DIN HS6-5-2 1.3339 SKH51 M2 High Speed Tool Steel

HS6-5-2/1.3339 is a tungsten-molybdenum-vanadium alloy high-speed tool steel conforming to the German standard DIN EN ISO 4957. This material holds significant value in the fields of high-efficiency cutting and precision forming. With its good hot hardness, excellent wear resistance, and high resistance to temper softening, it is a preferred choice for machining medium-to-high strength and high wear-resistant workpieces. HS6-5-2 steel is particularly suitable for manufacturing high-performance cutting tools, such as drills, milling cutters, and threading tools used for processing alloy steels, cast iron, and certain heat-resistant materials. During continuous cutting and intermittent cutting operations with some degree of impact, this material maintains stable cutting edges, effectively improving machining efficiency and tool service life.

1: Steel equivalent

2: Chemical composition

3: Surface hardness and hardenability

4: Supply size & Tolerance & Stock size

To ensure optimal performance for your application, we produce 1.3339 high speed tool steel on a dedicated make-to-order basis. This approach guarantees fresh production and allows us to customize the process for your specific requirements. Tell us your needs, and let's get started.

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:  

Initial temperature: 1100-1130℃

Final temperature: 900-950℃

Cooling in the furnace

7: Heat treatment

1): Annealed:

Heat 1.3339 steel to 870-900℃

Cooling in the furnace. Slowly cool to approximately 500–600 °C at a cooling rate of ≤ 20 °C/hour (typically recommended at 10–20 °C/hour).

2): Quenching and tempering:  

Heat 1.3339 steel to 1110-1130℃ in the salt bath furnace

Quench in the oil

Temper steel at 550-570℃ in the furnace

Cooling in the air.

Above curve in figure is a rough guide to the tempering behaviour of steels.

8：Application

1.3339 high-speed steel is widely used in the manufacture of various high-performance cutting tools due to its excellent balance between hardness, wear resistance, red hardness, and toughness. Its typical carbide distribution makes it particularly suitable for machining applications requiring sharp cutting edges and a certain degree of impact resistance. The following are the main application areas and specific uses of 1.3339 high-speed steel:

1. Complex Precision Cutting Tools

• Gear Cutting Tools: Hobs, gear shapers, gear shaving cutters

• Threading Cutting Tools: Precision taps (especially for alloy steel and cast iron), dies, thread combs

• Forming Cutting Tools: Forming turning tools and forming milling cutters of various complex shapes

2. General-Purpose High-Performance Cutting Tools

• Drill Bits: Twist drills, deep hole drills, and center drills for machining high-strength alloy steel and cast iron

• Milling Cutters: End mills, face mills, keyway cutters, and T-slot cutters for semi-finishing and finishing steel and cast iron

• Reamers: Reamers for high-precision, high-surface-quality finishing of holes

• Broaches: Broaches for machining internal holes, keyways, splines, and other shapes

3. Special Purpose and Heavy-Duty Cutting Tools

• Sawing Tools: Metal circular saw blades and band saw blades for cutting profiles and thick-walled pipes

• Cutting Tools: Lathe tools and planer tools are used for turning and planing alloy steel in single-piece or small-batch production.

4. Cold work dies

• Cold stamping dies: punches and dies used for punching medium-thick plates.

• Cold heading dies: used to manufacture high-strength fasteners.

• Precision measuring tools and wear-resistant parts: such as caliper gauges, plug gauges, wear-resistant bushings, etc.