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Brand Name : DELTA
Model Number : 31CrMoV9(1.8509)/ 38CrMoAlA
Certification : ISO
Place of Origin : China
MOQ : 1 Ton
Price : 600-850 USD/Ton
Payment Terms : L/C, T/T, Western Union
Supply Ability : 20Ton per week
Delivery Time : 5 - 12 days based on the quantity
Packaging Details : standard packing for export
Products Name : Alloy Steel Round Bar
Diameter : 10 - 300mm
Length : 6m
Tech : Hot rolled
Service : Cutting
MOQ : 1 Ton
Loading Port : Shanghai Port
Standard : ASTM EN GB
31CrMoV9 / 31CrMoV9 / 1.8509 Round Steel For Construction & Machinery
Products Specification
Products Name | 38CrMoAlA/1.8509 Nitriding Steel Round Bar |
Diameter | 10 - 300 mm |
Length | 6m or custom cutting any length as request |
Type | Hot Rolled |
Brand | BAOSTEEL DELTA DONGBEI HUAXI SHAGANG.etc |
MOQ | 1 Ton |
Loading Port | Shanghai Port |
Packing | packing by steel wire rope |
Deliver time | 5 - 7 days for stock materials |
Other Grade | Q195,Q235,10#,20#,35#,45#,Q215,Q345,12Cr1Mov,15CrMo,304,3 16,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,5CrMnMo ,38CrMoAl, 31CrMoV9 |
Standard | ASTM GB EN DIN |
Application | Structure and Industrial |
Standard Size of our Steel Round Bar In Stock
10mm | 12mm | 15mm | 16mm | 18mm | 20mm |
25mm | 30mm | 35mm | 38mm | 40mm | 42mm |
45mm | 48mm | 50mm | 55mm | 60mm | 65mm |
70mm | 75mm | 80mm | 85mm | 90mm | 95mm |
105mm | 110mm | 115mm | 120mm | 130mm | 140mm |
150mm | 160mm | 170mm | 180mm | 190mm | 200mm |
210mm | 220mm | 230mm | 240mm | 250mm | 260mm |
270mm | 280mm | 290mm | 300mm | 310mm | 320mm |
Grade Compliance: DIN 1.8509 / GB 38CrMoAlA / UNS – (Custom Equivalent)
38CrMoAlA/1.8509 is a premium nitriding steel optimized for applications demanding extreme surface hardness and core toughness. Its unique aluminum-chromium-molybdenum composition enables deep nitrogen diffusion during nitriding, producing components resistant to wear, corrosion, and thermal fatigue.
Ultra-Hard Surface Layer: Achieves 900-1100 HV after nitriding, ideal for abrasive environments.
Stable Core Properties: Maintains high tensile strength (≥980 MPa) and ductility even under cyclic loads.
Precision Machinability: Pre-hardened state allows efficient machining prior to final nitriding.
Dimensional Stability: Minimal distortion during heat treatment for tight-tolerance applications.
C: 0.35–0.42 | Cr: 1.35–1.65 | Mo: 0.15–0.25
Al: 0.70–1.10 | Mn: 0.30–0.60 | Si: 0.20–0.45
Impurities (max): P: 0.025 | S: 0.025
Density: 7.85 g/cm³
Thermal Conductivity: 42 W/m·K (at 20°C)
Coefficient of Thermal Expansion: 11.5 ×10⁻⁶/K (20–300°C)
Forging: Heat to 1150–1200°C; finish forging above 850°C.
Annealing: 680–720°C slow cooling to ≤200 HB for improved machinability.
Final Heat Treatment:
Quenching: 930–950°C oil cooling.
Tempering: 550–650°C (adjust for target hardness).
Nitriding: Gas/plasma nitriding at 480–530°C for 20–100h (case depth: 0.2–0.8mm).
High-Precision Components: Camshafts, gear synchronizers, bearing races.
Tooling & Dies: Extrusion dies, injection molding cores with anti-galling surfaces.
Oil & Gas: Valve stems, pump shafts exposed to corrosive media.
Automotive: Turbocharger parts, fuel injection systems.
Sizes: Ø10mm – Ø350mm (cold-drawn or hot-rolled).
Surface Finish: Peeled, ground, or black oxide-coated.
Certifications: RoHS compliant, ISO 9001:2015, batch-specific chemical/mechanical reports.
Custom Services: Pre-cut blanks, stress-relieved stock, partial nitriding masking.
Testing Protocols:
Hardness gradient analysis (core vs. case).
Microstructure inspection for nitride layer uniformity.
Fatigue testing per ISO 12107.
Traceability: Full material history (heat number, mill origin).
Consistent Performance: Vacuum degassed steel for low inclusion ratings.
Global Logistics: Stocked in EU, Asia, and Americas warehouses.
Technical Support: Free nitriding parameter optimization guides.
Contact Us: For specialized requirements (e.g., cryogenic treatment, PVD coating compatibility).
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31CrMoV9 / 31CrMoV9 / 1.8509 Round Steel For Construction Machinery Images |