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Preparation method for welded steel pipe for boiler

A technology for welding steel pipes and boilers, which is applied in the field of preparing welded steel pipes for boilers, and achieves the effects of high internal and external surface quality, easy operation and good product quality.

Inactive Publication Date: 2015-04-01
JIANGSU CHANGSHU HUANTONG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention is to provide a method for preparing welded steel pipes for boilers, which can solve the deficiencies in the preparation of existing welded steel pipes

Method used

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Examples

Experimental program
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preparation example Construction

[0012] A method for preparing welded steel pipes for boilers, comprising the following steps: billet anti-rolling, slitting, forming, welding, deburring, weld heat treatment, sizing, non-oxidizing heat treatment, shaping, flaw detection, cutting, cutting and flattening, coating layers, packaging;

[0013] (1) Billet steel coil: the billet is low-carbon steel, and its composition includes: C 0.11, Si 0.08, Mn 0.45, P≤0.01, S≤0.002, Cr 0.55, Ni 0.03, Nb 0.21, Cu 0.25, Al 0.03 , the rest are Fe and non-metallic impurities; place the above steel billet on the uncoiler for uncoiling;

[0014] (2) Slitting: After slitting, cut off the edge of the billet by 2 to 3mm to prevent the edge of the billet from being damaged during the slitting and lifting process, resulting in some tiny cracks and indentations that cannot be seen clearly with the naked eye, causing safety hazards;

[0015] (3) Forming: through multi-pass forming die extrusion, the steel billet roll is extruded into a tubu...

Embodiment 1

[0028] Process welded steel pipes for boilers with an outer diameter of 51.5mm and a thickness of 3.15mm

[0029] (1) Billet steel coil: low-carbon steel billet with a width of 230mm and a thickness of 3.15mm is selected, and its composition includes: C 0.11, Si 0.08, Mn 0.45, P≤0.01, S≤0.002, Cr 0.55, Ni 0.03, Nb 0.21 , Cu 0.25, Al 0.03, and the rest are Fe and non-metallic impurities; place the above billet on the uncoiler for uncoiling;

[0030] (2) Longitudinal cutting: cut off the edge of the billet by 2 to 3 mm during longitudinal cutting;

[0031] (3) Forming: On the pipe making machine, it is formed into a pipe shape through a double-radius hole forming die, and a straight line weld is left;

[0032] (4) Welding: The welding temperature is 1480°C, and the welding pressure is 32.5MPa;

[0033] (5) Deburring: Use a special disc cutter to remove the burrs inside and outside the welded steel pipe, and the residual height after removal is 0.05mm;

[0034] (6) Weld seam h...

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Abstract

The invention discloses a preparation method for a welded steel pipe for a boiler. The preparation method for the welded steel pipe for the boiler includes steps of steel billet winding prevention, longitudinal shearing, forming, welding, burr removing, weld heat treating, sizing, non-oxidizing heat treatment, shaping, flaw detection, cutting, head cutting and truncation, coating and packaging. The preparation method for the welded steel pipe for the boiler has advantages of easiness and convenience in operation, easiness in implementation, high forming efficiency, good product quality, high yield and the like; the prepared welded steel pipe has advantages of high inner surface quality and outer surface quality, no damage and flaw, good size stability and stability and the like, and the prepared welded steel pipe can serve as a steel pipe for a middle-high pressure boiler.

Description

technical field [0001] The invention relates to the technical field of steel pipe preparation, in particular to a method for preparing welded steel pipes for boilers. Background technique [0002] Welded steel pipes are prepared by using steel plates or steel strips through forming, welding, internal and external bead treatment, annealing heat treatment, shaping and other processes. The production level is a symbol of technological progress and product quality level of welded steel pipes. Compared with seamless steel pipes, the advantages of welded steel pipes are: higher dimensional accuracy, better surface quality, higher yield, less overall energy consumption, suitable for mass production, and lower cost than seamless steel pipes. Strong competitiveness and good development prospects. However, the current preparation methods for welded steel pipes have the disadvantages of low efficacy, easy scratches on the inner wall of the pipe, and low product qualification rate, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB21C37/0807C22C38/002C22C38/02C22C38/04C22C38/06C22C38/18C22C38/40C22C38/42C22C38/48
Inventor 范建平
Owner JIANGSU CHANGSHU HUANTONG IND
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