George Metals, located in Houston, USA, is a reliable manufacturer and supplier of top-notch High Speed Steel (HSS) M42 Bars, celebrated for their remarkable hardness, wear resistance, and toughness. M42 is a cobalt-rich high-speed steel alloy that delivers outstanding cutting performance, even at high temperatures, making it perfect for tough machining and tooling tasks. Adhering to industry standards like ASTM A600, George Metals offers M42 bars in a variety of diameters and lengths, employing precise heat treatment processes to enhance hardness and toughness. Our bars find extensive use in cutting tools, drills, milling cutters, and industrial blades.
High-Speed Steel M42 Bars consist of about 1.05% Carbon, 4.0% Molybdenum, 8.0% Cobalt, 2.0% Vanadium, and 1.0% Tungsten. With small quantities of Chromium and Manganese, the composition is particularly suitable for M42 to provide for the ultimate hardness and wear resistance. For cutting tools and industrial fields, this has been demonstrated to be optimal. The mechanical properties include a high Rockwell hardness of 68-70 HRC, good toughness, and also provides excellent resistance to thermal softening at elevated temperatures. M42 retains excellent edge retention even under high-stress conditions, providing superior performance in demanding machining tasks. Its strength and durability make it a preferred choice in high-performance tooling.
| ASTM A600 | C | Mn | P | S | Si | Cr | V | Mo | W | Co | ||||||||
| M42 | 1.05 | 1.15 | 0.15 | 0.40 | 0.03 | 0.03 | 0.15 | 0.65 | 3.50 | 4.25 | 0.95 | 1.35 | 9.00 | 10.00 | 1.15 | 1.85 | 7.75 | 8.75 |
| DIN ISO 4957 | C | Mn | P | S | Si | Cr | V | Mo | W | Co | ||||||||
| 1.3247/HS2-9-1-8 | 1.05 | 1.15 | … | … | … | … | … | 0.70 | 3.50 | 4.50 | 0.90 | 1.30 | 9.00 | 10.00 | 1.20 | 1.90 | 7.50 | 8.50 |
| JIS G4403 | C | Mn | P | S | Si | Cr | V | Mo | W | Co | ||||||||
| SKH59 | 1.05 | 1.15 | … | 0.40 | 0.03 | 0.03 | … | 0.70 | 3.50 | 4.50 | 0.90 | 1.30 | 9.00 | 10.00 | 1.20 | 1.90 | 7.50 | 8.50 |
| Mechanical Properties | Metric | Imperial |
| Hardness, Rockwell C (oil quenched from 1204°C, 5 minutes) | 64.3 | 64.3 |
| Hardness, Rockwell C (oil quenched from 1177°C, 5 minutes) | 65.5 | 65.5 |
| Hardness, Rockwell C(oil quenched from 1163°C) | 65.8 | 65.8 |
| Izod impact unnotched (oil quenched at 1191°C; 510°C temper temperature) | 13.6 J | 10.0 ft- lb |
| Izod impact unnotched (oil quenched at 1191°C; 622°C temper temperature) | 24.4 J | 24.4 J |
| Machinability (1% carbon steel) | 35.0 – 40.0% | 35.0 – 40.0% |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elastic modulus | 190-210 GPa | 27557-30457 ksi |
| Country | USA | German | Japan |
| Standard | ASTM A600 | DIN EN ISO 4957 | JIS G4403 |
| Grades | M42 | 1.3247/HS2-9-1-8 | SKH59 |
HSS M42 bars are used for the manufacturing of cutting tools like drills, end mills, and saw blades because of their exceptional hardness, wear resistance, and heat resistance. The cobalt content in M42 improves red-hardness, meaning that the tool remains sharp at elevated temperatures, which makes it ideal for high-speed machining and metalworking applications. These bars are further used in die, mold, and tap making, especially when high toughness along with durability is required for heavy duty applications. Such resistance to wear and thermal damage makes M42 a popular steel alloy in applications like aerospace, automotive, and tool-making industries.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
George Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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