Are you searching for high-performance stainless steel heat exchanger tubes capable of withstanding extreme temperatures and harsh operating conditions? GNEE is a trusted global supplier with over 18 years of experience in providing top-tier stainless steel products. Our clientele spans more than 50 countries, and our annual export volume exceeds 5,000 tons. We hold numerous certifications-including ISO 9001 and PED-and strictly adhere to industry standards, ensuring the highest quality and reliability for heat exchanger applications.
Our EN 1.4901 stainless steel heat exchanger tubes are specifically engineered for high-temperature, high-stress environments. Produced in strict compliance with EN 10216-5 and EN 10297-2 standards, these tubes exhibit exceptional thermal stability; at 650°C, their creep rupture strength after 10,000 hours is ≥48 MPa far exceeding the performance of standard 1.4903 and 310S grades.
EN 1.4901 stainless steel seamless tubes undergo a specialized normalizing-plus-tempering heat treatment process. Through precise control of the normalizing temperature (980–1020°C) and tempering temperature (730–780°C), we achieve a 25–30% grain refinement. This process boosts tensile strength to 620–850 MPa, yield strength to >450 MPa, and elongation to >20%. This treatment effectively eliminates internal stresses, prevents high-temperature deformation, and ensures long-term structural integrity under cyclic thermal loads.
We offer EN 1.4901 seamless tubes produced via both cold-drawn and hot-rolled processes. Our product range covers outer diameters from 6 mm to 76 mm, with wall thicknesses ranging from 1.0 mm to 8.0 mm. Standard lengths include 6 m, 9 m, and 12 m; additionally, we provide customized cutting and chamfering services tailored to specific client requirements.
We guarantee that every batch of tubing complies with ASTM, ASME, and EN standards, ensuring full traceability through PMI (Positive Material Identification) and spectroscopic analysis. We stand behind our products, guaranteeing 100% conformity to all required specifications.
EN 1.4901 Stainless Steel Round Tubes Specification
| Standard | EN 10216-2 (Seamless steel tubes for pressure purposes) |
| Outer Diameter (OD) | 10.3 mm – 219.1 mm |
| Wall Thickness (WT) | 1.0 mm – 25 mm |
| Length | Single Random, Double Random, or Fixed Length (up to 24m) |
| Heat Treatment | Normalizing (1040°C-1090°C) + Tempering (730°C-780°C) |
| Testing Available | Hydrostatic, Ultrasonic (UT), Eddy Current (ET), Grain Size, Creep Test |
Chemical Composition (%)
The precise balance of Vanadium, Niobium, and Tungsten provides this grade with its superior thermal stability.
| Elements | C | Si | Mn | P | S | Cr | Mo | W | V | Nb | N |
| Min | 0.09 | - | 0.30 | - | - | 8.50 | 0.90 | 0.90 | 0.18 | 0.06 | 0.03 |
| Max | 0.13 | 0.50 | 0.60 | 0.020 | 0.010 | 9.50 | 1.10 | 1.10 | 0.25 | 0.10 | 0.07 |
Mechanical Properties (at Room Temperature)
EN 1.4901 tubes are typically supplied in the Normalized and Tempered (N+T) condition to ensure a stable martensitic structure.
| Property | Value (Minimum) |
| Tensile Strength (Rm) | 640 – 820 MPa |
| Yield Strength (ReH) | ≥ 450 MPa |
| Elongation (A5) | ≥ 17% (Longitudinal) |
| Impact Energy (KV2) | ≥ 40 J (at +20°C) |
| Hardness (Brinell) | 190 – 250 HBW |
High-Temperature Creep Rupture Strength (Reference)
The primary advantage of EN 1.4901 is its performance under stress at elevated temperatures.
| Temperature (°C) | Estimated 100,000h Creep Rupture Strength (MPa) |
| 550°C | ~ 160 – 180 |
| 600°C | ~ 100 – 120 |
| 620°C | ~ 80 – 95 |
Physical Properties
| Property | Value (at 20°C) |
| Density | 7.78 g/cm³ |
| Thermal Conductivity | 24 W/(m·K) |
| Modulus of Elasticity | 210 GPa |
| Thermal Expansion Coeff. | 10.9 x 10-6/K (at 20-200°C) |
EN 1.4901 stainless steel pipe vs. P91 pipe
EN 1.4901 (also known as X10CrWMoVNb9-2 or Grade 92) and P91 (ASTM A335 Grade P91) are both high-performance, creep-resistant steel pipes designed for extreme high-temperature and high-pressure environments, such as power plant boilers and steam lines. EN 1.4901 is an improved version of P91, offering superior strength and higher temperature resistance due to the addition of tungsten.
NDT – Non-Destructive Testing
Eddy Current Testing (ET) & Ultrasonic Testing (UT): 100% full-length inspection of the tube was performed.
Hydrostatic Test: Confirmed absence of leaks at the design pressure.
Grain Size Testing: Fine grain size contributes to enhanced material fatigue strength and corrosion resistance.
Specialized Packaging Methods
| Packaging Type | Best For | Protection Level |
| Hexagonal Bundles | Standard seamless pipes, large OD pipes. | High-strength steel strapping with nylon lifting slings for easy unloading. |
| Woven Bag Wrapping | Cold-drawn pipes with sensitive surface finishes. | Prevents friction and metal-to-metal contact during container movement. |
| Plywood Cases / Steel-Framed Crates | Heat exchanger tubes (thin wall) or small OD pipes. | Maximum Protection. Prevents bending and protects against salt-air corrosion. Recommended for all sea freight. |
