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ASTM 29–4C

Item No.: ASTM,A240,A268,A269,A270,A276,A565,A582,
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Description Technical Data Sheet
The alloy is usually produced by BEF & AOD followed by electroslag remelting (ESR) / VAR if necessary for special purpose.
Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different levels according to the buyers' requirements.
100% Ultrasonic test ASTM E2375 /SAE AMS 2154 /SEP 1923 /GB/T 4162 /EN 10228-3.
Bars are usually supplied black/bright in the annealed condition.
Forms and Shapes:
Round bar (Diameter): 5.50 ~ 650mm
Square bar / Flat bar: 3 ~ 650mm
Wire rod (Diameter): 0.10 ~ 16mm
Steel strip via cold rolled: T0.1 - 3mm X W5 - 650mm X L (or in coil form)
Forging piece: Different shapes based on OEM
Chemical Composition (Weight %)
C (%) ≤ 0.03
Si(%) ≤ 1.00
Mn(%) ≤ 1.00
P(%) ≤ 0.040
S (%) ≤ 0.030
Cr (%) 28.0 ~ 30.0
Ni (%) ≤ 1.00
Mo(%) 3.60 ~ 4.20
Other (%) (Ti+Nb)0.20 ~ 1.00 ≥ 6×(C+N)
N ≤ 0.045
Mechanical Properties
Condition of heat treatment -
Tensile Rm (MPa) 550
Yield Rp0.2 (MPa) 415
Elongation A (%) 18
Reduction in cross section on fracture Z (%) -
Impact AKV/AKU (J) -
Brinell Hardness (HBW) 255

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