1. Brief introduction:

   Alloy 800H and alloy 800HT are Ni-Fe-Cr alloys that have the same basic composition as alloy 800 but with significantely higher creep-rupture strength,normally used above  approximately 1100℉（593℃）where resistance to creep and stress rupture is required.

   Alloy 800HT is used in chemical and petrochemical processing, power plants for super-heater and reheater tubing, industrial furnaces and heat-treating equipment.

    

2. Main specifications:
   

   Chinese	UNS	Werkstoff Nr.
   NS112	N08810	1.4958
   800HT	N08811	1.4959

    

3. Chemical composition under ASTM B408-2016 standard:

   Alloy N08810 chemical composition,%
   Ni	Cr	Fe	Mn	C	Cu	Si	S	Al	Ti	Al+Ti
   30.0-35.0	19.0-23.0	≥39.5	≤1.5	0.05-0.1	≤0.75	≤1.0	≤0.015	0.15-0.6	0.15-0.6	/
   Alloy N08811 Alloy N08810 chemical composition,%
   Ni	Cr	Fe	Mn	C	Cu	Si	S	Al	Ti	Al+Ti
   30.0-35.0	19.0-23.0	≥39.5	≤1.5	0.06-0.1	≤0.75	≤1.0	≤0.015	0.15-0.6	0.15-0.6	0.85-1.2

   
   

4. Fe element shall be determined arithmetically by difference.

   wire,rod,forging, bar,strip,sheet/plate,tube/pipe.

    

5. Main produce standards:
   

   Wire,Rod, Bar	Forging	Plate/Sheet/Strip	Seamless Tube/Pipe
   ASTM B408 ASME SB408	ASTM B564 ASME SB564	ASTM B409 ASME SB409  AMS 5871	ASTM B163 ASME SB163 ASTM B407 ASME SB407

   
   

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