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Low-carbon low-alloy steel and pipe

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

Inactive Publication Date: 2003-03-19
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 pipe
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  • Low-carbon low-alloy steel and pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] According to the weight percentage of the chemical composition designed in the present invention and 150 tons of a batch of steel produced by electric furnace continuous casting in the electric furnace branch factory of Baosteel Steelmaking Department, rolled into steel pipes of 139.70*7.72 in the steel pipe branch company of Baosteel Co., Ltd., and according to different The tempering system is processed into X60~X80 steel grade line pipe. Randomly take two pipes to analyze the composition of the finished product. The specific chemical composition is as follows:

[0050]weight percentage

[0051] element

[0052] Analysis 1 Analysis 2

[0053] C 0.151 0.146

[0054] Si 0.229 0.232

[0055] Mn 1.108 1.101

[0056] P 0.007 0.010

[0057] S 0.003 0.005

[0058] V 0.089 0.085

[0059] Al 0.023 0.022

[0060] Ni 0.062 0.072

[0061] Cu 0.044 0.044

[0062] B 0.0019 0.0019 Others (Fe and impurities) Remaining amou...

Embodiment 2

[0077] According to the chemical composition weight percentage designed by the present invention and 150 tons of a batch of steel produced by electric furnace continuous casting in the electric furnace branch factory of Baosteel Steelmaking Department, rolled into steel pipes of 139.70*9.17 in the steel pipe branch company of Baosteel Co., Ltd., and according to different The tempering system is processed into X60~X80 steel grade line pipe. Randomly take two pipes to analyze the composition of the finished product. The specific chemical composition is as follows:

[0078] weight percentage

[0079] element

[0080] Analysis 1 Analysis 2

[0081] C 0.148 0.144

[0082] Si 0.267 0.259

[0083] Mn 1.077 1.081

[0084] P 0.011 0.011

[0085] S 0.006 0.005

[0086] V 0.110 0.112

[0087] Al 0.028 0.029

[0088] Ni 0.013 0.014

[0089] Cu 0.086 0.095

[0090] B...

Embodiment 3

[0117] According to the weight percentage of the chemical composition designed in the present invention, it is smelted in a small furnace in the steelmaking workshop of the product room of Baosteel Technology Center, and finally formed into plates with a thickness of 20mm and 30mm after forging and rolling. The specific chemical composition is as follows:

[0118] weight percentage

[0119] element

[0120] 20mm 30mm

[0121] C 0.164 0.156

[0122] Si 0.276 0.269

[0123] Mn 1.197 1.220

[0124] P 0.007 0.006

[0125] S 0.005 0.005

[0126] V 0.089 0.085

[0127] Al 0.008 0.012

[0128] Ni 0.089 0.085

[0129] Cu 0.069 0.081

[0130] B 0.0017 0.0019

[0131] Others (Fe and impurities) remaining amount remaining amount

[0132] After quenching at 910°C, when the tempering temperature is 700°C, the physical quality is shown in the table below, which meets the requiremen...

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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, in particular to a low-carbon low-alloy steel and the produced pipe. Background technique [0002] With the continuous development of the world's petroleum industry, pipeline transportation of oil and gas has shown greater advantages over other means of transportation due to its 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 gradually developed to 60KSI strength level and 80KSI strength level, and some engineering pipes even reached the level of 100KSI strength level. [0003] For products with a strength level of 60KSI to 80KSI, in industry standards, such as the American standard API SPEC 5L for line pipes, there is no specific material composition details, only the minimum content of impurity elements is required, and it is impossible to produce produc...

Claims

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Application Information

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Patent Type & Authority Applications(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
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