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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
3m
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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
