精品资料 ICS H 40 NATIONAL STANDARD OF PEOPLE’S REPUBLIC OF CHINA GB/T 3077-1999 Alloy structure steels Issued on 11/01/1999 Implemented on 08/01/2000 Issued by the National Quality & Technical Supervision Bureau NATIONAL STANDARD OF PEOPLE’S REPBLIC OF CHINA GB/T 3077-1999 Alloy structure steels instead of GB/T 3077-1988 1 SCOPE This standard defines size, shape, weight and allowable tolerance, technical requirement, test method, check and acceptance regulations, packing, mark and quality certificate etc. of hot-rolled and forged alloy structure steels. This standard is suitable for alloy structure steel bars with diameters or thickness not larger than 250 mm. Those steel bars with diameters or thickness larger than 250 mm can also be supplied after negotiation by both supplier and customer The chemical content of brands defined by this standard is also suitable for steel ingot, billet and their products. 2 APPLICABLE DOCUMENTS GB/T 222-1984 Sampling method for analysis of chemical content of steel and allowable tolerance of chemical content of end product GB/T 224-1984 Measuring method of depth of decarbonizing layer of steel GB/T 225-1988 Test method of quench of hardenability end of steel GB/T 226-1991 Acid-etching check method of low anization and defect of steel GB/T 228-1987 Test method of tension of metal GB/T 229-1994 Test method of Charpy shock of metal (U-shape notch) GB/T 231-1984 Test method of Brinell Hardness of metal GB/T 233-1982 Test method of upset forging of metal GB/T 702-1986 Size, shape, weight and allowable tolerance of hot-rolled round and square steel GB/T 908-1987 Size, shape, weight and allowable tolerance of forged round and square steel GB/T 1979-1980 Graded scheme of low anization and defects of structured steel GB/T 2101-1989 General stipulations for check and acceptance, packing, mark and quality certificate of profiled steel GB/T 2975-1998 Sampling location and sample making of m
