Steel 09СФА (09СФ)

Designation

Name The value
Designation GOST Cyrillic 09СФА
Designation GOST Latin 09CFA
Transliteration 09SFA
By chemical elements 09СV
Name The value
Designation GOST Cyrillic 09СФ
Designation GOST Latin 09CF
Transliteration 09SF
By chemical elements 09СV

Description

09СФА steel is used: for the manufacture of seamless hot-deformed pipes with improved corrosion and cold-resistance (article 09СФА), with an outer diameter from 89 to 325 mm, strength class not less than K52, infield pipelines, transporting products of oil wells (pipelines and pressure pipelines at pressures up to 4.6 MPa) and in the systems of reservoir pressure maintenance in terms of oil production enterprises.

Note

Structural alloy steel of high corrosion resistance and cold-resistance.

Standards

Name Code Standards
Steel pipes and fittings to them В62 TU 14-162-14-96, TU 1317-006.1-593377520-2003

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N Al V
TU 14-162-14-96 0.08-0.12 ≤0.015 ≤0.015 0.6-0.8 ≤0.25 0.5-0.7 ≤0.25 Rest ≤0.25 - 0.025-0.05 0.04-0.1
TU 1317-006.1-593377520-2003 0.07-0.13 ≤0.01 ≤0.015 0.5-0.8 ≤0.3 0.5-0.8 ≤0.3 Rest ≤0.3 ≤0.008 0.02-0.05 0.05-0.12
Fe is the basis.
According to TU 1317-006.1-593377520-2003 the chemical composition is given for steel grade 09СФА. The mass fraction of hydrogen in the steel in the metal of the pipe should not exceed 1.0 ppm (2.0 ppm in the ladle sample, niobium and titanium can be added from the calculation of the mass fraction to 0.030% and 0.010%, respectively.) In the deoxidized steel for the globularization of sulfide inclusions enter calcium (silicocalcium) or cerium from the calculation of the mass fraction of 0.050%.
According to TU 14-162-14-96 the chemical composition is given for steel grade 09SFA. In the steel, deviations in the carbon content (+0,020%), aluminum (+0,010%), manganese (+0,10%), sulfur (+0,005%), phosphorus (+0,005%) are allowed. Modification of the steel by ferrosilicon or silicocalcium is possible with the calculation of the content of cerium and calcium in the steel of 0.050% each, the content of which is not controlled, and the calculated values ​​are entered in the certificate.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % KCU, kJ/m2 HRB
Pipe the seamless hot-deformed heat-treated in the delivery condition on the other 14-162-14-96
338-470 461-627 ≥28 - ≤90
Seamless tubes gas & oil heat-treated in the delivery condition on the other 1317-006.1-593377520-2003 (samples in the delivery condition specified strength class, in the column the value is KCU KCV-50 °C)
89-325 372-491 ≥510 ≥23 ≥980 ≤92

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
KCU Toughness
HRB Rockwell hardness (indenter steel, spherical)

Technological properties

Name The value
Corrosion resistance In the medium H2S: speed General corrosion ≤ 0.5 mm/year; resistance to hydrogen cracking in the CLR ≤ 3 % CTR ≤ 6 %; resistance to sulfide corrosion cracking with voltage ≥ 75 % of σ0,2.