GB/T 3098.24-2020 PDF EnglishUS$680.00 · In stock · Download in 9 seconds
GB/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 procedure Status: Valid
Similar standardsGB/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 ContentsForeword... 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... 661 ScopeThis 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 referencesThe 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 shafts3 Terms and definitionsThe 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 CodesThe 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 systemAll stainless steels and nickel alloys specified in this Part belong to three different categories.6 Materials and processing6.1 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 properties7.1 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 inspections8.1 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 conditions9.1 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. 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