50W | Paralloy Group

28/48/5 Cr/Ni/W 0.5% C

Heat Resisting Alloy

Application

Established Tungsten Strenthening Alloy For High Temperature

50W may be used in applications up to 1200ºC in conditions where the maximum resistance to carburisation and oxidation are required. For example, applications for this alloy include: Pyrolysis Hangers, Furnace Rollers, Radiant Tubes and Retorts, and Heat Treatment Furnace components such as Trays and Fixtures.50W is also used for Catalyst Tubes in high temperature Reformer Furnaces such as Hydrogen Furnaces in Direct Reduction Plants, which operate over 1000ºC.

50W is a weldable chromium-nickel heat-resisting steel containing 28% Cr and 48% Ni and further alloyed with a tungsten addition. The result is an alloy which displays an excellent combination of creep strength along with resistance to carburisation and oxidation at high temperatures up to 1200ºC. The alloy is readily welded by the standard metal arc (SMAW) welding processes using matching composition type electrodes.

Nominal Composition

6
C Carbon

0.35
25
Mn Maganese

0.5
14
Si Silicon

0.5
28
Ni Nickel

47
24
Cr Chromium

27
Plus
Additions

Physical Properties

Coefficient of Thermal Expansion (mm/mm°C)	Thermal Conductivity (W/m°C)	Density (kg/m3)	Specific Heat (J/KgK)
20 - 100°C - 15.3 x 10⁻⁶	100°C - 14.2	8.35 x 10	495
20 - 800°C - 17.3 x 10⁻⁶	800°C - 23.9
20 - 1000°C - 17.7 x 10⁻⁶	1000°C - 26.4
20 - 1100°C - 17.9 x 10⁻⁶	1100°C - 27.6

Mechanical Properties

Download specifications

UTS (N/mm²) 430
Proof Stress 0.2% (N/mm²) 235
Elongation (%) 7 (tube) 3 (static)
Temperature UTS (N/mm²) Proof Stress 0.2% (N/mm²) Elongation (%)
800°C 265 - 25
900°C 177 - 32
1000°C 108 - 38
1100°C 79 - 46
Temp (°C)
Avg Initial Stress for
100,000h Creep Rupture (MPa)
Initial Stress for a Creep Rate
of 0.0001% / h (MPa)
975 8.60 -
1050 6.90 12.1
1100 4.65 7.7
1150 2.75 4.2
1200 1.40 2.1