Padrões nacionais de tolerância para placas de aço inoxidável com 5 mm de espessura

National Tolerance Standards for 5mm Thick Stainless Steel Plates

What is the national standard tolerance for 5mm thick stainless steel sheet and what is the actual thickness?

According to the national standard, the actual thickness of a 5mm thick stainless steel plate is normally less than 5mm, and more accurately it is in the range of 4.5mm to 5.2mm.

GB/T24511-2017, the national standard for heat-resistant and stainless steel plates and strips for pressure equipment, provides specifications for the thickness error range of 5mm stainless steel plates. These plates can be divided into hot-rolled steel plates and strips or cold-rolled steel plates and strips.

The 5mm error of non-inductive steel plate is as follows:

Permissible thickness deviation of hot-rolled steel sheets and strips
According to national standard (G5/T24.511-2017)

National standard for actual thickness of 5mm thick stainless steel sheet Accuracy class Width range (mm)
≤1200 >1200~1500 >1500~1800 >1800~2100
PT.A +0.31
-0.30		 +0.33
-0.30		 +0.36
-0.30		 +0.38
-0.30
PT.B ±0.28 ±0.30 +0.33
-0.30		 +0.35
-0.30

Observation:

  • PT. A refers to common precision, while PT. B refers to higher accuracy.
  • For example, according to PT. A, the tolerance range for a hot-rolled stainless steel plate 5mm thick and 1.5 meters wide should be between 4.7mm and 5.33mm. According to PT. B, the tolerance range should be between 4.7mm and 5.3mm.

Allowable thickness deviation of cold-rolled steel sheets and strips
According to national standard GB/T24511-2017

National standard for actual thickness of 5mm thick stainless steel sheet Width range (mm)
≤1000 >1000~1300 >1300~2100
Precision ±0.14 ±0.15 ±0.15

2. According to GB/T4237-2015 hot rolled stainless steel plate and strip, 5mm stainless steel plate can be divided into thick steel plate, steel strip and coiled steel plate, as follows:

Allowable thickness deviation of thick steel sheet
According to national standard GB/T4237-2015

5mm thick stainless steel plate Accuracy class Width range (mm)
1000 >1000~1500 >1500~2000 >2000~2500 >2500~4800
National standard for actual thickness PT.A ±0.31 ±0.33 ±0.36 ±0.41 ±0.65
PT.B ±0.28 ±0.30 ±0.34 ±0.36

Observation:

  • PT. A refers to common precision and PT. B refers to higher accuracy, in accordance with GB/T4237-2015.
  • For example, a hot-rolled stainless steel plate that is 5mm thick and 2 meters wide should have a thickness range of 4.64mm to 5.36mm according to PT. Requirements A and a thickness range of 4.66 mm to 5.34 mm according to PT. B requirements.

Permissible thickness deviation of steel strips and rolled steel sheets
According to national standard GB/T4237-2015

National standard for actual thickness of 5mm thick stainless steel strip Accuracy class Width range (mm)
1200 >1200~1500 >1500~1800 1800 ~ 2500
PT.A ±0.33 ±0.33 ±0.36 ±0.38
PT.B ±0.31 ±0.30 ±0.33 ±0.35

Observation:

  • PT. A refers to common precision and PT. B refers to higher accuracy, both in accordance with GB/T4237-2015.
  • For example, a hot-rolled stainless steel strip 5mm thick and 1.5 meters wide should have a thickness range of 4.67mm to 5.33mm according to PT. Requirements A and a thickness range of 4.7 mm to 5.3 mm according to PT. B requirements.
  • GB/T3280-2015, the national standard for cold-rolled stainless steel plates and strips, divides 5mm stainless steel plates into two categories: steel strips and cold-rolled steel plates.

Permissible thickness deviation of wide steel strips and rolled steel sheets
According to national standard GB/T3280-2015

National standard for actual thickness of 5mm thick stainless steel sheets and strips Width range (mm)
<1250 1250-2100
Accuracy Requirements ±0.4 ±0.45

Observation:

  • Based on GB/T3280-2015, the national standard for cold-rolled stainless steel plates and strips.
  • For example, the national standard tolerance for a cold-rolled stainless steel wide strip with a thickness of 5 mm and a width of 1.5 meters, a rolled steel plate, a longitudinal wide steel strip or a rolled steel strip should be between 4.55 mm and 5.45 mm.

Example: What is the national standard tolerance for 5 mm thick 304 sheet?

When the width of the steel plate is 1500mm, the standard deviation of the 5mm thick hot-rolled steel plate should be within -0.3mm, which means the thickness should not be less than 4, 7 mm, in accordance with GB/T24511-2017, the national standard for heat-resistant stainless steel plates and strips for pressure equipment.

For a cold-rolled steel plate with a thickness of 5mm and a width of 1500mm, the standard deviation should be within -0.15mm, which means the thickness should not be less than 4.85mm. This also complies with GB/T24511-2017.

It is important to note that the actual thickness of a 5mm thick steel plate must comply with the tolerance provisions specified by the relevant national standards as described above.

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