TECHNICAL SPECIFICATION - TOCT 4543 Grade 25X2H4MA
TECHNICAL SPECIFICATION: TOCT 4543 - 1971
OFFICIAL TEST CERTIFICATE: issued by TUV - SGS - BV
MATERIAL CATEGORY: alloy structural steel Cr - Ni - Mo type
CHEMICAL COMPOSITION (WEIGHT %)
C (%): 0.21 ~ 0.28
Si (%): 0.17 ~ 0.37
Mn (%): 0.25 ~ 0.55
P (%) ≤: 0.025
S (%) ≤: 0.025
Cr (%): 1.35 ~ 1.65
Ni (%): 4.00 ~ 4.40
Mo (%): 0.30 ~ 0.40
Cu (%): ≤ 0.30
MECHANICAL PROPERTIES UNDER ROOM TEMPERATURE
Hot working temperarture: 1150 ~ 850 Deg.
Heat treatment: Quenching 850 Deg. air cooling
Tempering 560 oil cooling
Tensile strength,σb/≥ MPa: 1079
Yield strength, σ0.2/≥ MPa: 932
Elongation, δ ≥(%): 11.0
Reduction of area, ф ≥ (%): 45.0
Impact, AK (J/cm2): 88
Annealed hardness | HBW: 269
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 rods
Mechanical parts - connecting rods, bolts and nuts
Multidiameter shafts
OFFERING FORMS AND SHAPES
Round bar (Diameter): 0.50mm to 500mm
Square bar / Flat bar: 3mm to 500mm
Steel strip: T0.20 ~ 3mm X W10 ~ 2000mm X Coil
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
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