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Vacuum electron beam assembly welding process for high-carbon-equivalent super-thick composite blank

A technology of vacuum electron beam and high carbon equivalent, which is applied in the direction of electron beam welding equipment, welding equipment, manufacturing tools, etc., which can solve the problems of poor actual effect and achieve the effect of low production cost and strong operability

Active Publication Date: 2019-12-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The Chinese patent with the publication number CN 105252237A discloses "a production method of a CrMnNiMo series extra-thick mold composite blank", trying to fix the composite blank by symmetrical spot welding to prevent welding cracking, which cannot fundamentally solve the problem of medium-carbon high-alloy molds. Welding cracking problems caused by steel internal stress and thermal stress, the actual effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, the material of the high carbon equivalent extra-thick composite billet is 1.2311, the size of the composite billet is 600mm (thickness) × 2000mm (width) × 4200mm (length), and the thickness of the finished plate is 300mm; the blank assembly welding process is as follows:

[0039] 1. Surface processing: Strictly control the surface processing quality of the blank. The cutting depth of the last milling process of the milling surface is 2mm, and the milling speed is 100mm / min, which effectively guarantees the quality of the joint surface after milling.

[0040] 2. Slab preheating; transport the assembled composite billet to the stack of continuous casting billets just off the assembly line for baking and preheating, put 4 red billets on the lower part, put the composite billet, and press 4 red billets on the upper part of the composite billet A piece of red slab; baked for 3 hours, the core temperature of the slab after preheating is 350°C.

[0041] 3. S...

Embodiment 2

[0046] In this embodiment, the material of the high-carbon-equivalent extra-thick composite billet is AGMJ50: the thickness of the composite billet is 600mm×2200mm×3800mm, and the thickness of the finished plate is 350mm. The blank welding process is as follows:

[0047] 1. Surface processing; the cutting depth of the last milling process on the milling surface is 1mm, and the milling speed is 70mm / min.

[0048] 2. Slab preheating; transport the assembled composite billets to the stack of continuous casting billets just off the assembly line for baking and preheating, put 4 red billets on the lower part, then put the composite billets, and press the upper part of the composite billets for 3 A block of red billet; baked for 4 hours, the core temperature of the composite billet after preheating is 320°C.

[0049] 3. Secondary cleaning of the surface: After the composite billet is preheated, the continuous casting materials that make up the composite billet are hoisted to the ce...

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Abstract

The invention relates to a vacuum electron beam assembly welding process for a high-carbon-equivalent super-thick composite blank. The carbon equivalent of the high-carbon-equivalent super-thick composite blank is more than or equal to 0.5 %, and the thickness of a finished product of a steel plate is 150-450 mm. The vacuum electron beam assembly welding process for the composite blank includes the following steps: 1) selecting composite blank materials, 2) processing the composite blank materials, 3) preheating the composite blank, 4) conducting secondary surface cleaning, 5) preserving heatand conducting homogenizing, 6) welding the composite blank, and 7) conducting heating in a furnace after welding. In combination with the field production process flow of a steel plant, the vacuum electron beam assembly welding process for the high-carbon-equivalent super-thick composite blank is provided to solve the technical problem that welding microcracks easily appear in the welding processof the high-carbon-equivalent super-thick composite blank, thus the generation of the welding microcracks can be effectively avoided, and the low-cost stable production of high-carbon-equivalent super-thick composite plates is realized.

Description

technical field [0001] The invention relates to the technical field of metal composite plate production, in particular to a vacuum electron beam assembly welding process for high-carbon-equivalent extra-thick composite blanks. Background technique [0002] Die steel has a very large hardening tendency, with high carbon martensite in the metallographic structure, which is very sensitive to the formation of cold cracks. At the same time, the martensite structure formed in the welding heat-affected zone makes the metal material hard and brittle, and the plasticity and toughness of the joint are greatly reduced. Therefore, the welding performance of die steel is extremely poor, and hot cracks and cold cracks are prone to occur during welding. [0003] Vacuum compound rolling technology is a new method of producing extra-thick steel plates. Compared with traditional ingot casting, it greatly improves the internal structure and performance of rolled products, and solves the probl...

Claims

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Application Information

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IPC IPC(8): B23K15/00
CPCB23K15/0006B23K15/0033B23K15/0046
Inventor 马成金百刚刘文飞李超苏小利韩旭范刘群王若钢鲁强
Owner ANGANG STEEL CO LTD