Samples were taken for quality control in production.
Bar refers to the product section shape is round, square, flat, hexagonal, octagonal, and other simple section of steel, and delivered in straight bars.
The material used for further processing is the raw material, which can be the product of other processing processes, or the product of natural growth or natural formation in nature.
Square steel: It is solid, bar stock. Distinguished from the square tube, hollow, which is a pipe.
Steel billets are the product of the casting of the steel made in the steelmaking furnace.
Profiles are objects with a certain geometry made of iron or steel and materials with a certain strength and toughness (such as plastic, aluminum, fiberglass, etc.) through the process of rolling, extrusion, casting, etc.
The steel is injected into the casting mold by the steel ladle to solidify into an ingot. After the steel is smelted in the furnace, it must be cast into a certain shape of ingot or billet in order to be processed. The process of casting into ingots with the mold is referred to as ingot casting.
The rough is the raw material that has not yet been processed, and can also refer to the part of the finished product before it is completed.
Cast steel is the steel dedicated to the manufacture of steel castings. When the strength of the casting requirements is high, cast steel should be used when the cast iron can not meet the requirements.
10.Nodular Cast Iron:
Ductile iron is a high-strength cast iron material developed in the 1950s, and its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some parts with complex forces and high requirements for strength, toughness, and wear resistance.
Bronze is the earliest alloy in the history of metal smelting and casting. An alloy of tin or lead added to pure copper (purplish copper) has special importance and historical significance. Compared with pure copper (purplish copper), bronze is strong and has a low melting point (25% tin smelting bronze lowers the melting point to 800°C.). The melting point of pure copper (purplish copper) is 1083°C). Bronze has good castability, wear resistance, and chemical stability.
Brass is an alloy composed of copper and zinc. Brass composed of copper and zinc is called ordinary brass, and if it is a variety of alloys composed of two or more elements, it is called special brass. Brass has strong wear resistance, brass is often used in the manufacture of valves, water pipes, air conditioning inside and outside the machine connection pipe, and radiator.
Alloy is a solid product with metallic properties obtained by mixing and melting one metal with another metal or several metals or non-metals and then cooling and solidifying.
Stainless steel is short for stainless acid-resistant steel, resistant to air, steam, water and other weak corrosive media or stainless steel called stainless steel; and will be resistant to chemically corrosive media (acid, alkali, salt, and another chemical leaching) corrosion of steel called acid-resistant steel.
The reduction in the carbon content of steel is called decarburization.
The oxide is a corrosion product formed by the oxidation of steel at high temperatures and consists of ferrous oxide, ferric oxide, and ferric trioxide.
Annealing is a metal heat treatment process that refers to slowly heating the metal to a certain temperature, maintaining it for a sufficient time, and then cooling it at a suitable rate. The purpose is to reduce hardness, improve machinability; reduce residual stress, stabilize size, reduce deformation and cracking tendency; refine grains, adjust organization, and eliminate organizational defects.
Steel quenching is to heat the steel to a critical temperature of Ac3 (sub-eutectoid steel) or Ac1 (over-eutectoid steel) above the temperature, hold for a period of time, so that all or part of the austenite, and then a faster cooling rate greater than the critical cooling rate to the Ms below (or Ms near isothermal) for martensite (or bainite) transformation of the heat treatment process.
Normalizing is a heat treatment to improve the toughness of steel. Steel components will be heated to Ac3 temperature above 30 ~ 50 ℃, after holding a period of time out of the furnace air-cooled. The main feature is that the cooling rate is faster than annealing and lower than quenching, normalizing can be made in a slightly faster-cooling steel crystalline grain refinement, not only can get satisfactory strength but also can significantly improve the toughness (AKV value), reduce the tendency of cracking components.
20.Charpy impact text:
The charpy impact test is a test used to determine the sensitivity (toughness) of metal materials to notches.