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 the problem of low cooling efficiency, and achieve the effect of improving cooling efficiency, reducing hoisting, and reducing water consumption

Active Publication Date: 2014-02-05
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 on-line quenching and plate shape controlling technology for a 12 MnNiVR steel plate, comprising: a blank material cold installation step, a de-scaling step, a rough rolling step, a finish rolling step, a pre-straightening step and an on-line quenching step; wherein in the on-line quenching step, the steel plate enters a ultrafast cooling system with 18 groups of cooling headers, the ultrafast cooling system sets a water flow amount based on the steel plate target thickness, sets an area roller-way speed being 0.7-1.2m/s, sets a roller-way acceleration being 0.003-0.01m/s2, controls a cooling start temperature being 790-740 DEG C, and controlling a cooling final temperature being 180-270 DEG C, and the steel plate departs from the ultrafast cooling system when a cooling final temperature is 180-270 DEG C. The technology provided by the invention raises cooling uniformity, cooling efficiency and once plate shape qualified rate of an on-line quenched steel plate, simplifies a thermal refining technology flow of 12MnNiVR, and finally raises economic benefit of enterprises.

Description

technical field [0001] The invention relates to an on-line quenching and shape control process for 12MnNiVR steel plates, in particular to an on-line quenching and shape control process for 12MnNiVR steel plates based on inclined jet flow technology. Background technique [0002] As the key equipment for off-line quenching treatment of medium and heavy plates, the quenching machine provides an important platform for the production of high-quality, high-performance, high value-added medium and heavy plates. Since the 1990s, many domestic medium (thick) plate factories have successively introduced roller furnaces-quenching units from the German LOI company. When offline quenching is carried out based on a quenching machine, the steel plate needs to be shot blasted and reheated, which increases the cost of shot blasting and gas consumption. Compared with the reheating quenching process, the direct quenching process omits the reheating austenitization process, saves energy and ...

Claims

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Application Information

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Patent Type & Authority Applications(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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