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Seamless steel pipe and its manufacturing method

A manufacturing method and technology for seamless steel pipes, which are applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problem that the production process of seamless steel pipes is difficult to meet the production requirements of X100 seamless steel pipes, etc., so as to improve high temperature performance, Guaranteed uniformity

Active Publication Date: 2016-01-20
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a seamless steel pipe and its manufacturing method to solve the problem that the production process of seamless steel pipes in the prior art is difficult to meet the production needs of X100 seamless steel pipes

Method used

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  • Seamless steel pipe and its manufacturing method
  • Seamless steel pipe and its manufacturing method
  • Seamless steel pipe and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Smelting of blanks

[0031] According to the ratio of 500kg / t to add molten iron and 500kg / t to add scrap steel produced by the production of oil well pipes and pipeline steel pipes, as raw materials, after smelting in a 45-ton electric furnace and refining in a 45-ton refining furnace, and adding 3kg / t during the smelting process t ferrosilicon, 18kg / t low-carbon ferromanganese, 2.5kg / t nickel plate, 9kg / t micro-carbon ferrochromium, 7kg / t ferromolybdenum, and a small amount of aluminum wire, ferro-niobium and ferro-titanium, the above raw materials are used in 45 tons Vacuum degassing furnace process for vacuum smelting of molten steel; then feed calcium wire for calcium treatment, and then use round billet arc continuous casting machine for continuous casting; in the above process, control the refining furnace ladle hanging ladle molten steel temperature = liquidus line Temperature +(70~100)±10℃; tundish baking for 3 hours, baking temperature above 1100℃; casting...

Embodiment 2

[0050] (1) Smelting of blanks

[0051] Add molten iron at a ratio of 600kg / t and scrap steel produced by producing oil well pipes and pipeline steel pipes at a ratio of 400kg / t. As raw materials, they are smelted in a 45-ton electric furnace and refined in a 45-ton refining furnace. During the smelting process, they are added in the following proportions : 2kg / t ferrosilicon, 19kg / t low-carbon ferromanganese, 2.0kg / t nickel plate, 8kg / t micro-carbon ferrochromium, 8kg / t ferromolybdenum, and a small amount of aluminum wire, ferro-niobium and ferro-titanium, the above raw materials Vacuum smelting of molten steel is carried out by using a 45-ton vacuum degassing furnace process; then calcium treatment is carried out by feeding calcium wire, and then continuous casting is carried out by a round billet arc continuous casting machine; Liquidus temperature +(70~100)±10℃; tundish baking for 3 hours, baking temperature above 1100℃; casting speed controlled at 0.80m / min; crystallizer v...

Embodiment 3

[0072] (1) Smelting of blanks

[0073] Add molten iron at a ratio of 700kg / t and add scrap steel produced by producing oil well pipes and pipeline steel pipes at a ratio of 300kg / t, as raw materials, after smelting in a 45-ton electric furnace and refining in a 45-ton refining furnace, and add in the following proportions during the smelting process : 4kg / t ferrosilicon, 17kg / t low-carbon ferromanganese, 2.0kg / t nickel plate, 10kg / t micro-carbon ferrochromium, 6kg / t ferromolybdenum, and a small amount of aluminum wire, ferro-niobium and ferro-titanium, the above raw materials Vacuum smelting of molten steel is carried out by using a 45-ton vacuum degassing furnace process; then calcium treatment is carried out by feeding calcium wire, and then continuous casting is carried out by a round billet arc continuous casting machine; Liquidus temperature +(70~100)±10℃; tundish baking for 3 hours, baking temperature above 1100℃; casting speed controlled at 0.50m / min; crystallizer vibra...

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Abstract

The invention provides a seamless steel tube and a manufacturing method thereof. The manufacturing method comprises the following steps of: step one, smelting a raw material to obtain a blank, wherein the raw materials comprises the following chemical components in percentage by weight: 0.07%-0.12% of C, 0.10%-0.35% of Si, 1.00%-1.50% of Mn, 0.10%-0.50% of Ni, 0.10%-0.50% of Cr, 0.10%-0.50% of Mo, 0.01%-0.05% of Nb, 0.02%-0.05% of Al, 0.01%-0.05% of Ti, less than or equal to 0.25% of Cu, less than or equal to 0.1% of V, less than or equal to 0.02% of P, less than or equal to 0.05% of S, and the balance of Fe and inevitable impurities; and step two, rolling the blank to obtain a tube blank; and step three, carrying out thermal treatment on the tube blank to obtain the seamless steel tube. The strength, the toughness and the welding performance of the seamless steel tube can meet the requirements of long-distance delivery lines.

Description

technical field [0001] The invention relates to the field of manufacturing seamless steel pipes, in particular to a seamless steel pipe and a manufacturing method thereof. Background technique [0002] With the development of the world's oil and natural gas industry, the construction of long-distance transmission pipelines is developing in the direction of large diameter, large wall thickness, and high-pressure transmission, which requires pipeline steel to have high strength and high toughness. Harsh, high security requirements. Compared with welded pipes, the performance of seamless steel pipes for high-grade pipelines produced by seamless technology is more stable and uniform. At present, the strength of pipeline steel has been increased from X52~X65 in the original APISPEC5L standard to X80~X100, so the comprehensive performance has been developed. Seamless steel pipes for higher high-grade pipelines have become the development trend of pipeline steel today. However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C33/04C21D8/10F16L9/02
CPCY02P10/20
Inventor 谢凯意黄电源
Owner HENGYANG VALIN STEEL TUBE