|Designation GOST Cyrillic||09Х18Н9|
|Designation GOST Latin||09X18H9|
|By chemical elements||09Cr18Н9|
09Х18Н9 steel is used: for the production of billets; hot rolled seamless tubes for shipbuilding outer diameter 108−325 mm; electropolishing cold-deformed seamless tubes (including the facilities and equipment of nuclear power); seamless cold-deformed pipes with an outer diameter of 108−194 with a high surface quality for power.
Stainless steel with controlled ferrite.
|Processing of metals by pressure. Forgings||В03||ST ЦКБА 010-2004|
|Blanks. Of the workpiece. Slabs||В31||TU 14-1-1288-75, TU 14-1-3119-81|
|Bars and shapes||В32||TU 14-1-1326-75|
|Sheets and strips||В33||TU 14-1-3409-82|
|Steel pipes and fittings to them||В62||TU 14-3-1061-81, TU 14-3-52-72, TU 14-3-760-78, TU 14-159-295-2004, TU 14-161-216-2003, TU 14-3-1233-84, TU 14-3-1956-94|
According to TU 14-161-216-2003, TU 14-3-1956-94 and TU 14-159-295-2004 the allowable deviation in the content of C (carbon) is minus 0.01%. Residual content of elements in the chemical composition of steel - according to GOST 5632.
According to TU 14-1-3119-81 for steel grade 09H18N9, deviations in chemical composition are allowed: by carbon-0.010%, molybdenum ± 0.050%, vanadium ± 0.050%. The content of impurities of non-ferrous metals (tin, arsenic, lead, zinc, antimony, bismuth) should not exceed the 1 st point of a ten-point scale of spectral analysis. The content of residual elements in steel should be in accordance with GOST 5632.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %|
|The tubular billet. Quenching in water from 1050-1080 °C, cooling in water or air on the other 14-1-1288-75|
|Tubes seamless cold-drawn heat-treated in the delivery condition on the other 14-159-295-2004, THE 14-161-216-2003|
|Pipe heat-treated in the delivery condition on the other 14-3-1956-94|
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||Contamination of the metal pipes, non-metallic inclusions on the other 14-159-295-2004 should be on the maximum score: - Oxides (FROM, OS) ≤ 4 points; - Sulphides (S) ≤ 3 points; - Silicates (CX, SP) - 3 points; - Silicates, non-deformed ≤ 4 points.|
|Microstructure||On the other 14-3-1956-94, THE 14-159-295-2004 the ferrite content in the steel should be in the range 1.0-4.0%. Grain size of the metal pipes on the other 14-159-295-2004 in the state of delivery should be not larger than 5 rooms.|
|Particularities of production of goods||Tubes are delivered in heat-treated (austenitisation) and the reign of the state and must be subjected to radiographic inspection. On the other 14-159-295-2004 pipes up to 40 mm inclusive must pass the test to the distribution to increase the outer diameter by 10% a mandrel with the taper angle 30° and must withstand a hydraulic test pressure in accordance with GOST 3845 with allowable stress equal to 40% of the strength of steel. The ability of pipe to withstand hydraulic test pressure is provided by the production technology and can be guaranteed by the manufacturer without testing.|