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Type 304—the most common grade; the classic 18/8 (18% chromium, 8% nickel) stainless steel. Outside of the US it is commonly known as "A2 stainless steel", in accordance with ISO 3506 (not to be confused with A2 tool steel). [6] The Japanese equivalent grade of this material is SUS304.
Minimum Yield Strength: B: Steel for reinforced concrete: ... Stainless and heat resistant steels 5x – 8x ... Carbon steels 1.1141 1.0401 1.0453: C15D C18D:
A2 stainless steel outside the US, ... (UNS S30409) is restricted to 0.04–0.10%, which provides optimal high-temperature strength. The carbon content of 304L (UNS ...
Very hard steel (e.g. chisels, quality knife blades): HRC 55–66 (Hardened High Speed Carbon and Tool Steels such as M2, W2, O1, CPM-M4, and D2, as well as many of the newer powder metallurgy Stainless Steels such as CPM-S30V, CPM-154, ZDP-189. There are alloys that hold a HRC upwards 68-70, such as the Hitachi developed HAP72.
The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.
The term may be used to reference steel that is not stainless steel; in this use carbon steel may include alloy steels. High carbon steel has many uses such as milling machines, cutting tools (such as chisels) and high strength wires. These applications require a much finer microstructure, which improves toughness.
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Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an iron-based alloy containing a minimum level of chromium that is resistant to rusting and corrosion. Stainless steel's resistance to corrosion results from the 10.5%, or more, chromium content which forms a passive film that can protect the material ...