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Technical parameters of notch bending test
High-quality profiles are profiles processed from high-quality steel. It is divided into hot-rolled (forged) high-quality profiles, cold-drawn (drawn) high-quality profiles and other varieties.
Hot rolled (forged) high-quality profiles include carbon structural steel, carbon tool steel, alloy structural steel, spring steel, stainless steel, bearing steel, alloy tool steel, die steel, high-speed tool steel and other varieties.
Cold drawn (dial) high-quality profiles include carbon structural steel, carbon tool steel, alloy structural steel, spring steel, stainless steel, bearing steel, alloy tool steel, high-speed tool steel, free-cutting steel, cold heading steel, S /5A and other varieties. S/5A is a product used to make shells and bullets.
Other varieties are mainly special high-quality profiles. Including hollow steel, oxygen cylinder material, cold heading steel, industrial pure iron, hot-rolled free-cutting steel, D60, S/5A, F18, F11, etc., the latter are all military materials.
High-quality section steel is not divided into large, medium and small, round steel and square steel are divided into groups according to specifications, such as 8-10mm, 11-15mm, 18-20mm, 205-245mm. Flat steel is divided into large, medium and small flat according to the cross-sectional area. Hexagonal steel has no grouping distance. However, the group pitch of high-quality section steel cannot replace the specific specifications, and the specific specifications should be filled in the documents. The specifications of high-quality profiles are simple, and most of them are round steel. In addition, there are square steel, flat steel, six-breast steel, hollow steel, special-shaped and so on.
The dimensional deviation of hot-rolled (forged) high-quality round steel, square steel, and hexagonal steel has two types: ordinary precision and higher precision. The cold-drawn profiles have more precise dimensions and smooth surfaces, and some surfaces need to be polished and polished. The polished or polished round steel with fine surface is called silver bright steel. High-quality profiles are rarely used, and most of them have to be further processed by the user and used after heat treatment. Therefore, in addition to ensuring the chemical composition, it is also necessary to ensure the mechanical properties after heat treatment.