Flat Steel Tolerance

　　According to GB 704-88 of "Size, Shape, Weight and Allowable Deviation of Hot-rolled Flat Steel", the upper deviation of ordinary grade is allowed to be +0.3mm, and the lower deviation is -0.5mm; the upper deviation of higher grade is allowed to be +0.2mm, and the lower deviation is -0.4mm.

　　For flat steel with fixed length or double length, the allowable deviation of the length shall comply with the following regulations:

　　Length≤4m————————+30, 0mm

　　Length>4～6m———————+50, 0mm

　　Length>6m————————+70, 0mm

　　1. What is the allowable deviation range of the flat steel national standard?

　　Under the YB/T4001.1-2007 standard, the allowable deviation of the flat steel size (in millimeters)

　　1. Thickness of flat steel: 3-16mm allowable deviation +0.2mm -0.4mm

　　2. Flat steel width: 10-50mm allowable deviation +0.3mm-0.9mm

　　3. Flat steel width: 50-75mm allowable deviation +0.4mm--1.2mm

　　4. Flat steel width: 75-100mm allowable deviation +0.7mm-1.7mm

　　5. Flat steel width: 100-150mm allowable deviation +0.8mm -1.8mm

　　6. Under the YB/T4001.1-2019 standard, the allowable deviation of the load-bearing flat steel size (in milliseconds

　　rice)

　　7. Thickness of flat steel: 3-5mm, allowable deviation +0.3mm

　　8. Thickness of flat steel: 5-16mm, allowable deviation +0.4mm

　　9. Flat steel width: 50mm allowable deviation +0.4mm

　　10. Flat steel width: 50-75mm, allowable deviation 0.5mm

　　11. Flat steel width: 75-150mm allowable deviation +1.0mm