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EN 1.4418 (04Cr16Ni5Mo) Stainless Steel Round Bar – High Toughness Martensitic Bar for Oil, Gas & Hydropower Industries

Place of Origin	China
Brand Name	Delta
Certification	ISO 9001
Model Number	1.4418
Minimum Order Quantity	500 kgs
Price	3.5 - 5.5 USD/Kg
Packaging Details	wooden box or water resistant paper surround
Delivery Time	5 - 10 days
Payment Terms	T/T, Western Union
Supply Ability	50 Ton per Month

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Product Details

Products Name	1.4418 Stainless Steel Bar	Diameter	10 - 350mm
Length	6m Or Cutting Any Length As Request	Surface	Black Or Polishing
Service	Cutting	Standard	ASTM DIN GB EN
Other Products	Round Bar, Square Bar, Flat Bar.etc	Technique	Hot Rolled

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Product Description

EN 1.4418 (04Cr16Ni5Mo) Stainless Steel Round Bar – High Toughness Martensitic Bar for Oil, Gas & Hydropower Industries

Products Specification

Products Name	1.4418 Stainless Steel Round Bar
Grade	303,303Cu,304,304L,309S,310S,310H,316L,316Ti,316H,317L,321,329,347,410,415,420, 430F,431,440A/B/C,2205,2507,904l,254SMO,253MA,CD4MCU,XM-19,17-4PH,15-5PH,17-7PH,660,C276,600,601,625,718,800,800H,825,926.etc
Products Diameter Range	φ3mm - φ350mm
Length	6m/pcs or cutting any length as request
Surface	Pickling finishing, bright finishing
Standard	ASTM JIS,GB,DIN EN
Service	Cutting
Other Shape	Square , Flat, Hexagonal, Round.etc
Loading Port	Shanghai Port
MOQ	50 kgs

EN 1.4418 (04Cr16Ni5Mo) Stainless Steel Round Bar – High Toughness Martensitic Bar for Oil, Gas & Hydropower Industries

EN 1.4418 (also known as X4CrNiMo16-5-1 and domestic grade 04Cr16Ni5Mo) is a premium low-carbon martensitic stainless steel round bar engineered to deliver an exceptional balance of high strength, superior toughness, and outstanding corrosion resistance. Designed specifically for the rigorous demands of oil, gas, and hydropower industries, this alloy outperforms conventional martensitic stainless steels through its optimized chemical composition and tempered martensitic microstructure. Its unique properties make it a reliable choice for critical components operating in harsh, corrosive, and high-load environments, ensuring long-term durability and reduced maintenance costs.

Core Chemical Composition

The exceptional performance of EN 1.4418 stems from its precisely balanced chemical composition, which combines low carbon content with chromium, nickel, and molybdenum to enhance strength, toughness, and corrosion resistance. The following table outlines the chemical composition ranges (mass fraction) in compliance with EN 10088-2:2005 standard:

Silicon (Si)

≤0.70%

Assists in deoxidation and improves high-temperature oxidation resistance.

Phosphorus (P)

≤0.040%

Strictly controlled to avoid cold brittleness and processing cracks.

Sulfur (S)

≤0.015%

Low sulfur content guarantees material toughness and surface finish during processing.

Nitrogen (N)

≥0.02%

Enhances structural stability and supplementary corrosion resistance.

Key Mechanical Properties

EN 1.4418 round bar exhibits excellent comprehensive mechanical properties after quenching and tempering (QT) treatment, particularly in QT900 state. It maintains high strength while delivering superior toughness even at low temperatures, making it suitable for heavy-load and dynamic stress applications. The following mechanical properties are achieved in the tempered state:

Property

Value Range

Test Condition

Tensile Strength (Rm)

900-1100 MPa

QT900 State

Yield Strength (Re)

≥550 MPa

QT900 State

Elongation (A)

≥15%

Room Temperature

Impact Toughness (Akv)

≥50 J

-40℃ Low Temperature

Brinell Hardness (HB)

≤324 HB

QT900 State

Notably, its chloride stress corrosion resistance is three times that of 304 stainless steel, with an annual corrosion rate of less than 0.1mm in 10% sulfuric acid. The pitting resistance equivalent (PREN) of approximately 28 further confirms its excellent resistance to pitting and crevice corrosion in chloride-containing environments.

Heat Treatment & Processing Performance

Heat Treatment Process

The performance of EN 1.4418 is closely linked to proper heat treatment, with quenching and tempering as the core processes to adjust its microstructure and properties:

•

Quenching: Heat to 1020-1100℃, followed by oil cooling or air cooling. This process fully transforms austenite into martensite, laying the foundation for high strength and refining grains.

•

Tempering: Hold at 480-620℃ for 4-6 hours, then cool. This step eliminates quenching residual stress, adjusts the structure to balance strength and toughness, and avoids brittleness caused by prolonged holding around 475℃.

Processing & Welding

The alloy supports both hot and cold working, though cold working exhibits a high work hardening rate that requires controlled deformation. For machining, cemented carbide tools are recommended, paired with medium-speed cutting and efficient cooling to ensure surface quality. In terms of welding, TIG/MIG processes are preferred, with preheating at 100-250℃ and 1.4430 welding wire. Moderate tempering after welding prevents structural brittleness, eliminating the need for complex post-heating processes.

Product Specifications & Supply

EN 1.4418 round bars are available in various processing states and sizes to meet diverse industrial needs, with strict compliance with international standards:

Processing State

Diameter Range

Length

Standard

Bright Drawn/Ground

10mm-80mm

DIN EN 10278 (Tolerance H9)

Hot Rolled/Forged

25mm-705mm

4-6m

DIN EN 10060

All products are supplied with EN 10204/3.1 certificates, ensuring traceability and compliance with quality requirements. Custom sizes for blocks, flats, and plates (10mm-50mm thickness) are available upon request.

Applications in Oil, Gas & Hydropower Industries

Thanks to its robust performance, EN 1.4418 round bar is widely adopted in critical components across oil, gas, and hydropower sectors, where reliability and durability are paramount:

•

Oil & Gas Industry: Ideal for subsea valves, connecting flanges, transmission structural parts, and offshore oil platform support structures. It resists corrosion from hydrogen sulfide and chloride-containing media, with a service life exceeding 25 years in marine environments.

•

Hydropower Industry: Used in turbine components, pump casings, seal sleeves, and propeller shafts. Its excellent low-temperature toughness and fatigue resistance ensure stable operation under dynamic loads and alternating water pressures.

•

Other High-Demand Fields: Also applied in marine engineering (ship propellers, seawater pipelines), nuclear power valves, and high-pressure reactors, adapting to harsh working conditions with ease.

Conclusion

EN 1.4418 (04Cr16Ni5Mo) stainless steel round bar stands out as a high-performance martensitic alloy, combining high strength, superior toughness, and excellent corrosion resistance. Its optimized design addresses the challenges of harsh environments in oil, gas, and hydropower industries, reducing maintenance costs and improving operational safety. As the demand for high-reliability materials grows, EN 1.4418 continues to be a preferred choice for critical engineering applications, delivering consistent performance and long-term value.

EN 1.4418 (04Cr16Ni5Mo) Stainless Steel Round Bar – High Toughness Martensitic Bar for Oil, Gas & Hydropower Industries 0

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EN 1.4418 (04Cr16Ni5Mo) Stainless Steel Round Bar – High Toughness Martensitic Bar for Oil, Gas & Hydropower Industries

EN 1.4418 (04Cr16Ni5Mo) Stainless Steel Round Bar – High Toughness Martensitic Bar for Oil, Gas & Hydropower Industries

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