Semba, Hiroyuki; Igarashi, Masaaki;

Austenitic stainless steel

An austenitic stainless steel excellent in high temperature strength, high temperature ductility and hot workability, consisting of, by mass %, C: more than 0.05% to 0.15%, Si: 2% or less, Mn: 0.1 to 3%, P: 0.04% or less, S: 0.01% or less, Cr: more than 20% to less than 28%, Ni: more than 15% to 55%, Cu: more than 2% to 6%, Nb: 0.1 to 0.8%, V: 0.02 to 1.5%, sol. Al: 0.001 to 0.1%, but sol.Al≦0.4×N, N: more than 0.05% to 0.3% and O (Oxygen): 0.006% or less, but O≦1/(60×Cu), and the balance Fe and impurities. The austenitic stainless steel may contain at least one of Co, Mo, W, Ti, B, Zr, Hf, Ta, Re, Ir, Pd, Pt and Ag, and/or at least one of Mg, Ca, Y, La, Ce, Nd and Sc.

• Image processing apparatus Biomedical imaging and analysis
• Reflection corrected radiosity optical pyrometer Bladder for water gun
• Passive solar heat collector Ionization type smoke detector
• Optical fiber splice case Austenitic stainless steel
• Pressing arrangement Portable barbecue system
• High speed frequency-shift keying decoder Insulated container
• Device for trapping flying insects Single-poly neuron MOS transistor
• Vehicle roof structure DNA encoding serotonin receptors
• Surgically implantable power supply Limited broadcast system
• Vapor generating hair roller Magnetic recording medium
• Revolution sensor Head support
• Apparatus for culturing animal cells 7-Azoxy substituted-1,4-benzodiazepin-2-ones
• Satellite communications system Oil film damper
• Piston deceleration system Process and composition
• Calibration devices Car door locking system
• Milled liquid developer Guanine Cytosine (GC)-rich DNA/PNA microbolometer
• Hydraulic drive type working vehicle Stabilization of ambient cured coatings
• Hook inserter device Antitheft mechanism for gasoline pump
• Low-power integrated circuit memory Magnetic tape
• ITU/TDD modem Piezoelectric unit cell
• Motorized hide-a-bed actuating mechanism Pencil ignition coil assembly module
• Ash melting furnace Vehicle service lift
• Floor cleaning machine and method Duplicate notepaper case
• Address code arrangements Cushion
• Fluid delivery apparatus Pumpable water-containing surfactant concentrates

1. An austenitic stainless steel characterized by consisting of, by mass %, C: more than 0.05% to 0.15%, Si: 2% or less, Mn: 0.1 to 3%, P: 0.04% or less, S: 0.01% or less, Cr: more than 20% to less than 28%, Ni: more than 15% to 55%, Cu: more than 2% to 6%, Nb: 0.1 to 0.8%, V: 0.02 to 1.5%, sol.Al: 0.001 to 0.1%, N: more than 0.05% to 0.3% and O (Oxygen): 0.006% or less, and the balance Fe and impurities, further characterized by satisfying the following formulas (1) and (2):



wherein each element symbol in the formulas (1) and (2) represents the content (mass %) of each element.

2. An austenitic stainless steel characterized by consisting of, by mass %, C: more than 0.05% to 0.15%, Si: 2% or less, Mn: 0.1 to 3%, P: 0.04% or less, S: 0.01% or less, Cr: more than 20% to less than 28%, Ni: more than 15% to 55%, Cu: more than 2% to 6%, Nb: 0.1 to 0.8%, V: 0.02 to 1.5%, sol.Al: 0.001 to 0.1%, N: more than 0.05% to 0.3% and O (Oxygen): 0.006% or less, and at least one element selected from the group consisting of Co: 0.05 to 5%, Mo: 0.05 to 5%, W: 0.05 to 10%, Ti: 0.002 to 0.2%, B: 0.0005 to 0.05%, Zr: 0.0005 to 0.2%, Hf: 0.0005 to 1%, Ta: 0.01 to 8%, Re: 0.01 to 8%, Ir: 0.01 to 5%, Pd: 0.01 to 5%, Pt: 0.01 to 5% and Ag: 0.01 to 5%, and the balance Fe and impurities, further characterized by satisfying the following formulas (1) to (3):




wherein each element symbol in the formulas (1) to (3) represents the content (mass %) of each element.

3. An austenitic stainless steel characterized by consisting of, by mass %, C: more than 0.05% to 0.15%, Si: 2% or less, Mn: 0.1 to 3%, P: 0.04% or less, S: 0.01% or less, Cr: more than 20% to less than 28%, Ni: more than 15% to 55%, Cu: more than 2% to 6%, Nb: 0.1 to 0.8%, V: 0.02 to 1.5%, sol.Al: 0.001 to 0.1%, N: more than 0.05% to 0.3% and O (Oxygen): 0.006% or less, and at least one element selected from the group consisting of Mg: 0.0005 to 0.05%, Ca: 0.0005 to 0.05%, Y: 0.0005 to 0.5%, La: 0.0005 to 0.5%, Ce: 0.0005 to 0.5%, Nd: 0.0005 to 0.5% and Sc: 0.0005 to 0.5%, and the balance Fe and impurities, further characterized by satisfying the following formulas (1) and (2)



wherein each element symbol in the formulas (1) and (2) represents the content (mass %) of each element.

4. An austenitic stainless steel characterized by consisting of, by mass %, C: more than 0.05% to 0.15%, Si: 2% or less, Mn: 0.1 to 3%, P: 0.04% or less, S: 0.01% or less, Cr: more than 20% to less than 28%, Ni: more than 15% to 55%, Cu: more than 2% to 6%, Nb:0.1 to 0.8%, V: 0.02 to 1.5%, sol.Al: 0.001 to 0.1%, N: more than 0.05% to 0.3% and O (Oxygen): 0.006% or less, and at least one element selected from the group consisting of Co: 0.05 to 5%, Mo: 0.05 to 5%, W: 0.05 to 10%, Ti: 0.002 to 0.2%, B: 0.0005 to 0.05%, Zr: 0.0005 to 0.2%, Hf: 0.0005 to 1%, Ta: 0.01 to 8%, Re: 0.01 to 8%, Ir: 0.001 to 5%, Pd: 0.01 to 5%, Pt: 0.01 to 5% and Ag: 0.01 to 5%, and further at least one element selected from the group consisting of Mg: 0.0005 to 0.05%, Ca: 0.0005 to 0.05%, Y: 0.0005 to 0.5%, La: 0.0005 to 0.5%, Ce: 0.0005 to 0.5%, Nd: 0.0005 to 0.5% and Sc: 0.0005 to 0.5%, and the balance Fe and impurities, further characterized by satisfying the following formulas (1) to (3)




wherein each element symbol in the formulas (1) to (3) represents the content (mass %) of each element.

5. An austenitic stainless steel according to claim 1, further characterized by satisfying the following formula (4)


wherein each element symbol in the formula (4) represents the content (mass %) of each element.

6. An austenitic stainless steel according to claim 2, further characterized by satisfying the following formula (4)


wherein each element symbol in the formula (4) represents the content (mass %) of each element.

7. An austenitic stainless steel according to claim 3, further characterized by satisfying the following formula (4)


wherein each element symbol in the formula (4) represents the content (mass %) of each element.

8. An austenitic stainless steel according to claim 4, further characterized by satisfying the following formula (4)


wherein each element symbol in the formula (4) represents the content (mass %) of each element.