SAE 9840
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MATERIAL TECHNICAL DATASHEET - Grade SAE 9840
MATERIAL CATEGORY - SAE, AISI, UNS system alloy structural steel
MATERIAL SPECIFICATIONS - SAE J1249 -2000
OFFICIAL TEST CERTIFICATE - issued by TUV - SGS -  BV
CHEMICAL COMPOSITION ( mass weight % )
Carbon, C (％):  0.38 ~ 0.43
Silicon, Si (%):  0.20 ~ 0.35
Manganese, Mn (％):  0.70 ~ 0.90
Phosphorus, P (％)≤:  0.040
Sulfur, S (％)≤:  0.040
Chromium, Cr (%):  0.70 ~ 0.90
Nickel, Ni (%):  0.85 ~ 1.15
Molybdenum, Mo (%):  0.20 ~ 0.30
MECHANICAL PROPERTIES AND HOT WORKING
Bar size: Diam.30mm
Mechanical property ≥ σb/MPa: 1240
Mechanical property ≥ σs/MPa: 1105
Mechanical property ≥ δ5 (%): 15.0
Mechanical property ≥ ψ (％): -
Hardness / QT COND: HB 361
MAIN FEATURES AND MELTING PROCESS
The steels shall be manufactured by melting process EF, LF + EAF+ VD, IFF + ESR Melted. VIM + ESR can be handled by agreement. Forgings may be furnished in one of the following conditions: stress relieving; annealing; solution treatment; solution treatment and ageing; normalizing; normalizing and tempering; or quenching and tempering. Forgings may be furnished in one of the following conditions: stress relieving; annealing; solution treatment; solution treatment and ageing; normalizing; normalizing and tempering; or quenching and tempering.
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.
PROFILE AND DIMENSIONS
Round bar (Diameter): 5.5 to 500mm
Square bar / Flat bar: 10 to 650mm
Length: random length, fixed length or based on the customer's special requirement.
Steel strip: T0.20 ~ 3mm X W10 ~ 200mm X Coil
Heavy/middle plate via hot rolled: T40 - 400mm X W100 - 1000mm X L1000-12000mm
Forging piece: stepped shafts / other different shapes based on OEM requirement.
TECHNICAL SALES ASSISTANCE & SERVICE
If you meet further on any technical enquiry, pleased to EMAIL our resident team of qualified production engineers, Email: sales@ccsteels.com.