Title:
MANUFACTURING TECHNIQUE FOR METAL BASE OF CRUDE OIL CASING PIPE
Document Type and Number:
WIPO Patent Application WO/2018/006484
Kind Code:
A1
Abstract:
A manufacturing technique for a metal base of a crude oil casing pipe for addressing an issue in which an alloy of the prior art cannot meet both cost and strength requirements at the same time. The technique comprises: step 1: melting a pig iron in a furnace to form an iron base, then performing desulfurization, deoxygenation, and dephosphorization to reduce sulfur content to 0.02% or less and phosphorus content to 0.03% or less in the pig iron; step 2: adding and homogeneously mixing Mn, Cu, and N into the iron base and heat to a molten state, then keeping the materials in the molten state for 1-2 hours before adding and homogeneously mixing Si, Cr, and C, holding the temperature at 800-1100°C for at least 2 hours, then heating at a rate of 5-10°C/min to 1200-1250°C and holding the temperature for at least 2 hours, then performing constant temperature casting at a temperature of 800-850°C; step 3: after casting, perform rapid cooling to below 200°C; and step 4: holding the temperature after cooling, then performing quenching and tempering followed by processing to obtain a final product. The method can ensure high strength and hardness at a low cost, and can effectively improve resistance against acid corrosion.
More Like This:
Inventors:
HE CHANGMING (CN)
Application Number:
PCT/CN2016/097429
Publication Date:
January 11, 2018
Filing Date:
August 30, 2016
Export Citation:
Assignee:
SICHUAN XINGZHI ZHIHUI INTELLECTUAL PROPERTY OPERATION CO LTD (CN)
International Classes:
C22C38/18; C21D9/08; C22C38/16
Foreign References:
| CN103725965A | 2014-04-16 | |||
| US20030136476A1 | 2003-07-24 | |||
| CN101845939A | 2010-09-29 | |||
| JP2002363690A | 2002-12-18 | |||
| CN102615476A | 2012-08-01 | |||
| CN101186994A | 2008-05-28 | |||
| JP2010084171A | 2010-04-15 |
Attorney, Agent or Firm:
CHENGDU XINGZHI PATENT AGENCY (ORDINARY PARTNERSHIP) (CN)
Download PDF: