Introduction
Steel Properties : It mainly used to produce drill, tap, saw bit and high efficiency wood tool.
Applications : It is an economical low alloy high-speed steel with good red hardness, good toughness and thermal plasticity. It is generally used soft and moderate intensity metal.
Chemical Composition : (%)
| Special grade | C | Si | Mn | Cr |
|---|---|---|---|---|
| TG4241 | 0.90-0.95 | 0.80-1.20 | 0.25-0.40 | 4.00-4.50 |
| TG4341 | 0.83-0.93 | 0.70-1.00 | 0.20-0.40 | 3.80-4.50 |
| Mo | V | W | P | S |
|---|---|---|---|---|
| 1.00-1.20 | 0.80-1.00 | 1.80-2.50 | ≤0.030 | ≤0.020 |
| 2.50-3.50 | 1.20-1.80 | 3.50-4.50 | ≤0.030 | ≤0.020 |
Production Process :
| Under Annealed Condition : | Reduction Ratio : | Delivery Status : |
| Hardness : HB205-255 | As 1:4 or 1:5 | As Cold drawn / Hot rolled / forged, in annealed condition |
Sizes of Round Bars :
| Cold Drawn/Ground Bar | Hot Rolled Annealed Peeled Bar | Forged Anealed Turned Bar | Coil |
| Φ 2.0 - 14.4mm | Φ 14.5 - 80.0mm | Φ 81.0 - 255.0mm | Φ 2.0 - 13.5mm |
Sizes of Flat Bars :
| Thickness | Width |
| 5mm - 150mm | 5mm - 810mm |
Sizes of Square Bars :
| 4mm - 100mm |
Sizes of Sheets :
| Thickness | Width | Length |
| 0.5mm - 12mm | 810mm | 2500mm |
Heat Treatments :
Annealing :
- Annealing temperature : 860-880℃, keep this temperature by 2-4 hours, then cooling to 600℃ in the speed of less than 30℃/h.
- If after cold drawn process, suggest and stress relieving annealing process. Under the temperature of 600-700℃, keep this temperature by 2 hours.
- Quenching & Tempering (salt bath).
Quenching :
Pre-heating in two steps :
- Heating temperature under: 400-500℃ and 850-900℃
- TG4241 Austenitizing temperature: 1150-1180℃
- TG4341 Austenitizing temperature: 1160-1190℃
- Heating coefficient 10-15sec/mm, quenching under 580-620℃, then cooling to room temperature.
- Quenching temperature difference in 5-10℃ between TGM2, TGM2A;
- TGM2A's quenching temperature is higher than TGM2
Tempering :
- Tempering temperature under:540-560℃, tempering 3 times, each time 1 hour, then cooling to room temperature.
