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On-line quenching and plate shape controlling technology for 12MnNiVR steel plate

A technology of shape control and steel plate, applied in manufacturing tools, tail end control, metal rolling, etc., can solve problems such as low cooling efficiency, and achieve the effect of improving cooling efficiency, simplifying process flow, and reducing hoisting

Active Publication Date: 2015-07-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the cooling water falls on the surface of the hot steel plate, the film boiling heat transfer area is much larger than the single-phase forced convection heat transfer area, resulting in low cooling efficiency

Method used

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  • On-line quenching and plate shape controlling technology for 12MnNiVR steel plate
  • On-line quenching and plate shape controlling technology for 12MnNiVR steel plate
  • On-line quenching and plate shape controlling technology for 12MnNiVR steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The size of the 12MnNiVR billet in this example is 220mm*2060mm*2619mm, and the size of the finished steel plate is 20.69mm*2085mm*27571mm. Considering the shot blasting process before tempering, rolling with a positive tolerance is adopted, with a total of 13 rolling passes and 7 rough rolling passes. , Finish rolling 6 passes. The schematic diagram of the layout of the double-stand medium and heavy plate rolling line is as follows figure 1 As shown, heating furnace 1, descaling box 2, 2800mm four-high reversible roughing mill 3, 2690mm four-high reversible finishing mill 4, pre-leveler 5, ultra-fast cooling system 6, hot leveler 7 are set in sequence, and the billet The specific processing steps are as follows.

[0033] (1) The chemical composition weight percent of the 12MnNiVR steel plate is: C: 0.085~0.11, Si: 0.16~0.3, Mn: 1.4~1.5, P: 0~0.013, S: 0~0.003, Cr: 0~0.08, Cu: 0~0.06, Mo: 0.08~0.13, Nb: 0~0.01, V: 0.04~0.055, Ti: 0.007~0.03, Ni: 0.22~0.26, Alt: 0.01~0...

Embodiment 2

[0057] The size of the 12MnNiVR blank in this embodiment is 220mm*2060mm*2510mm, and the size of the finished steel plate is 32.6mm*2525mm*13842mm. The operation that it adopts is basically the same as embodiment 1, and the difference is:

[0058] Also includes

[0059] (1) The chemical composition weight percentage of 12MnNiVR billet is: C: 0.0952, Si: 0.1958, Mn: 1.4301, P: 0.0117, S: 0.002, Cr: 0.0429, Cu: 0.0353, Mo: 0.0888, Nb: 0.0018, V: 0.0439, Ti: 0.011, Ni: 0.2335, Alt: 0.0196, and the rest are Fe and unavoidable impurities.

[0060] (2) Billet cold charging step: the billet is cooled for 71.9 hours before steel loading, the furnace gas temperature in the heat recovery section of heating furnace 1 is 615~989°C, the furnace gas temperature in the first heating section is 1014~1111°C, and the furnace gas temperature in the second heating section is 1110°C ~1209℃, furnace gas temperature in the third heating section 1198~1235℃, furnace gas temperature in the soaking se...

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Abstract

The invention discloses an on-line quenching and shape control process of 12MnNiVR steel plate, which comprises the steps of blank cold loading, descaling, rough rolling, finish rolling, pre-straightening and on-line quenching. In the on-line quenching step, the steel plate Enter the ultra-fast cooling system including 18 groups of cooling headers. The ultra-fast cooling system sets the water flow rate of each group of cooling headers according to the target thickness of the steel plate, and sets the regional roller speed to 0.7~1.2m / s, and the roller acceleration 0.003~0.01m / s2, the cooling start temperature is controlled to be 790~740°C, and the cooling end temperature is 180~270°C. When the cooling end temperature of the steel plate is 180~270°C, leave the ultra-fast cooling system. The invention improves the cooling uniformity, cooling efficiency and first pass rate of the online quenching steel plate, simplifies the technical process of 12MnNiVR quenching and tempering treatment, and finally improves the economic benefits of the enterprise.

Description

Technical field [0001] The invention involves an online quenching and plate -shaped control process of a 12MNNIVR steel plate. Specifically, it is an online quenching and plate -shaped control process of 12MNNIVR steel plate based on tilting jet flowing technology. Background technique [0002] As a key equipment for offline quenching treatment of medium thick boards, it provides an important platform for the production of high -quality, high -performance, and high -value -added thick boards.Since the 1990s, many domestic (thick) board factories in China have successively introduced roller furnaces-quenching units from Germany.When the quenching machine is offline, the steel plate needs to be shot and re -heated, increasing the cost of shot blasting and gas consumption.Compared with the re -heating quenching process, the direct quenching process is omitted and then heating the auscularization process, saving energy and simplifying the process process, improving production efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/18B21B37/72B21B45/02
CPCY02P70/10
Inventor 郑东升朱金宝侯中华廖仕军刘春前
Owner NANJING IRON & STEEL CO LTD
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