GB/T 3098.6-2023 English PDF (GB/T3098.6-2023)

GB/T 3098.6-2023: Mechanical properties of fasteners - Stainless steel bolts, screws and studs
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GB/T 3098.6-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
CCS J 13
Replacing GB/T 3098.6-2014
Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
(ISO 3506-1:2020, Fasteners - Mechanical properties of corrosion-resistant stainless
steel fasteners - Part 1: Bolts, screws and studs with specified grades and performance
classes, MOD)
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
Introduction ... 8
1 Scope ... 11
2 Normative references ... 12
3 Terms and definitions ... 13
4 Symbols ... 14
5 Stainless steel group and performance grade marking system ... 16
5.1 General... 16
5.2 Stainless steel group marking (part 1) ... 17
5.3 Marking of performance grade (part 2) ... 17
6 Materials ... 18
6.1 Chemical composition ... 18
6.2 Heat treatment of martensitic stainless steel fasteners ... 21
6.3 Surface finishing ... 21
6.4 Corrosion resistance ... 21
7 Mechanical and physical properties ... 22
8 Applicability of test methods and inspections ... 28
8.1 Applicability of test methods ... 28
8.2 Load-bearing capacity of fasteners ... 28
8.3 Manufacturer's inspection ... 30
8.4 Supplier inspection ... 30
8.5 Buyer inspection ... 31
8.6 Delivery of test results ... 31
9 Test method ... 31
9.1 Tensile test ... 31
9.2 Tensile test of bolts and screws with reduced load capacity due to head design ... 39
9.3 Tensile test of bolts, screws, studs with reduced load capacity due to shank design . 40
9.4 Wedge load test ... 41
9.5 Torque test ... 43
9.6 Hardness test ... 45
10 Marking and labeling of fasteners ... 46
10.1 Marking ... 46
10.2 Manufacturer's identification mark ... 48
10.3 Fastener marking ... 48
10.4 Packaging marking (label) ... 52
Appendix A (Informative) Mechanical properties at high temperatures and application
at low temperatures ... 54
References ... 56
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document is Part 6 of GB/T 3098 "Mechanical properties of fasteners". GB/T 3098
has published the following parts:
- GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs;
- GB/T 3098.2 Mechanical properties of fasteners - Nuts;
- GB/T 3098.3 Mechanical properties of fasteners - Set screws;
- GB/T 3098.5 Mechanical properties of fasteners - Tapping screws;
- GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and
studs;
- GB/T 3098.7 Mechanical properties of fasteners - Thread rolling screws;
- GB/T 3098.8 Mechanical properties of fasteners - Parts for bolted connections for
use at temperatures from-200 °C ~ +700 °C
- GB/T 3098.9 Mechanical properties of fasteners - Prevailing torque type steel nuts;
- GB/T 3098.10 Mechanical properties of fasteners - Bolts, screws, studs and nuts
made of non-ferrous metals;
- GB/T 3098.11 Mechanical properties of fasteners - Drilling screws with taping
screw thread;
- GB/T 3098.12 Mechanical properties of fasteners - Cone proof load test on nuts;
- GB/T 3098.13 Mechanical properties of fasteners - Torsional test and minimum
torques for bolts and screws with nominal diameters 1 mm to 10 mm;
- GB/T 3098.14 Mechanical properties of fasteners - Widening test on nuts;
- GB/T 3098.15 Mechanical properties of fasteners - Stainless steel nuts;
- GB/T 3098.16 Mechanical properties of fasteners - Stainless steel set screws;
- GB/T 3098.17 Mechanical properties of fasteners - Preloading test for the detection
of hydrogen embrittlement-Parallel bearing surface method;
- GB/T 3098.18 Mechanical properties of fasteners - Blind rivets testing;
- GB/T 3098.19 Mechanical properties of fasteners - Blind rivets with break pull
mandrel;
- GB/T 3098.20 Mechanical properties of fasteners - Wing nuts with specified proof
torque;
- GB/T 3098.21 Mechanical properties of fasteners - Stainless steel tapping screws;
- GB/T 3098.22 Mechanical properties of fasteners made of the fine grain non-heat
treatment steel - Bolts, screws and studs;
- GB/T 3098.23 Mechanical properties of fasteners - M42 ~ M72 bolts, screws and
studs;
- GB/T 3098.24 Mechanical properties of fasteners - Stainless steel and nickel alloys
bolts, screws, studs and nuts for high temperature applications;
- GB/T 3098.25 Mechanical properties of fasteners - Guidance for the selection of
stainless steels and nickel alloys for fasteners;
- GB/T 3098.26 Mechanical properties of fasteners - Flat washers.
This document replaces GB/T 3098.6-2014 "Mechanical properties of fasteners -
Stainless steel bolts, screws and studs". Compared with GB/T 3098.6-2014, in addition
to structural adjustments and editorial changes, the main technical changes are as
follows:
a) ADD duplex (austenite-ferrite) stainless steel with performance grades of 70, 80,
100 (see Figure 1);
b) ADD the austenitic stainless steel performance grade 100 and group A8 (see
Figure 1);
c) CHANGE the surface finishing (see 6.3; Chapter 4 of the 2014 edition);
d) ADD the stainless steel bolt and nut group matching (see 6.4);
e) ADD the minimum tensile load and minimum load calculation value when the
specified plastic elongation is 0.2%, as well as the principle of numerical
rounding (see Table 4 ~ Table 7);
f) ADD the fasteners with reduced bearing capacity due to head structure or rod
structure (see 8.2);
g) ADD the inspection procedure requirements and guidance (see 8.3 ~ 8.6);
h) ADD the applicability of full load capacity and reduced load capacity test methods
(see Chapter 8);
Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
1 Scope
This document specifies the mechanical and physical properties of coarse and fine
thread bolts, screws and studs (hereinafter referred to as fasteners) made of corrosion-
resistant stainless steel, when tested at an ambient temperature of 10 °C ~ 35 °C. The
performance grades corresponding to the groups of austenitic, martensitic, ferritic,
duplex (austenitic-ferritic) stainless steel fasteners are specified.
GB/T 3098.25 provides general rules and additional technical information on applicable
stainless steels and their properties.
Fasteners that meet the requirements of this document are tested at an ambient
temperature of 10 °C ~ 35 °C. At higher and/or lower temperatures, fasteners may not
maintain the specified mechanical and physical properties.
Note 1: Fasteners that meet the requirements of this document are used at temperatures of -
20 °C ~ +150 °C, but can also be used at low temperatures of -196 °C and high temperatures of
+300 °C. For more detailed information, see Appendix A and GB/T 3098.25.
When used outside the temperature range of -20 °C ~ +150 °C, the user is responsible
for consulting an experienced fastener material expert and considering the influences
of stainless steel composition, exposure time at high or low temperatures, temperature
on the mechanical properties of the fastener and the clamped parts, as well as the
corrosive use environment of the bolted connection, to determine the appropriate
selection for the specific application.
Note 2: When the use temperature is up to +800 °C, GB/T 3098.24 gives the selection of
appropriate stainless steel groups and performance grades.
Fasteners to which this document applies:
- Ordinary threads in accordance with GB/T 192;
- Diameter and pitch combinations in accordance with GB/T 193 and GB/T 9144;
- Coarse thread M1.6 ~ M39, fine thread M8×1 ~ M39×3;
- Thread tolerances in accordance with GB/T 197 and GB/T 9145;
- Specified performance grades;
GB/T 3098.6-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
CCS J 13
Replacing GB/T 3098.6-2014
Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
(ISO 3506-1:2020, Fasteners - Mechanical properties of corrosion-resistant stainless
steel fasteners - Part 1: Bolts, screws and studs with specified grades and performance
classes, MOD)
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
Introduction ... 8
1 Scope ... 11
2 Normative references ... 12
3 Terms and definitions ... 13
4 Symbols ... 14
5 Stainless steel group and performance grade marking system ... 16
5.1 General... 16
5.2 Stainless steel group marking (part 1) ... 17
5.3 Marking of performance grade (part 2) ... 17
6 Materials ... 18
6.1 Chemical composition ... 18
6.2 Heat treatment of martensitic stainless steel fasteners ... 21
6.3 Surface finishing ... 21
6.4 Corrosion resistance ... 21
7 Mechanical and physical properties ... 22
8 Applicability of test methods and inspections ... 28
8.1 Applicability of test methods ... 28
8.2 Load-bearing capacity of fasteners ... 28
8.3 Manufacturer's inspection ... 30
8.4 Supplier inspection ... 30
8.5 Buyer inspection ... 31
8.6 Delivery of test results ... 31
9 Test method ... 31
9.1 Tensile test ... 31
9.2 Tensile test of bolts and screws with reduced load capacity due to head design ... 39
9.3 Tensile test of bolts, screws, studs with reduced load capacity due to shank design . 40
9.4 Wedge load test ... 41
9.5 Torque test ... 43
9.6 Hardness test ... 45
10 Marking and labeling of fasteners ... 46
10.1 Marking ... 46
10.2 Manufacturer's identification mark ... 48
10.3 Fastener marking ... 48
10.4 Packaging marking (label) ... 52
Appendix A (Informative) Mechanical properties at high temperatures and application
at low temperatures ... 54
References ... 56
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document is Part 6 of GB/T 3098 "Mechanical properties of fasteners". GB/T 3098
has published the following parts:
- GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs;
- GB/T 3098.2 Mechanical properties of fasteners - Nuts;
- GB/T 3098.3 Mechanical properties of fasteners - Set screws;
- GB/T 3098.5 Mechanical properties of fasteners - Tapping screws;
- GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and
studs;
- GB/T 3098.7 Mechanical properties of fasteners - Thread rolling screws;
- GB/T 3098.8 Mechanical properties of fasteners - Parts for bolted connections for
use at temperatures from-200 °C ~ +700 °C
- GB/T 3098.9 Mechanical properties of fasteners - Prevailing torque type steel nuts;
- GB/T 3098.10 Mechanical properties of fasteners - Bolts, screws, studs and nuts
made of non-ferrous metals;
- GB/T 3098.11 Mechanical properties of fasteners - Drilling screws with taping
screw thread;
- GB/T 3098.12 Mechanical properties of fasteners - Cone proof load test on nuts;
- GB/T 3098.13 Mechanical properties of fasteners - Torsional test and minimum
torques for bolts and screws with nominal diameters 1 mm to 10 mm;
- GB/T 3098.14 Mechanical properties of fasteners - Widening test on nuts;
- GB/T 3098.15 Mechanical properties of fasteners - Stainless steel nuts;
- GB/T 3098.16 Mechanical properties of fasteners - Stainless steel set screws;
- GB/T 3098.17 Mechanical properties of fasteners - Preloading test for the detection
of hydrogen embrittlement-Parallel bearing surface method;
- GB/T 3098.18 Mechanical properties of fasteners - Blind rivets testing;
- GB/T 3098.19 Mechanical properties of fasteners - Blind rivets with break pull
mandrel;
- GB/T 3098.20 Mechanical properties of fasteners - Wing nuts with specified proof
torque;
- GB/T 3098.21 Mechanical properties of fasteners - Stainless steel tapping screws;
- GB/T 3098.22 Mechanical properties of fasteners made of the fine grain non-heat
treatment steel - Bolts, screws and studs;
- GB/T 3098.23 Mechanical properties of fasteners - M42 ~ M72 bolts, screws and
studs;
- GB/T 3098.24 Mechanical properties of fasteners - Stainless steel and nickel alloys
bolts, screws, studs and nuts for high temperature applications;
- GB/T 3098.25 Mechanical properties of fasteners - Guidance for the selection of
stainless steels and nickel alloys for fasteners;
- GB/T 3098.26 Mechanical properties of fasteners - Flat washers.
This document replaces GB/T 3098.6-2014 "Mechanical properties of fasteners -
Stainless steel bolts, screws and studs". Compared with GB/T 3098.6-2014, in addition
to structural adjustments and editorial changes, the main technical changes are as
follows:
a) ADD duplex (austenite-ferrite) stainless steel with performance grades of 70, 80,
100 (see Figure 1);
b) ADD the austenitic stainless steel performance grade 100 and group A8 (see
Figure 1);
c) CHANGE the surface finishing (see 6.3; Chapter 4 of the 2014 edition);
d) ADD the stainless steel bolt and nut group matching (see 6.4);
e) ADD the minimum tensile load and minimum load calculation value when the
specified plastic elongation is 0.2%, as well as the principle of numerical
rounding (see Table 4 ~ Table 7);
f) ADD the fasteners with reduced bearing capacity due to head structure or rod
structure (see 8.2);
g) ADD the inspection procedure requirements and guidance (see 8.3 ~ 8.6);
h) ADD the applicability of full load capacity and reduced load capacity test methods
(see Chapter 8);
Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
1 Scope
This document specifies the mechanical and physical properties of coarse and fine
thread bolts, screws and studs (hereinafter referred to as fasteners) made of corrosion...