Compared of seamless steel pipe and ERW steel pipe 2

8, impact test

Several times due to the impact toughness of ERW steel pipe to seamless steel tube, the impact toughness of welds is the key of ERW steel pipe, by controlling the impurity content of raw material, slitting, molding of edge burr height and direction form, Angle of welding, welding speed, heating power and frequency, welding extrusion amount, intermediate frequency withdraws from the depth, temperature and air cooling length of process parameters to ensure the weld to that of the parent metal of more than 60%, further optimization, such as can realize welding seam impact energy is close to the parent metal, so as to achieve performance as seamlessly.

9, the blasting test

ERW steel pipe blasting test performance is much higher than standard requirements, mainly is the result of ERW steel pipe wall thickness uniform high uniformity and outside diameter size.

10, straightness,

ERW steel pipe belongs to cold working, and under the conditions of reducing on-line straightening, plus is infinite times ruler, so the straightness is good; Seamless steel tube in the condition of plastic molding and haploid feet (rolling for 3 ~ 4 times feet) pipe straightness is relatively difficult to control.

11, appearance

Seamless steel tube used in billet surface defects cannot be eliminated by hot rolling process, only in the completion of the finished product, burnish drops defects; For screw hole left behind, in the process of reduction of wall, can only get part to eliminate. ERW welded steel pipe with hot rolled plate as raw material, rolled plate surface quality is ERW steel tube surface quality, and the surface quality of hot-rolled coil plate is easy to control and the quality is higher, so the surface quality of the ERW steel tube is far better than that of seamless steel tube.

12, thousands of meters of penetration casing steel consumption

Uniform of ERW steel pipe wall thickness, the wall thickness tolerance is negligible, and seamless steel tube wall thickness difference of control accuracy limit for plus or minus 5% t, general control in the plus or minus 5 ~ 10% t. In order to guarantee the minimum wall thickness can meet the standard requirements and the use of performance, only the appropriate increase wall thickness to solve. So in the same specification, same weight of casing, 5 ~ 10% longer than carbon steel pipe, and even more, this reduces the thousands of meters of penetration casing steel consumption 5 ~ 10%. Even under the same price, ERW casing effect for the user to save the five to 10% of the purchasing cost.

9-5/8 "x 8.94 mm casing, for example, every meters can save 26.8 ~ 53.6 tons, an average savings of $300000.

In 2007, my company's major foreign users is given priority to with Russia's state oil company, oil production area distribution in Siberia in Russia. J55 steel grade oil, casing well depth of 2400 m or so. N80 steel grade oil, casing well depth of 4800 m or so. Part belongs to the production areas and high sulfur, low temperature well geological conditions, the product has no any quality problem happens.

2008 foreign users are mainly composed of Texas oil fields and Russian oil field. Mainly in domestic oilfield, huabei oilfield, daqing oilfield is given priority to. Product scope mainly J55 and N80 steel grade Φ 73.02 mm, 139.7 mm Φ series oil and casing. P110 steel grade slant ladder type fastener Φ 139.7 x 7.72 mm casing in the oilfield using Texas also get good effect, the P110 steel grade slant ladder buckle type casing under the well depth of 5400 m.