CN1904117A

CN1904117A - Medium carbon low alloy steel for light high speed train wheel

Info

Publication number: CN1904117A
Application number: CN 200510118305
Authority: CN
Inventors: 江波; 崔银会; 陈刚; 龚志翔; 张建平; 王健; 安涛
Original assignee: Maanshan Iron and Steel Co Ltd
Current assignee: Maanshan Iron and Steel Co Ltd
Priority date: 2005-07-30
Filing date: 2005-10-26
Publication date: 2007-01-31
Anticipated expiration: 2025-10-26
Also published as: CN100374606C

Abstract

This invention relates to a type of midst-carbon and low-alloy steel which used for wheel of light super-speed railroad train. Account for weight it includes : 0.40-0.50%C 0.20-0.70%Si 0.50-0.80%Mn 0.20-0.30%Cr 0.015-0.035%Als S<=0.02% P<=0.02%,the rest is Fe and impurity element. The invention lowers the carbon inside steel, increases the Si, and adds trace quantity Al and Cr. Compared with the background technology, this invention has better property but lower cost.

Description

A kind of light high speed train wheel medium carbon low alloy steel

Technical field

The invention belongs to railroad train wheel low alloy steel, relate in particular to the railway high speed train wheel low alloy steel that overall trip speed 〉=200km, axle weigh 14.5 tons, the diesel locomotive of off tread braking or electriclocomotive traction.

Background technology

Wheel is the important moving member of train.Wheel contacts with rail in train travelling process all the time, plays effects such as carrying, transferring power and braking.The wearing and tearing of wheel, fatigue and physical abuse directly influence the work-ing life and the traffic safety of wheel.Result of study shows, after train running speed surpasses 120km/h, and the dynamic conditions of train and working conditions generation noticeable change.Along with travelling speed is accelerated, wearing and tearing aggravation between wheel and the rail, in train operation particularly in braking procedure, produce a large amount of heat of friction, aggravated the Problem of Failure that wheel and rail cause because of tired, peel off etc., bring great hidden danger for the safe operation of train, increased the railway cost of overhaul, even security incident takes place.In order to adapt to the demand of train high-speed cruising, various countries research and develop new wheel-use steel material one after another, and have obtained certain achievement, especially Japanese and European France, Germany, but the technological line difference that their adopt.Japan adopts high-carbon carbon steel, and its alloying element and degree are: 0.60-0.75%C 0.15-0.35%Si0.50-0.90%Mn S≤0.50% P≤0.045% Cu≤0.30%.Its performance is: normal temperature wheel rim tensile strength is at 970～1077N/mm ², This wheel strength height, but toughness is relatively poor, and the problem of existence is a heat resistanceheat resistant damage ability, wheel tread takes place peel off the probability height, increases maintenance cost.The non-alloying steel of carbon during then adopt in Europe, its alloying element and degree: C≤0.52% Si≤0.40% Mn≤0.80% S≤0.020% P≤0.020%Cr≤0.30% Cu≤0.30% Mo≤0.08% Ni≤its performance of 0.30% V≤0.06% is: normal temperature wheel rim tensile strength is at 820～940N/mm ²,

This Wheel Steel intensity, toughness are mated relatively poor, and when wheel rim tensile strength reached 880～940N/mm2, the normal temperature ballistic work was less than 20J, and-20 ℃ of low-temperature impact works are less than 10J, and fracture toughness property approximates

Wheel tread takes place and peels off the probability height in heat resistanceheat resistant damage ability, and fracture toughness property greater than

Wheel rim tensile strength is less than 880N/mm when above ², wheel is softer, and abrasion are fast, and work-ing life is short, the running cost height.

The CL60 steel 0.55-0.65%C that China adopts at present, 0.17-0.37%Si, 0.50-0.80%Mn, P≤0.035%, S≤0.040%, after travelling speed reached 120-140km/h, wheel tread was peeled off emerge in multitude, directly influenced train operating safety.

Summary of the invention

In order to overcome the deficiency that background technology exists, the purpose of this invention is to provide a kind of light high speed train wheel medium carbon low alloy steel, the light high speed train wheel made from this steel can obtain better comprehensive performance, both had good intensity, has good toughness again, to adapt to the demand of bullet train.

Carbon and low-alloy during a kind of light high-speed degree train wheel is used comprises following alloying element by weight percentage:

All the other are Fe and impurity element for 0.40-0.50%C 0.20-0.70%Si 0.50-0.80%Mn 0.20-0.30%Cr0.015-0.035%Als S≤0.02% P≤0.02%.

Determining of above-mentioned component and content is to draw carrying out on the research basis of carbon content to the influence of wheel over-all properties.In carbon content 0.70-0.40% scope, mechanical property, antiskid kinetic friction performance, anti-rolling resistance performance, thermal fatigue resistance and the anti-contact fatigue of different components material have been carried out a large amount of research.The result shows that along with the reduction of carbon content, the anti-sliding friction property of material, anti-rolling resistance performance and contact resistance fatigue property decrease, but the fatigue performance of material significantly improves.Comprehensive all results of study show that the material of carbon content about 0.50% can obtain better comprehensive performance.The present invention suitably improves the content of Si on the basis of carbon drop, add a spot of Cr, Al simultaneously.Reduce C content, help improving the toughness of wheel, and improve the Ms point; Improve Si content, can improve A _C1, A _C3Stagnation point, and certain molten admittedly strengthening effect is arranged, little to the conversion characteristic influence of supercooled austenite, and inexpensive; Cr can improve A _C1, A _C3Stagnation point, simultaneously can make steel have appropriate hardening capacity, can compensate because the loss of strength that reduction C content brings, and by the refine pearlite tissue have by force, the malleableize effect; Al forms AIN precipitate pinning crystal boundary in steel, make the austenite matrix refinement.

Light high speed train wheel is to process through following operation, by specifying said components and content,------forging and pressing------thermal treatment---machining---inspection after construction that wheel rolling mill is rolling that LF stove refining---VD vacuum-treat---continuous casting becomes the circle base, cuts base then by converter smelting.

Compare with background technology, the wheel that the present invention makes reaches 880～940N/mm in wheel rim tensile strength ²The time, the normal temperature ballistic work is greater than 25J, and-20 ℃ of low-temperature impact works are greater than 10J, and fracture toughness property surpasses And the high speed wheel in Europe reaches 880～940N/mm in intensity ²The time, the normal temperature ballistic work is less than 20J, and-20 ℃ of low-temperature impact works are less than 10J, and fracture toughness property equals Therefore the present invention can make wheel strength, toughness coupling well, obtains good comprehensive performances, has good abrasion resistance, cracking resistance line extended capability; Because A _C1, M _sPoint is higher, also has good heat resistanceheat resistant damage, anti-mechanical fatigue damage ability; Alloying element is few and inexpensive, and add-on is controlled easily, helps reducing production costs, and guarantees traffic safety.

Description of drawings (summary)

Embodiment

Further specify the present invention below by embodiment.

Embodiment 1

Adopt general smelting equipment such as converter, LF stove and VD equipment, press the component and the content of table 1 numbering 1, adopt common process for making to smelt, continuous casting becomes the circle base; Round then mold is cut into piece, heating, forging and pressing, and is rolling by wheel rolling mill; Manufacture wheel through operations such as thermal treatment, machining, inspection after constructions again.Numbering 1 has been listed its test result in the table 2.

Embodiment 2

Press the component of table 1 numbering 2 and the method that content repeats embodiment 1 respectively, produce wheel, numbering 2 has been listed its test result in the table 2.

Table 1

Numbering	C	Si	Mn	S	P	Cr	Als
Numbering	C	Si	Mn	S	P	Cr	Als	1	0.48	0.34	0.71	0.013	0.012	0.28	0.022
2	0.50	0.37	0.65	0.011	0.015	0.23	0.030	1	0.48	0.34	0.71	0.013	0.012	0.28	0.022
2	0.50	0.37	0.65	0.011	0.015	0.23	0.030	3	0.42	0.70	0.78	0.008	0.012	0.30	0.016

Embodiment 3

Press the component of table 1 numbering 3 and the method production wheel that content repeats embodiment 1 respectively, numbering 3 is listed its test result in the table 2.

Table 2

Claims

1, a kind of light high speed train wheel medium carbon low alloy steel comprises following alloying element by weight percentage:

0.40-0.50％C 0.20-0.70％Si 0.50-0.80％Mn 0.20-0.30％Cr

All the other are Fe and impurity element for 0.015-0.035%Als S≤0.02% P≤0.02%.

2, a kind of light high speed train wheel medium carbon low alloy steel according to claim 1 comprises following alloying element by weight percentage:

All the other are Fe and impurity element for 0.48%C 0.34%Si 0.71%Mn 0.013%S 0.012%P 0.28%Cr 0.022%Als

3, a kind of light high speed train wheel medium carbon low alloy steel according to claim 1 comprises following alloying element by weight percentage:

All the other are Fe and impurity element for 0.50%C 0.37%Si 0.65%Mn 0.011%S 0.015%P 0.23%Cr 0.030%Als

4, a kind of light high speed train wheel medium carbon low alloy steel according to claim 1 comprises following alloying element by weight percentage:

All the other are Fe and impurity element for 0.42%C 0.70%Si 0.78%Mn 0.008%S 0.012%P 0.30%Cr 0.016%Als