Steel 03KH16N15M3B (026Х16Н15М3Б; ЭИ844Б)
|Designation GOST Cyrillic||03Х16Н15М3Б|
|Designation GOST Latin||03X16H15M3B|
|By chemical elements||03Cr16Н15Mo3Nb|
|Designation GOST Cyrillic||026Х16Н15М3Б|
|Designation GOST Latin||026X16H15M3B|
|By chemical elements||026Cr16Н15Mo3Nb|
|Designation GOST Cyrillic||ЭИ844Б|
|Designation GOST Latin||EI844B|
|By chemical elements||-|
03KH16N15M3B steel is used: for the manufacture of a tube blank; extremely thin-walled pipes of high precision; profile rolling of high accuracy; welded constructions working in the conditions of action of the boiling phosphoric, sulfuric, 10% acetic acid and sulfuric acid media intended for long-term service at operating temperatures to +600 °C.
High-temperature corrosion-resistant austenitic steel.
|Classification, nomenclature and General rules||В30||GOST 5632-72|
|Blanks. Of the workpiece. Slabs||В31||OST 3-1686-90, TU 14-1-1641-75|
|Bars and shapes||В32||TU 14-11-245-88|
|Steel pipes and fittings to them||В62||TU 14-3-219-89, TU 14-3-550-90|
According to TU 14-3-219-89, the chemical composition is specified for steel grade 026H16N15M3B (EI844B).
According to GOST 5632-72, the chemical composition is specified for steel grade 03H16N15M3B (EI844B).
According to TU 14-1-1641-75, the chemical composition is indicated for steel grade 026H16N15MZBU-ID (EI844BU-ID). Deviation according to the chemical composition is allowed: for carbon -0.0040%, for nitrogen + 0. 0050%, for phosphorus +0.0050%. The impurity content should be: cobalt ≤0.005%, copper ≤0.050%, arsenic ≤0.0050%, lead ≤ 0.00050%, cadmium ≤ 0.00050%, tin ≤0.0010%, aluminum ≤0.10%, zinc ≤0.0010%, antimony ≤0.0010%, bismuth ≤ 0.00050%, tantalum ≤0.0050%, titanium ≤0.050%, boron ≤0.0020%. At the same time, deviations in chemical composition are allowed: by the content of tantalum +0.0050%, by the content of cobalt +0.0050%, by the content of titanium +0.050%.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %|
|Tubular billet on the other 14-1-1641-75. Austenization at 1030-1100 °C (aging for 1 h), cooling in air or in water|
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||In the macrostructure of the workpiece on the other 14-1-1641-75 in the state of delivery should be free of cracks, gas bubbles, subcortical bubbles, turns brown, bundles, traces of shrinkage, niobium scabs and slag inclusions visible to the naked eye. Layer-by-layer crystallization and the square of the increased travelmasti are not rejection symptom. Under the control of the workpiece on the transverse microtemplate allowed: Central porosity - less than 1 point, point heterogeneity - not more than 1 score; - square of phase separation is not more than 1 score. In metal non-metallic inclusions shall not exceed the maximum score: - sulfides - 1.0 points; - stroke nitrides and carbonitrides - 2.0 points; - point nitrides and carbonitrides - 2.0 points. The total number of stroke and point nitrides and carbonitrides on each sample must not exceed 3 points. The total number of oxygen inclusions (granules and globules of oxides, spinels, silicates and silicate glasses) shall not exceed: a) from 1 to 2 inclusive divisions of the ocular scale in 2 sections - 50 inclusions on 6 sections - 150 inclusions; b) from 2 to 3 inclusive divisions of the ocular scale in 2 sections - 1 for on, - for 6 sections - 3 inclusions; C) larger than 3 divisions of the ocular scale are not allowed.|
|Corrosion resistance||03KH16N15M3B steel has higher resistance to pitting than steel 0ЗХ17Н14М3. Tubular billet on the other 14-1-1641-75 must be able to withstand the test of intercrystalline corrosion. Test for intergranular corrosion is performed on 2 samples according to GOST 6032 method AM 24, provoking a vacation at a temperature of 650° - 2 hours.|