GB/T 3098.24-2020 PDF English
US$680.00 · In stock · Download in 9 secondsGB/T 3098.24-2020: Mechanical properties of fasteners - Stainless steel and nickel alloys bolts, screws, studs and nuts for high temperature applications Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3098.24-2020 | English | 680 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Mechanical properties of fasteners - Stainless steel and nickel alloys bolts, screws, studs and nuts for high temperature applications
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 3098.24-2020
GB/T 3098.24-2020: Mechanical properties of fasteners - Stainless steel and nickel alloys bolts, screws, studs and nuts for high temperature applications
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3098.24-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10; 21.060.20
J 13
Mechanical properties of fasteners - Stainless steel and
nickel alloys bolts, screws, studs and nuts for high
temperature applications
Issued on. NOVEMBER 19, 2020
Implemented on. JUNE 01, 2021
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 7
2 Normative references... 8
3 Terms and definitions... 9
4 Codes... 10
5 Marking system... 12
6 Materials and processing... 12
7 Mechanical properties... 19
8 Applicability of test methods and inspections... 26
9 Test methods under ambient temperature conditions... 27
10 Test methods under elevated temperature conditions... 42
11 Marking... 53
Appendix A (Informative) Designation and chemical composition of high temperature
stainless steel and nickel alloy (national standard) for fasteners... 58
Appendix B (Informative) Tempering of Martensitic stainless steel... 63
References... 66
1 Scope
This Part of GB/T 3098 specifies the mechanical property requirements of bolts, screws,
studs and nuts made of corrosion-resistant stainless steel and nickel alloys, for use at
high temperatures up to 800 °C when tested at an ambient temperature of 10 °C ~ 35 °C.
Note. The fasteners specified in this Part are also suitable for use at low temperatures, usually
to -50 °C. For more information, see GB/T 3098.25.
This Part specifies the properties of fasteners made of three types of materials.
martensitic stainless steel, austenitic precipitation hardening stainless steel, nickel
alloys. GB/T 3098.25 provides general rules and additional technical information on
applicable stainless steel and nickel alloys and their properties.
Fasteners applicable to this Part.
- Ordinary threads in accordance with GB/T 192;
- Combinations of diameter and pitch in accordance with GB/T 193;
- Tolerances in accordance with GB/T 197 and GB/T 9145;
- Coarse thread M3 ~ M39; fine thread M8 × 1 ~ M39 × 3;
- Full load-bearing capacity fasteners of any shape.
The provisions of this Part also apply to fasteners whose dimensions exceed the
applicable range but meet all use requirements.
This Part does not cover fasteners with reduced load-bearing capacity (such as thin nuts
and bolts, screws and studs whose head and shank strength is lower than that of the
threaded part).
This Part does not specify the following performance requirements.
- Torque-clamping force performance;
- Shear strength;
- Fatigue resistance;
- Weldability;
- Locking performance.
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 90.3 Fasteners - Quality assurance system
GB/T 192 General purpose metric screw threads - Basic profile
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1.Test method
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
GB/T 1800.2 Geometrical product specifications (GPS) - ISO code system for
tolerances on linear sizes - Part 2.Tables of standard tolerance classes and limit
deviations for holes and shafts
3 Terms and definitions
The terms and definitions as defined in GB/T 3098.25, as well as the following terms
and definitions, apply to this document.
3.1
Stainless steel
Steel with stainless and corrosion resistance as its main characteristics, which has a
chromium (Cr) content of at least 10.5% and a carbon (C) content of no more than
1.2%.
3.2
Martensitic stainless steel
Stainless steel with a martensitic matrix, magnetic properties, whose mechanical
properties can be adjusted by heat treatment.
3.3
Precipitation hardening stainless steel
Stainless steel with austenite or martensitic matrix that can be strengthened
(hardened) by precipitation hardening (also known as aging hardening).
3.4
Nickel alloy
Alloy with a nickel content of not less than 50%.
3.5
Soaking time
The time the workpiece is kept at the temperature specified by the process.
3.6
Bolt and screw with full loadability
Bolts and screws or full-thread screws with head strength greater than the threaded
part and the unthreaded shank (ds≈d2 or ds > d2) and meeting the minimum ultimate
tensile load.
4 Codes
The following codes apply to this document.
A. The elongation of the fastener after breaking, in millimeters (mm);
As,nom. The nominal stress cross-sectional area of the thread, in square millimeters
(mm2);
AT. The elongation of the fastener after breaking at high temperature, in millimeters
(mm);
b. The length of the thread, in millimeters (mm);
D. The nominal diameter of the internal thread, in millimeters (mm);
D2.The basic middle diameter of the internal thread, in millimeters (mm);
d. The nominal diameter of the external thread, in millimeters (mm);
dh. The aperture of the tensile test device or the nut load-keeping test device for
external threaded fasteners, in millimeters (mm);
ds. The diameter of the unthreaded rod, in millimeters (mm);
d1.The basic minor diameter of the external thread, in millimeters (mm);
d2.The basic middle diameter of the external thread, in millimeters (mm);
L0.Total length of fastener before load application, in millimeter (mm);
L1.Total length of fastener after breaking, in millimeter (mm);
5 Marking system
All stainless steels and nickel alloys specified in this Part belong to three different
categories.
6 Materials and processing
6.1 Chemical composition
Tables 1 ~ 3 specify the chemical composition limits of stainless steel and nickel alloys
for fasteners. The chemical composition shall be evaluated according to the relevant
national standards. For information on domestic corresponding categories of materials,
see Appendix A.
6.4 Design of bolt and nut connection pairs
Bolts, screws and studs and nuts matching combinations shall be as specified in Table
5.
6.5 High temperature environment
The high temperature materials for fasteners specified in this Part are mainly suitable
for temperatures where creep strength is usually the size factor and high temperature
oxidation occurs (it shall be noted that SD, SB and 718 materials also have good
corrosion resistance in humid environments).
6.6 Fastener service temperature
Chapter 7 gives the mechanical properties of fasteners when tested in an ambient
temperature range of 10 °C ~ 35 °C.
7 Mechanical properties
7.1 Mechanical properties of bolts, screws and studs
When tested in accordance with the methods specified in Chapter 9, all mechanical
property requirements of bolts, screws and studs with specified fastener codes shall
comply with the provisions of Tables 7 ~ 11 under ambient temperature conditions,
regardless of whether the test is conducted during the manufacturing process or on the
final product.
8 Applicability of test methods and inspections
8.1 Applicability of test methods
The applicability of test methods is shown in Table 15.
8.2 Inspection by the manufacturer
Fasteners produced in accordance with this Part shall comply with all applicable
requirements specified in Chapters 6 and 7, when tested according to the suitability tests
specified in 8.1 and Chapter 9.
8.3 Inspection by the supplier
If the chemical composition and mechanical properties requirements specified in
Chapters 6 and 7 are met, the supplier may choose its own method to control and/or
inspect the fasteners (regular evaluation of the manufacturer, verification of the test
results provided by the manufacturer, physical inspection of the fasteners, etc.).
8.4 Inspection by the purchaser
The purchaser may control and/or inspect the delivered fasteners according to the test
methods specified in Chapter 9.
8.5 Delivery of test results
When the purchaser requires the test results of the supplier, it shall be agreed upon at
the time of ordering.
9 Test methods under ambient temperature conditions
9.1 Tensile test of bolts, screws and studs
9.1.1 General
This test is used to determine the following parameters simultaneously or separately.
9.1.2 Test procedure for simultaneous determination of Rmf, Rpf and A
The load F shall be measured continuously until fracture occurs, directly using an
electronic device (such as a microprocessor) or a load-displacement curve (see GB/T
228.1), which can be drawn automatically or manually.
9.1.6 Test results and requirements for stress Rpf at specified plastic elongation of
0.2%
9.1.7 Test results and requirements for elongation at break A
The elongation at break A shall comply with the provisions of Table 7.
In case of dispute, the test method specified in 9.1.3 shall be used for testing.
9.2 Hardness test of bolts, screws and studs
9.2.1 General
9.2.2 Test procedure
The hardness test shall be carried out on fasteners that have passed the dimensional
inspection.
9.3 Proof load test of nuts
9.3.1 General
9.3.3 Test equipment
The tensile testing machine shall comply with GB/T 16825.1 Grade 1 or higher. Lateral
thrust on fasteners shall be avoided, for example, an automatic centering device may be
used.
9.3.4 Test equipment
The fixture and test mandrel shall comply with the following provisions.
9.3.5 Test procedure
A nut that has passed the size inspection shall be used for the proof load test.
The test mandrel thread shall be checked before each test. If the test mandrel thread is
damaged, it shall not be used within the damaged thread length, or replaced with a
qualified test mandrel.
9.3.6 Test results and requirements
The nut shall be able to withstand the proof load specified in Table 13 or Table 14,
without thread stripping or nut cracking.
9.4 Nut hardness test
9.4.1 General
This test is applicable to nuts that meet the following requirements.
9.4.2 Test procedure
9.4.2.1 General
The hardness test shall be carried out on nuts that have passed the size inspection.
The hardness test shall be in accordance with the provisions of GB/T 4340.1, GB/T
230.1 or GB/T 231.1.The minimum load for Vickers hardness test is 98 N. The load
for Brinell hardness test shall be equal to 30D2, in Newton (N).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 3098.24-2020 be delivered?Answer: The full copy PDF of English version of GB/T 3098.24-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 3098.24-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 3098.24-2020_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 3098.24-2020 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB/T 3098.24-2020?A step-by-step guide to download PDF of GB/T 3098.24-2020_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 3098.24-2020".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|