The 630MPa grade hot-rolled ribbed high-strength steel bars HRB630 and HRB630E delivered in the hot-rolled state and the 630MPa grade heat-treated ribbed high-strength steel bars HTRB630 and HTRB630E delivered according to the controlled rolling and controlled cooling process. The standard value of yield strength is 630N/mm2; the standard value of ultimate strength 790N/mm2; Seismic steel bars with "E" in the steel bar grade: Strength-yield ratio "Steel for reinforced concrete Part 2: Hot-rolled ribbed steel bars" GB/T1499.2 fost/foy≥1.25; Super strength ratio f0y/fyk≤ 1.30; The total elongation under maximum force Agt≥9%. The application range of 630MPa hot-rolled ribbed high-strength steel bars and heat-treated ribbed high-strength steel bars must be implemented in accordance with the provisions of this group standard; the technical requirements and inspection methods of steel bars refer to GB/T1499 .2
T/SCDA 042-2020 history
2024T/SCDA 042-2024 Technical standards for application of 630MPa ribbed high-strength steel bars