2014-10-21 08:47:37 Origin： Remark：0 Click：
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 - %)
C (％): 0.17 ~ 0.25
Si (％): ≤ 0.40
Mn (％): 0.40 ~ 0.80
P (％)≤: 0.030
S (％)≤: 0.030
Cr (％): 1.20 ~ 1.50
Mo (％): 0.55 ~ 0.85
Ni (％): ≤ 0.60
V (%): 0.20 ~ 0.35
Other (％): Al ≤ 0.030
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working temperature /℃: 1100～850
Heat treatment temperature /℃|annealing / normalizing : 650~730
Heat treatment temperature /℃|quenching: 890~940 oil or air
Heat treatment temperature /℃|tempering: 680~720
Tensile strength, (≥)|σb/MPa: 700～850
Yield strength, (≥)|σs/MPa: 550
Elongation, (≥)|δ5(%): 20.0
Impact, (≥)|AKV/J: 69
MECHANICAL PROPERTIES UNDER HIGH TEMP.
Yield strength σ0.2≥/MPa|200℃: 500
Yield strength σ0.2≥/MPa|300℃: 460
Yield strength σ0.2≥/MPa|350℃: 441
Yield strength σ0.2≥/MPa|400℃: 412
Yield strength σ0.2≥/MPa|450℃: 372
Yield strength σ0.2≥/MPa|500℃: 334
Round bar / flat bar / hollow bar / steel strip / forgings
Bright - peeled + polishing, centerless grinding
Forged - ring, tube, pipe casing, discs, shaft
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.
Pressure vessel, seamless pipe.
PROFILE AND DIMENSIONS
Round bar / Wire rod (Diameter): 5.5mm to 500mm
Square bar / Flat bar: 3mm to 1000mm
Plate / Sheet steel / Steel strip: 0.1mm to 1500mm
Width: 8mm to 1500mm
Length: random length or based on the customer's special requirement.
Forged steel shape: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE
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