Designation by Standards
Chemical Composition (in weight %)
Heat resisting ferritic steel. Heat resistance in air up to 800oC.
Annealing and hardening shops: Boxes, pots, muffles, retorts, pans and tubs for all kinds of heat treatment. Heating rods and plates. Furnace and steam boiler construction: Grates and grate segments, fittings, conveyor parts, suporting and walking beams, rails, pistons, axle rollers, doors, slides, flaps, casings, recuperators, fans, superheater suspensions, pipe clamps, soot blower tubes. Glass, porcelain, enamelling, cement and ceramics industries: Burner nozzels, rings, segments and other parts for rotary and lepols kilns. General engineering: Grate bars, valves and spindles, stirring arms and teeth, thermocouple protecting tubes, fittings, drums, screws, nuts, rivets. Petroleum industry: Tubes and tubular parts.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 218, 206 (200oC), 190 (400oC), 170 (600oC)
Density [g/cm3]: 7.72
Thermal conductivity [W/m.K]: 23.0
Electric resistivity [Ohm mm2/m]: 0.69
Specific heat capacity[J/g.K]: 0.45
Coefficient of Linear Thermal Expansion 10-6 oC-1
Harden from a temperature of 750-800oC followed by air or water quenching. Structure is ferrite and pearlite.
Mechanical properties at ambient temperature
Hardness: 192 HB
0.2 % proof stress: 220 N/mm2
Tensile strength: 420-620 N/mm2
Elongation: 20 %
1% Creep Stress Limit t=1000 hours in N/mm2 vs. Temperature (oC)
Hot forming temperature: 1100-800oC.
All technical information is for reference only.