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A kind of production method of extra-thick 15mnni steel plate

A production method and thick steel plate technology, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of extended delivery time, high production cost, and difficult control of plate shape, so as to reduce production cost and shorten production Cycle, the effect of improving market competitiveness

Active Publication Date: 2017-05-24
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the 15MnNi steel plate produced in China adopts quenching and tempering heat treatment process. For extra thick (thickness ≥ 90mm) varieties, when using quenching and tempering (quenching + tempering) heat treatment process, it needs to enter the heat treatment furnace twice. The problem that the plate shape is difficult to control, and the delivery time is extended, the production cost is also high, and it is urgent to improve

Method used

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  • A kind of production method of extra-thick 15mnni steel plate
  • A kind of production method of extra-thick 15mnni steel plate
  • A kind of production method of extra-thick 15mnni steel plate

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Effect test

Embodiment 1

[0013] A kind of production method of 90mm extra-thick 15MnNi steel plate of the present invention comprises several aspects of smelting composition control, blanking, rolling and heat treatment, and its specific parameter control is as follows:

[0014] 1) In the control of smelting composition, the chemical elements by weight percentage are: C 0.15%, Si 0.28%, Mn 1.5%, Ni0.8%, Cr0.20%, Ti 0.015%, V 0.014%;

[0015] 2) When blanking: the steel ingot is blanked under high temperature and high pressure to an intermediate billet with a thickness of 290mm, the rolling temperature is 1220°C, and the reduction rate is 12%;

[0016] 3) During rolling: the starting rolling temperature for the intermediate billet is 1020°C, and the reduction rate is 12%;

[0017] 4) In the heat treatment stage, the total time in the furnace and the holding temperature must be strictly controlled. Normalizing heat treatment is adopted, the holding temperature is 920°C, and the total time in the furnace...

Embodiment 2

[0022] A kind of production method of 100mm extra-thick 15MnNi steel plate of the present invention comprises several aspects of smelting composition control, blanking, rolling and heat treatment, and its specific parameter control is as follows:

[0023] 1) In the control of smelting composition, the chemical elements are C 0.18%, Si 0.35%, Mn 1.6%, Ni0.75%, Cr0.15%, Ti 0.012%, V 0.018% by weight percentage;

[0024] 2) When billeting: the steel ingot is billeted under high temperature and high pressure to an intermediate billet with a thickness of 300mm, the rolling temperature is 1210°C, and the reduction rate is 10%;

[0025] 3) During rolling: the starting rolling temperature for the intermediate billet is 1010°C, and the reduction rate is 11%;

[0026] 4) In the heat treatment stage, the total time in the furnace and the holding temperature must be strictly controlled. Normalizing heat treatment is adopted, the holding temperature is 930°C, and the total time in the furn...

Embodiment 3

[0031] A kind of production method of 120mm extra-thick 15MnNi steel plate of the present invention comprises several aspects of smelting composition control, blanking, rolling and heat treatment, and its specific parameter control is as follows:

[0032] 1) In the control of smelting composition, the chemical elements by weight percentage are: C 0.12%, Si 0.15%, Mn 1.25%, Ni0.59%, Cr0.25%, Ti 0.013%, V 0.015%;

[0033] 2) When blanking: the steel ingot is blanked under high temperature and high pressure to an intermediate billet with a thickness of 300mm, the rolling temperature is 1230°C, and the reduction rate is 11%;

[0034] 3) During rolling: the starting rolling temperature for the intermediate billet is 1030°C, and the reduction ratio is 13%;

[0035] 4) In the heat treatment stage, the total time in the furnace and the holding temperature must be strictly controlled. Normalizing heat treatment is adopted, the holding temperature is 930°C, and the total time in the fur...

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Abstract

The invention relates to the field of hot rolled strip processes, and particularly relates to a production method of super-thick 15NnNi steel plates. The method is characterized by comprising the following steps of: smelting composition control, breaking-down rolling and heat treatment, for a thick steel plate with a thickness of 90-120 mm, 1) in the step of smelting composition control, the following chemical elements in percentage by weight are adopted: 0.1-0.2% of C, 0.15-0.37% of Si, 1.15-1.7% of Mn, 0.5-0.9% of Ni, 0.15-0.25% of Cr, less than or equal to 0.02% of Ti, and less than or equal to 0.02% of V; 2) the thickness of breaking-down is 290-300 mm; 3) the rolling temperature is 1000 DEG C, and the reduction rate is greater than or equal to 10%; 4) the heat treatment is implemented by normalizing. Compared with the prior art, the method disclosed by the invention has the beneficial effects that because one operation of feeding the steel plate into a heat treatment furnace is omitted, the cost is significantly reduced, the production cycle is shortened, and the problem that the plate shape is difficult to control caused by a quenching process is avoided.

Description

technical field [0001] The invention relates to the technical field of hot-rolled strips, in particular to a production method of an extra-thick 15MnNi steel plate. Background technique [0002] At present, the 15MnNi steel plate produced in China adopts quenching and tempering heat treatment process. For extra thick (thickness ≥ 90mm) varieties, when using quenching and tempering (quenching + tempering) heat treatment process, it needs to enter the heat treatment furnace twice. The problem that the plate shape is difficult to control, and the delivery time is prolonged, the production cost is also high, and it is urgently needed to be improved. Contents of the invention [0003] The object of the present invention is to provide a kind of production method that reduces production cost, shortens production period, improves the 90~120mm extra-thick 15MnNi steel plate of plate shape quality. [0004] For realizing the above object, technical scheme of the present invention i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/50B21B37/16B21B37/74C21D1/28
Inventor 罗志华王若钢李新玲李靖年刘浩岩杨军张健张紫茵王动孙殿东
Owner ANGANG STEEL CO LTD