CN101713048A - Multi-element low-alloy wear-resistant steel - Google Patents

Abstract

The invention provides multi-element low-alloy wear-resistant steel, which relates to special multi-element low-alloy wear-resistant steel for manufacturing crusher hammer heads, in particular to multi-element low-alloy air-quench wear-resistant steel, namely 50SiMnCr2MoRe. In order to solve the problem of the severe wear of crusher hammer heads in the prior art, the multi-element low-alloy wear-resistant steel comprises the following element in percentage by weight: 0.46 to 0.52 percent of C, 0.8 to 1.0 percent of Si, 1.0 to 1.4 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.030 percent of S, 2.0 to 2.8 percent of Cr, 0.2 to 0.5 percent of Mo and 0.1 to 0.15 percent of Re, and the steel is manufactured through the following heat treatment of performing air quenching at 900 to 950 DEG C, tempering the obtained product to be between 250 and 300 DEG C, preserving heat for 3 hours and then naturally cooling the obtained product. As the multi-element low-alloy wear-resistant steel disclosed by the invention has high hardness and toughness, the lifespan of the crusher hammer heads manufactured from the steel is 5 times longer than common high-manganese wear-resistant steel, and the multi-element low-alloy wear-resistant steel contains no rare/noble elements and is low in price which is about two thirds of that of common high-manganese steel.

Description

A kind of multi-element low-alloy wear-resistant steel

Technical field

The present invention relates to multi-element low-alloy wear-resistant steel, particularly be exclusively used in the multi-element low-alloy wear-resistant steel of making grinder hammerhead, be specially a kind of multi-element low-alloy wind wear resisting steel---50SiMnCr that quenches ₂MoRe.

Background technology

The tup of hammer mill is worked under heavily stressed and intense impact abrasive conditions, is the main consumable accessory of crusher.Grinder hammerhead is subjected to the wearing and tearing of several forms at work, and when the tup work initial stage, its surface shape did not change, tup mainly was subjected to brinelling, and material produces viscous deformation and impact crater with positive force bump metallic surface; When the wearing and tearing of the working face of tup for after the cambered surface, variation has taken place in its surface stressed, this moment tup except being subjected to the material impacting wearing and tearing, also be subjected to plow and crackle that material causes washing away of it and peel off.Therefore, the hardness that improves the tup material must help the raising of its wear resistance, and material is alleviated the plow phenomenon of metallic surface.The toughness that improves material can suppress the germinating and the expansion of crackle, helps to reduce the formation of fatigue flake, thereby improves wear resistance.

The most of high mangaenese steel material of using of at present domestic grinder hammerhead, tup stands brinelling and erosive wear during broken material, the impact that often is subjected to is not strong, can not fully be brought into play thereby the processing that high mangaenese steel has is rigid, therefore the high mangaenese steel tup shows quick abrasion, the weakness that work-ing life is short.Multi-element low-alloy steel wear resisting steel is owing to have higher hardness and enough flexible over-all propertieies, and by adjusting composition and thermal treatment process, in inner control hardness and flexible rational Match in a big way, can satisfy the needs of different wear working conditions, thereby caused people's extensive attention as high-abrasive material, close wear resisting steel owing in the selection of metal component, content and thermal treatment process mode, have defective but existing multielement is low, multiple wear pattern in the time of can not tackling tup work causes tup serious wear in use.

Summary of the invention

For solving the problem of the wear resisting steel serious wear of grinder hammerhead in the prior art, the invention provides a kind of multi-element low-alloy wear-resistant steel.

The technical solution used in the present invention is: a kind of multi-element low-alloy wear-resistant steel comprises the element of following weight percent: C 0.46-0.52%, Si 0.8-1.0%, Mn 1.0-1.4%, P≤0.035%, S≤0.030%, Cr2.0-2.8%, Mo 0.2-0.5%, Re 0.1-0.15%; And carry out following thermal treatment and make: quench at 900 ℃～950 ℃ wind, be tempered to 250 ℃～300 ℃ insulations 3 hours, then naturally cooling.

Test shows, Wear Resistance of Metal Materials is a composite factor index, with the hardness and the toughness of material confidential relation is arranged all, the fret wear amount of high rigidity, high tenacity is few, but the hardness of material and tough closely related generally speaking, hardness was lower when toughness was high, toughness lower again (the minority steel alloy removes the place) when hardness is high.Its wear resistance of differing materials that hardness is identical is discrepant, and the differing materials wear resistance that toughness is identical is also inequality, therefore, is the key that improves wear resistance to the selection of material category and the rational proportion of content.The toughness of thermal treatment process and material, hardness have complicated relation equally, and the relation of quenching temperature and changes in hardness is parabolic type, and experiment shows that quenching temperature hardness in the time of 900 ℃～950 ℃ is the highest, reaches peak value in the time of 920 ℃.Owing in the hardened steel bigger unrelieved stress is arranged, so the intensity of quenching attitude is minimum.Along with the rising of tempering temperature, unrelieved stress is eliminated gradually and intensity is risen, and occurs peak value when rising to 250 ℃～300 ℃.The present invention has found out an accurate constituent content of cover and has matched with the thermal treatment process of uniqueness on the bases of a large amount of experiments, has drawn a kind of being exclusively used in and has made the right multi-element low-alloy wear-resistant steel of crusher hammer.

Multi-element low-alloy wear-resistant steel disclosed by the invention has higher hardness and toughness, hardness (HRC) 50-53, and yield strength is 1200-1600MPa, and fracture toughness is 1100-1280MPa, and elongation is 2.4-3.0, and impact toughness is 34-45J/cm ²The grinder hammerhead of making is than 5 times of common high manganese wear-resistant steel long service life, and is on probation in Yangquan City Ji Shan dressing-works, and operation just must be changed in 5 hours on the common high mangaenese steel tup Large Crusher, and 50SiMnCr of the present invention ₂The MoRe tup can use 20-30 hour at least.High silicomanganese multi-element low-alloy steel wear resisting steel does not contain rare your element, and is cheap, is about 2/3 of common high mangaenese steel.

Embodiment

A kind of multi-element low-alloy wear-resistant steel of the present invention, the element that comprises following weight percent: C 0.46% (or 0.52% or 0.47% or 0.48% or 0.49% or 0.50% or 0.51), Si 0.8% (or 1.0% or 0.9%), Mn 1.0% (or 1.4% or 1.1% or 1.2% or 1.3%), P≤0.035%, S≤0.030%, Cr 2.0% (or 2.8% or 2.1% or 2.2% or 2.3% or 2.4% or 2.5% or 2.6% or 2.7%), Mo 0.2% (or 0.5% or 0.3% or 0.4%), Re 0.1% (or 0.15% or 0.11% or 0.12% or 0.13% or 0.14)

And carry out following thermal treatment and make: quench at 900 ℃～950 ℃ wind, be tempered to 250 ℃～300 ℃ insulations 3 hours, then naturally cooling.

During smelting, adopt the useless medium carbon steel that reclaims as raw material, and by adding ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, rare earth (adopting rare earth steel, rare earth magnesium usually), contain C, S, P amount in the selected raw material and will be lower than content of the presently claimed invention, the content that technique means such as the chemical examination of technician by routine, calculating are regulated each element reaches required requirement.

Claims (1)

1. multi-element low-alloy wear-resistant steel is characterized in that comprising the element of following weight percent: C0.46-0.52%, Si 0.8-1.0%, Mn 1.0-1.4%, P≤0.035%, S≤0.030%, Cr 2.0-2.8%, Mo 0.2-0.5%, Re 0.1-0.15%; And carry out following thermal treatment and make: quench at 900 ℃～950 ℃ wind, be tempered to 250 ℃～300 ℃ insulations 3 hours, then naturally cooling.