| 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.Characteristics 1. Widely used plastic mold steel with excellent comprehensive mechanical properties, high hardenability, uniformed hardness throughout section for large size steel after quenching and tempering. 2. With good polishing ability and low toughness. 3. To be used directly after pre-hardening, guarantee good usability and avoid deformation after heat treatment for the mold. |
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| Applications | heavily loaded parts for mechanical engineering and motor construction. 1. Suitable for making oversized or large size plastic molds with high precision and long service life. 2. Used for making low melting-pointed alloyed die casting moulds, like Tin, Zinc, Lead. |
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| 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. | |||||||||
| C | Si | Mn | P | S | Cr | Mo | Ni | ||||||||
| 0.35 | 0.20 | 1.30 | ≤ | ≤ | 1.80 | 0.15 | 0.90 | ||||||||
| 0.45 | 0.40 | 1.60 | 0.030 | 0.030 | 2.10 | 0.25 | 1.20 |
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