GBT 3077-1999 合金结构钢

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 power organization 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 power organization 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 mechanics feature test of steels and steel product
GB/T 4336-1984 Photoelectric emission spectrum analysis method of carbon steel and middle and low alloy steel
GB/T 6397-1986 Test sample of tension of metal
GB/T 7736-1987 Supersonic check and acceptance method of low power organization and defects of steel
GB/T 10561-1989 Microscopic appraisal method of non-metal inclusion in steels
GB/T 13299-1991 Microscopic organization appraisal method of steel
GB/T 15711-1995 Acid-etching check and acceptance method of tower hair crack of steels
GB/T 17505-1998 General technical conditions of delivery of steel and steel product
GB/T 17616-1998 Unified digit code of brands of steel iron and alloy products
YB/T 5148-1993 Measuring method of average grain-size of metalCited standards of chemical analysis method of various elements in steel are shown on Appendix A (Appendix of Standard)