X10CrNiMoMnNbVB15-10-1 (EN material number 1.4982, UNS S21500, also known commercially as Esshete 1250) is a fully austenitic Cr-Ni-Mo-Mn-Nb-V-B creep-resistant stainless steel engineered for prolonged high-temperature service up to 650 C (1200 F). This grade was originally developed in the United Kingdom in the 1960s for the power generation sector and has since been adopted across boiler, pressure vessel, aerospace, and chemical processing industries worldwide. FUSHUN METAL produces X10CrNiMoMnNbVB15-10-1 / 1.4982 / S21500 through a triple-melt pathway combining VIM, VAR, and PESR, ensuring ultra-low inclusion content, tight compositional control, and superior structural homogeneity for the most demanding high-temperature applications.
Equivalent Grades of X10CrNiMoMnNbVB15-10-1 Across International Standards
| Standard | Designation | Remarks |
|---|---|---|
| EN | X10CrNiMoMnNbVB15-10-1 / 1.4982 | EN 10088-1, EN 10269, EN 10216-5 |
| ASTM / UNS | S21500 | ASTM A213, ASTM A959 |
| ISO | X10CrNiMoMnNbVB15-10-1 / 4982-215-00-E | ISO 4955, ISO 15510 |
| DIN | X10CrNiMoMnNbVB15-10-1 / 1.4982 | DIN EN 10269 |
| VdTUV | Werkstoffblatt 520 | Pressure vessel approval |
| Trademark | Esshete 1250 | Corus / Sandvik (Alleima) |
Key Applications of 1.4982 / S21500
Power Generation
- Superheater and reheater tube bundles for coal-fired boilers (500-660 MW units, steam at 570 C / 170 bar)
- Biomass and waste-to-energy boiler superheaters (540-580 C, 60-200 bar)
- Boiler header stubs, transition joints, and pendant support brackets
- Heat exchanger tubing for CCGT and HRSG systems
Fasteners & Pressure Vessels
- High-temperature bolts, studs, nuts, and washers per EN 10269 for flanged joints above 500 C
- Tie rods and tensioning bars in pressure vessel internals
- PED-compliant (2014/68/EU) pressure-retaining fasteners for petrochemical reactors
Aerospace & Turbomachinery
- Aero-engine casing rings, structural brackets, and high-strength corrosion-resistant fasteners up to 800 C
- Gas turbine combustion chamber support hardware and transition duct liners
- Rocket engine hot-section structural parts
Chemical & Nuclear
- High-temperature chemical reactors, cracking furnace tubes, and reformer pigtails
- Nuclear steam generator internal hardware and core support structures
- Corrosion-resistant piping in sour-gas and high-chloride coal-combustion environments
FUSHUN METAL supplies 1.4982 / S21500 in solution-annealed condition with full mill test certificates. Our ISO 9001 and AS9120B quality system governs every heat lot from triple-melt VIM+VAR+PESR through to final ultrasonic and eddy-current inspection, ensuring full traceability and compliance with ASTM A213, EN 10269, and VdTUV 520.
Supply Range of X10CrNiMoMnNbVB15-10-1 / 1.4982
Rolled Products
| Form | Diameter / Thickness (mm) | Length (mm) |
|---|---|---|
| Hot-rolled round bar | 10 – 300 | 2000 – 12000 |
| Hot-rolled flat bar | T: 5 – 80, W: 20 – 200 | 2000 – 6000 |
| Cold-drawn round bar | 5 – 80 | 2000 – 6000 |
Forged Products & Tubing
| Form | Diameter / Size (mm) | Length (mm) |
|---|---|---|
| Forged round bar | 100 – 800 | 1500 – 8000 |
| Forged flat / block | T: 20 – 400, W: 100 – 600 | 1000 – 5000 |
| Seamless tube / pipe | OD: 6 – 260, WT: 0.5 – 40 | Up to 14000 |
FUSHUN METAL offers X10CrNiMoMnNbVB15-10-1 in solution-annealed (1050-1150 C, rapid quench), bright-annealed, or rough-turned finishes. Non-standard intermediate sizes, step shafts, and custom forged shapes are available on request. Each shipment is accompanied by an EN 10204 3.1 or 3.2 certificate under our ISO 9001 / AS9120B quality management system.
Chemical Composition of X10CrNiMoMnNbVB15-10-1 per EN 10269
| C | Si | Mn | P | S | Cr | Ni | Mo | N | V | Nb | B |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.07 – 0.13 | 1.00 max | 5.50 – 7.00 | 0.040 max | 0.030 max | 14.0 – 16.0 | 9.0 – 11.0 | 0.80 – 1.20 | 0.10 max | 0.15 – 0.40 | 0.75 – 1.25 | 0.003 – 0.009 |
FUSHUN METAL controls each heat of X10CrNiMoMnNbVB15-10-1 through VIM for precise chemistry, VAR for macro-cleanliness and gas reduction, and PESR for superior ingot solidification. The high manganese content (5.5-7.0%) partially substitutes nickel while enhancing nitrogen solubility, and the controlled boron (0.003-0.009%) and niobium additions deliver the grade’s signature creep strength through fine carbide and carbonitride precipitation during service. All heats are spectrometrically verified and certified to EN 10269 and ASTM A959.
Mechanical Properties of 1.4982 / S21500 at Room Temperature
| Condition / Standard | Tensile Strength Rm (MPa) | Yield Strength Rp0.2 (MPa) | Elongation A (%) | Hardness (HRB) | Impact KV2 (J) |
|---|---|---|---|---|---|
| Solution annealed +AT+WW (EN 10269, d 100 mm) | 650 – 850 | 510 min | 25 min | – | 50 min |
| Solution annealed (ISO 4955, 5 d 100 mm) | 650 – 850 | 510 min | 25 min | – | – |
| Sandvik / Alleima (seamless tube, solution annealed) | 540 – 740 | 230 min (Rp0.2) | 35 min | 90 max | – |
Heat treatment: Solution annealing at 1050-1150 C, holding 5-20 minutes depending on section thickness, followed by rapid cooling in water, air, or protective gas. Stress relieving at 850-950 C for 10-15 minutes in air. FUSHUN METAL verifies tensile, hardness, and Charpy impact values on every heat-treatment batch from both the VIM+VAR+PESR ingot top and bottom, and supplies data by section and heat number, all traceable under our ISO 9001 / AS9120B certified laboratory.
Elevated-temperature yield strength (typical, solution annealed): Rp0.2 213 MPa at 50 C, 171 MPa at 150 C, 148 MPa at 300 C, 139 MPa at 500 C, 136 MPa at 550 C, 130 MPa at 650 C, and 125 MPa at 700 C. Creep rupture strength at 600 C: 241 MPa for 10,000 h and 199 MPa for 100,000 h. Density: 7.9-8.0 g/cm . Modulus of elasticity: 207 GPa at 20 C. Thermal conductivity: 12.5 W/m-K at 20 C.
Frequently Asked Questions About X10CrNiMoMnNbVB15-10-1
Q: What is the maximum service temperature of 1.4982 / S21500?
In boiler superheater and reheater applications, X10CrNiMoMnNbVB15-10-1 operates reliably at metal temperatures of 600-700 C (flue gas up to 1200 C). For continuous structural use, the grade is rated to approximately 650 C. Scaling resistance in air is maintained up to 800 C.
Q: How does FUSHUN METAL ensure quality in its 1.4982 production?
FUSHUN METAL employs a triple-melt route (VIM + VAR + PESR) to eliminate macro-inclusions and minimize gas content (O, H, N). Every heat undergoes spectrometer verification, ultrasonic testing, eddy-current inspection, and mechanical testing under our ISO 9001 and AS9120B certified quality system.
Q: Is X10CrNiMoMnNbVB15-10-1 weldable?
Yes, the grade exhibits good weldability. Welding is performed without preheating, and post-weld heat treatment is normally not required. Recommended heat input is below 1.5 kJ/mm with interpass temperature under 150 C. Suitable filler metals include ISO 18274 S Ni 6082 / AWS A5.14 ERNiCr-3 for TIG/GTAW and ISO 14172 E Ni 6182 / AWS A5.11 ENiCrFe-3 for MMA/SMAW processes.
Q: What differentiates X10CrNiMoMnNbVB15-10-1 from standard 316H or 347H stainless steels?
While 316H and 347H are also austenitic grades used at elevated temperatures, 1.4982 / S21500 delivers substantially higher creep strength thanks to its controlled boron, niobium, and vanadium micro-alloying. Its fireside corrosion resistance in coal-fired and biomass boilers is comparable to 347H, but the significantly higher hot strength means thinner sections and longer service life.
Q: Can FUSHUN METAL supply 1.4982 with EN 10204 3.2 certification?
Absolutely. FUSHUN METAL routinely provides EN 10204 3.1 and 3.2 certificates for all X10CrNiMoMnNbVB15-10-1 shipments. Our in-house laboratory (ISO 9001 / AS9120B accredited) performs full chemical, tensile, impact, hardness, and ultrasonic inspection. Third-party witness testing by Lloyd’s Register, Bureau Veritas, TUV, or customer-nominated inspectors can be arranged at short notice.
