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Forged (rolled) abrasive austenic permanganic steel and its manufacture

A technology of high manganese steel and austenite, applied in the field of forging wear-resistant austenitic high manganese steel, can solve the problems of wide protection range, impossibility of implementation, and decrease of thermoplasticity

Inactive Publication Date: 2007-11-21
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this production method does not limit the phosphorus and sulfur content of high manganese steel or alloyed high manganese steel ingots
As we all know, the content of phosphorus and sulfur in the national standard cast high manganese steel is about 0.03%. Such high manganese steel with high phosphorus and sulfur content cannot be forged at all. The reason is that the phosphorus, sulfur and oxygen in the cast high manganese steel Such impurity elements segregate at the austenite grain boundary, and form low melting point compounds or even eutectics with manganese, so that the grain boundary of high manganese steel will be melted prematurely during high temperature forging, so its thermoplasticity will drop sharply
At the same time, the temperature range of the initial forging temperature and the final forging temperature of forging (rolling) has only a lower limit at one end, resulting in too wide a protection range, so that those skilled in the art cannot implement the invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Firstly, the molten steel of high manganese steel is smelted in an electric arc furnace, and then the VOD and AOD processes are used for refining outside the furnace to reduce the phosphorus and sulfur content in the steel to the lowest level, and 0.5% modifier is added to the molten steel before pouring. Do pouring. The chemical composition (wt%) of the billet is: C 1.12, Mn 12.5, Si 0.35, S 0.005, P 0.008, and the rest is Fe. Heat the steel ingot to 1050°C for 3 hours, then water quench. Then forging, the forging process is as follows: the heating rate of the steel ingot is 180°C / h, the heating temperature is 1200°C, the temperature is kept for 0.5h, the initial forging temperature is 1180°C, and the final forging temperature is 950°C. The final heat treatment process is: heating the steel to 1100°C for 3 hours for water toughening treatment. The size of the forging is 150×200×1500mm, and its mechanical properties are: σ b =1125MPa, σ 0.2 =686MPa, δ 5 = 42%, a K...

Embodiment 2

[0014] First of all, the raw materials used in steelmaking are carefully selected, and the content of phosphorus and sulfur is strictly controlled to ensure that the content of phosphorus and sulfur is less than 0.01%. The molten steel of high manganese steel is smelted by an intermediate frequency induction furnace, and 0.5% of compound rare earth compound is added into the ingot before pouring, and then poured. The chemical composition (wt%) of the billet is: C 1.24, Mn 13.3, Si 0.32, S 0.008, P 0.008, and the rest is Fe. Heat the steel ingot to 1050°C for 3 hours and then water quench. Then forging, the forging process is as follows: the heating rate of the steel ingot is 250°C / h, the heating temperature is 1200°C, the initial forging temperature is 1180°C, and the final forging temperature is 980°C, and it is forged into a 25kg hammer head. After forging, the forgings are directly quenched into water for water toughening treatment. The service life of the forged high man...

Embodiment 3

[0016] First of all, the raw materials used in steelmaking are carefully selected, and the phosphorus and sulfur content are strictly controlled to ensure that the phosphorus and sulfur content are less than 0.01%. The high manganese steel molten steel is smelted by an intermediate frequency induction furnace, and 0.6% modifier is added to the ingot before pouring, and then pouring is carried out. The chemical composition (wt%) of the billet is: C 1.11, Mn 13.4, Si 0.22, S 0.007, P 0.008, and the rest is Fe. Heat the steel ingot to 1050°C for 3 hours and then water quench. Then rolling, the rolling process is as follows: the heating rate of the steel ingot is 250°C / h, the heating temperature is 1200°C, the initial rolling temperature is 1180°C, and the final rolling temperature is 1000°C, and it is rolled into a steel plate with a thickness of 30mm. The steel plate is directly quenched into water for water toughening treatment. The rolled steel plate is subjected to a small ...

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PUM

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Abstract

A method for forging abrasive austenic high-manganese steel is carried out by smelting by electric furnace to obtain purified steel liquid with low phosphor and sulfur content, pouring into steel ingot, solid-solution heat treating, forging with temperature between 900-1180 degree and heating speed<300 degree / h, solid-solution treating by forged tailed heat, re-heating to austenic temperature, normal solid-solution treating as forger final heat treatment to obtain single-phase austenic tissue. The austenic high-manganese steel consists of C 1.0-1.3 wt%, Mn 10.0-13.0 wt%, Si<0.5 wt%, S<0.01 wt%, P,0.01 wt%, modifier 0.2-0.6 wt% and Fe residues. sigmab>=1000 MPa, sigmas>=600 MPa, delta5>=30%, aKU>=250J / cm 2. It has better impact, wear and roller contact fatigue resistances.

Description

technical field [0001] The invention relates to a forged (rolled) wear-resistant austenitic high-manganese steel, which can be used to manufacture wear-resistant parts in metallurgy, mining, building materials and other industries, and can also be used to manufacture railway frogs. technical background [0002] The classic austenitic high manganese steel contains ~1.1% C, ~13% Mn, which was introduced by Steve Hadfield before 1882, and its Great Britain Patent No. 200 was used in castings in 1892. Because austenitic high manganese steel has high toughness and excellent work hardening ability, it shows excellent wear resistance under impact and wear conditions, so it is widely used in the production of metallurgy, mining, building materials , coal, railway, military and machinery industries use wear-resistant parts. For more than one hundred years, in order to further improve its wear resistance, people have carried out a lot of theoretical research and production practice o...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/00C21C7/00B22D27/20
Inventor 张福成吕博厚如军张明王天生
Owner YANSHAN UNIV
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