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Designation by Standards

Steel No. DIN EN AISI
1.4903 - X10CrMoVNb9-1 A213/P91


Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.10 0.35 0.45 9.00 1.00 - 0.20 - -


Description
1.4903 steel is creep-resistant material that is generally used for temperatures up to 630oC.

Applications
Boiler tube sector and for superheated steam fittings.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 218, 207(200oC), 190(400oC), 162(650oC)
Density [g/cm3]: 7.7
Thermal conductivity [W/m.K]: 29.2
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1

20-200oC 20-400oC 20-650oC
11.3 12.0 12.7


Annealing
Heat to 730-780oC, cool slowly in furnace or air. Structure is martensite.

Hardening
Harden from a temperature of 1040-1090oC followed by air or oil quenching.

Mechanical properties at ambient temperature
Condition: Normalised and annealed, for size <"130 mm
0.2 % proof stress: 450 N/mm2
Tensile strength: 630-730 N/mm2
Elongation: 19% (Longit.), 17% (Transv.)
Notch impact energy (ISO-V): 40J (Longit.), 27J (Transv.)

0.2 % proof stress in N/mm2 vs. Temperature in oC

100oC 150oC 200oC 250oC 300oC 350oC 400oC 450oC 500oC 550oC 600oC
410 395 380 370 360 350 340 320 300 270 215


Approximate values for creep rupture strength

Mean Creep Rupture Strength in N/mm2 vs. Temperature in oC

Hours 500oC 520oC 540oC 560oC 580oC 600oC 620oC 640oC 660oC
10 000 289 252 216 182 151 123 99 79 62
100 000 258 220 183 150 120 94 73 56 42
200 000 246 208 171 139 110 86 65 49 35


Forging
Hot forming temperature: 1100-800oC, cool slowly. Note: Quenching and tempering treatment must always be carried out after hot forming.

Machinability
Metal-cutting machinning is the sae as for speial engineering steel gardes of corresponding strength.

Welding
The material displays good weldability. Welding must be followed by stress relief annealing with slow cooling. Filler material is MTS 3 or Thermanit from Thyssen.

Remark
All technical information is for reference only.