Archive for the News Category

Super Duplex · Field Note from FUSHUN METAL UNS S32750 / 1.4410 / 2507 Stress-Corrosion: The 1050 °C + 1.0 % Expansion Window That Gives Zero Crack Growth A recently published trial on UNS S32750 super duplex — the grade sold as DIN 1.4410, commercial name SAF

Forging & Heat Treat · Field Note from FUSHUN METAL Waspaloy-Class GH4698: Why a ‘U’-Shaped Die Beat an ‘H’ by 7.4× on Stress-Rupture Life A Chinese Waspaloy-class nickel-superalloy disk forging, in a recently published trial, took 376 hours to rupture at 650 °C / 705 MPa after

Failure Analysis · Field Note from FUSHUN METAL Nitrided Steel Is Not a Salt-Spray Shield: What Five Wet-Heat / Salt-Fog Cycles Did to 38CrMoAlA A nitrided surface is hard, wear-resistant, and dimensionally stable. It is not, by itself, a marine service rating. Recent published data on 38CrMoAlA

Metallography · Field Note from FUSHUN METAL Stop the Stopwatch: Why Fixed-Time Etching Fails — and the Dynamic Alternative A 15 °C swing in an unconditioned lab is enough to turn a serviceable micrograph into an over-etched one. The Arrhenius math says so, the four common etchants

The Hammer Is Not the Source of Quality: Rolling Instead of Forging for Large-Diameter Round Bars In the steel industry there is an unwritten rule: when a large-diameter round bar will become a loaded shaft, rod, or pin, it must go to a forging press. Forged, people

How to Determine Ferrite Content in Austenitic Stainless Steel: The Tool Most Buyers Misjudge Austenitic stainless steel combines corrosion resistance, heat resistance, low-temperature toughness, easy formability, and excellent weldability; it accounts for roughly 70% of all stainless steel output. Valve bodies, bonnets, and discs are almost exclusively

Not Every Signal Is a Flaw: Ghost Echoes in Ultrasonic Testing of Powder-Metallurgy Superalloy Rings FGH4096 is a second-generation damage-tolerant P/M superalloy: compared with first-generation alloys it trades some strength for excellent resistance to crack propagation, with a service temperature of 750 °C. A note on designations

Cracks Are a Carbide Problem: Continuous Casting of Cr12MoV Cold-Work Die Steel Cr12MoV is a classic high-carbon high-chromium cold-work die steel with high hardness, high wear resistance, and good hardenability. It is widely used for blanking dies, shearing dies, and cold-forming dies. A note on designations before

Heat Treatment Total Quality Control: The Discipline Behind the Furnace Door Heat treatment changes the microstructure of metal parts to deliver the required mechanical properties and service safety. It is a special process: final quality cannot be fully verified by inspection, because sampling and measurement are always