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S7
Qilu
DIN 50CrMoV13-15 (material number 1.2355) is a medium‑carbon, chromium‑molybdenum‑vanadium alloy tool steel standardized in DIN EN ISO 4957, widely recognized as the equivalent grade to AISI S7 under ASTM A681. It delivers an outstanding balance of strength, toughness, fatigue resistance, hardenability, and moderate wear, making it ideal for high‑dynamic‑load components, hot work dies, and heavy‑duty tooling that demands both hardness and impact resistance.
Excellent strength‑toughness balance – resists chipping and cracking under heavy impact loads.
High fatigue strength – reliable for repeated high‑stress cycles.
Great hardenability – deep hardening with consistent properties across large sections.
Good tempering resistance – maintains hardness and stability at elevated temperatures.
Low deformation in heat treatment – high dimensional stability for precision parts.
Versatile performance – usable in both hot work and cold work tooling applications.
Country | ISO | Germany | USA |
Standard | ISO 4957 | DIN 17350 | ASTM A681 |
Grade | 50CrMoV13-15 | 50CrMoV13-15/1.2355 | S7 |
Grade | C | Si | Mn | Cr | Mo | P | S | V |
50CrMoV13-15/ 1.2355 | 0.45-0.55 | 0.20-0.80 | 0.50-0.90 | 3.00-3.50 | 1.30-1.70 | 0.030Max | 0.020Max | 0.15-0.35 |
| S7 | 0.45-0.55 | 0.20-1.00 | 0.20-0.90 | 3.00-3.50 | 1.30-1.80 | 0.030Max | 0.030Max | 0.35 Max |
Heat Treatment | Hardness |
| Annealed (+A) | HB248Max |
| Cold-drawn condition | HB255Max |
| Hardening and Tempering (+HT) | HRC56 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
Annealing
Heat to 600–650°C, cool slowly in furnace or air.
Quenching
Austenitize at 1000–1020°C (salt bath), oil quench.
Tempering
Temper at 500–520°C, cool in air to stabilize hardness and toughness.
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
Forging: Start 1050–1150°C, finish ≥ 850°C; cool in furnace or sand
Ultrasonic test: EN 10228‑3 Class III or SEP 1921‑84 D/D
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. | |||||
Forging dies (hammer & press forging dies for ferrous metals)
Die casting dies (aluminum die casting: cores, slides, mold bases)
Extrusion dies (support parts, die sleeves for non‑ferrous metals)
Plastic injection molds (high‑strength mold bases, cavity plates)
Heavy‑duty shear blades, large circular saw bodies, paper cutters
Roll forming tools for sheet metal processing
High‑strength woodworking cutting tools
Crankshafts, connecting rods for large engines, presses, compressors
Heavy‑duty gear shafts, camshafts, machine tool spindles
High‑load gears, guide rails, slides, bearing sleeves
High‑strength vice jaws and bodies
Precision gauges, calipers requiring dimensional stability
| Grade | Core Strength | Toughness | Wear Resistance | Typical Use |
| 1.2355 / S7 | Very high | Excellent | Moderate | Impact dies, hot forging, high‑load shafts |
| 1.2344 / H13 | High | Good | Good | High‑temp die casting, extrusion |
| 1.2080 / D2 | High | Low | Very high | Cold work, blanking, stamping |
| 1.2379 / K110 | Ultra‑high | Low | Extreme | High‑wear cold work tools |
A1: Yes. 1.2355 (DIN 50CrMoV13-15) is the direct German equivalent of AISI S7 under ASTM A681. They have nearly identical chemical composition and performance, and are interchangeable in most applications.
A2: It is classified as hot work tool steel but performs well in cold work applications requiring high impact toughness. It works for forging, die casting, and heavy‑duty cold tools alike.
A3: After proper quenching and tempering, 1.2355 can reach ≥ HRC 56. Common working hardness ranges HRC 45–55 for balanced toughness and life.
A4: Choose 1.2355 / S7 when you need superior toughness and impact resistance – better than H13 under heavy shock and far tougher than D2. Use H13 for high‑temperature die casting; use D2 for maximum wear resistance in low‑impact cold work.
A5: No. It has excellent hardenability and dimensional stability, low distortion after quenching and tempering – suitable for precision molds and long components.
A6: Automotive, mold & die, metal forming, machinery, hardware tools, and heavy equipment – any sector needing high‑strength, shock‑resistant tooling and components.
Need a quote for 1.2355 / AISI S7 or want to confirm size, hardness, or delivery? Contact us now for fast feedback and competitive pricing.
