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Preparation method for LNG storage tank flange stainless steel

A technology of stainless steel and flanges, applied in the field of hot-rolled steel, to achieve the effects of excellent mechanical properties, good anti-rust and anti-magnetization capabilities

Inactive Publication Date: 2019-04-09
JIANGYIN HENGRUN RING FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defects in the prior art, and provide a kind of high-temperature oxide scale formed on the slab during the heating and rolling process, which is easy to be completely removed by high-pressure water descaling, etc., so that the surface of the finished steel No defects such as warped skin and hemp pits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The technical proposal of the present invention is to design a kind of preparation method that is used for LNG storage tank flange stainless steel, and described steel is 316L stainless steel, comprises the following components by mass percentage: containing ≤0.04% C, containing 0.3% Si, containing 0.8% Mn, 14% Cr, 9% Ni, 1.5% Mo, 0.01%, 0.010% P, 0.10% N, the balance being Fe and unavoidable impurities;

[0041] Described stainless steel is prepared by following method:

[0042] (1) Add silicon and manganese to raw steel and deoxidize at 1650°C;

[0043] (2) adding chromium and nickel elements by the mass percentage at the above-mentioned temperature;

[0044] (3) Sampling at the above temperature for material composition analysis and adjustment, so that the mass percentage of each element is within the stated range;

[0045] (4) be heated up to 1720 ℃, remove slag;

[0046] (5) Pouring the molten steel after slag removal to obtain a billet, which is quenched and te...

Embodiment 2

[0063] The technical solution of the present invention also has a preparation method for LNG storage tank flange stainless steel, the steel is 316L stainless steel, including the following components in mass percentage: containing ≤0.04% of C, containing 0.4% of Si, containing 0.9% % Mn, containing 15% Cr, containing 9% Ni, containing 1.7% Mo, containing 0.015% S, containing 0.020% P, containing 0.12% N, and the balance is Fe and unavoidable impurities;

[0064] Described stainless steel is prepared by following method:

[0065] (1) Add silicon and manganese to raw steel and deoxidize at 1665°C;

[0066] (2) adding chromium and nickel elements by the mass percentage at the above-mentioned temperature;

[0067] (3) Sampling at the above temperature for material composition analysis and adjustment, so that the mass percentage of each element is within the stated range;

[0068] (4) be heated up to 1725 ℃, remove slag;

[0069] (5) Pouring the molten steel after slag removal t...

Embodiment 3

[0086] The technical solution of the present invention also has a preparation method for LNG storage tank flange stainless steel, the steel is 316L stainless steel, including the following components in mass percentage: containing ≤0.04% of C, containing 0.50% of Si, containing 1.0% % Mn, containing 17% Cr, containing 10% Ni, containing 2% Mo, containing 0.02% S, containing 0.031% P, containing 0.13% N, and the balance is Fe and unavoidable impurities;

[0087] Described stainless steel is prepared by following method:

[0088] (1) Add silicon and manganese to raw steel and deoxidize at 1680°C;

[0089] (2) adding chromium and nickel elements by the mass percentage at the above-mentioned temperature;

[0090] (3) Sampling at the above temperature for material composition analysis and adjustment, so that the mass percentage of each element is within the stated range;

[0091] (4) be heated up to 1730 ℃, remove slag;

[0092] (5) Pouring the molten steel after slag removal to...

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Abstract

The invention discloses a preparation method for the LNG storage tank flange stainless steel. The steel is 316L stainless steel and comprises C, Si, Mn, Cr, Ni and Mo, S, P, N and the balance of Fe and inevitable impurities; the stainless steel is prepared by the following method of adding Si and Mn into the raw steel, adding Cr and Ni according to the mass percentage at the temperature; samplingat the temperature and analyzing and adjusting the material components, so that the mass percent of each elements are within the range; removing slag; pouring the slag-removed molten steel to obtain ablank, cooling and tempering the blank; only one annealing step is added before quenching and tempering, the hardness of the stainless steel is 265-351 HV0.1, the magnetic permeability is that the magnetism is less than or equal to 5 nT in 0. 1m, the magnetic permeability is less than or equal to 1. 3H / m, corrosion resistance is that the salt fog test is not rusty after 24 hours.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel, in particular to a method for preparing stainless steel used for flanges of LNG storage tanks. 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 2025, my country's natural gas supply will reach 368 billion cubic meters, including 294 billion cubic meters of domestic resources and 74 billion cubic meters of imports; in 2030, the natural gas supply will reach 531 billion cubic meters, including 370 billion cubic meters of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D1/26C21D1/18C21D6/00C22C33/04C22C38/02C22C38/04C22C38/44
CPCC21D1/18C21D1/25C21D1/26C21D6/004C21D6/005C21D6/008C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/44
Inventor 承天洋承刚张少云张庆陈致远汪凯顾嘉琦
Owner JIANGYIN HENGRUN RING FORGING