Unlock instant, AI-driven research and patent intelligence for your innovation.

Ultra-thickness low-residual-stress steel for forklift and preparation method thereof

A low-residue and specification technology, applied in the field of ultra-thick specification and low-residual-stress forklift steel and its preparation, to achieve the effects of improving material utilization, eliminating residual stress and excellent overall performance

Pending Publication Date: 2021-11-05
LAIWU STEEL YINSHAN SECTION CO LTD
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, there are few reports on ultra-thick and low-residual-stress forklift steel plates and their manufacturing methods

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ultra-thickness low-residual-stress steel for forklift and preparation method thereof
  • Ultra-thickness low-residual-stress steel for forklift and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044]According to the embodiments of the present invention, steel for forklifts with ultra-thickness specifications and low residual stress and a preparation method thereof are provided. By weight percentage, forklift steel includes the following components: 0.12%≤C≤0.15%, 0.15%≤Si≤0.30%, 1.35%≤Mn≤1.45, 0≤S≤0.010%, 0≤P≤0.018%, 0.012% ≤Nb≤0.035%, 0.020%≤Cr≤0.030%, 0.010%≤Ti≤0.020%, 0.015%≤Als≤0.040%, the rest is iron and unavoidable impurities, and Als is acid-soluble aluminum. The forklift steel has 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, Cr, Ti microalloying composition design to ensure that the steel plate has easy weldability.

[0045] The composition content control and function of the low residual stress forklift steel of the present invention will be further described below.

[0046] Based on the ingredients provided by th...

Embodiment 1

[0072] By weight percentage, forklift steel includes the following components: C: 0.135%, Si: 0.19%, Mn: 1.38%, P: 0.016%, S: 0.004%, Nb: 0.022%, Cr: 0.24%, Ti: 0.010% , Als: 0.016%, the balance is iron and unavoidable impurities.

[0073] A method for manufacturing steel for forklifts containing the above components, the production process includes the following steps:

[0074] 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.

[0075] 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

[0085] By weight percentage, forklift steel includes the following components: C: 0.140%, Si: 0.21%, Mn: 1.40%, P: 0.015%, S: 0.003%, Nb: 0.020%, Cr: 0.25%, Ti: 0.015% , Als: 0.025%, the balance is iron and unavoidable impurities.

[0086] A method for manufacturing steel for forklifts containing the above components, the production process includes the following steps:

[0087] 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.

[0088] 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
yield strengthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses an ultra-thickness low-residual-stress steel for a forklift and a preparation method thereof. The low-residual-stress steel for the forklift comprises the following chemical components of, in percentage by weight, larger than or equal to 0.12% and less than or equal to 0.15% of C, larger than or equal to 0.15% and less than or equal to 0.30% of Si, larger than or equal to 1.35% and less than or equal to 1.45% 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 0.012% and less than or equal to 0.035% of Nb, larger than or equal to 0.020% and less than or equal to 0.030% of Cr, 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 0.040% of Als and the balance of iron and inevitable impurities, Als is acid-soluble aluminum, and the low residual stress ensures that the steel plate does not deform when a user cuts and welds.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a forklift steel with ultra-thickness specifications and low residual stress and a preparation method thereof. Background technique [0002] Residual stress refers to the self-equilibrium internal stress that remains in the object after the external force or uneven temperature field is eliminated. Both machining and strengthening processes can cause residual stress, such as cold drawing, bending, cutting, rolling, shot peening, casting, forging, welding and metal heat treatment. Residual stress is generally harmful. For example, after improper heat treatment, welding or cutting of parts, residual stress will cause parts to warp or twist, or even crack. The existence of residual stress sometimes does not appear as a defect immediately, but when the total stress exceeds the strength limit due to the superposition of working stress and residual stress in the part during work,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/28C22C38/06C22C33/06C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/26C22C38/28C22C38/06C22C33/06C21D8/0226C21D8/0247C21D1/18Y02P10/20
Inventor 李艳王中学麻衡杜传治于全成霍孝新倪凯李文强王月香何康刘俊宝
Owner LAIWU STEEL YINSHAN SECTION CO LTD