The product standards stipulate the allowable deviation of out-of-roundness, which is generally about 0.5 times the sum of the positive and negative diameter deviations. The round tube blank is 0.75 to 0.8 times the diameter tolerance, and the wire rod diameter is 0.75 to 0.8 times the diameter tolerance. It is specified that the absolute value is 0.24~0.60mm. The out-of-roundness of the outer diameter of the steel pipe is 0.5 to 1.0 times the sum of the diameter deviations, and the out-of-roundness of the steel wire is 0.5 times the sum of the diameter deviations.

Legal basis:

"Measures for the Administration of Industry Standards of the People's Republic of China"

Article 1 is to strengthen the management of industry standards and ensure industry standards For coordination and unification, these Measures are formulated in accordance with the provisions of the Standardization Law of the People's Republic of China and the Implementation Regulations of the Standardization Law of the People's Republic of China.

The second industry standard is a standard formulated for technical requirements that do not have national standards but need to be unified within a certain industry across the country. Industry standards must not conflict with relevant national standards. Relevant industry standards should be coordinated and unified and should not be duplicated. Industry standards will be abolished after the corresponding national standards are implemented.

Article 3 The following technical requirements that need to be unified within the industry can be formulated as industry standards (including the production of standard samples):

(1) Technical terms, symbols, codes ( (including codes), file formats, drawing methods and other general technical languages;

(2) Variety, specifications, performance parameters, quality indicators, test methods and safety and health requirements of industrial and agricultural products;

(3) Design, production, inspection, packaging, storage, transportation, use and maintenance methods of industrial and agricultural products as well as safety and health requirements during production, storage and transportation;

( 4) Technical requirements for general parts and components;

(5) Product structural elements and interchange and coordination requirements;

(6) Survey, planning, design, construction and acceptance of engineering construction Technical requirements and methods;

(7) Technical requirements for information, energy, resources, transportation and management technology.