X11CrMo9-1, X12CrMo9-1, 1.7386 - high-alloy boiler steel for operation at elevated temperatures according to EN 10216-2, A213/A335.
| Standard | Steel Grade | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition | ||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | Al: | Cu: | |
| EN | X11CrMo9-1 - 1.7386 | |||||||||
| 0.08 - 0.15 | 0.3 - 0.6 | 0.25 - 1.00 | <0.025 | <0.010 | 8.0 - 10.0 | - | 0.9 - 1.1 | <0.4 | <0.3 | |
| DIN | X12CrMo9-1 - 1.7386 | |||||||||
| 0.07 - 0.15 | 0.3 - 0.6 | 0.25 - 1.00 | <0.025 | <0.020 | 8.0 - 10.0 | - | 0.9 - 1.1 | - | - | |
| GOST | 13Ch9M - 13Х9М | |||||||||
| 0.09 - 0.15 | <0.5 | <0.5 | <0.035 | <0.025 | 7.5 - 9.5 | <0.5 | 0.9 - 1.1 | - | <0.25 | |
| ASTM | UNS K90941 - A213 T9 - A335 P9 - A387 Grade 9 | |||||||||
| <0.15 | 0.3 - 0.6 | 0.25 - 1.00 | <0.030 | <0.030 | 8.0 - 10.0 | - | 0.9 - 1.1 | - | - | |
| JIS | STBA26 - STFA26 - STPA26 | |||||||||
| <0.15 | 0.3 - 0.6 | 0.25 - 1.00 | <0.030 | <0.030 | 8.0 - 10.0 | - | 0.9 - 1.1 | - | - | |
X11CrMo9, 1.7386 - specification and application
High alloy boiler steel for operation at elevated temperatures supplied in the form of pipes, flanges, bars and forgings with a chromium content of 9% and 1% of Molybdenum. The material shows a martensitic structure after tempering and ferritic structure in the annealed state, it is characterized by high resistance to creep/oxidation and cracks and low thermal expansion. Steel designed for operation at temperatures of 550-650C for power and petrochemical industry for pipelines, secondary and outlet steam superheaters, steam and outlet collectors, turbine parts, flanges, connectors, and heat exchangers. Grade close to 1.4903 / F91 / P91 without added Niobium and Vanadium.
Mechanical properties of X11CrMo9, 1.7386 pipes according to EN 10216-2
- Delivery condition +I:
- Tensile strength, Rm 460 - 640 MPa
- Yield strength, Rp0,2: >210 MPa
- Longitudinal tests - Elongation, A: >20%
- Longitudinal tests - Impact strength, KV: >40J
- Lateral tests - Elongation, A: >18%
- Lateral tests - Impact strength, KV: >27J
- Delivery condition +NT:
- Tensile strength, Rm 590 - 740 MPa
- Yield strength, Rp0,2: >390 MPa
- Longitudinal tests - Elongation, A: >18%
- Longitudinal tests - Impact strength, KV: >40J
- Lateral tests - Elongation, A: >16%
- Lateral tests - Impact strength, KV: >27J
Mechanical properties of UNS K90941, grade 9
- ASTM A335 Grade P9 / A213 Grade T9
- Tensile strength, Rm >415 MPa
- Yield strength, Rp0,2: >205 MPa
- Longitudinal tests - Elongation, A: >30%
- Lateral tests - Elongation, A: >20%
- Hardness HV: <190
- Hardness HRB: <89
- Hardness HBW: <179
- ASTM A336 Grade F9:
- Tensile strength, Rm 585 - 760 MPa
- Yield strength, Rp0,2: >380 MPa
- Elongation, A: >20%
- Necking, Z: >40%
- ASTM A182 Grade F9
- Tensile strength, Rm >585 MPa
- Yield strength, Rp0,2: >380 MPa
- Elongation, A: >20%
- Necking, Z: >40%
- Hardness: 179 - 217HB
Mechanical properties of X11CrMo9-1 at elevated temperatures
| Yield strength, Rp0.2 (MPa) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Temp. in C | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 |
| X11CrMo9+I | >187 | >186 | >178 | >177 | >175 | >171 | >164 | >153 | >142 | >120 |
| X11CrMo9+NT | >363 | >348 | >334 | >330 | >326 | >322 | >316 | >311 | >290 | >235 |
Heat treatment - processes and temperatures:
- Softening annealing at the temperature of 950-980C
- Nitriding at the temperature of 890-950C
- Tempering at temperature 720-800C
In the above mentioned grades the company offers:
- Seamless boiler tubes X11CrMo9-1, 1.7386
- Hot-rolled bars X11CrMo9-1, 1.7386
- Forgings and forged bars X11CrMo9-1, 1.7386
Other substitutes and grade equivalents:
X12CrMo9-1, 1.7386, X11CrMo9-1+I, X11CrMo9-1+NT, X11CrMo9-1TA, X11CrMo9-1TN, X11CrMo9-1TN+TT, X11CrMo9, BS629-470, BS629-590, CromElso 9, 13Ch9M, 13Х9М, UNS K90941, A213 grade T9, A335 grade P9, EN 10253-2, A387 Grade 9, STBA26, STFA26, STPA26, HT7R, A182 F9, A200 T9, A387 Grade 9, A369 Grade FP9, A182 grade F9, 9Cr-1Mo.