tailieunhanh - Steel Heat Treatment - Metallurgy and Technologies 2nd ed - G. Totten (CRC_ 2010) WW Part 2

Tham khảo tài liệu 'steel heat treatment - metallurgy and technologies 2nd ed - g. totten (crc_ 2010) ww part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | composition requirements such as boron lead or nonstandard chemical ranges. Table and Table list the UNS numbers corresponding to SAE-AISI numbers for various standard carbon and alloy steels respectively with composition ranges. SPECIFICATIONS FOR STEELS A specification is typically an acronym or abbreviation for a standards organization plus a specific written statement of both technical and commercial requirements that a product must satisfy. It is a document that restrains or controls procurement and is issued by that standards organization. All material specifications contain general and specific information 57 . Any reasonably adequate specification will furnish the information about the items stated below 6 8 . The scope of the document may include product classification required size range condition and any comments on product processing considered helpful to either the supplier or the user. An informative title and a statement of the required form may be employed instead of a scope item. Chemical composition may be described or it may be denoted by a well-known designation based on chemical composition. The SAE-AISI designations are normally used. A quality statement covering any appropriate quality descriptor and whatever additional prerequisites might be necessary. It may also include the type of steel and the steelmaking processes allowed. Quantitative requirements recognize permissible composition ranges and all physical and mechanical properties necessary to characterize the material. Testing methods employed to check these properties should also be included or reference made to standard test methods. This section should only address those properties that are vital for the intended application. Additional requirements can cover surface preparation special tolerances and edge finish on flat-rolled products as well as special packaging identification and loading instructions. Engineering societies trade associations and institutes whose .