Alloy 800H/800HT UNS N08810, UNS N08811 W. Nr. 1.4958, 1.4959,

Alloy 800H/800HT UNS N08810, UNS N08811 W. Nr. 1.4958, 1.4959​ application :

UNS N08800 Heat Resistant Super Alloy INCOLOY Alloy 800 Technical datasheet

Limiting Chemical Compositions, %, for INCOLOY alloys 800, 800H, and 800HT

Note: These alloys can be specified to more restrictive compositions on a specific order basis.

Hardness and Tensile Properties of INCOLOY alloy 800 at High Temperatures

Mechanical Properties

INCOLOY alloy 800 has high mechanical strength over a broad temperature range. In general, alloy 800 is used for its strength characteristics at service temperatures up to about 1500°F (816°C). At those temperatures, equipment design is usually based on tensile properties. For applications that require high creep or rupture strength, INCOLOY alloys 800H and 800HT are used.

Tensile Properties

INCOLOY alloy 800 exhibits high tensile properties at room and elevated temperatures. Figures 2 and 3 show tensile properties at temperatures to 1500°F (815°C) of hot-rolled rod in the as-rolled and the annealed conditions. Tensile properties at room temperature and from 1200°F (650°C) to 1800°F (980°C) of as-extruded tubing are given in Table 6.

Table 6 - Tensile Properties of INCOLOY alloy 800 As-extruded Tubinga

Cold work substantially increases the tensile properties of the alloy. Properties of cold-drawn rod in the as-drawn condition are given in Table 7.

High-temperature hardness and tensile properties of annealed and hot-rolled material are shown in Table 8.

Table 7 - Tensile Properties of INCOLOY alloy 800 Cold-Drawn Roda

Corrosion Resistance

The high nickel and chromium content of Alloys 800H and 800HT generally means they will have very similar aqueous corrosion resistance. The alloys have corrosion resistance that is comparable to 304 when used in nitric and organic acid service. The alloys should not be used in sulfuric acid service. They are subject to chromium carbide precipitation if in service for prolonged exposure in the 1000 – 1400°F (538 – 760°C) temperature range.

Since Alloys 800H and 800HT were developed primarily for high- temperature strength, corrosive environments to which these grades are exposed normally involve high temperature reactions such as oxidation and carburization.

Fabrication Data

Alloys 800H and 800HT can be easily welded and processed by standard shop fabrication practices. However, because of the high strength of the alloys, they require higher powered process equipment than standard austenitic stainless steels.

Hot Forming

The hot-working temperature range for Alloy 800H and 800HT is

1740 – 2190°F (950 – 1200°C) if deformation is 5 percent or greater. If the degree of hot deformation is less than 5 percent a hot working temperature range between 1560 – 1920°F (850 – 1050°C) is recommended. If the hot working metal temperature falls below the minimum working temperature, the piece must be re-heated. The alloys should be water quenched or rapid air cooled through the temperature range of 1000 – 1400°F (540 – 760°C). Alloys 800H and 800HT require solution annealing after hot working to ensure optimal creep resistance and properties.

Cold Forming

The alloys should be in the annealed condition prior to cold forming. Work hardening rates are higher than the austenitic stainless steels. This should be taken into account when selecting process equipment. An intermediate heat treatment may be necessary with a high degree of cold working or with more than 10 percent deformation.

Welding

Alloys 800H and 800HT can be readily welded by most standard processes including GTAW (TIG), PLASMA, GMAW (MIG/MAG), and SMAW (MMA). The

material should be in the solution-annealed condition, and free from grease, markings or scale. A post weld heat treatment is not necessary. Brushing with a stainless steel wire brush after welding will remove the heat tint and produce a surface area that does not require additional pickling.

Machining

Alloys 800H and 800HT should preferably be machined in the annealed condition. Since the alloys are prone to work–hardening, only low cutting speeds should be used and the cutting tool should be engaged at all times. Adequate cut depth is necessary to assure avoiding contact with the

previously formed work-hardened zone.

General Q and A

Q: Would you provide samples For free?

A: Yes. with on stock specification We provide samples For Free. Freight charge collect

Q: What information should i provide to source for the right products?

A: Material grade, width, thickness, coating and Purchase quantity, Expected lead time, etc

Q: What are the shipping ports?

A: Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you

can choose other ports according to your needs.

Q: About product prices?

A: Prices vary from period to period due to cyclical changes in the price of raw materials.

Q: How long does your delivery time take?

A: In general, our delivery time is within 5-45 days, and may be delayed if the demand is extremely

large or special circumstances occur.

Q: Can I visit your location?

A: Of course, we welcome customers from all over the world to visit our factory. However, some

of the plants are not open to the public.

Q: Does the product have quality inspection before loading?

A: Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed. We provide All Original Mill test certificate and support third party inspection.

Q: How to pack the products?

A: The inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation

wooden pallet. It can effectively protect products from corrosion during ocean transportation.

Q: What is your working time?

A: In general, our online service time is Beijing time: 8:00-22:00, after 22:00,

we will reply to your inquiry during the next working day.