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2. Case-hardening - Wikipedia

   en.wikipedia.org/wiki/Case-hardening

   Case-hardening or carburization is the process of introducing carbon to the surface of a low-carbon iron, or more commonly a low-carbon steel object, in order to harden the surface. Iron which has a carbon content greater than ~0.02% is known as steel .

3. Nitriding - Wikipedia

   en.wikipedia.org/wiki/Nitriding

   Examples of easily nitridable steels include the SAE 4100, 4300, 5100, 6100, 8600, 8700, 9300 and 9800 series, UK aircraft quality steel grades BS 4S 106, BS 3S 132, 905M39 (EN41B), stainless steels, some tool steels (H13 and P20 for example) and certain cast irons. Ideally, steels for nitriding should be in the hardened and tempered condition ...

4. Rockwell hardness test - Wikipedia

   en.wikipedia.org/wiki/Rockwell_scale

   Steel, stainless steels, hard cast irons, pearlitic malleable iron, titanium, titanium alloys, deep case-hardened steel, other materials harder than 100 HRB: 100: 500 D: HRD: 100: spheroconical diamond † Thin steel and medium case-hardened steel and pearlitic malleable iron: 100: 500 E: HRE: 100: 1 ⁄ 8 in (3.18 mm) ball

5. Hardened steel - Wikipedia

   en.wikipedia.org/wiki/Hardened_steel

   If the metal has been hardened, the file fails to cut into the sample and glances off with little visible effect. Case hardened steel-Vickers hardness test. Case hardened articles starting as low carbon steel (0.5 - 1.5% carbon content) can also be labeled hardened steel.

6. Carburizing - Wikipedia

   en.wikipedia.org/wiki/Carburizing

   Carburization can be used to increase the surface hardness of low carbon steel. [3] Early carburization used a direct application of charcoal packed around the sample to be treated (initially referred to as case hardening), but modern techniques use carbon-bearing gases or plasmas (such as carbon dioxide or methane). The process depends ...

7. Carbonitriding - Wikipedia

   en.wikipedia.org/wiki/Carbonitriding

   This method is applied particularly to steels with low case hardenability, such as the seat of the valve. The process applied is initially carburizing to the required case depth (up to 2.5 mm) at around 900-955°C, and then carbonitriding to achieve required carbonitrided case depth.