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  2. Machinability - Wikipedia

    en.wikipedia.org/wiki/Machinability

    Machinability Rating= (Speed of Machining the workpiece giving 60min tool life)/( Speed of machining the standard metal) Machinability ratings can be used in conjunction with the Taylor tool life equation, =, in order to determine cutting speeds or tool life. It is known that B1112 has a tool life of 60 minutes at a cutting speed of 100 sfpm.

  3. Speeds and feeds - Wikipedia

    en.wikipedia.org/wiki/Speeds_and_feeds

    The machinability rating of a material attempts to quantify the machinability of various materials. It is expressed as a percentage or a normalized value. The American Iron and Steel Institute (AISI) determined machinability ratings for a wide variety of materials by running turning tests at 180 surface feet per minute (sfpm). It then ...

  4. Free machining steel - Wikipedia

    en.wikipedia.org/wiki/Free_machining_steel

    Free machining steel costs 15 to 20% more than standard steel, but this higher cost is offset by increased machining speeds, larger cuts, and longer tool life. [1] The disadvantages of free machining steel are: ductility is decreased; impact resistance is reduced; copper-based brazed joints suffer from embrittlement with bismuth free machining ...

  5. Alloy steel - Wikipedia

    en.wikipedia.org/wiki/Alloy_steel

    Improves machinability Boron: 0.001–0.003 (Boron steel) A powerful hardenability agent Chromium: 0.5–2 Increases hardenability 4–18 Increases corrosion resistance Copper: 0.1–0.4 Corrosion resistance Lead — Improved machinability Manganese: 0.25–0.40 Combines with sulfur and with phosphorus to reduce brittleness. Also helps to ...

  6. Rockwell hardness test - Wikipedia

    en.wikipedia.org/wiki/Rockwell_hardness_test

    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.

  7. Tool steel - Wikipedia

    en.wikipedia.org/wiki/Tool_steel

    P-type tool steel is short for plastic mold steels. They are designed to meet the requirements of zinc die casting and plastic injection molding dies. L-type tool steel is short for low alloy special purpose tool steel. L6 is extremely tough. F-type tool steel is water hardened and substantially more wear resistant than W-type tool steel.

  8. Austenitic stainless steel - Wikipedia

    en.wikipedia.org/wiki/Austenitic_stainless_steel

    300 series stainless steels are the larger subgroup. The most common austenitic stainless steel and most common of all stainless steel is Type 304, also known as 18/8 or A2. Type 304 is extensively used in such items as cookware, cutlery, and kitchen equipment. Type 316, also known as A4, is the next most common austenitic stainless steel.

  9. Surface feet per minute - Wikipedia

    en.wikipedia.org/wiki/Surface_feet_per_minute

    Its most common use is in the measurement of cutting speed (surface speed) in machining. It is a unit of velocity that describes how fast the cutting edge of the cutting tool travels. It correlates directly to the machinability of the workpiece material and the hardness of the cutting tool material.

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