1.4923

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1.4923 Chemical composition

C:0.18~0.24%	Si:0.1~0.5%
Mn:0.4~0.9%	P≤0.025%
S≤0.015%	Ni:0.3%~0.8%
Cr:11.0~12.5%	Mo:0.8~1.2%

V:0.25~0.35%

Heat Treatment:
Quenching In Oil And Tempering.
 
Mechanical Properties:

Thickness	Proof Strength	Tensile Strength	Elongation After facture A%	Reduction in area Z%	Impact energy	Hardness
≤250	700 Mpa	900-1050Mpa	11/10/8	35/35/30	25/20/20	265~315
>250	700 Mpa	850-1050Mpa	11/10/8	35/35/30	25/20/20	265~315

12 Chrome Moly Van” steels are a series of martensitic stainless steels designed for use at moderately high temperatures. 1.4923 is a typical grade in this series. The dominant application is steam power generating plant.
Approximate Composition – 12% Cr, 0.5% Ni, 1.0% Mo, 0.30% V(vanadium), 0.20% C (approximate EN composition, no comparable ASTM grade).
This grade combines the following characteristics:

• Moderate strength – 800 MPa UTS, 600 MPa 0.2% PS at room temperature
• Moderate high temperature strength – 280 MPa 0.2% PS at 550°C
• Good creep strength – 137 MPa rupture stress at 550°C  at 100000 hours
• Moderate toughness – typically 50 J at room temperature
• Basic corrosion resistance
• Weldable with care. Requires pre and post weld heat treatment

The 12% CrMoV series of steels can be regarded as a development of the original Harry Brearley cutlery grade. By adding nickel, molybdenum and vanadium to the basic 12% Cr grade, the strength is improved especially at high temperature. The key property is creep strength. Creep is the phenomenon where a material continues to deform with time under stress. For steels it is important to take account of creep above about 450°C. Typical steam temperatures for power generation are approximately 550°C which explains the extensive use of these grades in this application sector. Further enhancements of the 12% CrMoV grades have been developed with additions of tungsten, cobalt, niobium and nitrogen. These have often been known by brand names such as FV 448, FV 535, Jethete M152.

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