BUREAU OF INDIAN STANDARDS

Type/Size/Grade/Variety and Brand Name for CML No.       4100142968

Date : 10-08-2025


Brand Name :

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