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ASTM 403CB+, H46, B50A365, S40300, B50A365B,403 Details

403CB+, H46 grade stainless steel is an AOD + ESR melted alloy with additional alloying elements giving it good strength and temper resistance at higher temperatures up to 1200oF. Similar to the 410 stainless this grade has the ability to be heat treated to multiple different strength levels. Because of the temper resistance this alloy is soley used in the power generation market as steam and gas turbine blades.

General Electric Material B50A365 identifies a Chromium-Niobium alloy steel used for compressor blading, turbine blading, and forgings.
This specification contains the following classes:B50A365A, B50A365A1, B50A365B, B50A365, B1B50A365C, Electric furnace material, heat treated for final properties Electric furnace material, annealedConsumable - Electrode remelt material, heat treated for final propertiesConsumable - Electrode remelt material, annealed Forgings for Non-bucket applications - Consumable Electrode remelt material, heat treated for final properties.


Material shall be heated to a temperature of 2000-2050°F (1095-1135°C) and held at temperature for sufficient time to assure uniform temperature within the load and each part thereof. The material shall then be quenched in oil or rapidly moving air, as approved in the manufacturing process plan,to a temperature below the Mf martensite finish temperature, to assure complete transformation. Material made to Classes A and C and material that is made to Class B without straightening or cold finishing shall then be uniformly heated to a minimum tempering temperature of 1185°F (640°C), and held for the time necessary to achieve all of the required properties.

403CB+, H46, B50A365, S40300, B50A365B,403 Application:STAINLESS STEEL BAR & FORGINGS,CHROMIUM-NIOBIUM-IRON ALLOY

Category Type Grade Microstructure Designations
Grades Stainless Steels - Special Steels 403CB+, H46, B50A365, S40300, B50A365B,403 Martensite USA - ASTM , GE Approval to B50A365 - STAINLESS STEEL BAR & FORGINGS (CHROMIUM-NIOBIUM-IRON ALLOY, 403 Cb+)
ASTM A276 - Standard Specif i cation for Stainless Steel Bars and Shapes

Chemical composition(wt.%) of 403CB+, H46, B50A365, S40300, B50A365B,403 grade: GE Approval to B50A365

Elements Min.(≥) Max.(≤)
C 0.13 0.18
Si - 0.50
Mn 0.40 0.60
P - 0.030
S - 0.030
Cr 11.50 13.00
Ni - 0.50
Mo - 0.20
Nb 0.15 0.45
Al - 0.05

Mechanical properties of grade 403CB+, H46, B50A365, S40300, B50A365B,403 GE Approval to B50A365

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
158 (≥) 358 (≥) 31 42 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 314

Physical properties of grade 403CB+, H46, B50A365, S40300, B50A365B,403 GE Approval to B50A365

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
617 (≥) 681 (≥) 14 41 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 344
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
537 558 829

403CB+, H46, B50A365, S40300, B50A365B,403 - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
403CB+, H46, B50A365, S40300, B50A365B,403 ASTM USA
STAINLESS STEEL BAR & FORGINGS,CHROMIUM-NIOBIUM-IRON ALLOY

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