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Sanicro® 925 (UNS N09925) is an age-hardened version of Sanicro® 825 that will offer roughly four times the strength of this entry-level nickel alloy. We are currently testing and qualifying this bar and hollow bar with our technical partners and plan to make it available in 2022-23. Please stay tuned for further details.

Sanicro® 718 (UNS N07718) is our forthcoming new grade of bar and hollow bar that will offer significantly higher strength and hardness properties than all other Sanicro grades. This grade is now undergoing rigorous testing with our technical partners and will be introduced in 2022-23, so please stay tuned.

The chemical composition of Sanicro® 825 has been optimized by our R&D team to give unique properties to the bar and hollow bar. By adding slightly more Cr and Mo, for example, we’ve been able to secure a Pitting Equivalent Number of PRE >32.8, which beats the industry standard. With nickel levels always above 40%, the product is virtually immune to stress corrosion cracking (SCC), compared to AISI 316L and AISI 904L (see diagram).

Many of our customers, particularly in the energy sector, have requested a machining material that is “immune” to wet corrosive conditions. So, we are introducing Sanicro® 625 (ASTM "Grade 1" in the soft annealed condition). Our R&D team optimized the chemical composition to achieve maximum strength – derived from a stiffening effect of 8.5% molybdenum and 3.5% niobium on its nickel-chromium matrix. They then added a full 62% nickel content, making it virtually immune to stress corrosion cracking. In short, a safe bet for the most challenging of environments.

By using hollow bar, machining costs are reduced by a least 50%. This is due to reduced need for drilling, boring and other fabrication steps. Whether it’s a flange, valve or fitting, you will arrive at net shape a lot faster. We can then provide recommendations for optimal cutting tools and speeds through Sandvik Coromant, our world-leading machining business area.

We are obsessive about quality. Before leaving our mill, Sanicro® 625 bar must undergo a battery of tests to meet the most rigorous standards for tensile strength, hardness, impact strength, intergranular corrosion and grain size. To avoid intergranular corrosion, for example, we stabilize the material with 3.5% niobium and use an extra-low carbon content ≤0.025%. Then we use the “Streicher test” with sulfuric acid for 120 hours according to ASTM G-28 Method A – just one example of how we secure the very highest level of quality of our nickel alloys.

Intergranular corrosion can be a risk during welding. To eliminate this issue, Sanicro® 825 is titanium-stabilized to give high structural stability and eliminate the formation of intermetallic phases at elevated temperatures. Even at the heaviest sizes, Sanicro® 825 can be welded without the risk of carbide precipitation, causing intergranular corrosion. We recommend tungsten arc welding (TIG/GTAW9).

Sanicro® 625 is a versatile alloy that can be used in a wide range of industries and applications. Recently, we’ve noted a surge of interest for renewable energy applications, such as geothermal, solar and waste heat recovery – applications where molten salts, minerals and other deposits can create corrosion issues. Here, our usage of 84% recycled steel and fossil-free energy in a circular production process may support your overall sustainability goals.