Hot-rolled steel for hyper tube and manufacturing method therefor

A method for manufacturing a hot-rolled steel sheet for a vacuum train tube, comprising:

• heating a slab to a heating temperature (T1) of 1100° C. to 1300° C., wherein the slab includes, by weight, carbon (C):
• 0.03 to 0.11%, silicon (Si):
• 1.0 to 2.0%, manganese (Mn):
• 1.2 to 2.2%, a balance of Fe, and inevitable impurities;
• hot-rolling the heated slab at a finish rolling temperature (T2) of 900° C. to 1000° C. to provide a hot-rolled steel sheet;
• and
• coiling the hot-rolled steel sheet at a coiling temperature (T3) of 600° C. to 700° C.,
• wherein the finish rolling temperature (T2) and the coiling temperature (T3) satisfy the following Relational expression 7:
• 10
• ≤
• -
• 101.9
• +
• 0.103
• *
• [
• T
• 2
• ]
• +
• 0.0339
• *
• [
• T
• 3
• ]
• -
• 61.9
• *
• [
• C
• ]
• -
• 190.2
• *
• [
• Nb
• ]
• ≤
• 20
• [
• Relational
• ⁢
• expression
• ⁢
• 7
• ]
• where [T2] and [T3] are the finish rolling temperature (T2, ° C.) and the coiling temperature (T3, ° C.), [C] and [Nb] are an amount of carbon (C) and an amount of niobium (Nb), included in the hot-rolled steel sheet (wt %), and, when a component thereamong is not included, brackets including the component are substituted with zero (0).