【英文标准名称】:Explosiveatmospheres-Part30-1:Electricalresistancetraceheating-Generalandtestingrequirements(IEC60079-30-1:2007);GermanversionEN60079-30-1:2007
【原文标准名称】:爆炸性环境.第30-1部分:电阻式伴热器.一般和测试要求
【标准号】:EN60079-30-1-2007
【标准状态】:现行
【国别】:
【发布日期】:2007-12
【实施或试行日期】:2007-12-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:补偿加热;大气;定义;热电对流供暖;电气工程;电阻;电驱动装置;防爆;爆炸安全;爆炸性的;爆炸性环境;加热条;易燃性;可燃性环境;气爆;加热设备;耐水解;冲击测试;作标记;防护电气设备;合格试验;规范(验收);表面加热系统;测试;测试要求;伴热系统
【英文主题词】:Additionalheating;Atmosphere;Definition;Definitions;Electricspaceheating;Electricalengineering;Electricalresistance;Electrically-operateddevices;Explosionprotection;Explosionsecurity;Explosive;Explosiveatmospheres;Firebars;Flammability;Flammableatmospheres;Gasexplosion;Heatingequipment;Hydrolyticresistance;Impacttesting;Marking;Protectedelectricalequipment;Qualificationtests;Specification(approval);Surfaceheatingsystems;Testing;Testingrequirements;Traceheatingsystems
【摘要】:
【中国标准分类号】:K35
【国际标准分类号】:29_260_20
【页数】:30P.;A4
【正文语种】:英语


Product Code:SAE J406
Title:Methods of Determining Hardenability of Steels
Issuing Committee:Carbon And Alloy Steels Committee
Scope:This SAE Standard prescribes the procedure for making hardenability tests and recording results on shallow and medium hardening steels, but not deep hardening steels that will normally air harden.Included are procedures using the 25 mm (1 in) standard hardenability end-quench specimen for both medium and shallow hardening steels and subsize method for bars less than 32 mm (1-1/4 in) in diameter. Methods for determining case hardenability of carburized steels are given in SAE J1975.Any hardenability test made under other conditions than those given in this document will not be deemed standard and will be subject to agreement between supplier and user. Whenever check tests are made, all laboratories concerned must arrange to use the same alternate procedure with reference to test specimen and method of grinding for hardness testing.For routine testing of the hardenability of successive heats of steel required to have hardenability within certain limits, it is sufficient to designate hardenability simply in terms of distance from the quenched end to the point at which a certain hardness is obtained. This designation may also be adequate for comparing steels of different compositions to see whether they have similar hardenability.Hardenability limits for specifying steel in this manner are obtained by measuring the hardenability of a steel which has proved satisfactory for the use intended. The hardenability test may be used in this way as an empirical test.For new components where manufacturing experience is lacking, hardenability data may be effectively used to estimate the hardness profile provided by any given steel. Attendantly, the ability to predict hardenability from chemical composition has become increasingly important when comparing various steel grades or developing new steels for specific applications. One such procedure is described in Appendix A. Other hardenability prediction methods are available from the selected references in Section 2. However, it should be emphasized that the use of any hardenability prediction procedure does not preclude the importance of conducting Jominy end-quench tests to determine the actual hardenability of any specific grade of steel.Hardenability data may be used to estimate hardnesses obtainable with any steel in new machine parts not yet in production and not similar to any parts on which production experience is available. Various hardenability application methods are described in the selected references, Section 2.1, 23 to 25. It appears none of these methods are precise, but these are often useful for estimation purposes. Final correlation on actual parts is necessary.