ms-4515克莱斯勒标准.doc

DAIMLERCHRYSLER CORPORATION No: MS-4515Material Standard Date Published: 2003-05-27Category Code: X-1 Change: LEASL Req.: NoRESTRICTED: NoCARBON STEEL TAPPING SCREWS碳钢自攻螺钉1.0 GENERAL 总则 1.1 Purpose 目的This standard defines the requirements for conventional carbon steel tapping screws, which are heat treated by case hardening the entire surface of the screw. These fasteners differ from tip hardened tapping screws in which only the screw tip is case hardened.本标准定义了传统碳钢自攻螺钉的要求，螺钉的整个表面经表面硬化的热处理。这些紧固件和只是顶端表面淬硬的自攻螺钉不同。Conventional tapping screws are intended for general purpose applications such as fastening head liners, bezels, internal hardware, etc. The applications of these fasteners differ from tip hardened tapping screws which are intended for structural applications. The mechanical properties of conventional tapping screws will degrade if these fasteners are not properly protected and if they are used in a vehicle where they may be exposed to solutions used during manufacturing or if used where they may be exposed to water and salt. Tip hardened screws are more resistant to corrosive and embrittling solutions and are the preferred fastener for exterior applications.常规的自攻螺钉是用于普通的用途，比如夹紧head liners（？）, bezels（？）, 内部硬件等。这些紧固件的应用和顶端淬硬的应用于结构的自攻螺钉不同。如果没有完全被保护，如果它们在车里使用可能暴露于制造过程中使用的溶剂时 ，常规自攻螺钉的机械性能将降低。顶端淬硬的螺钉更能抵抗腐蚀和使之脆化的溶液，更适合于外部的使用。1.2 Coverage of this Standard 本标准的覆盖范围This standard covers the chemical composition, processing (forming, heat treating), mechanical properties and tests, surface conditions and quality requirements of the finished parts.本标准包括成品的化学成分，过程（成形，热处理），机械性能和测试，表面状况的质量要求。1.3 Limitations on Usage 使用的限制Fastener Engineering and Materials Engineering have developed a policy for tapping screw usage. When it is necessary to specify a tapping screw, MS-4515 shall be used for fasteners less than 6 mm in diameter and MS-8253, Induction Hardened Tip Tapping Screws, shall be used for fasteners 6 mm and larger. If it is not possible to induction harden a tapping screw 6 mm in diameter or larger, it is strongly advised that an alternate joining technique be selected. Case hardened tapping screws should not be selected for any structural applications, those applications where the fastener sees high stress or adverse environments such as salt water.紧固件工程和材料工程发展了自攻螺钉使用的发展方针。当指定自攻螺钉是必需的时，MS-4515应被使用在直径小于6mm的紧固件上。MS-8253，包括顶端淬硬的紧固件，应被使用在直径6mm或更大的紧固件上。如果直径6mm的自攻螺钉感应淬火不可能时，强烈建议使用一种代用的连接技术。表面淬火自攻螺钉不应用在任何那些紧固件受高应力，或诸如盐水的不利环境的结构的用途，。1.4 Correlation to other Standards 与其他标准的关系This standard, in part, is similar to SAE J933 and ISO 2702 with regards to microstructure and total case depth.本标准在关于显微结构和整个渗碳层深度方面与SAE J933 和 ISO 2702部分相似。1.5 Location of Definitions/Abbreviations/Acronyms 定义的位置/缩写/只取首个字母的缩写。Definitions/Abbreviations/Acronyms can be found in Section 8.0 toward the end of this standard.定义/缩写/只取首个字母的缩写可以在本标准的末尾的8.0节中找到。 2.0 MATERIAL CHARACTERISTICS 材料特性The steel used to fabricate the fasteners shall be made from a cold heading quality, killed steel wire in accordance to approved commercial practices. It shall be uniform in chemistry and quality; clean, sound, and free from all surface and internal defects detrimental to the fabrication, performance or appearance of the parts for which it is intended.用来制造这些紧固件的钢材应按照批准的商业要求选用冷镦质量的镇静圆钢。它们必须有一致的化学成分和质量，干净，坚固，没有对零件的制造，性能，外观有害的所有表面和内部缺陷3.0 CHEMICAL COMPOSITION 化学成分The chemical composition shall conform to Table 1.化学成分应符合表1的规范TABLE 1: CHEMICAL COMPOSITION表1：化学成分Screw Size 螺钉尺寸Chemical Composition (Wt. %) 化学成分in. mm CarbonManganese No. 4 and smaller 2.8 mm and smaller 0.13-0.25 0.60-1.65 Greater than No. 4 Greater than 2.8 mm 0.15-0.25 0.70-1.65 Boron intensified (0.0005 - 0.003%) low carbon steel is a permissible option. For conventionally hardened double lead spaced thread tapping screws, boron intensified low carbon (0.08% minimum carbon) steel is a permissible option.硼强化低碳钢(0.0005 - 0.003%)是可允许选用的。对于常规的淬硬的双头带垫圈的自攻螺钉，硼强化钢(最低碳含量0.08%)是允许选用的。Heat (ladle) chemistry is subject to product or check analysis as specified in ASTM A29 or SAE J409 standards of the latest issue.热（钢包）化学是服从于产品的，或按ASTM A29以及SAE J409最新版本检查分析。Check analysis on finish parts necessitates determinations be made on uncased or core potions of the screw.成品零件的检查分析需要在没有表面淬火的部分或芯部进行4.0 PROCESS REQUIREMENTS 过程要求4.1 Heat Treatment 热处理Tapping screws shall be heat treated according to the processing requirements outlined in either PS-2 or PS-8.自攻螺钉应按照PS-2 或 PS-8指导的过程要求来进行热处理。NOTE: To aid the further cleaning and electroplating of these fasteners, it is recommended that the fastener manufacturer minimize the amount of dirt or excessive lubricant left on the fasteners on shipping to the heat treater. The dirt and lubricant will burn on to the fastener during heat treating which then may require aggressive acid cleaning for their removal. Acid cleaning can lead to hydrogen embrittlement. Fasteners which are covered with an excessive amount of oil, chips, die lubricants, etc., should be washed by the fastener manufacturer with appropriate cleaners prior to shipping to the heat treater. The heat treat supplier should also wash the parts to remove any residual light oils, rust inhibitors, etc., prior to placing the fasteners into the furnace. It is recommended that, if possible, the fasteners be heat treated by tempering in nitrogen to reduce heat treat scale formation which would aid in minimizing the amount of acid cleaning.注：为了有助于这些紧固件的清洗和电镀，推荐紧固件制造商在送到热处理商以前将紧固件上的污垢和过量的润滑剂减到最少。污垢和润滑剂会在热处理时“燃烧”，随后就会要腐蚀性的酸来清洗、去除。酸洗可能导致氢脆。对带有过多的油，切屑，模具润滑剂等的紧固件应在运送到热处理商之前由紧固件厂用恰当的清洗剂清洗。热处理商业应在紧固件放到炉内前清洗零件以去除任何残留的油，防锈剂等等。如果可能的话，推荐热处理的紧固件在氮气中回火来减少结垢，这可以有助于减少酸洗的总量。4.2 Tempering 回火After quenching the tapping screws shall be tempered by reheating to 345 degrees C (650 degrees F) minimum.在自攻螺钉淬火后应回火，再加热的温度为最低345摄氏度（650华氏度）。4.3 Surface Treatments 表面处理 Fasteners that are surface treated to improve their cleanliness, appearance or corrosion resistance may become hydrogen embrittled when exposed to the chemicals and coating methods used in processing. Consequently, it is required that carbon steel tapping screws, if surface treated, be hydrogen relieved according to the procedures described in PS-9500.紧固件为提高清洁度，外观或耐腐蚀性而进行表面处理，当暴露于化学品和在处理中用到涂覆方法时会产生氢脆。因此，如果有表面处理的话，要求碳钢自攻螺钉按PS-9500S的程序去氢脆处理5.0 PERFORMANCE REQUIREMENTS OF THE MATERIAL 材料的性能要求Tapping screws shall meet the drive test and torsional strength requirements of the Tapping Screw Performance and Testing section of the Tapping Screw General Specifications in the Chrysler Standard Parts Book.自攻螺钉应符合克莱斯勒标准零件手册自攻螺钉的一般说明的“自攻螺钉性能和测试”一节关于驱动测试和抗扭强度要求，5.1 Mechanical Properties and Tests 机械性能和测试5.1.1 Surface Hardness After Tempering 回火后的表面硬度The surface hardness after tempering shall be the equivalent of 45 HRC minimum. For routine quality control measurements, the surface hardness may be measured using HR15N, knoop, or pyramid indentors. For referee measurements, a knoop or pyramid indentor with a 500 g load shall be used at a depth of 0.05 mm (0.002 inches) below the surface of the fastener.回火后的表面硬度最小应等于45HRC。为了满足日常质量控制的测量要求，可以用HR15N，奴普显微压痕硬度测量仪，或棱锥形压头测量表面硬度，作为参考测量，一个500g负载的奴普显微压痕硬度测量仪或棱锥形压头须在紧固件表面以下0.05mm(0.002英寸)使用。5.1.2 Core Hardness After Tempering 回火后的心部硬度The core hardness after tempering shall be 28 to 36 HRC measured at the mid-radius of a transverse section at a distance sufficiently behind the point of the screw to be through the full minor diameter of the fastener.回火后的心部硬度应为28或36HRC，它的测试位置应在横截面的半径的中部，这个位置充分远离了紧固件贯穿完整螺纹小径的地方5.2 Physical Properties and Tests 物理属性和测试5.2.1 Microstructure 显微结构The microstructure of the fastener shall show no band of free ferrite between the case and core upon metallographic examination. The case and core structures shall consist of tempered martensite.紧固件的显微结构在金相检验中应显示外部和心部的无自由铁素体夹层。外部和心部结构应由回火马氏体组成。5.2.2 Total Case Depth 总的渗碳层深度The total case depth shall conform to the Table 2. Case depth is measured normal to the surface at the thread flank at a point midway between the crest and root. The recommended technique for measuring case depth is described in the appendix of SAE J78.总的渗碳层深度应符合表2。渗碳深度正规的是在螺牙侧面牙顶和牙根的中间表面上测得的。推荐的测量渗碳层深度的技术在SAE J78的附录中有描述。TABLE 2: TOTAL CASE DEPTH 表：总的渗碳层深度SCREW SIZE 螺钉尺寸CASE DEPTH渗碳层深度inch Mm inch Mm No. 4 through No. 6 incl. Up to 4.2 0.002 to 0.007 0.051 to 0.178 No. 8 through No. 12 incl. 4.2 through 5.5 incl. 0.004 to 0.009 0.102 to 0.229 Larger than No. 12 Larger than 5.5 0.005 to 0.011 0.127 to 0.279 6.0 QUALITY质量Quality requirements are covered in CS-9801 under FASTENER MATERIAL STANDARDS.质量要求在CS-9801紧固件材料标准中。6.1 QS-9000QS-9000 defines the quality system expectations of Chrysler, Ford, General Motors, Truck Manufacturers and other subscribing companies for internal and external suppliers of production and service parts and materials. It is mandatory that the requirements of QS-9000 be met when supplying parts to this standard.QS-9000定义的是克莱斯勒，福特，通用，卡车制造厂和其他认购公司对内部或外部的产品，配件和材料的供应商的质量系统要求，按本标准提供零件时QS-9000的要求是强制要求执行的。7.0 CONTROL 控制The minimum metallurgical and plating/coating checking requirements are described in PS-10029. The minimum heat treat metallurgical checking requirements are described in PS-10030.最低的冶金和涂覆检查要求在过程标准PS-10029中有描述最低的热处理冶金的检查要求在过程标准PS-10030中有描述8.0 DEFINITIONS/ABBREVIATIONS/ACRONYMS 定义/缩写/只取首字缩写Tapping Screw. A screw that forms or cuts threads into the mating material as it is driven into the joint.自攻螺钉，当它拧入结合体时，螺纹是挤压或切削相配合的材料的。Case Hardening. A heat treatment process that creates a chemical composition gradient at the surface of the fastener which in turn creates a hardness gradient.渗碳淬火，在紧固件表面创造化学成分梯度从而产生硬度梯度的热处理过程。Total Case Depth. The depth of penetration of the chemical gradient created during case hardening.总的渗碳层深度，在渗碳淬火中产生的化学梯度的渗透深度。Hydrogen Embrittlement. A delayed failure mechanism in which the strength and/or ductility of thematerial is reduced due to the interaction with hydrogen.氢脆化，由于氢的交互作用产生的材料的强度和/或延伸性降低的滞后破坏机理。9.0 GENERAL INFORMATION 总则Three asterisks “*” after the section/paragraph header denotes multiple technical changes to thesection/paragraph. A triple asterisk before and after a string of text (*text*) identifies a single change.在节/段的头部的后面跟三颗星“*”表示该节/段有多重更改，在一窜字符的前后各三颗星（*text*）表示有单一的更改Certain important information relative to this standard has been included in separate standards. To assure the materials submitted meet all of DaimlerChrysler requirements, it is mandatory that the requirements in the following standards be met某些和本标准相关的信息包含于独立的标准中，为了保证材料能满足所有克莱斯勒要求，强制要求下列标准必须满足CS-9800 - Application of this standard, the subscription service, and approved sourcesCS-9003 - Regulated substances and recyclabilityCS-9800-标准的应用，预约的服务和认可的供应商CS-9003-控制的材料和可循环利用Within Engineering Standards, the Regulatory (Government-mandated) requirements are designated by , and which correspond to Safety, Emission and Homologation Shields respectively. Th