What is the difference between GB and non - marking of I-beam?
The national standard refers to the approval issued by the national standardization administrative body, which is of great significance to the national economic and Technological Development and is unified throughout the country. The national standards are unified technical requirements throughout the country, and shall be formulated by the administrative department for standardization under the State Council to coordinate the project division of labor, organize the formulation (including revision), and uniformly examine and approve, number and issue.
The standard is generally standard commonly used material, dimensions and tolerances, supply conditions and other parameters, for enterprise scale production; non standard is based on the special purpose, made from GB limit, generally used for special occasions, not the general specifications and materials; such as general I-beam are the side wide narrow side. While some occasions need on both sides as wide as, and the use of quantity and large, so the separate order, relative standard I-beam, which is non-standard products
Nonstandard is the product that does not produce according to national standard. For example, the national standard angle, is expressly thick, but some will be used when the thin iron, the market also sells, it is non-standard products.
The difference between the national standard and non - standard I-beam is with the theory of similar size, such as the angle of 50*50*5, GB thickness is very close to 5, such as the thickness of Maanshan Iron and steel, is only reached 4.5, even more thin, so the difference between non standard, GB, is not the same thickness, the weight is not the same, when purchasing can meet the design requirements can choose the appropriate standard, this will save money, because the non-standard, much cheaper than gb.
