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Alloy Tool Steel
BRAND: PROMISTEEL
GRADES: 9SiCr, Cr2, 9Cr2, ASTM S1/S5/S7, JIS SKS Series
SHAPES & SIZES: Round Bar (φ10-500mm), Flat Bar, Plate, Sheet
DELIVERY CONDITION: EAF+LF+VD, Annealed, Spheroidizing Annealed ALLOY
ELEMENTS: Cr, Mn, Si, W, V
HARDNESS: Annealed ≤255 HB; Quenched ≥58-62 HRC
APPLICATION: Threading Tools, Gauges, Impact Tools (Chisels), Drill Rods
MOQ: 25 Tons
Alloy Tool Steel is a specialized category of high-performance steel enhanced with alloying elements such as chromium (Cr), molybdenum (Mo), tungsten (W), and vanadium (V). While retaining the cost-effectiveness of tool steel, these elements significantly improve the material's hardenability, toughness, and wear resistance compared to plain carbon tool steels.
This steel class is engineered for manufacturing tools that require deep hardening, high dimensional stability, or resistance to impact loads. It is widely used for producing complex measuring tools (like micrometers and gauges), cutting tools (taps and dies), and impact-resistant tools (like chisels and pneumatic tools).
Product Specifications & Grade Equivalents
We supply a diverse range of Alloy Tool Steel grades, including Measuring/Cutting Steels and Shock-Resisting Steels.
Table-1
Find the exact equivalent for your engineering requirements.
International Grade Comparison |
|||
| GB (China) | ASTM (USA) | JIS (Japan) | Type/Application |
| 9SiCr | - | SKS Series |
Measuring & Cutting Tools |
| Cr2 / 9Cr2 | - | - |
Gauge & Cold Roll Steel |
| 5CrW2Si | S1 | - |
Shock-Resisting Tool Steel |
| 6CrMnSi2Mo1 | S5 | - |
Shock-Resisting Tool Steel |
| 5Cr3Mn1SiMo1V | S7 | - |
High-Impact Tool Steel |
| W | F1 | SK120 |
Water Hardening Alloy |
Table-2
Precise alloying ensures uniform carbide distribution and hardenability.
Chemical Composition (Mass Fraction %) |
|||||||
| Grade | C | Si | Mn | Cr | W | Mo | V |
| 9SiCr | 0.85~0.95 | 1.20~1.60 | 0.30~0.60 | 0.95~1.25 | - | - | - |
| Cr2 | 0.95~1.10 | ≤0.40 | ≤0.40 | 1.30~1.65 | - | - | - |
| 4CrW2Si | 0.35~0.45 | 0.80~1.10 | ≤0.40 | 1.00~1.30 | 2.00~2.50 | - | - |
| 5CrW2Si (S1) | 0.45~0.55 | 0.50~0.80 | ≤0.40 | 1.00~1.30 | 2.00~2.50 | - | - |
| S7 Equiv. | 0.45~0.55 | 0.20~1.00 | 0.20~0.90 | 3.00~3.50 | - | 1.30~1.80 | ≤0.35 |
Table-3
Supply Range & Formats |
||
| Types | Diameter/Thickness (mm) | Length/Width (mm) |
| Round Bars | 10 mm – 500 mm | Customized |
| Flat Bars | 5 mm - 200 mm | 20 mm - 1000 mm |
| Plates | 10 mm - 400 mm | Customized |
| Sheets | 1 mm - 6 mm | Customized |
Questions? We're Here to Help!
Key Features and Advantages
Enhanced Hardenability
The addition of Chromium and Manganese allows for deeper and more uniform hardening during heat treatment compared to carbon steel.
01
High Toughness & Impact Resistance
Grades like S1, S5, and S7 are specifically alloyed with Vanadium and Molybdenum to resist cracking and breaking under heavy stress and shock.
02
Superior Dimensional Stability
Ideal for measuring instruments (like 9SiCr), minimizing deformation during quenching to ensure long-term accuracy.
03
Wear Resistance
Tungsten and Chromium carbides provide a hard surface that resists abrasion, extending the lifespan of cutting edges.
04
Versatility
Suitable for both oil quenching and air hardening depending on the grade, offering flexibility in manufacturing processes.
05
Typical Applications
Alloy Tool Steel is the material of choice when Carbon Tool Steel performance is insufficient but High-Speed Steel is unnecessary:
1
Precision tools such as calipers, micrometers, and plug gauges rely on grades like 9SiCr and Cr2 for their ability to hold tight tolerances.
2
Used for manufacturing taps, dies, reamers, and milling cutters where moderate cutting speeds and high toughness are required.
3
Grades like 5CrW2Si (S1) are standard for pneumatic chisels, shear blades, and punches that must withstand repeated heavy impacts without chipping.
4
Certain alloy tool steels bridge the gap to mold steels, used for plastic injection molding and die-casting components.
FAQ
Q1: What is 9SiCr steel used for?
A1: 9SiCr is a classic alloy tool steel widely used for manufacturing cutting tools (like taps and dies) and precision measuring tools due to its high hardenability and tempering stability.
Q2: How does Alloy Tool Steel differ from Carbon Tool Steel?
A2: Alloy Tool Steel contains added elements like Cr, W, and V. This gives it better hardenability (it can harden deeper), better wear resistance, and significantly higher toughness compared to Carbon Tool Steel (T-series).
Q3: What is "Shock Resisting" Tool Steel?
A3: These are alloy tool steels (like ASTM S1, S5, and S7) designed with lower carbon and higher toughness-enhancing alloys (Si, Mo) to withstand heavy shocks and impacts, making them ideal for hammers, chisels, and punches.
Q4: Can these steels be used for Molds?
A4: Yes, many alloy tool steels are used for mold bases or specific mold components, though for high-volume production, dedicated Cold Work (D2) or Hot Work (H13) Mold Steels are recommended.
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