708M40 / EN19T
High tensile strength, good machinability and weldability.
A versatile low alloy steel that possesses good tensile and shock resistance properties combined with ductility. Its resistance to wear can be considerably increased by flame hardening and it is also suitable for nitriding (for maximum wear and abrasion resistance). Bars are often supplied in the hardened and tempered condition with a tensile strength range of 850-1000N/mm2• The bars are readily machinable so that the components can be put into service without the cost of further treatment. Bars can also be supplied in the softened state which require hardening and tempering but will give increased machinability
| C | Si | Mn | S | P | Cr | Ni* | Mo | |
|---|---|---|---|---|---|---|---|---|
| Min | 0.36 | 0.10 | 0.70 | 0.90 | 0.15 | |||
| Max | 0.44 | 0.35 | 1.00 | 0.040 | 0.035 | 1.20 | 0.40 | 0.25 |
(* denotes residual element)
| Test Type | Tensile and Hardness test (at room temperature) | Impact test (KV) | ||||||
|---|---|---|---|---|---|---|---|---|
| Yield (Re) | 0.2% proof | UTS (Rm) | Elong (A) | R of A (Z) | Hardness | Room Temp | ||
| unit | N/mm2 | N/mm2 | N/mm2 | % | % | HB | J | |
| Annealed | Min | |||||||
| Max | 235 | |||||||
| Q + T + Drawn, condition 'T' | Min | 700 | 850 | 9 | 248 | 50 | ||
| Max | 1000 | 302 | ||||||
| Q + T to condition 'Q' | Min | 480 | 625 | 18 | 179 | 16 | ||
| Max | 775 | 229 | ||||||
| Q + T to condition 'R' | Min | 495 | 700 | 15 | 201 | 28 | ||
| Max | 850 | 255 | ||||||
| Q + T to condition 'S' | Min | 585 | 775 | 15 | 223 | 50 | ||
| Max | 925 | 277 | ||||||
| Q + T to condition 'T' | Min | 680 | 850 | 13 | 248 | 50 | ||
| Max | 1000 | 302 | ||||||
• Grade 7-8M40
• Condition: Untreated/ Annealed/ Quench and tempered
• Surface Finish: As rolled/ As forged/ Bright drawn/ Bright turned
• Standard: BS970
• Applications: Axle shafts, crankshafts, gears, induction hardened pins
| Size Range Summary | ||
|---|---|---|
| Rounds | IMP | 3/8" - 3" dia |
| MM | 10mm - 310mm dia | |
| Properties | |
|---|---|
| MACHINEABILITY | 40 |
| WELDABILITY | Pre / post heat precaution required |
| HARDENABILITY | High strength up to 100mm dia |
| SELECTION GUIDEAND USAGE EXAMPLES | Popular direct hardening steel with good tensile. ductility, shock and wear resistance properties |
Please get in touch with us for stock availability and specific sizes.
