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21CrMoV5 7

This document provides information on the steel alloy 21CrMoV5-7, including its composition, mechanical properties, applications, heat treatment requirements, and physical properties. The steel has good high temperature oxidation resistance and is used in steam and gas turbine applications. It maintains high strength at temperatures up to 550°C, with tensile strength of 600 MPa and yield strength of 550 MPa at that temperature. The alloy is hardened by heating to 980°C and oil quenching, followed by tempering.

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318 views2 pages

21CrMoV5 7

This document provides information on the steel alloy 21CrMoV5-7, including its composition, mechanical properties, applications, heat treatment requirements, and physical properties. The steel has good high temperature oxidation resistance and is used in steam and gas turbine applications. It maintains high strength at temperatures up to 550°C, with tensile strength of 600 MPa and yield strength of 550 MPa at that temperature. The alloy is hardened by heating to 980°C and oil quenching, followed by tempering.

Uploaded by

zamporps
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We take content rights seriously. If you suspect this is your content, claim it here.
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Steel

56TG
21CrMoV5-7

SPECIFICATION COMPOSITION
21CrMoV5-7 Carbon ..............................................0.25
Chromium ..........................................1.50
Molybdenum......................................0.60

MECHANICAL PROPERTIES Vanadium ..........................................0.20

Annealed condition: heat to 830 C followed by slow cooling.


- Brinell Hardness: 170
Oil quench from 980 C. Temper at 690 C. APPLICATIONS
Tensile test at ambient temperature:
- UTS: 900 N/mm2
Steam industry: fasteners for high temperature
- 0.2 % Yield strength: 800 N/mm2
environments, manifolds and turbine parts.
- Elongation (5d): 19 %
- Impact strength KCU: 150 J/cm2 Gas turbine industry: turbofan discs.
Tensile test at 500 C:
- UTS: 700 N/mm2
- 0.2 % Yield strength: 650 N/mm2 CHARACTERISTICS
- Elongation (5d): 17 %
- Impact strength KCU: 110 J/cm2
Good resistance to high temperature oxidation.
Tensile test at 525 C:
- UTS: 650 N/mm2
- 0.2 % Yield strength: 600 N/mm2
- Elongation (5d): 18 %
- Impact strength KCU: 110 J/cm2
Tensile test at 550 C:
- UTS: 600 N/mm2
- 0.2 % Yield strength: 550 N/mm2
- Elongation (5d): 18.5 %
- Impact strength KCU: 110 J/cm2
Creep:

Average load in N/mm2


Temperature Average load in N/mm2
causing 1 % elongation
in C causing creep fracture in
in 100,000 hrs

1000 hrs 10 000 hrs 100 000 hrs


180
500 350 290 220

525 330 220 150 110

550 270 180 120 80

3111c
HEAT TREATMENT
Harden:
- Heat to 980 C.
- Oil quench or air cool.

Temper:
- Depending on properties required.

PHYSICAL PROPERTIES
Density: 7.8

Mean coefficient of expansion in m/m.C:


- between 20 C and 200 C: 12.5 x 10-6
- between 20 C and 400 C: 13.5 x 10-6
- between 20 C and 600 C: 14.3 x 10-6
- between 20 C and 800 C: 14.7 x 10-6

Critical points:
- Ac 1: 770 C
- Ac 3: 890 C

FORGING
1150/950 C

AUBERT & DUVAL

22, rue Henri-Vuillemin 92230 Gennevilliers - France


Tel: 33 (0)1 55 02 58 00 Fax: 33 (0)1 55 03 58 01
Internet: http://www.aubertduval.fr e-mail: dircom@aubertduval.fr

The data provided in this document represent typical or average values rather than maximum or minimum guaranteed values. The applications indicated for the grades described are given as
guidance only in order to help the reader in his personal assessment. Please note that these do not constitute a guarantee whether implicit or explicit as to whether the grade selected is suited to
specific requirements. Aubert & Duvals liability shall not under any circumstances extend to product selection or to the consequences of that selection.

3111c 56TG

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