Heat-resistant steel bars Grade: 2Cr12NiMoWV
Standard
GB / T 1221-1992
● Features and Scope
For high temperature structural components, turbine blades, plates, impeller shaft, bolts and so on. Commonly used in the manufacture of boilers, turbines, power machinery, industrial furnace and air, petrochemical and other industrial sectors to work in high temperature components. In addition to these components requires high temperature strength and high temperature oxidation corrosion, according to different purposes also requires a sufficient toughness, good processability and welding, as well as certain organizational stability. Since 1952, China began to produce heat-resistant steel. After the development of some new type of low-alloy steel, hot and strong, so strong pearlite steel operating temperature heat to 600 ~ 620 ℃; In addition, the development of some new low-chromium-nickel steel oxidation.
● Chemical Composition
Carbon C: 0.20 ~ 0.25
Si Si: ≤ 0.50
Manganese Mn: 0.50 ~ 1.00
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 11.00 ~ 13.00
Ni-Ni: 0.50 ~ 1.00
Vanadium V: 0.20 ~ 0.40
Mo Mo: 0.75 ~ 1.25
Tungsten W: 0.70 ~ 1.25
● Mechanical Properties
Tensile strength σb (MPa): quenching and tempering, ≥ 885 conditions yield strength σ0.2 (MPa): quenching and tempering, ≥ 735 elongation δ5 (%): quenching and tempering, ≥ 10 Reduction of area ψ (% ): quenching and tempering, ≥ 25 hardness: annealed, ≤ 269HB; quenching and tempering, ≤ 341HB
● Heat treatment and microstructure specifications heat treatment specifications: 1) annealing, 830 ~ 900 ℃ slow cooling; 2) quenching, 1020 ~ 1070 ℃ oil-cooling or air-cooled; 3) tempering, 600 ℃ above air cooling. Microstructure: Organizing for the martensitic type.
● delivery status
Delivery usually to heat treatment standard state, the treatment types specified in the contract; not indicated, according to the heat treatment state of delivery.
