S99 datasheet,S99 chemical,S99 heat treatment

S99
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Description S99 Plate, Inventory S99D Round bars, Stocklist S99G Shaft Forgings, Steelmaking, Electroslag melting, Blooming, Ultrasonic test, hot forging, Rolling, Heat treatment, Straightened, Ultrasonic test, Cold working, Machined. We also possess advanced precision machining equipments for further processing. Please contact with us for detailed enquiry by today!
OFFICIAL TEST CERTIFICATE: issued by TUV - SGS BV

TECHNICAL DATASHEET- Grade BS S99
MATERIAL CATEGORY - Aircraft "S" series alloy structural steel
TYPE OF STEEL - Middle-carbon 2.5% Ni-Cr-Mo steel
MELTING PROCESS - EAF +LF + VD / BEF + ESR
H S CODE For Customs - 7228 4000 / 7228 5000 / 7228 6000

CHEMICAL COMPOSITION (Mass weight - %)    
C (%):    0.36 ~ 0.44
Si (%):    0.10 ~ 0.35
Mn (%):  0.45 ~ 0.70
P (%)≤:  0.035
S (%)≤:  0.030
Cr (%):   0.50 ~ 0.80
Ni (%):   2.30 ~ 2.80
Mo (%):  0.45 ~ 0.65
TYPICAL MECHANICAL PROPERTIES
Condition: Heat treatment
Tensile strength σb≥/MPa: 1210~1470
Yield strength σs≥/MPa: 875
Elongation δ5≥(%): 7.0
Impact, AKV≥/J: 28
Hardness HBS: HB 285 max. under annealed condition
PRODUCT DESCRIPTION
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.
Proven performance in long-term service.
Extensive database of long term, high temperature test results.
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.
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 
    
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 rod
Mechanical parts - connecting rod, bolt and nut
Multidiameter shaft
Pressure vessel
PROFILE & DIMENSIONS AVAILABLE
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.
Heavy/middle plate via hot rolled: T20 - 450mm X W100 ~ 1000mm X L1000 ~ 4000mm
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry, pleased to EMAIL our resident team of qualified production engineers. E-mail: sales@ccsteels.com.

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