National Standard for Tolerance of 5MM Thick Stainless Steel Plate

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

The actual thickness of 5mm steel plate is generally less than 5mm. More accurately, the actual thickness of 5mm steel plate is 4.5-5.2mm.

Refer to the following table for the thickness error range of 5mm stainless steel plate specified in the national standard:

1. According to GB/T24511-2017 Stainless Steel and Heat Resisting Steel Plates and Strips for Pressure Equipment, 5mm stainless steel plates can be divided into hot rolled steel plates and steel strips, cold rolled steel plates and steel strips.

National Standard for Tolerance of 5MM Thick Stainless Steel Plate 1

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

Allowable thickness deviation of hot rolled steel plate and strip
According to national standard (G5/T24,511-2017)

National standard for actual thickness of 5mm thick stainless steel plate 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

Note:

1. PT. A refers to ordinary precision, PT, B refers to higher precision;

2. For example, the tolerance of hot rolled stainless steel plates with a width of 1.5 meters and a thickness of 5 meters should be between 4.7-5.33 mm according to FT. A and 4.7-5.3 mm according to FT. B.

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

National standard for actual thickness of 5mm thick stainless steel plate   Width range (mm)
≤1000 >1000~1300 >1300~2100
Accuracy ±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 plate
According to the 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

Note:

1. PT. A refers to ordinary precision and PT. B refers to higher precision, both of which comply with GB/T4237-2015;

2. For example, the hot-rolled stainless steel plate with a width of 2 meters and a thickness of 5 mm should be 4.64-5.36 mm according to the requirements of PT. A, and 4.66-5.34 mm according to the requirements of PT. B.

Allowable thickness deviation of steel strip and rolled steel plate
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

Note:

1. PT. A refers to ordinary precision and PT. B refers to higher precision, both of which comply with GB/T4237-2015;

2. For example, the hot-rolled stainless steel strip with a width of 1.5 meters and a thickness of 5 mm should be 4.67-5.33 mm according to the requirements of PT. A and 4.7-5.3 mm according to the requirements of PT. B.

3. According to GB/T3280-2015 Cold Rolled Stainless Steel Plates and Strips, 5mm stainless steel plates are divided into steel strips and rolled steel plates, as follows:

Allowable thickness deviation of wide steel strip and rolled steel plate
According to national standard GB/T3280-2015

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

Note:

1. From GB/T3280-2015 Cold Rolled Stainless Steel Plates and Strips;

2. For example, the national standard tolerance should be 4.55-5.45 mm for cold-rolled wide stainless steel strip with a width of 1.5 m and a thickness of 5 mm, rolled steel plate, longitudinal wide steel strip and rolled steel strip.

[Example]: What is the thickness difference of the national standard 5mm 304 plate?

When the steel plate race is 1500mm, the standard deviation of 5mm thick hot rolled steel plate is within -0.3, that is, the thickness is more than 4.7mm, which is in accordance with GB/T24511-2017 Stainless Steel and Heat Resistant Steel Plates and Strips for Pressure Equipment.

When the width of the steel plate is 1500mm, the standard deviation of 5mm cold rolled steel plate is within -0.15, that is, the thickness is greater than 4.85mm, that is, it complies with GB/T24511-2017 Stainless Steel and Heat Resistant Steel Plates and Strips for Pressure Equipment.

The actual thickness of 5mm thick steel plate shall conform to the tolerance provisions of corresponding national standards, as described above.

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