MICROALLOYED MARTENSITIC STAINLESS STEEL GRADE 403Cb WITH IMPROVED TOUGHNESS AND STRENGTH
AssigneeGeneral Electric Company
InventorsYuanping LI, Qian LI
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Abstract
The microalloyed martensitic stainless steel grade 403Cb disclosed herein specifies a composition range including a minimum level and a maximum level that improves material properties leading to increased toughness and strength. In addition, a chromium-nickel equivalent balance (CNB) is controlled within a proper level. With increased toughness and strength, the sensitivity to temper brittleness is decreased.
Claims14
A microalloyed martensitic stainless steel grade 403Cb consisting essentially of, by weight percent:
- carbon
- 0.13 to 0.18
- manganese
- 0.40 to 0.60
- silicon
- up to 0.50
- phosphorous
- up to 0.025
- sulfur
- up to 0.010
- nickel
- 0.30 to 0.60
- chromium
- 11.5 to 13.0
- molybdenum
- 0.05 to 0.20
- niobium
- 0.15 to 0.25
- vanadium
- up to 0.10
- iron
- balance
- CNB (Cr—Ni equivalent balance)
- 5.0 to 7.5.
A microalloyed martensitic stainless steel grade 403Cb consisting essentially of, by weight percent:
- carbon
- 0.13 to 0.18
- manganese
- 0.40 to 0.60
- silicon
- up to 0.50
- phosphorous
- up to 0.025
- sulfur
- up to 0.010
- nickel
- 0.30 to 0.6
- chromium
- 11.5 to 13.0
- molybdenum
- 0.05 to 0.2
- niobium
- 0.15 to 0.25
- vanadium
- up to 0.10
- iron
- balance
- CNB (Cr—Ni equivalent balance)
- 5.0 to 7.5,
- and having an impact toughness ranging over 50 J.
A turbine component comprising a microalloyed martensitic stainless steel grade 403Cb comprising, by weight percent:
- carbon
- 0.13 to 0.18
- manganese
- 0.40 to 0.60
- silicon
- up to 0.50
- phosphorous
- up to 0.025
- sulfur
- up to 0.010
- nickel
- 0.30 to 0.60
- chromium
- 11.5 to 13.0
- molybdenum
- 0.05 to 0.20
- niobium
- 0.15 to 0.25
- vanadium
- up to 0.10
- iron
- balance
- CNB (Cr—Ni equivalent balance)
- 5.0 to 7.5,
- and wherein a weight ratio of the nickel to the molybdenum is larger than 3.
Dependencies are inferred from the claim text.