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Manufacturing method of alloy steel section tubes

A manufacturing method and a special-shaped tube technology, which are applied in the field of manufacturing alloy steel special-shaped tubes by hot extrusion, to achieve the effects of good product quality, reduction of production costs, and satisfaction of large-scale industrial production.

Inactive Publication Date: 2014-05-14
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the manufacturing method of such low-alloy steel, the above-mentioned problems still exist

Method used

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  • Manufacturing method of alloy steel section tubes
  • Manufacturing method of alloy steel section tubes
  • Manufacturing method of alloy steel section tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Follow the steps below to manufacture Q345B special-shaped pipes.

[0036] (1) Rod preparation: smelt the metal into an alloy steel whose chemical composition and weight percentage are 0.14% carbon, 1.2% manganese, 0.38% silicon, 0.019% sulfur, 0.015% phosphorus, 0.06% copper, and the balance is iron. into steel ingots, steel ingots are forged or rolled into bars, and the diameter of the bars is .

[0037] (2) Bar machining: Use a long stripping machine to strip the surface defects of the bar, and then saw the bar into blanks with a length of 400-500mm.

[0038] (3) Drilling: Then use a deep hole drilling machine to drill the blank with a diameter of 45mm; then process the end face (to make the end face flat), chamfer one end, and make it as figure 1 The tube blank 1 shown.

[0039] (4) Reaming: such as Figure 2A and Figure 2B As shown, the tube blank 1 is preheated to 700-750°C with a ring furnace first, and then the tube blank 1 is heated to 1100-1200°C with a...

Embodiment 2

[0045] Follow the steps below to manufacture Q345B special-shaped pipes.

[0046] (1) Bar preparation: metal smelting into alloy steel with chemical composition and weight percentage of 0.16% carbon, 1.4% manganese, 0.20% silicon, 0.015% sulfur, 0.010% phosphorus, 0.14% copper, and iron as the balance, casting into steel ingots, steel ingots are forged or rolled into bars, and the diameter of the bars is .

[0047](2) Bar machining: Use a long stripping machine to strip the surface defects of the bar, and then saw the bar into blanks with a length of 500-600mm.

[0048] (3) Drilling: Then use a deep-hole drilling machine to drill the blank with a diameter of 45 mm; then process the end face (to make the end face flat), and chamfer one end to obtain the tube blank 1 .

[0049] (4) Hole expansion: Preheat the tube blank 1 to 800-900°C with a ring furnace first, then heat the tube blank 1 to 1100-1200°C with an induction heating furnace, and use a hole reamer 2 to expand the t...

Embodiment 3

[0054] Follow the steps below to manufacture Q345B special-shaped pipes.

[0055] (1) Rod preparation: smelt the metal into an alloy steel whose chemical composition and weight percentage are 0.20% carbon, 1.6% manganese, 0.45% silicon, 0.020% sulfur, 0.020% phosphorus, 0.40% copper, and the balance is iron. into steel ingots, steel ingots are forged or rolled into bars, and the diameter of the bars is .

[0056] (2) Machining of rods: Use a long material peeling machine to strip the surface defects of the rods, and then saw the rods into blanks with a length of 400-450 mm.

[0057] (3) Drilling: Then drill the blank with a deep hole drilling machine, the diameter of the drilled hole is Ф44.8mm; then process the end face (make the end face flat), and chamfer one end to obtain the tube blank 1.

[0058] (4) Hole expansion: Preheat the tube blank 1 to 800-900°C with a ring furnace, then heat the tube blank 1 to 1150-1200°C with an induction heating furnace, and use a hole rea...

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Abstract

The invention provides a manufacturing method of alloy steel section tubes. The method comprises the following steps: (1) forging steel ingots of alloy steel to a bar material; (2) after removing surface defects of the bar material, cutting the bar material to blank materials with predetermined lengths; (3) drilling the blank materials to manufacture tube blanks; (4) preheating the tube blanks to 600-900 DEG C, and broaching the tube blanks after the tube blanks are heated to 1000-1200 DEG C; (5) after the broached tube blanks are heated to 1100-1300 DEG C, performing extrusion molding to obtain the section tubes. By adopting the manufacturing method of the alloy steel section tubes, the production process can be simplified, the production cost can be largely reduced, the requirements of large-scale industrial production can be met, and the section tubes with the good quality are obtained.

Description

technical field [0001] The invention relates to a method for manufacturing an alloy steel special-shaped pipe, in particular to a method for manufacturing an alloy steel special-shaped pipe by hot extrusion. Background technique [0002] At present, the main method of manufacturing alloy steel special-shaped pipe is the hot extrusion method. In the hot extrusion method, after the alloy steel is hot-extruded, the tube blank obtained after extrusion needs to be machined or cold-drawn. In order to obtain finished products that meet the size requirements. Although the surface quality of the special-shaped tube manufactured by this method is good, there are still defects such as inner hole scribing and underfilling, and some dimensions are difficult to process and the twist degree after processing is poor. [0003] Specifically, for low-alloy steel (that is, the total amount of alloying elements is less than 3.5%), since low-alloy steel (take Q345B steel as an example) has good ...

Claims

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Application Information

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IPC IPC(8): B21C37/15
Inventor 李利盛黄新琼敬帅刘仕林
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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