|Designation GOST Cyrillic||05ХГБ|
|Designation GOST Latin||05XGB|
|By chemical elements||05CrMnNb|
05ХГБ steel is used: for the production of welded longitudinal oil and gas pipes with improved corrosion resistance strength classes K48-K52, operated in the usual climatic conditions and regions of Siberia and the far North and used for the construction of oil-gathering system to transport corrosive gas, oil and formation water and petroleum products.
The minimum temperature of the environment in the construction of pipelines or minus 60 °C.
|Steel pipes and fittings to them||В62||TU 1380-062-05757848-2014|
According to TU 1380-062-05757848-2014 in the presence of additional requirements, an increase in the titanium content of not more than 0.020% is allowed. The hydrogen content in the steel before pouring is no more than 2.5 ppm. The chemical composition of the steel is chosen in such a way that the carbon equivalent of Ce and the resistance parameter for cracking Pcm do not exceed 0.41% and 0.24%, respectively. Admissible deviations by elements: by carbon + 0.1%, by manganese ± 0.020%, by sulfur + 0.0010%, by phosphorus + 0.0030%, by nitrogen + 0.0030%, by silicon + 0.020%, by chromium + 0.020%, niobium + 0.0050%, aluminum + 0.010%.
|sT|s0,2, MPa||σU, MPa||d5, %||KCU, kJ/m2|
|Electric-welded pipes TU 1380-062-05757848-2014|
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|
|Macrostructure and pollution||Pollution steel non-metallic inclusions - oxides stroke (OS), oxides of point (), silicates plastic (SP), silicates fragile (CX), a non-deformable silicates (SN) should not exceed when evaluating the average score is 2.5, sulfides (C), nitrides (N) - 1,0.|
|Microstructure||The amount of the actual grains of ferrite in the base metal of pipes and welded joints should be no larger than 9 rooms scale 1 according to GOST 5639. Banding of ferritic-pearlitic structure of base metal of pipes must not exceed 2 points in accordance with GOST 5640.|
|Corrosion resistance||The ve indicators are for tests along the axis of rolling of the metal. Resistance to hydrogen cracking in the NACE TM 0284: CLR≤6%, CTR≤3%; Resistance to sulfide corrosion stress cracking in the NACE TM 0177 (method A) 1: the threshold stress intensity factor, σth not less than 0.72 of the minimum specified yield strength; Resistance to General corrosion in ГОСТ9.908, in a medium containing 5% NaCl and 400-500 mg/l H2S: speed General corrosion ≤0.5 mm/year. Resistance to hydrogen cracking of welded joints according to NACE TM 0284: CLR≤6%, CTR≤3%|