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Biphase alloy steel tank container seal head and preparation technology thereof

A technology for alloy steel and tank containers, which is applied in the field of dual-phase alloy steel tank container heads and its preparation process, which can solve the problems of low strength and achieve low hot cracking tendency, good chloride stress corrosion resistance, and weldability good effect

Active Publication Date: 2013-06-26
YIXING HOKKAI HEAD PLATE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low, it is impossible to strengthen it through phase transformation, and it can only be strengthened by cold working

Method used

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  • Biphase alloy steel tank container seal head and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The dual-phase alloy steel plate of this embodiment has a thickness of 6mm and a width of 1800mm, and its chemical composition mass percentage is: C:

[0033] 0.027%, Si: 0.87%, Mn: 1.90%, Cr: 21%, Ni: 6.00%, N: 0.16%, Mo: 3.20%, P: 0.025%, S: 0.015%, the rest is Fe and not Avoid impurities.

[0034] A process for preparing a dual-phase alloy steel tank head, comprising the steps of:

[0035] (1) Circle cutting: Draw on the steel plate according to the shape of the drawing, adjust the knife distance, use plasma cutting, and transfer after confirming that there are no sundries;

[0036] (2) Welding: Place the wafer on the working platform of the plasma welding machine, spot-fix the weld, and then perform welding. The weld is formed on one side and double-sided, and the weld must not be lower than the base material; the surface must not have cracks, pores, Defects such as arc craters, undercuts and slag inclusions, and no slag and spatter. The welds are ground on both ...

Embodiment 2

[0053] The dual-phase alloy steel plate in this example has a thickness of 6mm and a width of 1600mm, and its chemical composition mass percentages are: C: 0.009%, Si: 0.70%, Mn: 1.50%, Cr: 22.00%, Ni: 5.00%, N: 0.18%, Mo: 3.00%, P: 0.022%, S: 0.011%, and the rest are Fe and unavoidable impurities.

[0054] The preparation method of this embodiment is as described in Example 1.

Embodiment 3

[0056] The dual-phase alloy steel plate in this example has a thickness of 10mm and a width of 1800mm, and its chemical composition mass percentages are: C: 0.022%, Si: 0.56%, Mn: 0.45%, Cr: 22.5%, Ni: 4.67%, N: 0.14%, Mo: 3.30%, P: 0.008%, S: 0.014%, and the rest are Fe and unavoidable impurities.

[0057] The preparation method of this embodiment is as described in Example 1.

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Abstract

The invention discloses a biphase alloy steel tank container seal head and a preparation technology thereof. The seal head is characterized in that the biphase alloy steel comprises the following components in percentage by mass: less than 0.030% of C, less than 1.00% of Si, less than 2.00% of Mn, 21.00-23.00% of Cr, 4.50-6.50% of Ni, 0.14-0.20% of N, 3.00-3.50% of Mo, less than 0.030% of P, less than 0.020% of S and the balance of Fe and inevitable impurities. The biphase alloy steel tank container seal head has the characteristics of good chloride stress corrosion resistance under low stress, good hole corrosion resistance, good corrosion fatigue resistance and erosion corrosion resistance, good comprehensive mechanical property, good weldability, small heat crack tendency and no preheating before the welding and thermal treatment after the welding, can be welded with heterogeneities such as austenitic stainless steel or carbon steel.

Description

technical field [0001] The invention relates to a head, in particular to a dual-phase alloy steel tank head and a preparation process thereof. Background technique [0002] The material used for the existing tank head is mostly austenitic stainless steel. Austenitic stainless steel came out in Germany in 1913 and has always played the most important role in stainless steel. Its production and usage account for about 70% of stainless steel production and usage. Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. When the steel contains about 18% Cr, Ni8%-10%, and C about 0.1%, it has a stable austenitic structure. Austenitic chromium-nickel stainless steel includes the famous 18Cr-8Ni steel and the high Cr-Ni series steel developed on the basis of increasing Cr and Ni content and adding Mo, Cu, Si, Nb, Ti and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is l...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/44B23P15/00
Inventor 王华陈建东张斌峰高艳华张立群
Owner YIXING HOKKAI HEAD PLATE
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