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Grade: DIN 1.5919/15CrNi6
Equivalent Steel: AISI 3115, AFNOR 16NC6
DIN 1.5919 steel, also known as 15CrNi6, is a low-alloy case-hardening steel with a well-balanced chemical makeup. It contains 0.14%–0.19% carbon for hardenability, 1.40%–1.70% chromium for surface wear resistance, and 1.40%–1.70% nickel for enhanced core toughness and low-temperature impact strength. Manganese (0.40%–0.60%) acts as a deoxidizer, while silicon is kept below 0.40% to ensure good formability. Impurities like phosphorus and sulfur are strictly limited to 0.035% max, guaranteeing high material purity.
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1.5919
Qilu
1.5919 steel (also known as DIN 15CrNi6 or AISI 3115) is a high-quality alloyed case-hardening steel that combines excellent core toughness with a wear-resistant surface after carburizing. This low-alloy chromium-nickel steel is engineered for components that demand high strength, good ductility, and reliable performance under cyclic and impact loading conditions.
With its optimized nickel-chromium composition, 1.5919 exhibits superior hardenability, excellent fatigue resistance, and remarkable low-temperature impact toughness compared to conventional carbon steels. The material is widely specified in automotive, mechanical engineering, and precision tooling applications where dimensional stability and surface durability are critical.
Country | USA | German |
Standard | ASTM A29 | DIN 17210 |
Grade | 3115 | 1.5919/15CrNi6 |
Grade | C | Si | Mn | P | S | Cr | Ni |
15CrNi6/1.5919 | 0.14-0.19 | 0.40Max | 0.40-0.60 | 0.035Max | 0.035Max | 1.40-1.70 | 1.40-1.70 |
| Property | Value |
| Tensile Strength Rm | ≤700 MPa |
| Brinell Hardness (HB) | ≤217 HB |
| Elongation A | ≥11% |
| Reduction of Area Z | ≥50% |
After carburizing + quenching + low temperature tempering:
Surface hardness: 58–62 HRC; Core tensile strength: 900–1200 MPa
| Process | Temperature Range | Details & Media |
| Hot Forming / Forging | 1100–850°C | Cool after forging |
| Normalizing | 850–880°C | Improves grain structure uniformity |
| Soft Annealing | 650–700°C | Slow cool; produces ≤ 217 HB for cold working |
| Carburizing | 850–980°C | Creates high-carbon surface layer. Quench in oil, water, or salt bath |
| Core Hardening | 830–870°C | Ensures core toughness. Quench in oil or water |
| Surface Hardening | 780–820°C | Refines the carburized layer. Quench in oil |
| Tempering | 150–200°C | Relieves quenching stresses; balances hardness and toughness |
| Distance in mm from quenched end | |||||||||||||
| Distance | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 15 |
| max | 47 | 47 | 46 | 45 | 43 | 42 | 41 | 39 | 37 | 35 | 34 | 34 | 33 |
| min | 39 | 38 | 36 | 35 | 32 | 30 | 28 | 26 | 24 | 22 | 21 | 20 | 20 |
Product type | Size range | Length |
Cold drawn bar | Φ3-Φ80mm | 6000-9000mm |
Hot rolled bar | Φ16-Φ310mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:3-200mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 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. | |||||
Stock levels update daily—contact us for real-time availability and custom sizing.
Thanks to its high structural integrity and surface durability, 1.5919 is the material of choice for critical components across multiple industries:
Engine connecting rods and cylinder head bolts
Transmission gears, shaft pins, and clutch pins
Crown gears and bevel gears
High-strength fasteners
Hydraulic cylinder bolts and construction machinery pins
Cutting tools, stamping tools, and cold working rolls
Aerospace fasteners (landing gear components)
Pressure vessels and seamless tubes
Woodworking and deep-drawing tools
Both are classic DIN Cr-Ni case hardening steels. 1.5919 has lower carbon and nickel content, delivering better core toughness for medium-sized components. 1.5920 features higher alloy content and far stronger hardenability, designed for workpieces over 100 mm diameter.
Selection Tip: Choose 1.5919 if your part dimension ranges from 30–120 mm with strict anti-impact requirements; pick 1.5920 for extra-large cross-section forgings.
16MnCr5 steel is Mn-Cr low-alloy steel with cost advantages, yet it cannot maintain stable core toughness once component size exceeds 40 mm.
1.5919 steel adds nickel to the alloy formula. Nickel greatly enhances low-temperature impact performance and fatigue resistance under heavy shock. For large gears suffering frequent impact load, 16MnCr5 is prone to tooth root fracture, while 1.5919 effectively avoids such failure.
Selection Tip: Use 16MnCr5 for small, lightly loaded parts; upgrade to 1.5919 for medium-large heavy impact transmission components.
20CrNiMo contains molybdenum to minimise quenching deformation, widely used in precision automotive gear assemblies. However, its overall impact toughness is inferior to 1.5919 under extreme dynamic overload.
If your equipment faces sudden shock, construction machinery or agricultural heavy-load transmission, 1.5919 performs more reliably. For high-precision, moderate-load auto gearboxes, 20CrNiMo remains a cost-effective alternative.
SAE 3115 is generally regarded as the approximate equivalent of DIN 1.5919 (15CrNi6). Still, raw material melting standards, impurity control and heat treatment response have minor differences between European and American production routes.
A1: Both are Cr-Ni carburizing steel. 1.5919 (15CrNi6) has lower carbon content, better core toughness, suitable for larger dimension parts.
A2: They refer to the exact same material. 1.5919 is the numeric material designation under German/DIN standards, while 15CrNi6 is the chemical symbol-based name. Both are interchangeable and equally valid for ordering and specification purposes.
A3: The direct AISI/SAE equivalent is AISI 3115. This makes 1.5919 fully compatible with international supply chains and allows for seamless substitution in global engineering projects.
A4: After carburizing, quenching, and tempering, tensile strength typically ranges from 880 to 1270 MPa (depending on section size), with yield strength ≥ 635 MPa and impact energy up to 41 J. The surface hardness can reach 58–62 HRC while the core maintains excellent ductility.
A5: Yes. 1.5919 exhibits excellent cold formability with low work-hardening sensitivity. It supports cold deformation rates of 60%–85% without cracking, making it ideal for high-volume production of fasteners and shaped components.
