General characteristics

Corrosion heat-resistant grade 12X18H9T is a chromium-Nickel austenitic steel. From it produce welded equipment (tanks and heat exchangers), to work in conditions of high atmospheric and soil moisture, in an oxidizing environment, HNO₃, mean concentrations of organic acids, organic solvents, under conditions of cryogenic temperatures of -196°C, etc.

Production

Is carried out according to the following GOST: 18907−73; 18143−72; 5632−72; 5949−75; 4405−75; 5582−75; 4986−79; 7350−77; 25054−81; 9941−81; 9940−81; and also specifications: 14−1-416−72, 14−1-565−84 and 14−1-377−72.

The chemical composition of the alloy 12X18H9T.

Is melted in open electric arc furnaces. This steel meets all the requirements of GOST. Made the following types of rentals: circle, sheet, pipe, wire, tape. During hot rolling and forging at the beginning of temperature = 1170 °C, and in the end — of about 900 °C.

Physical properties at 20°C

— The thermal conductivity of 0,134 · 102 W/(m · K).

— Specific gravity 7.9 g/cm³

— Modulus 18 · 10^{— 4} N/mm²

Hardness HB 200 MPa -1

— Resistivity 0.75 Omhm²/m.

— Specific heat 0,504 · 103, j/(kg · K);

— Magnetic permeability in a field of 500 e 1,255 micro Tesla/m.

Welding

Welded both manual and automatic welding. In the process of automatic submerged arc welding an-26 and an-18 and argon-arc welding electrodes take the welding rod of SV-06Х21Н7БТ SV-05Х20Н9ФБС SV-08Х19Н10Б and SV-04Х22Н10БТ; for the hand electrodes EA-1Ф2 brand TSL-2Б2, EA-606/11, GL-2 with rod of SV-08Х19Н9Ф2С2 SV-05Х19Н9ФЗС2 and SV-05Х19Н9ФЗС2. A shielding gas rod SV-08Х20Н9С2БТЮ used for automatic manual welding.

The electrodes of CL-11 and 9 with a rod of SV-07CR25NI13 SV-07Х19Н10Б used in manual electric arc welding. Control at AMU and AM GOST 6032−89 no specifically triggers the heating electrodes attach to the weld resistance to intergranular and General corrosion in nitric acid (65%) at a temperature of 70−80°C. However, the weld seams can be inclined to stab corrosion. The weld seams obtained with electrodes of CL-11 and 9, respectively, are: KCU=80 and 70 j/cm2; σв=550 and 600 N/mm2; δ=22 and 2%.

Use

Production of welded constructions operated in a temperature range of -196 +600°C in highly corrosive environments, without limiting the pressure. Also the steel used in the manufacture of castings for fragments of metallurgical mining equipment, vessels that are operated in wet-process phosphoric, 55% sulfuric acid and acetic acid increased, and other corrosive environments at t° to 80 °C.

12X18H9T steel used in equipment designed for the production of welding wire and welding electrodes, demand for connections of fittings, joints in pipelines, repair welds equipment that operates in a corrosive environment and the pipe housing unit.

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