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 Cold drawn and annealed (+C+A)
Product Form Rounds
Sizes Diameter from 5 mm to 20 mm
Surface Quality Class Class 1,2,3,4
Annexure-A
S. No Product Designation/ Grade Chemical Composition Mechanical Properties (if any)
1 IS 9550 SUH11 (M) % C : 0.47-0.55
% Si : 1.00-2.00
% Mn: 0.60 Max
% S: 0.030 Max
% P: 0.030 Max
% Ni : 0.60 Max
% Cu: 0.30 Max
% Cr: 0.75-0.95 Tensile Strength - 400 Mpa Min.
Yield Strength – 300 Mpa Min.
% Elongation – 5% (Min)
Hardness - HRC: 22-36
2 IS 9550 21-4N % C : 0.48-0.58
% Si : 0.25 Max
% Mn: 8.00-10.00
% Ni : 3.25-4.50
% Cr: 20.00-22.00
% S: 0.030 Max
% P: 0.040 Max
% N: 0.35-0.50 Tensile Strength - 300 Mpa Min.
Yield Strength – 200 Mpa Min.
% Elongation – 5%
Hardness - HRC: 42 MAX.
3 IS 9550 SUH38 % C : 0.25-0.35
% Si : 1.00 Max
% Mn: 1.20 Max
% Ni : 10.00-12.00
% Cr: 19.00-21.00
% S: 0.030 Max
% P: 0.18-0.25
% Mo: 1.80-2.50
% B: 0.001-0.010 Tensile Strength - 300 Mpa Min.
Yield Strength – 200 Mpa Min.
% Elongation – 5%
Hardness - HRC: 26-42.
4 IS 9550 21-12N % C : 0.15-0.25
% Si : 1.00 Max
% Mn: 1.00-1.60
% Ni : 10.00-12.00
% Cr: 20.50-22.50
% S: 0.030 Max
% P: 0.040 Max
% N: 0.15-0.30 Tensile Strength - 300 Mpa Min.
Yield Strength – 200 Mpa Min.
% Elongation – 5%
Hardness - HRC: 26-42.
5 IS 9550 23-8N % C : 0.28-0.38
% Si : 0.50-1.00
% Mn: 1.50-3.50
% Ni : 7.00-9.00
% Cr: 22.00-24.00
% S: 0.030 Max
% P: 0.040 Max
% N: 0.25-0.40 Tensile Strength - 300 Mpa Min.
Yield Strength – 200 Mpa Min.
% Elongation – 5%
Hardness - HRC: 26-42.
6 IS 9550 SUH 35 % C : 0.48-0.58
% Si : 0.35 Max
% Mn: 8.00-10.00
% S: 0.030 Max
% P: 0.040 Max
% Cr: 20.00-22.00
% Ni : 3.25-4.50
% Cu: 0.30 Max
% N: 0.35-0.50 Tensile Strength - 400 Mpa Min.
Yield Strength – 300 Mpa Min.
% Elongation – 5% (Min)
Hardness - HRC: 30-47
7 IS 9550 K-M62F-MA % C : 0.015 Max
% Si : 0.20 Max
% Mn: 0.30 Max
% Cr: 13.00-14.00
% S: 0.010-0.030
% P: 0.040 Max
% Cu: 0.20 Max
% Ni: 0.30 Max
% Mo: 0.30-0.70
% Al: 0.70-1.10
% Ti: 0.10-0.30
% Pb: 0.10-0.30
% B: 0.0005-0.0050 Tensile Strength - 300 Mpa Min.
Yield Strength – 200 Mpa Min.
% Elongation – 12%
Hardness - HRB: 70-90.
8 IS 9550 SUH 3 % C : 0.35-0.45
% Si : 1.00-2.50
% Mn: 0.60 Max
% S: 0.030 Max
% P: 0.030 Max
% Cr: 10.00-12.00
% Ni : 0.60 Max
% Cu: 0.30 Max
% Mo: 0.70-1.30 Tensile Strength - 400 Mpa Min.
Yield Strength – 300 Mpa Min.
% Elongation – 5% (Min)
Hardness - HRC: 22-36
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