GB/T 3098.17-2000

📋 Scope / 适用范围 ai_extracted

This standard specifies the preload test method for inspecting hydrogen embrittlement of fasteners at room temperature. This standard applies to: a) Bolts, screws, and studs; b) Self-extruding screws; c) Self-tapping screws; d) Self-drilling self-tapping screws; e) Nuts; f) Washers. These fasteners are all made of steel and are subjected to tensile stress. The temperature range for this test is 10°C to 35°C. This test is only applicable to process control and may be conducted after any manufacturing operation, but it is not intended as an acceptance test. This test can evaluate differences and variations in process status and technical status, and determine the different effects of various processes, including pre-plating treatments and post-plating treatments (baking) to reduce free hydrogen in fasteners. Manufacturing and process personnel are not relieved of their responsibility for adopting and monitoring process control due to this test. Note: If the test is conducted more than 24 hours after the final manufacturing operation, the probability of detecting hydrogen embrittlement is significantly reduced. Therefore, under normal circumstances, this test is not suitable for acceptance testing. Special attention should be given to the reference comparative test specified in Clause 7.3.

📝 Foreword / 前言 ai_extracted

**GB/T 3098.17-2000** **This standard is equivalent to the international standard ISO 15330:1999 *Fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing surface method*.** The general title of GB/T 3098 is "Mechanical properties of fasteners", which includes the following parts: - GB/T 3098.1-2000 Mechanical properties of fasteners — Bolts, screws and studs - GB/T 3098.2-2000 Mechanical properties of fasteners — Nuts — Coarse thread - GB/T 3098.3-2000 Mechanical properties of fasteners — Set screws - GB/T 3098.4-2000 Mechanical properties of fasteners — Nuts — Fine pitch thread - GB/T 3098.5-2000 Mechanical properties of fasteners — Self-tapping screws - GB/T 3098.6-2000 Mechanical properties of fasteners — Stainless steel bolts, screws and studs - GB/T 3098.7-2000 Mechanical properties of fasteners — Self-drilling screws - GB/T 3098.8-1992 Mechanical properties of fasteners — Threaded joints for heat resistance - GB/T 3098.9-1993 Mechanical properties of fasteners — Prevailing torque type steel hexagon lock nuts - GB/T 3098.10-1993 Mechanical properties of fasteners — Bolts, screws, studs and nuts made of non-ferrous metals - GB/T 3098.11-1995 Mechanical properties of fasteners — Self-drilling self-tapping screws - GB/T 3098.12-1996 Mechanical properties of fasteners — Cone proof load test for nuts - GB/T 3098.13-1996 Mechanical properties of fasteners — Torsion test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm - GB/T 3098.14-2000 Mechanical properties of fasteners — Nut expansion test - GB/T 3098.15-2000 Mechanical properties of fasteners — Stainless steel nuts - GB/T 3098.16-2000 Mechanical properties of fasteners — Stainless steel set screws - GB/T 3098.17-2000 Mechanical properties of fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing surface method This standard was proposed by the State Bureau of Machinery Industry. This standard is under the jurisdiction of the National Technical Committee on Fasteners Standardization. This standard was drafted by the Machinery Science Research Institute, with participation from the China Aerospace Standardization Institute, Shanghai Fastener and Welding Material Technology Research Institute, and Wuhan Automobile Standard Parts Research Institute. This standard is interpreted by the Secretariat of the National Technical Committee on Fasteners Standardization. **GB/T 3098.17-2000** **ISO Foreword** ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote. International Standard ISO 15330 was prepared by ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners. **ISO Introduction** When hydrogen atoms enter the steel matrix, under the action of stress (likely below the yield strength of the material, even within the normal design strength), they can cause a reduction in toughness or load-bearing capacity, leading to fracture (usually sub-microscopic fracture) or sudden brittle failure. In alloys exhibiting this phenomenon, the reduction in toughness cannot be detected by conventional tensile tests. This phenomenon is often referred to as hydrogen-induced delayed brittle failure, hydrogen stress cracking, or hydrogen embrittlement. Hydrogen can be generated during processes such as heat treatment, gas carburizing, cleaning, pickling, phosphating, electroplating, and cathodic protection (corrosion prevention) measures in the working environment. It can also be produced during manufacturing processes such as roll forming, machining, drilling that requires coolant or lubricant but is interrupted, as well as during welding or brazing processes. **National Standard of the People's Republic of China**

📚 References & Relations / 引用与关联

📖 Terms & Definitions / 术语和定义 ai_extracted

氢脆倾向

如果紧固件由对氢脆敏感的钢制成，并已吸收了氢，则其破坏倾向就会增大。 注:如果在相应的工序中提供的氢达到最低程度，并(或)在镀后进行了适当的热处理(烘烤)，使氢从钢中释放出 来，且不再逆向地再将氢吸人钢中，则氢脆倾向会减小 13 生产批 同一标记(包括产品等级、性能等级和规格)的，用同一炉的棒材、线材、丝材或板材制造的，在整个 连续周期内采用相同或类似工艺并经过相同的热处理和(或)涂覆工艺的紧固件的数量 相同的热处理或涂覆工艺:对连续生产，即表示采用相同的处理循环而无任何改动;对非连续生产， 即表示对相同、相邻的制造批采用相同的处理循环。 注:从技术角度考虑，一个生产批可分成若干个制造批，然后再合并成同一个生产批 I刁制造批 同时在一起制造的属于同一生产批的紧固件的数量

If fasteners are made of steel sensitive to hydrogen embrittlement and have absorbed hydrogen, their tendency to fail increases. Note: The tendency for hydrogen embrittlement can be reduced if the hydrogen introduced during the corresponding processes is minimized and/or appropriate post-plating heat treatment (baking) is performed to release hydrogen from the steel, provided that hydrogen is not subsequently reabsorbed into the steel in a reverse manner. 13 Production lot The quantity of fasteners with the same designation (including product grade, property class, and specification), manufactured from the same heat of bars, wires, rods, or sheets, using identical or similar processes throughout a continuous cycle, and subjected to the same heat treatment and/or coating process. Identical heat treatment or coating process: For continuous production, this means using the same treatment cycle without any modifications; for non-continuous production, this means using the same treatment cycle for identical or adjacent manufacturing lots. Note: From a technical perspective, a production lot may be divided into several manufacturing lots and subsequently recombined into the same production lot. 14 Manufacturing lot The quantity of fasteners belonging to the same production lot that are manufactured together simultaneously.

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