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High-strength load-bearing steel for storage rack and heat treatment process of high-strength load-bearing steel

A high-strength steel and shelf technology, applied in the field of steel plates and their heat treatment processes, can solve the problems of low low-temperature toughness of steel plates, increase storage costs, and breakage of storage equipment, and achieve the effect of improving acid resistance.

Active Publication Date: 2015-06-17
SUZHOU NIUDONG PRECISION MFG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when it is used to store a high-weight cargo, the storage equipment often breaks in a short time due to insufficient transverse yield strength of the steel plate, which increases storage costs; and in some cold regions, the low-temperature toughness of the steel plate bearing the load on the shelf It is not high, and it often causes the storage equipment to break in a short time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment is a load-bearing high-strength steel for shelves. The composition and mass percentage of the steel plate are: C: 0.27%, Mn: 0.21%, Si: 0.05%, P: 0.006%, S: 0.002%, Nb: 0.09% , V: 0.04%, Ti: 0.36%, Al: 0.057%, N≤0.006%, H≤0.0002%, Cu: 0.17%, Cr: 1.7%, Mo: 0.33%, Lanthanum: 0.02%, Ce: 0.01% , Praseodymium: 0.05%, the balance is Fe and unavoidable impurities;

[0042] The first phase in the steel plate is ferrite, the second phase is pearlite, the volume percentage of the second phase is 3.5% from the surface to 1 / 4 thickness, and the volume percentage of the second phase from 1 / 4 thickness to the center is 6.0%, And no band tissue;

[0043] The average grain diameter of ferrite from the surface to 1 / 4 thickness of the steel plate is 4.5 μm, the average diameter of pearlite clusters is 5.02 μm, the average grain diameter of ferrite from 1 / 4 thickness to the center is 4.0 μm, and the average diameter of pearlite clusters is 4.0 μm. The cluster average dia...

Embodiment 2

[0050] This embodiment is a load-bearing high-strength steel for shelves. The composition and mass percentage of the steel plate are: C: 0.29%, Mn: 0.25%, Si: 0.06%, P: 0.007%, S: 0.003%, Nb: 0.10% , V: 0.05%, Ti: 0.37%, Al: 0.06%, N≤0.006%, H≤0.0002%, Cu: 0.18%, Cr: 1.7%, Mo: 0.34%, Lanthanum: 0.03%, Ce: 0.01% , Praseodymium: 0.06%, the balance is Fe and unavoidable impurities;

[0051] The first phase in the steel plate is ferrite, and the second phase is pearlite. The volume percentage of the second phase from the surface to 1 / 4 thickness is 3.7%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 6.12%. And no band tissue;

[0052] The average grain diameter of ferrite from the surface to 1 / 4 thickness of the steel plate is 4.6 μm, the average diameter of pearlite clusters is 5.1 μm, the average grain diameter of ferrite from 1 / 4 thickness to the center is 4.1 μm, and the average diameter of pearlite clusters is 4.1 μm. The average diameter...

Embodiment 3

[0058] This embodiment is a load-bearing high-strength steel for shelves. The composition and mass percentage of the steel plate are: C: 0.32%, Mn: 0.33%, Si: 0.07%, P: 0.008%, S: 0.004%, Nb: 0.11% , V: 0.06%, Ti: 0.39%, Al: 0.07%, N≤0.006%, H≤0.0002%, Cu: 0.19%, Cr: 1.9%, Mo: 0.35%, Lanthanum: 0.04%, Ce: 0.02% , Praseodymium: 0.07%, the balance is Fe and unavoidable impurities;

[0059] The first phase in the steel plate is ferrite, the second phase is pearlite, the volume percentage of the second phase is 3.8% from the surface to 1 / 4 thickness, and the volume percentage of the second phase from 1 / 4 thickness to the center is 6.2%, And no band tissue;

[0060] The average grain diameter of ferrite from the surface to 1 / 4 thickness of the steel plate is 4.7 μm, the average diameter of pearlite clusters is 5.2 μm, the average grain diameter of ferrite from 1 / 4 thickness to the center is 4.2 μm, and the average diameter of pearlite clusters is 4.2 μm. The average cluster diame...

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Abstract

The invention discloses high-strength load-bearing steel for a storage rack. The steel plate comprises the following components by mass percent: 0.27-0.32% of C, 0.21-0.33% of Mn, 0.05-0.07% of Si, 0.006-0.008% of P, 0.002-0.004% of S, 0.09-0.11% of Nb, 0.04-0.06% of V, 0.36-0.39% of Ti, 0.05-0.07% of Al, N less than or equal to 0.006%, H less than or equal to 0.0002%, 0.17-0.19% of Cu, 1.7-1.9% of Cr, 0.33-0.35% of Mo, 0.02-0.04% of lanthanum, 0.01-0.02% of cerium, 0.05-0.07% of praseodymium, and the balance of Fe and unavoidable impurities. According to the high-strength load-bearing steel disclosed by the invention, the transverse yield strength of the steel plate is greater than or equal to 230 MPa, and the steel plate is high in strength and excellent in low-temperature toughness.

Description

Technical field [0001] The invention relates to a steel plate and its heat treatment process, specifically to a shelf load-bearing high-strength steel and its heat treatment process. Background technique [0002] Storage equipment refers to technical devices and machines that can meet the needs of storing and keeping items. Storage equipment is the main symbol of the level of warehousing and logistics technology. Modern warehousing equipment embodies the development of modern warehousing and logistics technology. Shelves in warehousing equipment are relatively commonly used equipment. Due to the storage needs of special materials, the use conditions and environment of the shelves are becoming more and more demanding, and the thickness of the steel plates is required to be thicker and thicker. Correspondingly, the technology of steel plates used in warehousing equipment is required. The requirements are also constantly increasing. Especially when used to store high-weight go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C21D8/02
CPCC21D8/0247C22C38/005C22C38/02C22C38/04C22C38/06C22C38/18C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28
Inventor 邢婷王正勇
Owner SUZHOU NIUDONG PRECISION MFG TECH CO LTD
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