CN101492793B

CN101492793B - Medium-lower alloy abrasion resistant steel

Info

Publication number: CN101492793B
Application number: CN2009100941273A
Authority: CN
Inventors: 丁起
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-21
Filing date: 2009-02-21
Publication date: 2011-06-15
Anticipated expiration: 2029-02-21
Also published as: CN101492793A

Abstract

The invention discloses a medium-and low-alloy wear resisting steel. The steel comprises the following main chemical composition by weight percentage: 0.3-0.45% of C, 2-3.5% Mn, 0.05-0.2% of Ti, 0.08-0.15% of Y, 1-2.5% of Si, 0.05-0.2% of V, 0.003-0.005% of B, less than or equal to 0.045% of P, less than or equal to 0.04% of S, with the rest being Fe. The medium-and low-alloy wear resisting steel has good wear resisting property and high hardness with the Rockwell hardness ranging from 45 degrees to 55 degrees, good ductility, thereby being not easy to break, and low production cost; the medium-and low-alloy wear resisting steel can be used for producing steel balls, grinding bodies, lining boards, plate hammers and the like for large ball mills.

Description

Middle low-alloy wear-resistant steel

Technical field

The present invention relates to a kind of alloy material, more particularly, relate to a kind of middle low-alloy abrasion-proof steel.

Background technology

Wearing and tearing are department's ubiquities such as mine, cement, fuel-burning power plant, phosphorus ore and cause equipment failure or the major cause of material breakage, also are to cause one of maximum problem of financial loss.And pulverize in the mechanical means of grinding at material, grinding element is indispensable supporting machinery product.At present most of grinding element that uses all is the chromium ball, and the chromium ball has excellent abrasive, but it has the following disadvantages: 1. alloying element content height, production cost height; 2. poor toughness, easy fracture, easily broken; 3. lose circle easily.

Summary of the invention

The object of the present invention is to provide a kind of hardness height, wear resistance is good, good toughness, easy fracture not, the middle low-alloy wear-resistant steel that production cost is low.

For achieving the above object, the present invention is achieved by the following technical solutions:

The low-alloy wear-resistant steel main chemical by weight percentage in of the present invention: carbon (C) 0.2～0.5%, manganese (Mn) 1.8～3.8%, titanium (Ti) 0.04～0.25%, Yttrium base rare earth (Y) 0.07～0.18%, silicon (Si) 0.8～2.8%, alum (V) 0.04～0.25%, boron (B) 0.002～0.007%, phosphorus (P)≤0.05%, sulphur (S)≤0.045%, all the other are iron (Fe).

Carbon (C): carbon content is bigger to alloy abrasion resistant steel tissue and performance impact, and alloy wear-resisting cast steel generally all uses under the Q-tempering state, under the constant prerequisite of other alloying element, changes carbon content, and the variation of essence can take place for its tissue and performance.

Silicon (Si): but silicon strongly inhibited carbide separate out and make rich carbon austenitic have high stability, the toughness of steel is significantly improved, but silicon is too high, the impelling strength of steel is descended.

Manganese (Mn): be main strengthening element, major part is dissolved in ferrite, strengthens matrix, reduces the carbide speed of separating out, improve the hardening capacity of steel, increase wear resistance, but cross thermo-responsive element, the temperature of quenching is too high, can cause that crystal grain is thick, increases the temper brittleness tendency of steel.

Vanadium (V): vanadium is a grain-refining agent, is strong carbide forming element, can improve in wear resisting steel and mould row, toughness, cooperates with Ti, is improving a lot than wear-resistant grinding abrasion performance under the high impact loads.

Titanium (Ti): titanium is a strong type phosphide element, crystal grain thinning.

Boron (B): improve the hardening capacity of steel strongly, improve the obdurability of steel.

Yttrium base rare earth (Y): but the Yttrium base rare earth cleaning molten steel used, improve the quality of steel, improve crystallization, optimize the mechanical property of tissue and increase steel.

Phosphorus (P), sulphur (S): p and s is an inevitable harmful element in the steel, should control it, makes phosphorus (P)≤0.045%, sulphur (S)≤0.04%.

The best proportioning of low-alloy wear-resistant steel main chemical is by weight percentage in of the present invention: carbon (C) 0.3～0.45%, manganese (Mn) 2～3.5%, titanium (Ti) 0.05～0.2%, Yttrium base rare earth (Y) 0.08～0.15%, silicon (Si) 1～2.5%, alum (V) 0.05～0.2%, boron (B) 0.003～0.005%, phosphorus (P)≤0.045%, sulphur (S)≤0.04%, all the other are iron (Fe).

The middle low-alloy wear-resistant steel of producing according to this prescription has following beneficial effect: 1. hardness height, and Rockwell hardness is between 45 ° to 55 °; 2. wear resistance is good; 3. good toughness, not easy fracture; 4. cost is low.

The middle low-alloy wear-resistant steel that the present invention proposes can be made different products according to the difference of heat treatment mode, as: the grinding element that steel ball, large-size ball mill are used, liner plate, bar etc.

1, produce the shredder liner plate, its production technique is: to be adjusted to branch in the stokehold according to the Chemical Composition proportioning qualified for the batching of low-alloy wear-resistant steel in 1. will producing; 2. steel scrap is dropped into the fusing of intermediate frequency furnace or electric arc furnace smelting; 3. drop into carbon, manganese, titanium, silicon, alum, boron in proportion, pyrotic smelting to 1500 ℃～1700 ℃ adds Yttrium base rare earth by proportioning during tapping; 4. casting as required; 5. finishing polishing; 6. room temperature is heated to 950 ℃, is incubated 2 hours, air quenching, 250 ℃ of tempering 4 hours.

2, produce the shredder grinding element, its production technique is: to be adjusted to branch in the stokehold according to the Chemical Composition proportioning qualified for the batching of low-alloy wear-resistant steel in 1. will producing; 2. steel scrap is dropped into the fusing of intermediate frequency furnace or electric arc furnace smelting; 3. drop into carbon, manganese, titanium, silicon, alum, boron in proportion, pyrotic smelting to 1500 ℃～1700 ℃ adds Yttrium base rare earth by proportioning during tapping; 4. technology cast such as mould or continuous caster, Sha Mo disappear; 5. finishing polishing; 6. forge and press balling-up.

The wear-resisting ball percentage of damage of producing according to this prescription is little, can not build mill, stifled mill, can improve the long-term unit-hour output of grinding machine of 5%-8%; From being ground to the little circle that do not lose greatly, bead can be reused tail storehouse or fine grinding.

Embodiment

The present invention is described further below in conjunction with the specific embodiment of producing grinding element, and each Chemical Composition is counted by weight percentage:

Claims

1. low-alloy wear-resistant steel in a kind is characterized in that its Chemical Composition is by weight percentage: carbon 0.45%, manganese 3.5%, titanium 0.2%, Yttrium base rare earth 0.15%, silicon 2.5%, alum 0.2%, boron 0.005%, phosphorus 0.04%, sulphur 0.045%, iron 92.91%.