Can S30409 be welded with ER308?
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Does S30409 have to use ER308H? The design temperature of the equipment is 370/537℃? Can I use ER308? Can equipment made with S30408 be welded with ER308H? The picture shows the comparison of the carbon content of ER308 and ER308H, which are ≤0.08 and 0.04-0.08 respectively. One has a specified lower limit and the other has no specified limit. I would like to know how the welding consumables factory differentiates between these two materials when producing them?
Depends on the usage situation! And welding assessment results!
The evaluation only looks at the mechanical properties, which are all Fe-8-1 and can cover each other. If it is specified to use ER308H, why not use ER308? The only difference between the two is the carbon content. Although the carbon content of ER308H has a lower limit of 0.04, for ER308, if the carbon content is lower than 0.04, it is basically close to 0.03 and becomes ER308L. If the carbon content of ER308 is also controlled above 0.04, what is the difference between it and ER308H?
Your temperature is a bit high. Standards stipulate that the C content of stainless steel at such a high temperature should not be less than 0.04%. Try to use ER308H safety insurance. If you have to use ER308, then retest it and its carbon content is not less than 0.04%, and it should be safe to use.