What Is the JIS Equivalent of H13 Tool Steel?
When sourcing tool steel across international supply chains, engineers often need to translate material grades between different national standards. One of the most common questions is how the American hot-work steel H13 corresponds to Japanese standards.
In the Japanese Industrial Standard (JIS) system, the closest equivalent to AISI H13 is SKD61. Both grades belong to the same family of chromium-molybdenum-vanadium hot-work tool steels and are designed for high-temperature tooling applications.
For a broader overview of global equivalents and comparisons, see the Guía de comparación y equivalencia del H13.
The JIS Equivalent of H13: SKD61
The Japanese equivalent of AISI H13 is SKD61, specified under JIS G 4404.
SKD61 represents the Japanese standard designation for a 5% chromium hot-work die steel engineered for demanding thermal environments. In practical engineering and global steel trade, SKD61 is widely regarded as the Japanese counterpart of H13.
Because both grades share the same alloy design philosophy and target performance characteristics, they are commonly used for the same tooling applications.
Understanding the JIS Designation SKD61
The Japanese Industrial Standards system uses structured naming rules for tool steels.
SKD61 can be interpreted as follows:
- SK — Steel Kougu (tool steel)
- D — Indicates die steels used in molds and forming tools
- 61 — Numerical identifier for this specific hot-work grade within the JIS standard
This naming convention categorizes SKD61 as a hot-work die steel intended for elevated-temperature forming operations.
Comparación de la composición química
Although H13 and SKD61 are closely matched, their standards specify slightly different composition ranges.
| Elemento | AISI H13 (%) | JIS SKD61 (%) |
| Carbono (C) | 0,32 – 0,45 | 0.32 - 0.42 |
| Manganeso (Mn) | 0.20 - 0.60 | ≤ 0.50 |
| Silicio (Si) | 0,80 – 1,25 | 0.80 - 1.20 |
| Cromo (Cr) | 4.75 - 5.50 | 4.50 – 5.50 |
| Molibdeno (Mo) | 1.10 – 1.75 | 1.00 – 1.50 |
| Vanadio (V) | 0.80 - 1.20 | 0.80 - 1.20 |
| Otro | Ni+Cu ≤ 0.75 | Ni ≤ 0.25; Cu ≤ 0.25 |
The overall alloy design remains very similar, which explains why the two grades are typically treated as functional equivalents in international engineering practice.
Are H13 and SKD61 Identical?
In metallurgical terms, steel grades defined by different national standards are rarely perfectly identical.
H13 is defined under American standards, while SKD61 is defined in the Japanese system. Each specification allows slightly different composition tolerances and testing requirements.
Because of these specification differences, the two materials are better described as equivalent grades rather than identical steels. In most industrial tooling applications, however, SKD61 can serve as the Japanese equivalent of H13.
Typical Applications of H13 / SKD61
Due to their balanced combination of toughness, hardenability, and thermal fatigue resistance, both grades are widely used in hot-work tooling environments. Common applications include:
- Die Casting: aluminum, magnesium, and zinc die-casting dies
- Extrusion: extrusion dies and tooling components
- Hot Forging: forging dies, inserts, and hot shears
- General Hot-Work Tooling: mandrels, punches, and forming tools exposed to cyclic heating
These applications require steels that maintain strength and structural stability under repeated thermal and mechanical stress.
Conclusión
SKD61 is the JIS equivalent of AISI H13 tool steel.
While the two grades are defined by different standards and contain minor specification differences, they share nearly identical alloy design and performance objectives.
As a result, SKD61 is widely recognized as the Japanese counterpart of H13 in global hot-work tooling applications.
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Preguntas frecuentes
In the Japanese Industrial Standard (JIS) system, the closest equivalent to AISI H13 is SKD61. Both are chromium-molybdenum-vanadium hot-work steels used for high-temperature applications.
“SK” refers to Steel Kougu (tool steel), “D” indicates die steels for molds, and “61” is the specific numerical identifier for this hot-work grade.
No, they are considered equivalent grades rather than identical steels. While they share similar alloy designs, each national standard allows for slightly different composition tolerances and testing requirements.
Both contain roughly 5% chromium with similar levels of carbon, silicon, and vanadium. However, H13 allows a slightly higher range for Manganese and Molybdenum compared to SKD61.
SKD61 is widely used for die-casting dies, extrusion tooling, and hot-forging components. It is engineered to maintain strength under repeated thermal and mechanical stress.
SKD61 is specified under the Japanese Industrial Standard JIS G 4404. It is widely recognized in global trade as the functional counterpart to the American H13 grade.
They are used interchangeably because they share the same alloy design philosophy and target performance characteristics. Both provide a balanced combination of toughness, hardenability, and thermal fatigue resistance.