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NB/T 47010-2017 English PDF (NBT47010-2017)

NB/T 47010-2017 English PDF (NBT47010-2017)

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NB/T 47010-2017: Stainless and heat-resisting steel forgings for pressure equipment

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.
NB/T 47010-2017
NB
ENERGY INDUSTRY STANDARD OF THE
PEOPLE 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 ??-
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
7.3.1 Chemical analysis
For chemical analysis, one specimen shall be taken for each furnace number. 7.3.2 Tension and impact
7.3.2.1 For forgings, which have a single heat treatment mass less than or equal to 3500 kg, it shall take 1 set specimens (1 tension at room temperature). 7.3.2.2 For forgings, which have a single heat treatment mass more than 3500 kg, it shall take 2 sets of specimens (1 tension at room temperature for each). The positions of the two sets of specimens are 180?? apart. If the length of the forging is greater than 1.5 times the diameter, it shall take one set of specimens, each at both ends of the forging, at an interval of 180??.
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
7.5.1 For hollow forgings and ring forgings, it shall take specimens from the end of the forgings, at 1/2 of the wall thickness, as shown in Figure 2 a) and Figure 2 b).
7.5.2 For disk forgings, it shall take specimen from the end of the forging. When the diameter of the disk forging is less than or equal to 350 mm, it shall take specimens from the outer edge. When the diameter is greater than 350 mm, it shall take specimens inwards, at the position more than or equal to 20 mm from the edge, as shown in Figure 2 c).
7.5.3 For the bowl forging, it shall take specimen from the open end of the forging, at the 1/2 position of the wall thickness, as shown in Figure 2 d). 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.
7.6.3 When the mechanical performance test or re-inspection is unqualified, the batch (piece) of forgings is allowed to be inspected, after re-heat treatment. However, the number of re-heat treatment shall not exceed 2.
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:
a) The name (or code) of the forging manufacturer;
b) Standard number;
c) Material designation;
d) Forging level;
e) Batch number.
8.3 When the forgings are delivered, they shall be accompanied by a quality certificate, which includes:
a) Forging manufacturer;
b) Order contract number;
c) Standard number, material designation, forging level, batch number,
quantity of forgings;
d) Various inspection results, signatures and seals of inspection units and inspectors;
e) Heat treatment curve (copy);
f) The inspection results of the special requirements, which are specified in the contract.
Appendix B
(Normative)
Additional requirements
This requirement is implemented, only when the buyer stipulates in the order contract. It may use one or more of them. The details of the additional requirements shall be negotiated by the supplier and the buyer.
B.1 Simulated post-weld heat treatment of specimen blank for mechanical properties
Before the mechanical property test, all specimen blanks shall be heat treated one or more times, below the critical temperature, which is mainly based on the expectation that, forging products will subject to post-weld heat treatment or other heat treatments, during the container manufacturing process. The buyer shall provide the supplier, with detailed heat treatment specifications, including temperature, holding time, cooling rate.
B.2 Use thermal buffer ring or ring segment for heat treatment
Before the heat treatment of the forging, weld the edge of a thermal buffer ring, which has a section of at least t x t (t is the nominal thickness of the forging) OR a ring segment, which has a section of at least t x t and an arc length of at least 3t, on the sampling end of the forging. The thermal buffer ring or ring segment is made of carbon steel or low alloy steel, which has good weldability. After the forging is heat treated, cut off the thermal buffer ring or ring segment. The specimen is taken from the area of the forging, that is thermally buffered by the thermal buffer ring or ring segment. When a thermal buffer ring segment is used, the specimen shall be taken, from the forging part corresponding to the middle 1/3 of the arc length, of the thermal buffer ring segment. The position of the specimen shall be at least 13 mm, away from the thermal buffer surface of the forging, AND at least t/4 from the heat-treated surface of the forging. B.3 Corrosion test
The corrosion test requirements for forgings shall be negotiated between the supplier and the buyer.
B.4 Penetration testing
Penetration testing method can be in accordance with the provisions of NB/T 47013.5. The level I is qualified.
B.5 Metallographic inspection

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