Method for producing X65 pipe steel with low cost

A pipeline steel, low-cost technology, applied in temperature control, metal rolling, etc., to achieve the effect of promoting recrystallization, improving utilization rate, and low cost

Inactive Publication Date: 2007-12-05
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no literature report on the development and production of single Nb microalloying with an electric furnace thin slab continuous casting and rolling process, with a Nb content of 0.045-0.050% (Wt.%) , micro-Ti treatment, low-cost X65 pipeline steel

Method used

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  • Method for producing X65 pipe steel with low cost

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Process route: electric furnace smelting → LF furnace refining → thin slab continuous casting (slab thickness 60mm) → continuous casting slab soaking → high pressure water descaling → controlled rolling → controlled cooling → coiling.

[0031] Chemical composition of molten steel: C: 0.046%, Si: 0.30%, Mn: 1.40%, P: 0.015%, S: 0.008%, Nb: 0.045%, Ti: 0.025%, N: 0.007%.

[0032] Continuous casting and hot rolling process: continuous casting casting speed: 4.8m / min, slab entering furnace temperature: 1050°C, furnace exit temperature: 1170°C, starting rolling temperature: 1080°C, final rolling temperature: 880°C, strong cooling mode, Coiling temperature: 620°C.

[0033] The structure of the steel strip is shown in Figure 1, and the grain size and properties of the steel strip are shown in Table 1.

[0034] Grain size and performance of table 1 embodiment 1 steel strip

[0035] Strip thickness

[0036] Note: Tensile, cold bending and impact are all taken transve...

Embodiment 2

[0038] Process route: electric furnace smelting → LF furnace refining → thin slab continuous casting (slab thickness 60mm) → continuous casting slab soaking → high pressure water descaling → controlled rolling → controlled cooling → coiling.

[0039] Chemical composition of molten steel: C: 0.053%, Si: 0.20%, Mn: 1.50%, P: 0.012%, S: 0.005%, Nb: 0.048%, Ti: 0.020%, N: 0.006%.

[0040] Continuous casting and hot rolling process: continuous casting casting speed: 4.5m / min, slab entering furnace temperature: 990°C, furnace exit temperature: 1180°C, starting rolling temperature: 1110°C, final rolling temperature: 860°C, strong cooling mode, Coiling temperature: 580°C. The structure of the steel strip is shown in Figure 2, and the grain size and properties of the steel strip are shown in Table 2.

[0041] Grain size and performance of table 2 embodiment 2 steel strip

[0042]

[0043]Note: Tensile, cold bending and impact are all taken transversely; the impact sample si...

Embodiment 3

[0045] Process route: electric furnace smelting → LF furnace refining → thin slab continuous casting (slab thickness 60mm) → continuous casting slab soaking → high pressure water descaling → controlled rolling → controlled cooling → coiling.

[0046] Chemical composition of molten steel: C: 0.060%, Si: 0.15%, Mn: 1.60%, P: 0.006%, S: 0.001%, Nb: 0.050%, Ti: 0.015%, N: 0.005%.

[0047] Continuous casting and hot rolling process: continuous casting casting speed: 4.0m / min, slab entering furnace temperature: 980°C, furnace exit temperature: 1200°C, starting rolling temperature: 1130°C, final rolling temperature: 840°C, strong cooling mode, Coiling temperature: 540°C.

[0048] The structure of the steel strip is shown in Figure 3, and the grain size and properties of the steel strip are shown in Table 3.

[0049] Grain size and performance of table 3 embodiment 3 steel strip

[0050]

[0051] Note: Tensile, cold bending and impact are all taken transversely; the impact...

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Abstract

The present invention discloses low cost process of producing X65 pipeline steel, which has reasonable metallurgical component design and is produced through EAF+LF smelting in an electric furnace, efficient continuous casting and rolling to form sheet billet and controlled cooling. The steel has components including C 0.046-0.060 wt%, Si 0.15-0.30 wt%, Mn 1.4-1.60 wt%, P 0.006-0.015 wt%, S 0.001-0.008 wt%, Nb 0.045-0.050 wt%, Ti 0.015-0.025 wt%, N 0.005-0.007 wt% and Fe and impurity for the rest. The process of the present invention can produce hot rolled X65 pipeline steel sheet coil of 6.0-10.0 mm thickness and meeting the requirement of API Spec 5L specification at low cost.

Description

technical field [0001] The invention belongs to the technical field of alloy steel production, in particular to a method for producing hot-rolled steel plates and steel strips for X65 pipelines at low cost by adopting an electric furnace thin slab continuous casting and rolling process. Background technique [0002] Pipeline steel has always played an important role in the field of metal materials. At present, most countries in the world use steel pipes for transporting oil and natural gas to comply with the American Petroleum Institute API Spec 5L specification, or based on this and according to specific pipeline engineering needs Make additional requests. The hot-rolled coils used to make such welded pipes are usually called pipeline steel. Pipeline steel has special requirements for comprehensive properties, which are manifested in high strength, high toughness, low ductile-brittle transition temperature, good welding performance, and certain corrosion resistance. At pr...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04B21B1/46B22D11/16B21B37/74
Inventor 毛新平庄汉洲李春艳王进步李轲新
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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