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Low-carbon low-alloy steel and produced pipe

A low-alloy steel and pipe technology applied in the field of metal steel to achieve the effects of small deformation resistance, low carbon content, and low alloy content

Inactive Publication Date: 2004-05-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopting the alloy of the present invention is beneficial to continuous casting to produce seamless steel pipe products

Method used

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  • Low-carbon low-alloy steel and produced pipe
  • Low-carbon low-alloy steel and produced pipe
  • Low-carbon low-alloy steel and produced pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] According to the chemical composition weight percentage designed in the present invention, a furnace of 150 tons of steel produced by electric furnace continuous casting in the electric furnace branch of Baosteel's steelmaking department is rolled into 139.70*7.72 steel pipes at the Baosteel Steel Pipe Branch, and is different The tempering system is processed into X60~X80 steel grade line pipe. Randomly take two pipes for composition analysis of the finished product. The specific chemical composition is as follows:

[0059] Weight percentage

[0060] element

[0061] Analysis 1 Analysis 2

[0062] C 0.151 0.146

[0063] Si 0.229 0.232

[0064] Mn 1.108 1.101

[0065] P 0.007 0.010

[0066] S 0.003 0.005

[0067] V 0.089 0.085

[0068] Al 0.023 0.022

[0069] Ni 0.062 0.072

[0070] Cu 0.044 0.044

[0071] B 0.0019 0.0019

[0072] Others (Fe and impurities) Residual amount Residual amount

[0073] The mechanical properties of the ab...

Embodiment 2

[0104] According to the chemical composition weight percentage designed in the present invention, a furnace of 150 tons of steel produced by electric furnace continuous casting at Baosteel’s steelmaking department’s electric furnace branch is rolled into 139.70*9.17 steel pipes at Baosteel’s steel pipe branch, and is different The tempering system is processed into X60~X80 steel grade line pipe. Randomly take two pipes for composition analysis of the finished product. The specific chemical composition is as follows:

[0105] Weight percentage

[0106] element

[0107] Analysis 1 Analysis 2

[0108] C 0.148 0.144

[0109] Si 0.267 0.259

[0110] Mn 1.077 1.081

[0111] P 0.011 0.011

[0112] S 0.006 0.005

[0113] V 0.110 0.112

[0114] Al 0.028 0.029

[0115] Ni 0.013 0.014

[0116] Cu 0.086 0.095

[0117] B 0.0022 0.0020

[0118] Others (Fe and impurities) Residual amount Residual amount

[0119] After being quenched at 910°C, the on-site ...

Embodiment 3

[0144] The weight percentage of the chemical composition designed according to the present invention is smelted in a small furnace in the steelmaking workshop of Baosteel Technology Center's product room. After forging and rolling, plates with thicknesses of 20mm and 30mm are finally formed. The specific chemical compositions are as follows:

[0145] Weight percentage

[0146] element

[0147] 20mm 30mm

[0148] C 0.164 0.156

[0149] Si 0.276 0.269

[0150] Mn 1.197 1.220

[0151] P 0.007 0.006

[0152] S 0.005 0.005

[0153] V 0.089 0.085

[0154] Al 0.008 0.012

[0155] Ni 0.089 0.085

[0156] Cu 0.069 0.081

[0157] B 0.0017 0.0019

[0158] Others (Fe and impurities) Residual amount Residual amount

[0159] After being quenched at 910℃, when the tempering temperature is 700℃, the actual mass is shown in the following table, which meets the requirements of X60 steel grade PSL II line pipe:

[0160] Yield resistance

[0161] Serial n...

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Abstract

The present invention relates to one kind of low-carbon and low-alloy steel and produced pipe and aims at raising strength, toughness, hardness penetration and welding performance of alloy steel. The low-carbon and low-alloy steel of the present invention includes the following elements: C, Si, Mn, Al, V, Ni, B, P, S, Mo, co and Nb except Fe and impurity. The low-carbon and low-alloy steel may be used in producing conduit line pipe and other pipe of steel grade X60-X80.

Description

Technical field [0001] The invention belongs to the field of metal iron and steel, and particularly relates to a low-carbon and low-alloy steel and a pipe made thereof. Background technique [0002] With the continuous development of the world petroleum industry, pipeline transportation of oil and gas has shown greater advantages over other transportation methods due to its characteristics of safety, reliability, economy, energy saving, and high efficiency. The construction of oil and gas pipelines around the world is developing rapidly. The original strength level below 56KSI is gradually developing to 60KSI strength level and 80KSI strength level, and some engineering pipes even reach the level of 100KSI strength level. [0003] Regarding the 60KSI to 80KSI strength level products, in the industry standards, such as the American standard API SPEC 5L for line pipes, there is no specific material composition list, only the minimum impurity element content is required. According t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12F16L9/02
Inventor 黄子阳阎名陈思孝刘麒麟顾文兵韩立新
Owner BAOSHAN IRON & STEEL CO LTD