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High-strength and high-toughness forklift steel with thickness specification of 10-60 mm and preparation method thereof

A high-strength, high-toughness technology, applied in the field of iron and steel smelting, can solve problems such as low product performance qualification rate, achieve the effect of improving material utilization, good economic and social benefits, and reducing alloy costs

Active Publication Date: 2021-10-01
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also controlled rolling + controlled cooling + normalizing processes that do not use Ni and Cr composition systems, but the qualified rate of product performance obtained by this technology is low

Method used

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  • High-strength and high-toughness forklift steel with thickness specification of 10-60 mm and preparation method thereof
  • High-strength and high-toughness forklift steel with thickness specification of 10-60 mm and preparation method thereof

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preparation example Construction

[0040] According to an embodiment of the present invention, a high-strength low-temperature-resistant forklift steel with a thickness of 10-60 mm and a preparation method thereof are provided. By weight percentage, forklift steel includes the following components: 0.16%≤C≤0.18%, 0.15%≤Si≤0.30%, 1.45%≤Mn≤1.55%, 0≤S≤0.010%, 0≤P≤0.018%, 0.025 %≤Nb≤0.045%, 0.030%≤V≤0.050%, 0.010%≤Ti≤0.020%, 0.015%≤Als≤0.055%, the rest is iron and unavoidable impurities, and Als is acid-soluble aluminum. The minimum value of impact toughness at a temperature of -5°C is ≥150J. The steel for forklifts has low cost, excellent low-temperature impact toughness, and excellent comprehensive properties such as product strength, elongation after fracture, and cold bending performance. And it adopts low C+Nb, V, Ti microalloying composition design to ensure that the steel plate has easy weldability.

[0041] The composition content control and function of the high-strength and low-temperature-resistant for...

Embodiment 1

[0069] By weight percentage, forklift steel includes the following components: C: 0.165%, Si: 0.20%, Mn: 1.50%, P: 0.015%, S: 0.005%, Nb: 0.040%, V: 0.035%, Ti: 0.015% , Als: 0.025%, the balance is iron and unavoidable impurities.

[0070] A method for manufacturing steel for forklifts containing the above components, the production process includes the following steps:

[0071] 1) Pretreatment, hot metal desulfurization strictly implement the process regulations, the sulfur in the hot metal is controlled at 0.008%, the temperature is 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization.

[0072] 2) Smelting, the pretreated molten iron enters the converter for smelting, the slagging material is added 3 minutes before the end point, the final slag basicity is controlled at R=3.0, and the end point pressure gun time is 65s. Almanganese iron is used for deoxidation, and the amount of aluminum manganese iron added is 2.5kg / t. When the molten stee...

Embodiment 2

[0080] By weight percentage, forklift steel includes the following components: C: 0.166%, Si: 0.21%, Mn: 1.46%, P: 0.017%, S: 0.003%, Nb: 0.029%, V: 0.040%, Ti: 0.018% , Als: 0.026%, the balance is iron and unavoidable impurities.

[0081] A method for manufacturing steel for forklifts containing the above components, the production process includes the following steps:

[0082] 1) Pretreatment, hot metal desulfurization strictly implement the process regulations, the sulfur in the hot metal is controlled at 0.008%, the temperature is 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization.

[0083] 2) Smelting, the pretreated molten iron enters the converter for smelting, the slagging material is added 3 minutes before the end point, the final slag basicity is controlled at R=3.5, and the end point pressure gun time is 70s. Almanganese iron is used for deoxidation, and the amount of aluminum manganese iron added is 2.0kg / t. When the molten stee...

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Abstract

The invention provides a high-strength and high-toughness forklift steel with thickness specification of 10-60 mm and a preparation method thereof. The high-strength and high-toughness forklift steel comprises the following chemical components in percentage by weight: larger than or equal to 0.16% and less than or equal to 0.18%of C, larger than or equal to 0.15% and less than or equal to 0.30% of Si, larger than or equal to 1.45% and less than or equal to 1.55% of Mn, larger than or equal to 0 and less than or equal to 0.010% of S, larger than or equal to 0 and less than or equal to 0.018% of P, larger than or equal to 0.025% and less than or equal to 0.045% of Nb, larger than or equal to 0.030% and less than or equal to 0.050% of V, larger than or equal to 0.010% and less than or equal to 0.020% of Ti, larger than or equal to 0.015% and less than or equal to 0.055% of Als and the balance of iron and inevitable impurities, wherein Als is acid-soluble aluminum; the high strength means that the upper yield strength is larger than or equal to 460 MPa, and the tensile strength is 570-720 MPa; and the high toughness means that the longitudinal V-shaped impact energy value at-5 DEG C is larger than or equal to 150J.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a high-strength and high-toughness forklift steel with a thickness specification of 10-60 mm and a preparation method thereof. Background technique [0002] Forklift is an industrial handling vehicle, which is widely used in ports, stations, airports, freight yards, factory workshops, warehouses, distribution centers and distribution centers, etc. It plays a very important role in the logistics system of the enterprise and is the main force in material handling equipment. The forklift mast mainly adopts hot-rolled section steel, but with the continuous upgrading of domestic forklift products and the continuous and rapid development of the forklift industry, higher requirements for high strength, high toughness and high precision are put forward for the steel used, so the strength level of the section steel used has been changed. It cannot meet the existing requirements, an...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C33/06C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C33/06C21D8/0205C21D8/0226C21D8/0247C21D1/18
Inventor 李艳王中学麻衡霍孝新倪凯李文强张长宏王腾飞陈爱娇何康刘俊宝
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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