M7 (high-performance high-speed steel alloy for high-speed machining tool steel material) is an improvement of M2 and is recommended for use in high-speed applications. M7 is also recognized for its well-balanced blend of hardness, wear and high-temperature resistance, making it perfect for guides and dies used in high-pressure environments and in cutting tools, drills and industrial knives.
We have advanced M7 high-speed steel that works superbly at extreme heat and stress; it offers better resistance to thermal fatigue and wear. It is commonly used in industries that demand precision and durability, such as aerospace, automotive, and tooling industries.
| ZEICIN Grade | GB | AISI | JIS | DIN |
|---|---|---|---|---|
| M7 | W2Mo9Cr4V2 | M7 | SKH58 | 1.3348 / HS2-9-2 |
| C | Mn | P | S | Si | Cr | Mo | V | Co | W |
| 0.95-1.05 | 0.15-0.40 | ≤0.03 | ≤0.03 | ≤0.70 | 3.50-4.50 | 8.20-9.20 | 1.75-2.20 | - | 1.50-2.10 |
| Process | Parameters | Result / Performance |
|---|---|---|
| Soft Annealing | Heated to 820-880°C , then slowly cooled in furnace | Good machinability; Brinell hardness 230-280 HB |
| Hardening | Preheated at 450-600°C → heated to 850°C → then 1050°C → austenitized at 1180-1220°C ; quenched in oil, air, or warm water at 550°C | Hardness 64-66 HRC |
| Tempering | Tempered 3 times at 540-560°C , 1 hour each | Hardness remains ≥64 HRC |
| Forging | Hot working temperature range 1100-900°C | Suitable for hot forming |
| Performance After Heat Treatment | 1. High Hardness : up to 64-66 HRC , excellent wear resistance 2. Improved Toughness : good crack resistance after tempering 3. Good Machinability : easy to machine in annealed condition | Excellent overall properties |
M7: Very high wear resistance, high toughness, and excellent edge stability. It is widely used in industrial applications:
Cutting Tools: Low-cost and high-precision for gear cutting tools, drills, milling cutters, taps & dies with long tool life.
Thread cutting and forming: Used for thread cutting drills and cold forming tools for durability and edge toughness.
Heavy Construction Drills: Perfect for heavy-duty drills requiring extended life and high flexibility.
Punch and Die: Good punching tools and dies, wear resistance, high strength, and high impact.
The Properties of the welding tool: Tool repair - repair of punch faces with preheated molding tools with high wear resistance.
Q4: What is your product packaging like?
A4: Our products are packaged accordingly in standard industrial packaging to ensure safety during transport. If you have special packaging requirements, please specify them when placing your order, and we will package your items accordingly.
Q5: What payment methods do you support?
A5: We accept a variety of payment methods, including T/T, L/C, Alipay, PayPal, etc. The specific payment method can be arranged flexibly based on the order amount and customer needs.