Alloy20 stainless steel has good corrosion resistance to sulfuric acid chemicals, and good resistance to environmental corrosion such as chloride and phosphoric acid. It uses stable niobium-containing elements to resist sensitization and intergranular corrosion caused by the resultant force. It also has good mechanical properties and processability.
Chemical composition:
Carbon (C)≤0.07,
Manganese (Mn)≤2.0,
Nickel (Ni) 32.0~38.0,
Silicon (Si)≤1.0,
Phosphorus (P)≤0.045,
Sulfur (S)≤0.035,
Chromium (Cr) 19.0~21.0
Niobium (Nb) ≤1.0,
Aluminum (Al) ≤0.2,
Titanium (Ti) 0.6~1.2,
Copper (Cu) 3.0~4.0,
Molybdenum (Mo) 2.0~3.0
Physical properties:
density: 8.14g/cm3, melting point: 1370-1400 ºC, magnetism: none
Heat treatment: heat preservation between 900-1150ºC for 1-2 hours, fast air cooling or water cooling.
Mechanical properties: tensile strength: σb≥550Mpa, yield strength σb≥240Mpa: elongation: δ≥30%, hardness; HB135-220
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