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DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
Specifications
Brand Name :
DELTA
Model Number :
DIN 1.8159 (25CrMoV6-4)
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
Description

DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance

Products Specification

Products Name

DIN 1.8159 (25CrMoVr6-4) Alloy 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
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Bar – High-Temperature Strength & Excellent Creep Resistance for Demanding Industrial Applications

Overview

DIN 1.8159, also designated as 25CrMoVr6-4 under the European EN standard, is a premium-grade chromium-molybdenum-vanadium alloy steel engineered specifically for applications requiring exceptional mechanical performance at elevated temperatures. This high-alloy steel round bar combines high tensile strength, outstanding creep resistance, and excellent fatigue endurance, making it a preferred choice in critical sectors such as power generation, aerospace, oil & gas, and heavy machinery.
Manufactured to stringent metallurgical controls, DIN 1.8159 round bars are typically supplied in quenched and tempered (Q&T) condition to achieve optimal microstructure—primarily tempered martensite or bainite—that delivers a balanced combination of hardness, toughness, and thermal stability.

Key Features & Benefits

  • ✅ Superior Creep Resistance: Maintains structural integrity under prolonged stress at temperatures up to 550°C (1022°F).
  • ✅ High Hot Hardness & Thermal Stability: Resists softening during high-temperature service.
  • ✅ Excellent Fatigue Strength: Ideal for cyclic loading environments like turbine rotors and crankshafts.
  • ✅ Good Weldability (with pre/post-heat treatment): Enables fabrication of complex components.
  • ✅ Uniform Microstructure & Cleanliness: Produced via electric arc furnace (EAF) + ladle refining + vacuum degassing for minimal impurities (low S, P).
  • ✅ Machinability in Annealed Condition: Can be precision-machined before final heat treatment.

Typical Chemical Composition (Weight %)

Element C Si Mn Cr Mo V Ni P (max) S (max)
Range 0.22–0.29 ≤0.40 0.40–0.70 1.30–1.70 0.25–0.35 0.10–0.20 ≤0.30 0.025 0.020
Note: Exact composition may vary slightly based on manufacturer specifications and customer requirements.
The synergistic effect of Cr, Mo, and V enhances hardenability, refines grain structure, and forms stable carbides that resist coarsening at high temperatures—key to long-term creep resistance.

Mechanical Properties (Quenched & Tempered Condition)

Property Typical Value
Tensile Strength (Rm) 900–1100 MPa
Yield Strength (Rp0.2) ≥750 MPa
Elongation (A5) ≥12%
Reduction of Area (Z) ≥50%
Hardness 28–34 HRC
Impact Toughness (Charpy V, -20°C) ≥40 J
Creep Rupture Strength (at 500°C / 10⁵ h) ～120 MPa
Values are representative; actual properties depend on section size, heat treatment parameters, and testing standards (e.g., EN 10083-3).

Heat Treatment Guidelines

Proper heat treatment is critical to unlocking the full potential of DIN 1.8159:
  1. Stress Relieving: 600–650°C, slow cool — for machined parts prior to final hardening.
  2. Austenitizing: 860–890°C (soak time based on diameter), followed by oil quenching.
  3. Tempering: 600–680°C (typically 620–650°C for optimal creep/toughness balance), air cool.
    • Double tempering recommended for critical applications to ensure dimensional stability.

Common Applications

DIN 1.8159 round bars are specified in components subjected to high thermal and mechanical loads, including:
  • Steam turbine shafts and rotors
  • High-pressure boiler tubes and headers
  • Gas turbine blades and discs (non-bladed sections)
  • Crankshafts and connecting rods in high-performance engines
  • Downhole drilling tools in sour (H₂S-containing) environments
  • Fasteners and bolts for power plant flanges
  • Valve stems and spindles in petrochemical plants
Its resistance to hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SSCC)—when properly processed—makes it suitable for use in aggressive environments per NACE MR0175/ISO 15156 guidelines.

Comparison with Similar Grades

Grade (Standard) Key Alloying Elements Max Service Temp Primary Use Case
DIN 1.8159 (25CrMoVr6-4) Cr-Mo-V 550°C Turbine rotors, high-temp shafts
DIN 1.7225 (25CrMo4) Cr-Mo (no V) 500°C General high-strength shafts
AISI 4140 Cr-Mo 425°C Oil & gas, automotive
ASTM A182 F22 Cl.3 2.25Cr-1Mo 565°C Pressure vessels, piping
DIN 1.6959 (34CrNiMo6) Ni-Cr-Mo 300°C High-toughness gears, axles
1.8159 outperforms 25CrMo4 in creep resistance due to vanadium addition, which stabilizes fine carbides during long-term exposure.

Available Forms & Dimensions

  • Form: Hot-rolled, forged, or cold-drawn round bars
  • Diameter Range:
    • Hot-rolled: Ø20 mm to Ø300 mm
    • Forged: Ø100 mm to Ø800 mm (custom sizes available)
    • Cold-drawn: Ø10 mm to Ø80 mm (for precision applications)
  • Length: 3,000–6,000 mm (standard); cut-to-length upon request
  • Surface Finish: Black (as-rolled), peeled, turned, or ground
  • Certification: EN 10204 3.1 / 3.2, Mill Test Report (MTR), chemical & mechanical test data

Machining & Fabrication Tips

  • Machinability: Good in annealed condition (～180 HB); use carbide tools, moderate speeds, and adequate coolant.
  • Welding: Requires preheating (250–350°C) and post-weld heat treatment (PWHT at 650–700°C) to avoid hydrogen cracking and restore mechanical properties.
  • Grinding: Standard procedures apply; avoid overheating to prevent surface rehardening or microcracks.

Quality Assurance & Standards Compliance

DIN 1.8159 round bars are manufactured in accordance with:
  • EN 10083-3: Technical delivery conditions for alloy steels
  • ISO 683-2: Heat-treatable steels, alloy steels
  • ASTM A322 / A331 (equivalent US practices)
  • Additional testing per customer request:
    • Ultrasonic testing (UT) per EN 10228-3
    • Macro/microstructure analysis
    • Hardenability (Jominy test)
    • Non-metallic inclusion rating (ASTM E45)

Why Choose DIN 1.8159?

In an era where energy efficiency and equipment longevity are paramount, DIN 1.8159 (25CrMoVr6-4) offers a scientifically optimized alloy system that bridges the gap between cost and performance. Its vanadium-enhanced microstructure ensures that components maintain dimensional accuracy and load-bearing capacity over decades of service—even under extreme thermal cycling.
Whether you're designing the next-generation combined-cycle power plant or upgrading offshore drilling equipment, this alloy steel provides the reliability, safety margin, and lifecycle cost savings that engineers demand.

Contact Us

For technical datasheets, custom heat treatment protocols, or bulk quotations on DIN 1.8159 alloy steel round bars, please contact our materials engineering team. We support global shipping with full traceability and compliance documentation.
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep ResistanceDIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep ResistanceDIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep ResistanceDIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
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DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance

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Product Detail
Brand Name :
DELTA
Model Number :
DIN 1.8159 (25CrMoV6-4)
Certification :
ISO
Place of Origin :
China
MOQ :
1 Ton
Price :
600-850 USD/Ton
Contact Supplier
video
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance
DIN 1.8159 (25CrMoVr6-4) Alloy Steel Round Barr High-Temperature Strength & Excellent Creep Resistance

JIANGSU MITTEL STEEL INDUSTRIAL LIMITED

Verified Supplier
4 Years
jiangsu, wuxi
Business Type :
Manufacturer, Distributor/Wholesaler, Exporter
Main Products :
stainless steel roofing sheet, Stainless Steel Strip, Others stainless steel sheet
Total Annual :
>1000000
Employee Number :
>100
Certification Level :
Verified Supplier
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