Regarding the minimum thickness
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GB150 specifies that the minimum thickness for stainless steel containers is 3 mm. For a particular stainless steel container, the corrosion allowance is set to 0, the nominal thickness is 3 mm, and the negative deviation is 0.3 mm; therefore, the actual measured thickness is less than 3 mm. Some people think it no longer meets the national standards. What do you all think?
The minimum thickness is 3 mm, with no negative deviation for the steel plate.
Is stainless steel considered a high-alloy steel? After this forming process, it should be no less than (2mm + C2), right?
It represents the minimum thickness after the shell is processed and formed; after deducting the negative deviation, it represents the amount of thinning that occurs during the forming process
According to 4.3.7 of GB/T150.1, the minimum thickness refers to the smallest thickness of the shell after it has been manufactured, excluding the corrosion allowance. As stated by the poster, 3 mm minus the negative deviation (with a corrosion margin of 0) results in an actual thickness of 2.7 mm, which is greater than the specified standard value of 2 mm and meets the requirements of GB/T150.1.
The minimum thickness requirement is that the actual thickness of the material should be no less than 3 mm; this does not take into account any allowance for corrosion. However, this minimum thickness value is not very scientific. In our company, we generally use the internationally standard nominal thickness value of D/1000 + 2, plus an allowance for corrosion； For those with a larger diameter, even a minimum of 3 won’t work
Stainless steel is generally a high-alloy steel; according to clause 4.3.7 of GB/T150.1, the minimum thickness of the shell after shaping, excluding the corrosion allowance, should generally be no less than 2 mm.