NB/T 47009-2010 (NBT47009-2010)

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NB/T 47009-2010	English	90	Add to Cart	0--9 seconds. Auto-delivery	Low-alloy steel forgings for low temperature pressure equipment	NB/T 47009-2010	Obsolete	NB/T 47009-2010

Contents
Scope ... 1
Normative References
Terms and Definitions ...
Order Contents ...
... 1
... 2
... 3
5 Technical Requirements ... 4
6 Test Methods.
7 Inspection Rules
Appendix A (Normative) Additional Requirements
... 6
... 7
.. 10
Foreword
Compared with JB 4727-2000, this standard has the following main changes.
--Design pressure in application scope has been improved to less than lOOMPa from
not greater than 35MPa;
---100 'C grade low temperature steel 08Ni 3D was added;
--Sulfur content of each steel grade was reduced;
--The chromium and molybdenum contents of 08MnNiCrMo VD steel forging where
adjusted, and the steel grade is reduced to 08MnNiMo VD;
--As for 16MnD steel forging, tensile property index of nominal thickness less than or
equal to lOOmm is added, and the impact test temperature is reduced from -40'C to -45'C;
--Low temperature impact power index of all of the steel forgings were improved.
Appendix A of this standard is normative.
This standard was proposed by and under the jurisdiction of National Technical
Committee on Boilers and Pressure Vessels of Standardization Administration of China
(SAC/TC 262).
Drafting organizations. Hefei General Machinery Research Institute, China National
General Machinery Engineering Corporation, China Special Equipment Inspection and
Research Institute, Anhui Bureau of Quality and Technical Supervision, Wuxi Falan Forging
Co., Ltd., Nanjing Develop Industry Co., Ltd., Changzhou Sunshine General Petrochemical
Fittings Co. , Ltd., Jiangyin Fangyuan Ringlike Forging&Flange Co., Ltd.
Drafting staffs. Zhang Xiaohu, Qin Xiaozhong, Zhang Yong, Yang Guoyi, Gu Xianshan,
Xu Jianping, Yan Mingxin, Li rongrong, Chen Zhiwei and Tang Junxian.
National Technical Committee on Boilers and Pressure Vessels of Standardization
Administration of China (SAC/TC 262) is in the charge of the explanation of this standard.
The previous editions replaced by this standard are as.
--JB 4727-1994;
--JB 4727-2000.
Low-Alloy Steel Forgings for Low Temperature Pressure Equipments
1 Scope
This standard specifies the technical requirements, test methods and inspection rules, etc.
for low-alloy steel forgings for low temperature pressure equipments.
This standard is applicable to low-alloy steel forgings for low temperature pressure
equipments with a design temperature lower than O'C and design pressure below lOOMpa.
2 Normative References
The following documents contain provlSlons which, through reference in this text,
constitute provisions of this standard. For dated references, only the dated versions apply to
this standard. For undated references, the latest edition of the normative document (include all
the amendments) is applicable to this standard.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 223
GB/T 228
(ISO 6892. 1998(E))
GB/T 229- 2007
148-1 .2006)
Methods for Chemical Analysis of Iron, Steel and Alloy
Metallic Materials - Tensile Testing at Ambient Temperature
Metallic Materials-Charpy Pendulum Impact Test Method (ISO
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission
Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 6394 Metal-methods for Estimating the Average Grain Size (ASTM
Ell2.1996)
GB/T 10561 Steel Determination of Content of Nonmetallic
Inclusions-Micrographic Method Using Standards Diagrams (ISO 4967. 1998)
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the
Determination of Chemical Composition (ISO 14284. 1996)
JB/T 4730.3 Nondestructive Testing of Pressure Equipments-Part 3.
Ultrasonic Testing
3 Terms and Definitions
This standard applies the following tenns and definitions.
3.1
Hollow forging
It refers to axisymmetrical hollow forging whose axial length L is greater than its outer
diameter D, as shown in Figure la). t shall be the nominal thickness.
3.2
Ring forging
It refers to axisymmetrical hollow forging whose axial length L is less than or equal to its
outer diameter D, as shown in Figure lb). The smaller one of L and t shall be the nominal
thickness.
3.3
Disk forging
It refers to the axisymmetrical solid forging whose axial length Lis less than or equal to
its outer diameter D, as shown in Figure le). L shall be the nominal thickness.
3.4
Bowl forging
It refers to the axisymmetrical forging with concave section, whose height His less than
or equal to its outer diameter D, as shown in Figure ld). The greater one of t1 and t2 shall be
the nominal thickness.
3.5
Neck flange forging
It refers to the axisymmetrical hollow forging with two axial outside diameters, as shown
in Figure l e). The greater one oft1 and t2 shall be the nominal thickness.
3.6
Bar forging
It refers to the solid forging with circular section, whose axial length Lis greater than its
outer diameter D, as shown in Figure lf). D shall be the nominal thickness.
It refers to the forging with rectangular section, whose length L is greater than its both
side length a and b, as shown in Figure lg). The smaller one of a and b shall be the nominal
thickness.
7 Inspection Rules
7.1 Forgings shall be inspected by the Supplier's inspection department according to the
order contract.
7.2 Specimen for chemical analysis shall be prepared according to requirements of GB/T
20066. One specimen shall be taken from each smelting furnace number.
7.3 Sampling rules of tension and impact test
7.3.1 Sampling quantity
7.3.1.1 One group of specimens (one for tension, three for impact) shall be taken for
forgings with single weight less than or equal to 3500 kg in heat treatment.
7.3.1.2 Two groups of specimens in 180° interval shall be taken from the heat-treated
forgings whose weight of single piece is greater than 3500kg. If the length of the forging is
greater than 1. 5 times of its diameter, a group of specimens shall be taken from the both ends
of forging respectively.
7.3.2 Sampling direction
Tangential specimens should be taken from the forgings (excluding strip type); if
unavailable, the longitudinal or radial specimens shall be taken. Bar forging should be taken
longitudinal specimen.
7.3.3 Sampling position
7.3.3.1 Specimens ofhollow forgings and ring forgings shall be taken from the ends of the
forgings from the positions of 112 of the wall thickness, as shown in Figure 2a) and Figure
2b).
7.3.3.2 Specimens of disk forgings shall be taken from the ends of the forgings; where the
diameter of disk forging is less than or equal to 350mm, specimens shall be taken from the
outer edge; where the diameter is greater than 350mm, specimens shall be taken from the
position greater than or equal to 20mm away from the edge inwardly, as shown in Figure 2c ).
7.3.3.3 Specimens of bowl forgings shall be taken from the open ends of the forgings from
the positions of 112 of the wall thickness, as shown in Figure 2d).
7.3.3.4 Specimens of neck flange forgings shall be taken from the nominal thickness
positions greater than or equal to 20mm away from the outer edge inwardly (or outwardly
from the internal surface of the excess metal), as shown in Figure 2e).
7.3.3.5 Specimens of bar forgings shall be taken from the ends of the forgings from the
positions of 114 of the nominal thickness away from the surface.
7.3.3.6 Except Class IV forgings, the mechanical property specimens of forgings may also
be prepared and taken from the independently-forged inspection forging stocks of the same
batch number. Inspection forging stock shall have the same forging process and forging ratio
as the forging; its nominal thickness shall be greater than or equal to that of the forging, and it
shall be heat treated in the same furnace with the forging.
7.3.4 Specimen
7.3.4.1 Tensile specimens shall adopt No. R4 specimens (d=lOmm, L0=50mm) in GB/T
228.Due to the sampling dimensional restrictions, No. R7 specimens (d=5mm, L0=25mm) in
GB I T 228 may also be adopted according to the agreement between the Buyer and the
Supplier.
7.3.4.2 Impact specimen shall use the standard Charpy V-shape notch specimen in GB/T
8 Marking and Quality Certificate
8.1 lVIark shall be stamped at apparent position of forging or at the position designated by
the Buyer. The position of the printed marks and the way to stamp shall not affect the final
use of the forgings. For small sized forgings, marks may be stuck on the packing box.
8.2 The delivered forgings, qualified in the inspection according to this standard, shall
include the following marks.
a) lVIanufacturer's name (or code);
b) Standard number;
c) Steel grade;
d) Forging class;
e) Batch number.
8.3 Forgings shall be accompanied with quality certificate when delivering, including.
a) lVIanufacturer's name;
b) Order contract number;
c) Standard number, steel grade, forging class, batch number, forging quantity;
d) Each inspection result, inspection organization and inspectors' seals;
e) Heat treatment curve diagram (hard copy);
f) Inspection results of special requirements specified in the contract.
Appendix A (Normative)
Additional Requirements
This requirement will only be implemented when specified in order contract by the
Buyer. One or some of the items may be adopted, and the details of additional requirements
shall be determined through negotiation between the Buyer and the Supplier.
A.l Simulated post-weld heat treatment of mechanical property specimen blank
One or several heat treatments shall be carried out for all the specimen blanks below the
critical temperature before the test, for the purpose of simulating the post-weld heat treatment
or other heat treatment that the forgings wi...