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[{"role": "user", "content": "make list of tool steels grades"}, {"role": "assistant", "content": "Here is a list of common tool steel grades, categorized by their primary characteristics and applications. Tool steels are generally divided into groups based on their composition and intended use (e.g., cold working, hot working, or high-speed).\n\n### 1. Water-Hardening Tool Steels (W-Series)\nThese steels harden when quenched in water. They are easy to machine and grind but have low resistance to thermal shock.\n* **W1**: High carbon content; used for knives, punches, and dies.\n* **W2**: Contains tungsten; slightly better toughness than W1.\n\n### 2. Cold-Working Tool Steels (O, A, D-Series)\nDesigned for cutting and forming metals at room temperature. They offer high wear resistance and dimensional stability.\n\n**Oil-Hardening (O-Series)**\n* **O1**: General-purpose cold work steel; used for knives, shears, and simple dies.\n* **O2**: Higher hardness and wear resistance than O1; used for forming tools and thread-cutting tools.\n* **L6**: Toughness-focused oil-hardening steel; used for impact tools like chisels and drifts.\n\n**Air-Hardening (A-Series)**\n* **A2**: Most common air-hardening steel; good wear resistance and moderate toughness. Used for shears, form tools, and jigs.\n* **A6**: Low distortion air-hardening steel; used for precision parts where minimal shrinkage is critical.\n* **A7**: High-toughness air-hardening steel; used for impact tools like rivet sets and punches.\n\n**High-Carbon/High-Chromium (D-Series)**\n* **D2**: Semi-stainless, high-carbon, high-chromium steel. Excellent wear resistance but lower toughness. Widely used for stamping dies, blanking dies, and shear blades.\n* **D3**: Very high carbon version of D2; excellent wear resistance but brittle. Used for heavy-duty cutting tools.\n* **D4**: Highest carbon content in the D-series; extreme wear resistance but very difficult to machine.\n\n### 3. Hot-Working Tool Steels (H-Series)\nUsed for shaping metals at elevated temperatures (e.g., die casting, extrusion). They retain hardness at high temperatures.\n* **H13**: Most popular hot-work steel. Good balance of toughness, wear resistance, and heat check resistance. Used for die casting molds, extrusion tools, and hot forging dies.\n* **H11**: Higher toughness than H13; used for impact forging tools and extrusion dies.\n* **H10**: Intermediate between H11 and H13; used for lighter duty hot work.\n* **H19**: High toughness; used for extrusion tools and impact dies.\n\n### 4. High-Speed Steels (M and T-Series)\nRetain hardness at very high cutting speeds and temperatures. Used for drill bits, end mills, and saw blades.\n\n**Molybdenum-Based (M-Series)**\n* **M2**: The most widely used high-speed steel (HSS). Versatile for drilling, tapping, and milling.\n* **M35 (M42 with Cobalt)**: M2 with added cobalt for higher heat resistance. Used for stainless steel machining.\n* **M42**: High-cobalt HSS; excellent red hardness. Used for high-performance cutting tools.\n* **M3**: Similar to M2 but with vanadium additions for improved wear resistance.\n* **M4**: High-vanadium M2; exceptional wear resistance for abrasive materials.\n\n**Tungsten-Based (T-Series)**\n* **T1**: One of the earliest HSS types. Still used for special applications requiring high toughness.\n* **T2**: Similar to T1 but with slightly different carbide distribution.\n* **T44**: High-performance T-series steel for specialized cutting tools.\n\n### 5. Shock-Resisting Tool Steels (S-Series)\nDesigned to withstand severe impact and shock loading.\n* **S1**: High toughness; used for punches, dies, and tools subject to heavy impact.\n* **S2**: More versatile than S1; used for chisels, rivet sets, and pry bars.\n* **S4**: Higher carbon content than S2; used for heavier impact tools.\n* **S6**: Highest carbon in the S-series; used for extremely tough applications like hammer heads and drifts.\n\n### 6. Special Purpose Tool Steels\n* **P-Series (Plastic Mold Steels)**: e.g., P20. Pre-hardened steels used for plastic injection molds.\n* **L-Series (Low Alloy)**: e.g., L6 (also in O-series). Often used for low-distortion applications.\n* **Stainless Tool Steels**: e.g., 420 Stainless. Used when corrosion resistance is required along with tool properties.\n\n### Key Selection Criteria:\n* **Wear Resistance**: D2, M42, D4\n* **Toughness**: S2, L6, H11\n* **Heat Resistance**: H13, M42, T1\n* **Ease of Machining**: O1, A2, W1\n* **Dimensional Stability**: A2, A6, D2\n\nNote: Specific grade designations may vary slightly between standards (e.g., AISI/ASTM vs. DIN/EN). Always consult material data sheets for precise chemical compositions and heat treatment procedures.", "model": "Qwen/Qwen3-30B-A3B-Instruct"}]