Stainless Steel Thickness Chart (Standard Thickness vs. Real Thickness)

1. The standard thickness of stainless steel is different from the actual thickness.

The standard thickness of stainless steel refers to the marked thickness value (common thickness, such as 1mm, 2mm, 3mm, 4mm, etc.).

The real thickness of stainless steel refers to the actually measured thickness (the thickness is generally accurate to two digits after the decimal point, such as 0.85mm, 1.91mm, 2.75mm, 3.80mm, etc.).

Stainless Steel Thickness Chart (Standard Thickness vs. Real Thickness) 1

2. What is the difference between the standard thickness and the actual thickness of stainless steel plate?

The difference between the standard thickness of stainless steel and the actual thickness depends on the standard of stainless steel materials.

The standard thickness of stainless steel plate can refer to pressure bearing standard GB/T24511-2017, hot rolled national standard GB/T4237-2015, cold rolled national standard GBT3280-2015, cold rolled American standard ASTM A240/A240M-15a, etc.

Among them, the first three belong to the national standard stainless steel plate thickness tolerance standard.

What is the difference in the thickness of stainless steel plate under the national standard?

Please refer to the comparison table of standard thickness and the actual thickness of stainless steel plate below.

Table ① and Table ②:

When the width of steel plate is 1.2m, the standard thickness and actual thickness of stainless steel plate are compared as follows:

Standard thickness and actual thickness comparison table of stainless steel plate ①

Standard thickness

Real thickness (when the width of steel plate is 1.2m) (unit: mm)

General

Comply with pressure-bearing standard GB/T24511-2017

Conform to the national standard of hot rolling GB/T4237-2015

Conform to the national standard of cold rolling GB/T3280-2015

Conform to American Standard for Cold Rolling ASTM A240/A240M-15a

0.5

0.3~0.5

0.45~0.55

0.46~0.54

0.8

0.6~0.8

0.71~0.89

0.75~0.85

1

0.8~1

0.9~1.1

0.94~1.06

1.2

1~1.2

0.9~1.1

1.12~1.28

1.5

1.2~1.5

1.38~1.62

1.42~1.58

2

1.6~2

1.78~2.22

1.83~2.17

19~2.1

2.5

2.2~2.5

1.78~2.22

2.28~2.72

2.4~2.6

3

2.6~3

2.75~3.25

2.75~3.25

2.78~3.22

2.87~3.13

Comparison Table of Standard Thickness and Actual Thickness of Stainless Steel Plate ②

Standard thickness

Real thickness (when the width of the steel plate is 1.2m) (unit: mm)

General

Comply with pressure-bearing standard GB/T24511-2017

Conform to the national standard of hot rolling GB/T4237-2015

Conform to the national standard of cold rolling GB/T3280-2015

Conform to American Standard for Cold Rolling ASTM A240/A240M-15a

4

3.5~4

3.72~4.28

3.72~4.28

3.75~4.25

3.83~4.17

5

4.5~5

4.7~5.31

4.69~5.31

4.65~5.35

4.83~5.17

6

5.5~6

5.7~6.33

5.67~6.33

5.6~6.4

5.8~6.2

8

7.5~8

7.7~8.38

7.62~8.38

7.5~8.5

7.77~8.23

10

9.5~10

9.710.42

9.58~10.42

12

11.5~12

11.7~12.45

11.55~12.45

14

13.5~14

13.7~14.45

13.55~14.45

16

15.5~16

15.7~16.5

15.55~16.45

Table ③ and Table ④:

When the width of steel plate is 1.5m, the standard thickness and actual thickness of stainless steel plate are compared as follows:

Standard thickness and actual thickness comparison table of stainless steel plate ③

Standard thickness

Real thickness (when the width of the steel plate is 1.5m) (unit: mm)

General

Comply with pressure-bearing standard GB/T24511-2017

Conform to the national standard of hot rolling GB/T4237-2015

Conform to the national standard of cold rolling GB/T3280-2015

Conform to American standard STMA240/A240M-15a of cold rolling

0.5

0.3~0.5

0.42~0.58

0.8

0.6~0.8

0.7~0.9

1

0.8~1

0.88~1.12

0.92~1.08

1.2

1~1.2

1.08~1.32

1.12~1.28

1.5

1.2~1.5

1.35~1.65

1.4~1.6

2

1.6~2

1.8~2.2

1.89~2.11

2.5

2.2~2.5

2.25~2.75

2.37~2.63

3

2.6~3

2.72~3.28

2.72~3.28

2.75~3.25

2.85~3.15

Comparison Table of Standard Thickness and Actual Thickness of Stainless Steel Plate ④

Standard thickness

Real thickness (when the width of the steel plate is 1.5m) (unit: mm)

General

Comply with pressure-bearing standard GB/T24511-2017

Conform to the national standard of hot rolling GB/T4237-2015

Conform to the national standard of cold rolling GB/T3280-2015

Conform to American Standard for Cold Rolling ASTM A240/A240M-15a

4

3.5~4

3.7~4.31

3.69~4.31

3.6~4.4

3.83~4.17

5

4.5~

5

4.7~5.33

4.67~5.33

4.55~5.45

4.81~5.19

6

5.5~6

5.7~6.36

5.64~6.36

5.556.45

5.77~6.23

8

7.5~8

7.7~8.39

7.61~8.39

7.5~8.5

7.75~8.25

10

9.5~10

9.7~10.43

9.57~10.43

12

11.5~12

11.7~12.47

11.53~12.47

14

13.5~14

13.7~14.47

13.53~14.47

16

15.5~16

15.7~16.53

15.53~16.47

The actual thickness standard of stainless steel 304 is the same as the figure above.

The actual thickness of stainless steel 304 can be determined according to the corresponding width and standard of stainless steel plate.

3. Actual influence of standard thickness and real thickness of stainless steel

It should be noted that the real thickness of stainless steel is generally less than the standard thickness.

The standard thickness of stainless steel is also called the theoretical thickness.

For example, the stainless steel plates (mm, i.e. mm) with the actual thickness of 2.75mm and 2.8mm will be classified as the steel plates with the theoretical thickness of 3m (i.e. 3 thick steel plates).

When purchasing stainless steel plates, you should pay attention to the difference between the real thickness and the standard thickness of stainless steel.

If the total price of stainless steel materials is calculated by actual weight, the price per unit weight is mainly affected by market conditions and material quality.

If the total price of stainless steel material is calculated by theoretical weight (weight calculated by standard thickness, see: calculation formula of steel plate weight), the price of unit weight is comprehensively affected by the difference between standard thickness and actual thickness, market situation and material quality.

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