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1.4762, DIN X10CrAl24, AISI 446
Production specification
Square-shape steel standard Download
Plate steel standard Download
Billet standard Download
Flat bar standard Download
wire standard Download
tube standard Download
pipe standard Download
Forging standard Download
casting standard Download
sheet standard Download
round bar standard Download
coil standard Download
Bar stock standard Download
profiled bar standard Download
1.4762, DIN X10CrAl24, AISI 446
Designation by Standards
Brand Name | LH No. | Mat. No. | DIN | EN | AISI |
PK10 | 945 | 1.4762 | X10CrAl24 | - | 446 |
Chemical Composition (in weight %)
C | Si | Mn | Cr | Mo | Ni | V | W | Others |
max. 0.12 | 1.05 | max. 1.00 | 24.50 | - | - | - | - | Al=1.45 |
Description
Heat resisting ferritic steel. Heat resistance in air up to 1150oC.
Applications
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]: 220, 208 (200oC), 192 (400oC), 172 (600oC)
Density [g/cm3]: 7.7
Thermal conductivity [W/m.K]: 17.0, 23.0 (500oC)
Electric resistivity [Ohm mm2/m]: 1.1
Specific heat capacity[J/g.K]: 0.45
Mechanical properties at ambient temperature
Hardness: max. 223 HB
0.2 % proof stress: min. 280 N/mm2
Tensile strength: 520-720 N/mm2
Elongation: 10% (Longt.), 7% (Transv.)
Resistance to:
Oxydizing: very high
Reducing: high
Nitrogenous and low-oxygen gasses: low
Carburization: medium
Maximum operating temperature in air: 1150oC.
Coefficient of Linear Thermal Expansion 10-6 oC-1
20-200oC | 20-400oC | 20-600oC | 20-800oC | 20-1000oC |
10.5 | 11.5 | 12.0 | 12.5 | 13.5 |
Soft Annealing or Quenching
Heat to 780-850oC, then quenching in air or water. Structure of heat treated steel is ferrite.
Hardening
This alloy does not respond to heat treatment.
1% Creep Limit in N/mm2 vs. Temperature in oC
Hours | 500oC | 600oC | 700oC | 800oC | 900oC |
1 000 | 80 | 27.5 | 8.5 | 3.7 | 1.8 |
10 000 | 50 | 17.5 | 4.7 | 2.1 | 1.0 |
Creep Rupture Strength in N/mm2 vs. Temperature in oC
Hours | 500oC | 600oC | 700oC | 800oC | 900oC |
1 000 | 160 | 55 | 17.0 | 7.5 | 3.6 |
10 000 | 100 | 35 | 9.5 | 4.3 | 1.9 |
100 000 | 55 | 20 | 5.0 | 2.3 | 1.0 |
Forging
Hot forming temperature: 1100-750oC.
Machinability
Slow speeds and positive feeds combined with rigid mounts and sharp tooling surfaces optimize machining 446.
Welding
Most common welding methods can be successfully employed with this alloy. Type 308 welding material may be used, but will not display scaling resistance equal to the base metal. Consideration must be given to the differences in coefficient of thermal expansion of base and weld metal. Oxyacetylene welding is not recommended.
Cold working
Due to its elevated chromium content, 446 is more difficult than other stainless steels to bend, draw, spin and weld.
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