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GB/T 3098.15-2014 English PDF (GBT3098.15-2014)

GB/T 3098.15-2014 English PDF (GBT3098.15-2014)

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GB/T 3098.15-2014: Mechanical properties of fasteners Nuts made of stainless-steel

This Part of GB/T 3098 specifies the mechanical properties of nuts made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 ~ 35 degree Celcius. Properties vary at higher or lower temperatures.
GB/T 3098.15-2014
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 21.060.20
J 13
Replacing GB/T 3098.15-2000
Mechanical Properties of Fasteners ?€?
Stainless Steel Nuts
(ISO 3506-2.2009, Mechanical Properties of Corrosion-resistant
Stainless Steel Fasteners ?€? Part 2. Nuts, MOD)
ISSUED ON. JUNE 24, 2014
IMPLEMENTED ON. MARCH 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Application Scope ... 6
2 Normative References ... 7
3 Symbols ... 8
4 Designation, Marking and Finish ... 8
5 Chemical Composition ... 11
6 Mechanical Properties ... 12
7 Test Methods ... 13
Annex A (Informative) Description of the Groups and Grades of Stainless Steels ... 15
Annex B (Informative) Stainless Steel Composition Specifications ... 18 Annex C (Informative) Stainless Steels for Cold Heading and Extruding ... 21 Annex D (Informative) Austenitic Stainless Steels with Particular Resistance to Chloride Induced Stress Corrosion ... 23
Annex E (Informative) Mechanical Properties at Elevated Temperatures;
Application at Low Temperatures ... 24
Annex F (Informative) Time-temperature Diagram of Intergranular Corrosion in Austenitic Stainless Steels, Grade A2 (18/8 Steels) ... 26
Annex G (Informative) Magnetic Properties for Austenitic Stainless Steels ... 27 Bibliography ... 28
Foreword
GB/T 3098, Mechanical Properties of Fasteners, includes the following parts. -- GB/T 3098.1, Mechanical Properties of Fasteners ?€? Bolts, Screws and Studs -- GB/T 3098.2, Mechanical Properties of Fasteners ?€? Nuts - Coarse Thread -- GB/T 3098.3, Mechanical Properties of Fasteners ?€? Set Screws
-- GB/T 3098.4, Mechanical Properties of Fasteners ?€? Nuts ?€? Fine Pitch Thread -- 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 ?€? Bolted Connection Parts Used at ?€? 200??C to + 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 Tapping 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 1mm to 10mm
-- GB/T 3098.14, Mechanical Properties of Fasteners ?€? Widening Test on Nuts -- GB/T 3098.15, Mechanical Properties of Fasteners ?€? Nuts Made of Stainless- steel
-- 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 additionally be marked with the symbol ?€?P?€? ...?€? and ?€?the additional marking should be applied to both the fastener and the label?€? (4.3);
-- it adds ?€?The chemical compositions given in Table 1 correspond with the chemical compositions given in GB/T 3098.6-2014, Table 1, for the relevant steel grades?€? (see Note to Chapter 5);
-- it adds for F1 ?€?niobium (columbium) and/or tantalum ??? 10 ?? C up to 1.0 % maximum?€? (see Table 1);
-- it adds ?€?... this does not mean that all classes are appropriate for all nuts?€? (see Note to Chapter 6).
This Part was drafted by modifying and referencing ISO 3506-2.2009, Mechanical Properties of Corrosion-resistant Stainless Steel Fasteners ?€? Part 2. Nuts; the technical changes are as follows.
-- it changes the name into Mechanical Properties of Fasteners ?€? Stainless Steel Nuts;
-- in the normative references, it uses Chinese standards to replace international standards (see Chapter 2); and
-- ISO 3506-2 specifies ?€?The designation of the steel grade (first block) consists of the letters...?€? which is incorrect, and it is changed into ?€?The designation of the steel grade (first block) consists of the letters ... and a digit ...?€?. This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of the National Standardization Technical Committee on Fasteners (SAC/TC 85).
The responsible drafting organizations of this Part. China Productivity Center for Machinery.
The contributory drafting organizations of this Part. Zhoushan Zhengyuan Standard Parts Co., Ltd. and Zhejiang Gaoqiangdu Fasteners Co., Ltd.
The previous editions of the standard replaced by this Part are as follows. -- relevant part of GB 3098.6-1986, and GB/T 3098.15-2000.
Mechanical Properties of Fasteners ?€?
Stainless Steel Nuts
1 Application Scope
This Part of GB/T 3098 specifies the mechanical properties of nuts made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10??C to 35??C. Properties vary at higher or lower temperatures.
This Part of GB/T 3098 applies to nuts.
-- with nominal thread diameter D ??? 39 mm;
-- of general purpose metric threads with diameters and pitches in accordance with GB/T 192, GB/T 193 and GB/T 9144;
-- of any shape;
-- with width across flats as specified in GB/T 3104; and
-- with nominal heights m ??? 0.5D.
It does not apply to nuts requiring properties such as
-- locking abilities, and
-- weldability.
NOTE The designation system of this Part of GB/T 3098 can be used for sizes outside the limits given in this clause (e.g. D > 39 mm), provided that all applicable mechanical and physical requirements of the property classes are met.
This Part of GB/T 3098 does not define corrosion or oxidation resistance in particular environments. However, some information on materials for particular environments is given in Annex D. Regarding definitions of corrosion and corrosion resistance, see GB/T 10123.
The aim of this Part of GB/T 3098 is the classification of corrosion-resistant stainless steel nuts into property classes. Some materials can be used at temperatures down to ??? 200??C, some can be used at temperatures up to + 800??C in air. Information on the influence of temperature on mechanical properties is found in Annex E.
Corrosion and oxidation performances and mechanical properties for use at elevated or sub-zero temperatures can be agreed on between the user and the manufacturer in each particular case. Annex F shows how the risk of intergranular corrosion at elevated temperatures depends on the carbon content.
All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some magnetic properties can be evident (see Annex G). 2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced document (including any amendments) applies to this Standard.
GB/T 90.3, Fasteners ?€? Quality Assurance System (GB/T 90.3-2010, ISO
16426.2002, IDT)
GB/T 192, General Purpose Metric Screw Threads ?€? Basic Profile (GB/T 192-2003, ISO 68-1.1998, MOD)
GB/T 193, General Purpose Metric Screw Threads ?€? General Plan (GB/T 193-2003, ISO 261.1998, MOD)
GB/T 230.1, Metallic Materials ?€? Rockwell Hardness Test ?€? Part 1. Test Method (Scales A, B, C, D, E, F, G, H, K, N, T) (GB/T 230.1-2009, ISO6508-1.2005, MOD) GB/T 231.1, Metallic Materials ?€? Brinell Hardness Test ?€? Part 1. Test Method (GB/T 231.1-2009, ISO 6506-1.2005, MOD)
GB/T 3098.2, Mechanical properties of fasteners ?€? Nuts ?€? Coarse thread
GB/T 3104, Fasteners ?€? Widths of Across Flats of Hexagon Products (GB/T 3104- 1982, eqv ISO 272.1982)
GB/T 4334, Corrosion of Metals and Alloys ?€? Test Methods for Intergranular Corrosion of Stainless Steels (GB/T 4334-2008, ISO 3561-1.1998 and ISO 3561- 2.1998, MOD)
GB/T 4340.1, Metallic materials ?€? Vickers hardness test ?€? Part 1. Test method (GB/T 4340.1-2009, ISO 6507-1.2005, MOD)
GB/T 5267.4, Passivation of Corrosion-resistant Stainless-steel Fasteners (GB/T 5267.4-2009, ISO 16048.2003, IDT)
GB/T 9144, General Purpose Metric Screw Threads ?€? Preferable Plan (GB/T 9144- 2003, ISO 262.1998, MOD)
Key
s width across flats
Figure 3 ?€? Alternative Groove Marking (for Steel Grades A2 and A4 Only) When the marking is made with grooves (see Figu...

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