Commonly terminology steel pipe standards

Commonly used terminology of the steel pipe standards

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    Standard Standard Uniform provisions made to the 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 abide by the guidelines and basis. At present, China's iron and steel products to the implementation of the standards are national standards (CB, GB / T), industry standards (YB), the local standards and enterprise standards.

    2, the technology standard requires the product should reach the performance and quality requirements known as the technical conditions, such as chemical composition, dimensions, surface quality, physical properties, mechanical properties, process performance, internal organization, delivery status.

 

    To ensure that conditions in accordance with the provisions of the metal material and technical conditions, the production plant should be tested and to ensure that test results meet the requirements of properties, chemical composition, internal organization and quality indicators, known as the guarantee conditions

 

   (1) steel is 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, the request in the order contract, the production plant must be carried out inspection and ensure compliance test results, project

 

   (2) steel pipe attached to ensure that conditions --- is specified in the standard, as long as the demand side specified in the contract requirements, the production plant must be tested to ensure that test results meet the requirements of the project

 

   (3) steel pipe protocol to ensure that the conditions - in the standard does not provide, upon the agreement between the project to guarantee specified in the contract, called the agreement to ensure that the conditions

 

   (4) the standard of reference conditions --- no regulations, or provisions not sought assurances from the demand side and consensus test project by the supply and demand sides, and the results are for reference only, not for the assessment, called the reference conditions

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    4, the students of the quality certificate of metallic materials production and other industrial products is not the same, according to a uniform standard provisions, implementation of products leaving the factory inspection system, the failure of metallic 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 the Yan grid, intersect, weight, etc., but also to provide a quality certificate for the guarantees provided for projects of all test results to confirm and guarantee the supply-side test results on the batch of products, also the demand side, the basis of the re-examination and the use of

 

    5, the quality and grade of the steel pipe surface quality, shape and size tolerances and other requirements are different, the steel pipe divided into several grades. For example, one product, two products. Sometimes a requirement to develop different levels. Divided into one, two, three, for example, for surface quality for surface decarburization depth is divided into one group, two groups have indicated that the difference in the quality

 

6, the accuracy class of metallic materials. There are several dimensions to tolerances and size tolerances of different sizes, divided into a number of levels, called Accuracy class are specified in the standard. 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. Accuracy class requirements written into the contract and other relevant documents in order, should be noted that

 

    Grade metal material grades, is taken from the name of each specific metallic materials. Grades of steel pipe also known as steel pipe No. 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 of varieties of metallic materials, refers to the different products of the purposes, shape, production processes, heat treatment status, size

 

    9 models of the type of metallic materials is to use Hanyu Pinyin (or Latin) letters and one or a few figures to indicate the different shapes, profiles and carbide products, code-named category. Numbers indicate the nominal size of the main parts of the

 

    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, the surface state is mainly divided into two kinds of light and not light. Common in the steel pipe wire and steel pipe with standard, the main difference is to take bright annealing or annealing general. To polishing, polishing, pickling, coating as a surface state look

 

    12, the edge state of the edge state is the steel tube is cutting edge in terms of. Trimming by trimming with a steel pipe, not cutting edge by trimming the strip