High-strength and low-temperature-resistant forklift door frame structural steel and preparing method thereof

A forklift mast and low-temperature-resistant technology, which is applied in the field of steel rolling and material metallurgy, can solve the problems of insufficient low-temperature resistance and deterioration of low-temperature resistance of high-strength steel, and achieve wide environmental adaptability, low-temperature impact toughness improvement, and reasonable cost Effect

Pending Publication Date: 2019-12-13
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technology has achieved a high index in the strength of the section steel through composition design, process control and other methods. With the improvement of the material strength, the low temperature resistance will gradually deteriorate. The low temperature resistance of high-strength steel is generally insufficient

Method used

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  • High-strength and low-temperature-resistant forklift door frame structural steel and preparing method thereof
  • High-strength and low-temperature-resistant forklift door frame structural steel and preparing method thereof
  • High-strength and low-temperature-resistant forklift door frame structural steel and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-strength and low-temperature-resistant forklift mast section steel, the material composition of which is controlled in the following range by weight percentage:

[0022] C: 0.15% to 0.20%, Si: 0.35% to 0.50%, Mn: 1.40% to 1.60%, P≤0.020%, S≤0.010%, V: 0.07% to 0.09%, Nb: 0.025% to 0.04%, Cr: 0.30%-0.45%, N: 0.011%-0.016%, O≤0.003%, and the rest are iron and unavoidable impurities.

[0023] Based on the above-mentioned preparation method of a high-strength and low-temperature-resistant forklift mast section steel, the preparation method includes the following steps:

[0024] (1) Converter smelting, using ferro-aluminum manganese for deoxidation, ferro-aluminum manganese 1.5 kg / ton of steel, adding vanadium-nitrogen alloy, ferro-niobium, and medium-carbon ferro-chromium for microalloying;

[0025] (2) LF refining, after refining and removing white slag, feed aluminum wire at one time according to the situation, after the temperature and composition of molten steel...

Embodiment 2

[0036] A high-strength and low-temperature-resistant forklift mast section steel, the material composition of which is controlled in the following range by weight percentage:

[0037] C: 0.15% to 0.20%, Si: 0.35% to 0.50%, Mn: 1.40% to 1.60%, P≤0.020%, S≤0.010%, V: 0.07% to 0.09%, Nb: 0.025% to 0.04%, Cr: 0.30%-0.45%, N: 0.011%-0.016%, O≤0.003%, and the rest are iron and unavoidable impurities.

[0038] Based on the above-mentioned preparation method of a high-strength and low-temperature-resistant forklift mast section steel, the preparation method includes the following steps:

[0039] (1) Converter smelting, using Al-Mn-Fe for deoxidation, Al-Mn-Fe 2 kg / ton of steel. Add vanadium-nitrogen alloy, ferro-niobium, and medium-carbon ferrochrome for microalloying;

[0040] (2) LF refining, after refining and removing white slag, feed aluminum wire at one time according to the situation, after the temperature and composition of molten steel meet the pouring requirements, feed ca...

Embodiment 3

[0051] A high-strength and low-temperature-resistant forklift mast section steel, the material composition of which is controlled in the following range by weight percentage:

[0052] C: 0.15% to 0.20%, Si: 0.35% to 0.50%, Mn: 1.40% to 1.60%, P≤0.020%, S≤0.010%, V: 0.07% to 0.09%, Nb: 0.025% to 0.04%, Cr: 0.30%-0.45%, N: 0.011%-0.016%, O≤0.003%, and the rest are iron and unavoidable impurities.

[0053] Based on the above-mentioned preparation method of a high-strength and low-temperature-resistant forklift mast section steel, the preparation method includes the following steps:

[0054] (1) Converter smelting, using Al-Mn-Fe for deoxidation, Al-Mn-Fe 2 kg / ton steel, adding vanadium-nitrogen alloy, ferro-niobium, and medium-carbon ferro-chrome for micro-alloying;

[0055] (2) LF refining, after refining and removing white slag, feed aluminum wire at one time according to the situation, after the temperature and composition of molten steel meet the pouring requirements, feed c...

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Abstract

The invention provides high-strength and low-temperature-resistant forklift door frame structural steel and a preparing method thereof. The forklift door frame structural steel comprises following components including, by weight percent, 0.15%-0.20% of C, 0.35%-0.50% of Si, 1.40%-1.60% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.07%-0.09% of V, 0.025%-0.04%of Nb, 0.30%-0.45% of Cr, 0.011%-0.016% of N, smaller than or equal to 0.003% of O, and the balance iron and inevitable impurities. The preparing method of the high-strength and low-temperature-resistant forklift door frame structural steel comprises converter smelting, LF refining, continuous casting, steel blank heating, rolling and cooling after rolling. According to the forklift door frame structural steel prepared through the preparing method is economical and reasonable in cost, on the premise that the high yield strength (larger than or equal to 500 MPa) of materials is guaranteed, thelow-temperature impact toughness is obviously improved, and the impact toughness reaches 70 J or above under the condition of -20 DEG C. The design requirements of users for lightweight, large loadsand long service life can be met, and wide environment adaptability is achieved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling and material metallurgy, and in particular relates to a high-strength and low-temperature-resistant forklift mast profile steel and a preparation process thereof. Background technique [0002] The mast is the most important working part of the forklift, and the performance of the mast directly determines the ability of the forklift to lift goods. The light weight, large load, long life and wide environmental adaptability of the mast have always been the goals pursued by forklift companies, and this goal can only be achieved by improving the performance of materials. The mast section steel is the main material for making the forklift mast. The mechanical properties of the mast section steel determine the overall performance of the forklift due to the weight of the load and the rolling of the rollers during the lifting process. [0003] With the improvement of the performance of forklifts, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C22C38/38C21C5/28C21C7/00C21C7/06C22C33/04
CPCC21C5/28C21C7/0006C21C7/0056C21C7/06C22C33/04C22C38/001C22C38/02C22C38/04C22C38/24C22C38/26C22C38/38
Inventor 霍喜伟杜林秀宋玉卿高彩茹纪进立张园华刘昀嘉王德彪
Owner SHANDONG IRON & STEEL CO LTD
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