18CrNiMo7-6 Steel
18CrNiMo7-6 steel is a high-strength alloy structural steel with excellent hardness, strength, wear resistance, and toughness. Our 18CrNiMo7-6 steel forgings are widely used in the manufacture of high-load, high-speed components, such as gearbox gears.
- Customer drawings
- Heat treatment
- Inspection reports
Custom Materials · Heat Treatment · Machining
18CrNiMo7-6 Steel Forgings Applications
18CrNiMo7-6 steel forgings exhibit excellent mechanical properties, including high hardness, high strength, excellent wear resistance, and high toughness. 18CrNiMo7-6 steel forgings are ideal blank materials for high-load parts requiring both surface wear resistance and core toughness.
Automotive Industry:
Gearbox gears and drive shafts.
Energy and Chemical Industry:
Pump shafts and valve stems.
Aerospace:
Aircraft gears and engine parts.
Construction Machinery:
Reducer gears and pins.
Plastic molds:
Due to their high strength at medium temperatures, they have been used to manufacture missile engine housings, aircraft landing gear, rotor blades, etc. The working temperature range is typically 400-500℃.
18CrNiMo7-6 Forged Steel Features
18CrNiMo7-6 steel forgings exhibit excellent mechanical properties, including high hardness, high strength, excellent wear resistance, and high toughness.
Excellent mechanical properties:
Tensile strength ≥ 1100–1300 MPa, yield strength ≥ 900 MPa, elongation ≥ 10%, impact toughness ≥ 50 J (stable at -40℃)
High Hardness:
After carburizing and quenching, this steel achieves a surface hardness of 58–62 HRC, a wear-resistant layer depth of 0.8–1.6 mm, while maintaining a core hardness of 30–45 HRC.
Good Hardenability:
Deep hardening enables larger component sizes.
Excellent wear resistance:
Chromium and molybdenum promote the formation of hard carbides in the carburized layer, significantly improving surface wear resistance.
Excellent fatigue resistance:
The uniform, tempered sorbite structure in the core absorbs impact energy, inhibits crack propagation, and increases high-cycle fatigue life by more than 40% compared to ordinary alloy steels, making it suitable for alternating-load environments.
Excellent machinability:
Trace amounts of sulfides improve cutting performance, increasing cutting speed by 10–15% compared to ordinary medium carbon steel, with selectable feed rates of 0.12–0.18 mm/rev, and extending tool life by 20–30%.
Excellent heat-treatment stability:
High-dimensional stability after heat treatment, with a deformation rate of less than 0.05%, makes it suitable for machining precision parts.
Strong corrosion resistance:
Chromium provides mild corrosion resistance, suitable for water- or oil-containing environments.
High-temperature adaptability:
The addition of molybdenum enables the steel to maintain stable strength below 400℃, demonstrating creep resistance and adaptability to medium-temperature conditions.
18CrNiMo7-6 Alloy Steel Properties
17CrNiMo6 alloy steel physical properties information table.
| Properties | Metric | Metric Imperial |
|---|---|---|
|
Density |
7.85 g/cm3 |
490 lb/ft³ |
|
Melting point |
1400°C to 1460°C |
2550°F to 2660°F |
AISI 4130 alloy steel mechanical properties information table.
| Properties | Metric |
|---|---|
|
Tensile strength |
1050 – 1350 N/mm² (after heat treatment) |
|
Yield strength |
>830 MPa (for related grades/conditions) |
|
Toughness |
High, with impact toughness (Charpy-V) typically ≥ 40J at 20°C (for typical sizes). |
|
Surface Hardness |
58-63 HRC (after case hardening & tempering). |
|
Core Hardness |
35-45 HRC (after case hardening) |
|
Bending Fatigue Limit |
~580 MPa (higher than SAE 8620) |
|
Contact Fatigue Life |
~100 Million cycles (excellent for gears) |
AISI 4130 alloy steel thermal properties information table.
| Properties | Metric |
|---|---|
|
Thermal conductivity (@ 100°C) |
38 W/mK |
18CrNiMo7-6 Alloy Steel Chemical Composition
17CrNiMo6 alloy steel is a low-alloy steel with Chromium (Cr), Nickel (Ni), and Molybdenum (Mo).
| Standard | Steel Grade | Carbon, C | Silicon, Si | Manganese, Mn | Sulfur, S | Phosphorous, P | Chromium, Cr | Molybdenum, Mo | Nickel, Ni |
|---|---|---|---|---|---|---|---|---|---|
|
EN10084-2008 |
18CrNiMo7-6 |
0.15 – 0.21 |
≤ 0.4 |
0.5 – 0.9 |
≤0.035 |
≤ 0.025 |
1.5-1.8 |
0.25-0.35 |
1.4-1.7 |
17CrNiMo6 Steel Equivalent
| EU EN |
Germany DIN,WNr |
France AFNOR |
China GB |
Inter ISO |
|---|---|---|---|---|
|
18CrNiMo7-6 (1.6587) |
17CrNiMo6 |
18NCD6 |
17Cr2Ni2Mo |
18CrNiMo7 |
CUSTOM TOOL STEEL FORGINGS
18CrNiMo7-6 Steel Forgings Manufacturer
We are a leading supplier and manufacturer of 18CrNiMo7-6 steel forgings in China.
Our 18CrNiMo7-6 steel forgings exhibit excellent mechanical properties, including high hardness, high strength, excellent wear resistance, and high toughness. Our 18CrNiMo7-6 steel forgings are ideal blank materials for high-load parts requiring both surface wear resistance and core toughness.
Contact us today to request a quote for our 18CrNiMo7-6 steel forgings.
Records that travel
with the forging.
Inspection requirements are defined during quotation—not added as an afterthought. Available documentation is confirmed against the project specification before production.
Material certificates & heat traceability
✓
Dimensional inspection report
✓
Ultrasonic / magnetic particle report
✓
Mechanical properties report
✓
Final documentation package
✓
Have a drawing ready?
Send your drawing, material grade, dimensions, quantity and inspection requirements for manufacturing review.
MATERIALS WE FORGE
Carbon Steel Forgings
Custom carbon steel forgings for shafts, rings, discs, blocks and other heavy-duty industrial components.
Alloy Steel Forgings
High-strength alloy steel forgings for machinery, transmission systems and demanding service conditions.
Tool Steel Forgings
Custom tool steel forgings for dies, molds, industrial tooling and other high-load applications.
Stainless Steel Forgings
Corrosion-resistant forged components produced according to customer drawings and specifications.