30Mn*280 orbit square steel cold drawing deformation aging heat processing technique for large-scale port machine

A technology of aging heat treatment and normalizing heat treatment, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as size deviation, achieve good surface quality, improve hardness and wear resistance, and good comprehensive mechanical properties

Inactive Publication Date: 2009-11-11
江阴界顺金属科技有限公司
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Problems solved by technology

[0007] 2. Size tolerance

Method used

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  • 30Mn*280 orbit square steel cold drawing deformation aging heat processing technique for large-scale port machine
  • 30Mn*280 orbit square steel cold drawing deformation aging heat processing technique for large-scale port machine
  • 30Mn*280 orbit square steel cold drawing deformation aging heat processing technique for large-scale port machine

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Embodiment Construction

[0027] see figure 1 , the invention is a 30Mn 2 80 track square steel cold-drawing deformation aging heat treatment process, firstly, the hot-rolled square steel billet is normalized in a continuous furnace, the normalizing heat treatment temperature is 860-880 ° C, the holding time is 40 minutes ± 5 minutes, air-cooled to room temperature, and then, the second One cold drawing, the elongation coefficient μ is controlled at 1.04-1.05, and then the aging heat treatment is carried out when the second continuous drawing reaches the finished product size of 80*80, the total elongation coefficient μ is controlled at 1.09-1.1, the aging heat treatment temperature is 400-450°C, and heat preservation Time 90 minutes ± 10 minutes, air cooling. The specific discussion is as follows.

[0028] 1. Grinding of hot-rolled square billets

[0029] Grinding is one of the key processes to ensure the surface quality of track square steel. Defects such as cracks, warped skins, and pits on the ...

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Abstract

The invention relates to a cold-drawn deformation aging heat treatment process for 30Mn280 track square steel used in large-scale port machinery. First, the hot-rolled square steel billet is subjected to normalizing heat treatment in a continuous furnace, the normalizing heat treatment temperature is 860-880°C, and the holding time is 40 minutes ± 5 Minutes, air-cooled to room temperature, then, the first cold drawing, the elongation coefficient μ is controlled at 1.04-1.05, and then the aging heat treatment is carried out when the second continuous drawing reaches the finished size of 80*80, the total elongation coefficient μ is controlled at 1.09-1.1, Aging heat treatment temperature 400-450 ℃, holding time 90 minutes ± 10 minutes, air cooling. The process of the present invention can not only meet the requirements of track square steel with high strength index, hardness and wear resistance, but also have good plasticity index A5, good comprehensive mechanical properties of Ψ, and can also meet the high dimensional accuracy and high precision of track square steel. surface quality requirements.

Description

technical field [0001] The invention relates to a rail square steel used for container lifting port equipment, in particular to a 30Mn rail steel used for large port machinery. 2 New process of cold-drawing deformation aging heat treatment for 80 track square steel. The invention belongs to the technical field of steel rolling heat treatment compounding. Background technique [0002] Large port machinery and equipment, its 30Mn 2 The 80 track square steel is one of the key components that mainly bear the full weight of the mobile crane. The hoisting load should be transmitted to the large steel structure through the track square steel and then to the ground. For long-term stable operation, the track square steel should have accurate dimensions and have good comprehensive mechanical properties and wear resistance. The 36m long track consists of Several square steels are welded into an integral track, and they should also have good welding process performance to meet the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D1/00C21D1/28C21D11/00
Inventor 薛建良陈培弟邓尔康
Owner 江阴界顺金属科技有限公司
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