Grade comparisons, certificate reading and the fabrication problems that come up in quotations — written by the people who melt and test the material. 10 notes and counting.
Both are nickel-chromium alloys with 8–10% molybdenum, so room-temperature datasheets look alike. Above 800 °C they are limited by different mechanisms: 617 by creep and scale adhesion, 625 by a precipitate that does not survive.
Read the note →Both alloys survive furnace atmospheres, but they protect themselves differently: 600 relies on chromia, 601 on alumina. The choice usually turns on how often the furnace cycles, what sulfur is present, and whether the part ever sees aqueous corrosion.
Read the note →Both are nickel-chromium alloys hardened by titanium, aluminium and niobium. They are rarely interchangeable — the decision usually comes down to section size, welding and how hot the part really runs.
Read the note →Both handle aggressive chemistry, but they fail in different places. C276 is the chlorine and hypochlorite alloy; G3 is the sulphuric-phosphoric workhorse with better thermal stability and a lower alloy cost.
Read the note →The two nickel-copper grades share a base chemistry and almost nothing else. K-500 is 400 plus aluminium and titanium, aged to roughly double the yield strength — with real penalties in ductility, welding and magnetic behaviour.
Read the note →904L costs several times what 316L does per kilogram. It earns that premium in chloride plus sulphuric acid service — and wastes it in clean water. Here is how to tell which case you are in.
Read the note →Send the medium, temperature and pressure. We will tell you what we would quote — and what we would not.
