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Manufacturing method for high manganese steel seamless pipe

A manufacturing method and technology of high manganese steel, applied in the field of manufacturing high manganese steel high strength corrosion resistant seamless pipes, can solve the problems of no high manganese austenitic steel seamless pipes, achieve uniform austenite structure and promote development , the effect of meeting the expansion performance requirements

Active Publication Date: 2017-09-08
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the production of high-manganese austenitic steel seamless pipes in China at present, and most of the reports focus on automobile steel plates and other fields

Method used

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  • Manufacturing method for high manganese steel seamless pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. The chemical composition weight percentage (%) of the steel used is: C content 0.13%, Si content 1.90%, Mn content 25.05%, Al content 3.18%, P content 0.013%, S content 0.008%, Nb content 0.25%.

[0020] 2. Forging

[0021] The steel ingot was heated at 1220°C for 8.5 hours; the starting forging temperature was 1060°C and the final forging temperature was 890°C. Forging a long round steel billet with a diameter of 290mm and 2.2m. After forging, the round billet is quickly buckled with a heat preservation cover for slow cooling, and then hangs the cover after 48 hours.

[0022] 3. Blank preparation

[0023] The round blank is peeled and sawed by a machined circular car to become a blank with a diameter of 277mm and a length of 700mm. A through hole with a diameter of 60mm is drilled in the center of the blank with a deep hole drill.

[0024] Blank outer diameter deviation -1mm.

[0025] Blank length deviation +3 mm.

[0026] Through hole concentricity 0.4mm;

[0...

Embodiment 2

[0047] 1. The furnace number and chemical composition of the material used are the same as in Example 1.

[0048] 2. Forging

[0049] The steel ingot was heated at 1240°C for a heating time of 8.5 hours; the starting forging temperature was 1060°C and the final forging temperature was 930°C. Forging a long round steel billet with a diameter of 360mm and 1.4m. After forging, the round billet is quickly buckled with a heat preservation cover for slow cooling, and then hangs the cover after 48 hours.

[0050] 3. Blank preparation

[0051] The round blank is peeled and sawed by a machined circular car to become a blank with a diameter of 344mm and a length of 1000mm. A through hole with a diameter of 80mm is drilled in the center of the blank with a deep hole drill.

[0052] Blank outer diameter deviation -1.5mm.

[0053] Blank length deviation +4 mm.

[0054] Through hole concentricity 0.4mm;

[0055] The surface roughness of the billet is Ra=4.2μm.

[0056] 4. Hot extrusio...

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Abstract

The invention relates to a manufacturing method for a seamless pipe, and in particular to a manufacturing method for a high manganese steel seamless pipe with high strength and corrosion resistance. The manufacturing method for the high manganese steel seamless pipe comprises the following steps that a high manganese steel ingot comprising, by weight percentage (%), 0.08-0.60% of C, 0.10-3.60% of Si, 15.00-28.00% of Mn, 0.02-4.50% of Al, no more than 0.045% of P, no more than 0.045% of S, 0.01-0.30% of Nb, 0.001-0.040% of N, 0.01-0.20% of Ti, 0.01-0.20% of V, and the balance Fe and inevitable impurities is kept warm for 6-8 hours at the temperature of 1150-1250 DEG C, the steel ingot is hot-forged into a cylindrical blank at the temperature of 850-1150 DEG C, then the cylindrical blank is covered with a heat preservation cover quickly for slow cooling, and the cylindrical blank is air-cooled to the room temperature 48 hours later by hoisting the cover away.

Description

technical field [0001] The invention relates to a method for manufacturing a seamless steel pipe, in particular to a method for manufacturing a high-manganese steel high-strength corrosion-resistant seamless pipe. Background technique [0002] Expandable casing technology is an innovative technology in the field of oil exploration that has been newly developed in the past ten years. In the 1990s, Shell Company of the Netherlands proposed the concept and soon carried out the application. This technology is called a revolution in drilling technology. The use of expandable casing technology can realize equal-diameter drilling, reduce the size of the upper hole of oil and gas wells, optimize the drilling tool combination, increase the ROP, and save the cost of wellhead equipment, drilling fluid, cycle time, cement, drill bit and platform. According to statistics, this technology can reduce the consumption of drilling fluid by 44%, the consumption of cement by 42%, the consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/60
CPCB21C37/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/60
Inventor 张宇斌张志波刘宇王育田康喜唐
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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