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Composite LP steel plate and production method thereof

A production method and steel plate technology, which is applied in the field of metallurgy, can solve the problems of steel plate corrosion resistance, poor aesthetics, low strength and toughness of composite plate substrates, and inability to meet the new needs of bridge steel construction, and achieve excellent mechanical properties and production technology. simple effect

Inactive Publication Date: 2018-08-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1) The corrosion resistance and aesthetics of the steel plate are poor, which cannot meet the new needs of bridge steel construction;
[0011] 2) The strength and toughness of the composite plate base plate are low, which cannot meet the requirements of high strength and toughness

Method used

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  • Composite LP steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the stainless steel cladding plate 2 is made of 304 stainless steel billet, and the carbon steel substrate 1 is made of Q345B steel billet.

[0035] One surface of the 304 stainless steel billet and one surface of the Q345B billet are respectively milled and ground by a milling machine, and the surface roughness after milling is Ra≤10um.

[0036] The milling and grinding surfaces of the Q345B steel billet and the 304 stainless steel billet are stacked together, and sent into a vacuum chamber to weld the surroundings of the contact surface to prevent oxidation of the contact surface during heating.

[0037] The wedge-shaped LP clad steel plate is rolled on a thick plate mill with the function of dynamically adjusting the roll gap, and the rolling start temperature is 1100°C.

[0038] The finished product is inspected and inspected, the thickness of the thin end is 20mm, the thickness of the thick end is 40mm, the length is 12m, and the shear strength ...

Embodiment 2

[0040] In this embodiment, the stainless steel cladding plate 2 is made of 316 stainless steel plate, and the carbon steel substrate 1 is made of Q345GJ steel plate.

[0041] One surface of the 316 stainless steel plate and one surface of the Q345GJ steel plate are respectively milled with a milling machine, and the surface roughness after milling is Ra≤10um.

[0042] The milling and grinding surfaces of Q345GJ steel plate and 316 stainless steel plate are stacked together, and sent into a vacuum chamber to weld the surroundings of the contact surface to prevent oxidation of the contact surface during heating.

[0043] The wedge-shaped LP clad steel plate was rolled on a thick plate mill with the function of dynamically adjusting the roll gap, and the rolling temperature was 1200 °C.

[0044] The finished product is inspected and inspected, the thickness of the thin end is 15mm, the thickness of the thick end is 30mm, the length is 20m, and the shear strength is ≥330Mpa.

Embodiment 3

[0046] In this embodiment, the stainless steel cladding plate 2 is made of 316L stainless steel plate, and the carbon steel substrate 1 is made of Q370q steel plate.

[0047] One surface of the 316L stainless steel plate and one surface of the Q370q steel plate are respectively milled by a milling machine, and the surface roughness after milling is Ra≤9um.

[0048] The milling and grinding surfaces of Q370q steel plate and 316L stainless steel plate are stacked together, and sent into a vacuum chamber to weld the surroundings of the contact surface to prevent oxidation of the contact surface during heating.

[0049] The wedge-shaped LP clad steel plate was rolled on a heavy plate mill with the function of dynamically adjusting the roll gap, and the rolling start temperature was 1150 °C.

[0050] The finished product is inspected and inspected, the thickness of the thin end is 30mm, the thickness of the thick end is 50mm, the length is 15m, and the shear strength is ≥310Mpa.

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Abstract

The invention relates to a composite LP steel plate and a production method thereof. The composite LP steel plate is formed by a carbon steel base plate and a stainless steel compound plate through combining and rolling forming. The thickness of the longitudinal cross section of the composite LP steel plate continuously changes. The shear strength of a finished product is greater than or equal to300 Mpa. The production method comprises the steps that (1) one surface of the carbon steel base plate and one surface of the stainless steel compound plate are subjected to milling and grinding treatment correspondingly; (2) the milling and grinding surfaces of the carbon steel base plate and the stainless steel compound plate are oppositely overlapped, and the four sides of the contact surfacesare welded to form a rolling blank in a vacuum chamber; (3) the welded rolling blank is rolled in a medium plate rolling mill with a weld seam dynamic adjustment function to obtain the composite LP steel plate. The composite LP steel plate produced through the method is manufactured from the compound plate with the high surface corrosion resistance and the aesthetic property and the base plate with high strength and high toughness. The composite LP steel plate is simple in production process. The mechanical performance of the combined interface of a finished product is excellent. The shear strength of the composite LP steel plate reaches up to 300 Mpa or above. The composite LP steel plate is an ideal structural steel plate.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a composite LP steel plate and a production method thereof. Background technique [0002] Steel for construction, bridge engineering and other engineering structures is an important engineering material. With the development of society and economy, bridge steel not only requires load-bearing and earthquake resistance, but also has higher and higher requirements for corrosion resistance and aesthetics; therefore, At present, engineering projects generally require structural steel not only to have excellent strength and toughness, good weldability, and low yield ratio to ensure the fracture resistance of bridges under heavy loads, but also to have good atmospheric corrosion resistance. It achieves the effect of avoiding painting, improving the service life and aesthetics of the bridge, so the stainless steel composite plate has gradually become the development trend of bridge en...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B15/00
CPCB21B1/38B21B15/00B21B2001/386
Inventor 李文斌刘明王华乔馨李新玲陈军平隋轶李云杨军
Owner ANGANG STEEL CO LTD