M35 High Speed Steel Powder Metallurgy steels

Goelsteel > M35 High Speed Steel Powder Metallurgy steels

Grade Brief

Goel Steel Company is a leading supplier and stockist of M35 High Speed Steel Powder Metallurgy steels across India. Known for its cobalt-enriched composition, M35 exhibits excellent red hardness and high tempering resistance, making it well-suited to applications where thermal stress and discontinuous cutting are frequent. M35 is extensively used in heavy-duty milling cutters, high-stress twist drills, taps, profile knives, and broaches, especially for machining high-strength materials.

As a versatile high-speed steel of the molybdenum type, M35 (DIN 3243, AISI M35) balances toughness, wear resistance, and red hardness. With properties like increased bending strength, toughness, and thermoplasticity—50% higher than T1—M35 High Speed Steel Powder Metallurgy steels have become the preferred alternative to T1 in numerous applications. For enhanced performance, tools made from this steel can be coated with materials such as titanium nitride and titanium carbide through physical vapor deposition.

Mode of Supply

Goel Steel offers M35 High Speed Steel Powder Metallurgy steels in various profiles, including flat, square, and round bars. Available in multiple sizes, our inventory is tailored to meet diverse customer needs. Contact our team for any inquiries on specific shapes or dimensions.

Steel Properties

M35’s cobalt content delivers outstanding red hardness and tempering resistance, making it ideal for high-thermal stress applications. Under the names this grade may include a higher sulfur content (S = 0.10%) for specialized uses.

Mechanical Properties

Tensile Strength
Yield Strength
Elongation
Impact Toughness
Hardness
Modulus of Elasticity
481 MPa
419 MPa
34%
12 KV/Ku (J)
421 HBW
207 GPa

Heat Treatment & Processes

Heat Treatment

The heat treatment for M35 High Speed Steel Powder Metallurgy steels depends on factors like component size, furnace type, quenching medium, and specific heating/cooling conditions.

Hardening

Preheat in two stages (450–500°C and 820–870°C), then heat to a hardening temperature of 1050–1250°C. Hardening in a controlled furnace or vacuum is ideal, although a precisely regulated salt bath is also effective.

Quenching

Suitable media include heated oil, pressurized gas, or salt baths. For pressurized gas quenching, a rapid cool to below 1000°F (538°C) is essential. Oil quenching should occur at 900°F (482°C) or when the material darkens, followed by air cooling.

Tempering

After quenching, temper within 510–620°C. Multiple tempering cycles are recommended for high durability.

Forging

Preheat to 450–500°C, then raise to 950–1100°C. Avoid forging below 950°C and allow slow cooling.

Stress Relieving

After machining but before hardening, perform stress-relief at 600–700°C, holding for two hours to minimize distortion, followed by gradual cooling.

Annealing

For optimal machinability and prior to re-hardening, anneal by heating to 850°C at a maximum rate of 220°C/hour, holding for two hours, then allowing gradual cooling. The final hardness should be 260 Brinell or less.

Normalizing

M35 is provided in an annealed, machinable condition. If further shaping or forging is done, re-annealing may be required.

Welding

Specialized welding methods with preheating and filler materials matched to the base composition are used, with controlled cooling afterward.

DIN 1.2085 from Goel Steel Company is a versatile, corrosion-resistant steel that serves diverse applications. With its high toughness, easy machinability, and durability, 1.2085 steel is a valuable choice across many industries, especially for those needing reliable performance in challenging environments.

Soft Annealing

  • Temperature: 820 – 860°C
  • Cooling: Furnace
  • Hardness: Maximum 269 HB

Soft Stress-Relief Annealing

  • Temperature: 630 – 650°C
  • Cooling: Furnace

Hardening Cycle

  • Pre-heating: Up to 400°C, then 850°C and 1050°C
  • Hardening Temperature: 1190 – 1230°C
  • Quenching: Salt bath, oil, or air quenching at a minimum of 550°C
  • Tempering: Minimum twice at 540-570°C for a hardness of 64–67 HRC

Applications

M35 High Speed Steel Powder Metallurgy steels from Goel Steel Company are highly valued for a range of precision applications, including heavy-duty milling, twist drills, taps, profile knives, and other high-stress tools. These steels are ideal for producing cutting tools like broaches, reamers, milling cutters, punches, and dies with complex shapes and superior durability, meeting the high standards of thermal resistance and wear needed across industries.

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