Accurate Thickness Tolerance Table for Cold Rolled Steel

The thickness tolerance of cold-rolled stainless steel plates must adhere to corresponding standards. It is advisable to acquire cold-rolled steel plates with varied thickness tolerances according to your needs. In this article, the thickness tolerance of cold-rolled steel plates is specified based on the national standards GBT24,511-2017 and GBT3280-2015, which detail the minimum acceptable thickness […]

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The thickness tolerance of cold-rolled stainless steel plates must adhere to corresponding standards. It is advisable to acquire cold-rolled steel plates with varied thickness tolerances according to your needs.

In this article, the thickness tolerance of cold-rolled steel plates is specified based on the national standards GBT24,511-2017 and GBT3280-2015, which detail the minimum acceptable thickness of the steel plate according to the PTA standard for thickness accuracy.

The thickness of cold-rolled steel plates usually ranges from less than 6mm, with popular thicknesses of 1.0, 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, and 6.0mm.

Cold-rolled steel plates with different thicknesses and finishes have varying thickness tolerance requirements.

According to the general thickness accuracy standard GB/T3280-2015 for Cold Rolled Stainless Steel Plates and Strips, the actual thickness of 304 cold-rolled steel plates with a thickness of 1mm and a width of 1219mm must be no less than 0.9mm.

The following table lists the thickness tolerance requirements of common cold-rolled steel plates based on the GB/T3280-2015 national standard and common thickness accuracy standards:

Table 1 Thickness Tolerance of Cold Rolled Steel Plate

According to GB/T3280-2015 Cold Rolled Stainless Steel Plate and Strip, PT. A (i.e. ordinary thickness accuracy)

Theoretical thicknessWidth case
1000 or 1219 ②15002000
0.5①≥0.45③≥0.42
0.8≥0.71≥0.7
1≥0.9≥0.88
1.2≥1.1≥1.08≥1.08
1.5≥1.38≥1.35≥1.35
2≥1.83≥1.8≥1.8
2.5≥2.28≥2.25≥2.25
3≥2.78≥2.75≥2.75
4≥3.65≥3.6≥3.6
5≥4.6≥4.55≥4.55
6≥5.6≥5.55≥5.55

Note:

  1. Unit: mm
  2. ① refers to the theoretical thickness of the steel plate, which is also the thickness commonly used in written descriptions. For example, 304 * 1000 * 2000 = 1, meaning a piece of 304 stainless steel plate with a thickness of 3mm, a width of 1m, and a length of 2m.
    ② The width of the steel plate is 1219mm, or 1.219m.
    ③ The minimum value that the actual thickness of the steel plate should reach according to the corresponding standards.

For example, ≥ 0.45 means that the actual thickness of the steel plate marked as 0.5mm must be greater than or equal to 0.45mm.

The following table lists the thickness tolerance requirements of common cold-rolled steel plates based on the GB/T24511-2017 national standard and common thickness accuracy standards:

Table 2 Thickness Tolerance of Cold Rolled Steel Plate

According to GB/T24511-2017 Stainless and Heat Resisting Steel Plates and Strips for Pressure Equipment (PT. A)

Theoretical thicknessWidth case
1000②12191500 or 2000
1.5①≥1.42③≥1.41≥1.4
2≥1.92≥1.91≥1.9
2.5≥2.41≥2.4≥2.39
3≥2.89≥2.88≥2.88
4≥3.87≥3.86mm≥3.86
5≥4.86≥4.85≥4.85
6≥5.85≥5.84≥5.84
8≥7.84≥7.83≥7.83

Notes:

  1. Unit: mm
  2. ① refers to the theoretical thickness of the steel plate, which is also the thickness commonly used in written descriptions. For example, 304 1.5 * 1000 * 2000 = 1, meaning a piece of 304 stainless steel plate with a thickness of 1.5mm, a width of 1m, and a length of 2m.
    ② The width of the steel plate is 1000mm, or 1m.
    ③ The minimum value that the actual thickness of the steel plate should reach according to the corresponding standards.

For example, 1.42 means that the actual thickness of the steel plate marked as 1.5mm must be greater than or equal to 1.42mm.

The thickness tolerance of cold-rolled stainless steel plates has set standards to follow. It is advisable to choose and purchase cold-rolled steel plates with varying thickness tolerances as necessary.

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Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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