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

Product Features

Chemical Composition

Hardness & Hardenability

Physical Property Supplement:

• Density of 1.3339 HS6-5-2: 8.16 g/cm³.

• After standard quenching and tempering, tensile strength reaches 2400–2700 MPa.

• It can maintain stable hardness above HRC 60 at 540°C, with excellent red hardness.

Production Process & Quality Inspection

Steel Making Process

Multiple smelting processes for selection, effectively reducing inclusions and improving material purity:

• EF+LF+VD

• EAF+LF+VD

• EF+LF+VD+ESR (Electroslag Remelting, for high-precision tools)

• EAF+LF+VD+ESR (Electroslag Remelting, for high-load molds)

Forging Process

• Forging Initial Temperature: 1100–1130°C

• Forging Final Temperature: 900–950°C

• Cooling Method: Furnace cooling (prevent internal stress and cracking)

Ultrasonic Testing

All materials pass non-destructive testing, standard: EN10228-3 Class III or Sep 1921-84 D/D, to ensure no internal cracks, pores and defects.

Heat Treatment

Heat treatment directly determines the final performance of high speed steel. We provide standardized processes for reference of heat treatment factories and tool manufacturers.

Annealing Process

• Heat the material to 870–900°C;

• Furnace slow cooling, cooling rate ≤ 20°C/h (recommended 10–20°C/h);

• Cool to 500–600°C naturally, then air cool to room temperature;

• Purpose: Reduce hardness, eliminate internal stress, facilitate turning, milling and drilling.

Quenching & Tempering

• Quenching: Heat to 1110–1130°C via salt bath furnace, then oil quenching;

• Tempering: Furnace tempering at 550–570°C, air cooling after heat preservation;

• Recommendation: Adopt double tempering or triple tempering to reduce retained austenite and avoid early failure of tools.

Tempering Hardness Curve Reference

When quenched at 1220°C and oil cooled, 1.3339 HS6-5-2 maintains high hardness within the tempering range of 500–600°C, and the hardness gradually decreases when the temperature exceeds 600°C. It is recommended to control the tempering temperature between 540–570°C to obtain the best combination of hardness and toughness.

Product Specifications, Delivery Sizes & Tolerance

Complete product form coverage, clear size range, tolerance and straightness standards, meeting the processing requirements of different scenarios.

Product Types & Size Range

Surface Finish, Dimensional Tolerance & Straightness

Service Note: We support customized non-standard sizes, special lengths and surface treatments. All products are produced on a make-to-order basis to ensure fresh material and stable quality.

Application

1. Complex Precision Cutting Tools

• Gear tools: Hobs, gear shapers, gear shaving cutters;

• Thread tools: Precision taps, threading dies, thread combs (for alloy steel and cast iron);

• Forming tools: Forming turning tools, complex forming milling cutters.

2. General-Purpose High-Performance Cutting Tools

• Drills: Twist drills, deep hole drills, center drills (for high-strength alloy steel and cast iron);

• Milling cutters: End mills, face mills, keyway cutters, T-slot cutters (semi-finishing & finishing);

• Reamers: High-precision hole reamers for high surface quality requirements;

• Broaches: Internal hole, keyway and spline broaches.

3. Special Heavy-Duty Cutting Tools

• Sawing tools: Metal circular saw blades, band saw blades (for profiles and thick-walled pipes);

• Lathe & planer tools: For single-piece and small-batch turning/planing of alloy steel.

4. Cold Work Dies & Wear-Resistant Parts

• Cold stamping dies: Punches and dies for medium-thickness plate stamping;

• Cold heading dies: For manufacturing high-strength fasteners;

• Precision measuring tools & wear-resistant accessories: Caliper gauges, plug gauges, wear-resistant bushings.

FAQ

Q1: Is 1.3339 the same as M2 / SKH51?

A1: Yes. 1.3339 (HS6-5-2), AISI M2, JIS SKH51 and GB W6Mo5Cr4V2 are equivalent high speed steel grades. Their chemical composition and mechanical performance are highly consistent, and they can be completely interchanged in most cutting tool and die applications. The only difference is compliance with different national industrial standards.

Q2: What is the hardness of 1.3339 high speed steel after heat treatment?

A2: After standard quenching and tempering, the hardness of 1.3339 reaches minimum HRC 64. Annealed state ≤ HB 262 (soft state for machining), quenched and tempered intermediate state HRC 28–32.

Q3: What materials can 1.3339 HS6-5-2 process?

A3: It is suitable for machining high-strength alloy steel, stainless steel, cast iron, heat-resistant alloy and other difficult-to-cut materials. It is widely used for high-speed cutting, intermittent cutting and heavy-load forming processing.

Q4: What are the main product forms of 1.3339?

A4: We supply hot rolled bars, hot forged bars, steel plates, forged plates and forged blocks. Multiple surface treatments such as turning, milling, grinding, peeling and black forging are available, with complete size ranges.

Q5: Does 1.3339 support customized production?

A5: Yes. All our 1.3339 high speed steel is made-to-order. We can customize non-standard sizes, special lengths, surface finishes and smelting processes (such as ESR electroslag remelting) according to customer requirements.

Q6: What testing standards does 1.3339 pass?

A6: All products pass ultrasonic non-destructive testing, compliant with EN10228-3 Class III or Sep 1921-84 D/D standards, to ensure no internal defects.

If you are looking for high-quality DIN 1.3339 HS6-5-2 high speed steel, equivalent SKH51, M2 and W6Mo5Cr4V2 materials, please contact us for detailed quotations, sample support and customized solutions.