MATERIAL DATA SHEET - DIN 24CrMo5
MATERIAL CATEGORY - High temperature structural steel
Alloy structural steel is provided with higher yield strength, tensile strength, endurance strength, yield ratio (about 0.85 generally ) enough plasticity and toughness.
The concentration of alloy element of this kind of steel is quite high, mainly are corrosion resistant steel, heat resistant steel, wear resistant steel, and other special steels of physical and chemical properties. Alloy structural steel has preferable mechanical property than that of carbon structural steel, high performance of heat treatment especially.
The alloy is usually produced by EAF /VD /LF followed by electroslag refining (ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the buyers' requirements.
Bars are usually supplied bright in the annealed condition.
Final heat treatment - heat treatment / QT
MATERIAL SPECIFICATIONS - DIN EN 10028-2 (2003), DIN 17755 (1983)
CHEMICAL COMPOSITION (mass weight - %)
Carbon, C (％): 0.20 ~ 0.28
Silicon, Si (％): ≤ 0.40
Manganese, Mn (％): 0.50 ~ 0.80
Phosphorus, P (％)≤: 0.035
Sulfur, S (％)≤: 0.035
Chromium, Cr (％): 0.90 ~ 1.20
Molybdenum, Mo (％): 0.20 ~ 0.35
Nickel, Ni (％): ≤ 0.60
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working temperature /℃: 1100～850
Heat treatment temperature /℃|annealing / normalizing : 650~740
Heat treatment temperature /℃|quenching: 900~950 oil or air
Heat treatment temperature /℃|tempering: 650~700
HBS: 175 ~ 220
Tensile strength, (≥)|σb/MPa: 590 ~ 740
Yield strength, (≥)|σs/MPa: 440
Elongation, (≥)|δ5(%): 18.0
Impact strength, (≥)|AKV/J: 55
MECHANICAL PROPERTY UNDER HIGH TEMPERATURE
Yield strength σ0.2≥/MPa|200℃: 412
Yield strength σ0.2≥/MPa|300℃: 363
Yield strength σ0.2≥/MPa|350℃: 333
Yield strength σ0.2≥/MPa|400℃: 304
Yield strength σ0.2≥/MPa|450℃: 275
Yield strength σ0.2≥/MPa|500℃: 235
PROFILE & DIMENSIONS
Round bar / Disc (diameter): 5.5mm to 550mm
Square bar / Flat bar: 10mm to 600mm
Plate / Sheet steel / Steel strip: 0.5mm to 400mm
Width: 8mm to 1000mm
Length: random length or based on the customer's special requirement.
Forged steel shape: stepped shafts, other different shapes based on OEM.
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Mechanical gears, gear shaft, main axis, valve rod.
Mechanical parts - connecting rod, bolt and nut, Multidiameter shaft.
Pressure vessel, seamless pipe.
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