5%HCl na 316L

[Mechanical_weld]

Has anyone met?
Is it possible use 316L steel for 5%HCl; Temp:ambient;~20C
Will it be resistant?

 

[shvet]

All kinds and varieties of stainless steels become active and are attacked by hydrochloric acid. In very low concentrations, the acid can cause pitting, crevice corrosion or CSCC. With duplex grades, the tendency is to attack the ferrite phase preferentially. This phenomenon is also observed in weldments in some cases.
Alloy 825 and Alloy 20 resist corrosion at all concentrations at temperatures <40 °C (100 °F).
The 6% Mo superaustenitic stainless steels, such as UNS S31254, UNS N08367, and UNS N08926, can be used in some applications in hydrochloric acid concentrations < 3 wt%. The 7% Mo superaustenitic stainless steel UNS S32654 with nominal 7.3% Mo can be used up to about 8% acid at room temperature.

Taken from

https://bit.ly/44iTsCd

 

[EdStainless]

Aeriated? Any oxidizing ions present (Fe or Cu)?
825 is a good option up to about 25% and 50C.
I would not use a 6-7% Mo SS, and I would not use alloy 20 or 625.
I wouldn't use 200 or 400 either as they are very sensitive to minor impurities.

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P.E. Metallurgy, consulting work welcomed

 

[Dhurjati Sen]

Rubber lined carbon steel piping / tanks is time tested for HCl service.

DHURJATI SEN
Kolkata, India

 

[pierreick]

Hi,
Consider this handbook. CS + liner.

Pierre