Available Shapes
EN19T Alloy Steel
EN19 is a chromium-molybdenum alloy steel. The chromium content provides good hardness penetration, and the molybdenum content ensures uniform hardness and high strength. EN19 chrome-molybdenum steel can be oil hardened to a relatively high level of hardness. The desirable properties of the EN19 include superior toughness, good ductility, and good wear resistance in the quenched and tempered conditions.
The EN19 cold finished annealed chromium-molybdenum alloy steel can be heated using various methods to yield a wide range of properties, hence it is often used as stock for forging as it has self-scaling properties. EN19 is capable of resisting creep in temperatures up to 538°C (1000°F) and maintaining its properties even after long exposure at comparatively high working temperatures.
The EN19 cold rolled rounds are available in the 4140 variant that contains 0.15-0.35 lead. The lead content improves machinability but has a significant effect on other desirable properties.
Applications
Analysis
Forging
Annealing
Hardening
Tampering
Typical Mechanical Properties*
Applications
AISI 4140 is used extensively in most industry sectors for a wide range of applications such as: Strippers bolts, axle shafts, tool bodies, bolsters holder blocks, stubs, crankshafts, tool holders, machinery parts and components, mold bases, couplings, connecting rods, tie rods, conveyor parts, ejectors, reamer bodies, chuck bodies, boring bars, crowbars, back up and support tooling, axles, collets, guides, logging parts, fixtures, piston rods, conveyor pins & rolls, tracks shafts, jigs rams, ejector pins, ways sprockets, molds, hydraulic machinery shafts, forks slides, studs, cams, gears, guide rods, wear strips or parts, pump shafts, drill collars, sprockets, torsion bars, forming dies, ring gears, gear racks, chain links, lathe spindles, brake dies, adapters, valves, spindles, logging parts, trim dies, arbors, milling spindles, motor shafts, pinch bars, pins, pinions, nuts, pump shafts, tool holders, sockets
Analysis
| Carbon | 0.35-0.45% | Silicon | 0.10-0.35% |
| Manganese | 0.50-0.80% | Phosphorous | 0.035% max |
| Chromium | 0.90-1.50% | Sulphur | 0.050% max |
| Molybdenum | 0.20-0.40% |
Forging
Pre heat carefully, then raise temperature to 850-1200°C for forging. Do not forge below 850°C. After forging cool slowly in still air.
Annealing
Heat the EN19T slowly to 680-700°C. Cool in air.
Hardening
This steel grade is commonly supplied ready heat treated. If further heat treatment is required annealed EN19 should be heated slowly to 860-890°C and after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature.
Tampering
Heat carefully to a suitable temperature selected by reference to a tempering chart or table. Soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will reduce the impact value.
Typical Mechanical Properties*
| Condition | Tensile N/ mm² | Yield N/mm² | Elongation % | Izod KCV J | Hardness Brinell |
|---|---|---|---|---|---|
| S | 775-925 | 585 | 13 | 22 | 223-277 |
| T | 850-1000 | 680 | 13 | 50 | 248-302 |
| U | 925-1075 | 755 | 12 | 42 | 269-331 |
(*subject to ruling section)
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