40Mn2B alloy structural steel material

A technology of alloy structural steel and chemical composition, which is applied in the field of alloy structural steel materials, can solve problems such as low cost, reduced quenching crack sensitivity, and insufficient hardenability, and achieve low cost, small quenching crack sensitivity, and heat treatment process good sex effect

Inactive Publication Date: 2013-10-30
DONGFENG DANA AXLE
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Problems solved by technology

[0003] In order to overcome the lack of hardenability or easy cracking of medium carbon alloy steel in the production of automobile parts, the purpose of the present invention is to provide a 40Mn2B alloy structural steel material, which is improv

Method used

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Example Embodiment

[0007] The invention adopts electric arc furnace or converter smelting.

[0008] Key points of the process of smelting 40Mn2B alloy structure in electric arc furnace.

[0009] (1) The charge is composed of 10-30% low-phosphorus pig iron and 70-90% clean steel scrap. The ingredient carbon should ensure that the carbon content after full melting is more than 0.30% higher than the specified lower limit. In order to reduce the gas in steel when using the return method for smelting, the decarburization amount is more than 0.10%.

[0010] (2) The oxidation is carried out by mixing ore and oxygen. The ore is added first and then the oxygen is blown. The oxidation starting temperature should be higher than 1480℃, the film formation time should be longer than 30s, and the decarburization amount should not be less than 0.30%.

[0011] (3) After the thin slag is formed, pre-deoxidize 0.5-1.0Kg / t, add 2-3Kg / t of calcium carbide, 1-2kg / t of carbon powder, and close the furnace door for 7-15min.

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Abstract

The invention discloses a 40Mn2B alloy structural steel material, which is used for manufacturing alloy structural steel with high hardenability and low hardening break sensitivity. The 40Mn2B alloy structural steel material comprises the following chemical components in percentage by weight: 0.37-0.42 percent of C, 0.17-0.37 percent of Si, 1.40-1.70 percent of Mn, 0.20-0.60 percent of Cr, 0.0010-0.0035 percent of B, 0.015-0.045 percent of Ti, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, less than or equal to 0.06 percent of Mo, less than or equal to 0.15 percent of Ni and less than or equal to 0.25 percent of Cu. The hardness of the 40Mn2B alloy structural steel material can reach J13/50-60 HRC, the tempering hardness of 217-269 HB can be reached in a normalized condition, the effective hardened layer depth of 10-16mm can be achieved for shaft type parts, the cost is lower than that of the 42CrMo material, the hardening break sensitivity is low, and the thermal treatment processibility is good.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to an alloy structural steel material suitable for manufacturing high hardenability and low quenching crack sensitivity. Background technique [0002] At present, among the medium-carbon alloy structural steels used for auto parts in China, 40MnB, 40Cr, and 42CrMo steels are mainly used. 40MnB and 40Cr steels have low hardenability, and it is difficult to achieve an effective hardening layer depth of more than 10mm for induction quenching with a diameter of φ60-80. , there is the defect of insufficient hardenability, which cannot meet the technical requirements of high-level deep induction hardening; 42CrMo steel has high hardenability, and the effective hardened layer depth can reach the requirements of more than 10mm, and its hardenability meets the high-level deep induction hardening technology. Requirements, but the cost is high, and Mo steel has the risk of e...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/38C22C38/32
Inventor 高亮庆朱小清左欣荣詹嘉勇孔文曾德慧
Owner DONGFENG DANA AXLE
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