Title:
HIGH-STRENGTH PIPELINE RESISTANT TO ALUMINUM SULFATE CORROSION AND FABRICATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/143290
Kind Code:
A1
Abstract:
Disclosed is a pipeline. The pipeline has, in the thickness direction, a corrosion-resistant layer and a base layer. The corrosion-resistant layer is at least located on an inner wall of the pipeline, and the corrosion-resistant layer, in addition to Fe and inevitable impurities, further contains the following chemical elements in percentage by weight: 0 < C ≤ 0.08%; Si: 0.3-0.6%; Mn: 0.5-2.0%; Ni: 11.00-13.00%; Cr: 16.50-18.00%; Mo: 2.00-3.00%; N: 0.02-0.2%; and Cu: 0.01-0.3%. Cr, Mo, N, and Cu satisfy the following inequality: Cr + 3.3 × Mo + 16 × N + 10 × Cu ≥ 26.0%. Correspondingly, further disclosed is a method for fabricating the pipeline, comprising the steps of: (1) preparing a corrosion-resistant layer slab and a base layer slab; (2) assembling the corrosion-resistant layer slab and the base layer slab, and obtaining a composite slab; (3) heating and rolling: heating the composite slab at a temperature of 1150-1200°C, the total rolling reduction rate being not lower than 90%, and the final rolling temperature being not lower than 920°C; (4) coiling: after water cooling, coiling at a temperature of 500-620°C, and obtaining a hot-rolled coil; (5) performing surface treatment on the hot-rolled coil; and (6) preparing a pipe.
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Inventors:
YAN BO (CN)
JIAO SIHAI (CN)
WANG ZHIYU (CN)
LI ZHANJIE (CN)
JIAO SIHAI (CN)
WANG ZHIYU (CN)
LI ZHANJIE (CN)
Application Number:
PCT/CN2023/072827
Publication Date:
August 03, 2023
Filing Date:
January 18, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
B21B1/38; C22C38/58; B32B1/08; B32B15/01; B32B15/18; C21D1/26; C21D8/02; C22C38/42; C22C38/44
Foreign References:
| CN112877589A | 2021-06-01 | |||
| CN108116006A | 2018-06-05 | |||
| CN113106327A | 2021-07-13 | |||
| CN109108071A | 2019-01-01 | |||
| CN112874059A | 2021-06-01 | |||
| JP2013255936A | 2013-12-26 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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