Free Engineering Tool
Hardness Converter
Convert between Rockwell C, Rockwell B, Vickers (HV), and Brinell (HBW) hardness scales using ASTM E140 standard conversion data.
Convert Hardness Value
Common Mold Tool Steels
Reference table for tool steels commonly used in injection mold construction.
| Steel | DIN | HRC Range | Typical Use |
|---|---|---|---|
| P20 | 1.2311 | 28 to 34 | General purpose mold base, low volume production |
| P20+Ni (718) | 1.2738 | 28 to 36 | Larger molds, better polishability than P20 |
| H13 | 1.2344 | 44 to 52 | High production, die casting, hot runner components |
| S136 / 420SS | 1.2083 | 48 to 54 | Corrosive resins (PVC, POM), medical, optical |
| NAK80 | N/A | 38 to 42 | Pre-hardened, mirror polishable, medium production |
| S7 | N/A | 54 to 56 | Shock resistant, cam and lifter components |
| M2 (HSS) | 1.3343 | 60 to 65 | Wear inserts, gate inserts, high-wear areas |
| D2 | 1.2379 | 58 to 62 | Wear resistant inserts, trimming dies |
| A2 | 1.2363 | 57 to 62 | Trim steels, wear components |
| 2316 | 1.2316 | 28 to 34 | Pre-hardened stainless, corrosive materials |
Understanding Hardness Scales
Rockwell C (HRC)
The most common scale for hardened tool steels. Used for mold cores, cavities, and inserts. Range: 20 to 68 HRC. Higher values indicate harder, more wear resistant steel.
Rockwell B (HRB)
Used for softer steels and non-ferrous metals. Typical range: 70 to 100 HRB. Common for pre-hardened mold bases like P20 in the as-received condition.
Vickers (HV)
A versatile scale that works across a wide hardness range. Uses a diamond pyramid indenter. Particularly useful for thin sections and surface hardness measurements.
Brinell (HBW)
Uses a tungsten carbide ball indenter. Best for softer materials and large parts. The 3000 kg load is standard for steels. Good for verifying incoming mold base hardness.
Choosing the Right Steel?
Expert Steel Selection Guidance
The right steel choice affects mold life, cycle time, and total cost of ownership. Our engineers can recommend the optimal steel grade for your application.