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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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HS6-5-4
Qilu
Country | ISO | Germany | Japan |
Standard | ISO 4957 | DIN 10027-2 | JIS G4403 |
Grade | HS6-5-4 | 1.3351 | SKH54 |
Grade | C | Si | Mn | Cr | P | S | Mo | V | W |
| HS6-5-4/1.3351 | 1.25-1.40 | 0.45 Max | 0.40 Max | 3.80-4.50 | 0.030 Max | 0.030 Max | 4.20-5.00 | 3.70-4.20 | 5.20-6.00 |
| SKH54 | 1.25-1.40 | 0.45 Max | 0.40 Max | 3.80-4.50 | 0.030 Max | 0.030 Max | 4.20-5.00 | 3.70-4.20 | 5.20-6.00 |
Heat Treatment | Hardness |
Annealed (+A) | HB269Max |
| Hardening and Tempering (+HT) | HRC64 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
Performance Advantage: After professional quenching and tempering, 1.3351 can maintain hardness above HRC 60 at 500-600℃ high temperature, with excellent red hardness, far better than ordinary low-alloy tool steel.
We adopt multiple advanced smelting processes to improve steel purity, reduce inclusions and enhance material fatigue resistance:
EF+LF+VD / EAF+LF+VD: Conventional high-purity smelting, cost-effective for mass production
EF+LF+VD+ESR / EAF+LF+VD+ESR: Electroslag remelting process, higher purity, finer grain, for high-end precision tools and high-load molds
Forging start temperature: 1150-1180℃
Forging finish temperature: ≥900℃
Cooling method: Furnace cooling or sand cooling (prevent rapid cooling cracking, ensure uniform internal structure)
All products pass Ultrasonic Testing in accordance with international standards: EN10228-3 Class III or Sep 1921-84 D/D, effectively detecting internal pores, cracks, inclusions and other defects, 100% qualified before delivery.
Heat the steel to 850-870℃
Slow cooling in the furnace
Purpose: Reduce hardness, eliminate internal stress, facilitate cutting and forming
Quenching: Heat to 1110-1130℃ via salt bath furnace, then oil quenching
Tempering: Furnace tempering at 550-570℃, air cooling after completion
Final hardness: Stably reach HRC 64 or above
Supplement: For ultra-high wear resistance requirements, multiple tempering (2-3 times) is recommended to completely eliminate quenching stress and avoid tool deformation during use.
Above curve in figure is a rough guide to the tempering behaviour of steels.
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. | |||||
1.3351 relies on excellent comprehensive performance and is widely used in high-end industrial fields, divided into 3 major categories:
Complex forming tools: Gear hobs, broaches, reamers, form milling cutters for precision machining
High-load drilling & milling tools: Drills, end mills, face mills for processing stainless steel, Inconel high-temperature alloys, titanium alloys and hardened steel
Thread processing tools: High-performance taps and thread milling cutters for difficult-to-cut material thread machining
Cold work dies: Precision blanking dies, cold extrusion punches and dies
High-temperature working dies: Substrate or insert for warm forging dies
Precision bearings, guide rails, nozzles and other key parts working under high wear and medium-high temperature conditions.
| Comparison Item | 1.3351 (SKH54) | M2 (1.3343/SKH51) | Advantage Analysis |
| Carbon Content | 1.25-1.40% (High Carbon) | 0.80-0.90% (Medium Carbon) | 1.3351 has higher hardness and wear resistance |
| Vanadium Content | 3.70-4.20% (Ultra-high V) | 1.80-2.20% | 1.3351 is more suitable for long-term processing of high-abrasion workpieces |
| Hardness after Heat Treatment | HRC 64-68 | HRC 62-65 | 1.3351 has stronger high-temperature hardness |
| Wear Resistance | Excellent | Good | 1.3351 tool life is 20%-40% longer than M2 |
| Toughness | Medium | Excellent | M2 is better for impact load scenarios |
| Typical Application | Difficult-to-cut materials, high-load continuous cutting | General metal cutting, tools with impact requirements | Choose 1.3351 for high wear resistance; choose M2 for high toughness |
W18Cr4V: Low vanadium, good grindability, medium red hardness, suitable for ordinary cutting tools; poor thermal plasticity, not suitable for high-load high-temperature working conditions.
1.3351 (HS6-5-4): Tungsten-molybdenum composite + high vanadium design, far superior red hardness and wear resistance, stable performance under extreme working conditions, belonging to upgraded high-performance high speed steel.
Choose 1.3351 / SKH54 / HS6-5-4: For processing stainless steel, high-temperature alloys, titanium alloys and hardened steel.
Choose M2 / SKH51: For general carbon steel, ordinary alloy steel cutting with impact requirements.
Choose W18Cr4V: For low-cost ordinary tools with simple processes.
A1: Yes. They are the same high speed steel with different national standard designations: HS6-5-4 (ISO), 1.3351 (German DIN), SKH54 (Japanese JIS). The chemical composition, mechanical properties and heat treatment process are completely consistent and can be used interchangeably.
A2: After standard quenching and tempering, the hardness is at least HRC 64. By optimizing the heat treatment process, the hardness can reach HRC 67-68, with excellent wear resistance.
A3: It is mainly used for difficult-to-cut materials: stainless steel, nickel-based high-temperature alloys (Inconel), titanium alloys, and hardened steel with hardness above HRC 50. It is not recommended for ultra-soft pure aluminum (easy to stick to the knife).
A4: Annealed state (HB ≤269): Soft material, convenient for customers to cut, turn and reprocess, and do independent heat treatment. Quenched & tempered state (HRC 64+): Finished tool hardness, can be directly used for cutting after simple grinding.
For custom sizes, alternative equivalents, or technical datasheets, please contact us with your drawing or specification.
