Alloy structural steel: 12Cr1MoV
Standard: GB / T 3077-1988
● Features and application:
Is a high-pressure, high pressure, sub-critical boiler superheater, set box, and main steam pipe widely used in steel. 580 ℃ still has a high thermal strength and oxidation resistance, a high lasting plasticity. Production process is relatively simple, good welding performance, but the normalized cooling rate sensitive. 580 ℃ will produce long-term use of pearlite spheroidization.
● Chemical Composition:
Carbon C: 0.08 ~ 0.15
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.40 ~ 0.70
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.90 ~ 1.20
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
Vanadium V: 0.15 ~ 0.30
Mo Mo: 0.25 ~ 0.30
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 490 (50)
Yield strength σs (MPa): ≥ 245 (25)
Elongation δ5 (%): ≥ 22
Reduction of area ψ (%): ≥ 50
Impact energy Akv (J): ≥ 71
Impact toughness αkv (J/cm2): ≥ 88 (9)
Hardness: ≤ 179HB
Sample size: sample blank size of 30mm
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 970 ℃, air-cooled; tempering 750 ℃, air-cooled.
Microstructure: bainite + ferrite.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.