GB/T 17107-1997 English PDF (GBT17107-1997)

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GB/T 17107-1997: Structural steel grades and mechanical property for forgings
GB/T 17107-1997
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140
H 40
Structural steel grades and mechanical property for
forgings
ISSUED ON: NOVEMBER 11, 1997
IMPLEMENTED ON: MAY 01, 1998
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Reference standards ... 4 
3 Grades and chemical composition ... 4 
4 Chemical composition deviation of finished product ... 20 
5 Mechanical properties ... 22 
6 Sampling locations of mechanical properties ... 23 
7 Sample ... 26 
8 Test methods ... 26 
9 Sampling quantity ... 26 
Appendix A (Normative) Reference standards for chemical analysis methods
... 27 
Foreword
This Standard, in accordance with the provisions of GB 221-79 "Notations for
Designations of Iron and Steel", for normalized and standardized management
of carbon structural steel forgings and alloy structural steel forgings, on the
basis of GB 700, GB 699, GB 3077, JB 1265, JB 1271, YB 475 etc., adds some
commonly used grades for carbon structural steel and alloy structural steel
forgings. In terms of grade settings, avoid overlapping with international ones.
With reference to domestic and foreign standards, based on a large number of
experimental studies, according to the characteristics of the forgings, specify
the chemical composition deviation and mechanical properties. The sampling
location is specified in detail in accordance with ASTM A 668, which is scientific
and reasonable. This makes the structural steel forgings’ grades, chemical
composition and chemical composition deviation of finished products,
mechanical properties, sample sampling locations have national unified
regulations, and to a certain extent in line with the international. Each
professional standard may, based on the provisions of this Standard, combined
with the characteristics of the industry and special circumstances, propose
technical regulations.
Appendix A of this Standard is normative.
This Standard was proposed by Ministry of Metallurgical Industry of the PRC.
This Standard shall be under the jurisdiction of Beijing Metallurgical Equipment
Research Design Institute Co., Ltd.
Drafting organizations of this Standard: Beiman Special Steel Co., Ltd., China
First Heavy Industries, Beijing Metallurgical Equipment Research Design
Institute Co., Ltd.
Main drafters of this Standard: Li Xinghua, Wang Mingjia, Li Yajun.
Structural steel grades and mechanical property for
forgings
1 Scope
This Standard specifies the grades, chemical composition, chemical
composition deviation of finished products, mechanical properties, and
sampling locations of mechanical properties, etc. of structural steel for forgings.
This Standard applies to general forgings for sampling determination of
mechanical properties after integral heat treatment in metallurgical, mining,
shipping, engineering machinery and other equipment.
The mechanical properties of this Standard do not apply to forgings such as
main shafts, rotors, impellers, and pressure vessels rotating at high
temperature and high speed in power station equipment.
2 Reference standards
The following standards contain provisions which, through reference in this
Standard, constitute provisions of this Standard. At the time of publication of
this Standard, the editions shown are valid. All standards will be revised. Parties
using this Standard shall explore the possibility of using the latest editions of
the following standards.
GB 223 Methods for chemical analysis of iron, steel and alloy (see Appendix
A)
GB 228-87 Metallic materials - Tensile testing
GB/T 229-94 Metallic Material - Charpy notch impact test
GB 231-84 Metallic materials - Brinell hardness test
GB 6397-86 Metallic materials - Test pieces for tensile testing
3 Grades and chemical composition
3.1 The grades and chemical composition (smelting analysis) of carbon
structural steel shall meet the requirements of Table 1.
6 Sampling locations of mechanical properties
6.1 The mechanical property samples shall be taken from the forging body or
its lengthened, enlarged, and thickened parts. The size of the lengthened,
enlarged, and thickened part is determined by the nominal diameter or
thickness of the rough machining of the forging, regardless of its thick end,
shoulder, flange, and journal. However, for normalized and tempered shaft
forgings, the sample portion may be an extension of the small diameter shaft
end, as shown in Figure 1.
6.2 The mechanical property samples are allowed to be taken on the blanks
with the same smelting furnace number and the same heat treatment heat. The
size of the blanks shall be equivalent to the size of the forging sampling location.
6.3 The longitudinal tensile sample of the forging, the center of the gauge length
or the axis of the tangential tensile sample and the position of the notch surface
of the impact sample shall be determined according to one of the following
methods.
a) The sample location of solid shaft forgings is at a 1/3 radius from the
surface. For the sample location of square and rectangular forgings, it may
be taken on the diagonal of the cross section 1/3 from the vertex. The
location of the hardened forging sample shall also be 90mm from the end
or a size equivalent to 1/2 diameter or thickness (the smaller of the two
values); see Figure 1a.
b) The sample location of hollow forgings shall be at 1/2 wall thickness. In
addition, the location of the hardened forging sample shall also be 90mm
from the end or a size equivalent to 1/2 wall thickness (the smaller of the
two values); see Figure 1b.
c) For disk forgings, when the sample portion is the outer diameter enlarged
part, the sample location is at 1/2 height. In addition, the location of the
hardened forging sample shall be 90mm from the outer diameter or a size
equivalent to 1/2 height (the smaller of the two values). When the sample
portion is the height thickened part, the sample location is at 1/2 thickness.
In addition, the location of the hardened forging sample shall be 90mm
from the surfaces or at 1/2 thickness (the smaller of the two values). See
Figure 1c.
d) For ring forgings, when the sample portion is the height lengthened part,
the sample location is at 1/2 wall thickness. In addition, the location of the
hardened forging sample shall be 90mm from the ring end face or a size
equivalent to 1/2 wall thickness (the smaller of the two values). When the
Appendix A
(Normative)
Reference standards for chemical analysis methods
GB 223.3-88 Methods for chemical analysis of iron, steel and alloy - The
diantipyryl methane phosphomolybdate gravimetric method for the
determination of phosphorus content
GB 223.5-88 Methods for chemical analysis of iron, steel and alloy - The oxalic
acid-ferrous sulfate molybdosilicate blue complex photometric method for the
determination of silicon content
GB/T 223.6-94 Methods for chemical analysis of iron, steel and alloy - The
neutralization titrimetric method for the determination of boron content
GB/T 223.11-91 Methods for chemical analysis of iron, steel and alloy - The
ammonium persulfate oxidation volumetric method for the determination of
chromium content
GB/T 223.12-91 Methods for chemical analysis of iron, steel and alloy - The
sodium carbonate separation-diphenyl carbazide photometric method for...