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Low-cost 460MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and production method thereof

A technology of low temperature toughness and production method, applied in the direction of metal rolling, etc., can solve the problems of poor welding performance, large alloy types and additions, and high production cost, and achieve the improvement of weldability, reduction of carbon equivalent and welding crack susceptibility index. , the effect of reducing production costs

Active Publication Date: 2021-02-26
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention is a development series of weathering steel products. The alloy system is Nb, V, Ni, Cr, Cu, Al. Although the low-temperature toughness of the product is good, there are many alloy types and additions, and the production cost of this type of product is relatively high. Welding performance is poor
[0009] The above-mentioned schemes are all good explorations for low-temperature toughness hot-rolled H-beams, but there is still room for further optimization, and the exploration of low-temperature toughness hot-rolled H-beams in this industry has never stopped

Method used

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  • Low-cost 460MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and production method thereof
  • Low-cost 460MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and production method thereof
  • Low-cost 460MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A low-cost 460MPa grade excellent low-temperature toughness hot-rolled H-shaped steel of this embodiment includes the following components in weight percentage: C: 0.03%, Si: 0.20%, Mn: 1.55%, P: 0.007%, S: 0.00: 3%, V: 0.08%, Ni: 0.10%, Cr: 0.20%, N: 0.01%, and the rest is Fe and unavoidable impurities. This embodiment mainly adopts economical alloy composition design, cooperates with 460MPa level excellent low temperature toughness hot rolled H-beam austenite strengthening phase transformation technology, realizes microstructure refinement, through fine grain strengthening + solid solution strengthening + precipitation strengthening + phase transformation Combined strengthening methods such as strengthening have improved the comprehensive mechanical properties of H-beams. Specifically, it adopts the composition design of low C+V+low Ni and low Cr to realize the role of the second phase particles in fine grain strengthening, solid solution strengthening and precipitati...

Embodiment 2

[0063] A low-cost 460MPa grade excellent low-temperature toughness hot-rolled H-shaped steel of this embodiment is basically the same as that of Embodiment 1, except that it includes the following components in weight percentage: C: 0.04%, Si: 0.23%, Mn : 1.4%, P: 0.01%, S: 0.004%, V: 0.086%, Ni: 0.15%, Cr: 0.20%, N: 0.0095%, and the rest is Fe and unavoidable impurities. In this embodiment, the content ratio of V to N is 9:1; the sum of Ni+Cr is 0.35%, and the ratio of Ni:Cr is 1:1.3.

[0064] The carbon equivalent CEV of the finished H-shaped steel in this embodiment is 0.35%, and the welding crack sensitivity index Pcm is 0.14%. The structure of the H-shaped steel flange is ferrite, pearlite and bainite, the grain size of the structure is 11, the volume of ferrite accounts for 72% of the total volume, and the volume of bainite accounts for 13% of the total volume.

[0065] In this embodiment, the thickness of the flange of the H-shaped steel is 30 mm, the yield strength of...

Embodiment 3

[0069] A low-cost 460MPa grade excellent low-temperature toughness hot-rolled H-shaped steel of this embodiment is basically the same as that of Embodiment 1, except that it includes the following components in weight percentage: C: 0.04%, Si: 0.26%, Mn : 1.56%, P: 0.008%, S: 0.005%, V: 0.07%, Ni: 0.13%, Cr: 0.25%, N: 0.008%, and the rest is Fe and unavoidable impurities. In this embodiment, the content ratio of V to N is 8.8:1; the sum of Ni+Cr is 0.38%, and the ratio of Ni:Cr is 1:1.9.

[0070] The carbon equivalent CEV of the finished H-shaped steel in this embodiment is 0.37%, and the welding crack sensitivity index Pcm is 0.15%. The structure of the H-shaped steel flange is ferrite, pearlite and bainite, the grain size of the structure is 10, the volume of ferrite accounts for 75% of the total volume, and the volume of bainite accounts for 15% of the total volume.

[0071] In this embodiment, the thickness of the flange of the H-shaped steel is 42 mm, the yield strength ...

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Abstract

The invention discloses low-cost 460MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and a production method thereof, and belongs to the technical field of steel smelting.The H-shaped steel comprises the following components of, in percentage by weight, 0.03%-0.06% of C, 0.20%-0.40% of Si, 1.40%-1.60% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S, 0.07%-0.09% of V, 0.10%-0.25% of Ni, 0.10%-0.25% of Cr, 0.008%-0.010% of N and the balance Fe and inevitable impurities, wherein the content ratio of V to N is 8:1-10:1. According to the low-cost 460MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and the production method thereof, based on actual production of the hot-rolled H-shaped steel, the 460MPa-grade hot-rolled H-shaped steel with flange thickness of 30mm-50mm, high strength, high-low-temperature toughness, excellent weldability and thickness direction performance is developed through a reasonable component proportion and a full-flow TMCP technology.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and more specifically relates to a low-cost 460MPa grade excellent low-temperature toughness hot-rolled H-shaped steel and a production method thereof. Background technique [0002] In recent years, the rapid development of the world economy has exacerbated the global energy crisis. The exploitation of energy such as oil and natural gas has shifted from areas with favorable environmental conditions to the Arctic area with harsh climates, and gradually extended from land to offshore and deep seas. The Arctic region is rich in natural resources, especially oil and natural gas resources. The proven oil and gas resources exceed 412 billion barrels (54.5 billion tons) of oil equivalent, and its oil and natural gas reserves account for 13% and 30% of the world's total respectively. , is an important strategic area for future oil and gas exploration and development. [0003] Since the A...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/46C22C38/58C21D8/00B21B1/088
CPCC22C38/02C22C38/04C22C38/46C22C38/58C21D8/005B21B1/088C21D2211/005C21D2211/009C21D2211/002
Inventor 邢军吴保桥张建夏勐黄琦汪杰吴湄庄彭林彦井成丁朝晖何军委陈辉
Owner MAANSHAN IRON & STEEL CO LTD
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