| steel commonly used standard terminology | serial number | Name | Description | 1 | standards | standard Uniform provisions made for repetitive things and concepts. The integrated results of the scientific, technical and practical experience by the concerned parties unanimously approved by the competent authority, released a specific form, as to comply with the criteria and basis. At present, China's iron and steel products to the implementation of the standards are national standards (GB, GB / T), industry standards (YB), local standards and enterprise standards. | 2 | conditions | standard requiring a product should meet the performance and quality requirements known as the technical conditions, such as chemical composition, dimensions, surface quality, physical properties, mechanical properties, process performance, the internal organization of the delivery status. | 3 | to ensure that the condition | in accordance with the provisions of the metal material and technical conditions, the production plant should be inspected to ensure that test results meet the requirements of properties, chemical composition, internal organization and quality indicators, known as the guarantee conditions : (1) the basic guarantee for the condition - also known as a necessary condition, refers to the standards set forth in, regardless of whether the demand side in order contract requirements, the production plant must be tested and to ensure that test results meet the required project; (2) additional warranty conditions - specified in the standard, as long as the demand side specified in the contract requirements, the production plant must be tested and to ensure that test results meet the required project; (3) The agreement will guarantee conditions - no requirement in the standard specified in the contract upon the agreement between the project to guarantee, called the agreement to ensure conditions; (4) Reference conditions - Standard or provisions not required to ensure, by the demand side and supply and demand sides consultation agreed to test the project, the results are for reference only, not for the assessment, called the reference conditions. | 4 | quality certificate | metallic materials production and other industrial products, according to uniform standards requirements, and implementation of products leaving the factory inspection system, the failure of the metal materials are not allowed to delivery . For delivery of metal materials, the manufacturing plant to provide a quality certificate to guarantee its quality. The certificate of the quality of the metal material is not only the name of the materials, specifications, delivery number, weight, etc., but also provides all the test results of the guarantees provided for the project. The quality certificate is to confirm and guarantee of supply-side test results on the batch of products, is also the basis of demand-side re-examination and use. | 5 | quality grade | steel surface quality, shape and size tolerances and other requirements are different, the quality of steel is divided into several grades. For example, a product, the two products. Sometimes a requirement to develop different levels, such as surface quality is divided into one, two, three, divided into one group, two groups for surface depth of decarburization, have indicated that the difference in quality. | 6 | precision level | some metal materials, the standard provides several size tolerances and size tolerances of different sizes, divided into several grades, known as the accuracy class. Accuracy class according to the allowable deviation is divided into ordinary precision, high accuracy and high precision. Higher accuracy class, which allows the smaller size of deviation. When ordering, you should pay attention to the accuracy class requirements to write the contracts and other relevant documents. | 7 | grades | metal material grades, take the name specific to each type of metal materials. Steel grades also known as steel. Grades of metal materials in China, can reflect the chemical composition. Grades not only that specific varieties of metallic materials, and based on it can largely determine its quality. , Grade and easily provide a common concept of the specific quality of metal materials, which bring great convenience for the production, use and management. | 8 | varieties | the variety of metal materials, refers to the purposes, shape, production processes, heat treatment, particle size of different products. | 9 | Model | metal material model refers to Hanyu Pinyin (or Latin) letters and one or a few figures to indicate the different shapes, types of profiles and carbide products code. The numbers indicate the main parts of the nominal size. | 10 | specifications | specifications refers to the different sizes of the same species or the same type of metallic materials. The general size of the allowable deviation. Product standards, the specifications of the varieties is usually by small to large, sequentially arranged. | 11 | surface state | be divided into light and bright two kinds. Common standards of wire and strip, the main difference is to take bright annealing or annealing general. Polishing, polishing, pickling, coating, etc. as the surface state view. | 12 | edge of the state | edge of the state refers to the strip whether the cutting edge in terms of. Trimming trimming strip, not cutting edge by not trimming strip. | 13 | Delivery Status | delivery status refers to the delivery of the product of the final plastic deformation processing or final heat treatment condition. Hot rolling (forging) and cold-rolled state without heat treatment delivery. Delivery of heat treatment, normalizing, annealing, high temperature tempering, quenching and solid solution and other processed collectively referred to as heat treatment categories, respectively, said normalizing, annealing, high-temperature tempering, quenching and other state delivery. | 14 | material hardness of | refers to the use of different heat treatment or the degree of hardening, the hardness of the resulting steel. In some strip standard is divided into special soft strip, soft strip, semi-soft strip, low-hard strip and hard strip. | 15 | vertical and horizontal | steel standard called vertical and horizontal, refer to and rolling (forging) and the relative relationship of the drawing direction, and the processing is parallel to Walker said longitudinal ; and machining direction perpendicular to said lateral. Sample taken along the machining direction is called the longitudinal sample; said transverse specimens with the processing direction perpendicular to take samples. Playing the fracture in the longitudinal sample is perpendicular to the rolling direction, it is called the transverse fracture; dozen of the fracture on the transverse specimens, parallel to the machining direction, it is called the longitudinal fracture. | 16 | theory of quality and actual quality of | two different calculation methods of the delivery of quality. Delivery of the theoretical mass, calculated according to the size and density of the material of nominal delivery quality. The actual quality of delivery, the delivery of quality materials by weighing (weighing) the proceeds. | 17 | nominal size and actual size | nominal size refers to the standard specified in the nominal size, and want to get the ideal size of the production process. But in the actual production, steel size is often greater than or less than the nominal size, the actual size, called the actual size. | 18 | deviation and tolerance | difficult to reach the public in the actual production of that size, specified in the standard one to allow the difference between the actual size and nominal size, called the deviation. Called the negative bias, the difference is negative to positive is called the positive deviation. Specified in the standard allows the absolute value of the positive and negative deviations and is called tolerance. Directional bias, that the "positive" or "negative", the tolerance of non-directional. | 19 | delivery length | steel delivery length, there are four provisions in the existing standards: (1) the usual length - also known as non-definite length standard within the provisions, where the steel length and fixed length, are referred to as the usual length. Convenient for packing and shipping and measurement, and all enterprises shear steel, depending on the circumstances the best cut into the size of several different lengths, and strive to avoid chaos foot. (2) Length Length Length Length - requirements by ordering a fixed length (the length of the steel plate is cut to width and length) is called, for example, length is 5m, then the number of delivery to the steel length are 5m. But in fact are 5m long, also provided to allow a positive deviation. (3) times the foot length - the ordering requirements of the single-length cut is equal to the order integral multiples of the single-length, called the double length, such as the haplotype length is 950mm, then cut into double foot is 1960mm three times the foot of 950 × 3 = 2850mm. (4) Where the length is less than the standard, usually the length of the lower limit, but not less than the minimum allowable length, known as the short length. | 20 | smelting method | what refers to the use of steel-making furnace smelting, such as open hearth furnace, electric arc furnace, furnace, vacuum induction furnace and mixed steelmaking smelting. "Smelting" the meaning of the term standard does not include the deoxy method (such as full-deoxy-killed steel, semi-deoxy semi-killed steel and rimmed steel) and the casting method (see above note, bet, continuous casting) these concept. | 21 | chemical composition (ingredients) | chemical composition of steel products, including principal component and impurity elements, its content by weight percentage. | 22 | steel melting composition refers to the steel melting (such as tank deoxy) finished pouring the chemical composition of the medium-term. | 23 | finished ingredients | finished steel components, also known as validation analysis component is the prescribed method (see GB/T222) drill or planing to take the test debris from the finished steel, and according to the prescribed standard method of analysis to the chemical composition. The finished composition of steel is mainly for the use of department or the inspection department of the acceptance of steel. Production plant general failure to do product analysis, but should ensure that the finished product ingredients to meet the standard requirements. Some of the major product, or sometimes for some reason (such as process changes, the quality of instability, and melting composition close to the upper and lower limits, melting analysis did not take to, etc.), production plant also made the analysis of the finished composition. | 24 | high quality steel and high quality steel (A word) | also known as the quality of steel and quality steel, the difference is that the high quality steel in the following areas as part of or the whole part is better than high quality steel: ① narrow the scope of the carbon content; ② reduce harmful impurities (mainly sulfur, phosphorus) content; to ③ ensure the high purity (less inclusion content); ④ to ensure high mechanical and technological properties. |