Medium-carbon low-cost L245-L320-grade pipeline steel and manufacturing method thereof

A L245-L320, pipeline steel technology, applied in the field of low-alloy steel production technology, can solve the problem of high production cost, achieve the effects of reducing alloy cost, improving refinement degree and uniformity, and high production flexibility

Inactive Publication Date: 2016-12-07
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] This patent aims at the problem of high production cost of L245-L320 grade pipeline steel produced by traditional plate rolling mills. The invention provides a medium-car...

Method used

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  • Medium-carbon low-cost L245-L320-grade pipeline steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 A medium-carbon low-cost L245-L320 grade pipeline steel and its manufacturing method

[0026] Its chemical composition is composed as follows by mass percentage:

[0027] C: 0.16%, Si: 0.19%, Mn: 0.6%, P: 0.013%, S: 0.002%, Al: 0.025%, and the rest are iron and unavoidable impurities.

[0028] Manufacturing process: KR→converter smelting→deoxidation alloying→CAS→LF→VD / RH→continuous casting→slab stacking and slow cooling for 48 hours→slab heating→scaling→rough rolling→finish rolling→ACC→straightening→ Cooling→flaw detection→marking and warehousing. in,

[0029] (1) Heating: The above-mentioned prepared raw materials are smelted on a 120-ton converter, the continuous casting slab is heated to 1220°C, the heating rate is 1cm / 9-10min, and the time in the furnace is 3h.

[0030] (2) Rolling: three-stage rolling of forming, widening, and elongation is adopted. The rolling start temperature of the roughing mill is 1150°C, and the reduction rate of the roughing pas...

Embodiment 2

[0034] Example 2 A medium-carbon low-cost L245-L320 grade pipeline steel and its manufacturing method

[0035] Its chemical composition is composed as follows by mass percentage:

[0036] C: 0.15%, Si: 0.15%, Mn: 0.55%, P: 0.011%, S: 0.003%, Al: 0.03%, and the rest are iron and unavoidable impurities.

[0037] Manufacturing process: KR→converter smelting→deoxidation alloying→CAS→LF→VD / RH→continuous casting→slab stacking and slow cooling for 48 hours→slab heating→scaling→rough rolling→finish rolling→ACC→straightening→ Cooling→flaw detection→marking and warehousing. in,

[0038] (1) Heating: The above-mentioned prepared raw materials are smelted in a 120-ton converter, and the continuous casting slab is heated to 1190°C with a heating rate of 1cm / 9-10min and a furnace time of 2.5h.

[0039] (2) Rolling: Three-stage rolling of forming, widening, and elongation is adopted. The rolling start temperature of the roughing mill is 1160°C, and the reduction rate of the roughing pass ...

Embodiment 3

[0042] Example 3 A medium-carbon low-cost L245-L320 grade pipeline steel and its manufacturing method

[0043] Its chemical composition is composed as follows by mass percentage:

[0044] C: 0.17%, Si: 0.14%, Mn: 0.5%, P: 0.01%, S: 0.0025%, Al: 0.036%, and the rest are iron and unavoidable impurities.

[0045] Manufacturing process: KR→converter smelting→deoxidation alloying→CAS→LF→VD / RH→continuous casting→slab stacking and slow cooling for 48 hours→slab heating→scaling→rough rolling→finish rolling→ACC→straightening→ Cooling → flaw detection → marking, storage. in,

[0046] (1) Heating: The above-mentioned prepared raw materials are smelted in a 120-ton converter, and the continuous casting slab is heated to 1200°C with a heating rate of 1cm / 9-10min and a furnace time of 3h.

[0047] (2) Rolling: Three-stage rolling of forming, widening, and elongation is adopted. The rolling start temperature of the roughing mill is 1140°C, and the reduction rate of the roughing pass is ≥12%...

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Abstract

The invention relates to medium-carbon low-cost L245-L320-grade pipeline steel and a manufacturing method thereof. The pipeline steel comprises the following chemical components by mass percent: 0.14 to 0.18% of C, 0.1 to 0.3% of Si, 0.5 to 0.7% of Mn, 0.005% or less of S, 0.015% or less of P and 0.02 to 0.06% of Al, and the balance being iron and unavoidable impurities. The technological process comprises the steps of KR, converter smelting, deoxidation alloying, CAS, LF, VD/RH, continuous casting, 48 hours of casting blank stacking and cooling, casting blank heating, scale removal, rough rolling, finish rolling, ACC, straightening, cooling, flaw detection, and marking and storage. According to the medium-carbon low-cost L245-L320-grade pipeline steel and the manufacturing method thereof, the content of carbon elements is increased, the utilization amounts of V, Ti and Nb are decreased, the alloy cost is effectively reduced, the fineness degree and uniformity of the structure of a product are improved, and the production flexibility of the manufacturing method is high.

Description

technical field [0001] The invention belongs to the field of low-alloy steel production technology, and in particular relates to a medium-carbon low-cost L245-L320 grade pipeline steel and a manufacturing method thereof. Background technique [0002] L245-L320 grade pipeline steel is widely used in our country, and it is growing at a rate of 10% per year. This kind of pipeline steel is usually produced by the method of "low carbon plus microalloying", and the addition of a large number of alloy elements will inevitably cause costs. It remains high, and there is no obvious competitive advantage in the severe market situation, and it is urgent to invent a new production process. This plan proposes to use medium carbon components, combined with the corresponding adjustment of the rolling process and water cooling process for production, which can not only meet the performance requirements of the steel plate, but also achieve reasonable control of production costs and improve pr...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02
CPCC22C38/02C21D8/0226C21D2211/005C21D2211/009C22C38/04C22C38/06
Inventor 何绪友王杰李延芝宋婷婷崔风平张尔康孔雅陈天学郭耀荣
Owner SHANDONG IRON & STEEL CO LTD
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