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DTD 551
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3.0%Cr - 1.0%Mo Nitriding steel DTD 551 Round bar, flat bar, plate Steelmaking, ESR melted, Hot forging, Hot rolling, Heat treatment, Straightening, 100% Ultrasonic test, Cold working,

MATERIAL TECHNICAL DATASHEET - Grade BS 551

MATERIAL CATEGORY: Aerospace Standard "DTD" series alloy structural steel

OFFICIAL TEST CERTIFICATE: issued by TUV - SGS - BV

TYPE OF STEEL: Cr - Mo Nitriding steel

CHEMICAL COMPOSITION (mass weight %)

Carbon, C (％):  0.30 ~ 0.50
Silicon, Si (％):  0.10 ~ 0.40
Manganese, Mn (％):  0.40 ~ 0.80
Phosphorus, P (％)≤:  0.025
Sulfur, S (％)≤:  0.015
Chromium, Cr (％):  2.50 ~ 3.50

Nickel, Ni (%): ≥ 0.40
Molybdenum, Mo (％): 0.70 ~ 1.20

Vanadium, V (%): 0.10 ~ 0.30

MECHANICAL PROPERTIES UNDER ROOM TEMP.

Tensile strength σb≥/MPa: 1320
Yield strength σs≥/MPa: 1080
Elongation δ5≥(%): 8.0

Impact strength, AKV≥/J: 25
Annealed hardness HBS: 269 max.

PRODUCT PROFILE
Round bar (Diameter): 5.5mm to 800mm
Square bar / Flat bar: 3mm to 800mm
Length: Fixed length or random length or based on the customer's special requirement.

Steel strip via cold rolled: T0.1 - 3mm X W5 - 200mm X L (or in coil form)
Forging piece: stepped shafts, 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, Email: sales@ccsteels.com

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