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9Ni steel and stainless steel composite steel plate for LNG storage tank and movable vessel and manufacturing method of composite steel plate

A composite steel plate and manufacturing method technology, applied in the field of hot-rolled steel plate production, can solve the problems of easy rusting of steel plate, easy magnetization of 9Ni steel plate, etc.

Active Publication Date: 2016-06-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the high-temperature oxide scale is formed, it is difficult to remove it during the rolling process.
[0010] 2) 9Ni steel plate is easy to magnetize
[0012] 3) 9Ni steel plate is easy to rust, especially after being drenched with water on the surface of the steel plate, such as ultrasonic flaw detection, etc.
So far, there is no precedent for making 9Ni steel / austenitic stainless steel composite steel plate to design and manufacture LNG containers and storage tanks by utilizing the respective advantages of 9Ni steel and austenitic stainless steel

Method used

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  • 9Ni steel and stainless steel composite steel plate for LNG storage tank and movable vessel and manufacturing method of composite steel plate
  • 9Ni steel and stainless steel composite steel plate for LNG storage tank and movable vessel and manufacturing method of composite steel plate
  • 9Ni steel and stainless steel composite steel plate for LNG storage tank and movable vessel and manufacturing method of composite steel plate

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Experimental program
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Effect test

Embodiment 1

[0078]In the prior art, the 160,000 m3 LNG storage tank inner tank wall is made of a 27mm thick simple 9Ni steel plate, and the selected grade is 06Ni9DR in GB3531-2014. The steel plate of this grade requires the average Charpy impact energy at -196°C to be ≥100J, the impact energy of a single sample should be ≥80J, the cold bending test (3a) is qualified, the tensile strength of the steel plate should be between 680-820MPa, and the yield strength should be ≥560MPa. Elongation after breaking ≥ 18%.

[0079] In this embodiment, a 160,000-cubic-meter LNG tank inner tank is designed with a 3-layer composite steel plate of stainless steel / 9Ni steel / stainless steel used for the first wall plate.

[0080] In this embodiment, the first ring wall plate of the 160,000 m3 LNG storage tank inner tank will be designed as a 27mm thick stainless steel / 9Ni steel / stainless steel 3-layer composite steel plate, such as figure 1 As shown, among them, the thickness t1 of the 9Ni steel base layer...

Embodiment 2

[0106] In the prior art, a certain type of vehicle-mounted mobile LNG container was originally designed to use pure 9Ni steel plates with a thickness of 8mm, and the selected brand was X8Ni9 in EN10028-4. The steel plate of this grade requires that the transverse Charpy impact energy (converted into a 10×10mm impact specimen) at -196°C should be ≥100J on average, and the impact energy of a single specimen should be ≥80J. The strength should be between 680 and 820MPa, the yield strength should be ≤585MPa, and the elongation after fracture should be ≤18%.

[0107] In this embodiment, this type of vehicle-mounted mobile LNG container will be designed to adopt a 3-layer composite steel plate with a thickness of 8mm stainless steel / 9Ni steel / stainless steel, such as figure 1 As shown, among them, the thickness t1 of the 9Ni steel base layer 1 is 7 mm, and the material is X8Ni9 in EN10028-4; the thickness t2 of the stainless steel cladding layer 2 is 0.5 mm, and the material is aust...

Embodiment 3

[0131] In the prior art, a certain type of vehicle-mounted mobile LNG container was originally designed to use a 5mm thick pure 9Ni steel plate, and the selected brand was X8Ni9 in EN10028-4. The steel plate of this grade requires that the transverse Charpy impact energy (converted into a 10×10mm impact specimen) at -196°C should be ≥100J on average, and the impact energy of a single specimen should be ≥80J. The strength should be between 680 and 820MPa, the yield strength should be ≥585MPa, and the elongation after fracture should be ≥18%.

[0132] In this embodiment, this type of vehicle-mounted mobile LNG container will be designed to adopt a 2-layer composite steel plate of 9Ni steel / stainless steel with a thickness of 5mm, such as image 3 As shown, among them, the thickness t1 of the 9Ni steel base layer 1 is 4.5 mm, and the material is X8Ni9 in EN10028-4; the thickness t2 of the stainless steel cladding layer 2 is 0.5 mm, and the material is austenitic stainless steel S...

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Abstract

The invention relates to a 9Ni steel and stainless steel composite steel plate for an LNG storage tank and a movable vessel and a manufacturing method of the composite steel plate. The composite steel plate comprises a substrate and multiple layers which cover at least one surface of the substrate, the substrate is made of 9Ni steel, and the multiple layers are made of Austenite stainless steel. The composite steel plate is obtained through blank surface treatment, seaming, heating, cooling, rolling and a heat treatment technology, the shear strength of a compound interface is larger than or equal to 210 MPa, -196 DEG C lower-temperature Charpy impact energy is larger than or equal to 100 J, the tensile strength ranges from 680 MPa to 820 MPa, the yield strength is larger than or equal to 50 MPa, the elongation is larger than or equal to 18%, and the remanence strength is smaller than or equal to 30 gauss.

Description

technical field [0001] The invention relates to the production technology of hot-rolled steel plates, in particular to a 9Ni steel / stainless steel composite steel plate for LNG storage tanks and mobile containers and a manufacturing method thereof. Background technique [0002] Natural gas, including conventional natural gas, shale gas and future seabed combustible ice, is favored by the world's energy-consuming countries because of its huge reserves, relatively clean and environmentally friendly. Correspondingly, my country's natural gas demand is also rising sharply. By 2013, my country's apparent consumption of natural gas has reached 165 billion cubic meters, and imported natural gas has reached about 53 billion cubic meters. It is estimated that by the end of 2015, my country's natural gas supply will reach 268 billion cubic meters, including domestic resources of 194 billion cubic meters and imports of 74 billion cubic meters; in 2020, natural gas supply will reach 431...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01B32B15/18B23P15/00
CPCB23P15/00B32B15/011B32B2250/03B32B2250/40B32B2307/54
Inventor 陈超李占杰张汉谦闵秉栋沈剑
Owner BAOSHAN IRON & STEEL CO LTD
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