3315 & 3415 | 14NiCr14 / 14NiCr18 Case-Hardening Steels | 1.5752 & 1.5860
PRODUCT DESCRIPTION
3315 / 14NiCr14 / 1.5752 and 3415 / 14NiCr18 / 1.5860 are special high-nickel chromium case-hardening steels intended to provide a hard, wear-resistant surface and a tough supporting core. They are related grades, but not automatically interchangeable.MATERIAL INFORMATION
3315 & 3415 | 14NiCr14 / 14NiCr18 Case-Hardening Steels
3315 and 3415 are special case-hardening steels with high nickel and chromium content. They are used where carburizing, hardening and tempering are intended to create a hard, wear-resistant surface combined with a tougher core capable of supporting mechanical loading and impact.
Saf Çelik evaluates these grades under the market names 3315 and 3415. Technically, the 3315 group is associated with material number 1.5752 and the designations 15NiCr13 / 14NiCr14; the 3415 group is associated with material number 1.5860 and the designation 14NiCr18.
Important: Although 3315 and 3415 belong to the same case-hardening steel family, their chemical composition, hardenability and core mechanical properties are different. One grade must not be accepted as an automatic substitute for the other. The requested grade, material number, chemical analysis, delivery condition and certification requirements must be defined for every order.
Grade Identification
| Item | 3315 | 3415 |
|---|---|---|
| Commercial designation | 3315 | 3415 |
| Material number | 1.5752 | 1.5860 |
| Technical designations | 15NiCr13 / 14NiCr14 | 14NiCr18 |
| Material family | High-nickel chromium case-hardening steel | High-nickel chromium case-hardening steel |
| General application approach | Gears, cams, shafts and transmission components | Gears and drive components requiring higher core-strength potential |
Chemical Composition
| Element | 3315 / 14NiCr14 / 1.5752 (%) | 3415 / 14NiCr18 / 1.5860 (%) |
|---|---|---|
| Carbon (C) | 0.14 – 0.20 | 0.10 – 0.17 |
| Silicon (Si) | max. 0.40 | 0.15 – 0.35 |
| Manganese (Mn) | 0.40 – 0.70 | 0.40 – 0.70 |
| Phosphorus (P) | max. 0.035 | max. 0.035 |
| Sulphur (S) | max. 0.035 | max. 0.035 |
| Chromium (Cr) | 0.60 – 0.90 | 0.90 – 1.30 |
| Nickel (Ni) | 3.00 – 3.50 | 4.25 – 4.75 |
The higher nickel and chromium content of 3415 / 14NiCr18 / 1.5860 is relevant where greater hardenability and higher core-strength potential are required. Final grade selection must consider section size, required case depth, operating load, impact requirement and the planned heat-treatment route.
Case Hardening and Heat Treatment
3315 and 3415 have a low-carbon core composition suitable for carburizing. Carbon is introduced into the surface layer during case hardening; subsequent hardening and tempering are then used to obtain a hard surface with a tougher supporting core.
Technical heat-treatment references for 3415 / 14NiCr18 / 1.5860:
| Operation | Reference temperature |
|---|---|
| Hot working | 850 – 1150 °C |
| Soft annealing (+A) | 610 – 650 °C |
| Hardness-range treatment (+TH) | 830 – 860 °C |
| Ferritic-pearlitic treatment (+FP) | 900 – 950 °C |
| Carburizing | 850 – 900 °C |
| Core hardening | 830 – 860 °C |
| Surface hardening | 780 – 800 °C |
| Tempering | 170 – 200 °C, minimum 1 hour |
| Intermediate annealing | 600 – 630 °C |
These figures are technical starting references only. The final heat-treatment cycle must be validated by a qualified heat-treatment provider according to component dimensions, section thickness, target case depth, furnace practice, quenching medium, distortion risk and required hardness.
Reference Core Properties After Case Hardening
The following values are reference data for the core after case hardening. They must not be treated as certified values for a particular stock item; the actual delivery condition and available certification must be reviewed for each lot.
| Grade and section | Yield strength | Tensile strength | Elongation A5 | Reduction of area | Impact energy |
|---|---|---|---|---|---|
| 3315 / 1.5752, ≤ 11 mm | ≥ 835 MPa | 1030 – 1320 MPa | ≥ 9% | ≥ 40% | ≥ 55 J |
| 3315 / 1.5752, ≤ 30 mm | ≥ 785 MPa | 930 – 1230 MPa | ≥ 10% | ≥ 45% | ≥ 55 J |
| 3315 / 1.5752, ≤ 63 mm | ≥ 735 MPa | 880 – 1180 MPa | ≥ 10% | ≥ 45% | — |
| 3415 / 1.5860, ≤ 11 mm | ≥ 930 MPa | 1270 – 1420 MPa | ≥ 7% | ≥ 35% | ≥ 41 J |
| 3415 / 1.5860, ≤ 30 mm | ≥ 865 MPa | 1180 – 1370 MPa | ≥ 7% | ≥ 40% | ≥ 41 J |
| 3415 / 1.5860, ≤ 63 mm | ≥ 785 MPa | 1000 – 1320 MPa | ≥ 8% | ≥ 40% | — |
Machining and Weldability
3315 and 3415 can be machined in soft-annealed or suitably pre-treated condition. For carburized components, the sequence of rough machining, carburizing, hardening and final grinding is important for dimensional control and distortion management.
Due to their high nickel-chromium content, welding requires careful planning. Where welding is necessary, the welding procedure, preheating, controlled cooling and any post-weld heat treatment must be determined according to the actual material condition and service requirements.
Typical Applications
- Highly loaded gears and pinions
- Drive shafts, transmission components and cardan parts
- Camshafts and cam mechanisms
- Bushes, pins and connection components
- Wear-loaded machine parts
- Special components requiring a hard surface and a tough core
Availability and Certification Note
Availability, section size, length, delivery condition and available documentation for 3315 / 14NiCr14 / 1.5752 and 3415 / 14NiCr18 / 1.5860 are confirmed during quotation. Chemical analysis or ultrasonic examination results do not automatically replace requested original mill traceability or an EN 10204 3.1 material certificate.
For safety-critical, lifting, pressure, aerospace or similarly high-responsibility applications, material selection must not be made until the relevant product standard, certification, heat-treatment records and customer specification have been confirmed.