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Material Technical Standard of BS 4659 - 1989 High Speed tool steel BT20 data sheet,Grade BT20 Chemical compositions, BT20 Mechanical 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 BT20

MATERIAL CATEGORY: Tungsten series High speed tool steel
MATERIAL SPECIFICATIONS: BS 4659-1989
CHEMICAL COMPOSITIONS (WEIGHT - %)
C (%):     0.75 ~ 0.85
Si (%):     ≤ 0.40
Mn (%):   ≤ 0.40
P (%)≤:   0.030

S (%)≤:   0.030
Cr (%):    4.25 ~ 5.00
Mo (%):   ≤ 1.00
W (%):    21.0 ~ 22.5
V (%):     1.40 ~ 1.60
Co (%):   ≤ 0.60 
HEAT TREATMENT PRACTICE AND HARDNESS
Annealing temperature /℃: 870 ~ 890
Annealed hardness, ≤ HB: 255
Quenching temperature /℃: 1270 ~ 1290
Cooling medium: Oil or Air
Tempering temperature /℃: 550 ~ 570
Hardness under tempered condition HV: 823 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): 0.30 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.
Other different shapes based on OEM.

TECHNICAL SALES ASSISTANCE & SERVICE
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