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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 800H is used in chemical and petrochemical processing, power plants for super-heater and reheater tubing, industrial furnaces and heat-treating equipment.
Main specifications:
| Chinese | UNS | Werkstoff Nr. | 
| NS112 | N08810 | 1.4958 | 
| 800HT | N08811 | 1.4959 | 
Chemical composition under ASTM B408-2016 standard:
| Grade | chemical composition,% | ||||||||||
| Ni | Cr | Fe | Mn | C | Cu | Si | S | Al | Ti | Al+Ti | |
| Alloy N08810 | 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 | 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 | 
Fe element shall be determined arithmetically by difference.
wire,rod,forging, bar,strip,sheet/plate,tube/pipe.
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 | 
|  | Alloy 800H document: | 
| alloy800h.pdf |