Carburizing steel and steel products manufactured making use of the carburizing steel

A method for the manufacture of a part of a constant velocity universal joint for a drive shaft comprising the steps of:

• subjecting said part to a carburizing treatment at a temperature between 880.degree. and 930.degree. C. for 1-3 hours, and
• quenching the carburized part from a temperature between 800.degree. and 870.degree. C.;
• said part being made of a carburizing steel consisting essentially of, in weight %, 0.1 to 0.25% C, 0.2 to 0.4% Si, 0.3 to 0.9% Mn, up to 0.02% P, 0.001 to 0.15% S, 0.5 to 0.9% Cr, 0.15 to 1% Mo, 0.01 to 0.1% Al, 0.0005 to 0.009% B, less than 0.006% N, and the balance Fe and incidental impurities.

A method for the manufacture of a part of a constant velocity universal joint for a drive shaft comprising the steps of:

• subjecting said part to a carburizing treatment at a temperature between 880.degree. and 930.degree. C. for 1-3 hours, and
• quenching the carburized part from a temperature between 800.degree. and 870.degree. C.;
• said part being made of a carburizing steel consisting essentially of, in weight %, 0.1 to 0.25% C, 0.2 to 0.4% Si, 0.3 to 0.9% Mn, up to 0.02% P, 0.001 to 0.15% S, 0.5 to 0.9% Cr, 0.3 to 4.0% Ni, 0.15 to 1% Mo, 0.01 to 0.1% Al, 0.0005 to 0.009% B, less than 0.006% N, and the balance Fe and incidental impurities.

A method for the manufacture of a part of a constant velocity universal joint for a drive shaft comprising the steps of:

• subjecting said part to a carburizing treatment at a temperature between 880.degree. and 930.degree. C. for 1-3 hours, and
• quenching the carburized part from a temperature between 800.degree. and 870.degree. C.;
• said part being made of a carburizing steel consisting essentially of, in weight %, 0.1 to 0.25% C, 0.2 to 0.4% Si, 0.3 to 0.9% Mn, up to 0.02% P, 0.001 to 0.15% S, 0.5 to 0.9% Cr, 0.15 to 1% Mo, 0.01 to 0.1% Al, 0.0005 to 0.009% B, less than 0.006% N, 0.01 to 0.3% for each of one or more elements selected from the group consisting of Ti, Nb, V and Zr, and the balance Fe and incidental impurities.

A method for the manufacture of a part of a constant velocity universal joint for a drive shaft comprising the steps of:

• subjecting said part to a carburizing treatment at a temperature between 880.degree. and 930.degree. C. for 1-3 hours, and
• quenching the carburized part from a temperature between 800.degree. and 870.degree. C.;
• said part being made of a carburizing steel consisting essentially of, in weight %, 0.1 to 0.25% C, 0.2 to 0.4% Si, 0.3 to 0.9% Mn, up to 0.02% P, 0.001 to 0.15% S, 0.5 to 0.9% Cr, 0.3 to 4.0% Ni, 0.15 to 1% Mo, 0.01 to 0.1% Al, 0.0005 to 0.009% B, less than 0.006% N, 0.01 to 0.3% for each of one or more elements selected from the group consisting of Ti, Nb, V and Zr, and the balance Fe and incidental impurities.