Method for manufacturing high-strength pipe steel

A technology of pipe fittings and controlled rolling, which is applied in the direction of manufacturing converters, improvement of process efficiency, furnace type, etc., to achieve low production cost, improved toughness and corrosion resistance, and excellent welding performance

Active Publication Date: 2013-02-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that similar products in the prior art cannot fully meet the current use and manufacturing requirements, and it is necessary to develop a high-strength and high-toughness steel for pipe fittings

Method used

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  • Method for manufacturing high-strength pipe steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: For the manufacture of thick X80 pipeline steel plates with a thickness specification of 25.7 mm

[0041] Heating temperature: 1170±20°C, rolling temperature range in the recrystallization zone is 1130~980°C, the thickness of the billet to be heated in the middle (that is, the thickness of the billet after rolling in the recrystallization zone) is 110mm, and the temperature range in the non-recrystallization zone is 890~750°C . Stop cooling temperature 450 ~ 500 ℃. The cooling rate is 15-20°C / s. Quenching temperature: 910±10°C, quenching holding time: 40min; tempering temperature: 550±10°C; tempering holding time: 70min.

Embodiment 2

[0042] Example 2: Steel for high-strength pipe fittings with a thickness specification of 32.0 mm

[0043] Heating temperature: 1130±20°C, rolling temperature range in the recrystallization zone is 1120-950°C, the thickness of the billet to be heated in the middle is 120mm, and the temperature range in the non-recrystallization zone is 870-780°C. The termination cooling temperature is 580-620°C. The cooling rate is 12-17°C / s. Quenching temperature: 960±10°C, quenching holding time: 50min; tempering temperature: 600±10°C; tempering holding time: 90min.

Embodiment 3

[0044] Embodiment 3: Steel for manufacturing high-strength pipe fittings with a thickness specification of 47.0 mm

[0045] Heating temperature: 1150±20°C, rolling temperature range in the recrystallization zone is 1100-960°C, the thickness of the billet to be heated in the middle is 100mm, and the temperature range in the non-recrystallization zone is 890-750°C. Stop cooling temperature 450 ~ 500 ℃. The cooling rate is 8-12°C / s. Quenching temperature: 910±10°C, quenching holding time: 40min; tempering temperature: 580±10°C; tempering holding time: 100min.

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Abstract

The invention relates to pipe steel and a method for manufacturing the same. The pipe steel comprises the following components in percentage by weight: 0.02-0.12 percent of C, 0.10-0.35 percent of Si, 1.40-2.00 percent of Mn, no more than 0.015 percent of P, no more than 0. 005 percent of S, 0.021-0.05 percent of Ti, 0.05-0.40 percent of Cr, 0.05-0.30 percent of Mo, 0.10-0.30 percent of Cu, 0.10-0.24 percent of Ni, no more than 0. 008 percent of N, 0.02-0.07 percent of Nb, 0.01-0.08 percent of V and the balance of Fe and inevitable impurities. The pipe steel has the characteristics of high strength, excellent low temperature impact toughness and excellent weldability, and can be used for constructing long-distance petroleum and natural gas transmission pipelines, slurry transmission pipeline, city pipeline networks and the like.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a manufacturing method of steel for thick-gauge high-strength pipe fittings. Background technique [0002] Pipe fittings are used to change the direction of the pipeline, change the size of the pipe diameter, branch the pipeline, and locally strengthen it to achieve special connections. It is widely used in various pressure pipelines, such as oil and gas transmission pipelines, urban pipe network pipes, thermal Pipes, slurry pipes, etc. Commonly used pipe fittings include elbows, tees, reducers (big and small heads), pipe caps, pipe joints, pipe collars, nozzles, etc. [0003] Pipe fittings are generally made by steel plate forming, heat treatment, or by direct forging. Pipe fittings are connected to straight pipe sections or valves by welding, and the delivery pressure must be basically the same as that of straight pipe sections. Therefore, there are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C21C5/28C21C5/52C21C7/00C21D1/25C21D8/10
CPCY02P10/143Y02P10/20
Inventor 郑磊章传国高珊李冰
Owner BAOSHAN IRON & STEEL CO LTD
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