15CrMo SCM415 18CrMo4 1.7243 Alloy steel
TECHNICAL SPECIFICATION / DATASHEET - DIN 18CrMo4 & W-Nr 1.7243
MATERIAL CATEGORY: Carburizing structural steel
Proven performance in long-term service.
Extensive database of long term, high temperature test results.
High room and elevated temperature strength.Good creep.
High notch tolerance.
Thermal expansion coefficients compatible with low alloy steel turbine casing materials.
Lower design and operating risks
Simplified design for bolting configuration compared with martensitic steels or high nickel alloys.
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, or bright annealing specially.
Final heat treatment - heat treatment / QT
MATERIAL SPECIFICATIONS
DIN EN 10084 (1998), DIN 17210 (1986)
CHEMICAL COMPOSITION (WEIGHT %)
C(％): 0.15～0.21
Si(％): ≤0.40
Mn(％): 0.60～0.90
P(％)≤: 0.035
S(％)≤: 0.035
Cr(％): 0.90～1.20
Mo(％): 0.15～0.25
Ni(％): —
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working temperature /℃: 1050～850
Heat treatment temperature /℃|annealing: 680～700
Heat treatment temperature /℃|carburizing: 880～980
Heat treatment temperature /℃|quenching (Center): 860～900
Heat treatment temperature /℃|quenching (Surface): 780~820 Oil
Heat treatment temperature /℃|tempering: 150～200
Hardness after annealing HBS≤: 207
Size /mm: φ11
After surface hardening |σb/MPa: ≥1000
After surface hardening |σs≥/MPa: -
After surface hardening |δ5(％)≥: -
After surface hardening |ψ(％)≥: -
After surface hardening |AKV/J: -
Size /mm: φ30
After surface hardening |σb/MPa: ≥900
After surface hardening |σs≥/MPa: -
After surface hardening |δ5(％)≥: -
After surface hardening |ψ(％)≥: -
After surface hardening |AKV/J: -
Size /mm: φ63
After surface hardening |σb/MPa: ≥700
After surface hardening |σs≥/MPa: -
After surface hardening |δ5(％)≥: -
After surface hardening |ψ(％)≥: -
After surface hardening |AKV/J: -
AVAILABLE SHAPES
Black bar /Flat bar / Square bar /Pipe, /Steel strip, /sheet
Bright - peeled + polishing, centerless grinding
Forged - ring, tube, pipe casing, discs, shaft
TYPICAL APPLICATIONS
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.
Power generation – turbine fasteners – boiler support rods
Process plant – fasteners
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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