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Nickel Alloy Steel Pipe

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Incoloy 800HT (UNS N08811/W.Nr.1.4959) steel pipes and tubes

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Incoloy 800HT (UNS N08811/W.Nr.1.4959) steel pipes and tubes

Incoloy 800HT Chemical composition:

Alloy	%	Ni	Cr	Fe	C	Mn	Si	Cu	S	Al	Ti
800	Min.	30	19							0.15	0.15
800	Max.	35	23	balance	0.10	1.5	1	0.75	0.015	0.60	0.60
800H	Min.	30	19		0.05					0.15	0.15
800H	Max.	35	23	balance	0.10	1.5	1	0.75	0.015	0.60	0.60
800HT	Min.	30	19		0.06					0.15	0.15
	Max.	35	23	balance	0.10	1.5	1	0.75	0.015	0.60	0.60
	AI+Ti: 0.85-1.20

Incoloy 800HT Physical properties:

Density	8.0 g/cm³
Melting point	1350-1400 °C

Incoloy 800HT Alloy m inimum mechanical properties in the room temperature

Alloy	Tensile strength Rm N/mm²	Yield strength R P0. 2N/mm²	Elongation A 5 %
800	500	210	35
800H	450	180	35

800H Characteristic as below:
1.Excellent corrosion resistance in the high temperature at 500°C in the water medium.
2.Good stress corrosion resistance property.
3.Good machining

Incoloy 800HT Metallurgical structure:

800H is face-centered cubic lattice structure. very low carbon centent and increased Ti:C rate

improve the stability of the structure, anti-allergy , and anti-intergranular corrosion. Low temperature annealing of 950°C ensure the fine grain structure.

Incoloy 800HT Corrosion resistance:
800H can not be corroded in many kinds of media. Its high nickel content made it have good stress corrosion resistance cracking property in the water corrosion condition.High Chromium content made it can better resist pitting and crevice corrosion cracking. This alloy can resist nitric acid and organic acid corrosion, but it is not so fine in the sulfuric acid and hydrochloric acid.

800H not only good corrosion resistance in both oxidation and non-oxidizing salt, maybe a little pitting in halide, but also very good corrosion resistance property in the mixture of water,smoke, steam,air and carbon dioxide.

Incoloy 800HT Application range and field:
1.Nitrate condenser---Corrosion resistance of nitrc acid
2.Steam heating pipes--Very good mechanical property
3.Heat up element tube--Very good mechanical property

For the application of up to 500°C enviornment, alloy supply state change to annealing.

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