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Welding process of ultrahigh-strength precipitated hardened stainless steel

A precipitation hardening, ultra-high-strength technology, used in welding equipment, welding media, welding equipment, etc., can solve the problems of poor welding quality and low strength of stainless steel, and achieve the effect of stable welding quality, high strength, and convenient welding or processing.

Active Publication Date: 2019-10-01
ANHUI MASTEEL ENG & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low strength and poor welding quality of stainless steel in the prior art, the present invention provides a welding process for ultra-high strength precipitation hardening stainless steel

Method used

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  • Welding process of ultrahigh-strength precipitated hardened stainless steel
  • Welding process of ultrahigh-strength precipitated hardened stainless steel
  • Welding process of ultrahigh-strength precipitated hardened stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A welding process for ultra-high-strength precipitation-hardening stainless steel, comprising the steps of:

[0044] (1) Analyze the chemical and mechanical indicators of the welded stainless steel base material and select the welding method; select the welding method according to the analysis of the stainless steel base material, so that the entire welding process is smooth and the welding quality is guaranteed to be good;

[0045] (2) Design of joint bevel; Figure 5 As shown, specifically, the groove angle in the joint groove is 60±2.5°, the butt gap is 2mm, and the single-sided "V" groove setting is adopted without blunt edges, which ensures that the stainless steel base metal can be fully welded when welding , which is convenient for machining and effectively improves the welding quality;

[0046] (3) pre-welding cleaning preparation; preferably, the step (3) includes the following steps:

[0047] (3.1) Clean up impurities: remove the oil and water within 20mm on...

Embodiment 2

[0059] Basically the same as Example 1. In this example, take a stainless steel pressure vessel of a large chemical plant as an example. The material of the stainless steel vessel is 0Cr17Ni7Al, the operating temperature is 200°C, and the wall thickness is δ12; the welding process for the material 0Cr17Ni7Al is as follows:

[0060] (1) Analyze the chemical and mechanical indicators of the welded stainless steel base material and select the welding method; the chemical composition of the 0Cr17Ni7Al base material is shown in Table 1 below, and the mechanical properties of the 0Cr17Ni7Al base material are shown in Table 2 below:

[0061] Table 1 Chemical composition of 0Cr17Ni7Al (%)

[0062] C Si mn S P 0.07-0.10 ≤0.5 0.5-1.0 ≤0.03 ≤0.035 Cr Ni Mo N Al 16.0-18.0 6.5-7.5 0.2-0.3 0.04-0.08 0.75-1.2

[0063] Table 2 Mechanical properties of 0Cr17Ni7Al

[0064] σ0.2(MPa) σb(MPa) δ(%) HRC Ak(J / cm2) ≥1276 ≥1379 ≥9 ...

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Abstract

The invention discloses a welding process of ultrahigh-strength precipitated hardened stainless steel, and belongs to the field of chemical machinery. Aiming at the problems that the strength of stainless steel is low and the welding quality is poor in the prior art, the welding process of the ultrahigh-strength precipitation hardened stainless steel is provided. The welding process comprises thefollowing steps that index analysis is carried out on a welded stainless steel base material, and a welding method is selected; a joint groove is designed; preweld cleaning and preparation work is carried out; a welding material is selected according to whether the performance of the welding seam is required to be matched with the performance of the base material or not; solid solution treatment is carried out on the stainless steel base material, and welding is carried out when the stainless steel base material in a solid solution state; and heat treatment is carried out on the stainless steel base material after welding. According to the welding process of ultrahigh-strength precipitated hardened stainless steel, the stainless steel is subjected to the solid solution treatment, and the stainless steel is welded in the solid solution state, so that the welding process is smooth, the welding quality is stable, and welding hot cracks are reduced; and the heat treatment is carried out after welding is completed, so that the tensile strength of the stainless steel is improved to 1100 MPa or above, and the stainless steel has relatively high strength, toughness and plasticity.

Description

technical field [0001] The invention belongs to the field of chemical machinery, and more specifically relates to a welding process of ultra-high-strength precipitation-hardening stainless steel. Background technique [0002] In the field of pressure vessel manufacturing, especially large-scale chemical plants and synthetic ammonia industries, stainless steel vessels are often used. Stainless steel is widely used due to its high strength and good corrosion resistance. Currently commonly used stainless steel is divided into ferritic stainless steel, austenitic stainless steel and martensitic stainless steel. In the chemical industry, due to the increase in the use temperature of the product, it is necessary to replace it with heat-resistant high-strength stainless steel. The tensile strength of the high-strength steel must reach at least 1100Mpa. Austenitic stainless steel and ferritic stainless steel have better corrosion resistance, but the strength cannot be adjusted by h...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/32B23K35/02B08B3/08C21D9/50C21D1/18B23K103/04
CPCB08B3/08B23K9/167B23K9/32B23K35/0261B23K2103/05C21D1/18C21D9/505
Inventor 张汪林秦红星危木建夏士军吴志华
Owner ANHUI MASTEEL ENG & TECH GRP
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