The difference between the national standard and non-standard lies in the production standard, price, application scope and product quality. In practice, the national standard and non-standard quality is similar, mainly in the thickness of the difference between the "national standard" 1 thick is actually 1mm thick, and "non-standard" 1 thick, the actual thickness of only 0.8mm or other less than 1mm, "non-standard" 1 thick, the actual thickness of only 0.8mm or other less than 1mm, "non-standard" 1 thick. "Non-standard" is basically equivalent to the standard. Production standards are different, the national standard products are produced in strict accordance with national standards, even if there are errors, but also within the permissible range, non-standard products in accordance with the standard agreed with the customer production or production does not meet the provisions of national standards.
The industry is generally in line with national standards of steel called "national standard" does not meet national standards of poor quality steel called "standard", "non-standard".