GB/T 8731-1988 Translated English of Chinese Standard. (GBT 8731-1988, GB/T8731-1988, GBT8731-1988): Free-cutting steel - Technical requirements [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]This Standard applies to hot-rolled and cold-drawn steel bars and steel wires which are used in the cutting of ordinary machine tools and automatic machine tools. Its chemical composition also applies to ingots, billets and their products. |
Common terms and phrases
accordance with Table accuracy and appearance allowable deviation bars and steel bars and wire Batch rules Brinell hardness HB buyer calcium certificate of steel chemical composition clipping machine cold-drawn status cold-drawn steel bars Decarburized layer delivered in hot-rolled Delivery status depth Different steel bars exceed half Grade 11 grade GB greater hair lines half the tolerance hardness of steel heat treatment high-temperature tempered hot-rolled or cold-drawn Inspection and acceptance Inspection item less than Brinell machine tools Macro-structure marking and quality Mechanical property Tensile meet the requirements N/mm2 Elongation Non-metallic inclusions packaging porosity properties and Brinell property Tensile strength provisions of GB quality certificate re-inspection and determination requirements of Table rolled steel bars rules of steel sample blank Sample diameter Sampling quantity shear deformation Shrinkage silver steel status shall meet steel shall meet steel wires supplier surface of hot surface of steel Test method wire rods wires shall comply