http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-104404561-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23G3-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B24B29-08 |
| filingDate | 2014-12-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2017-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2017-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-104404561-B |
| titleOfInvention | Method for treating inner pit defect inside continuous rolling carbon steel tube or low-alloy steel tube |
| abstract | The invention discloses a method for treating inner pit defects inside a continuous rolling carbon steel tube or a low-alloy steel tube. The method comprises the following steps: pickling by using an acid liquid which is prepared from the following components in parts by volume for the first time: 10-15 parts of 33% technical hydrochloric acid, 1-3 parts of nitric acid and 20 parts of water, subsequently performing grinding wheel polishing on the continuous rolling carbon steel tube with inner pit defects or inner pit areas of the low-alloy steel tube, and further pickling for a second time by using another acid liquid which is prepared from the following components in parts by volume: 10-15 parts of 33% technical hydrochloric acid and 20 parts of water, wherein the concentration of FeCl2 in the acid liquids for pickling is controlled to be 35-75g/L each time. By adopting the method of twice pickling and once grinding wheel polishing, the inner pit defects distributed in the inner surfaces of the continuous rolling carbon steel tube and the low-alloy steel tube are eliminated, the quality of the inner surfaces of cold-drawn steel tubes is improved, and the purpose of completely eliminating oxidized iron skin on inner surfaces of steel tubes is achieved. |
| priorityDate | 2014-12-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 20.