เหล็กผสมแท่ง
ภาพรวม
Maraging 300 (18Ni Maraging 300) is an ultra-high-strength, low-carbon iron-nickel martensitic steel that achieves its strength through age hardening (maraging) rather than carbon content. With approximately 18% nickel and 12% cobalt, Maraging 300 round bar delivers tensile strength of 1,930 MPa (280 ksi) minimum, combined with excellent fracture toughness, dimensional stability during heat treatment, and superior weldability. The round bar form is supplied in solution-annealed condition for machining, followed by a low-temperature aging cycle (480°C / 900°F) to develop full strength. It is widely used in aerospace, defense, tooling, and high-performance applications requiring extreme strength and toughness.
ช่วงขนาด
- Dia.:6 – 400mm(0.25 – 16in)
- L:1,000 – 4,000 mm (standard 3,000–3,500 mm)
ข้อกำหนดเกรด
| ระบบ | ค่า |
|---|---|
| 🇺🇸 UNS | K93120 |
| 🇺🇸 AMS | 6514 |
| 🇺🇸 ASTM | A538 Grade A |
| 🇩🇪 DIN | 1.6354 / X2NiCoMo18-9-5 |
| 🇪🇺 EN | EN 1.6354 |
| 🇨🇳 GB | 00Ni18Co8Mo5TiAl / 18Ni(300) |
องค์ประกอบทางเคมี
| ธาตุ | ค่า |
|---|---|
| C | ≤ 0.03 |
| Mn | ≤ 0.10 |
| Si | ≤ 0.10 |
| P | ≤ 0.01 |
| S | ≤ 0.01 |
| Ni | 18.00 – 19.00 |
| Co | 8.50 – 9.50 |
| Mo | 4.60 – 5.20 |
| Ti | 0.50 – 0.80 |
| Al | 0.05 – 0.15 |
| Zr | ≤ 0.01 |
คุณสมบัติเชิงกล
| productCenter.property | ค่า |
|---|---|
| Tensile Strength (MPa) | 950 – 1,100 |
| Yield Strength (MPa, 0.2% offset) | 650 – 850 |
| Elongation (%) | 15 – 20 |
| Reduction of Area (%) | 65 – 75 |
| Hardness (HRC) | 28 – 35 |
| Hardness (HB) | 280 – 340 |
| Impact Energy, Charpy V-Notch (J) | 75 – 100 |
คุณสมบัติทางกายภาพ
| คุณสมบัติ | หน่วย | ค่า |
|---|---|---|
| Density (g/cm³) | g/cm³ | 8.00 |
| Melting Range (°C) | °C | 1,410 – 1,450 |
| Modulus of Elasticity (GPa) | GPa | 190 |
| Modulus of Rigidity (GPa) | - | 74 |
| Poisson's Ratio | - | 0.30 |
| Coefficient of Thermal Expansion (µm/m·°C, 20–100°C) | ×10⁻⁶/K | 11.0 |
| Coefficient of Thermal Expansion (µm/m·°C, 20–300°C) | ×10⁻⁶/K | 12.5 |
| Coefficient of Thermal Expansion (µm/m·°C, 20–500°C) | ×10⁻⁶/K | 13.0 |
| Thermal Conductivity (W/m·K, 25°C) | W/m·K | 20.0 |
| Specific Heat (J/kg·K) | J/kg·K | 450 |
| Electrical Resistivity (nΩ·m, 25°C) | μΩ·cm | 610 |
| Electrical Conductivity (% IACS) | - | 2.8 |
การใช้งาน
- Aerospace & Defense
- Tooling & Dies
- Industrial & Precision Engineering
- Oil & Gas
- Motorsport & Automotive
- Scientific & Instrumentation
- Firearms
- Medical