Inconel 625 Screws

Inconel 625/Alloy 625 (2.4856) Key Benefits:

• Very good corrosion resistance at elevated temperatures
• High temperature stability up to 2200°F (982°C)
• High strength material with excellent toughness at elevated temperatures
• Inconel 625 datasheet

Developed in the 1960’s as a material for steam-lined piping, Inconel® 625 (2.4856) screws deliver high strength, even at extreme high temperatures from freezing cryogenics to 1800°F. Also known as alloy 625, Inconel 625 screws are renowned for their amazing ability to retain their strength and resist heat, both in and out of corrosive environments. The presence of nickel and chromium make Inconel 625 screws corrosion, oxidation and carburization resistant. The molybdenum also helps to deliver excellent fatigue strength and resistance to stress, pitting and crevice corrosion cracking even when exposed to chloride ions.

Corrosion Resistance

Due to ability of Inconel 625 screws to prevent, stress, crevice and pitting corrosion, it is utilized in a diversity of corrosive environments. In mild applications such as atmosphere, fresh or salt water, neutral salts and alkaline media is is almost completely resistant. In more severe situations the nickel and chromium content provides resistance to oxidizing chemicals. Inconel 625 screws are also resistant to nonoxidizing environments. Better understand Inconel 625's corrosion resistance to:

• Sulfuric Acid
• Hydrochloric Acid
• Phosphoric Acid

Welding

Inconel 625 screws are readily weldable with conventional welding processes and this is particularly useful for Inconel 625 weld studs. This alloy is often chosen for its weldibility compared to other highly alloyed nickel-base alloys. Even in welded condition, alloy 625 is also resistant to intergranular corrosion. In addition, postweld heat treatment of the weld is not necessary to maintain corrosion resistance. 

Overview of Chemistry

Inconel 625 screws are a nickel alloy whose strength is derived from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix. This provides alloy 625 strength without the need for precipitation hardening. The high molybdenum content of Inconel 625 makes these screws very resistant to pitting and crevice corrosion, while the niobium acts to stabilize the it against sensitization during welding, subsequently preventing cracking. The core element of nickel provides 625 the ability to prevent chloride ion stress corrosion cracking.

Inconel 625 Screws in Action: Extreme Applications

• Resistant to chloride ions, pitting and crevice corrosion; high corrosion-fatigue strength, high tensile strength make Inconel 625 screws perfect for marine use.
• Nuclear power plants use Inconel 625 screws for reactor core and control rod screws.
• Heat shields, furnaces and gas turbine engines.
• Wide range of temperature and pressure resistance make 625 screws a key component of chemical processing plants.
• It is an ASME approved material of construction under the Boiler and Pressure Vessel Code

Inconel 625 Grades, Chemistry and Specifications

Inconel 625 (alloy 625), UNS N06625, is the workhorse of the Inconel family and is one of the most common grades. This nickel alloy exhibits high creep-rupture strength and is oxidation resistant to 1800°F (982°C). Inconel 625 has excellent resistance to hot seawater, scrubber environments and reducing acids and this alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. 

Inconel 625 Specifications: AMS 5666, AMS 5837, ASME SB 443 Gr 1, ASME SB 446 Gr 1, ASTM B 443 Gr 1, ASTM B 446 Gr 1, EN 2.4856, ISO 15156-3, NACE MR0175-3, UNS N06625, Werkstoff 2.4856

 Mechanical Data

Inconel Corrosion Data

Inconel 625 Sulfuric Acid Iso-Corrosion Curve

Inconel 625 Hydrochloric Acid Iso-Corrosion Curve

Inconel 625 Performance in Phosphoric Acid

Inconel 718 Screws

Inconel 718/Alloy 718 (2.4668) Key Benefits:

• Excellent corrosion resistance at elevated temperatures
• Excellent creep and stress rupture strength, at elevated temperatures to 1300°F (700°C)
• High strength material
• Heat treatments provide tensile strength ranging 185-220ksi
• Inconel 718 datasheet

An age hardened nickel-chromium-based superalloy, Inconel 718 (2.4668) screws are ideal for extreme environments that require oxidation and corrosion resistant screws, even when subjected to pressure and heat. Twice as strong as Inconel 625 screws, 718 screws are renowned for its high yield strength and usability to 1300°F. Often selected by industry for their high temperature strength capabilities, Inconel 718 screws also deliver strength and ductility at cryogenic temperatures.

Also known as alloy 718, Inconel 718 screws are a precipitation hardened (also called age hardened) form of Inconel 625. This heating and quenching process is used to change the alloy’s atomic structure, making it stronger by locking the metal's grain structure in place. Additional strength could be gained by cold working.

Corrosion Resistance

Similar to its 625 counterpart, Inconel 718 bolts offer excellent resistance due to their nickel-chromium content, even combating chloride-ion stress-corrosion cracking.The nickel in alloy 718 helps provide resistance to many inorganic and organic compounds throughout wide ranges of acidity and alkalinity, with the exception of strongly oxidizing compounds. It's chromium content enables it to withstand sulfur compounds and mild oxidizing media, while molybdenum helps prevent pitting. Key corrosion resistance attributes of Inconel 718 include:

• Highly resistant to chloride and sulfide stress corrosion cracking.
• Excellent resistance to H2S, CO2, chloride, and sour gas environments.
• Resistant to aqueous corrosion.
• Provides protection in oil & gas drilling environements at high temperatures.

Thread Creation

Threads can also be rolled or cut in the annealled condition. Once aged hardnend, additional work via rolling or cutting becomes very difficult but can done for certain applications that require the highest strengths possible.

Welding

Known for having outstanding weldibility, Inconel 718 screws can be welded in either the annealled or aged condition. This is partiuclarly useful for applications utilizing weld studs.  Due to its age hardening process, Inconel 718 screws can be welded without hardening or cracking.  Keep in mind that when welding in the aged conition will cause the formation of a softened heat-affected zone. 

Overview of Chemistry

Inconel 718 screws are a nickel-chromium alloy. They contain significant amount of iron, columbium, and molybdenum, along with lesser amounts of aluminum and titanium.

Inconel 718 Screws in Action: Extreme Applications

• Natural gas processing where contaminants such as H2S and CO2 are present
• Aerospace also uses Inconel 718 screws for liquid oxygen turbo-pumps, gas turbine engines and airframe parts
• Down-hole oil shafts and wellhead parts
• Chemical processing
• High temperature applications like steam generators and nuclear pressurized water reactors
• Cryogenic tanks 

 Inconel 718 Grades, Chemistry and Specifications

Inconel 718 (alloy 718), UNS N07718, is the most common grade of the hardenable Inconel nickel alloys. This precipitation-hardened nickel-chromium alloy combines outstanding corrosion resistance and high strength at elevated temperatures. The alloy is a about 2x as strong as Inconel 625 having excellent creep-rupture strength at temperatures to 1300°F (700°C) and can withstand temperatures up to 1800°F (982°C). Inconel 718 is often used in gas turbines, rocket motors, spacecraft, nuclear reactors, pumps, and tooling. 

Inconel 718 Specifications: AMS 5596, AMS 5662, AMS 5663, AMS 5962, AMS 5832, ASME Case 2222-1, ASME SFA 5.14, ASTM B 637, ASTM B 670, EN 2.4668, GE B50TF14, GE B50TF15, UNS N07718, Werkstoff 2.4668

 Mechanical Data

Inconel 718 Heat Treatment Strengths

Inconel Corrosion Data

Inconel 718 Bolts

Inconel 718 / Alloy 718 / 2.4668 Key Benefits:

• Excellent corrosion resistance at elevated temperatures
• Excellent creep and stress rupture strength, at elevated temerpatures to 1300°F (700°C)
• High strength material
• Heat treatments offer tensile strength ranging 185-220ksi
• Inconel 718 datasheet

An age hardened nickel-chromium-based superalloy, Inconel 718 bolts are ideal for extreme environments that require oxidation and corrosion resistant bolts, even when subjected to pressure and heat. Twice as strong as Inconel 625 bolts, 718 bolts are renowned for its high yield strength and usability to 1800°F. Often selected by industry for their high temperature strength capabilities, Inconel 718 bolts also deliver strength and ductility at cryogenic temperatures.

Also known as alloy 718, Inconel 718 bolts are a precipitation hardened (also called age hardened) form of Inconel 625. This heating and quenching process is used to change the alloy’s atomic structure, making it stronger by locking the metal's grain structure in place. Additional strength could be gained by cold working.

Corrosion Resistance

Similar to its 625 counterpart, Inconel 718 bolts offer excellent resistance due to their nickel-chromium content, even combating chloride-ion stress-corrosion cracking.The nickel in alloy 718 helps provide resistance to many inorganic and organic compounds throughout wide ranges of acidity and alkalinity, with the exception of strongly oxidizing compounds. It's chromium content enables it to withstand sulfur compounds and mild oxidizing media, while molybdenum helps prevent pitting. Key corrosion resistance attributes of Inconel 718 include:

• Highly resistant to chloride and sulfide stress corrosion cracking.
• Excellent resistance to H2S, CO2, chloride, and sour gas environments.
• Resistant to aqueous corrosion.
• Provides protection in oil & gas drilling environements at high temperatures.

Thread Creation

Threads can also be rolled or cut in the annealled condition. Once aged hardnend, additional work via rolling or cutting becomes very difficult but can done for certain applications that require the highest strengths possible.

Welding

Known for having outstanding weldibility, Inconel 718 bolts can be welded in either the annealled or aged condition. This is partiuclarly useful for applications utilizing weld studs.  Due to its age hardening process, Inconel 718 bolts can be welded without hardening or cracking.  Keep in mind that when welding in the aged conition will cause the formation of a softened heat-affected zone. 

Overview of Chemistry

Inconel 718 Bolts are a nickel-chromium alloy. They contain significant amount of iron, columbium, and molybdenum, along with lesser amounts of aluminum and titanium.

Inconel 718 bolts in Action: Extreme Applications

• Natural gas processing where contaminants such as H₂S and CO₂ are present
• Aerospace also uses Inconel 718 bolts for liquid oxygen turbo-pumps, gas turbine engines and airframe parts
• Down-hole oil shafts and wellhead parts
• Chemical processing
• High temperature applications like steam generators and nuclear pressurized water reactors
• Cryogenic tanks 

 Inconel 718 (2.4668) Grades, Chemistry and Specifications

Inconel 718 (alloy 718), UNS N07718, EN 2.4668 is the most common grade of the hardenable Inconel nickel alloys. This precipitation-hardened nickel-chromium alloy combines outstanding corrosion resistance and high strength at elevated temperatures. The alloy is a about 2x as strong as Inconel 625 having excellent creep-rupture strength at temperatures to 1300°F (700°C) and can withstand temperatures up to 1800°F (982°C). The strength could be further improved by cold working per AMS 5962 give a min tensile strength of 220ksi. Inconel 718 is often used in gas turbines, rocket motors, spacecraft, nuclear reactors, pumps, and tooling. 

Inconel 718 Specifications: AMS 5596, AMS 5662, AMS 5663, AMS 5832, AMS 5962, ASME Case 2222-1, ASME SFA 5.14, ASTM B 637, ASTM B 670, EN 2.4668, GE B50TF14, GE B50TF15, UNS N07718, Werkstoff 2.4668

 Mechanical Data

Inconel 718 Heat Treatment Strengths

Inconel Corrosion Data

Inconel 625 Bolts

Inconel 625 / Alloy 625 / EN 2.4856 Key Benefits:

• Very good corrosion resistance at elevated temperatures
• High temperature stability up to 2200°F (982°C)
• High strength material with excellent toughness at elevated temperatures
• Inconel 625 datasheet
• Inch and metric sizes (EN 2.4856 DIN 933, DIN 931)

Developed in the 1960’s as a material for steam-lined piping, Inconel® 625 bolts deliver high strength, even at extreme high temperatures from freezing cryogenics to 1800°F.  Also known as Alloy 625, Inconel 625 bolts are renowned for their amazing ability to retain their strength and resist heat, both in and out of corrosive environments. The presence of nickel and chromium make Inconel 625 bolts corrosion, oxidation and carburization resistant. The molybdenum also helps to deliver excellent fatigue strength and resistance to stress, pitting and crevice corrosion cracking even when exposed to chloride ions.

Corrosion Resistance

Due to ability of Inconel 625 bolts to prevent, stress, crevice and pitting corrosion, it is utilized in a diversity of corrosive environments. In mild applications such as atmosphere, fresh or salt water, neutral salts and alkaline media is is almost completely resistant. In more severe situations the nickel and chromium content provides resistance to oxidizing chemicals. Inconel 625 bolts are also resistant to nonoxidizing environments. Better understand Inconel 625's corrosion resistance to:

• Sulfuric Acid
• Hydrochloric Acid
• Phosphoric Acid

Welding

Inconel 625 bolts are readily weldable with conventional welding processes and this is particularly useful for Inconel 625 weld studs. This alloy is often chosen for its weldibility compared to other highly alloyed nickel-base alloys. Even in welded condition, alloy 625 is also resistant to intergranular corrosion. In addition, postweld heat treatment of the weld is not necessary to maintain corrosion resistance. 

Overview of Chemistry

Inconel 625 bolts are a nickel alloy whose strength is derived from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix. This provides alloy 625 strength without the need for precipitation hardening. The high molybdenum content of Inconel 625 makes these bolts very resistant to pitting and crevice corrosion, while the niobium acts to stabilize the it against sensitization during welding, subsequently preventing cracking. The core element of nickel provides 625 the ability to prevent chloride ion stress corrosion cracking.

Inconel 625 Bolts in Action: Extreme Applications

• Resistant to chloride ions, pitting and crevice corrosion; high corrosion-fatigue strength, high tensile strength make Inconel 625 bolts perfect for marine use.
• Nuclear power plants use Inconel 625 bolts for reactor core and control rod bolts.
• Heat shields, furnaces and gas turbine engines.
• Wide range of temperature and pressure resistance make 625 bolts a key component of chemical processing plants.
• It is an ASME approved material of construction under the Boiler and Pressure Vessel Code

Inconel 625 Grades, Chemistry and Specifications

Inconel 625 (alloy 625), UNS N06625, is the workhorse of the Inconel family and is one of the most common grades. This nickel alloy exhibits high creep-rupture strength and is oxidation resistant to 1800°F (982°C). Inconel 625 has excellent resistance to hot seawater, scrubber environments and reducing acids and this alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. 

Inconel 625 Specifications: AMS 5666, AMS 5837, ASME SB 443 Gr 1, ASME SB 446 Gr 1, ASTM B 443 Gr 1, ASTM B 446 Gr 1, EN 2.4856, ISO 15156-3, NACE MR0175-3, UNS N06625, Werkstoff 2.4856

 Mechanical Data

Inconel Corrosion Data

Inconel 625 Sulfuric Acid Iso-Corrosion Curve

Inconel 625 Hydrochloric Acid Iso-Corrosion Curve

Inconel 625 Performance in Phosphoric Acid