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

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

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

MOQ： 1 Ton
Price： 600-850 USD/Ton
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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
Brand Name	DELTA
Model Number	DIN 1.8159 (25CrMoV6-4)
Certification	ISO
Place of Origin	China

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Product Specification


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
Brand Name	DELTA	Model Number	DIN 1.8159 (25CrMoV6-4)
Certification	ISO	Place of Origin	China
High Light	DIN 1.8159 alloy steel round bar ，25CrMoVr6-4 high-temperature steel bar ，creep resistant steel round bar

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:

Stress Relieving: 600–650°C, slow cool — for machined parts prior to final hardening.
Austenitizing: 860–890°C (soak time based on diameter), followed by oil quenching.
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.

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