Steel 09ГСФА (09GSF)

Fe is the basis.
According to TU 1383-010-48124013-03, to ensure fine-grainedness and nitrogen binding to nitrides and carbonitrides, the introduction of titanium and niobium is allowed not more than 0.030% and 0.040%, respectively. The alloying of steel with chromium and molybdenum in an amount not exceeding 0.40% and 0.30%, respectively, is allowed. For globularization of nonmetallic inclusions, steel is deoxidized by silicocalcium or cerium. The total content of Nb + V + Ni ≤ 0.15%.
According to TU 39-0147016-123-2000, titanium can be introduced up to 0.030%.
According to TU 1381-116-00186654-2013 the chemical composition is given for steel grade 09GSF. The mass fraction of calcium in the steel should not be more than 0.0050% (50ppm). For globularization of inclusions, steel is treated with calcium-containing materials. The alloying of REM steel is allowed. The ratio of Ca / S is not less than 1, deviation from the regulated ratio of Ca / S is allowed provided that compliance with the requirements of the Specification for corrosivity is met. Allowed the addition of titanium from the calculation of the mass fraction in steel no more than 0.030%. Steel should be subjected to vacuum degassing: the mass fraction of hydrogen in the liquid steel after degassing should be no more than 2.5ppm. The mass fraction of hydrogen is taken from the document on the quality of rolled sheets. With a hydrogen content of more than 2.5ppm, slabs should be subjected to anti-flock treatment (PFD) in heated or unheated rings. The mass fraction of Nb + V is not more than 0.15%. Permissible deviations in chemical composition: carbon + 0.010%, manganese + 0.020%, silicon ± 0.050%, sulfur + 0.0010%, phosphorus + 0.0030%, aluminum + 0.010%, copper +0.050 % by nickel +0,050, by chromium ± 0,050%, by vanadium + 0,020%, by nitrogen + 0,0010%. The carbon equivalent value should not exceed 0.43, and the resistance parameter for cracking P _cm should not exceed 0.24.
According to TU 14-158-116-99, the chemical composition is given for steel grade 09GSF. The total content of aluminum in steel should be in the range of 0.02-0.06%. Allowed the introduction of titanium in an amount up to 0.030%. Other requirements and deviations in accordance with the requirements of TU 14-1-1921 and GOST 19281. The carbon equivalent is determined in each melting and should not exceed 0.43%.