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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
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70MnMoCr8 / 1.2824 is an air-hardening cold-work tool steel compliant with the European standard EN 17350. With a carbon content of 0.65–0.75%, this medium-high carbon alloy tool steel achieves high hardness even when cooled in air, while offering good toughness and excellent wear resistance.
Its superior hardenability, resistance to tempering softening, and dimensional stability make it a preferred choice for high-wear, impact-resistant tools. Commonly employed in heavy-duty forging dies, shear blades, forming dies, and wear-resistant mechanical components, 70MnMoCr8 delivers reliable performance and long service life in demanding tooling applications.
1: Steel equivalent
Country | ISO | Germany |
Standard | ISO 4957 | DIN17350 |
Grade | 70MnMoCr8 | 70MnMoCr8/1.2824 |
2: Chemical composition
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 |
3: Surface hardness and hardenability.
Heat Treatment | Hardness |
Annealed (+A) | HB248Max |
| Hardening and Tempering (+HT) | HRC58 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
4: Supply size & Tolerance & Stock size
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.
5: Ultrasonic Test
EN10228-3 class III or Sep 1921-84 D/D
6：Steel making & Forging processing
1): Steel making process:
EF+LF+VD
EAF+LF+VD
EF+LF+VD+ESR
EAF+LF+VD+ESR
2): Forging processing:
Pre-heat 1.2824 steel to 650-750℃
Initial temperature: 1050-1100℃
Final temperature: ≥850℃
Cooling in the furnace
7: Heat treatment
1): Annealed:
Heat 1.2824 steel to 760-780℃
Slowly cool in the furnace
2): Quenching and tempering:
Heat 1.2824 steel to 825-845℃ in the salt bath furnace
Quench in air
Temper steel at 170-190℃ in the furnace
Cooling in the water or in the oil.
Above curve in figure is a rough guide to the tempering behaviour of steels.
8：Application
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:
1. Cold Work Tools
Blanking and Piercing Dies: For medium-to-heavy duty operations
Forming Rolls and Dies: Used in metal forming processes
Shear Blades and Knives: For cutting metal materials
Slitter Rings: In metal coil processing lines
2. Plastic Molds
Injection Molds: For processing abrasive plastic materials (e.g., filled plastics)
Compression Molds
3. Other Applications
Gauges and Precision Tools
Machine Components subject to high wear
70MnMoCr8 / 1.2824 is an air-hardening cold-work tool steel compliant with the European standard EN 17350. With a carbon content of 0.65–0.75%, this medium-high carbon alloy tool steel achieves high hardness even when cooled in air, while offering good toughness and excellent wear resistance.
Its superior hardenability, resistance to tempering softening, and dimensional stability make it a preferred choice for high-wear, impact-resistant tools. Commonly employed in heavy-duty forging dies, shear blades, forming dies, and wear-resistant mechanical components, 70MnMoCr8 delivers reliable performance and long service life in demanding tooling applications.
1: Steel equivalent
Country | ISO | Germany |
Standard | ISO 4957 | DIN17350 |
Grade | 70MnMoCr8 | 70MnMoCr8/1.2824 |
2: Chemical composition
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 |
3: Surface hardness and hardenability.
Heat Treatment | Hardness |
Annealed (+A) | HB248Max |
| Hardening and Tempering (+HT) | HRC58 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
4: Supply size & Tolerance & Stock size
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.
5: Ultrasonic Test
EN10228-3 class III or Sep 1921-84 D/D
6：Steel making & Forging processing
1): Steel making process:
EF+LF+VD
EAF+LF+VD
EF+LF+VD+ESR
EAF+LF+VD+ESR
2): Forging processing:
Pre-heat 1.2824 steel to 650-750℃
Initial temperature: 1050-1100℃
Final temperature: ≥850℃
Cooling in the furnace
7: Heat treatment
1): Annealed:
Heat 1.2824 steel to 760-780℃
Slowly cool in the furnace
2): Quenching and tempering:
Heat 1.2824 steel to 825-845℃ in the salt bath furnace
Quench in air
Temper steel at 170-190℃ in the furnace
Cooling in the water or in the oil.
Above curve in figure is a rough guide to the tempering behaviour of steels.
8：Application
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:
1. Cold Work Tools
Blanking and Piercing Dies: For medium-to-heavy duty operations
Forming Rolls and Dies: Used in metal forming processes
Shear Blades and Knives: For cutting metal materials
Slitter Rings: In metal coil processing lines
2. Plastic Molds
Injection Molds: For processing abrasive plastic materials (e.g., filled plastics)
Compression Molds
3. Other Applications
Gauges and Precision Tools
Machine Components subject to high wear
