H19
Data under reviewH19 is a tungsten-cobalt hot work steel with red hardness well beyond the 5% chromium family. It serves the hottest die positions — brass extrusion and severe hot heading — where H13 softens too fast.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.35–0.45 |
| Si | 0.20–0.50 |
| Mn | 0.20–0.50 |
| Cr | 4.00–4.75 |
| W | 3.75–4.75 |
| V | 1.65–2.25 |
| Co | 4.00–4.75 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Working hardness | 40–52 HRC |
| Density | 8.00 g/cm³ |
| Hot hardness | Very high (cobalt-bearing) |
Heat treatment
Harden 1100–1150 °C air/oil; double temper 550–650 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | H19 |
Compare side by side: H19 vs H21 · H19 vs H13
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Brass and copper extrusion dies, hot heading dies, extrusion liners and stems, hot punches.
Processing: High hardening temperatures need atmosphere control; expensive and less tough than H13, so reserve it for genuinely hot contact zones.
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Ask for a quotationVisit NasteelSource: ASTM A681 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.