ENGINEERING STEELS + ALLOYS
| Interlloy Grade | Nearest Related Specification | Typical Composition (%) & Properties | Description & Applications | |||||
| C | Si | Mn | Ni | Cr | Mo | |||
| 300M | DIN 1.6928 UNS K44220 ASTM A579, A646 AMS 6417, 6419AMS MIL S-8844D, S-8844 Class 2 |
0.38 | 1.45 | 0.60 | 1.65 | 0.70 | 0.30 | Low alloy vacuum melted steel of very high strength. It is a modified AISI 4340 with silicon, vanadium and slightly highercarbon and molybdenum content than 4340. |
| 4140 | AS1444-1996 4140 BS970-1955 EN19A BS970 Part 3-1991 709M40 ASTM A29/29M 1991 4140 SAE/AISI 4140 |
0.41 | 0.30 | 0.85 | 1.0 | 0.20 | General purpose high tensile steel for components, such as axles, shafts, bolts, gears and drill rods. | |
| 4145H | API Spec 7 SAE J1268 UNS H41450 ASTM A304 |
0.42 | 0.15 | 0.65 | 0.75 | 0.15 | Chromium/Molybdenum high tensile steel that has good ductility, shock resistance and wear resistance. | |
| 4340 | AS1444-1996 4340 BS970-1955 EN24 BS970 Part 3-1991 817M40 ASTM A29/29M 1991 4340 SAE/AISI 4340 |
0.41 | 0.25 | 0.70 | 1.80 | 0.80 | 0.25 | Highly stressed components such as gears. Alternative to EN25, EN26 in smaller sizes. |
| EN25 | AS1444-1996 X9931 BS970-1955 EN25 BS970 Part 3-1991 826M31 |
0.31 | 0.30 | 0.60 | 2.50 | 0.65 | 0.50 | Highly stressed shafts and gears in larger sizes. |
| EN26 | AS 1444-1996 X9940 BS970-1955 EN26 BS970 Part 3-1991 826M40 |
0.40 | 0.30 | 0.60 | 2.50 | 0.65 | 0.50 | As EN25 and also suitable where high surface pressure exists. |
