GB/T 3098.8-2010 English PDF (GB/T3098.8-2010)

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GB/T 3098.8-2010: Mechanical properties of fasteners -- Parts for bolted connections for use at temperatures from -200 Celsius~+700 Celsius
GB/T 3098.8-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 3098.8-1992
Mechanical properties of fasteners - Parts for bolted
connections for use at temperatures from -200 °C ~ +700 °C
ISSUED ON: JANUARY 10, 2011
IMPLEMENTED ON: OCTOBER 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Material and mechanical property grade ... 7
5 Inspection ... 15
6 Identification marks ... 17
7 Marking ... 17
Appendix A (Informative) Steel for high temperature or/and low temperature fasteners
- Comparison of material designations between national standard and DIN EN 10269
... 18
Foreword
This Part of GB/T 3098 (hereinafter referred to as this Part) is one of the national
standards "Mechanical properties of fasteners" series. The series includes:
a) GB/T 3098.1-2010 Mechanical properties of fasteners - Bolts, screws and studs;
b) GB/T 3098.2-2000 Mechanical properties of fasteners - Nuts - Coarse thread;
c) GB/T 3098.3-2000 Mechanical properties of fasteners - Set screws;
d) GB/T 3098.4-2000 Mechanical properties of fasteners - Nuts - Fine pitch thread;
e) GB/T 3098.5-2000 Mechanical properties of fasteners - Tapping screws;
f) GB/T 3098.6-2000 Mechanical properties of corrosion-resistant stainless-steel
fasteners - Part 1: Bolts, screws and studs;
g) GB/T 3098.7-2000 Mechanical properties of fasteners - Thread rolling screws;
h) GB/T 3098.8-2010 Mechanical properties of fasteners - Parts for bolted
connections for use at temperatures from -200 °C ~ +700 °C;
i) GB/T 3098.9-2010 Mechanical properties of fasteners - Prevailing torque type
steel nuts;
j) GB/T 3098.10-1993 Mechanical properties of fasteners - Bolts, screws, studs and
nuts made of non-ferrous metals;
k) GB/T 3098.11-2002 Mechanical properties of fasteners - Drilling screws with
taping screw thread;
l) GB/T 3098.12-1996 Mechanical properties of fasteners - Cone proof load test on
nuts;
m) GB/T 3098.13-1996 Mechanical properties of fasteners - Torsional test and
minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm;
n) GB/T 3098.14-2000 Mechanical properties of fasteners - Widening test on nuts;
o) GB/T 3098.15-2000 Mechanical properties of fasteners - Nuts made of stainless-
steel;
p) GB/T 3098.16-2000 Mechanical properties of fasteners - Set screws made of
stainless-steel;
q) GB/T 3098.17-1996 Mechanical properties of fasteners - Preloading test for the
Mechanical properties of fasteners - Parts for bolted
connections for use at temperatures from -200 °C ~ +700 °C
1 Scope
This part of GB/T 3098 specifies the material designations and mechanical properties
of bolts and nuts, as well as the relevant technical requirements for low temperature
toughness at -200 °C and high temperature strength at +700 °C.
As an important supplement to GB/T 3098.1, GB/T 3098.2, GB/T 3098.4, it is
applicable to the mechanical properties of fasteners in special working environments
with working temperatures below -50 °C or above +150 °C.
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 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-
2002, eqv ISO 6892:1998)
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs (GB/T
3098.1-2010, ISO 898-1:2009, MOD)
GB/T 3098.2 Mechanical properties of fasteners - Nuts - Coarse thread (GB/T
3098.2-2000, idt ISO 898-2:1992)
GB/T 3098.4 Mechanical properties of fasteners - Nuts - Fine pitch thread (GB/T
3098.4-2000, idt ISO 898-6:1994)
GB/T 3098.6 Mechanical properties of fasteners stainless steel bolts, screws and
studs (GB/T 3098.6-2000, idt ISO3506-1:1997)
GB/T 3098.15 Mechanical properties of fasteners stainless nut (GB/T 3098.15-2000,
idt ISO 3506-2:1997)
GB/T 3103.4 Tolerances for fasteners - Components for bolted connections made
mainly from materials with a high temperature strength
GB/T 3104 Fasteners - Widths across flats of hexagon products (GB/T 3104-1982,
eqv ISO 272:1982)
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method (GB/T
4340.1-2009, ISO 6507-1:2005, MOD)
GB/T13807.2 Connections with waisted stud - Studs (GB/T 13807.2-2008, DIN
2510-3/4/8:1971, MOD)
GB/T13807.3 Connections with waisted stud - Nuts, extension sleeves (GB/T
13807.3-2008, DIN 2510-5/6/7:1971, MOD)
DIN EN 10269:2006-07 Steels and nickel alloys for fasteners with specified
elevated and/or low temperature properties
AD 2000 - Instructions W2 1), austenitic and austenitic - Ferritic steels
AD 2000 - Instructions W7 1), bolts and nuts made of ferritic steel
AD 2000 - Instructions W10 1), low temperature materials - Iron materials
TRD 106 1) Steel bolts and nuts
VdTUV WB 113/2 2) Rolled or forged high temperature resistant austenitic steel,
×8 CrNiMoBNb16-16+wk - Material number Nr1.4986+wk
VdTUV WB 435/3 2) Rolled or forged heat-resistant austenitic steel, ×5Ni Cr Ti 26
15-16 - Material number Nr1.4980
VdTUV WB 490 2) Bolts and nuts made of heat-resistant steel 35B2 - Material
number Nr1.5511
3 Terms and definitions
The terms and definitions specified in DIN EN 10269, GB/T 3098.1, GB/T 3098.2,
GB/T 3098.4, GB/T 3098.6, GB/T 3098.15 apply to this Part.
4 Material and mechanical property grade
4.1 Mechanical properties
Table 1 gives austenitic steel fasteners with a minimum operating temperature of -
200 °C. The properties of the material shall comply with the provisions of GB/T 3098.6
and GB/T 3098.15.
1 Source: Beuth Publishing Co., Ltd., Berlin 10772.
2 Source: TÜV Publishing Co., Ltd. Rheinland, Postal Code 101750, 50672 Cologne.
- The tensile strength of the nut material shall be higher than 70% of the tensile
strength of the bolt material;
- The reasonable matching of bolt and nut materials is shown in Table 3.
Note: If the bolt material is selected according to Table 3 and a load-bearing sleeve is used, the
load-bearing sleeve shall preferably be made of the same material as the bolt.
4.2.2 Bolts with full load capacity
Bolts that meet the following requirements at the time of fracture can be considered to
have full load capacity:
- When the bolts are subjected to a tensile test, the minimum tensile load (Rm,min ×
As, nominal) in Table 4a or Table 5a can be reached;
- When the bolts made of steel and nickel-chromium steel in Table 2 are tested
according to GB/T 3098.1, the fracture shall occur within the length of the
unthreaded thread;
- When the bolts made of austenitic steel in Table 1 are tested according to GB/T
3098.6, the fracture shall occur within the length of the unthreaded thread or the
unthreaded shank.
4.2.3 Nuts with full load capacity
When broken, nuts that meet the following requirements can be considered to have full
load capacity:
- The nut can withstand the minimum tensile load of the bolt given in Table 4a or
Table 5a (Rm,min × As, nominal);
- The outer diameter of the round nut or the minimum width across flats of the
hexagonal nut meets the requirements of GB/T 3104;
- The minimum height of the coarse-pitch nut meets the requirements of Type 1; the
minimum height of the fine-pitch nut meets the requirements of Type 2.
performed on the actual bolts in accordance with GB/T 3098.6 to determine RP0.2, Rm,
A.
For bolts with full load-bearing capacity and materials in accordance with Table 2, a
tensile test is performed on the actual bolts in accordance with GB/T 3098.1 to
determine Rm (Table 3).
5.3 Nuts with full load-bearing capacity
Arbitration test:
For nuts with full load-bearing capacity and materials in accordance with Table 1 or
Table 2, the proof load is determined in accordance with GB/T 3098.2 or GB/T 3098.4
(Table 4b or Table 5b).
5.4 Bolts with reduced load-bearing capacity
Arbitration test:
For waisted shank bolts with reduced load-bearing capacity and materials in accordance
with Table 1, a tensile test is performed on the actual bolts in accordance with GB/T
228 to determine: RP0.2, Rm, A, Z (according to DIN EN 10269).
For bolts with reduced bearing capacity and materials in accordance with Table 1, low
head bearing capacity, and uniform performance (such as grade 50, state as +AT
according to DIN EN 10269), tensile tests are carried out on machined samples
according to GB/T 228 to determine: RP0.2, Rm, A, Z (according to DIN EN 10269).
For bolts with reduced bearing capacity and materials in accordance with Table 1, low
head bearing capacity, grade 70 (state as +C700 according to DIN EN 10269), and cold
work hardened, tensile tests are carried out on the actual bolts according to GB/T 3098.6
to determine the minimum tensile load.
For bolts with reduced bearing capacity and materials in accordance with Table 2,
tensile tests are carried out on machined samples according to GB/T228 to determine:
RP0.2, Rm, A, Z (according to DIN EN 10269). Only when the bolt length cannot be
subjected to tensile testing, its Vickers hardness value is tested according to GB/T
4340.1 (according to GB/T 3098.1).
5.5 Nuts with reduced load capacity
For nuts with reduced load capacity and materials in accordance with Table 1, the proof
load shall be determined according to GB/T 3098.2 or GB/T 3098.4.
For nuts with reduced load capacity and materials in accordance with Table 2, the
Vickers hardness shall be determined according to Table 2 and GB/T 4340.1.
6 Identification marks
Connector products that meet the requirements of this Part must have the manufacturer's
identification mark; the steel group and performance grade shall be made according to
Table 1, or the manufacturer's identification mark and material abbreviation shall be
made according to Table 2. If there is no other agreement, the marking requirements
shall be selected from GB/T 3098.6, GB/T 3098.15 or GB/T 3098.4, or GB/T13807.2
and GB/T 13807.3.
When the design of austenitic bolts or nuts requires a certain material, the material
number shall be used instead of the steel group selected according to GB/T 3098.6 or
GB/T 3098.15.
7 Marking
Fasteners made of cold-toughness or high-temperature strength materials shall be
marked with the steel group and performance grade according to Table 1, or the
abbreviation of the material shall be marked according to Table 2, for example:
Marking of equal-length double-headed studs with thread specification d = M30,
nominal length l = 200 mm, L-type, material A4-70, product grade TB, surface with
oxidation treatment:
Stud GB/T 13807.2 LM30×200-TB-A4-70-Oxidation
Marking of equal-length double-headed studs with thread specification d = M30,
nominal length l = 200 mm, L-type, material GA, product grade TB, surface with
oxidation treatment:
Stud GB/T 13807.2 LM30×200-TB-GA-oxidation
When austenitic bolts or nuts are designed with certain materials, the material number
shall be used instead of the marking of the steel group selected according to GB/T
3098.6 or GB/T 3098.15:
Stud GB/T 13807.2 LM30×200-TB-1.4541-70-oxidation
GB/T 3098.8-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 3098.8-1992
Mechanical properties of fasteners - Parts for bolted
connections for use at temperatures from -200 °C ~ +700 °C
ISSUED ON: JANUARY 10, 2011
IMPLEMENTED ON: OCTOBER 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Material and mechanical property grade ... 7
5 Inspection ... 15
6 Identification marks ... 17
7 Marking ... 17
Appendix A (Informative) Steel for high temperature or/and low temperature fasteners
- Comparison of material designations between national standard and DIN EN 10269
... 18
Foreword
This Part of GB/T 3098 (hereinafter referred to as this Part) is one of the national
standards "Mechanical properties of fasteners" series. The series includes:
a) GB/T 3098.1-2010 Mechanical properties of fasteners - Bolts, screws and studs;
b) GB/T 3098.2-2000 Mechanical properties of fasteners - Nuts - Coarse thread;
c) GB/T 3098.3-2000 Mechanical properties of fasteners - Set screws;
d) GB/T 3098.4-2000 Mechanical properties of fasteners - Nuts - Fine pitch thread;
e) GB/T 3098.5-2000 Mechanical properties of fasteners - Tapping screws;
f) GB/T 3098.6-2000 Mechanical properties of corrosion-resistant stainless-steel
fasteners - Part 1: Bolts, screws and studs;
g) GB/T 3098.7-2000 Mechanical properties of fasteners - Thread rolling screws;
h) GB/T 3098.8-2010 Mechanical properties of fasteners - Parts for bolted
connections for use at temperatures from -200 °C ~ +700 °C;
i) GB/T 3098.9-2010 Mechanical properties of fasteners - Prevailing torque type
steel nuts;
j) GB/T 3098.10-1993 Mechanical properties of fasteners - Bolts, screws, studs and
nuts made of non-ferrous metals;
k) GB/T 3098.11-2002 Mechanical properties of fasteners - Drilling screws with
taping screw thread;
l) GB/T 3098.12-1996 Mechanical properties of fasteners - Cone proof load test on
nuts;
m) GB/T 3098.13-1996 Mechanical properties of fasteners - Torsional test and
minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm;
n) GB/T 3098.14-2000 Mechanical properties of fasteners - Widening test on nuts;
o) GB/T 3098.15-2000 Mechanical properties of fasteners - Nuts made of stainless-
steel;
p) GB/T 3098.16-2000 Mechanical properties ...