B50A789(GTD 450) steel is a common material for manufacturing gas turbine compressor blades and guide vanes. From the perspective of composition characteristics, B50A789 steel is similar to alloy structural steel(0Cr17Ni4Cu4Nb), and both belong to precipitation hardening martensitic stainless steel 1, and its strengthening mechanism mainly relies on aging strengthening of copper-rich phase and precipitation strengthening of molybdenum and niobium. The Charpy impact test method is one of the important means to test the mechanical properties of materials, and is widely used to evaluate the ductile-brittle properties of B50A789 steel under impact loads.
B50A789 Class A, B, E, F, H, B50A789 Class G the composition and performance introduction.
|Grade||Chemical Composition WT %|
|UNS S45000||≤0.05||≤1.00||≤1.00||≤0.03||≤0.03||14.0-16.0||1.25-1.75||5-7||0.5-1.0||Nb >8 x (%C)|
|XM-25||≤0.05||≤1.00||≤1.00||≤0.03||≤0.03||14.0-16.0||1.25-1.75||5-7||0.5-1.0||Nb >8 x (%C)|
|ASTM A564||≤0.05||≤1.00||≤1.00||≤0.03||≤0.03||14.0-16.0||1.25-1.75||5-7||0.5-1.0||Nb >8 x (%C)|
|X 5 CrNiMoCuNb 14 5||≤0.07||≤1.00||≤0.70||≤0.04||≤0.015||13.0-15.0||1.20-2.00||5.0-6.0||1.20-2.00||0.15-0.60|
|Tensile strength||986 MPa||143000 psi|
|Yield strength (@ strain 0.200%)||814 MPa||118000 psi|
|Bulk modulus (typical for steel)||166 GPa||24100 ksi|
|Shear modulus (typical for steel)||83.9 GPa||12200 ksi|
|Charpy impact||125 - 141 J||92.2 - 104 ft-lb|
|Elongation at break (gage length is 4 times specimen diameter)||13.30%||13.30%|
|Hardness, Brinell (converted from Rockwell C hardness)||278||278|
|Hardness, Knoop (converted from Rockwell C hardness)||296||296|
|Hardness, Rockwell C||28||28|
|Hardness, Vickers (converted from Rockwell C hardness)||287||287|
|Density||7.80 cm³||0.282 lb/in³|
GTD 450, XM-25, S45000, 450 Alloy stainless steel alloy can be hot worked by soaking at 1150-1177°C (2100-2150°F) followed by cooling and fully annealing.
Custom 450, XM-25, S45000, 450 Alloy stainless steel alloy can be cold worked using all common techniques.
Custom 450, XM-25, S45000, 450 Alloy stainless steel alloy is annealed by soaking at 1024-1052°C (1875-7925°F) for 1 h followed by quenching in water or oil.
Custom 450, XM-25, S45000, 450 Alloy stainless steel alloy is soaked at specific temperature for 4 h followed by cooling to obtain condition H900, H950, H1000, H1050 or H1150.
GTD 450, XM-25, S45000, 450 Alloy stainless steel alloy can be welded using shielded methods to reduce contamination.
GTD 450, XM-25, S45000, 450 Alloy stainless steel alloy uses feeds and speeds comparable with other martensitic stainless steels. It is preferred to use positive feeds and slow speeds to achieve good results.