SY 718
SY 718
This document provides technical specifications and applications for a precipitation-hardenable Ni-Cr alloy, known for its high strength up to 700°C, good corrosion resistance, excellent weldability, and exceptional creep-rupture strength at high temperatures. The alloy is amagnetic and used in various industries including chemical, power plants, oil and gas, and aeronautics.
The alloy, identified as UNS N07718 or EN NiCr19FeNb W 2.4668, consists of 50-55% Ni, 17-21% Cr, 2.8-3.3% Mo, 4.75-5.5% Nb, with additional elements like Ti and Al, and the balance being Fe.
The alloy guarantees stress-corrosion cracking resistance according to NACE MR0175 standards.
The standard heat treatment involves heating between 941°C to 1010°C followed by water quenching and age treatment if required.
The alloy is used in chemical industries, safety parts, power plants, oil and gas, petrochemistry, and aeronautics. Relevant standards include ASTM B637, NACE MR0175, and AMS 5662.
- Round Bars: Available in diameters from Ø 4mm to Ø 250mm, with processes including cold bars, hot-rolled bars, and forged bars. Surface conditions vary from raw to polished, with specific tolerances and straightness requirements.
- Square Bars: Available in sizes from 80x80mm to 250x250mm, processed as bloomed or forged, with ground surface conditions and specific tolerances.
Products come with a Certificate 10204-3.1, ensuring chemical composition according to relevant standards. Ultrasonic testing is conducted for bars intended for hot transformation.
The data provided are indicative and correspond to standard products. Specific requirements are subject to discussion and approval by Aperam Alloys Imphy.
Catalog excerpts
Bar Corrosion application It is a precipitation-hardenable Ni-Cr alloy with a significant amount of Fe, Nb and Mo and containing lesser amounts of Al and Ti. This alloy combines excellent high strength up to 700°C with good corrosion resistance and excellent weldability. Exceptionnal creep-rupture strength at high temperature. It is amagnetic. 1. Chemical content 3. Heat-treatment In standard our heat treatment is : 941°C to 1010°C + WQ followed by age treatment if required. 4. Applications Stress-Corrosion cracking resistance according to NACE MR0175 is guaranteed. • Chemical industries • Safety parts • Power plant (gas turbine, ...) • Oil and gas, petrochemistry • Aeronautic,. Standards related to these applications : ASTM B637, NACE MR0175, AMS 5662 5. Shapes - Tolerances - Destinations Round bars Aperam Alloys Imphy Innovatis 5, rue Luigi Cherubini F- 93212 St Denis
Open the catalog to page 1
5. Shapes - Tolerances - Destinations Square bars Other shapes : Please consult us 6. Certificate Certificate 10204-3.1 Chemical composition according to relevant standards. Bars for hot-transformation : Ultrasonic test according to the norm EN10308 Bars for other applications : Condition and tests according to specified standard The data enclosed in this document are only given as indicative values and correspond to our standard product. Different specific requirement are subject to discussion and formal approval by Aperam Alloys Imphy. For further information or special request, please contact...
Open the catalog to page 2All APERAM ALLOYS IMPHY catalogs and technical brochures
AFK® 181 Page
AFK® 11 Page
NICRIMPHY 6001 Page
Superimphy®6258 Pages
Welding Alloys Wire Rods2 Pages
