http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2199011-A2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c5d961b7b0788125a1a21ac598c5f60b |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C8-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C8-26 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C8-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C8-26 |
| filingDate | 1972-09-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1974-04-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | FR-2199011-A2 |
| titleOfInvention | Process of nitriding iron and iron alloys in gaseous media yielding nitrogen. |
| abstract | Nitriding of esp. non- or low-alloyed steels,esp. constructional steels, e.g. carburising and heat-treatable steels, in an NH3 gas stream is carried out in 2 temp. steps. The first is effected above the alpha-gamma-transformation in Fe-N2 system, pref. at 650 degrees C, for 2-8 hrs. The second takes place, pref. after slow cooling, below the alpha-gamma-transformation, pref. at 570 degrees C for 2-4 hrs., pref. with addn. of a C-yielding material,esp. MeNH2, in 5-20 vol.% concn. w.r.t. NH3 amt. fed. Residual NH3 content of furnace atmos. is >10% in first- and 45-60% in second temp. step. Fatigue strength of non-alloyed steels may be raised by accelerating cooling rate from 2nd step, by raised gas flow, esp. with N2. |
| priorityDate | 1972-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 16.