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A kind of rare earth-containing seamless steel pipe for gas cylinders resistant to moisture h2s corrosion and production method thereof

A technology of seamless steel pipes and production methods, which is applied in the fields of recycling technology, process efficiency improvement, metal recovery, etc., and can solve problems such as unreported and unseen seamless steel pipe manufacturing methods

Inactive Publication Date: 2015-09-16
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After searching, there is no record of this type of seamless steel pipe and its manufacturing method in the invention patent literature of China, and there is no report in domestic and foreign books and periodicals.

Method used

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  • A kind of rare earth-containing seamless steel pipe for gas cylinders resistant to moisture h2s corrosion and production method thereof
  • A kind of rare earth-containing seamless steel pipe for gas cylinders resistant to moisture h2s corrosion and production method thereof
  • A kind of rare earth-containing seamless steel pipe for gas cylinders resistant to moisture h2s corrosion and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The ratio of raw materials (by weight percentage) is: 90% of blast furnace molten iron and 10% of high-quality steel scrap.

[0043] The sequence of the production process is briefly described as follows: molten iron pretreatment→top-bottom combined blowing converter smelting→LF furnace refining→VD vacuum treatment→round billet continuous casting→cutting→tube billet heating→piercing→continuous rolling→sizing→cooling→sawing → heat treatment → straightening → flaw detection.

[0044] The specific production process is as follows:

[0045] 90 tons of blast furnace molten iron was pretreated with "metal magnesium powder" for desulfurization and deoxidation, so that the S content in the molten iron was reduced to (weight percent) below 0.010%;

[0046] Mix the 90 tons of pretreated molten iron into a 100-ton top-bottom combined blown converter, add 10 tons of high-quality steel scrap, and then use the single slag process for smelting. The final slag basicity is controlled a...

Embodiment 2

[0067] The ratio of raw materials, production process, etc. and other process indicators of Example 2 are the same as those of Example 1, the difference is the chemical composition content of the tube blank, and the specific content (% by weight) is as shown in Table 4:

[0068] Table 4 The test results of the chemical composition content of the tube blank (weight %)

[0069]

[0070] From the test results, its chemical composition content meets the design requirements, and its low-magnification inspection of sulfur marks does not exceed grade 1.0, which meets the control requirements. See Table 5 for the test values ​​of mechanical properties of the qualified seamless steel pipes for gas cylinders rolled by it, and see Table 6 for the test results of SSC performance, HIC performance, structure and grain size.

[0071] Table 5 Test results of mechanical properties of steel pipes

[0072]

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Abstract

The invention relates to a rare earth-containing wet H2S corrosion resistance gas cylinder seamless steel pipe and a production method thereof, and belongs to the technical field of metallurgy and molding, wherein raw materials comprise 90 Wt% of blast furnace molten iron and 10 Wt% of high quality scrap steel, and chemical components of the pipe billet comprise 0.07-0.13 Wt% of C, 0.10-0.30 Wt% of Si, 0.80-1.10 Wt% of Mn, less than or equal to 0.015 Wt% of P, less than or equal to 0.005 Wt% of S, 0.80-1.10 Wt% of Cr, 0.20-0.50 Wt% of Mo, 0.05-0.12 Wt% of V, 0.01-0.03 Wt% of Ti, 0.005-0.030 Wt% of Al, 0.0005-0.010 Wt% of rare earth element RE, less than 0.10 Wt% of Cu, and the balance of Fe and difficultly detected trace elements. The process comprises a molten iron pretreatment, smelting through a top and bottom composite blowing furnace, refining through a LF furnace, a VD vacuum treatment, round billet continuous casting, cutting, pipe billet heating, piercing, continuous rolling, stretch reducing, cooling, sawing, a heat treatment, straightening and inspection. The rare earth-containing wet H2S corrosion resistance gas cylinder seamless steel pipe has the following mechanical properties that: a yield strength is 650-720 MPa, a tensile strength is 800-890 MPa, a yield ratio is less than or equal to 0.86, an elongation rate is more than or equal to 22%, a lateral impact value is more than or equal to 100 J / cm<2> (0 DEG C), a shear ratio is 100%, a grain size is more than or equal to 8.5 grade, a hardness is less than or equal to 236 HV10, and residual stress is less than or equal to 30 MPa. The product has characteristics of good process performance, high impact toughness, fine grain size, and good wet H2S corrosion resistance.

Description

1. Technical field: [0001] The invention belongs to the technical field of ferrous metal smelting and metal pressure processing, and relates to a rare earth-containing moisture-resistant H 2 S corroded seamless steel pipes for gas cylinders and production methods thereof. 2. Background technology: [0002] A high-pressure gas cylinder is a mobile steel cylinder that can be refilled with high-pressure gas or liquefied natural gas. The nominal working pressure is generally 10-30MPa. There are two methods for manufacturing gas cylinders, one is the forming method of using steel billets to stretch and close by hot stamping; the other is the forming method of using seamless steel pipes as blanks and closing by hot spinning. Manufacturing high-pressure gas cylinders with seamless steel pipes has the advantages of low cost and good quality. [0003] Due to the presence of H in some oil and gas resources in my country 2 S gas, which brings serious corrosion problems to high-press...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28B23P15/00C21C1/02C21D8/10
CPCY02W30/54Y02P10/20
Inventor 丰小冬贺景春乔爱云郝振宇石晓霞马爱清
Owner INNER MONGOLIA BAOTOU STEEL UNION