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Overview of HNGr High-Speed Steel (HSS):
HNGr is a grade of tungsten-molybdenum series high-speed steel. The "HNGr" designation is primarily used in certain regional or manufacturer-specific classification systems (e.g., sometimes found in Eastern European or specialized industrial contexts). It is broadly analogous to more universally recognized grades like M2 (AISI/SAE) or HS6-5-2 (ISO).
1. Key Characteristics & Composition
1）Primary Alloying Elements: Its properties are derived from a balanced combination of:
(1)Tungsten (W) & Molybdenum (Mo): Provide hot hardness (the ability to retain hardness at high temperatures generated during cutting) and wear resistance. Molybdenum also contributes to toughness and deep hardenability.
(2)Chromium (Cr): Enhances hardenability, wear resistance, and provides moderate corrosion resistance.
(3)Vanadium (V): Increases abrasive wear resistance, refines the grain structure, and contributes to secondary hardening.
(4)Carbon (C): Matched with the alloying elements to form hard carbides, ensuring high hardness and cutting edge retention.
2）Typical Properties:
1)High Red-Hardness: Can maintain a cutting edge at temperatures up to approximately 600°C (1112°F).
2)Excellent Wear Resistance: Suitable for machining abrasive materials.
3)Good Toughness: Less brittle than high-cobalt or high-vanadium HSS grades, offering better resistance to chipping.
4)Good Grindability: Compared to HSS grades with very high vanadium content.
2. Primary Applications:
HNGr is a versatile, general-purpose high-speed steel used for manufacturing a wide range of cutting tools, including:
1）Twist Drills, Taps, and Dies
2）End Mills, Reamers, and Broaches
3）Gear Cutters, Hobs, and Milling Cutters
4）Lathe Tools and Saw Blades
It is particularly suitable for machining carbon steels, alloy steels, cast iron, and certain non-ferrous metals under moderate to high-speed cutting conditions.
3. Advantages & Comparison：
1）Advantages:
(1)Cost-Effective Performance: Offers an excellent balance of hot hardness, wear resistance, and toughness at a lower cost than premium cobalt or powder metallurgy HSS grades.
(2)Versatility: A reliable "workhorse" grade for a vast array of cutting applications.
(3)Good Machinability & Grindability: Easier to fabricate and sharpen than some advanced grades.
2）Position in the HSS Family: HNGr (M2-type) sits in the mid-range of the HSS spectrum. It outperforms tungsten-only grades (like T1) in toughness and hardenability, but generally has lower red-hardness and wear resistance than high-cobalt (e.g., M35, M42) or high-performance powder metallurgy HSS grades.
