Brand Name :
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Type/Size/Grade/Variety :
Name of the product Bright Steel Bars
Product Designation As per Annex-A
Treatment Condition at Delivery Soft annealed and peeled/turned (+A+SH)
Product Form Rounds and Flats
Sizes Rounds:
Diameter from 16mm mm to 850 mm
Flats:
Thickness from 65mm to 400mm
Width from 130mm to 820mm
Surface Quality Class Class 1
Annexure-A
Unit: %
Steel group
Sub-category Grade Designation as per IS 9550 : 2024
Chemical components (Ladle analysis)
Mechanical Properties
C Si Mn P S Ni Cr Mo Cu V N Nb Ti Al Fe Al+Ti Hardness (max)
Alloy Steel
Medium Alloy IS 9550/QF5 Max 0.55 1.20 0.70 0.030 0.030 0.25 3.50 1.10 0.25 0.70 - - - - - - 229 HBW
min 0.45 0.80 0.30 - - - 2.50 0.70 - 0.30 - - - - - - -
Alloy Steel
High Alloy IS9550/QD61 Max 0.42 1.20 0.50 0.030 0.030 0.25 5.50 1.50 0.25 0.84 - - - - - - 229 HBW
min 0.32 0.80 - - - - 4.50 1.00 - 0.80 - - - - - - -
IS9550/QD61-R Max 0.42 1.20 0.50 0.030 0.030 0.25 5.50 1.50 0.25 0.84 - - - - - - 229 HBW
min 0.32 0.80 - - - - 4.50 1.00 - 0.80 - - - - - - -
IS9550/QDA61 Max 0.42 1.20 0.50 0.030 0.030 0.25 5.50 1.50 0.25 0.70 - - - - - - 229 HBW
min 0.32 0.80 - - - - 4.50 1.00 - 0.51 - - - - - - -
IS9550/QDH Max 0.44 0.50 0.50 0.025 0.010 0.28 4.70 2.80 0.25 0.60 - 0.10 - - - - 229 HBW
min 0.38 0.10 0.30 - - - 3.80 2.00 - 0.40 - 0.03 - - - - -
IS9550/QHZ Max 0.59 0.60 0.60 0.030 0.010 0.25 4.50 4.00 0.25 1.00 - 0.30 - - - - 255 HBW
min 0.53 - - - - - 4.00 3.00 - 0.90 - 0.10 - - - - -
IS9550/QCM8 Max 0.82 1.20 0.50 0.030 0.030 0.20 10.00 1.95 0.25 0.60 - - - - - - 255 HBW
min 0.78 0.70 0.30 - - - 8.10 1.85 - 0.50 - - - - - - -
IS9550/QC11 Max 1.60 0.40 0.60 0.030 0.030 0.50 13.00 1.20 0.25 0.50 - - - - - - 255 HBW
min 1.40 - - - - - 11.00 0.80 - 0.20 - - - - - - -
IS9550/UNS
N08800 Max 0.10 1.00 1.50 - 0.015 35.00 23.00 - 0.75 - - - 0.60 0.60 - - 108 HRB
min - - - - - 30.00 19.00 - - - - - 0.15 0.15 39.50 - -
IS9550/UNS
N08810 Max 0.10 1.00 1.50 - 0.015 35.00 23.00 - 0.75 - - - 0.60 0.60 - - 108 HRB
min 0.05 - - - - 30.00 19.00 - - - - - 0.15 0.15 39.50 - -
IS9550/UNS
N08811 Max 0.10 1.00 1.50 - 0.015 35.00 23.00 - 0.75 - - - 0.60 0.60 - 1.20 108 HRB
min 0.06 - - - - 30.00 19.00 - - - - - 0.15 0.15 39.50 0.85 -
IS9550/UNS
N08020 Max 0.07 1.00 2.00 0.045 0.035 38.00 21.00 3.00 4.00 - - 1.00 - - - - 108 HRB
min - - - - - 32.00 19.00 2.00 3.00 - - 8 X C% - - - - -
Stainless Steel
Duplex IS9550 / UNS
S32750 Max 0.030 0.80 1.20 0.035 0.020 8.00 26.00 5.00 0.50 - 0.32 - - - - - 310 HBW
min - - - - - 6.00 24.00 4.55 - - 0.24 - - - - - -
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