Rare earth containing H profile steel with high strength and high toughness and production method thereof

A high-strength, high-toughness, production method technology, applied to the improvement of process efficiency, metal rolling, etc., can solve the problems of limited toughness improvement, large toughness fluctuations, unstable mechanical properties, etc.

Inactive Publication Date: 2013-08-28
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The chemical composition design is simple, just adding trace amounts of Nb and B on the basis of C and Mn steel, so the strength only reaches the level of Q345, and the toughness improvement is also very limited; the mechanical properties are very unstable, especially the low temperature impact toughness fluctuates greatly

Method used

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  • Rare earth containing H profile steel with high strength and high toughness and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Raw materials by weight percentage are: 90% of blast furnace molten iron and 10% of high-quality steel scrap.

[0038] The production process is as follows: molten iron pretreatment→top-bottom combined blowing converter smelting→LF furnace refining→VD vacuum treatment→square casting→cutting→casting heating→high-pressure water phosphorus removal→BD1 breaking→BD2 rolling→high-pressure water Phosphorus removal→CCS universal rolling→straightening→cooling→flaw detection→sawing.

[0039] The specific production process is briefly described as follows:

[0040] 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%;

[0041] 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 basici...

Embodiment 2

[0061] The ratio of raw materials, production process, etc. and other process indicators of embodiment 2 are all the same as embodiment 1, except that the chemical composition content (% by weight) of its casting failure is specifically shown in table 3:

[0062] The bad chemical composition detection result (weight %) of table 3 casting

[0063] C Si mn P S Cr Ni V Cu Ti Al RE 0.10 0.23 1.55 0.015 0.007 0.50 0.33 0.13 0.009 0.013 0.027 0.0011

[0064] The test results of mechanical properties of H plow steel are shown in Table 4.

[0065] Table 4H mechanical performance test results of plow steel

[0066] R e1 (MPa) R m (MPa) R e1 / R m A(％) a KV (transverse direction, -40℃, J / cm 2 ) organize 535 722 0.74 26.5 119 ferrite + pearlite

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Abstract

The invention relates to rare earth containing H profile steel with high strength and high toughness and a production method thereof, and belongs to the technical field of metallurgy and moulding. The raw material comprises 90wt% of blast furnace molten iron and 10wt% of high quality steel scrap. The casting blank comprises the following components in percentage by weight: 0.07-0.12% of C, 0.10-0.30% of Si, 1.40-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.30-0.60% of Cr, 0.20-0.50% of Ni, 0.06-0.20% of V, 0.01-0.03% of Ti, 0.01-0.01% of Al, 0.0005-0.010% of rare earth element RE, less than 0.10% of Cu and the balance of Fe and microelements which cannot be detected. The process flow is as follows: molten iron pre-treatment; smelting by a top-bottom combined blowing converter; refining by an LF (Ladle Furnace); VD (Vapor Distillation) vacuum treatment; continuous casting of square billets; cutting; heating the casting blank; dephosphorization by high pressure water; BD1 cogging; BD2 central rolling; dephosphorization by high pressure water; CCS (Cold Crushing Strength) universal rolling; straightening; cooling; flaw detection; and saw cutting. The mechanical properties of the steel are as follows: the yield strength is 490-570MPa, the strength of extension is 660-750Mpa, the yield ratio is greater than or equal to 0.80, the ductility is greater than or equal to 25%, and the horizontal impact value: aKV is greater than or equal to 100J/cm<2> (minus 40 DEG C). The product provided by the invention has the characteristics of low content of impurity elements, high strength, good toughness and excellent welding performance.

Description

1. Technical field: [0001] The invention belongs to the field of ferrous metal smelting and metal pressure processing, and relates to a rare earth-containing high-strength and high-toughness H-shaped steel and a production method thereof. 2. Background technology: [0002] H plow steel is an economical section plow steel, which is widely used in bridges, high-rise buildings, lifting equipment, structural supports and foundation piles, etc. Compared with I-beam, it has the advantages of large section modulus and light weight. Because the inside and outside of its legs are parallel, it can be assembled and combined conveniently. Under the condition of bearing the same load, H-shaped steel saves 10% to 15% of steel than I-shaped steel. In recent years, H-shaped steel has developed towards high strength, high toughness, and excellent welding performance, while traditional H-shaped steel can no longer meet these requirements in terms of strength, toughness, and welding performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/58C22C33/04B22D11/115B21B1/088C21D8/00
CPCY02P10/20
Inventor 皮亚明
Owner INNER MONGOLIA BAOTOU STEEL UNION
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