Fe415 steel was a commonly used grade of reinforced steel in India. The term "Fe415" stands for "Grade 415" where "Fe" refers to Iron (chemical symbol) and "415" refers to the minimum yield strength in megapascals (MPa).
The allowable yield stress of Fe415 steel is typically considered to be 415 MPa (megapascals). This means that the steel can withstand a maximum stress of 415 MPa before it starts to deform plastically.
However, please note that steel standards and grades may vary between countries and may be updated over time. It's essential to check the latest national or international standards for accurate and up-to-date information on Fe415 steel or any other steel grade you may be interested in.