24 July 2021 High Speed Steel Bar
DIN 1.3343 High Speed Steel bar
DIN 1.3343 high-speed steel is a high speed tool steel with high tungsten content and high wear resistance. It is the representative steel grade of tungsten-molybdenum series general high-speed steel. The steel has the advantages of fine and uniform carbides, high toughness, and good thermoplasticity. DIN 1.3343 high-speed steel is a high-alloy steel containing a variety of alloying elements, which is a type of ledeburite steel. It has high hardness, high wear resistance, high thermal hardness, high hardenability and sufficient plasticity and toughness, and has good casting, forging, welding and machining properties, so it occupies an important position in high-speed tool steel.
Din 1.3343 is a standard high-speed steel grade. Having balanced alloy composition forms the basis of its high toughness and good cutting edge retention, rendering it suitable for a large variety of applications.
This grade is mainly used for all metal-cutting tools for roughing or finishing such as twist drills, diverse milling cutters, the thread dies, broaches, reamers, countersinks, thread chasers, circular saw segments, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws. Standard high-speed steel grade. Its well-balanced alloy composition forms the basis of its high toughness and good cutting edge retention, rendering it suitable for a large variety of applications.
For all metal-cutting tools for roughing or finishing such as twist drills, diverse milling cutters, the thread dies, broaches, reamers, countersinks, thread chasers, circular saw segments, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Cu(％) | V(％) | Mo(%) | W(%) |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.80～0.90 | 0.20 ~ 0.45 | 0.15 ~ 0.40 | ≤0.030 | ≤0.030 | 3.80～4.40 | ≤0.30 | ≤0.25 | 1.75 ~ 2.20 | 4.50 ~ 5.50 | 5.50 ~ 6.75 |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Impact Energy KV(J) | Elongation at Fracture A(%) | Impact toughness value αkv (J/cm2) | Hardness |
|---|---|---|---|---|---|
| ≥ 1760(100) | ≥ 1980(110) | ≥ 108 | ≥ 10 | ≥ 98 | ≥ 63 HRC |
Physical Properties:
| Density | 0.294 lb/in3 (8138 kg/m3) |
|---|---|
| Specific Gravity | 8.15 |
| Modulus of Elasticity | 0.294 lb/in3 (8138 kg/m3) |
| Thermal conductivity | 24 Btu/ft/hr/°F 41.5 W/m/°K |
| Machinability | 65% of a 1% carbon stee |
Thermal Properties:
| Thermal properties | Metric | Imperial |
|---|---|---|
| CTE, linear (@20.0 – 100°C/ 68.0 – 212°F) | 10 μm/m°C | 5.56 μin/in°F |
| CTE, linear (@20.0 – 500°C/68.0 – 932°F) | 12.2 μm/m°C | 6.78 μin/in°F |
| CTE, linear (@20.0 – 850°C/68.0 – 1560°F) | 12.6 μm/m°C | 7 μin/in°F |
Forging of AISI DIN 1.3343 High Speed Steel:
Pre heat M2 HSS steel slowly and uniformly to 850-900°C. The heat should then be increased more quickly to the forging temperature of 1050-1150°C. If during the forging the temperature of the M2 high speed tool steel material drops below 880-900°C, re-heating will be necessary. Cool the M2 steel component very slowly after forging.
Heat Treatment of DIN 1.3343 Steel HSS
Anneal
Heat to 1600° F, soak thoroughly at heat. Furnace cool 25° F per hour to 900° F, air cool to room temperature. Approximate annealed hardness 241 Maximum Brinell.
Stress Relief of Unhardened Material: Heat slowly to 1200 to 1250° F. Soak for two hours per inch of thickness at heat. Slow cool (furnace cool if possible) to room temperature.
Harden
Heat slowly to 1550° F, soak thoroughly, heat to 1850° F, soak thoroughly. Soak time in the furnace varies from a few minutes to 15 minutes, depending tool size, heat capacity of the furnace, and the size of the charge. – Heat to 2150 to 2200° F for max. toughness and minimum distortion. – Heat to 2250 to 2275° F for max. hardness and abrasion resistance.
Quench
For full hardness, oil quench to 150-200° F. Air quench to 150° F. When quenching in hot salt maintain the quench just above the Ms temperature. After equalizing withdraw parts from the hot salt and air cooled to 150° F.
Temper
Double temper is mandatory, three tempers are sometimes preferred. Soak for 2 hours per inch of thickness. Air cool to room temperature between tempers. The best tempering range for hardness, strength and toughness is 1000 to 1050° F.
| Temper° F | Rockwell “C” | Temper° F | Rockwell “C” |
|---|---|---|---|
| As-quenched | 64 | 900 | 64 |
| 400 | 63 | 1000 | 65.5 |
| 500 | 62.5 | 1050 | 63.5 |
| 600 | 62.5 | 1100 | 61.5 |
| 700 | 62.5 | 1150 | 60 |
| 800 | 63.5 | 1200 | 53 |