Gb T 221 2008 Translated English Of Chinese Standard Gbt 221 2008 Gb T221 2008 Gbt221 2008

This Standard specifies notations for designations of iron and steel. It is applicable to the preparation of designations for pig iron, carbon structural steels, low-alloy structure steel, quality carbon structural steel, free-cutting steel etc.

This standard specifies general specifications for acceptance, packaging, marking and certification for section steel (steel bar and rod). This Standard is applicable to hot rolling, cold drawing (rolling), forging and heat treating section steel.

This Standard specifies the method principle, apparatus, sampling and sample preparation, test procedures, results calculation and precision etc. of the coke with particle size greater than 60mm and 25mm. This Standard is applicable to the determination of mechanical strength of coke with particle size no less than 25mm. The coke with particle size less than 25mm can also refer to this Standard.

This Part of GB/T 19363.1 specifies the translation services - translation services specifications. This Part is applicable to translation services.

This standard specifies the requirements, test methods, inspection rules, packaging, marking, transportation and storage of light rare earth carbonate. This standard is applicable to light rare earth carbonates prepared by chemical methods using the light-rare-earth-based rare earth minerals as raw materials. It is mainly used as a raw material for separating a single rare earth product, preparing a rare earth polishing powder, or as a raw material for producing mixed rare earth oxide for electrolysis purposes.

This Standard stipulates the basic requirements for the type and size, profile size and deviation, technical requirements, marking and packaging of thread rolling flat dies for general purpose metric screw threads. This Standard applies to thread rolling flat dies for processing general purpose metric screw threads (GB/T 192~193, GB/T 196~197). Thread rolling flat dies are divided into three precision grades: grade 1, grade 2 and grade 3. Grade 1 applies to the processing of external threads with tolerance grades 4 and 5; grade 2 applies to the processing of external threads with tolerance grades 5 and 6; grade 3 applies to the processing of external threads with tolerance grades 6 and 7.

This standard specifies the product classification, technical requirements, test methods, inspection rules and markings, packaging and storage of pressure type SF6 gas density monitor. This standard is applicable to pressure type SF6 gas density monitor that use spring tubes as measuring elements, temperature compensation devices, and has the indicating and controlling the on/off function of electrical signals.

This Standard specifies the technical requirements, test methods, as well as packaging, marking, storage, safety warning of pure nitrogen, high purity nitrogen and ultra pure nitrogen products. This Standard applies to gaseous or liquid pure nitrogen, high purity nitrogen and ultra-pure nitrogen obtained from air separation or purification. They are mainly used as the protective gas, replacement gas, reaction gas, etc. Molecular formula: N2. Relative molecular mass: 28.1034 (according to relative atomic mass in 2005).