Low-alloy boiler steel 7CrMoVTiB10-10, 1.7378, 7CrWVMoNb9-6, 1.8201, T24/P24, T23/P23 for power industry according to ASTM/ASME A 182/SA 182, A 335/SA 335, EN 10216-2.

 

Standard Steel Grade
Chemical Composition (%)
C: Mn: Si: P: S: Cr: Mo: V: Ti: Al: N: W: B:
EN 7CrMoVTiB10-10 - 1.7378
0.05 - 0.10 0.3 - 0.7 0.15 - 0.45 <0.02 <0.01 2.2 - 2.6 0.9 - 1.1 0.2 - 0.3 0.05 - 0.10 <0.02 <0.01 - 0.0015 - 0.0070
EN 7CrWVMoNb9-6 - 1.8201
0.04 - 0.10 0.1 - 0.6 <0.5 <0.03 <0.01 1.9 - 2.6 0.05 - 0.30 0.2 - 0.3 0.005 - 0.06 <0.03 <0.015 1.45 - 1.75 0.001 - 0.006
ASTM
ASME
A/SA 335 Grade P24 - A/SA 213 Grade T24
0.05 - 0.10 0.3 - 0.7 0.15 - 0.45 <0.02 <0.01 2.2 - 2.6 0.9 - 1.1 0.2 - 0.3 0.06 - 0.10 <0.02 <0.012 - 0.0015 - 0.0070
ASTM
ASME
A/SA 335 Grade P23 - A/SA 213 Grade T23
0.04 - 0.10 0.1 - 0.6 <0.5 <0.03 <0.01 1.9 - 2.6 0.05 - 0.30 0.2 - 0.3 0.005 - 0.06 <0.03 <0.015 1.45 - 1.75 0.001 - 0.006

7CrMoVTiB10-10, 1.7378 - specification and application

The special, high-temperature creep resisting low-alloyed boiler steel is supplied mainly in the form of seamless tubing with ferritic or bainitic-martensitic structure designed for conventional power industry for construction of boiler components and constructions that operate in supercritical conditions to a temperature of approximately 575 ℃.

7CrMoVTiB10-10 is a much more efficient alternative to the standard 10CrMo9-10 and 14MoV6-3 materials due to improved strength characteristics at elevated temperatures (creep resistance) and pressures, as well as oxidation resistance.

The structure of the material depends on the specific casting, and after the welding process the steel should be annealed at the weld joints.

 


The mechanical properties of 7CrMoVTiB10-10, 1.7378 at room temperature:

  • Tensile strength, Rm: >585 MPa
  • Yield point, Rp0.2: >450 MPa
  • Elongation, A: >17%

Mechanical properties at elevated temperatures

Properties Temperatures ℃
100 200 300 400 500 550
Yield point, Rp0.2 MPa 412 390 375 362 340 325
  Temperatures ℃
500 520 540 560 580 600
Creep resistance, Rz/100000 MPa 237 205 170 135 98 62

 


In the above mentioned grades the company provides:

 

Other grades' designations:

7CrMoVTiB10-10, 7 CrMoVTiB 10-10, 7 CrMoVTiB 10.10, 1.7378, A335 Grade P24 T24 P23 T23, SA335 Grade P24 T24 P23 T23, A 335 Grade P24 T24 P23 T23, SA 335 Grade P24 T24 P23 T23, 7CrWVMoNb9-6, 1.8201, 07Cr2MoW2VNbB, 7 CrWVMoNb 9-6.


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