EN 19 is a chromium-molybdenum alloy steel offering a strong combination of tensile strength, toughness, ductility and wear resistance. It is widely used for highly loaded engineering and automotive components.
Available Forms: Round Bars | Flats | Blocks | Custom Sizes
Key Features
Strength Where Your Application Needs It
EN 19 — Technical Specifications
| Property | Specification |
|---|---|
| Material | EN 19 |
| Steel Type | Chromium-Molybdenum Alloy Steel |
| Common Designations | 709M40 / 42CrMo4 / SAE 4140* |
| Carbon (C) | 0.36–0.44% |
| Silicon (Si) | 0.10–0.35% |
| Manganese (Mn) | 0.70–1.00% |
| Chromium (Cr) | 0.90–1.20% |
| Molybdenum (Mo) | 0.25–0.35% |
| Phosphorus (P) | 0.035% Max* |
| Sulphur (S) | 0.050% Max* |
| Available Forms | Round Bars, Flats, Blocks* |
| Supply | Full Length / Cut-to-Size |
| Element | Typical Composition |
|---|---|
| Carbon (C) | 0.36–0.44% |
| Silicon (Si) | 0.10–0.35% |
| Manganese (Mn) | 0.70–1.00% |
| Chromium (Cr) | 0.90–1.20% |
| Molybdenum (Mo) | 0.25–0.35% |
| Phosphorus (P) | 0.035% Max |
| Sulphur (S) | 0.050% Max |
| Iron (Fe) | Balance |
6. Applications
Where En 19 Is Used
Gears & Pinions
For High-load Power-transmission Applications.
Shafts & Spindles
Suitable For Rotating Components Subjected To Mechanical Loads.
Axles & Drive Shafts
Used In Automotive And Heavy Engineering Applications.
Crankshaft Components
Suitable For Demanding Mechanical And Automotive Applications.
Bolts & Studs
Used Where High-strength Fastening Components Are Required.
Towing Pins & Tie Rods
Suitable For Heavily Loaded Mechanical Applications.
Oil & Gas Components
Used In Selected High-strength Engineering Applications.
EN 19 can be heat treated to obtain different combinations of hardness, strength and toughness. Published technical guidance includes annealing, normalizing, hardening and tempering treatments.
| Treatment | Typical Temperature | Purpose |
|---|---|---|
| Annealing | 680–700°C | Improves machinability and reduces hardness |
| Normalizing | 870–900°C | Refines structure and improves uniformity |
| Hardening | 840–890°C | Increases hardness and strength |
| Quenching | Oil | Develops hardened structure |
| Tempering | Application dependent | Balances hardness and toughness |
Round Bars
Suitable For Shafts, Gears, Pinions, Spindles And Machined Components.
Flats
For Engineering, Machining And Fabrication Requirements.
Blocks
Suitable For Manufacturing And Machining Applications.
Custom Sizes
Material Prepared According To Specified Dimensions, Subject To Availability.
Full Length
Available According To Tsi Metals’ Stock And Size Requirements.
Flexible Supply For Every Requirement
TSI Metals supplies EN19 in multiple conditions and formats to support machining, heat treatment and application-specific requirements.
Annealed
Suitable for machining and subsequent heat treatment.
Normalized
Used where a refined and more uniform microstructure is required.
Hardened & tempered
Suitable for applications requiring developed strength and toughness.
As-rolled
Available subject to stock and applicable specification.
Full length
Supplied according to available dimensions.
Cut-to-size
Prepared according to customer requirements.
EN19 is commercially available in different supply conditions, including rolled and heat-treated conditions.
Share your requirement with our team and get the right steel solution for your application.
