ASTM A29/A29M-23由美国材料与试验协会 US-ASTM 发布于 2023-07-01。
ASTM A29/A29M-23在国际标准分类中归属于: 77.140.60 钢棒和条钢。
ASTM A29/A29M-23 热锻碳钢和合金钢的一般要求标准规范的最新版本是哪一版?
最新版本是 ASTM A29/A29M-23 。
1.1 This specification2 covers a group of common requirements which, unless otherwise specified in the purchase order or in an individual specification, shall apply to carbon and alloy steel bars under each of the following ASTM specifications (or under any other ASTM specification which invokes this specification or portions thereof): Title of Specification ASTM DesignationA Hot-Rolled Carbon Steel Bars: Steel Bars, Carbon, Quenched and Tempered A321 Steel Bars and Shapes, Carbon Rolled from “T’’ Rails A499 Steel Bars, Carbon, Merchant Quality, M-Grades A575 Steel Bars, Carbon, Hot-Wrought, Special Quality A576 Steel Bars, Carbon, Merchant Quality, Mechanical Properties A663/A663M Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Properties A675/A675M Carbon and Alloy Steel Bars for Springs A689 Cold-Finished Carbon Steel Bars: Steel Bar, Carbon and Alloy, Cold-Finished A108 Cold-Drawn Stress-Relieved Carbon Steel Bars Subject to Mechanical Property Requirements A311/A311M Hot-Rolled Alloy Steel Bars: Steel Bars, Alloy, Standard Grades A322 Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements A304 Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered A434/A434M Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or Pressure-Containing Parts, or Both A739 Cold-Finished Alloy Steel Bars: Steel Bars, Alloy, Hot-Rolled or Cold-Finished, Quenched and Tempered A434/A434M Steel Bars, Carbon, Hot-Wrought or Cold-Finished, Special Quality, for Pressure Piping Components A696 A These designations refer to the latest issue of the respective specifications, which appear either in the Annual Book of ASTM Standards, Vol 01.05, or as reprints obtainable from ASTM. 1.2 In case of any conflict in requirements, the requirements of the purchase order, the individual material specification, and this general specification shall prevail in the sequence named. 1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall used independently of the other, and values from the two systems shall not be combined. 1.4 For purposes of determining conformance to this specification and the various material specifications referenced in 1.1, dimensional values shall be rounded to the nearest unit in the right-hand place of figures used in expressing the limiting values in accordance with the rounding method of Practice E29. NOTE 1—Specification A29/A29M previously listed dimensional tolerances for cold-finished bars; these are now found in Specification A108. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
钢的种类很多,按有没有加入碳以外其他元素,可分为碳素钢和合金钢两大类,按含碳量多少又可分为低碳钢(C0.6%)三类。碳素钢没有为改善性能而加入碳以外其他元素的钢称为碳素钢。碳素钢的力学性能能满足许多设备的结构件和机械零件的要求,也能满足部分工具钢的要求,有优良的工艺性和价格较低等优点,在汽车行业及其他行业中得到广泛应用。合金钢在碳钢中加入一种或多种适量合金元素,以改善钢的某种性能,称为合金钢。...
不完全退火主要适用于中、高碳钢和低合金钢锻轧件等,其目的是细化组织和降低硬度,加热温度为Ac1+(40~60)℃,保温后缓慢冷却。4、什么是等温退火等温退火是将钢件或毛坯件加热到高于Ac3(或Ac1)温度,保持适当时间后,较快地冷却到珠光体温度区间地某一温度并等温保持,使奥氏体转变为珠光体型组织,然后在空气中冷却的退火工艺。等温退火工艺应用于中碳合金钢和低合金钢,其目的是细化组织和降低硬度。...
碳钢简介碳素钢是近代工业中使用最早、用量最大的基本材料。世界各工业国家,在努力增加低合金高强度钢和合金钢产量的同时,也非常注意改进碳素钢质量,扩大品种和使用范围。目前碳素钢的产量在各国钢产总量中的比重,约保持在80%左右,它不仅仅广泛应用于建筑、桥梁、铁道、车辆、船舶和各种机械制造工业,而且在近代的石油化学工业、海洋开发等方面,也得到大量使用。...
另外,对厚度较大的高碳钢模具,也可适当提高其淬火温度来防止产生淬火裂纹。对易变形、开裂的模具,在淬火前还应先进行去应力退火。(2)合理进行加热应尽量做到均匀加热,减少加热时的热应力。对于大截面、形状复杂、变形要求高的高合金钢模具,一般都应经过预热或限制加热速度。(3)正确选择冷却方式和冷却介质尽可能选用预冷淬火、分级淬火和分级冷却方式。...
Copyright ©2007-2022 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证:京ICP证110310号