M7 high-speed steel (DFM7, W2Mo9Cr4V2, SKH58, 1.3348) is a premium tool steel known for high toughness, wear resistance, and thermal stability. With 62–63 HRC hardness, it excels in cutting tools and precision components under high-speed and high-temperature conditions.
Widely used in industry, M7 combines high carbon, tungsten, molybdenum, chromium, and vanadium for balanced hardness, toughness, and red hardness, suitable for both standard and heavy-duty machining.
Cutting tools for metalworking and precision machining, including drills, milling cutters, and saw blades
Sendzimir rolls for rolling mills
Segment and circular cutters for industrial manufacturing
Profile cutting tools for complex geometries
Thread cutting drills for high-strength materials
Cold forming tools for sheet metal shaping
Heavy-duty construction drills require flexibility and extended service life
| ZEICIN Grade | GB | AISI | JIS | DIN | Erasteel | Bohler |
| DFM7 | W2Mo9Cr4V2 | M7 | SKH58 | 1.3348 | EM7 | S400 |
| Elemnet | C | W | Mo | Cr | V | Co | Al | Mn | Si | S | P |
| Contene(%) | 0.95-1.05 | 1.50-2.10 | 8.20-9.20 | 3.50-4.50 | 1.75-2.20 | – | – | 0.15-0.40 | ≤0.70 | ≤0.03 | ≤0.03 |
Softens M7 steel (HB ~255), reduces internal stresses, and enhances machinability prior to hardening.
Heat to 1190–1220 °C followed by rapid cooling to achieve high hardness and wear resistance.
Post-quenching tempering at approximately 550 °C balances hardness and toughness while alleviating residual stresses.
ZEICIN Steel is a leading manufacturer of M7 high-speed steel (DFM7 / W2Mo9Cr4V2 / SKH58), offering hot-rolled and hot-forged products with superior wear resistance, toughness, and thermal stability. We provide bulk supply and fully customizable sizes to meet diverse tooling, cutting, and industrial applications.
| Type | Specification（mm) | Surface Condition |
| Cold-drawn Round Steel | φ1-12 | Black/Centerless Surface |
| Hot-rolled Round Steel | φ12-60 | Turned Surface |
| Precision Forged Round Steel (Spray Forming) | φ60-300+ | Turned/Peeled Surface |
Different surface conditions affect appearance, dimensional accuracy, and machining allowance. The images below show common delivery options (actual products may vary by size and batch).
ZEICIN STEEL invests in R&D for high-speed steels and martensitic stainless steels. Our focus is on cleaner steel, more uniform carbide distribution, and stable heat-treatment response to support longer service life and better batch consistency.
Our company research and development team：Our company is one Member of the key project of “the 13th five-year plan ”of the National ministry of science and technology, Our company enjoys National government support and financial subsidies.
Together with Shanghai University and a Beijing-based steel research institute, we have developed a rapid-solidification electroslag remelting (RS ESR) process route. This process helps improve steel cleanliness and carbide uniformity, supporting longer tool life and more stable performance.
We work with Baosteel Group on spray forming technology. Our team supports process development and engineering validation for spray-formed HSS, helping meet high-performance material development and scale-up needs.
Yes. We are a factory. ZEICIN STEEL produces high-quality, cost-effective special steels, including stainless steel, tool & die steel, and high-speed steel. We also have our own import/export license, so we can serve overseas customers directly and support stable supply with batch traceability.
Yes. For first-time cooperation, we can provide a limited quantity of samples for verification (such as grade confirmation, machining trials, or heat-treatment evaluation). Samples can be shipped by international courier, and the courier cost is paid by the buyer. We value honest cooperation and look forward to a long-term win-win partnership.
Our common international payment methods include T/T and L/C. For trade terms, we can also support options such as DDU based on the order. The final payment method and terms can be confirmed according to your country/region, order value, and delivery method.
Our products use standard industrial packaging to ensure safe transportation. If you need custom packaging, please let us know when placing your order.
If the products are in stock, delivery usually takes 5–7 days.
If the products are not in stock, delivery time is about 30–40 days, depending on the order quantity.
