AISI 685
2025-06-24 15:44:00 Origin： Remark：0 Click：
Specifications for precipitation hardening ASTM B637 Gr.685 Round bar, flat bar, forging, steelmaking, ESR melted, hot forging / rolling, heat treatment
TECHNICAL DATA SHEET - AISI 685
TECHNICAL SPECIFICATION: ASTM B637 - 2011
OFFICIAL TEST CERTIFICATE: issued by TUV - SGS - BV
MATERIAL CATEGORY: Precipitation hardening and cold worked nickel alloy
CHEMICAL COMPOSITIONS (mass weight %)
Carbon, C (％): 0.02 ~ 0.10
Silicon, Si (％): ≤ 0.75
Manganese, Mn (％): ≤ 1.00
Phosphorus, P (％) ≤: 0.025
Sulfur, S (％) ≤: 0.015
Chromium, Cr (％): 18.0 ~ 21.0
Cobalt, Co (%): 12.0 ~ 15.0
Molybdenum, Mo (％): 3.50 ~ 5.00
Niobiium, Nb/Ta (％): -
Titanium, Ti (%): 2.75 ~ 3.25
Aluminum, Al (%): 1.20 ~ 1.60
Zirconium, Zr (%): 0.02 ~ 0.12
Boron, B (%): 0.003 ~ 0.010
Ferrum, Fe (%): ≤ 2.00
Copper, Cu (%): ≤ 0.50
Nickel, Ni (%): Remainder
Tungsten, W (%): -
Nickel, Ni (%): Remainder
Tungsten, W (%): -
MECHANICAL PROPERTIES UNDER ROOM TEMPERATURE
Condition: Solution + Stabilize + Precipitation harden
Condition: Solution + Stabilize + Precipitation harden
Heat treatment pratice: Solution treatment 996 ~ 1038 Deg. hold 4h, water or oil quench.
Stabilizing treatment 843+/-14 Deg. hold 4h, air cool.
Precipitation hardening treatment, 760+/-14 Deg, hold 16h, air cooled or furnace cool.
Tensile strength, Rm ≥ MPa: 1100
Tensile strength, Rm ≥ MPa: 1100
Yield strength, Rp0.2 ≥ MPa: 760
Elongation, A5 ≥ (％): 15.0
Reduction of area, Z ≥ (％): 18.0
Hardness | HBW: 310 min.
STRESS RUPTURE REQUIREMENT
Test temperature: 816 Deg.
Stress /MPa: 230
Time to rupture: 100h
Elongtation, (%): 5.0
TYPICAL APPLICATIONS
Starndard specification for high-temperature bolting, with expansion coefficients comparable to austenitic Stainless steel with yield strength ranging from 345 to 827 MPa for use in high-temperature service such as fasteners for pressure vessel and valve flanges.
Nuclear reactor, Turbine engine parts - mechanical gears, gear shaft, main axis, blade
Mechanical parts - bolt and nut, fastener, Gas turbine blade, Fuel nozzle.
These materials must stand up to high heat, extreme oxidation potential and recycling.
FORMS AND DIMENSIONS
Rod / round bar / disc (diameter): 3.0mm to 800mm
Square bar / flat bar: 8mm to 600mm
Forging piece: stepped shafts, and other different shapes based on OEM.
Elongation, A5 ≥ (％): 15.0
Reduction of area, Z ≥ (％): 18.0
Hardness | HBW: 310 min.
STRESS RUPTURE REQUIREMENT
Test temperature: 816 Deg.
Stress /MPa: 230
Time to rupture: 100h
Elongtation, (%): 5.0
TYPICAL APPLICATIONS
Starndard specification for high-temperature bolting, with expansion coefficients comparable to austenitic Stainless steel with yield strength ranging from 345 to 827 MPa for use in high-temperature service such as fasteners for pressure vessel and valve flanges.
Nuclear reactor, Turbine engine parts - mechanical gears, gear shaft, main axis, blade
Mechanical parts - bolt and nut, fastener, Gas turbine blade, Fuel nozzle.
These materials must stand up to high heat, extreme oxidation potential and recycling.
FORMS AND DIMENSIONS
Rod / round bar / disc (diameter): 3.0mm to 800mm
Square bar / flat bar: 8mm to 600mm
Forging piece: stepped shafts, and other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE
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If you meet further on any technical enquiry. pleased to EMAIL (sales@ccsteels.com) our resident team of qualified production engineers.
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