マレージング250
Maraging 250 is an 18% nickel, cobalt-strengthened steel (C-Type) with excellent properties, workability, and heat treatment characteristics. It offers the highest fracture toughness rating of all commercial maraging steel grades, with a nominal yield strength of 250 ksi (1724 MPa).
- 一般的なフォーム： Round Bar, Plate, Forged Billet, Sheet.
- 主な特徴 Highest fracture toughness in the Maraging family.
- Heat Treatment: Simple aging process; virtually no dimensional distortion.
- パフォーマンス Retains high strength up to 840°F (450°C).
While Maraging 300 and 350 offer higher tensile strength, マレージング250 is the choice when toughness is the priority. It exhibits the best resistance to crack propagation, making it critical for components subject to sudden shock loads or cyclic fatigue, such as missile casings and heavy-duty landing gear.
Maximum Toughness
Offers superior KIC (Plane Strain Fracture Toughness) values compared to 300 and 350 grades, preventing brittle failure.
Dimensional Stability
Uniform, predictable shrinkage during heat treatment allows parts to be machined to very close tolerances before hardening.
Weldability
Excellent weldability in the annealed condition without preheating. The heat-affected zone can be restored to full strength by simple aging.
| エレメント | コンテンツ（%） |
|---|---|
| ニッケル（Ni） | 17.0 - 19.0 |
| コバルト | 7.0 - 8.5 |
| モリブデン (Mo) | 4.6 - 5.2 |
| チタン（Ti） | 0.3 - 0.5 |
| アルミニウム（Al） | 0.05 - 0.15 |
| 鉄（Fe） | バランス |
*Note: The lower Titanium content contributes to its superior toughness compared to higher grades.
| 製品形態 | Standards (AMS / ASTM / MIL) |
|---|---|
| Bar, Forgings, Tubing | AMS 6512 |
| プレート、シート、ストリップ | AMS 6520 |
| Military Spec | MIL-S-46850 Type IV |
| Chemical Comp | ASTM A538 (Grade A) |
| プロパティ | 代表値（室温） |
|---|---|
| 降伏強さ（0.2%オフセット） | 240 - 265 ksi (1655 - 1827 MPa) |
| Ultimate Tensile Strength | 250 - 275 ksi (1724 - 1896 MPa) |
| 伸び | 10 - 12 % |
| 面積の縮小 | 45 - 55 % |
| 硬度（ロックウェルC） | 48 - 52 HRC |
| Fracture Toughness (KIC) | > 80 ksi√in (Excellent) |
*Note: Properties achieved after aging at 900°F (482°C) for 3-6 hours.
Missile Casings
Solid propellant rocket motor cases where high strength-to-weight ratio and toughness are vital.
Aircraft Load Cells
Precision force measurement components that require zero hysteresis and high stability.
Power Shafts
Drive shafts and gears in high-performance motorsport and aerospace transmissions.
Heavy Duty Fasteners
Bolts and fasteners subjected to high shock loads and shear forces.
Need Maraging 250 Steel?
We stock Maraging 250 in round bar and forged billet forms. All material is Vacuum Induction Melted and Vacuum Arc Remelted (VIM-VAR) for purity.
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