This Standard specifies the measurement principle, instrument requirements, test conditions, test procedures, and test report of the closed gas loop circulation method for measuring hydrogen content in liquid aluminum and aluminum alloys. This Standard applies to the determination of hydrogen content in liquid aluminum and aluminum alloys. 2 Measurement principle The closed gas loop circulation method uses a circulation system to promote the diffusion of hydrogen in the aluminum melt into a quantitative volume of inert gas, until the hydrogen partial pressure reaches equilibrium. It uses the thermal conductivity test principle to test the change in thermal conductivity of circulating gas due to hydrogen, and measure the partial pressure of hydrogen Pi. The calculation method of hydrogen content is as shown in formula (1): where: [H] - the hydrogen content, in cubic centimeter per 100 grams of aluminum (cm3/100 g Al); Pi - the hydrogen partial pressure, in kilopascal (kPa); K - the alloy correction coefficient, determined by referring to formula (2). The correction coefficient K of commonly used aluminum and aluminum alloys is shown in Table 1; S0 - the solubility of hydrogen in pure aluminum, which is a function of temperature, as shown in formula (3), in cubic centimeter per 100 grams of aluminum (cm3/100 g Al). YS/T 600-2009 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 8 where: Cu% - the percentage content of copper; Si% - the percentage content of silicon; Mg% - the percentage content of magnesium. where: T - the absolute temperature, in Kelvin (K). Table 1 No. Designation Correction coefficient YS/T 600-2009 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 8 Table 1 (continued) 3 Instrument requirements 3.1 Measurement principle: closed gas loop circulation method. 3.2 Measuring range: 0.01 cm3/100 g Al ~ 0.99 cm3/100 g Al. 3.3 Resolution: 0.001 cm3/100 g Al. 3.4 Accuracy: ¡À0.02 cm3/100 g Al (when the alloy correction...
This Part of this Standard specifies the file data format passed and exchanged between agency and switching center, including file naming and record format definition. This Part does not specify the file transmission method. The specific transmission method shall be confirmed by all parties involved in the transaction.
This Standard specifies the requirements for hardware, software and safety, application functions, transaction interface, transaction processing process, message format and voucher elements of POS terminal of specially engaged merchant.
This Standard specifies the form, formulation requirements, contents and markings, security warnings, standardized terms and signs, audio-visual signals, durability, etc. for the use instructions of mobile terminal products. This Standard is applicable to the mobile communication terminal products.
This Part of YS/T 710 specifies the determination method of calcium, cadmium, copper, iron, magnesium, manganese, nickel, lead, zinc content in cobalt oxide. This Part applies to the determination of calcium, cadmium, copper, iron, magnesium, manganese, nickel, lead, zinc content in cobalt oxide.
This Standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and contract (or order form) content of spodumene concentrate. This Standard is applicable to spodumene concentrate, which is obtained through various mineral processing methods and enrichment. The spodumene concentrate has been extensively applied to the glass and ceramic industry, and the production of various chemical products of lithium.
This part is used for reference when the national standards identically adopt international standards, or when other standards adopt international standards. The numbering method of national standards which identically adopt the ISO standards and/or IEC standards as specified in Chapter 7 of this part does not apply to standards issued by other international standardization bodies published by ISO.
This code is formulated in order to unify the technical requirements of railway engineering survey, and to ensure the quality of surveying and mapping achievements comply the requirements of each phase of survey, construction, and operation and maintenance.