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1.2824
Qilu
DIN 70MnMoCr8 (also designated as 1.2824) is a premium air-hardening cold-work tool steel standardized under EN 17350. Its balanced medium-high carbon content combined with manganese, chromium, and molybdenum delivers a distinctive combination of high hardenability, excellent wear resistance, and good toughness—properties that are often challenging to achieve simultaneously in tool steels.
Unlike conventional oil-or water-hardening grades, 70MnMoCr8 achieves its target hardness through air cooling after austenitization. This air-hardening characteristic significantly reduces the risk of distortion and cracking during heat treatment, making it particularly suitable for tools with complex geometries or tight dimensional tolerances.
Country | ISO | Germany |
Standard | ISO 4957 | DIN17350 |
Grade | 70MnMoCr8 | 70MnMoCr8/1.2824 |
Grade | C | Si | Mn | P | S | Cr | Mo |
70MnMoCr8/1.2824 | 0.65-0.75 | 0.10-0.50 | 1.80-2.50 | 0.030Max | 0.030Max | 0.90-1.20 | 0.90-1.40 |
Surface hardness and hardenability
Heat Treatment | Hardness |
Annealed (+A) | HB248Max |
| Hardening and Tempering (+HT) | HRC58 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
Annealing: Heat to 760–780°C, hold, then furnace cool slowly to soften structure and improve machinability.
Quenching: Heat to 825–845°C in salt bath, then air quench for uniform hardness and minimal distortion.
Tempering: Temper at 170–190°C, then cool in water or oil to relieve stress and stabilize performance.
Above curve in figure is a rough guide to the tempering behaviour of steels.
Melting Routes: EF + LF + VD / EAF + LF + VD / EF + LF + VD + ESR
Forging Parameters:
Preheat: 650–750°C
Start forging: 1050–1100°C
Finish forging: ≥850°C
Cool: furnace cooling to avoid cracking
EN 10228‑3 Class III
SEP 1921‑84 D/D
Ensures internal soundness for high‑reliability tooling.
Product type | Size range | Length |
Hot rolled bar | Φ10-Φ190mm | 2000-5800mm |
Hot forged bar | Φ200-Φ600mm | 2000-5800mm |
Hot rolled plate/sheet | T:10-60mm; W:310-810mm | 2000-5800mm |
Hot forged plate | T:70-250mm; W:310-810mm | 2000-5800mm |
Hot Forged block | T: 260-500mm; W: 300-1000mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
For 1.2824 steel, because we don’t use them in domestic market, so there is no stocks for that material.
Achieves high hardness in air, reducing distortion and cracking vs. oil/water quenching.
Uniform hardness through large sections, ideal for heavy‑section dies and tools.
Resists abrasion in high‑cycle stamping, shearing, and forming.
Withstands impact and shock without chipping or breaking.
Maintains hardness at elevated temperatures for stable long‑term use.
Minimal warpage in heat treatment, lowering rework costs.
70MnMoCr8 / 1.2824 is an air-hardening cold-work tool steel known for its excellent wear resistance, good toughness, and high hardenability. Its key properties make it suitable for demanding applications where resistance to abrasion, pressure, and deformation is critical. Typical applications include:
Blanking & piercing dies (medium‑heavy duty)
Forming rolls, bending dies, drawing dies
Shear blades, slitter knives, slitter rings
Cold forging dies, trimming tools
Injection molds for abrasive filled plastics
Compression molds, extrusion parts
Precision gauges, measuring tools
High‑wear machine parts, wear plates
Wear rings, guide rails, rollers
| Property | 1.2824 (70MnMoCr8) | 1.2842 (90MnCrV8) | O2 (AISI) | D2 (AISI) |
| Hardening | Air | Oil | Oil | Oil |
| Hardness (HRC) | ≥58 | 58–62 | 58–62 | 60–64 |
| Toughness | Good | Medium | Medium | Low |
| Wear Resistance | Very good | Good | Good | Excellent |
| Distortion | Low | Medium | Medium | High |
| Best For | Heavy‑duty cold work, high impact | Medium stamping, knives | General cold work | High wear, low impact |
Superior toughness + wear resistance vs. high‑carbon D2; more stable and less distortion vs. oil‑hardening O2 / 1.2842.
A1: Air-hardening steels develop full hardness when cooled in still air, eliminating the need for oil or water quenching. This minimizes distortion, reduces the risk of cracking, and allows for safer, more consistent heat treatment of complex-shaped tools.
A2: 70MnMoCr8 offers a good balance between wear resistance and toughness. Compared to D2 (high carbon, high chromium), it provides better toughness with slightly lower wear resistance. Compared to A2, it has comparable hardenability with a different alloy balance. It is often chosen when European specifications are required or for applications where both wear resistance and impact strength are needed.
A3: Yes, in the annealed condition (≤248 HB), 70MnMoCr8 has good machinability. Carbide tooling is recommended for high-volume operations, while high-speed steel tools are suitable for general machining.
A4: Welding is generally not recommended for tool steel components due to the risk of cracking and loss of hardness in the heat-affected zone. If repair welding is unavoidable, preheating, specialized electrodes, and post-weld heat treatment are required—consult a welding engineer for specific procedures.
Contact & Inquiry: For prices, delivery, specifications, or heat treatment advice about 1.2824 / 70MnMoCr8, please contact our sales team. We provide full material certificates and customized solutions for your tooling projects.
