2015-07-07 09:25:52 Origin： Remark：0 Click：
TECHNICAL DATASHEET- Grade BS S99
H S CODE For Customs - 7228 4000 / 7228 5000 / 7228 6000
CHEMICAL COMPOSITION (mass weight %)
Silicon, Si (％): 0.10 ~ 0.35
Manganese, Mn (％): 0.45 ~ 0.70
Phosphorus, P (％)≤: 0.035
Sulfur, S (％)≤: 0.030
Chromium, Cr (％): 0.50 ~ 0.80
Molybdenmum, Mo (％): 0.45 ~ 0.65
Yield strength σs≥/MPa: 875
Elongation δ5≥(%): 7.0
Hardness HBS: HB 285 max. under annealed condition
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.
Extensive database of long term, high temperature test results.
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.
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
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.
Round bar / Wire rod (Diameter): 5.5 to 500mm
Square bar / Flat bar: 10 to 800mm
Length: Fixed length or random length or based on the customer's special requirement.
Forging piece: stepped shafts, other different shapes based on OEM.
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