Which one has stronger intergranular corrosion resistance, S321 or S304?
Thread Content
Since TI has been added to S321, it should have better resistance to intergranular corrosion, but why do some say that 304 has greater resistance to intergranular corrosion? Was it a mistake, or was there some other reason?
304 is the most basic austenitic stainless steel, with weak resistance to intergranular corrosion. Solutions for intergranular corrosion: 1. Solution heat treatment ； 2. Ultra-low carbon ； 3. Stabilization (addition of titanium or niobium). Therefore, 321 (titanium-containing) has a stronger resistance to intergranular corrosion than 304.
To be honest, I’m not sure whether the 321 grade is imported or domestically produced; as for the domestic version, I’d say it’s actually 304 – there’s no titanium in it at all! ! ! !
So when we had a tender for high-pressure instrument pipes and valves, we needed brands that were imported, with a material grade of 321; yet in the end, it was domestic brands that claimed to be imported ones that won the bid! ! Property owners generally don’t understand this market situation – the price of 321 abroad is roughly 4 times that of 316! Meanwhile, the domestic 321 is cheaper than the imported 316, so there’s nothing to do about it!
I’m hearing for the first time that abroad, the price of 321 is four times that of 316. Kaichuan’s bragging is getting more and more outrageous