TAILIEUCHUNG - INSPECTION, EVALUATION AND REPAIR OF HYDRAULIC STEEL STRUCTURES Episode 11

Tham khảo tài liệu 'inspection, evaluation and repair of hydraulic steel structures episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | EM 1110-2-6054 1 Dec 01 3 In 1964 a new specification ASTM A502 was published for steel structural rivets and superseded ASTM A141 and A195. The later version of this specification ASTM A502 covers three grades of steel rivets general-purpose carbon steel rivets carbon-manganese steel rivets for use with high-strength carbon and high-strength low-alloy steels and rivets comparable to ASTM A588 weathering steel. The later specification includes hardness requirements but not tensile and yield strength requirements. c. Allowable and yield stresses. During the same period that A7 steel was evolving the American Institute of Steel Construction AISC changed their basic allowable working stress for structural steel only once raising it in 1936 from 124 to 138 MPa 18 to 20 ksi Ferris 1953 . The ASTM requirement for minimum yield point during this period was generally one-half times the tensile strength or not less than 207 MPa 30 ksi in 1933 the minimum of 207 MPa 30 ksi was raised to MPa 33 ksi for plate and shape products. When A373 steel was introduced that steel had a minimum yield point MPa 32 ksi suggesting that to improve weldability at that time some sacrifice in strength was necessary. Only when A3 6 steel was introduced in 1960 in a tentative specification ASTM A36-60T did the minimum yield point for structural steel plates and shapes increase to 248 MPa 36 ksi . By that time weldability and welding practices for structural steel had markedly improved and standardized. d. Weldability of earlier steels. 1 A very good reference that discusses the weldability of steels including steels that have limited weldability is the monograph Weldability of Steels published by the Welding Research Council Stout et al. 1987 . Now in its fourth edition the monograph has chapters on the properties of steel related to weldability factors affecting weldability in fabrication and the weldability of different steels. 2 For early steels reference can be made to the first

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