| Standard: | DIN, JIS, AISI, ASTM, GB, BS |
|---|---|
| Technics: | Forged |
| Application: | Structural Steel Bar |
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| 4340 Steel | ||||||||||
| Equivalent grades | GB | DIN | AISI | JIS | ||||||
| 40CrNiMoA | 1.6582 | 4340 | SNCM8 | |||||||
| Chemical Composition | C | Si | Mn | Cr | Mo | Ni | P | S | ||
| 0.38-0.43 | 0.15-0.35 | 0.60-0.80 | 0.70-0.9 | 0.20-0.30 | 1.65-2.00 | 0.03max | 0.03max | |||
| Available size | Round Bar | Diameter | Length | |||||||
| 70-600mm | 2000-6000mm | |||||||||
| Flat Bar | Thickness | Width | Length | |||||||
| 25-400mm | 200-800mm | 2000-6000mm | ||||||||
| Surface condition | Black surface/ Grinded/ Machined | |||||||||
| Annealed hardness | HBS≤248 | |||||||||
| Characteristics | special alloy steel, supplied in quenched and tempered conditions. High strength and tenacity, good hardenability. | |||||||||
| Applications | heavily loaded parts for mechanical engineering and motor construction. | |||||||||
| Heat Treatment | Forging | Heat to 1150ºC Hold till uniform.Minimum forging temperature 850ºC.Cool slowly in ashes or sand etc. | ||||||||
| Annealing | Heat to 830ºC-850ºC.Cool infurnace. | |||||||||
| Stress Relieving | Annealed: Heat to 600ºC-650ºC.Hardened: Heat to 500ºC-550ºC.Cool in still air. | |||||||||
| Hardening | Heat to 830ºC-880ºC.Quench in oil or polymer. | |||||||||
| Tempering | Heat to 450ºC-660ºC cool in still air NB. Tempering within the range 250ºC-450ºC will result in temper brittleness and should be avoided. | |||||||||
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