High-alloy boiler steel X10CrMoVNb9-1, 1.4903, X10CrWMoVNb9-2, 1.4901, P91, P92 used in the power industry in the form of pipes, sheets, forgings and bars according to EN 10216-2, EN 10088-1, EN 10302.
| Standard | Steel Grade | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | V: | Nb: | Ti: | Al: | N: | W: | W: | B: | Cu: | |
| EN | X10CrMoVNb9-1 - 1.4903 - LW 1.4904 - 10CrMoVNb | ||||||||||||||||
| 0.08 - 0.12 | 0.3 - 0.6 | 0.2 - 0.5 | <0.02 | <0.005 | 8:0 - 9.5 | <0.4 | 0.85 - 1.05 | 0.18 - 0.25 | 0.06 - 0.10 | <0.01 | <0.02 | 0.03 - 0.07 | - | <0.01 | - | <0.3 | |
| EN | X10CrWMoVNb9-2 - 1.4901 | ||||||||||||||||
| 0.07 - 0.13 | 0.3 - 0.6 | <0.5 | <0.02 | <0.001 | 8.5 - 9.5 | <0.4 | 0.3 - 0.6 | 0.15 - 0.25 | 0.04 - 0.09 | <0.01 | <0.02 | 0.03 - 0.07 | 1.5 - 2.0 | <0.01 | 0.001 - 0.006 | - | |
| ASTM ASME UNS | A 182 Grade F911 - A 213 Grade T911 - SA 335 Grade P911 - K91061 | ||||||||||||||||
| 0.09 - 0.13 | 0.3 - 0.6 | 0.1 - 0.5 | <0.02 | <0.01 | 8.5 - 9.5 | <0.4 | 0.9 - 1.1 | 0.18 - 0.25 | 0.06 - 0.10 | <0.01 | <0.02 | 0.04 - 0.09 | 0.9 - 1.1 | <0.01 | 0.0003 - 0.0060 | - | |
| ASTM ASME UNS | A 335 Grade P91 - SA 355 Grade P91 - K91560 | ||||||||||||||||
| 0.08 - 0.12 | 0.3 - 0.6 | 0.2 - 0.5 | <0.02 | <0.001 | 8:0 - 9.5 | <0.4 | 0.85 - 1.05 | 0.18 - 0.25 | 0.06 - 0.10 | <0.01 | <0.02 | 0.03 - 0.07 | - | <0.01 | - | - | |
| ASTM ASME | A 387 Grade 91 - SA 387 Grade 91 | ||||||||||||||||
| 0.06 - 0.15 | 0.25 - 0.66 | 0.18 - 0.56 | <0.025 | <0.012 | 7.9 - 9.6 | <0.43 | 0.8 - 1.1 | 0.16 - 0.27 | 0.05 - 0.11 | <0.01 | <0.02 | 0.025 - 0.080 | - | <0.01 | - | - | |
| ASTM ASME UNS | A 335 Grade P92 - SA 182 F92 - A 182 Grade F92 - K92460 - A213 T92 | ||||||||||||||||
| 0.07 - 0.13 | 0.3 - 0.6 | <0.5 | <0.020 | <0.010 | 8.5 - 9.5 | <0.4 | 0.3 - 0.6 | 0.15 - 0.25 | 0.04 - 0.09 | <0.01 | <0.02 | 0.03 - 0.07 | 1.5 - 2.0 | <0.01 | 0.001 - 0.006 | - | |
| ASTM ASME UNS | K90901 - 9Cr1Mo - A 182 F91 - SA 182 Grade F91 - A 213 T91 - SA 213 grade T91 | ||||||||||||||||
| 0.07 - 0.14 | 0.3 - 0.6 | 0.2 - 0.5 | <0.020 | <0.010 | 8.0 - 9.5 | <0.4 | 0.85 - 1.05 | 0.18 - 0.25 | 0.06 - 0.10 | <0.01 | <0.02 | 0.03 - 0.07 | - | <0.01 | - | - | |
X10CrMoVNb9-1, 1.4903 - Boiler steel
X10CrMoVNb9-1 and equivalent P91 / T91, F91 are high-alloy species designed to work at elevated temperatures with a martensitic structure. The most common ones in the form of seamless pipes, bars, sheets or forged elements are used in the production of installations, pipelines, boilers and other components of power equipment operating at temperatures of 540-580C.
X10CrMoVNb9-1 steel is becoming more and more popular due to much better mechanical properties, resistance to creep, corrosion, impact resistance and thermal fatigue. In contrast to the well-known, proven boiler species, 1.4903 should be classified as high-alloyed heat-resistant boiler steel due to the increased content of Chromium, Molybdenum, and small amounts of Vanadium and Niobium.
It's price in relation to standard grades such as 14MoV6-3 is certainly higher, however, along with the price, the length of service life and higher material durability also increases.
1.4901 / X10CrWMoVNb9-2 / 92 is an improved version of the P91 / T91 / F91 material with a 2% addition of Tungsten, a slightly increased amount of Chromium, and a reduced content of Molybdenum, characterized by a creep resistance at temperatures of up to 600C higher by about 1/3. The material has even higher corrosion resistance and weldability. It is used at the highest operating temperatures up to 650C.
Grade 91/92 - Steel used for production of boiler components with supercritical and ultra-critical parameters - jackets, connectors for steam superheater outlet chambers, superheated steam superheaters, turbine shaft parts, chambers and pipelines for fresh and superheated steam, superheater coils, steam collectors, outlet collectors, fittings and sleeves for the installation of boilers, connectors, pipelines of modern power units operating at temperatures of approximately 550-640C and steam pressures of approx. 18-30 MPa.
General properties of X10CrMoVNb9-1, 1.4903:
- Tensile strength, Rm: 620 - 850 MPa
- The yield point, Re: > 450 MPa
- Elongation, A: >20%
- Modulus of elasticity E = 218 GPa
- Thermal conductivity, λ: 14 W * m-1 * K-1
- Linear expansion coefficient, α: 10,9 * 10-6 K-1
X10CrMoVNb9-1, 1.4903 - mechanical properties for pipes in the +NT condition
- Tensile strength, Rm: 630 - 830 MPa
- The yield point, Re: > 450 MPa
- Longitudinal samples
- Elongation, A: >19%
- Impact resistance, KV20℃: > 40J
- Transverse samples
- Elongation, A: >17%
- Impact resistance, KV20℃: > 27J
| Mechanical properties | Operating temperatures | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 100℃ | 150℃ | 200℃ | 250 - 205℃ | 300℃ | 350℃ | 400℃ | 450℃ | 500℃ | 550℃ | 600℃ | |
| The yield point, Rp0,2 (MPa) | >410 | >395 | >380 | >370 | >360 | >350 | >340 | >320 | >300 | >270 | >215 |
Mechanical properties for flat products X10CrMoVNb9-1, 1.4903
- In the +NT delivery condition
- Tensile strength, Rm: 550 - 760 MPa
- The yield point, Re: > 435 MPa
- Elongation, A: >18%
- Impact resistance, KV20℃: > 40J
- Impact resistance, KV0℃: > 34J
- Impact resistance, KV-20℃: > 27J
- In the +QT delivery condition
- Tensile strength, Rm: 520 - 700 MPa
- The yield point, Re: > 435 MPa
- Elongation, A: >18%
- Impact resistance, KV20℃: > 40J
- Impact resistance, KV0℃: > 34J
- Impact resistance, KV-20℃: > 27J
Mechanical properties for forgings X10CrMoVNb9-1, 1.4903
- Tensile strength, Rm: 630 - 730 MPa
- The yield point, Rp0,2: > 450 MPa
- Impact resistance and elongation - longitudinal samples
- KV0℃: > 40J
- A: > 19%
- Impact resistance and elongation - transverse samples
- KV0℃: > 27J
- A: > 17%
Heat treatment - process and temperature
- Normalizing at 1040 - 1100 ℃ with cooling in air or oil
- Tempering at a temperature of 730 - 780 ℃ with cooling in the air
In the above mentioned grades the company provides:
- Hot-rolled seamless and seamed tubes X10CrMoVNb9-1, 1.4903, grade P91, P92, T91
- Hot-rolled bars X10CrMoVNb9-1, 1.4903
- Forging and forged rings X10CrMoVNb9-1, 1.4903
- Sheets and flat bars X10CrMoVNb9-1, 1.4903
Other replacements and equivalents of the grade X10CrMoVNb9-1:
1.4903, A 1017 Grade 911, SA 1017 Grade 911, A 234 Grade WP91, SA 234 Grade WP91, A 336 Grade F91, SA 336 Grade F91, A 336 Grade F911, SA 336 Grade F911, A 336 Grade FP91, SA 369 Grade FP91, A 387 Grade 91, SA 387 Grade 91, UNS K91560, 9Cr1Mo, UNS K90901, A1012 T91, A182 F91, A200 T91, A213 T91, A831 T91, SA199 T91, SA213 T91, A1012 T911, A182 F911, A213 T911, A335 Grade P911, SA182 F911, SA213 T911, SA335 Grade P911, UNS K91560, 9Cr-1Mo-V-Cb-N, A335 Grade P91, A691 Grade 91, SA335 Grade P91, SA691 Grade 91, 10CrMoVNb, 10Cr9Mo1VNbN, S31108, 10Ch9MFB, 10Kh9MFB, 10Х9МФБ, 1.4901, X10CrWMoVNb9-2, A1012 T92, A182 F92, K92460, SA182 F92, SA213 T92, SA335 Grade P92, Stal P91, Stal P92, Grade P91, Grade P92.