the forging shall meet the
requirements of the order drawing.
5.10.2 The outer surface of the forging shall be free of harmful defects, such as
cracks, interlayers, folds, inclusions, etc., that are visible to the naked eye.
5.10.3 Defects, on the appearance of forgings, can be removed by machining
or grinding. The grinding part shall have a smooth transition. The grinding depth
shall meet the following requirements:
a) For non-machined surfaces, the grinding depth shall not exceed the lower
deviation of the nominal size, at this place;
b) For the machined surface, the grinding depth shall not exceed 75% of the
thickness allowance.
5.11 Welding repairs
5.11.1 Welding repairs for steel forgings are not allowed, without the consent of
the buyer.
5.11.2 With the consent of the purchaser, the welding repair of steel forgings
shall comply with the relevant regulations and standards. The position, depth,
area, welding consumables, welding process, welder qualification requirements,
non-destructive testing methods before and after welding repair, qualification
level, etc., shall be negotiated, between the supplier and the buyer.
5.11.3 The supplier shall provide the purchaser, with a schematic diagram of
the location, depth and area of the welding repair for forgings, welding materials,
welding process parameters, as well as non-destructive test reports.
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.
6.3 Hardness test
The hardness test is in accordance with GB/T 231.1.
6.4 Macroscopic inspection
The macroscopic inspection shall be in accordance with the provisions of GB/T
226.
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.
6.7 Visual inspection
The appearance inspection of forgings shall be visually inspected, under
sufficient lighting conditions.
7 Inspection rules
7.1 Inspection
The inspection of forgings is carried out by the supplier's inspection department.
7.2 Specimen requirements
7.2.1 The specimens, for chemical analysis, shall be prepared, in accordance
with the provisions of GB/T 20066.
7.2.2 The tensile specimen shall be the No. R4 specimen in GB/T 228.1. If
limited by the sampling size, according to the agreement between the supplier
and the buyer, it may also use the No. R7 specimen in GB/T 228.1.
7.2.3 The hardness test of level I forgings can be carried out, on the rough
surface of the forging blank AND at the sampling position, as shown in Figure
2. The hardness test specimens of other levels of forgings shall be prepared, in
accordance with the provisions of GB/T 231.1.
7.3 Sampling quantity