Steel 13HFA (13ХФ)
|Designation GOST Cyrillic||13ХФА|
|Designation GOST Latin||13XFA|
|By chemical elements||13CrV|
|Designation GOST Cyrillic||13ХФ|
|Designation GOST Latin||13XF|
|By chemical elements||13CrV|
13HFA steel is used: for the manufacture of billets and pipes seamless hot-deformed oil and gas increased corrosion resistance and cold-resistance, designed for use in systems transporting gas, systems, oil and gas pipelines, technological pipelines, transporting oil and oil products, as well as in the systems of reservoir pressure maintenance in the Northern climatic zones at ambient temperatures from -60°C to +40°C, temperature of the transported media from +5°C to +40°C and operating pressure up to 7.4 MPa; seamless hot-deformed pipes with improved corrosion and cold-resistance (article 13HFA) with an outer diameter from 60 to 426 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); for the manufacture of electric-welded longitudinal pipes ekspandirovannogo increased corrosion resistance and cold-resistance, used for pipelines, process and field pipelines for operating pressure up to 7.4 MPa to transport crude oil and petroleum products, pipelines of formation pressure maintenance in any climatic zones.
Structural alloy steel of high corrosion resistance and cold-resistance. Pipe oil and gas differ from conventional pipes according to GOST 8731, GOST 8732, high cold resistance, high resistance to General and pitting corrosion, resistance to sulfide corrosion cracking and hydrogen cracking.
|Steel pipes and fittings to them||В62||TU 1383-010-48124013-03, TU 1317-006.1-593377520-2003, TU 1381-116-00186654-2013, TU 1317-233-0147016-02, TU 14-3Р-124-2012, TU 1380-281-00147016-2004, TU 1380-282-00147016-2004, TU 14-1-5598-2010, TU 1381-073-05757848-2014, TU 1303-007-12281990-2015, TU 1319-369-00186619-2012|
According to TU 1383-010-48124013-03 the chemical composition is given for steel grade 13HFA. To ensure the fine-grainedness and the binding of nitrogen to nitrides and carbonitrides, the introduction of titanium and niobium is allowed not more than 0.030% and 0.040%, respectively. For globularization of nonmetallic inclusions, steel is deoxidized by silicocalcium or cerium. The total content of Nb + V + Ni ≤ 0.15%.
According to TU 1317-006.1-593377520-2003 the chemical composition is given for steel grade 13HFA. The mass fraction of hydrogen in steel in the pipe metal should not exceed 1.0 ppm (2.0 ppm in the ladle sample). The introduction of niobium and titanium is possible from the calculation of the mass fraction to 0.030% and 0.010%, respectively. In the deoxidized steel for the globularization of sulfide inclusions, calcium (silicocalcium) or cerium is introduced from the calculation of a mass fraction of 0.050%.
According to TU 1381-116-00186654-2013 the chemical composition is given for steel grade 13HFA. 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 1319-369-00186619-2012 the chemical composition is given for steel grade 13HFA on the ladle sample. The steel must be subjected to modifying treatment with calcium alloys and / or rare earth elements (cerium, etc.). In the case of using a modifying element only calcium, the ratio of the mass fraction of calcium to the mass fraction of sulfur in the steel should be at least 1.0. The total mass fraction of calcium is not more than 0.0060%. The hydrogen content in the liquid steel should not be more than 2.5 ppm. It is permissible to introduce titanium, niobium and other carbonitride-forming elements into the steel. The total mass fraction of titanium, niobium and vanadium should not be more than 0.15%. The carbon equivalent value should not be more than 0.40% for pipes with a wall thickness of less than 14 mm, and not more than 0.43% for pipes with a wall thickness of 14 mm or more.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %||KCU, kJ/m2||HRC||HRB||HV, MPa|
|Plates for pipes according to TU 1381-116-00186654-2013 (samples transverse, are indicated in the graph KCU KCV-40°C)|
|Pipe the seamless hot-deformed oil and gas increased corrosion resistance and cold-resistance on the other 1383-010-48124013-03. In the state of delivery (specified marsvolta metal pipes and KCV-40 °C)|
|Pipe the seamless hot-deformed heat-treated in the delivery condition on the other 1319-369-00186619-2012. In the graph indicated KCU KCV-50°C/KCU-60°C)|
|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)|
|Seamless tubes gas & oil heat-treated in the delivery condition on the other 1317-233-0147016-02 (samples in the delivery condition specified strength class, in the column the value is KCU KCV-50 °C)|
|Pipe on the other 1381-116-00186654-2013 (samples transverse, are indicated in the graph KCU KCU-60°C/KCV-20°C)|
Description mechanical marks
|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|
|HRC||Rockwell hardness (indenter diamond spheroconical)|
|HRB||Rockwell hardness (indenter steel, spherical)|
|HV||The Vickers hardness|
A description of the physical symbols
|Е||The normal elasticity modulus|
|l||Coefficient of thermal conductivity|
|R||UD. the resistivity|
|Macrostructure and pollution||Contamination of the steel pipes on the other 1319-369-00186619-2012 non-metallic inclusions shall not exceed the average score (not to exceed): sulphide (S) and 1.5 for pipes production path, the 2.5 pipe from other manufacturers; oxides (FROM, OS) - 2,5; silicates (CX, SP, SN) of 2.5; nitrides - 1,0.|
|Microstructure||In the microstructure of tubes subjected to the heat treatment in the mode "full annealing + vacation" should be no more than two continuous strips of ferrite; it allowed a few torn strips of ferrite. Banding of the microstructure of steel pipe subjected to the heat treatment in the mode "full hardening + tempering from MKI + vacation" or "normalization + tempering from MKI + holiday" should not exceed 2 points of the scale 3 the GOST 5640.|
|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. On the other 1381-116-00186654-2013: Speed General corrosion ≤0.5 mm/year; Resistance to hydrogen cracking in the CLR≤6%, CTR≤3%; Resistance to stress corrosion cracking under tension σth ≥70% of σT.|
|The corrosion rate||The rate of General corrosion should not exceed 0.5 mm/year.|