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Manufactured in USA by SMC/ATI/HAYNES - Premium nickel-based alloy plate and sheet materials in stock
General Properties
Alloy 625 is an austenitic nickel-chromium-molybdenum-niobium alloy offering exceptional corrosion resistance combined with high strength across temperatures from cryogenic conditions up to 1800°F (982°C).
The alloy's strength comes from solid-solution hardening provided by molybdenum and niobium within the nickel-chromium matrix, eliminating the need for precipitation-hardening treatments.
Key Characteristics
Outstanding corrosion resistance in severe operating environments
Excellent resistance to oxidation and carburization at high temperatures
Resistant to pitting, crevice corrosion, impingement corrosion, and intergranular attack
Virtually immune to chloride stress corrosion cracking
Easily welded and processed using standard fabrication practices
Applications
Inconel 625 plate and sheet serve critical roles across multiple industries:
Air Pollution Control: Chimney liners, dampers, flue gas desulfurization components
Chemical Processing: Equipment handling oxidizing and reducing acids, super-phosphoric acid production
Marine Service: Steam line bellows, Navy ship exhaust systems, submarine auxiliary propulsion
Nuclear Industry: Reactor core components, control rod parts, waste reprocessing equipment
Offshore Oil & Gas: Waste flare gas stacks, piping systems, riser sheathing, sour gas piping
Petroleum Refining: Waste flare gas stacks
Waste Treatment: Waste incineration components
Standards Compliance
ASTM B443 | ASME SB443 | AMS 5599
Chemical Composition
Weight % (maximum values unless range indicated)
Element
Content
Element
Content
Nickel
58.0 min.
Silicon
0.50
Chromium
20.0-23.0
Phosphorus
0.015
Molybdenum
8.0-10.0
Sulfur
0.015
Iron
5.0
Aluminum
0.40
Niobium + Tantalum
3.15-4.15
Titanium
0.40
Carbon
0.10
Cobalt
1.0
Manganese
0.50
Physical Properties
Property
Imperial
Metric
Density
0.305 lbs/in³
8.44 g/cm³
Specific Heat
0.102 BTU/lb-°F (32-212°F)
427 J/kg-°K (0-100°C)
Modulus of Elasticity
30.1 x 10⁶ psi
207.5 GPa
Thermal Conductivity
75 BTU/hr/ft²/ft/°F
10.8 W/m-°K
Melting Range
2350-2460°F
1290-1350°C
Electrical Resistivity
50.8 Microhm-in at 70°C
128.9 Microhm-cm at 210°C
Thermal Expansion
Temperature °F
Temperature °C
in/in/°F
cm/cm°C
200
93
7.1 x 10⁻⁶
12.8 x 10⁻⁶
400
204
7.3 x 10⁻⁶
13.1 x 10⁻⁶
600
316
7.4 x 10⁻⁶
13.3 x 10⁻⁶
800
427
7.6 x 10⁻⁶
13.7 x 10⁻⁶
1000
538
7.8 x 10⁻⁶
14.0 x 10⁻⁶
1200
649
8.2 x 10⁻⁶
14.8 x 10⁻⁶
1400
760
8.5 x 10⁻⁶
15.3 x 10⁻⁶
1600
871
8.8 x 10⁻⁶
15.8 x 10⁻⁶
1700
927
9.0 x 10⁻⁶
16.2 x 10⁻⁶
Mechanical Properties
Typical Values at 68°F (20°C)
Property
Imperial
Metric
Yield Strength (0.2% Offset)
65,000 psi (min.)
448 MPa
Ultimate Tensile Strength
125,000 psi (min.)
862 MPa
Elongation in 2 in.
50% (min.)
Hardness
200 Brinell (max.)
Corrosion Resistance
Alloy 625 demonstrates exceptional corrosion resistance across diverse severe environments, with virtual immunity to attack in mild conditions including atmosphere, fresh and sea water, neutral salts, and alkaline solutions.
Acid Resistance Performance
Alloy
Corrosion Rate (mpy)
Corrosion Rate (mm/a)
Alloy 625 in 40% Formic Acid
6.8-7.8
0.17-0.19
Alloy 625 in 10% Acetic Acid
0.39-0.77
0.01-0.19
Seawater Impingement Resistance
Alloy 625 shows nil corrosion/erosion rate in seawater at 150 ft/sec (45.7 m/s)
Pitting Resistance Comparison
Alloy
PREN Value
316 Stainless Steel
20.4
317 Stainless Steel
23.7
Alloy 825
26.0
Alloy 625
40.8
Alloy C-276
45.2
Fabrication Data
Hot Forming
Working temperature range: 1650-2150°F (900-1177°C). Heavy working near 2150°F, lighter working down to 1700°F. Use uniform reductions to prevent duplex grain structure.
Cold Forming
Perform in annealed condition using standard practices. Work hardening rates exceed those of austenitic stainless steels.
Welding
Compatible with GTAW (TIG), PLASMA, GMAW (MIG/MAG), SAW and SMAW (MMA) processes. No post-weld heat treatment required. Stainless steel wire brushing removes heat tint.
Machining
Machine in annealed condition using low cutting speeds with continuous tool engagement. Adequate cut depth prevents contact with work-hardened zones.
Packaging
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2012
Total Annual:
500,000,000-800,000,000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h... Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h...
