Non-standard steel pipe

Non-standard steel pipe is relative to the national standard seamless steel pipe in addition to the national standard of the special-shaped steel pipe, in the production of seamless steel pipe in accordance with national routine requirements to the size of the outer diameter, wall thickness classification, and allow a certain error, which is within the scope called national standard. In actual use, often the national standard has some limitations, which corresponds to the emergence of non-standard seamless steel pipe, non-standard steel pipe specifications to supplement the GB standard seamless steel pipe production and is not said the quality of seamless steel pipe than the national standard.

In the production of non-standard steel pipe, some of the national standard seamless steel pipe or round steel as a tube production, because the sales volume is small, often the price is higher than the ordinary GB seamless steel pipe, but non-standard seamless steel pipe is also drawbacks, because there is no fixed Of the standard requirements, and some manufacturers use two seamless steel pipe seamless pipe or defective as a tube, so the price is much cheaper. So non-standard seamless steel pipe prices are often unstable, the product quality is also uneven.