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550MPa-grade steel plate and manufacturing method of 550MPa-grade steel plate

A manufacturing method and technology for steel plates, applied in the field of manufacturing 550MPa grade steel plates and 550MPa grade steel plates, can solve the problems affecting the reputation of steel mills, difficult control of plate shape and cooling uniformity, and fast cooling rate.

Active Publication Date: 2018-11-06
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of Q550D steel plate, the requirements for controlled rolling and controlled cooling process are relatively strict, especially in the controlled rolling and controlled cooling stages, the rolling temperature is low, the steel plate strength is high, the final cooling temperature is low, the cooling intensity is high, and the cooling rate is fast. The control of uniformity of shape and cooling brings difficulties, especially the shape defects, which cannot be completely eliminated by hot straightening machines, cold straightening machines, and flattening machines, resulting in the failure of steel plates to be delivered according to standards and customer requirements, affecting Steel Mill's Reputation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] According to the 550MPa grade steel plate of the embodiment of the present invention, its chemical composition is: C: 0.08-0.1%, Si: 0.25-0.35%, Mn: 1.78-1.88%, P: 0-0.015%, S : 0-0.005%, Als: 0.017-0.027%, Cr: 0.23-0.33%, V: 0.05-0.07%, Nb: 0.05-0.06%, Ca: 0.001-0.0025%, Ti: 0.01-0.02%, and the rest Iron and unavoidable impurities.

[0015] The 550MPa grade steel plate adds a small amount of expensive alloying elements such as Nb, V, Ti, etc., the production cost is low, and the machinability is good.

Embodiment 2

[0017] The manufacturing method of the 50MPa grade steel plate according to the embodiment of the present invention includes: step 1, heating process: heating the slab in a walking heating furnace, the temperature of the continuous casting slab out of the furnace is 1210-1250°C, and the heating time is 200-400 Minutes; step 2, rolling process: if the thickness of the steel plate is 10mm to 30mm, then the controlled rolling is carried out after the heating process is completed, the first stage rolling is completed in a four-roll reversible roughing mill, and the thickness of the starting rolling is the thickness of the slab, The rolling temperature of the first stage is 1190~1230℃, the rolling speed of the first stage is 1m / s, and the reduction rate of single pass in the first stage of high temperature elongation rolling is ≥10%; the second stage is rolled in a four-roll reversible The finish rolling mill is completed, the thickness of the second-stage rolling of the steel plate...

Embodiment 3

[0020] The thickness of the steel plate is 16mm, the steel type is Q550D, the chemical composition of the steel is: C: 0.088, Si: 0.27, Mn: 1.85, P: 0.009, S: 0.004, Als: 0.021, Cr: 0.283, V: 0.062, Nb: 0.058, Ca: 0.0019, Ti: 0.017; the rest are iron and unavoidable impurities. The thickness of the slab is 250mm, the heating temperature is 1228°C, the heating time is 297 minutes, the rolling start temperature is 1202°C in the rough rolling stage, the rolling speed is 1m / s, the reduction rate in the high temperature extension stage is 11-24%; the finishing rolling stage The starting rolling thickness is 48mm, the starting rolling temperature is 998°C, the finishing rolling temperature is 897°C, the effective rolling pass is 6 passes, and the reduction amount in the 6th pass of finishing rolling is limited to 2mm, and the final cooling of ACC is set to 570°C, the cooling rate is 21K / S, the cooling strategy calculated by the ACC model is: the water volume of the upper spray beam ...

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PUM

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Abstract

The invention provides a 550MPa-grade steel plate and a manufacturing method of the 550MPa-grade steel plate. The 550MPa-grade steel plate is prepared from the chemical components of, by mass, 0.08 to0.1 percent of C, 0.25 to 0.35 percent of Si, 1.78 to 1.88 percent of Mn, 0 to 0.015 percent of P, 0 to 0.005 percent of S, 0.017 to 0.027 percent of Als, 0.23 to 0.33 percent of Cr, 0.05 to 0.07 percent of V, 0.05 to 0.06 percent of Nb, 0.001 to 0.0025 percent of Ca, 0.01 to 0.02 percent of Ti, and the balance iron and inevitable impurities. Through the technical scheme provided by the invention, the 550MPa-grade steel plate is added with a small number of valuable alloy elements such as Nb, V and Ti, so that the production cost is low, and the machinability is favorable.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a 550MPa grade steel plate and a manufacturing method for the 550MPa grade steel plate. Background technique [0002] In the production process of Q550D steel plate, the requirements for controlled rolling and controlled cooling process are relatively strict, especially in the controlled rolling and controlled cooling stages, the rolling temperature is low, the steel plate strength is high, the final cooling temperature is low, the cooling intensity is high, and the cooling rate is fast. The control of uniformity of shape and cooling brings difficulties, especially the shape defects, which cannot be completely eliminated by hot straightening machines, cold straightening machines, and flattening machines, resulting in the failure of steel plates to be delivered according to standards and customer requirements, affecting reputation of the mill. Contents of the invention [00...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/38C22C38/46C22C38/48C22C38/50C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/002C22C38/02C22C38/06C22C38/38C22C38/46C22C38/48C22C38/50
Inventor 赵超李浩温利军高军张满全徐晓明程刚王遐亮任春米升
Owner BAOTOU IRON & STEEL GRP