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High strength+fatigue resistance: Martensitic structure provides high room/medium temperature strength, suitable for thermal fatigue conditions with frequent start stop of heat exchangers;
Good corrosion resistance: resistant to atmospheric, freshwater, steam, and weakly corrosive media, suitable for general chemical and energy industries;
Moderate cost+good machinability: more economical than austenitic stainless steel (304/316), with controllable cutting and welding performance (requiring stress relief heat treatment after welding);
High temperature stability: The short-term working temperature can reach 540 ° C, suitable for medium temperature heat exchangers and steam systems.
United States: ASTM A182 F410, UNS S41000
Europe: EN1.4006, DIN X12Cr13
Japan: JIS SUS410
China: GB/T 12211Cr13
element | C | Si | Mn | P | S | Cr | Ni | Fe |
Standard value | ≤0.15 | ≤ 1.00 | ≤ 1.00 | ≤0.04 | ≤0.03 | 11.50~13.50 | ≤0.75 | margin |
performance | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Hardness (HB) |
index | ≥ 515 | ≥ 275 | ≥ 2 0 | ≤ 248 |
Raw materials: electric furnace/electric arc furnace smelting+LF/VD refining, ensuring low sulfur, low phosphorus, and no severe segregation;
Forging: Free forging/die forging, forging ratio ≥ 3, eliminating casting defects and refining grain size;
Heat treatment: normalizing (about 980 ° C)+tempering (about 700 ° C), stabilizing the structure and controlling hardness;
Testing: Chemical composition spectral analysis, mechanical property sample testing, UT (ultrasonic testing of forged parts), MT/PT (magnetic particle/penetrant testing of surface cracks), full size inspection, Ra control of sealing surface roughness (RF surface is usually Ra 3.2-6.3 μ m).
Petrochemical industry: hydrogenation reactor, reforming unit, shell and tube heat exchanger tube box flange;
Electricity: boiler feedwater preheater, condenser;
Pressure vessels: tank inlet and outlet flanges, heat exchanger tube plate flanges.
