Alloy 800 Plate

INCOLOY Alloy 800, Alloy 800H, Alloy 800HT Plate

INCOLOY Alloy 800 Plate (UNS N08800/W. Nr. 1.4876) is a widely used material for the construction of equipment requiring corrosion resistance, heat resistance, strength, and stability for service up to 1500°F (816°C).

1. This material, INCOLOY alloy 800 (UNS N08800/W. Nr. 1.4876), is extensively employed in the construction of equipment that needs to withstand corrosion, high temperatures, strong forces, and remain stable enough to function optimally at temperatures as high as 1500°F (816°C).

Alloy 800 Plate offers general corrosion resistance to many aqueous media and, by virtue of its content of nickel, resists stress corrosion cracking.

2. Alloy 800 provides a reliable barrier against corrosion in diverse aqueous environments, and its high nickel content endows it with exceptional resistance to stress corrosion cracking. At elevated temperatures, it offers resistance to oxidation, carburization, and sulfidation along with rupture and creep strength.

3. At high temperatures, it has the ability to resist oxidation, carburization, and sulfidation, while maintaining its durability against rupture and creep strength.

For applications requiring greater resistance to stress rupture and creep, especially at temperatures above 1500°F (816°C), INCOLOY alloys 800H and 800HT are used.

4. INCOLOY Alloy 800 Plate and 800HT are utilized in applications where superior resistance to stress rupture and creep is necessary, particularly in temperatures exceeding 1500°F (816°C).

The chromium in the alloy imparts both aqueous and heat resistance.

5. The inclusion of chromium in the alloy provides both resistance to heat and aqueous environments. Iron provides resistance to internal oxidation.

6. Iron gives protection against being oxidized from within. The nickel content maintains a ductile, austenitic structure.

7. The presence of nickel ensures a malleable and austenitic structure is maintained. Thus, alloy 800 is readily formed, welded, and machined.

8. As a result, alloy 800 can be easily shaped, welded, and processed by machines. It had been known for some time that higher carbon alloy 800 had higher creep and rupture properties than low-carbon material.

9. It had been previously established that alloys containing higher amounts of carbon, such as alloy 800, exhibit superior creep and rupture properties compared to low-carbon variants. For that reason, Special Metals had melted to a carbon range of 0.05 to 0.10% except for special orders where customers specified a lower carbon content.

10. Special Metals typically maintain a carbon range of 0.05 to 0.10% in their products, unless customized orders from customers specifically require a lower carbon content.

The carbon range of 0.05 to 0.10% is within the ASTM and ASME specification limits for alloy 800 and is in the upper portion of that range.

11. The carbon content of alloy 800 falls within both the ASTM and ASME specification limits, with a range typically towards the higher end at 0.05 to 0.10%. Special Metals generated data for this material and presented them to the ASME Code.12.Special Metals collected and provided material data to the ASME Code for this particular product.

The Code approved higher design stresses for Section I and Divisions 1 and 2 of Section VIII, which appeared in Code Case 1325- 7.

13. The Code Case 1325-7 included an approval of increased design stresses for Section I and Divisions 1 and 2 of Section VIII. Note that alloy 800H required not only a carbon range of 0.05 to 0.10% but also an average grain size of ASTM 5, or coarser.

14. It should be noted that for alloy 800H, meeting the carbon range of 0.05 to 0.10% is not enough, as it also requires an ASTM 5 average or coarser grain size.

We knew the importance of maintaining the aluminum and titanium contents in the upper portion of the specified material range.

15. We were aware of the significance of keeping the levels of aluminum and titanium within the higher end of the specified material range.

This resulted in higher creep and stress rupture properties than competitive alloy 800H.

16. This led to improved resistance to creep and stress rupture compared to alternative alloy 800H.

Therefore, to maintain higher allowable design stresses, the company introduced a variation of INCOLOY alloy 800H which is called INCOLOY alloy 800HT (UNS N08811).

17. As a solution for maintaining higher allowable design stresses, the company implemented a modified version of INCOLOY alloy 800H known as INCOLOY alloy 800HT (UNS N08811). INCOLOY alloy 800HT has a restricted chemistry, within the limits of alloy 800H, and requires a heat treatment of 2100°F (1149°C) minimum.

18. The chemical composition of INCOLOY alloy 800HT is limited to within the boundaries of alloy 800H, and it necessitates a minimum heat treatment of 2100°F (1149°C).

The carbon is 0.06 to 0.10% (alloy 800H is 0.05 to 0.10%), the Al + Ti is 0.85 to 1.20% (alloy 800H is 0.30 to 1.20% Al + Ti)

19. The carbon content of the material ranges from 0.06% to 0.10%, while alloy 800H has a carbon content of 0.05% to 0.10%. Additionally, the material contains 0.85% to 1.20% of Al + Ti, while alloy 800H contains 0.30% to 1.20% of Al + Ti.

 

 

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