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T: +86-0731-85185770
E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
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35NiCr6
Qilu
Grade | C | Si | Mn | P | S | Cr | Ni |
| 35NiCr6/1.5815 | 0.30-0.37 | 0.40Max | 0.60-0.90 | 0.025Max | 0.025Max | 0.80-1.10 | 1.20-1.60 |
Mechanical indicators vary slightly according to material cross-section size. All test samples are taken 12.5 mm below the heat-treated surface as required by EN 10083-1.
Size range | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 880-1080Mpa | 740Mpa Min | 12% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 880-1080Mpa | 740Mpa Min | 14% Min | 40%Min | 35J Min |
40＜d≤100 20＜t≤60 | 780-980Mpa | 640Mpa Min | 15% Min | 40%Min | 35J Min |
Heat Treatment | Hardness |
| Soft annealed (+A) | HB223Max |
Quenched and tempred (+QT) | HRC28-32(Common Range) |
Three hardenability grades (+H / +HH / +HL) are available for customized orders, applicable to parts with different hardening depth requirements:
+H (Normal Hardenability): Hardness range 35 ~ 58 HRC at 1.5–35 mm from quenched end;
+HH (High Hardenability): Higher minimum hardness (45 ~ 58 HRC), for thick-walled parts requiring full hardening;
+HL (Low Hardenability): Lower maximum hardness (40 ~ 54 HRC), for parts needing partial softening and easy machining.
Distance in mm from quenched end | ||||||||||||||||
Distance | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | |
Hardness In HRC + H | max | 58 | 58 | 58 | 57 | 57 | 55 | 55 | 55 | 53 | 53 | 50 | 50 | / | / | / |
min | 49 | 49 | 49 | 48 | 48 | 44 | 44 | 44 | 40 | 40 | 35 | 35 | / | / | / | |
Hardness In HRC + HH | max | 58 | 58 | 58 | 57 | 57 | 55 | 55 | 55 | 53 | 53 | 50 | 50 | / | / | / |
min | 53 | 53 | 53 | 52 | 52 | 50 | 50 | 50 | 48 | 48 | 45 | 45 | / | / | / | |
Hardness In HRC + HL | max | 54 | 54 | 54 | 53 | 53 | 49 | 49 | 49 | 45 | 45 | 40 | 40 | / | / | / |
min | 49 | 49 | 49 | 48 | 48 | 44 | 44 | 44 | 40 | 40 | 35 | 35 | / | / | / | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
Heating temperature: 1150 ~ 1200 ℃ (uniform heating to avoid local overheating);
Cooling method: Air cooling after forging.
Heat to 550 ~ 650 ℃, hold for sufficient time, then furnace cooling or air cooling.
Purpose: Reduce hardness (≤HB 223), improve cutting performance, relieve internal stress.
Heat to 860 ~ 880 ℃, hold, then air cooling.
Purpose: Refine grain, homogenize structure, prepare for subsequent quenching and tempering.
Quenching: Heat to 840 ~ 860 ℃, hold, water quenching (low temperature section) or oil quenching (high temperature section);
Tempering: Reheat to 530 ~ 630 ℃, hold, then air cooling;
Final state: Comprehensive strength + toughness matched, hardness HRC 28~32.
Product type | Size range | Length |
Hot rolled bar | Φ16-Φ300mm | 6000-9000mm |
Hot forged bar | Φ140-Φ800mm | 3000-5800mm |
Hot rolled plate/sheet | T:12-120mm; 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. | |||||
35NiCr6 / 1.5815 has poor weldability due to medium carbon content and high Ni-Cr alloy content. It is prone to cold cracks and hardened structures in weld seam and heat-affected zone (HAZ).
Relying on high strength, high toughness, fatigue resistance and wear resistance, 35NiCr6 / 1.5815 is widely used in core load-bearing components across multiple industries:
Heavy-duty transmission gears, engine crankshafts, machine tool spindles, heavy-load connecting rods, high-strength bolts, reducer core parts.
Automotive transmission gears, drive shafts, universal joint forks, engine crankshafts, connecting rods, high-stress fastening bolts for commercial vehicles and heavy trucks.
Excavator slewing ring gears, travel mechanism shafts, crane load-bearing parts, crusher gears and drive shafts for mining equipment.
Wind turbine gearbox gears and main shafts (long-term stable operation under variable loads).
High-toughness plastic mold bases, high-load structural parts for petrochemical and marine equipment.
Customers often compare 35NiCr6 with mainstream domestic alloy steels 40Cr and 42CrMo for material selection. The detailed performance and application differences are as follows:
| Comparison Item | 35NiCr6 | 40Cr | 42CrMo |
| Main Alloy Elements | Ni + Cr (High nickel) | Single Cr | Cr + Mo |
| Low-Temperature Toughness | Excellent (-20℃ impact resistance far higher than peers) | General | Good |
| Hardenability | Excellent, suitable for large cross-section parts | Medium (limited critical quenching diameter) | Very good |
| Fatigue Resistance | Outstanding (long life under alternating load) | Medium | Good |
| Weldability | Poor | Medium | Poor |
| Typical Hardness (QT) | HRC 28~32 | HRC 25~35 | HRC 30~40 |
| Core Advantages | Low-temperature resistance, high toughness, stable fatigue performance | Cost-effective, easy processing | High strength, high temperature stability, anti-creep |
| Preferred Application | Cold-region equipment, heavy-duty crankshafts, connecting rods, impact gears | Ordinary medium-load shafts, bolts, gears | High-temperature parts, large-section transmission components |
Selection Suggestion:
Choose 35NiCr6 if your parts work in low-temperature environments, bear strong impact and long-term alternating loads, or require ultra-high toughness;
Choose 40Cr for conventional medium-load parts with cost priority;
Choose 42CrMo for parts requiring high-temperature resistance and high static strength.
A1: The conventional QT hardness is HRC 28~32; soft annealed state ≤ HB 223. We can customize hardenability (+H/+HH/+HL) according to requirements.
A2: Not recommended for direct welding. This steel has high cold crack sensitivity. If welding is necessary, preheat to 200~300 ℃ before welding and perform post-weld tempering for stress relief, and use special nickel-based welding materials.
A3: 35NiCr6 takes nickel as the main alloy element, with better low-temperature toughness and fatigue resistance, suitable for impact and cold working conditions; 42CrMo adds molybdenum, with better high-temperature strength and anti-creep performance, suitable for high-temperature working scenarios.
A4: We have hot-rolled bars from Φ16 mm to Φ230 mm in stock, and can provide forged bars up to Φ800 mm, steel plates and forged blocks. Support cutting, finishing and customized processing.
Inquire Now: Get the latest quotation, stock status and technical parameters.
