14NiCr14 (EN 1.5752) is a low Carbon Nickel - Chromium Base Carburizing structural steel. Available round bar, flat bar, plate, and forgings properties from steelmaking, ESR, hot forging / rolling, heat treat, cold machined.
TECHNICAL DATASHEET - Grade DIN 14NiCr14
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, High notch tolerance.
Thermal expansion coefficients compatible with low alloy steel turbine casing materials.
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 / BEF 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.
Final heat treatment - heat treatment / QT
MATERIAL SPECIFICATIONS - DIN EN 10084 (1998), DIN 17210 (1986)
CHEMICAL COMPOSITION ( Mass weight - %)
C (％): 0.14 ~ 0.20
Si (％): ≤ 0.40
Mn (％): 0.40 ~ 0.70
P (％)≤: 0.035
S (％)≤: 0.035
Cr (％): 0.60 ~ 1.00
Mo (％): -
Ni (％): 3.00 ~ 3.50
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working temperature /℃: 1150～850
Heat treatment temperature /℃|annealing: 610～650
Heat treatment temperature /℃|carburizing: 850～900
Heat treatment temperature /℃|quenching (Center): 830～860
Heat treatment temperature /℃|quenching (Surface): 780~800 Oil
Heat treatment temperature /℃|tempering: 170～200
Hardness after annealing HBS≤: 230
Size /mm: φ11
After surface hardening |σb/MPa: 1030~1320
After surface hardening |σs≥/MPa: 835
After surface hardening |δ5(％)≥: 9
After surface hardening |ψ(％)≥: 40
After surface hardening |AKV①/J: 55
|size /mm: φ30
Tensile strength, |σb/MPa: 930 ~ 1280
Yield strength, |σs≥/MPa: 785
Elongation, |δ5(％)≥: 10
Reduction of area, |ψ(％)≥: 45
Impact strength, |AKV/J: 55
|size /mm: φ63
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
PROFILE AND DIMENSIONS
Round bar / Wire rod (Diameter): 5.5mm to 550mm
Square bar / Flat bar: 10mm to 800mm
Length: Fixed length or random length or based on the customer's special requirement.
Heavy/middle plate via hot rolled: T60 - 400mm X W100 - 1200mm X L1000 - 5000mm
Forging piece: stepped shafts, other different shapes based on OEM.
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