Steel 06Х16Н15М3БР (ЭП172)
|Designation GOST Cyrillic||06Х16Н15М3БР|
|Designation GOST Latin||06X16H15M3BP|
|By chemical elements||06Cr16Н15Mo3NbB|
|Designation GOST Cyrillic||ЭП172|
|Designation GOST Latin||EP172|
|By chemical elements||-|
06Х16Н15М3БР steel is used: for the manufacture of pipes of the superheaters and steam pipelines of high pressure and nuclear power plants, long rabotayushih at temperatures up to +350 °C.
Steel heat-resistant austenitic class.
The recommended maximum operating temperature for a very long time +350 °C.
The temperature of beginning of intensive scaling in air +850 °C.
|Classification, nomenclature and General rules||В30||GOST 5632-72|
|Blanks. Of the workpiece. Slabs||В31||OST 3-1686-90, TU 14-1-3723-84|
|Bars and shapes||В32||TU 14-11-245-88|
|Steel pipes and fittings to them||В62||TU 14-3-219-89|
According to TU 14-3-219-89 the chemical composition is given for steel grade 06H16N15M3BR-VD (EP172U-VD). Steel grade 06H16N15M3BR (EP172) is characterized by a mass fraction of the following elements: C = 0,05-0,09%, Cr = 15,0-17,0%, Ni = 15,0-17,0%, Nb = 0,40 -1.10%, Si≤ 0.60%, Mn≤ 0.80%, S≤ 0.020%, P≤ 0.025%, N≤ 0.050%.
According to TU 14-1-3723-84, the chemical composition is given for steel grade 06H16N15M3BB-VD (EP172-VD), 06H16N15MZBR-ID (EP172-ID). In the finished metal, a deviation from the mass fraction of chemical elements is allowed: in niobium +0,050%, in aluminum +0,050%, in silicon ± 0,050%. Processing of REM metal up to 0.15% by calculation is allowed. In the tube billet of steel grade 06H16N15MZBR-ID (EP172-ID), the nitrogen content should not exceed 0.020%. The ratio of the content of niobium to the carbon content should be in the range of 9 ÷ 13. Additionally, the content of copper and lead is determined - the results are recorded in the certificate.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %|
|Tubular billet on the other 14-1-3723-84. The longitudinal samples. Annealing in air or in water 1050-1100 °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|
|Macrostructure and pollution||The macrostructure of the billet should not have shrinkage and looseness, cracks, curled up crusts, inclusions, delaminations, visible without using the magnifying devices. Allowable defects of the macrostructure shall not exceed: Central porosity - 1.0 points, point heterogeneity - 1.0 points, exudation square - 1.0 points. Layer-by-layer crystallization and the square of the increased travelmasti are not rejection symptom. In the metal tube blank, the content of nonmetallic inclusions shall not exceed the maximum score sulphide - score of 1.0, oxides of point - score of 2.0, the oxides of stroke - score of 2.0, silicates fragile - score of 2.0, silicates plastic - score of 1.0, non-deformed silicates - score of 1.0. The content of the nitrides and carbonitrides but should be less than 2.5 points. It is possible to supply metal with nitrides and carbonitrides with a 3.0 GPA in the amount of not more than 30 % of the order.|