Steel sheet having excellent workability and shape accuracy and a method for its manufacture

A high strength cold rolled steel sheet comprising, in mass %, C:

• less than 0.02%, Si:
• at most 0.4%, Mn:
• 0.5-3.0%, P:
• at most 0.15%, S:
• at most 0.03%, Al:
• at most 0.50%, N:
• at most 0.01%, and Mo:
• 0.01-1.0%, wherein in a tensile test in a direction perpendicular to the rolling direction, the yield point is at most 300 MPa, the amount of work hardening and the amount of BH with a 2% prestrain are both at least 30 MPa, and a yield ratio is at most 75%.

A high strength cold rolled steel sheet comprising, in mass %, C:

• less than 0.02%, Si:
• at most0.4%, Mn:
• 0.5-3.0%, P:
• at most 0.15%, S:
• at most 0.03%, Al:
• at most 0.50%, N:
• at most 0.01%, Mo:
• 0.01-1.0%, and at least one of Cr:
• less than 1.5%, Ti:
• at most 0.15%, Nb:
• at most 0.15% and B:
• at most 0.01%, wherein in a tensile test in a direction perpendicular to the rolling direction, the yield point is at most 300 MPa, the amount of work hardening and the amount of BH with a 2% prestrain are both at least 30 MPa, and a yield ratio is at most 75%.

A steel comprising, in mass %, C:

• at most 0.04%, Si:
• at most 0.4%, Mn:
• 0.5-1.45%, P:
• at most 0.15%, S:
• at most 0.03%, Al:
• at most 0.50%, N:
• at most 0.01% and Mo:
• 0.01-1.0%, the steel having a structure which contains 0.5 to less than 10% by volume of retained austenite.

A high strength cold rolled steel sheet comprising, in mass %, C:

• at most 0.04%, Si:
• at most 0.4%, Mn:
• 0.5-3.0%, P:
• at most 0.15%, S:
• at most 0.03%, Al:
• at most 0.50%, N:
• at most 0.01%, and Mo. 0.01-1.0%, wherein in a tensile test in a direction perpendicular to the rolling direction, the yield point is at most 300 MPa, the amount of work hardening and the amount of BH with a 2% prestrain are both at least 30 MPa, and the yield ratio is at most 75%, and the steel has a structure which contains 0.5 to less than 10% by volume of retained austenite.