|Group||Hot Forged Steel Bars|
|Price||US $1700 / metric ton|
|Min. Order||1 metric ton|
|Terms of Payment||L/C, D/A, D/P, T/T|
|Steel grade||21CrMoV5-11 DIN 1.8070|
|Applications||Heavy Duty Shafts, Gears, Axles, Spindles, Couplin|
|Heat treatment||Normalized,Quenching and Tmenpering|
|Surface condition||Black or bright surface|
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
DIN EN 10028-2 (2003), DIN 17755 (1983)
CHEMICAL COMPOSITION (WEIGHT %)
C (％): 0.17 ～ 0.25
Si (％): 0.30 ～ 0.60
Mn(％): 0.30 ～ 0.60
P (％)≤: 0.035
S (％)≤: 0.035
Cr (％): 1.20 ～ 1.50
Mo (％): 1.00 ～ 1.20
Ni (％): ≤ 0.60
V (％): 0.25 ～ 0.35
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: 680~740
Tensile strength, (≥)|σb/MPa: 690～830
Yield strength, (≥)|σs/MPa: 540
Elongation, (≥)|δ5(%): 16.0
Impact, (≥)|AKV/J: 55
MECHANICAL PROPERTY UNDER HIGH TEMPERATURE
Yield strength σ0.2≥/MPa|200℃: 510
Yield strength σ0.2≥/MPa|300℃: 481
Yield strength σ0.2≥/MPa|350℃: 461
Yield strength σ0.2≥/MPa|400℃: 431
Yield strength σ0.2≥/MPa|450℃: 402
Yield strength σ0.2≥/MPa|500℃: 73
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
Round bar / Wire rod (Diameter): 0.50mm to 1000mm
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.