Production method of hot-rolled structural steel for clad layer with yield strength of 460MPa

A technology of yield strength and production method, applied in the field of steel plate manufacturing, can solve problems such as ineffective effect, complicated galvanizing process, and increased galvanizing cost

Inactive Publication Date: 2010-01-13
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Practice has proved that its effect is not obvious. In addition, the use of these measures also bring

Method used

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  • Production method of hot-rolled structural steel for clad layer with yield strength of 460MPa

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Steel plate thickness: 5mm

[0071] (1) Steelmaking

[0072] The weight percentage of chemical composition is: C: 0.05%; Si: 0.04%; Mn: 1.42%; P: 0.014%; S: 0.005%; ALs: 0.047%; Nb: 0.051%; .

[0073] Indexes to measure weldability: carbon equivalent Ceq of steel = 0.327, grain sensitivity coefficient Pcm = 0.162.

[0074] (2) Hot rolling

[0075] Slab heating temperature: 1200°C

[0076] Rough rolling exit temperature: 1080°C

[0077] Finishing temperature: 850°C

[0078] Coiling temperature: 600°C

[0079] The product has high strength and good toughness. Yield strength: 520MPa; tensile strength: 575MPa; elongation: 23%; 180 ° cold bending d = 2a intact.

[0080] Galvanizing performance: After the steel plate is hot-dip galvanized, the coating is bright, the color is uniform, and it does not turn black.

Embodiment 2

[0082] Steel plate thickness: 7mm

[0083] (1) Steelmaking

[0084] The weight percentage of chemical composition is: C: 0.10%; Si 0.014%; Mn: 1.30%; P: 0.015%; S: 0.004%; ALs: 0.045%; Nb: 0.035%;

[0085] Indexes to measure weldability: carbon equivalent Ceq of steel = 0.306%; crack sensitivity coefficient Pcm = 0.140.

[0086] (2) Hot rolling

[0087] Slab heating temperature: 1240°C

[0088] Rough rolling exit temperature: 1080°C

[0089] Finishing temperature: 840°C

[0090] Coiling temperature: 540°C

[0091] The product has high strength and good toughness. Yield strength: 510MPa; tensile strength: 595MPa; elongation: 25%; 180 ° cold bending d = 2a intact.

[0092] Galvanizing performance: After the steel plate is hot-dip galvanized, the coating is bright, the color is uniform, and it does not turn black.

Embodiment 3

[0094] Steel plate thickness: 10mm

[0095] (1) Steelmaking

[0096] The weight percentage of chemical composition is: C: 0.069%; Si 0.015%; Mn: 1.40%; P: 0.018%; S: 0.007%; ALs: 0.06%; Nb: 0.041%;

[0097] Indexes to measure weldability: carbon equivalent Ceq of steel = 0.302%; crack sensitivity coefficient Pcm = 0.140.

[0098] (2) Hot rolling

[0099] Slab heating temperature: 1220°C

[0100] Rough rolling exit temperature: 1060°C

[0101] Finishing temperature: 830°C

[0102] Coiling temperature: 600°C

[0103] The product has high strength and good toughness. Yield strength: 485MPa; Tensile strength: 555MPa; Elongation: 27%; -5°C impact energy Akv≥215J; 180°cold bending d=2a intact.

[0104]Galvanizing performance: After the steel plate is hot-dip galvanized, the coating is bright, the color is uniform, and it does not turn black.

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Abstract

A production method of hot-rolled structural steel for clad layer with a yield strength of 460MPa orderly comprises the steps of steel making, continuous casting, plate blank heating, hot continuous rolling and laminar flow cooling, and coiling. The production method is characterized in that the chemical ingredients by weight percent in the steel making process include 0.05-0.10% of C, at most 0.04% of Si, 1.30-1.65% of Mn, at most 0.030% of P, at least 0.012% of S, 0.01-0.06% of ALs, 0.035-0.060% of Nb, and balance of Fe and inevitable impurities. The product manufactured by the steel plate of the invention has good clad layer quality and uniform and consistent surface color, and the invention solves the problems that the steel plate produced using the prior method has poor galvanization quality, relatively low intensity and the like, and reduces production cost.

Description

technical field [0001] The invention relates to a method for manufacturing a steel plate. This steel plate is a production method of hot-rolled structural steel for coating with a yield strength of 460MPa. [0002] The steel plate is rolled under controlled rolling, and the thickness of the steel plate ranges from 4.5mm to 16mm. This kind of steel plate is mainly used in engineering structural parts such as hot-dip galvanized steel plate towers for electric power, communication and urban lighting. The steel plate has good hot-dip coating performance, and can obtain good coating quality without changing the galvanizing process, without changing the composition of the zinc solution, without pre-plating metal Ni, etc. Good welding performance can be obtained by welding; the steel plate also has high strength, fine grain, excellent low temperature toughness, cold bending formability, the yield strength of the steel plate is above 460MPa, the tensile strength is above 550MPa, and...

Claims

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Application Information

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IPC IPC(8): B21C37/02C22C38/12B21B1/22B21B37/74C21D8/02
Inventor 郑鸿道彭涛周一中柳志敏黄治军苏毅杜明林承江王安军
Owner WUHAN IRON & STEEL (GROUP) CORP
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