Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of 36crnimo4 1.6511 35ncd4 structural steel in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
36CrNiMo4 1.6511 35NCD4 Structural Steel
36CrNiMo4, also known as 1.6511 or 35NCD4, is a structural alloy steel with excellent high tensile strength that resists deformation and fracture even under extreme conditions. This steel grade has a high degree of heat and wear resistance, ensuring a long service life in any application. It is commonly used in applications that require high durability and durability, such as heavy machinery, automotive parts, and gearboxes.
In order to achieve the best performance of 36CrNiMo4, it is important to follow proper heat treatment procedures, including annealing, quenching and tempering, as well as ensuring proper machining and welding practices.
| Grade : | 36CrNiMo4 | ||
| Number: | 1.6511 | ||
| Classification: | Alloy special steel | ||
| Standard: |
|
Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo |
| 36CrNiMo4/1.6511 | 0.32-0.4 | ≤ 0.4 | 0.5-0.8 | ≤ 0.035 | ≤ 0.035 | 0.9-1.2 | 0.9-1.2 | 0.15-0.3 |
36crnimo4 equivalent material
A low-alloy quenched-and-tempered steel optimized for high-strength applications. Key chemical composition (%):
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
| 4340 | 0.38-0.43 | 0.60-0.80 | 0.035 | 0.04 | 0.15-0.35 | 1.65-2.00 | 0.70-0.90 | 0.20-0.30 |
| EN24/817M40 | 0.36-0.44 | 0.45-0.70 | 0.035 | 0.04 | 0.1-0.40 | 1.3-1.7 | 1.00-1.40 | 0.20-0.35 |
| SNCM 439/SNCM8 | 0.36-0.43 | 0.60-0.90 | 0.03 | 0.03 | 0.15-0.35 | 1.60-2.00 | 0.60-1.00 | 0.15-0.30 |
Key Mechanical Properties & Advantages
|
Property |
Typical Value (Quenched & Tempered) |
Application Benefit |
|
Tensile Strength |
980–1180 MPa |
Ideal for components under extreme static/dynamic loads (e.g., bridges, gearboxes) |
|
Yield Strength |
≥835 MPa |
Resists permanent deformation in high-stress environments |
|
Impact Toughness (KV2) |
≥47 J @ 20°C |
Maintains ductility in cold climates (-40°C capable), reducing fracture risks |
|
Hardness (HB) |
280–340 HB |
Balances machinability with wear resistance for complex part production |
|
Hardenability (Jominy) |
Up to 50mm depth @ ≥50 HRC |
Ensures uniform hardness in thick sections (critical for large forgings) |
about us
We are a company specializing in steel supply, with many years of industry experience and quality supply chain resources. The company is committed to providing customers with high quality, stable value steel products.
We have an efficient and professional sales team, they have rich steel knowledge and skills, can provide customers with comprehensive steel solutions and high quality after-sales service.
Stocking Flexibility:
Standard Sizes: Bars (φ20–300mm), plates (10–150mm thickness), ready for immediate shipment.
Custom Solutions: Tailored dimensions (up to 600mm bar diameter, 300mm plate thickness) and shapes for large-scale projects.
FAQ
Q: Is 36CrNiMo4 equivalent to AISI 4340?
A: Yes, they are very close equivalents. The mechanical properties meet the same requirements for high-strength machinery, but Chinese-milled 36CrNiMo4 with EN 10250 certification offers a more competitive price than imported 4340. (Substitution approval must be confirmed by your design engineer.)
Q: What quenching medium should I use for thick sections to avoid cracking?
A: You should oil-quench thick sections (over 50mm). Water quenching is too severe and will cause cracking due to high hardenability. Temper immediately at 550–650°C. We can provide the mill's recommended heat treatment chart.
Q: Do you supply pre-hardened and tempered 36CrNiMo4?
A: Yes. We arrange pre-hardened (+QT) to 280–320 HB through our qualified partner heat treaters. This saves you from heat-treating large molds and shafts, and we machine the surface for flatness before shipping.
Q: Can you supply large forged blocks for heavy machinery?
A: Yes. The base material is produced at our in-house production base. We supply forged blocks up to 300mm thickness, rough-machined to ±3mm allowance. We provide normalized or +QT condition with UT reports proving no internal defects.
Q: How does the weldability of 36CrNiMo4 compare to carbon steel?
A: It is much worse. High carbon and alloy content make it prone to cold cracking. If you must weld, preheat to 200–300°C, use low-hydrogen electrodes, and post-weld temper. For most applications, machining or bolting is better.
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