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E: enquiry@qilumetal.com
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50CrMoV13-15 / 1.2355 is a widely used medium-carbon quenched and tempered alloy tool steel conforming to the German standard DIN EN ISO 4957. It is renowned for its favorable balance of strength and toughness, high fatigue strength, excellent hardenability, and moderate wear resistance. Following appropriate heat treatment, this steel exhibits favorable overall mechanical properties and dimensional stability. It is suitable for components subjected to high dynamic loads and fatigue stresses, such as heavy-duty shafts, connecting rods, and high-load mold components. Due to its balanced performance characteristics, equivalent steel grades exist in multiple national standards, such as ASTM S7 from American standard ASTM A681.
1.2355 steel contains moderate carbon content with higher proportions of chromium and molybdenum, supplemented by vanadium. These elements collectively ensure the steel's hardenability, form stable carbides to enhance wear resistance, and refine grain structure through vanadium addition, thereby improving toughness and strength. The synergy of chromium and molybdenum significantly enhances the steel's resistance to tempering softening, enabling it to maintain performance at elevated temperatures. Its excellent toughness makes it highly suitable for critical applications demanding both high strength and high impact toughness.
1: Steel equivalent
Country | ISO | Germany | USA |
Standard | ISO 4957 | DIN 17350 | ASTM A681 |
Grade | 50CrMoV13-15 | 50CrMoV13-15/1.2355 | S7 |
2: Chemical composition
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 |
3: Surface hardness and hardenability
Heat Treatment | Hardness |
| Annealed (+A) | HB248Max |
| Cold-drawn condition | HB255Max |
| Hardening and Tempering (+HT) | HRC56 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
4: Supply size & Tolerance & Stock size
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. | |||||
For 1.2355 steel, because we don’t use them in domestic market, so there is no stocks for that material.
5: Ultrasonic Test
EN10228-3 class III or Sep 1921-84 D/D
6：Steel making & Forging processing
1): Steel making process:
EF+LF+VD
EAF+LF+VD
EF+LF+VD+ESR
EAF+LF+VD+ESR
2): Forging processing:
Initial temperature: 1050-1150℃
Final temperature: 850℃
Cooling in the furnace or in the sand
7: Heat treatment
1): Annealed:
Heat 1.2355 steel to 600-650℃
Cooling in the furnace or in the air
2): Quenching and tempering:
Heat 1.2355 steel to 1000-1020℃ in the salt bath furnace
Quench in the Oil
Temper steel at 500-520℃ in the furnace
Cooling in the air.
Above curve in figure is a rough guide to the tempering behaviour of steels.
8：Application
1.2355 steel finds extensive industrial applications due to its excellent combination of strength and toughness, high fatigue strength, and good hardenability. Below are the primary application areas and specific uses of 1.2355 steel:
1. Mold Manufacturing
Forging Dies: Used to manufacture hammer forging dies and press forging dies, particularly for forming ferrous metals (such as steel and iron)
Die casting dies: Primarily used for die casting components in aluminum alloy die casting, such as cores, slides, and die bases
Extrusion dies: Used for support components and die sleeves in extrusion dies for non-ferrous metals (e.g., aluminum, copper alloys)
Plastic molds: Used for manufacturing mold bases, cavity plates, etc., for large or long-life plastic injection molds requiring high strength and wear resistance
2. Cutting Tools and Machining Tools
Heavy-duty cutting tools: Such as shear blades, large circular saw blade bodies, paper cutting blades, etc.
Roll shears: Used in roll forming lines for metal sheet processing
Woodworking tools: Cutting tools for woodworking applications requiring high strength
3. Mechanical Components and Shafts
Crankshafts and Connecting Rods: Particularly for large engines, compressors, or presses
Heavy-Duty Shafts: Such as gear shafts, camshafts, machine tool spindles
High-Load Gears: For heavy-duty transmission systems
Wear-Resistant Parts: Components requiring high wear resistance and impact toughness, e.g., guide rails, slides, bearing sleeves
4. Other Tools
Vices: Used to manufacture high-strength jaws and bodies for flat-jaw vices and bench vices
Gauges and calipers: Precision measuring tools requiring high dimensional stability and wear resistance
50CrMoV13-15 / 1.2355 is a widely used medium-carbon quenched and tempered alloy tool steel conforming to the German standard DIN EN ISO 4957. It is renowned for its favorable balance of strength and toughness, high fatigue strength, excellent hardenability, and moderate wear resistance. Following appropriate heat treatment, this steel exhibits favorable overall mechanical properties and dimensional stability. It is suitable for components subjected to high dynamic loads and fatigue stresses, such as heavy-duty shafts, connecting rods, and high-load mold components. Due to its balanced performance characteristics, equivalent steel grades exist in multiple national standards, such as ASTM S7 from American standard ASTM A681.
1.2355 steel contains moderate carbon content with higher proportions of chromium and molybdenum, supplemented by vanadium. These elements collectively ensure the steel's hardenability, form stable carbides to enhance wear resistance, and refine grain structure through vanadium addition, thereby improving toughness and strength. The synergy of chromium and molybdenum significantly enhances the steel's resistance to tempering softening, enabling it to maintain performance at elevated temperatures. Its excellent toughness makes it highly suitable for critical applications demanding both high strength and high impact toughness.
1: Steel equivalent
Country | ISO | Germany | USA |
Standard | ISO 4957 | DIN 17350 | ASTM A681 |
Grade | 50CrMoV13-15 | 50CrMoV13-15/1.2355 | S7 |
2: Chemical composition
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 |
3: Surface hardness and hardenability
Heat Treatment | Hardness |
| Annealed (+A) | HB248Max |
| Cold-drawn condition | HB255Max |
| Hardening and Tempering (+HT) | HRC56 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
4: Supply size & Tolerance & Stock size
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. | |||||
For 1.2355 steel, because we don’t use them in domestic market, so there is no stocks for that material.
5: Ultrasonic Test
EN10228-3 class III or Sep 1921-84 D/D
6：Steel making & Forging processing
1): Steel making process:
EF+LF+VD
EAF+LF+VD
EF+LF+VD+ESR
EAF+LF+VD+ESR
2): Forging processing:
Initial temperature: 1050-1150℃
Final temperature: 850℃
Cooling in the furnace or in the sand
7: Heat treatment
1): Annealed:
Heat 1.2355 steel to 600-650℃
Cooling in the furnace or in the air
2): Quenching and tempering:
Heat 1.2355 steel to 1000-1020℃ in the salt bath furnace
Quench in the Oil
Temper steel at 500-520℃ in the furnace
Cooling in the air.
Above curve in figure is a rough guide to the tempering behaviour of steels.
8：Application
1.2355 steel finds extensive industrial applications due to its excellent combination of strength and toughness, high fatigue strength, and good hardenability. Below are the primary application areas and specific uses of 1.2355 steel:
1. Mold Manufacturing
Forging Dies: Used to manufacture hammer forging dies and press forging dies, particularly for forming ferrous metals (such as steel and iron)
Die casting dies: Primarily used for die casting components in aluminum alloy die casting, such as cores, slides, and die bases
Extrusion dies: Used for support components and die sleeves in extrusion dies for non-ferrous metals (e.g., aluminum, copper alloys)
Plastic molds: Used for manufacturing mold bases, cavity plates, etc., for large or long-life plastic injection molds requiring high strength and wear resistance
2. Cutting Tools and Machining Tools
Heavy-duty cutting tools: Such as shear blades, large circular saw blade bodies, paper cutting blades, etc.
Roll shears: Used in roll forming lines for metal sheet processing
Woodworking tools: Cutting tools for woodworking applications requiring high strength
3. Mechanical Components and Shafts
Crankshafts and Connecting Rods: Particularly for large engines, compressors, or presses
Heavy-Duty Shafts: Such as gear shafts, camshafts, machine tool spindles
High-Load Gears: For heavy-duty transmission systems
Wear-Resistant Parts: Components requiring high wear resistance and impact toughness, e.g., guide rails, slides, bearing sleeves
4. Other Tools
Vices: Used to manufacture high-strength jaws and bodies for flat-jaw vices and bench vices
Gauges and calipers: Precision measuring tools requiring high dimensional stability and wear resistance
