Certified Company
DNV&ABSCertified Company
ISO 9001:2008R&D Production
In China
STR661
STR661 material is KS D 3731 (2002) Heat - resisting steel bars KS D 3732 (2002) Heat - resisting steel plates and sheets Heat - resisting steel plates and sheets.
Chemical composition of STR661, STR661 mechanical properties, STR661 datasheet, STR661 equivalent grade, Heat treatment and temperature process of STR661.
STR661 property sheet
STR661 Spec.
| KS D 3731 (2002) Heat - resisting steel bars |
| KS D 3732 (2002) Heat - resisting steel plates and sheets |
Related Materials
| STR661 |
Chemical Composition of STR661
| C: | 0.08 | 0.16 |
| Si: | Max | 1.00 |
| Mn: | 1.00 | 2.00 |
| P: | Max | 0.04 |
| S: | Max | 0.03 |
| Cr: | 20.00 | 22.50 |
| Ni: | 19.00 | 21.00 |
| Mo: | 2.50 | 3.50 |
| N: | 0.10 | 0.20 |
| Co: | 18.50 | 21.00 |
| W: | 2.00 | 3.00 |
| Nb: | 0.75 | 1.25 |
Mechanical Properties of STR661
| Rp0.2 (MPa) | 295 (≥) |
| Rm (MPa) | 965 (≥) |
| AKV (J) | 43 |
| A (%) | 42 |
| Z (%) | 32 |
| Hardness | HBW 233 |
STR661 shape and dimensions
| STR661 Round bar: | 1mm-800mm |
| STR661 Square bar: | 10mm * 10mm-600mm *600mm |
| STR661 Flat bar: | Thickness:8mm-800mm Width:10mm to 1500mm |
| STR661 Sheet or Plate: | Thickness:3mm-80mm Width:1.5mm to 1500mm |
| STR661 Strip or Coil: | Thickness:0.1mm-3mm Width:1.5mm-1500mm |
| STR661 Forgings: | Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes |
©Longhai Special Steel 2025
