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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Grade: 36CrNi3MoV Alloy Steel
36CrNi3MoV is a low-alloy Cr-Ni-Mo-V steel designed for large-section forgings in high-pressure service. Its composition features 1.20–1.50% Cr and 3.00–3.50% Ni to enhance hardenability and low-temperature toughness, 0.35–0.45% Mo for solid-solution strengthening, and 0.10–0.25% V for grain refinement and precipitation hardening. Tight limits on P (≤ 0.012%) and S (≤ 0.005%) ensure cleanliness and internal integrity, making this grade suitable for critical pressure vessel and heavy machinery applications.
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36CrNi3MoV
Qilu
36CrNi3MoV is a premium nickel-chromium-molybdenum-vanadium low alloy structural steel specially developed for pressure equipment. This steel grade delivers outstanding comprehensive mechanical strength, low-temperature toughness, hardenability and fatigue resistance after quenching & tempering treatment. It is the preferred material for heavy-duty ultra-high pressure vessel forgings and critical load-bearing components under harsh working conditions.
We supply customized 36CrNi3MoV steel forgings including shaft forgings, hollow cylinder forgings, ring forgings, block forgings and other special-shaped forgings. All products follow NB/T 47008-2017 specification, with complete metallurgical inspection reports and non-destructive testing (NDT) support.
Country | China |
Standard | NB/T 47008 |
Grade | 36CrNi3MoV |
Grade | C | Si | Mn | P | S | Cr | Mo | Ni | Cu | V |
36CrNi3MoV | 0.32-0.42 | 0.37 Max | 0.20-0.80 | 0.012 Max | 0.005 Max | 1.20-1.50 | 0.35-0.45 | 3.00-3.50 | 0.20 Max | 0.10-0.25 |
Normalizing + Quenching + Tempering (Tempering temperature ≥ 540°C)
| Dimension (Thickness) | Test Temp | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) |
| t ≤ 300 mm | -20℃ | 1000 – 1150 | ≥ 895 | ≥ 16 | ≥ 47 |
| 20℃ | ≥ 895 | — | — | — | |
| 100℃ | ≥ 814 | — | — | — | |
| 150℃ | ≥ 796 | — | — | — | |
| 200℃ | ≥ 783 | — | — | — | |
| 250℃ | ≥ 774 | — | — | — | |
| 300℃ | ≥ 761 | — | — | — | |
| 350℃ | ≥ 742 | — | — | — | |
| 400℃ | ≥ 714 | — | — | — |
Additional Notes:
Lateral Expansion (LE): ≥ 0.53 mm
Alternative Impact Test: -40°C may be used upon agreement
Austenitizing temperature: 830–860 ℃, holding fully, water quenching.
Tempering range: 580–620 ℃, minimum tempering temperature ≥ 540 ℃, air cooling after soaking.
After QT treatment, the microstructure is uniform tempered martensite, balancing strength, plasticity and impact resistance. Stress relief annealing can be arranged after rough machining to eliminate forging and processing residual stress.
Forging Process: Multi-directional forging (upsetting and drawing) to optimize grain flow along stress directions.
Quality Control: Stringent ultrasonic testing (UT) per NB/T 47008-2017 standards to ensure internal soundness.
Customization: Available in various dimensions (typically 8mm – 6500mm depending on shape) and configurations (round bars, blocks, custom shapes)
Forging Forms: Solid shaft forgings, hollow cylindrical forgings, ring forgings, rectangular block forgings, irregular special forgings
Size Range: Customized according to customer drawings
Delivery State: Quenched & tempered (QT), normalized & tempered, annealed; rough machined / black forged surface
Quality Certification: EN 10204 3.1 / 3.2 material test certificate, 100% NDT on request
Ultra-high pressure vessels, autofrettaged cylinders, and boiler components .
Outer cylinders, transmission systems, and hydraulic components subjected to heavy loads and vibrations .
Tank gun barrels and artillery components .
Critical structural components requiring consistent mechanical properties through large cross-sections .
A1: It is primarily specified under the Chinese standard NB/T 47008-2017 for “Carbon and alloy steel forgings for pressure equipment” .
A2: 36CrNi3MoV offers slightly higher tensile strength (≥895 MPa vs ≥960 MPa for 35CrNi3MoV) and yield point, with a lower tempering temperature requirement .
A3: Current research indicates that austenitizing at 830-860°C, followed by water quenching and tempering at 600°C, yields a tempered martensite structure with the best balance of strength and impact resistance .
A4: Yes. It maintains excellent impact resistance at low temperatures, with minimum impact energy values guaranteed at -20°C or even -40°C upon agreement .
For more information or to request a quote, don't hesitate to get in touch with our team.
