BT21
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BS 4659 - 1989 HSS BT21 datasheet, BT21 Chemical, BT21 Properties from Steelmaking, ESR melted, Hot blooming, Hot forging, Hot rolling, Heat treatment, Straightening, 100% Ultrasonic flaw test, Cold working, Peeled or rough turned machining. Technical specification - BS 4659-1989. 100% Ultrasonic test ASTM E2375 /SAE AMS 2154 /SEP 1923 /GB/T 4162 /EN 10228-3.
TECHNICAL DATA SHEET - BS BT21
CHEMICAL COMPOSITIONS (WEIGHT - %)
C (％): 0.60 ~ 0.70
C (％): 0.60 ~ 0.70
Si (％): ≤ 0.40
Mn (％): ≤ 0.40
P (％)≤: 0.030
S (％)≤: 0.030
P (％)≤: 0.030
S (％)≤: 0.030
Cr (%): 3.50 ~ 4.25
Mo (%): ≤ 0.70
W (%): 13.5 ~ 14.5
V (%): 0.40 ~ 0.60
Co (%): ≤ 1.00
HEAT TREATMENT PRACTICE AND HARDNESS
Annealing temperature /℃: 850 ~ 870
Annealed hardness, ≤ HB: 255
Quenching temperature /℃: 1270 ~ 1290
Cooling medium: Oil or Air
Tempering temperature /℃: 550 ~ 570
Hardness under tempered condition HV: 798 min.
Tempering temperature /℃: 550 ~ 570
Hardness under tempered condition HV: 798 min.
MELTING PROCESS
This alloy is generally smelt in Non-vacuum furnace + ESR, Electric Arc Furnace (EAF).
For a purpose of superior quality, it should be smelt via technology of Electroslag remelting or vacuum refining or by agreement.
PRODUCT PROFILE AND AVAILABLE FORMS
Round bar (Diameter): 5.5 to 450mm
Square bar / Flat bar: THK 3 to 500mm X Width 3 ~ 1200mm
This alloy is generally smelt in Non-vacuum furnace + ESR, Electric Arc Furnace (EAF).
For a purpose of superior quality, it should be smelt via technology of Electroslag remelting or vacuum refining or by agreement.
PRODUCT PROFILE AND AVAILABLE FORMS
Round bar (Diameter): 5.5 to 450mm
Square bar / Flat bar: THK 3 to 500mm X Width 3 ~ 1200mm
Wire rod (Diameter): 0.30 to 16mm
Steel strip: THK0.15 ~ 2.50 X W8.0 ~ 600mm
Length: Fixed length or random length or based on the customer's special requirement.
Steel strip: THK0.15 ~ 2.50 X W8.0 ~ 600mm
Length: Fixed length or random length or based on the customer's special requirement.
Other different shapes based on OEM.
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
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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