StockSteel

The melting point of stainless steel typically ranges between ​​1375°C to 1530°C​​ (2507°F to 2786°F), depending on its alloy composition. For example, ​​304 stainless steel​​ melts at ​​1400–1450°C​​, while ​​316 stainless steel​​ has a slightly lower range of ​​1375–1400°C​​.Chromium and nickel content significantly influence this property, enhancing both heat resistance and structural integrity. Higher chromium levels (e.g., in 440C or 17-4PH grades) can further increase thermal stability, making these alloys suitable for high-temperature applications like aerospace components.

Passivation of stainless steel​​ involves treating the surface with nitric or citric acid to remove free iron particles and form a chromium-rich oxide layer. This process enhances the material’s natural corrosion resistance by creating a uniform protective film (Cr₂O₃), which prevents oxidation and pitting. Citric acid is increasingly preferred over nitric acid due to its eco-friendly profile and effectiveness in marine environments. Proper passivation is critical for applications like surgical instruments or chemical tanks, where even minor corrosion could compromise safety.

Screwing into stainless steel​​ requires careful preparation to avoid galling (thread seizing). Use lubricants like wax or specialized anti-seize compounds to reduce friction. Opt for hardened steel or titanium screws, as softer metals may wear down during installation. Pre-drilling pilot holes slightly smaller than the screw diameter ensures proper thread engagement without stressing the material. For high-stress applications, consider ​​304 or 316 stainless steel fasteners​​, which balance durability and corrosion resistance.

Despite its name, ​​stainless steel rust​​ can occur if the protective chromium oxide layer is damaged. Exposure to chlorides (e.g., seawater or road salt) or prolonged contact with acidic substances accelerates corrosion. For instance, ​​304 stainless steel​​ may rust in coastal environments, whereas ​​316 stainless steel​​ (with added molybdenum) resists pitting better. Surface contamination (e.g., iron particles) or improper passivation also compromises corrosion resistance. Regular cleaning and selecting grade-appropriate alloys for specific environments mitigate this risk.