KT Metal Castings Blogs

Type 304 stainless steel offers better corrosion resistance and weldability, while 302 provides higher strength for applications like springs and fasteners. If you’re working with food equipment, doing extensive welding, or need general-purpose corrosion resistance, choose 304. If you need high-strength wire, springs, or cold-worked parts with minimal welding, choose…

GGG stands for “Kugelgraphitguss” (German for spheroidal graphite cast iron), and 50 refers to the minimum tensile strength of 50 kg/mm²(500 MPa). Originally designated under the German DIN 1693 standard, this material gets its name from its minimum tensile strength of 50 kg/mm². It’s now commonly known as EN-GJS-500-7 under…

GGG-50 and GGG-40 are two grades of ductile cast iron that differ primarily in their strength and ductility balance. GGG-50 offers 25% higher tensile strength (500 MPa vs 400 MPa) and better wear resistance, while GGG-40 provides double the elongation (15% vs 7%) and superior impact toughness. This fundamental trade-off—strength…

Stainless steel can remain rust-free for decades indoors, start showing rust within months near saltwater, or develop corrosion in mere weeks if exposed to harsh chemicals. The exact timeline depends on the steel grade you’re using and the environment it’s exposed to. Rust Timelines for Common Stainless Steel Grades Type…

You bought a shiny new stainless steel refrigerator, expecting it to look perfect forever. Six months later, rusty spots appear near the handle. What went wrong? You’re not alone. Thousands of homeowners feel cheated when their “stainless” steel products start rusting. Some even wonder if they got scammed with fake…

The main difference between 304 and 316 stainless steel is that 316 contains 2-3% molybdenum while 304 has none, giving 316 superior corrosion resistance especially against chlorides and making it about 20-50% more expensive than 304. Both are austenitic stainless steels with excellent overall properties. 304 works perfectly for most…

Stainless steel contains at least 10.5% chromium, which forms a protective oxide layer that prevents rust and corrosion. This versatile material comes in five main families—austenitic, ferritic, martensitic, duplex, and precipitation-hardening—each with unique properties that make them suitable for different applications. Composition of Stainless Steel Types of Stainless Steel Austenitic…

Stainless steel welding requires specific techniques and careful attention to detail that go beyond regular steel welding. The material’s unique properties – high chromium content for corrosion resistance, lower thermal conductivity, and higher thermal expansion – make it both valuable and challenging to work with. Can You Weld Stainless Steel…

Steel melts between 1370°C and 1540°C (2500°F to 2800°F), depending on its composition. Unlike pure iron which melts at exactly 1538°C, steel transitions from solid to liquid over a temperature range because it’s an alloy of iron, carbon, and other elements. The carbon content is the biggest factor affecting steel’s…

You’ve probably seen old aluminum siding turn dull gray. Or noticed white powder forming on an aluminum ladder. Your first thought might be: “Is that rust?” Here’s the thing that confused me when I first studied chemistry: we use “rust” and “corrode” like they mean the same thing. They don’t.…