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T: +86-0731-85185770
E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
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HS6-6-2
Qilu
Country | ISO | Germany | Japan |
Standard | ISO 4957 | DIN 10027-2 | JIS G4403 |
Grade | HS6-6-2 | 1.3350 | SKH52 |
Grade | C | Si | Mn | Cr | P | S | Mo | V | W |
| HS6-6-2/1.3350 | 1.00-1.10 | 0.45 Max | 0.40 Max | 3.80-4.50 | 0.030 Max | 0.030 Max | 5.50-6.50 | 2.30-2.60 | 5.90-6.70 |
| SKH52 | 1.00-1.10 | 0.45 Max | 0.40 Max | 3.80-4.50 | 0.030 Max | 0.030 Max | 5.50-6.50 | 2.30-2.60 | 5.90-6.70 |
Annealed (+A): ≤ HB 262
Quenched + Tempered (+HT): ≥ HRC 64
Pre‑hardened (+QT): HRC 28–32 (machining range)
1. Annealing
Heat to 850–880°C
Furnace cool ≤30°C/h to ~500°C, then air cool
Purpose: Improve machinability, relieve stress
2. Quenching & Tempering
Austenitize: 1190–1210°C (salt bath)
Quench medium: Oil
Temper: 550–570°C, air cool
Result: Peak hardness, red hardness, and dimensional stability
Above curve in figure is a rough guide to the tempering behaviour of steels.
Melting Routes: EF+LF+VD; EAF+LF+VD; EF+LF+VD+ESR (for high purity)
Forging: Start 950–1120°C; finish ≥900°C; furnace/sand cool
UT: EN 10228‑3 Level III; SEP 1921‑84 D/D
Certificates: Mill test certificate (MTC) per EN 10204 3.1
Product type | Size range | Length |
Hot rolled bar | Φ10-Φ190mm | 2000-5800mm |
Hot forged bar | Φ200-Φ600mm | 2000-5800mm |
Hot rolled plate/sheet | T:10-60mm; W:310-810mm | 2000-5800mm |
Hot forged plate | T:70-250mm; W:310-810mm | 2000-5800mm |
Hot Forged block | T: 260-500mm; W: 300-1000mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
To ensure optimal performance for your application, we produce 1.3350 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
Twist drills, step drills, deep‑hole drills for steel, cast iron, alloy steel
End mills, slotting cutters, form cutters, saw blades
Taps, dies, threading cutters
Hobs, shaper cutters for medium‑volume gear production
Reamers, broaches for high‑precision bores, splines, keyways
| Property | 1.3350 / SKH52 | M2 / 1.3343 | M35 (HSS‑E) |
| Alloy Type | W‑Mo‑V balanced | General W‑Mo | Co‑bearing high‑heat |
| Hardness | HRC 64–66 | HRC 62–65 | HRC 65–68 |
| Red Hardness | Very good | Good | Excellent |
| Wear Resistance | High (high V) | Medium‑high | Very high |
| Toughness | Good | Very good | Moderate |
| Grindability | Excellent | Good | Fair |
| Cost | Medium | Low‑medium | High |
| Best For | General tools, drills, taps, reamers | Mass‑market tools | High‑temp / hard alloys |
A1: Yes. 1.3350 (DIN) and SKH52 (JIS) are fully equivalent with matching chemistry and performance.
A2: After proper quenching and tempering, ≥ HRC 64, typically HRC 64–66.
A3: Quench 1190–1210°C (oil) + temper 550–570°C (air cool). Double temper recommended for stability.
A4: ESR improves purity, reduces inclusions, boosts toughness and fatigue life – recommended for precision tools.
A5: In many cases yes. It offers higher wear resistance and red hardness for longer tool life at similar toughness.
Contact us for quotation, lead time, sample, or custom specification of 1.3350 / HS6‑6‑2 / SKH52 high‑speed tool steel.
